CN219871872U

CN219871872U - Combo PON optical engine

Info

Publication number: CN219871872U
Application number: CN202321013017.1U
Authority: CN
Inventors: 周情; 贾利
Original assignee: Accelink Technologies Co Ltd
Current assignee: Accelink Technologies Co Ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-10-20
Anticipated expiration: 2033-04-28

Abstract

The utility model relates to the technical field of optical communication, in particular to a Combo PON optical engine, which comprises a packaging shell, a TFF component, an RX end lens, a flexible circuit board, a main circuit board, a first optical transmission component, a second optical transmission component, a main lens and an optical fiber plug, wherein the main circuit board is inserted into the packaging shell through a slot of a first end face of the packaging shell and is connected with a photoelectric detector through the flexible circuit board, the RX end lens is positioned at the RX end of the TFF component, the first optical transmission component and the second optical transmission component are arranged at the TX end of the TFF component in parallel, the main lens is positioned between the TFF component and the optical fiber plug, the optical fiber plug is connected into the packaging shell through a through hole of a second end face of the packaging shell, and the flexible circuit board, the RX end lens, the TFF component, the first optical transmission component and the second optical transmission component are embedded in the packaging shell.

Description

Combo PON optical engine

Technical Field

The utility model relates to the technical field of optical communication, in particular to a Combo PON optical engine.

Background

The Combo PON (Combined Passive OptiCal Network ) is a novel optical fiber communication technology, and can support the conventional GPON (Gigabit Passive Optical Networks, gigabit passive optical network) and EPON (Ethernet Passive Optical Network ) protocols at the same time, so that the Combo PON technology can improve network bandwidth and extend coverage, is widely applied to a modern broadband access network, and can be used for providing high-speed and stable network services in life, thereby meeting various demands in daily life and work of people.

OSA (OptiCal SpeCtrum Analyzer ) designs of Combo PON photoelectric devices mainly adopted in industry are coaxial type packaging in TO (Transistor Outline, transistor packaging form) packaging mode, and fully-closed type packaging is characterized in that the defects of the packaging method are as follows:

1. the TO seat is made of kovar, only the outer diameter part dissipates heat, and the material has low heat conductivity, and even if a special packaging process is adopted in the TO seat, the temperature requirement of industrial-grade application with high yield still cannot be met.

2. TO packages are limited by material size and overall OSA size is limited and cannot be made shorter and smaller. The demands for small-sized OSA become more and more evident as the integration level of PON systems becomes higher.

In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art.

Disclosure of Invention

The utility model solves the technical problems that:

the TO seat only has the outer diameter part for radiating, the radiating area is small, and the radiating performance can not meet the temperature requirement of industrial application; TO packages are self-contained TO caps, and TO packages are limited in material size, and the overall OSA size is limited and cannot be made shorter and smaller.

The utility model achieves the aim through the following technical scheme:

the utility model provides a Combo PON optical engine, comprising: a package housing 1, a TFF component 2, an RX end lens 3, a flexible circuit board 4, a main circuit board 5, a first optical transmission component 6, a second optical transmission component 7, a main lens 8 and an optical fiber plug 9;

the main circuit board 5 is inserted into the package housing 1 through a slot 12 of the first end face 11 of the package housing 1, one end of the flexible circuit board 4 is connected with an RX end circuit, the other end of the flexible circuit board 4 is connected with the main circuit board 5, and the RX end lens 3 is positioned at the RX end of the TFF assembly 2;

the first optical transmission component 6 and the second optical transmission component 7 are arranged at the TX end of the TFF component 2 in parallel;

the main lens 8 is located between the TFF component 2 and the fiber optic plug 9;

the optical fiber plug 9 is connected to the inside of the package housing 1 through a through hole of the package housing second end surface 13;

the TFF component 2, the RX end lens 3, the flexible circuit board 4, the first optical transmission component 6 and the second optical transmission component 7 are embedded in the package housing 1.

Preferably, the package housing 1 is a non-airtight package, and is made of one of tungsten copper, kovar, stainless steel and 304L powder metallurgy.

Preferably, the first optical transmission assembly 6 includes: a first COC component 61, a first lens 62, a first optical isolator 63, wherein the first lens 62 is located between the first COC component 61 and the first optical isolator 63.

Preferably, the first COC module 61 is connected to the main circuit board 5 in a gold wire bonding manner.

