CN111290089A - Multi-wavelength coupling light emitting device - Google Patents

Abstract

The embodiment of the application provides a multi-wavelength coupling light emitting device, and relates to the technical field of optical instruments. The multi-wavelength coupling light emitting device comprises a collimating lens, a half-wave plate, a polarization beam combiner and a beam combiner, wherein the half-wave plate is used for deflecting a first polarized light signal group, and the first polarized light signal group at least comprises two beams of polarized light signals; the polarization beam combining mirror is arranged behind the half-wave plate, and the first polarization light signal group is incident to the first surface of the polarization beam combining mirror and reflected by the polarization beam combining mirror; the second polarized light signal group is incident to the second surface of the polarization beam combining mirror and is transmitted, and polarized light signals in the second polarized light signal group and polarized light signals in the first polarized light signal group are pairwise combined into a third polarized light signal group; the beam combiner is arranged in front of the first surface of the polarization beam combiner and used for combining and transmitting the polarized light signals in the third polarized light signal group. The multi-wavelength coupling light emitting device can achieve the technical effects of simplifying the structure of an optical path, achieving the process and reducing the wavelength-dependent loss.

Description

A multi-wavelength coupled light emitting device

technical field

The present application relates to the technical field of optical devices, and in particular, to a multi-wavelength coupled light emitting device.

Background technique

At present, the optical module is an important component of the modern optical communication network. It provides a Gbit high-speed data physical channel for the communication network, and the optical emitting device is the core component of the optical module. With the rapid construction and upgrade of the current data center network, data centers have put forward demands on optical modules such as multi-wavelength channels, high speed, small size, and low cost.

In the prior art, for data center applications, IEEE has defined four-wavelength and eight-wavelength-based LAN WDM and CWDM standards. For the multi-wavelength light emitting device, the dielectric thin film filter scheme is currently a commonly used multi-wavelength beam combining scheme, but the existing scheme still has some shortcomings and challenges, such as the inconsistent optical path of each wavelength, and the wavelength-dependent loss is obvious. For the eight-wavelength combined optical path structure, the size of the optical device is too large and so on.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present application is to provide a multi-wavelength coupled light emitting device, which can achieve the technical effects of simplifying the optical path structure and implementation process, and reducing wavelength-dependent loss.

An embodiment of the present application provides a multi-wavelength coupled light emitting device, including a half-wave plate, a polarization beam combiner, and a beam combiner, where the half-wave plate is used to deflect a first polarized light signal group, the first polarized light signal The group includes at least two beams of polarized light signals; the polarization beam combiner is arranged behind the half-wave plate, and the first group of polarized light signals is incident on the first surface of the polarization beam combiner and formed by the polarization beam combiner. Beam mirror reflection; the second polarized light signal group is incident on the second surface of the polarized beam combiner and transmitted, and the polarized light signal in the second polarized light signal group and the polarized light signal in the first polarized light signal group are two The two combined beams are a third polarized light signal group; the beam combiner is arranged in front of the first face of the polarized beam combiner, and is used for combining and transmitting the polarized light signals in the third polarized light signal group .

In the above implementation process, the multi-wavelength coupled light emitting device rotates the polarization state of the first polarized light signal group by 90° through a half-wave plate, and then uses the polarization beam combiner to combine the first polarized light signal group and the second polarized light signal group. The polarized light signal groups are combined into a third polarized light signal group, so that each group of polarized light signals after combining in the third polarized light signal group is orthogonal to each other, and finally the third polarized light signal is combined by a beam combiner. The combined beam of optical signals is a bundle of signals and is emitted; therefore, the multi-wavelength coupled optical emission device can combine the polarized optical signals into mutually orthogonal polarized optical signals through the polarization beam combiner, which can simplify the optical path structure and realize the technology, and the technical effect of reducing wavelength-dependent loss.

