CN208795949U

CN208795949U - A kind of optical circulator

Info

Publication number: CN208795949U
Application number: CN201820632802.8U
Authority: CN
Inventors: 徐云兵; 李阳; 潘忠灵; 周健
Original assignee: Photop Technologies Inc
Current assignee: Photop Technologies Inc
Priority date: 2018-04-28
Filing date: 2018-04-28
Publication date: 2019-04-26
Anticipated expiration: 2028-04-28

Abstract

The utility model discloses a kind of optical circulators, including the first PBS combined prism being set in sequence along optical path, Faraday rotator and the 2nd PBS combined prism, the PBS that the first PBS combined prism is oppositely arranged by two is formed, the 2nd PBS combined prism is oppositely arranged by PBS and high reflective mirror or a PBS, half-wave plate is additionally provided between the first PBS combined prism and Faraday rotator or between Faraday rotator and the 2nd PBS combined prism, the structure forms 3 ports, wherein, the light of port 1 is exported after optical circulator by port 2, the light of port 2 is exported after circulator by port 3, the utility model is designed using free space micro-optics principle, component number is few, it is simple and compact for structure, it is easily integrated one, it can be extensive Applied in High Speeding Optical Transmitter-receiver Circuit, have a good application prospect.

Description

A kind of optical circulator

Technical field

The utility model relates to optical communication device field, especially a kind of optical circulator.

Background technique

Optical circulator is the important optical passive component in optical communication field, and traditional fiber optical circulator mainly uses birefringent crystalline substance Body is as beam splitter, due to the light splitting limited angle of birefringece crystal, so that the length of birefringece crystal is generally partially long, simultaneously Due to circulator structures complexity, number of elements is numerous, so that traditional circulator volume is relatively large, is difficult circulator and its Its optical device or module are integrated together, and are generally used as individual optical device and other optical devices or module and are connected by optical fiber It connects, so that the huge structure and complexity of entire optical fiber link.

Recently as the increasingly developed of communication field, the optical device and module number for needing to use are more and more, light device The integration and miniaturization of part becomes inevitable trend, especially in High Speeding Optical Transmitter-receiver Circuit, in order to reduce the complexity of link Property, need to be realized the transfer function of single fiber bi-directional with optical circulator, since optical module is large number of, external fiber optical circulator is not only It will increase biggish volume, cost is also higher.

Summary of the invention

The case where for the prior art, it is simple, small in size and be easy to that the purpose of this utility model is to provide a kind of structures The optical circulator of the integrated free space being assembled to inside optical module.

In order to realize above-mentioned technical purpose, the technical solution adopted in the utility model are as follows:

A kind of optical circulator comprising the first PBS combined prism, the Faraday rotator and second being set in sequence along optical path PBS combined prism, the PBS that the first PBS combined prism is oppositely arranged by two are formed, and the 2nd PBS combines rib Mirror is oppositely arranged by PBS and high reflective mirror or a PBS, and the first PBS combined prism and faraday are revolved Turn between device or Faraday rotator and the 2nd PBS combined prism between be additionally provided with half-wave plate.

Further, the first PBS combined prism, Faraday rotator, half-wave plate and the 2nd PBS combined prism be according to Sequence setting.

Further, the first PBS combined prism, half-wave plate, Faraday rotator and the 2nd PBS combined prism be according to Sequence setting.

Further, 45 ° of the polarization direction rotation for the light that the Faraday rotator is used to pass through from it, described half The optical axis of wave plate and the angle of side are 22.5 or 67.5 degree, are set as needed, and light polarization direction is also rotated 45 by it Degree.

Further, the polarization direction for the light that the half-wave plate is used to pass through from it rotates 45 °.

Further, the utility model structure forms three-port circulator, and the incident light of middle port 1 is single linear polarization The incident light of light, port 2 does not limit polarization state.

Further, the Faraday rotator is latching type Faraday rotator.

Further, the Faraday rotator is non-latching type Faraday rotator, the non-latching One or more magnetic patch or magnet ring are provided on the outside of type Faraday rotator.

Further, the first PBS combined prism, Faraday rotator, half-wave plate and the 2nd PBS combined prism are deep Change optical cement to be connected as one.

