CN202177756U

CN202177756U - Optical isolator and light assembly containing same

Info

Publication number: CN202177756U
Application number: CN2011202970362U
Authority: CN
Inventors: 梁韬; 张晓峰; 蒋艳锋
Original assignee: Shenzhen Neo Photonic Technology Co Ltd
Current assignee: Shenzhen Neo Photonic Technology Co Ltd
Priority date: 2011-08-16
Filing date: 2011-08-16
Publication date: 2012-03-28
Anticipated expiration: 2021-08-16

Abstract

The utility model provides an optical isolator. A polarizer, a faraday optical rotation device and a filter plate are sequentially arranged on the optical isolator along the incidence optical axis of light in the forward direction. A light emitting assembly TOSA containing the optical isolator is further provided and comprises a laser and a single-fiber adapter. The optical isolator is arranged on a first optical axis between light end faces of the laser and the single-fiber adapter. Due to the fact that the optical isolator with the structure adopts the filter plate with lower price to replace an analyzer with higher price, cost of the whole optical isolator is reduced without affecting performance of the optical isolator. A single-fiber two-way light receiving and transmitting integrated assembly BOSA containing the optical isolator is further provided. The BOSA comprises a laser, a light receiver and a single-fiber adapter. The optical isolator is arranged on a first optical axis between light end faces of the laser and the single-fiber adapter, the light receiver is arranged on a second optical axis, and the second optical axis is perpendicular to the first optical axis.

Description

A kind of optoisolator and contain the optical assembly of this isolator

Technical field

The utility model relates to the high speed optical communication device, relates in particular to a kind of have optoisolator of isolating backlight and the optical assembly that contains this isolator.

Background technology

In the Optical Fiber Transmission of two-forty, long distance, need stop reflected light with optoisolator; Optoisolator is an a kind of Passive Optical Components that allows unidirectional light to pass through; Its principle of work is based on the nonreciprocity of faraday's rotation; Optoisolator as shown in Figure 1 is for the flashlight of forward entrance, through becoming linearly polarized light behind the polarizer 1; Faraday's gyromagnetic medium 2 makes 45 ° of the polarization direction right rotations of flashlight with external magnetic field, and just low-loss through become the analyzer 3 of 45 ° of placements with the polarizer.For backlight, the linearly polarized light of analyzer 3 is during through faraday gyromagnetic medium 2, also 45 ° of right rotations of yawing moment, thus making polarization direction and the polarizer 1 direction quadrature of backlight, can not pass through, so just blocked catoptrical transmission fully.But this structured light isolator volume is big, defect of high cost, has limited its widespread use.

The utility model content

For overcoming above shortcoming, it is simple in structure that the utility model provides, the optoisolator that cost is low and contain the optical assembly of this isolator.

For realizing above goal of the invention, the utility model provides a kind of optoisolator, and along being provided with successively on the forward light incident light axis: a polarizer, a Faraday device and an optical filter, this optical filter and said incident light optical axis are an angle theta.

The utility model also provides a kind of light emission component TOSA (Transmitter Optical Sub-assembly) that contains the aforementioned lights isolator; Comprise a laser instrument and a single fiber adapter, said optoisolator is on the primary optic axis between said laser instrument and the single fiber adapter light end face.

The utility model provides also a kind of light transmit-receive integrated assembly BOSA of single fiber bi-directional (Bidirectional Optical Sub-Assembly) that contains the aforementioned lights isolator; Comprise a laser instrument, an optical receiver and a single fiber adapter; Said optoisolator is on the primary optic axis between said laser instrument and the single fiber adapter light end face; Said optical receiver is positioned on second optical axis, and this second optical axis is vertical with said primary optic axis.

Because the optoisolator of said structure adopts the lower optical filter of price to substitute the higher analyzer of price, thereby neither influences the performance of optoisolator, has reduced the cost of overall optical isolator again.The optoisolator of the utility model is positioned between laser instrument and the single fiber, constitutes a kind of new type light emitting module TOSA of high-isolation, prevent that laser emitting light from influencing laser performance from fiber end face reflection back.In addition, the light emission component of the utility model is increased by an optical receiver, constitute the light transmit-receive integrated assembly BOSA of the novel single fiber bi-directional of a kind of high-isolation, both can prevent the laser emitting reflection of light, can prevent single fiber input light reflection interference again.

Description of drawings

Fig. 1 representes prior art optical isolator structure synoptic diagram;

Fig. 2 representes the utility model optical isolator structure synoptic diagram;

Fig. 3 representes optical filter P light shown in Figure 2 and S light transmittance graph figure separately;

Fig. 4 representes to have the light emission component TOSA structural representation of optoisolator shown in Figure 2;

Fig. 5 representes to have the light transmit-receive integrated assembly BOSA of the single fiber bi-directional structural representation of optoisolator shown in Figure 2.