Further, the device further includes a first laser group and a first collimating lens group, the first laser group is arranged before the half-wave plate, and is used for emitting polarized light signals of the first polarized light signal group ; the first collimating lens group is arranged between the first laser group and the half-wave plate, and is used for collimating the polarized light signal of the first polarized light signal group.

In the above implementation process, the first laser group is used to generate and emit polarized light signals of the first polarized light signal group, and the first collimating lens group is used to collimate the polarized light signals of the first polarized light signal group.

Further, the device also includes a second laser group and a second collimating lens group, and the second laser group is arranged before the second surface of the polarization beam combiner for emitting the second polarization signal The second collimating lens group is arranged between the second laser group and the polarization beam combiner, and is used for collimating the polarized light signals of the second polarized light signal group.

In the above implementation process, the second laser group is used to generate and emit polarized light signals of the second polarized light signal group, and the second collimating lens group is used to collimate the polarized light signals of the second polarized light signal group.

Further, the beam combiner is a wavelength-division optical combiner, the wavelength-division optical combiner includes a plurality of input ends and an output end, and the input end of the wavelength-division optical combiner is connected to the third polarized optical signal. The polarized light signals of the group correspond one-to-one.

In the above implementation process, the wavelength division optical multiplexer uses the wavelength division multiplexing technology to combine two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end through the multiplexer, and couple to the A technology that transmits in the same fiber of an optical line.

Further, the device further includes a condensing lens, and the condensing lens is disposed behind the output end of the wavelength division optical combiner.

In the above implementation process, the condensing lens can further gather the optical signal after the combined beam of the third polarized optical signal, thereby improving the transmission efficiency of the optical signal.

Further, the beam combiner is a large clear aperture condensing lens.

In the above implementation process, the large clear aperture condensing lens can realize spatial beam combining of each optical signal in the third polarized optical signal group; compared with the wavelength division optical combiner, it has the problem of difficulty in debugging, but has the advantages of simple structure, The advantage of lower cost.

Further, the device further includes an optical fiber, the optical fiber is arranged after the beam combiner, and is used for transmitting the polarized light signal after the combined beam of the third polarized light signal.

In the above realization process, the optical fiber uses the transmission principle of "full emission of light". The fiber made of glass or plastic can be used as a light transmission tool. The advantages of high and reliable working performance.

Further, the device further includes an optical isolator, and the optical isolator is arranged between the optical fiber and the beam combiner.

In the above implementation process, the optical isolator is a passive optical device that allows only one-way light to pass through, and its working principle is based on the non-reciprocity of Faraday rotation. The light reflected by the optical fiber echo can be well isolated by the optical isolator, which improves the light wave transmission efficiency.

Further, the device further includes a circuit board, a first part of the circuit board is arranged before the second surface of the polarization beam combiner, and a second part of the circuit board is arranged before the half-wave plate.

In the above implementation process, the circuit board may be referred to as a printed circuit board or a printed circuit board, and provides electronic hardware support for the multi-wavelength coupled light emitting device.

Further, the device further includes a heat sink, the first part of the heat sink is disposed between the first part of the circuit board and the second surface of the polarization beam combiner, and the second part of the heat sink is disposed between the second portion of the circuit board and the half-wave plate.

In the above implementation process, the heat sink is a material with high thermal conductivity, such as metallic copper. Since the devices that generate optical signals (such as laser diodes, etc.) generate a lot of heat during operation, it is necessary to install the devices that generate optical signals on a heat sink to help dissipate heat, thereby stabilizing the operating temperature and improving the stability and safety of the device. sex.

Additional features and advantages of the present disclosure will be set forth in the description that follows, or some may be inferred or unambiguously determined from the description, or may be learned by practicing the above-described techniques of the present disclosure.

In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, therefore It should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic block diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application;

3 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the present application and its embodiments, and are not intended to limit the fact that the indicated device, element, or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

Furthermore, the terms "installed", "arranged", "provided", "connected", "connected" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection, or a point connection; it may be directly connected, or indirectly connected through an intermediate medium, or between two devices, elements or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and configurations may be the same or different), and are not used to indicate or imply the indicated devices, elements, etc. or the relative importance and number of components. Unless stated otherwise, "plurality" means two or more.

