CN216927152U

CN216927152U - Four-channel free space optical circulator for data center

Info

Publication number: CN216927152U
Application number: CN202220380584.XU
Authority: CN
Inventors: 李理想
Original assignee: Suzhou Donghui Optical Co ltd
Current assignee: Innolight Technology Suzhou Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-07-08
Anticipated expiration: 2032-02-24

Abstract

The utility model discloses a four-channel free space optical circulator of a data center, which is sequentially provided with a first polarization beam splitter prism, a quartz wave plate, a magnet and a second polarization beam splitter prism from left to right, wherein the first polarization beam splitter prism comprises two first polarization beam splitter prism units which are arranged up and down, a first PBS (polarizing beam splitter) film is arranged between the two first polarization beam splitter prism units, two Faraday optical rotators which are arranged up and down are arranged in the magnet, the second polarization beam splitter prism comprises three second polarization beam splitter prism units which are arranged up and down, and a second PBS film is arranged between the adjacent second polarization beam splitter prism units; through the mode, one path of incident light is added on the structural function, and the number of channels of the free space optical circulator is increased to four channels with the minimum design cost.

Description

Four-channel free space optical circulator for data center

Technical Field

The utility model relates to the technical field of optics, in particular to a four-channel free space optical circulator for a data center.

Background

The free space optical circulator is a passive optical device applied to an optical module of a 400G data center, and mainly has the functions of realizing polarization beam splitting and light mixing (polarization beam splitting film action, polarization P light transmission and polarization S light reflection) through a polarization beam splitting film of a two-stage polarization beam splitting prism, and achieving the purpose of directional output of an optical path through directional optical rotation of quartz and a Faraday optical rotator.

The optical module of the data center needs more channels and wavelengths to realize higher speed due to the speed limit of a single wavelength, and with the push-out of the optical module of the 800G data center, higher requirements are put forward on the number of channels of a single device, and the promotion of the number of channels of the free space optical circulator becomes more important; thus, a greater number of channels of automated spatial light circulators are yet to be developed.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing a four-channel free space optical circulator of a data center, and the number of channels of the free space optical circulator is increased from 3 channels to 3+1 channels by the design and optimization of the structure and with the minimum processing cost.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a data center four-channel free space optical circulator from left to right has set gradually first polarization beam splitter, quartz wave plate, magnet and second polarization beam splitter, first polarization beam splitter is provided with first PBS membrane including two first polarization beam splitter units that set up from top to bottom between the two, be provided with the Faraday optical rotation ware of two upper and lower settings in the magnet, second polarization beam splitter is including the three second polarization beam splitter unit that sets up from top to bottom, and is adjacent be provided with second PBS membrane between the second polarization beam splitter unit.

Preferably, the first polarization splitting prism is provided with a first antireflection film on both surfaces attached to the quartz wave plate and deviated from the quartz wave plate.

Preferably, the bottom surface of the first polarization splitting prism is set as a first polished surface.

Preferably, the top surface and the bottom surface of the second polarization splitting prism are both set as a second polished surface.

Preferably, the second polarization splitting prism is attached to the magnet, and the two surfaces of the second polarization splitting prism, which are away from the magnet, are provided with second antireflection films.

Preferably, the side faces of the quartz wave plate, which is attached to the first polarization splitting prism and the magnet, are provided with third antireflection films.

Preferably, the magnet is E-shaped, and the faraday rotator is disposed in the magnet.

Preferably, the thicknesses of the first antireflection film, the second antireflection film, and the third antireflection film are 0.5 um.

The utility model has the beneficial effects that: according to the four-channel free space optical circulator for the data center, the structure design is optimized, one path of incident light is functionally added under the condition that the total optical parts of the circulator are not increased, the number of channels of the free space optical circulator is increased to four channels with the minimum design cost, and the four-channel free space optical circulator has a very good market technology popularization value.

Drawings

FIG. 1 is a schematic diagram of a four-channel free space optical circulator of a data center according to the present invention;

FIG. 2 is a schematic diagram of a first polarization splitting prism according to the present invention;

FIG. 3 is a schematic diagram of a first polarization splitting prism according to the present invention;

FIG. 4 is a schematic view of the structure of the magnet of the present invention;

FIG. 5 is a schematic view of the optical path of the present invention;

the parts in the drawings are numbered as follows:

1. a first polarization splitting prism; 2. a quartz wave plate; 3. a magnet; 4. a second polarization beam splitter prism; 5. a first PBS membrane; 6. a Faraday rotator; 7. a second PBS film; 8. a first antireflection film; 9. a first polishing surface; 10. a second polished face; 11. a second antireflection film; 12. and a third antireflection film.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.

Example (b):

as shown in fig. 1, a four-channel free space optical circulator for a data center is provided with a first polarization beam splitter 1, a quartz wave plate 2, a magnet 3 and a second polarization beam splitter 4 from left to right in sequence, wherein the first polarization beam splitter 1 comprises two first polarization beam splitter units arranged up and down, a first PBS film 5 is arranged between the first polarization beam splitter and the second polarization beam splitter, the PBS film is a polarization beam splitter film, the polarization beam splitter film transmits polarized P light, reflects polarized S light, and realizes polarization beam splitting and light mixing through the polarization beam splitter film.