Preferably, the second optical transmission assembly 7 includes: a second COC component 71, a second lens 72, a second optical isolator 73, wherein the second lens 72 is located between the second COC component 71 and the second optical isolator 73.

Preferably, the second COC component 71 is connected to the main circuit board 5 by gold wire bonding.

Preferably, the TFF assembly 2 includes a support 20, and a first filter 21, a second filter 22, a third filter 23, a fourth filter 24, a fifth filter 25 and a sixth filter 26 are sequentially disposed on a side of the support 20 facing the main circuit board 5 at intervals;

the first filter 21 corresponds to the first optical transmission component 6, the second filter 22 corresponds to the second optical transmission component 7, the third filter 23 and the fourth filter 24 correspond to the RX end lens 3, the fifth filter 25 is disposed on opposite sides of the second filter 22, the third filter 23 and the fourth filter 24, and the sixth filter 26 is disposed on opposite sides of the first filter 21;

the positions corresponding to the first filter 21 and the second filter 22 are TX ends of the TFF assembly 2, and the positions corresponding to the third filter 23 and the fourth filter 24 are RX ends of the TFF assembly 2.

Preferably, the material of the support 20 of the TFF assembly 2 is one of glass, metal and plastic.

Preferably, an inclination angle is formed between the bracket 20 and the bottom surface of the package housing 1, and the inclination angle is less than or equal to 45 degrees.

Preferably, the RX end lens 3 includes a first optical surface 31, a second optical surface 32, and a third optical surface 33, where the second optical surface 32 is disposed at 45 degrees to the first optical surface 31 and the third optical surface 33, respectively;

the first optical surface 31 is disposed near the RX end of the TFF component 2, and a photodetector 34 is disposed below the third optical surface 33.

Compared with the prior art, the utility model has the beneficial effects that:

according TO the utility model, the TO airtight packaging mode is replaced by a non-airtight packaging mode, a TO seat and a TO cap of the TO packaging are omitted, ports are concentrated in one shell, TX and RX ports are distributed in the same direction, and the size is smaller; the light transmission assembly is connected with the packaging shell through the large-area metal shell, so that the heat dissipation area is large, and the heat dissipation effect is better.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of a Combo PON optical engine according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of an optical transmission component of a Combo PON optical engine according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of gold bonding between a main circuit board and a COC component of a Combo PON optical engine according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of a TFF component light splitting principle of a Combo PON optical engine according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of an optical transmission principle of an RX end lens of a Combo PON optical engine according to an embodiment of the present utility model.

Detailed Description

In the description of the present utility model, the terms "inner", "upper", "lower", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, for convenience of description of the present utility model only and not to require that the present utility model must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1:

an embodiment of the present utility model provides a Combo PON optical engine, as shown in fig. 1, including: package housing 1, TFF component 2, RX end lens 3, flexible circuit board 4, main circuit board 5, first optical transmission component 6, second optical transmission component 7, main lens 8, and fiber optic plug 9.

The main circuit board 5 is inserted into the package housing 1 through the slot 12 of the first end face 11 of the package housing 1, so as to achieve the purpose of non-airtight package, the flexible circuit board 4 is connected with the photoelectric detector, so as to solve the problem of height difference between the main circuit board 5 and the RX end circuit, the other end of the flexible circuit board 4 is connected with the main circuit board 5, the main circuit board 5 is used for realizing electric driving and electric signal transmission functions in photoelectric conversion, and the RX end lens 3 is positioned at the RX end of the TFF assembly 2, so that light energy of each channel is coupled into the photoelectric detector 34.

In an actual application scenario, the first optical transmission component 6 and the second optical transmission component 7 are arranged at the TX end of the TFF component 2 in parallel, and are used for transmitting light of 1577nm and 1490nm into the TFF component 2. In particular, the first light transmission component 6 is configured to transmit light at 1577 nm; the second light transmission component 7 is configured to transmit 1490nm light.

The main lens 8 is located between the TFF component 2 and the fiber plug 9 for coupling light output from the TX end of the TFF component 2 into the fiber while collimating 1270nm and 1310nm light returned from the fiber into the TFF component 2.

Wherein the optical fiber plug 9 is connected to the inside of the package housing 1 through a through hole of the second end face 13 of the package housing 1; the TFF component 2, the RX end lens 3, the flexible circuit board 4, the first optical transmission component 6 and the second optical transmission component 7 are embedded in the package housing 1.