The embodiment of the present application provides a multi-wavelength coupled light emitting device, which can be applied to optical devices, such as for coupling and combining of multi-wavelength polarized light; the multi-wavelength coupled light emitting device uses a half-wave plate to make the first polarization The polarization state of the polarized light of the optical signal group is rotated by 90°, and then the first polarized light signal group and the second polarized light signal group are combined into a third polarized light signal group by a polarization beam combiner, so that the third polarized light signal group is combined. Each group of polarized light signals after beam combination in the signal group is orthogonal to each other, and finally the third polarized light signal is combined into a beam of signals through the beam combiner and emitted; The beam combiner can combine the polarized light signals into mutually orthogonal polarized light signals, which can achieve the technical effects of simplifying the structure of the optical path, realizing the process, and reducing the wavelength-dependent loss.

Please refer to FIG. 1 . FIG. 1 is a schematic block diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application. The multi-wavelength coupled light emitting device includes a half-wave plate 100 , a polarization beam combiner 200 and a beam combiner 300 .

Exemplarily, the half-wave plate 100 is used to deflect the first polarized light signal group, and the first polarized light signal group includes at least two polarized light signals.

Exemplarily, the half-wave plate 100 is a birefringent crystal with a certain thickness, when the normal incident light is transmitted, the phase difference between the ordinary light (o light) and the extraordinary light (e light) is equal to π or its odd multiples , such a wafer is called a half-wave plate, or a half-wave plate for short. In the multi-wavelength coupled light emitting device, the action of the half-wave plate rotates the polarization state of the first polarized light signal group by 90°.

Exemplarily, the polarization beam combiner 200 is disposed behind the half-wave plate 100, the first polarized light signal group is incident on the first surface of the polarization beam combiner 200 and is reflected by the polarization beam combiner 200; the second polarized light signal group is incident The polarized light signals in the second polarized light signal group and the polarized light signals in the first polarized light signal group are combined in pairs to form a third polarized light signal group.

Exemplarily, the first polarized light signal group and the second polarized light signal group have the same polarization state before entering the polarization beam combiner 200; the polarized light signal in the second polarized light signal group is the same as the first polarized light signal group. After the polarized light signals are combined into a third polarized light signal group, the polarization states of each pair of polarized light signals in the third polarized light signal group are orthogonal to each other due to the action of the half-wave plate.

Exemplarily, the polarizing beam combiner can also be called a polarizing beam splitter (PBS), and the polarizing beam combiner includes a thin film polarizer (Thin Film Polarizer), which can make one polarization state reflect, and the other can be reflected. One polarization state is transmitted, so that two beams of light with different polarizations coming from different directions can be combined.

Exemplarily, the beam combiner 300 is disposed in front of the first face of the polarization beam combiner mirror 200, and is used to combine and transmit the polarized light signals in the third polarized light signal group.

Exemplarily, the beam combiner 300 can combine the polarized light signals of the third polarized light signal group into one beam, thereby completing the beam combining of each polarized light signal in the first polarized light signal group and the second polarized light signal group. For a bunch of technical effects.

Optionally, the beam combiner 300 is a wavelength-division optical combiner, the wavelength-division optical combiner includes a plurality of input ends and an output end, and the input end of the wavelength-division optical combiner is the same as the polarized optical signal of the third polarized optical signal group. One-to-one correspondence.

Exemplarily, the wavelength division optical multiplexer uses the wavelength division multiplexing (WDM, Wavelength Division Multiplexing) technology to combine two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end through a multiplexer (also called a multiplexer). In other words, the wavelength division optical combiner can achieve the technical effect of simultaneously transmitting two or many optical signals of different wavelengths in the same optical fiber. .

Optionally, the multi-wavelength coupled light emitting device further includes a condensing lens, and the condensing lens is arranged after the output end of the wavelength division optical combiner.