Embodiment

Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.

Optoisolator 100 as shown in Figure 2, along being provided with successively on the forward light incident light axis: a polarizer 10, a Faraday device 20 and an optical filter 30, this optical filter and incident light optical axis are an angle theta, and angle theta the best is 45 °.For the flashlight of forward entrance, through becoming linearly polarized light behind the polarizer 10, faraday's gyromagnetic medium 20 makes 45 ° of the linearly polarized light polarization direction right rotations of flashlight with external magnetic field.

By the P light of optical filter 30 as shown in Figure 3 and S light separately transmittance graph figure know that λ 1 expression is satisfied the P light transmission simultaneously more than or equal to optical filter P light required value and the S light transmission minimum wavelength value smaller or equal to optical filter S light required value; λ 2 expression is satisfied the P light transmission simultaneously more than or equal to optical filter P light required value and the maxima of waves long value of S light transmission smaller or equal to optical filter S light required value, and the size of λ 1, λ 2 is big or small relevant with the transmissivity of optical filter 30 defineds.As long as the lambda1-wavelength λ value of optical filter 30 is between λ 1 and λ 2 scopes; Through the adjustment polarizer 10; Make the forward polarisation of light direction after process faraday gyromagnetic medium 20 has rotated 45 ° consistent with the P light direction of optical filter 30, polarized light just can remain unchanged through optical filter 30 and polarization direction.Equally; When being incident to optical filter 30 for the backlight of λ value between λ 1 and λ 2 scopes, its polarization direction is an any direction, but also has only the polarized light consistent with the P light direction of optical filter 30 just can see through optical filter 30; Backlight after the transmission also rotates 45 ° through Faraday device 20 rear polarizer directions; The polarization direction of the direction of polarized light of rotation back backlight and the polarizer 10 differs 90 degree like this, therefore can not pass through the polarizer 10, thereby reaches the effect of isolating backlight.

Light emission component TOSA with optoisolator 100 shown in Figure 2 as shown in Figure 4 comprises a laser instrument 200 and a single fiber adapter 300, and optoisolator 100 is on the primary optic axis between laser instrument 200 and the single fiber adapter 300 smooth end faces.The incident light forward of laser instrument 200 emissions is through behind the optoisolator 100; Reenter the light end face output that is incident upon single fiber adapter 300; And the light that the light end face reflection is returned is because the isolation backlight effect of optoisolator 100; It is normal can not influence laser instrument 200, thereby satisfies the high-speed light emitting module serviceability.

The light transmit-receive integrated assembly BOSA of single fiber bi-directional with optoisolator 100 shown in Figure 2 as shown in Figure 5; Comprise a laser instrument 200, an optical receiver 400 and a single fiber adapter 300; Optoisolator 100 is on the primary optic axis between laser instrument 200 and the single fiber adapter 300 smooth end faces; Optical receiver 400 is positioned on second optical axis, and this second optical axis is vertical with primary optic axis.At first successively principle of work and Fig. 4 of the forward light of the light end face output through optoisolator 100, single fiber adapter 300 is identical for laser instrument 200 transmitting downstream light signals, does not repeat at this.Second optical axis is incident to optical receiver 400 through the edge, optical filter 30 reflection back of optoisolator 100 and from the uplink optical signal of the light surface feeding sputtering of single fiber adapter 300.Adopt the light transmit-receive integrated assembly BOSA of single fiber bi-directional of this structure, just can satisfy the high-isolation requirement of the passive net optical line terminal of high speed.

Claims

1. an optoisolator (100) is characterized in that, along being provided with successively on the forward light incident light axis: a polarizer (10), a Faraday device (20) and an optical filter (30), this optical filter (30) is an angle theta with said incident light optical axis.

2. optoisolator as claimed in claim 1 (100) is characterized in that, said angle theta is 45 °.

3. one kind contains the optical assembly of optoisolator (100) according to claim 1 or claim 2; It is characterized in that; Comprise a laser instrument (200) and a single fiber adapter (300), said optoisolator (100) is positioned on the primary optic axis between said laser instrument (200) and single fiber adapter (300) the light end face.

4. one kind contains the optical assembly of optoisolator (100) according to claim 1 or claim 2; It is characterized in that; Comprise a laser instrument (200), an optical receiver (400) and a single fiber adapter (300); Said optoisolator (100) is positioned on the primary optic axis between said laser instrument (200) and single fiber adapter (300) the light end face, and said optical receiver (400) is positioned on second optical axis, and this second optical axis is vertical with said primary optic axis.