According TO the embodiment of the utility model, the TO airtight packaging mode is replaced by the non-airtight packaging mode, the COC at the bottom of the chip and the module structural member are connected by adopting the large-area metal shell, the heat dissipation performance is better, the LD chip patch precision requirement is reduced, the coupling of the front end lens of the chip is more convenient, and the theoretical coupling efficiency can easily reach more than 80% by adopting the parallel light scheme.

As shown in fig. 1, the package housing 1 is a non-airtight package, provides a housing package for all components, so that the erosion rate of water vapor and the like is reduced, the reliability is better, and simultaneously provides a bottom heat dissipation channel for a main heat source of an optical chip, wherein the material is one of tungsten copper, kovar, stainless steel and a material made of 304L powder metallurgy, and in a specific research process, the heat dissipation performance of the tungsten copper is the best, and the tungsten copper can be the best to adapt to the application scene of the utility model.

As shown in fig. 2, the first optical transmission component 6 includes a first COC component 61, a first lens 62 and a first optical isolator 63, where the first lens 62 is located between the first COC component 61 and the first optical isolator 63, the first COC component 61 is connected to the main circuit board 5 in a gold wire bonding manner (as shown in fig. 3), the first COC component 61 includes an EML (Electro Absorption Modulated Laser, electro-absorption modulated laser) optical chip, the EML optical chip is used to convert an electrical signal sent by the main circuit board 5 into an optical signal, the converted 1577nm light passes through the first lens 62, the first lens 62 converts the 1577nm light into collimated light to enter the TFF component 2 for splitting and combining, while the first lens 62 couples the 1577nm optical power to the TX end (as shown in fig. 4) of the maximum input TFF component 2, and the first optical isolator 63 is used to block the light returned from the inside of the optical fiber plug 9 from reflecting into the first COC component 61.

Similarly, the second optical transmission component 7 includes a second COC component 71, a second lens 72 and a second optical isolator 73, where the second lens 72 is located between the second COC component 71 and the second optical isolator 73, the second COC component 71 is also connected to the main circuit board 5 in a gold wire bonding manner (as shown in fig. 3), the second COC component 71 includes a DFB (Distributed Feed Back ) optical chip, the DFB optical chip is used to convert an electrical signal sent by the main circuit board 5 into an optical signal, the converted 1490nm light passes through the second lens 72, the second lens 72 converts the 1490nm light into collimated light to enter the TFF component 2 for splitting and beam combining, and the second lens 72 couples the optical power of 1490nm to the TX end (as shown in fig. 4) of the maximum input TFF component 2, and the second optical isolator 73 is used to block the light returned inside the optical fiber plug 9 from reflecting into the first COC component 61.

The bottoms of the first COC component 61 and the second COC component 71 are aluminum nitride thermal deposition substrate and TEC (Thermoelectric cooler, semiconductor refrigerator) refrigerator, and the first lens 62 and the second lens 72 are made of one of silicon and optical glass.

According TO research investigation, the traditional Combo PON photoelectric device OSA is divided into four ports, two transmitting ports (the central wavelength 1577nm and the wavelength 1490 nm) and two receiving ports (the central wavelength 1310nm and the wavelength 1270 nm), the existing scheme adopts a TFF (Thin Film Filter) light splitting mode, the four ports adopt a TO packaging mode, the TFF is embedded between bases, the four ports TO and base are coupled in a laser welding or adhesive mode, finally the light ports are uniformly used for emitting light and entering light by one light port, and the two TX ports and the two RX ports are respectively distributed in different directions and are four-way devices, so that the design is unfavorable for meeting the requirements of high integration of the small-size OSA and PON systems.

According to the scheme, TFF (time division multiplexing) is adopted, 4 ports of TX and RX are distributed in the same direction, and the requirement of high-degree integration of a small-size OSA and a PON system is met. Specifically, the TFF component 2 includes a support 20, a first filter 21, a second filter 22, a third filter 23 and a fourth filter 24 are sequentially disposed on a side of the support 20 facing the main circuit board 5 at intervals, and a fifth filter 25 and a sixth filter 26 are sequentially disposed on a side of the support 20 facing the optical fiber plug 9 at intervals.