Exemplarily, the condensing lens may further condense the optical signal after the third polarized optical signal combined beam, so as to improve the transmission efficiency of the optical signal.

Optionally, the beam combiner 300 is a large clear aperture condensing lens.

Exemplarily, the large clear aperture condensing lens can realize spatial beam combining of each optical signal in the third polarized optical signal group; compared with the wavelength division optical combiner, it has the problem of difficulty in debugging, but has the advantages of simple structure and relatively low cost. low advantage.

In some implementation scenarios, the multi-wavelength coupled light emitting device passes through the half-wave plate 100 to rotate the polarized light polarization state of the first polarized light signal group by 90°, and then passes the polarization beam combiner 200 to combine the first polarized light signal group with the polarized light signal group. The second polarized light signal groups are combined into a third polarized light signal group, so that each group of polarized light signals after combining in the third polarized light signal group is orthogonal to each other. The third combined beam of polarized light signals is one signal and is emitted; therefore, the multi-wavelength coupled light emitting device can combine the polarized light signals into mutually orthogonal polarized light signals through the polarization beam combiner, which can simplify the optical path Structure and realization process, technical effect of reducing wavelength-dependent loss.

和“●”表示偏振光信号的偏振态。Please refer to FIG. 2. FIG. 2 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application. The multi-wavelength coupled light emitting device includes a half-wave plate 100, a polarization beam combiner 200, and a wavelength-division photosynthesis device. Wave filter 310, condensing lens 311, first laser group 410, first collimating lens group 420, second laser group 510, second collimating lens group 520, optical fiber 600, optical isolator 700, circuit board 800 and thermal Shen 900, of which

And "•" indicates the polarization state of the polarized light signal.

Among them, the half-wave plate 100 , the polarization beam combiner 200 , the wavelength division optical combiner 310 and the condensing lens 311 have been described above, and in order to avoid repetition, they will not be repeated here.

Exemplarily, the first laser group 410 and the first collimating lens group 420, wherein the first laser group 410 is arranged before the half-wave plate 100, is used to transmit the polarized light signal of the first polarized light signal group; the first collimation The lens group 420 is disposed between the first laser group 410 and the half-wave plate 100 for collimating the polarized light signals of the first polarized light signal group.

Exemplarily, the second laser group 510 and the second collimating lens group 520, wherein the second laser group 510 is disposed before the second surface of the polarization beam combiner 200, and is used to transmit the second polarization signal group; The straight lens group 520 is disposed between the second laser group 510 and the polarization beam combiner 200, and is used for collimating the polarized light signals of the second polarized light signal group.

Exemplarily, the lasers in the above-mentioned laser group may be semiconductor lasers. A semiconductor laser, also known as a laser diode (LD), is a laser that uses a semiconductor material as a working substance. Due to the differences in the material structure, the specific processes of different types of lasers are special. Commonly used working substances are gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), etc. There are three types of excitation methods: electric injection, electron beam excitation and optical pumping. Semiconductor laser devices can be divided into homojunction, single heterojunction, and double heterojunction. Homojunction lasers and single heterojunction lasers are mostly pulsed devices at room temperature, while double heterojunction lasers can work continuously at room temperature.

Among them, laser diodes include single heterojunction (SH), double heterojunction (DH) and quantum well (QW) laser diodes. Quantum well laser diodes have the advantages of low threshold current and high output power, and are the mainstream products in the market. Compared with lasers, laser diodes have the advantages of high efficiency, small size and long life, but their output power is small (generally less than 2mW), poor linearity, and poor monochromaticity, which makes their application in cable TV systems limited. It is very limited and cannot transmit multi-channel, high-performance analog signals. In the backhaul module of the bidirectional optical receiver, the quantum well laser diode is generally used as the light source for uplink emission.

Illustratively, a collimating lens refers to an instrument that transforms light from each point in the aperture column into a collimated beam of parallel light.