As shown in fig. 1, two faraday optical rotators 6 are arranged in the magnet 3, and the purpose of directional output of the optical path is achieved by directional optical rotation of the quartz wave plate 2 and the faraday optical rotators 6; the second polarization beam splitter prism 4 includes three second polarization beam splitter prism units arranged from top to bottom, a second PBS film 7 is arranged between the adjacent second polarization beam splitter prism units, and the second PBS film acts as the first PBS film.

As shown in fig. 1, 2 and 3, the first polarization splitting prism 1 is provided with a first antireflection film 8 on both surfaces attached to the quartz wave plate 2 and departing from the quartz wave plate 2, so as to ensure the light flux of the light path; the bottom surface of the first polarization splitting prism 1 is provided as a first polished surface 9 for ensuring total reflection of the optical path. The top surface and the bottom surface of the second polarization beam splitter prism 4 are both provided with a second polished surface 10, the two surfaces of the second polarization beam splitter prism 4, which are attached to the magnet 3 and depart from the magnet 3, are both provided with a second antireflection film 11, and the second polished surface and the second antireflection film have the same functions as the first polished surface and the first antireflection film.

As shown in fig. 1 and 4, the third antireflection film 12 is arranged on the side of the quartz wave plate 2, which is attached to the first polarization splitting prism 1 and the magnet 3, so as to ensure the light flux of the light path; the magnet 3 is E-shaped, and the Faraday optical rotator 6 is arranged in the magnet 3; the thicknesses of the first antireflection film 8, the second antireflection film 11, and the third antireflection film 12 are preferably 0.5 um.

As shown in fig. 1 and 5, the structure is designed to work according to the following principle:

1. the channel 11 is used as an input end, polarized P light is input, a light path is 100% reflected by a second polished surface at the bottom end of the second polarization beam splitter prism 4, is transmitted by the second PBS film 7 for two times, continues to be 100% reflected by the second polished surface at the top end of the second polarization beam splitter prism 4, still keeps the P light in a polarization state after passing through the Faraday optical rotator 6 and the quartz wave plate 2, and finally keeps the polarized P light to be output by the channel 2 after passing through the first polarization beam splitter prism 1;

2. the channel 12 is used as an input end, polarized S light is input, a light path is reflected by the second PBS film 7 of the second polarization beam splitter prism 4 twice, continues to pass through the Faraday optical rotator 6 and the quartz wave plate 2, keeps the polarization state of the S light, and finally is reflected by the first polishing surface 9 at the bottom end of the first polarization beam splitter prism 1 and the first PBS film 5, keeps the polarization S light output by the channel 2;

3. the channel 2 is used as an input end, natural light (P + S light) is input, a light path is subjected to polarization splitting after passing through a first PBS film 5 of a first polarization splitting prism 1 and then is divided into two paths, the first path of P light is transmitted and then is changed into S light after passing through a quartz wave plate 2 and a Faraday rotator 6, the second path of S light is reflected and is reflected on a first polishing surface 9 of the first polarization splitting prism 1 and then is changed into P light after passing through the quartz wave plate 2 and the Faraday rotator 6, the first path of P light is changed into S light and then is totally reflected by a second polishing surface 10 at the top end of a second polarization splitting prism 4, and the S light and the second path of P light are synthesized into a beam of second PBS film of the second polarization splitting prism 4 and finally are emitted from the channel 3;

according to the structural principle, the purpose that polarized light P is output by the channel 2 when polarized light P is input into the functional channel 11, polarized light S is output by the channel 2 when polarized light S is input into the channel 12, natural light input into the channel 2 is output by the channel 3, the natural light is still kept, the purpose of input and directional output of different channels is achieved, and the function of the four-channel free space optical circulator of the data center is achieved.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A four-channel free space optical circulator of a data center is characterized in that: from left to right, first polarization beam splitter (1), quartz wave plate (2), magnet (3) and second polarization beam splitter (4) have set gradually, two first polarization beam splitter units that first polarization beam splitter (1) set up about including are provided with first PBS membrane (5) between the two, be provided with Faraday optical rotation ware (6) that two set up from top to bottom in magnet (3), three second polarization beam splitter unit that second polarization beam splitter (4) set up about including is adjacent be provided with second PBS membrane (7) between the second polarization beam splitter unit.

2. The data center four-channel free space optical circulator of claim 1, wherein: and the first polarization splitting prism (1) is attached to the quartz wave plate (2) and two surfaces departing from the quartz wave plate (2) are provided with first antireflection films (8).

3. The data center four-channel free space optical circulator of claim 2, wherein: the bottom surface of the first polarization splitting prism (1) is set as a first polished surface (9).

4. The data center four-channel free space optical circulator of claim 1, wherein: and the top surface and the bottom surface of the second polarization splitting prism (4) are both set as second polished surfaces (10).

5. The data center four-channel free space optical circulator of claim 4, wherein: and the second polarization beam splitter prism (4) is attached to the magnet (3) and the two surfaces departing from the magnet (3) are provided with second antireflection films (11).

6. The data center four-channel free space optical circulator of claim 1, wherein: and the quartz wave plate (2) is attached to the side surfaces of the first polarization splitting prism (1) and the magnet (3) and is provided with a third antireflection film (12).

7. The data center four-channel free space optical circulator of claim 1, wherein: the magnet (3) is E-shaped, and the Faraday optical rotator (6) is arranged in the magnet (3).

8. The data center four-channel free-space optical circulator of claim 2, 5 or 6, wherein: the thicknesses of the first antireflection film (8), the second antireflection film (11) and the third antireflection film (12) are 0.5 um.