Further, the first PBS combined prism, Faraday rotator, half-wave plate and the 2nd PBS combined prism are glue Close be connected as one and gluing used in refractive index and the refractive index of corresponding mating surface of glue match correspondence.

Using above-mentioned structure, compared with prior art, the optical path of the utility model is simple, it is compact-sized, be easily assembled, Not only there is good optical property, but also be able to achieve low cost, in addition, can be collected due to the utility model volume very little Space and the cost of module-external connection circulator are saved at optical module inside is assembled to.

Detailed description of the invention

The utility model is further elaborated with reference to the accompanying drawings and detailed description:

Fig. 1 is that the implementation structure of the utility model optical circulator embodiment 1 and its forward direction pass light schematic diagram；

Implementation structure and its reversed biography light schematic diagram of the Fig. 2 for the utility model optical circulator embodiment 1；

Fig. 3 is the schematic three dimensional views when implementation structure of the utility model optical circulator embodiment 1 is combined as a whole；

Fig. 4 is that the implementation structure of the utility model optical circulator embodiment 2 and its forward direction pass light schematic diagram；

Implementation structure and its reversed biography light schematic diagram of the Fig. 5 for the utility model optical circulator embodiment 2；

Fig. 6 is a wherein application schematic diagram for the utility model optical circulator.

Specific embodiment

Embodiment 1

As shown in the figures 1 and 2, the present embodiment includes the first PBS combined prism 10, the Faraday rotation being set in sequence along optical path Device 11, half-wave plate 12 and the 2nd PBS combined prism 13, what the first PBS combined prism 10 was oppositely arranged by two PBS101,102 compositions, the 2nd PBS combined prism 13 is by PBS131 and high reflective mirror 132 or a PBS phase To being arranged, the formation of the present embodiment structure is used to input or three ports of output light, end respectively shown in fig. 1 or fig. 2 Mouth 1, port 2 and port 3.

Fig. 1 shows the positive of the present embodiment and passes light light path schematic diagram, the single linearly polarized light (P light) incident from port 1 Enter Faraday rotator 11 after the PBS101 of the first PBS combined prism 10, Faraday rotator 11 is inclined by incident P light Vibration direction rotates 45 degree and enters half-wave plate 12, and half-wave plate 12 along reversely rotating 45 degree, enters the polarization direction of incident light in this way Light is penetrated before entering the 2nd PBS combined prism 13 and has become P light again, from end after the PBS131 of the 2nd PBS combined prism 13 Mouth 2 is emitted.

Fig. 2 shows the reversed biography light light path schematic diagram of the present embodiment, the backward beam (P Guang &S light) incident from port 2 P light and S light are separated after the PBS131 of the 2nd PBS combined prism 13, P light level is transferred into half-wave plate 12, half-wave plate 12 will enter Faraday rotator 11 after 45 degree of light polarization rotation, and Faraday rotator 11 is by incident light polarization state along half-wave 45 degree of rotation is continued in the identical direction of rotation of piece 12, and such light beam becomes S light before entering the first PBS combined prism 10, the S Light is reflected to PBS102 after entering PBS101, exports after PBS102 reflects from port 3.The backward beam S incident from port 2 Light is reflected to PBS or high reflection mirror 132 after the PBS131 of the 2nd PBS combined prism 13, and S light is through PBS or high reflection mirror Half-wave plate 12 is transferred into after 132 reflections, half-wave plate 12 enters Faraday rotator 11, method after light polarization is rotated 45 degree Draw rotator 11 that incident light polarization state is continued 45 degree of rotation along the identical direction of rotation of half-wave plate 12, such light beam is entering Become P light before first PBS combined prism 10, transmission is exported from port 3 after which enters PBS102.It is incident from port 2 in this way Backward beam (P Guang &S light) after optical circulator from port 3 export.

Wherein, in the implementation structure (Fig. 1 or Fig. 2) of the present embodiment, the position of Faraday rotator 11 and half-wave plate 12 can Mutually to turn (i.e. the position of Faraday rotator 11 and half-wave plate 12 can be exchanged), the optical axis of half-wave plate 12 and the angle of side are It 22.5 or 67.5 degree, is set as needed, light polarization direction is also rotated 45 degree by it.