Exemplarily, the optical fiber 600 is disposed after the beam combiner 300, and is used to transmit the polarized light signal after the third polarized light signal is combined.

In the above implementation process, the optical fiber may be a single-mode fiber. Among them, a single-mode fiber (SingleModeFiber, SMF) has a very thin central glass core (the core diameter is generally 9 or 10 μm), and can only transmit one mode of fiber. Therefore, its intermodal dispersion is very small, which is suitable for long-distance communication, but there are also material dispersion and waveguide dispersion, so the single-mode fiber has higher requirements on the spectral width and stability of the light source, that is, the spectral width should be narrow and stable. Be good. Later, it was found that at the wavelength of 1.31 μm, the material dispersion and the waveguide dispersion of the single-mode fiber are positive and negative, and the magnitudes are exactly the same. In this way, the 1.31μm wavelength region has become an ideal working window for optical fiber communication, and it is also the main working band of the practical optical fiber communication system. OK, so this fiber is also called G652 fiber.

Compared with multi-mode fiber, single-mode fiber can support longer transmission distance. From 100Mbps Ethernet to 1G Gigabit network, single-mode fiber can support more than 5000m transmission distance.

From a cost point of view, since the optical transceiver is very expensive, the cost of using a single-mode fiber is higher than that of a multi-mode fiber optic cable.

The refractive index distribution is similar to that of the abrupt fiber, the diameter of the core is only 8-10 μm, and the light propagates in a straight line along the central axis of the core. Because this fiber can only transmit one mode (the two polarization states are degenerate), it is called a single-mode fiber, and its signal distortion is small.

Illustratively, the optical isolator 700 is disposed between the optical fiber 600 and the beam combiner 300 .

Exemplarily, the optical isolator 700 is a passive optical device that allows only one-way light to pass, and its working principle is based on the non-reciprocity of Faraday rotation. The light reflected back by the fiber can be well isolated by the optical isolator. Optical isolators mainly use the Faraday effect of magneto-optical crystals. The characteristics of optical isolators are: low forward insertion loss, high reverse isolation, and high return loss. An optical isolator is a passive device that allows light to pass in one direction and prevents it from passing in the opposite direction. Its function is to limit the direction of light so that light can only be transmitted in one direction. Good isolation, improve light wave transmission efficiency.

Exemplarily, the first part of the circuit board 800 is disposed before the second surface of the polarization beam combiner 200 , and the second part of the circuit board 800 is disposed before the half-wave plate 100 .

Exemplarily, the circuit board 800 may be referred to as a printed circuit board or a printed circuit board (Printed Circuit Board, PCB), and provides electronic hardware support for the multi-wavelength coupled light emitting device.

Exemplarily, the first part of the heat sink 900 is disposed between the first part of the circuit board 800 and the second surface of the polarization beam combiner 200, and the second part of the heat sink 900 is disposed between the second part of the circuit board 800 and the half-wave Between 100 slices.

Exemplarily, the heat sink 900 is a material with high thermal conductivity, such as metallic copper or the like. Since the devices that generate optical signals (such as laser diodes, etc.) will generate a lot of heat during operation, it is necessary to install the devices that generate optical signals on the heat sink 900 to help dissipate heat, thereby stabilizing the operating temperature and improving the stability and performance of the device. safety.

Alternatively, the heat sink 900 may be an L-shaped right angle heat sink.

In some embodiments, the first laser group 410 and the second laser group 510 in the multi-wavelength coupled light emitting device each include two semiconductor (LD) lasers; the four LD lasers are mounted in parallel on the L-shaped right-angle heat sink 900 , in which the four LD lasers emit different wavelengths of λ1, λ2, λ3, and λ4 respectively, and the λ1, λ3 and λ2, λ4 beams are placed vertically; at this time, the polarization states of the four LD lights are parallel. A collimating lens is placed in front of each LD laser to realize the collimation of four wavelength beams. The λ2 and λ4 beams pass through the half-wave plate 100, and the angle between the vibrational state of the linearly polarized light when the half-wave plate 100 is incident and the main section of the half-wave plate crystal is set to be 45°, then the vibrational state of the transmitted linearly polarized light changes from The original orientation is turned 90 degrees. Therefore, the polarization states of λ1, λ3 and λ2, λ4 are orthogonal to each other. The glued plane of the polarization beam combiner 200 is coated with a polarization beam splitter film, so that the optical signals λ2 and λ4 with vertical polarization states are reflected, and the optical signals λ1 and λ3 with parallel polarization states are transmitted. Thus, the four beams are polarized and combined into two parallel beams.