The first filter 21 corresponds to the first optical transmission assembly 6, the second filter 22 corresponds to the second optical transmission assembly 7, the third filter 23 and the fourth filter 24 correspond to the RX end lens 3, the fifth filter 25 is disposed on opposite sides of the second filter 22, the third filter 23 and the fourth filter 24, and the sixth filter 26 is disposed on opposite sides of the first filter 21.

Namely, the positions corresponding to the first filter 21 and the second filter 22 are TX ends of the TFF assembly 2, the positions corresponding to the third filter 23 and the fourth filter 24 are RX ends of the TFF assembly 2, the two TX ports and the two RX ports adopt one TFF assembly 2 comprising MUX (multiplexing) and DMUX (Demultiplexing) to perform beam splitting and beam combining, 4 ports of TX and RX are distributed in the same direction, the light inlet port and the light outlet port are on opposite sides, and the main circuit board 5 is directly inserted into the housing and the chip is connected by a wire.

As shown in fig. 4, the TFF component 2 includes a TX port and an RX port, where the TX port and the RX port use a MUX & DMUX to perform beam splitting and beam combining, so that the TX end and the RX end are integrated together to form a single-fiber multi-directional OSA. The TX port is divided into two beams of light for wave combination, 1577nm and 1490nm, and 1577nm of light is directly transmitted to the port output of the optical fiber plug through the TFF component 2, and 1490nm of light is transmitted to the optical port output through the transmission and twice reflection of the TFF component 2; the RX port is divided into two beams of light for splitting, light of 1270nm and 1310nm and light of 1270nm are input to the TFF assembly 2 through the sixth filter 26, light of 1270nm is transmitted through the sixth filter 26 in sequence, and the first filter 21, the fifth filter 25, the second filter 22, the fifth filter 25, the third filter 23 and the fifth filter 25 reflect and are transmitted to the RX port of 1270nm of the RX end lens 3 through the fourth filter 24; the 1310nm light is transmitted through the sixth filter 26, the first filter 21, the fifth filter 25, the second filter 22 and the fifth filter 25 in turn, and then transmitted through the third filter 23 to the 1310nm RX port of the RX end lens 3. From the above, it is not difficult to derive the functions of the first filter 21 to the sixth filter 26 as follows:

the first filter 21: transmits at 1577nm center wavelength and totally reflects at 1270nm, 1310nm and 1490nm center wavelengths;

second filter 22: transmitting at 1490nm center wavelength and totally reflecting at 1270nm and 1310nm center wavelengths;

third filter 23: transmits at a center wavelength of 1310nm and totally reflects at a center wavelength of 1270 nm;

fourth filter 24: all transmission to 1270nm center wavelength;

a fifth filter 25 serving as a mirror for all the wavelength reflection films;

sixth filter 26: the transparent film is an antireflection film for the total transmission of 1577nm,1490nm,1310nm and 1270 nm.

The parallelogram-shaped plate in the figure is a support 20 of the TFF assembly 2, the support 20 is an element for supporting the first filter 21-the sixth filter 26, and an inclination angle is provided between the support and the bottom surface of the package housing 1, the inclination angle is less than or equal to 45 degrees, and the support may be made of glass, or may be made of a light-transmitting material such as an air support, or may be a metal housing, and the metal housing may be integrally formed with the package housing 1, so that light is transmitted inside the housing.

The above optical splitting and beam combining elements constitute a MUX & DMUX integrator of TFF assembly 2.

1270nm light and 1310nm light are transmitted to an RX end lens 3 via an RX end of the TFF assembly 2, as shown in fig. 5, the RX end lens 3 comprising a first optical surface 31, a second optical surface 32 and a third optical surface 33, the second optical surface 32 being disposed at 45 degrees to the first optical surface 31 and the third optical surface 33, respectively; the incident light angles of the third filter 23 and the fourth filter 24 may be 8 degrees, 13 degrees or other angles less than or equal to 45 degrees, which are consistent with the mechanical angle of the support 20, a photodetector 34 is disposed under the RX plastic lens array, a photosensitive plate is disposed on the photodetector 34, the light transmitted through the RX end of the TFF assembly 2 passes through the first optical surface 31, and is reflected by the second optical surface 32 onto the photosensitive plate of the photodetector 34 under the third optical surface 33, and the photodetector 34 converts the light signal into an electrical signal. Meanwhile, in the embodiment of the utility model, the RX end lens 3 is made of PEI.