Fig. 3 is schematic three dimensional views when the present embodiment implementation structure is combined as a whole, and passes through in-depth optical cement or light refraction Rate matching glue can connect the first PBS combined prism 10, Faraday rotator 11, half-wave plate 12 and the 2nd PBS combined prism 13 It is connected together to form an assembly, forms a compact structure, further, the first PBS combined prism 10, Faraday rotation When device 11, half-wave plate 12 and the 2nd PBS combined prism 13 are connected as one for gluing, the refractive index of glue used in gluing is tied with corresponding The refractive index for closing surface matches correspondence.

Embodiment 2

As shown in fig. 4 or 5, the present embodiment includes the first PBS combined prism 20, the Faraday rotation being set in sequence along optical path Device 21, half-wave plate 22 and the 2nd PBS combined prism 23, what the first PBS combined prism 20 was oppositely arranged by two PBS201,202 compositions, the 2nd PBS combined prism 23 is by PBS231 and high reflective mirror 232 or a PBS phase To being arranged, the formation of the present embodiment structure is used to input or three ports of output light, respectively Fig. 4 or end shown in fig. 5 Mouth 1, port 2 and port 3.

Fig. 4 shows the positive biography light schematic diagram that the present embodiment implements structure, the single linearly polarized light (P incident from port 1 Light) enter Faraday rotator 21 after the PBS201 of the first PBS combined prism 20, Faraday rotator 21 is by incident P Light polarization direction rotates 45 degree and enters half-wave plate 22, and the polarization direction of incident light is rotated 45 by half-wave plate 22 in same direction Degree, such incident light enter the 2nd PBS combined prism 23 before become S light, by the 2nd PBS combined prism 23 PBS or Enter PBS232 after high reflection mirror 231, which is emitted after PBS232 reflects from port 2.

Fig. 5 is the reversed biography light schematic diagram that the present embodiment implements structure, the backward beam (P Guang &S light) incident from port 2 Say that P light and S light separate after the PBS232 of the 2nd PBS combined prism 23, P light level is transferred into half-wave plate 22, half-wave plate 22 will enter Faraday rotator 21 after 45 degree of light polarization rotation, and Faraday rotator 21 is by incident light polarization state along half-wave The opposite direction of piece 22 rotates 45 degree, and such light beam remains as P light before entering the first PBS combined prism 20, which enters It is transmitted after PBS201 and is exported from port 3.The backward beam S light incident from port 2 is by the 2nd PBS combined prism 23 PBS or high reflection mirror 231 are reflected to after PBS232, S light is transferred into half-wave plate 22 after PBS or high reflection mirror 231 reflect, Half-wave plate 22 will light polarization rotate 45 degree after into Faraday rotator 21, Faraday rotator 21 is by incident light polarization state 45 degree are rotated along the opposite direction of half-wave plate 22, such light beam remains as S light before entering the first PBS combined prism 20, the S Light is reflected into PBS202 after entering PBS201, exports after PBS202 reflects from port 3.In this way from 2 incidence of port Backward beam (P Guang &S light) is exported from port 3 after optical circulator.

Wherein, in the implementation structure (Fig. 4 or Fig. 5) of the present embodiment, the position of Faraday rotator 21 and half-wave plate 22 can To exchange, the optical axis of half-wave plate 22 and the angle of side are 22.5 or 67.5 degree, are set as needed, it is also by light polarization Direction rotates 45 degree, can be by way of in-depth optical cement or light refractive index match glue by the first PBS combined prism 20, farad Rotator 21, half-wave plate 22 and the 2nd PBS combined prism 23 are joined together to form an assembly, formed one it is compact Structure, the first PBS combined prism 20, Faraday rotator 21, half-wave plate 22 and the 2nd PBS combined prism 23 are connected as gluing It is integrally that refractive index and the refractive index of corresponding mating surface of glue used in gluing match correspondence.

In addition, the Faraday rotator 21 can be latching type Faraday rotator or non-latching type method Draw rotator, wherein one or more magnetic patch or magnet ring are provided on the outside of non-latching type Faraday rotator, to provide Required magnetic field.