In addition, the two parallel beams of λ1, λ2, λ3, and λ4 are input into the wavelength division optical combiner. The wavelength division optical combiner is composed of two dielectric thin film filters and high-reflection films, which can easily realize the integration of λ1, λ2 and λ3, λ4 Four-way wavelength division beam combining. The combined four-way light wavelengths are converged by a condensing lens, and then coupled into a single-mode fiber with high efficiency through an isolator.

Obviously, the multi-wavelength coupled light emitting device can be extended to combine and couple more light beams with different wavelengths, such as combining and coupling eight light beams with different wavelengths.

和“●”表示偏振光信号的偏振态。In some embodiments, the beam combiner 300 may use a large clear aperture condensing lens; please refer to FIG. 3 , which is a schematic structural diagram of a multi-wavelength coupled light emitting device provided in an embodiment of the present application. The light emitting device includes a half-wave plate 100, a polarization beam combiner 200, a large clear aperture condensing lens 320, a first laser group 410, a first collimating lens group 420, a second laser group 510, a second collimating lens group 520, Optical fiber 600, optical isolator 700, circuit board 800 and heat sink 900, wherein

And "•" indicates the polarization state of the polarized light signal.

Exemplarily, the distances between the two parallel beams of λ1, λ2 and λ3, λ4 depend on the distance d of the respective lasers in the first laser group 410 and the second laser group 510, and usually d is several hundreds of micrometers. The large clear aperture condensing lens 320 is used to combine the two groups of dense parallel light beams and couple them into the optical fiber 600 . At this time, the optical fiber 600 is a thermally expanded core fiber, which can improve the coupling efficiency.

Optionally, the optical fiber 600 can also be a fiber lens, such as a spherical or conical lens.

Exemplarily, thermally expanded core fibers (TEC fibers) are a new type of microlens fiber whose main feature is that the local core diameter of the fiber is larger than that of ordinary single-mode fibers, and the outer cladding radius remains unchanged. .

Likewise, the multi-wavelength coupled light emitting device can be extended to combine and couple more beams of different wavelengths, such as combining and coupling eight beams of different wavelengths.

In some embodiments, the first laser group 410 may include two or more lasers; correspondingly, the first collimating lens group 420 , the second laser group 510 , and the second collimating lens group 520 are provided accordingly. Referring to FIG. 4 , FIG. 4 is a multi-wavelength coupled light emitting device provided by an embodiment of the present application.

Exemplarily, in the multi-wavelength coupled light emitting device, the first laser group 410 includes 4 lasers; correspondingly, the first collimating lens group 420 includes 4 collimating lenses, the second laser group 510 includes 4 lasers, The second collimating lens group 520 includes 4 collimating lenses.

Optionally, as required, the multi-wavelength coupled light emitting device can be extended to combine and couple more light beams with different wavelengths.

In some implementation scenarios, the multi-wavelength coupled light emitting device passes through the half-wave plate 100 to rotate the polarized light polarization state of the first polarized light signal group by 90°, and then passes the polarization beam combiner 200 to combine the first polarized light signal group with the polarized light signal group. The second polarized light signal groups are combined into a third polarized light signal group, so that each group of polarized light signals after combining in the third polarized light signal group is orthogonal to each other. The third combined beam of polarized light signals is one signal and is emitted; therefore, the multi-wavelength coupled light emitting device can combine the polarized light signals into mutually orthogonal polarized light signals through the polarization beam combiner, which can simplify the optical path Structure and realization process, technical effect of reducing wavelength-dependent loss.