After the photodetector 34 under the RX end lens 3 converts the optical signal into an electrical signal, the electrical signal is transmitted to the main circuit board 5 by the flexible circuit board 4 connecting the photodetector 34 and the main circuit board 5.

If there is no height difference between the main circuit board 5 and the photo detector 34, the main circuit board 5 and the photo detector 34 can be directly connected by gold wires, but in the embodiment of the present utility model, as shown in fig. 5, the photo detector 34 is located below the RX end lens 3, and there is a height difference between the main circuit board 5 and the photo detector 34, so that the problem of the height difference can be well solved by using the flexible circuit board 4 for connection.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A Combo PON optical engine comprising: the optical fiber module comprises a packaging shell (1), a TFF (thin film filter) component (2), an RX end lens (3), a flexible circuit board (4), a main circuit board (5), a first optical transmission component (6), a second optical transmission component (7), a main lens (8) and an optical fiber plug (9);

the main circuit board (5) is inserted into the package shell (1) through a slot (12) of the first end face (11) of the package shell (1), one end of the flexible circuit board (4) is connected with the photoelectric detector (34), the other end of the flexible circuit board (4) is connected with the main circuit board (5), and the RX end lens (3) is positioned at the RX end of the TFF assembly (2);

the first optical transmission component (6) and the second optical transmission component (7) are arranged at the TX end of the TFF component (2) in parallel and are used for transmitting light of 1577nm and 1490nm into the TFF component (2);

-the main lens (8) is located between the TFF-assembly (2) and the fiber plug (9);

the optical fiber plug (9) is connected to the inside of the packaging shell (1) through a through hole of the second end surface (13) of the packaging shell (1);

the TFF assembly (2), the RX end lens (3), the flexible circuit board (4), the first optical transmission assembly (6) and the second optical transmission assembly (7) are embedded in the package housing (1).

2. The Combo PON optical engine according to claim 1, wherein the package housing (1) is a non-hermetic package, and is made of one of tungsten copper, stainless steel, and a material made of 304L powder metallurgy.

3. A Combo PON optical engine according to claim 1, wherein the first optical transmission component (6) comprises: a first COC component (61), a first lens (62) and a first optical isolator (63), wherein the first lens (62) is located between the first COC component (61) and the first optical isolator (63).

4. A Combo PON light engine according to claim 3, wherein the first COC component (61) is connected to the main circuit board (5) in a gold wire bond.

5. A Combo PON optical engine according to claim 1, wherein the second optical transmission component (7) comprises: a second COC component (71), a second lens (72) and a second optical isolator (73), wherein the second lens (72) is located between the second COC component (71) and the second optical isolator (73).

6. A Combo PON optical engine according to claim 5, wherein the second COC component (71) is connected to the main circuit board (5) in a gold wire bond.

7. The Combo PON optical engine according to claim 1, wherein the TFF assembly (2) comprises a bracket (20), a first filter (21), a second filter (22), a third filter (23) and a fourth filter (24) are sequentially arranged at intervals on a side of the bracket (20) facing the main circuit board (5), and a fifth filter (25) and a sixth filter (26) are sequentially arranged on a side of the bracket (20) facing the optical fiber plug (9);

the first filter (21) corresponds to the first light transmission component (6), the second filter (22) corresponds to the second light transmission component (7), the third filter (23) and the fourth filter (24) correspond to the RX end lens (3), the fifth filter (25) is arranged on the opposite sides of the second filter (22), the third filter (23) and the fourth filter (24), and the sixth filter (26) is arranged on the opposite side of the first filter (21);

the positions corresponding to the first filter (21) and the second filter (22) are TX ends of the TFF assembly (2), and the positions corresponding to the third filter (23) and the fourth filter (24) are RX ends of the TFF assembly (2).

8. The Combo PON optical engine according to claim 7, wherein the material of the stand (20) is one of glass, metal and plastic.

9. The Combo PON optical engine according to claim 7, wherein an inclination angle is provided between the bracket (20) and a bottom surface of the package housing (1), the inclination angle being 45 degrees or less.

10. The Combo PON optical engine according to any one of claims 1-9, wherein the RX end lens (3) comprises a first optical surface (31), a second optical surface (32) and a third optical surface (33), the second optical surface (32) being disposed at 45 degrees to the first optical surface (31) and the third optical surface (33), respectively;

the first optical surface (31) is arranged close to the RX end of the TFF assembly (2), and a photoelectric detector (34) is arranged below the third optical surface (33).