Embodiment 3

Fig. 6 is optical circulator Application Example schematic diagram described in the utility model, ring of light row described in the utility model Device can be applied in the optical module of single fiber bi-directional transmission, which includes laser (LD) array or discrete lasers group 30, wave Division multiplexer (MUX) 31, the optical circulator 32 of the utility model, optical interface 33, Wave decomposing multiplexer (DEMUX) 34, photoelectricity are visited Survey device (PD) array or discrete photodetector group 35 and shell 36；The working principle of the module is: multipath light signal via Laser array or discrete lasers group 30 issue, and per a laser is corresponded to all the way, each laser corresponds to a wavelength, no The multiple signals of co-wavelength have synthesized signal all the way through wavelength division multiplexer 31, then the signal via the utility model ring of light row The port 1 of device 32 inputs, and exports after exporting from port 2 from the optical interface 33 of module.On the other hand, the signal of the multi-wavelength of input Optical interface 33 through module inputs, and the port 2 through optical circulator 32 enters, and is output and then enter Wave decomposing multiplexer 34 from port 3, Wave decomposing multiplexer 34 will be transferred to photodetector array or discrete photodetector group 35 per the signal of corresponding wavelength all the way In each corresponding photodetector.The transmitted in both directions function of module optical signal is thus realized with single optical interface, Since the optical circulator 32 of the utility model is simple and compact for structure, it is desirably integrated into optical module, is assembled to optical module shell 36 Inside, realize the miniaturization of optical module.

It should be noted that the deformation and change of embodiments disclosed herein be it is possible, for those this fields The replacement of embodiment and equivalent various parts are well known for those of ordinary skill.It should be clear to a person skilled in the art that Be, in the case where not departing from the spirit or essential characteristics of the utility model, the utility model can in other forms, structure, Arrangement, ratio are realized.

Claims

1. a kind of optical circulator, it is characterised in that: it includes the first PBS combined prism being set in sequence along optical path, faraday's rotation Turning device and the 2nd PBS combined prism, the PBS that the first PBS combined prism is oppositely arranged by two is formed, and described second PBS combined prism is oppositely arranged by PBS and high reflective mirror or a PBS, the first PBS combined prism with Half-wave plate is additionally provided between Faraday rotator or between Faraday rotator and the 2nd PBS combined prism；The first PBS group The port I and port III that conjunction prism is inputted or exported for optical signal far from the end face formation of Faraday rotator, described second PBS combined prism forms the port II for inputting or exporting for optical signal far from the end face of Faraday rotator, wherein port I Opposite with the PBS on the first PBS combined prism top, port III is opposite with the PBS of the first PBS combined prism lower part；Port I inputs Optical signal sequentially via the first PBS combined prism, Faraday rotator, half-wave plate and the 2nd PBS combined prism after, from port II output, the optical signal that port II inputs is sequentially via the 2nd PBS combined prism, half-wave plate, Faraday rotator and the first PBS After combined prism, exported from port III.

2. a kind of optical circulator according to claim 1, it is characterised in that: the first PBS combined prism, faraday Rotator, half-wave plate and the 2nd PBS combined prism are to be set in sequence.

3. a kind of optical circulator according to claim 1, it is characterised in that: the first PBS combined prism, half-wave Piece, Faraday rotator and the 2nd PBS combined prism are to be set in sequence.

4. a kind of optical circulator according to claim 1, it is characterised in that: the Faraday rotator is used for will be from it By light polarization direction rotate 45 °.

5. a kind of optical circulator according to claim 1, it is characterised in that: the half-wave plate is used to pass through from it The polarization direction of light rotates 45 °.

6. a kind of optical circulator according to claim 1, it is characterised in that: the Faraday rotator is latching Type Faraday rotator.

7. a kind of optical circulator according to claim 1, it is characterised in that: the Faraday rotator is non- Latching type Faraday rotator, the non-latching type Faraday rotator outside are provided with one or more magnetic patch Or magnet ring.

8. a kind of optical circulator according to claim 1, it is characterised in that: the first PBS combined prism, faraday Rotator, half-wave plate and the 2nd PBS combined prism are that in-depth optical cement is connected as one.

9. a kind of optical circulator according to claim 1, it is characterised in that: the first PBS combined prism, faraday Rotator, half-wave plate and the 2nd PBS combined prism be gluing be connected as one and gluing used in glue refractive index with it is corresponding combination The refractive index on surface matches correspondence.