In addition, in some implementation scenarios, the optical path structure of the multi-wavelength coupled optical emitting device is simple, which is conducive to reducing the size of the multi-wavelength emitting optical device, and can also reduce the multi-wavelength optical path difference of LAN and WDM, thereby improving wavelength-dependent loss and light output. Power consistency.

In all the embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "up" and "lower" are relative terms. Relative expressions of terms are not repeated in the embodiments of the present application.

It should be understood that references throughout the specification to "in this embodiment", "in this embodiment of the present application" or "as an alternative embodiment" mean that specific features, structures or characteristics related to the embodiment include In at least one embodiment of the present application. Thus, the appearances of "in this embodiment," "in this embodiment of the application," or "as an alternative implementation" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the specific features, structures or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

In the various embodiments of the present application, it should be understood that the size of the sequence numbers of the above-mentioned processes does not imply an inevitable sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be implemented in the present application. The implementation of the examples constitutes no limitation.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall prevail with the protection scope of the claims.

Claims (10)

1. A multi-wavelength coupling light emitting device is characterized by comprising a half-wave plate, a polarization beam combiner and a beam combiner,

the half-wave plate is used for deflecting a first polarized light signal group, and the first polarized light signal group at least comprises two polarized light signals;

the polarization beam combining mirror is arranged behind the half-wave plate, and the first polarization optical signal group is incident to a first surface of the polarization beam combining mirror and reflected by the polarization beam combining mirror; the second polarized light signal group is incident to the second surface of the polarization beam combining mirror and is transmitted, and polarized light signals in the second polarized light signal group and polarized light signals of the first polarized light signal group are pairwise combined into a third polarized light signal group;

the beam combiner is arranged in front of the first surface of the polarization beam combiner and used for combining and transmitting the polarized light signals in the third polarized light signal group.

2. The multi-wavelength coupled light emitting device according to claim 1, further comprising a first group of lasers and a first group of collimating lenses,

the first laser group is arranged in front of the half-wave plate and used for transmitting the polarized light signals of the first polarized light signal group;

the first collimating lens group is arranged between the first laser group and the half-wave plate and is used for collimating the polarized light signals of the first polarized light signal group.

3. The multi-wavelength coupled light emitting device according to claim 1, further comprising a second group of lasers and a second group of collimating lenses,

the second laser group is arranged in front of the second surface of the polarization beam combiner and used for transmitting the second polarized optical signal group;

the second collimating lens group is arranged between the second laser group and the polarization beam combiner and is used for collimating the polarized light signals of the second polarized light signal group.

4. The apparatus according to claim 1, wherein the combiner is a wavelength division optical combiner, the wavelength division optical combiner comprises a plurality of inputs and an output, and the inputs of the wavelength division optical combiner are in one-to-one correspondence with the polarized optical signals of the third polarized optical signal group.

5. The apparatus according to claim 4, further comprising a converging lens disposed after the output of said wavelength division optical combiner.

6. The multi-wavelength coupled light emitting device according to claim 1, wherein the beam combiner is a large clear aperture converging lens.

7. The apparatus according to claim 1, further comprising an optical fiber disposed behind the beam combiner for transmitting the combined polarized light signal of the third polarized light signal.

8. The multi-wavelength coupled light emitting device according to claim 7, further comprising an optical isolator disposed between said optical fiber and said beam combiner.

9. The apparatus according to claim 1, further comprising a circuit board, a first portion of the circuit board being disposed in front of the second face of the polarization beam combiner, a second portion of the circuit board being disposed in front of the half-wave plate.

10. The apparatus according to claim 9, further comprising a heat sink, a first portion of the heat sink being disposed between the first portion of the circuit board and the second side of the polarization beam combiner, a second portion of the heat sink being disposed between the second portion of the circuit board and the half-wave plate.

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