CN211528853U

CN211528853U - Miniature optical circulator

Info

Publication number: CN211528853U
Application number: CN202020021744.2U
Authority: CN
Inventors: 邹支农
Original assignee: Suzhou Tfc Optical Communication Co ltd
Current assignee: Suzhou Tfc Optical Communication Co ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-09-18
Anticipated expiration: 2030-01-07

Abstract

The utility model relates to a miniature optical circulator, including a first polarization beam splitter, a Faraday rotator, a half wave plate and the second polarization beam splitter that sets gradually, first polarization beam splitter with the second polarization beam splitter is the isosceles right triangle structure, first polarization beam splitter is equipped with a first right-angle side and a second right-angle side, the second polarization beam splitter is equipped with a third right-angle side and a fourth right-angle side, first right-angle side is close to Faraday rotator sets up, the third right-angle side is close to the half wave plate sets up. The utility model relates to a miniature optical circulator has advantages such as miniaturation, homonymy input/output and heteronymy input/output conversion.

Description

Miniature optical circulator

Technical Field

The utility model relates to an optical communication technical field, especially a miniature optical circulator.

Background

An optical circulator is a multi-port optical device with nonreciprocal characteristics. When an optical signal is input from any one port, it can be output from the next port in digital sequence with little loss, and the loss of the port to all other ports is large, so that the port is not communicated. The non-reciprocity of the optical circulator makes it an important device in bidirectional communication, which can accomplish the separation task of forward/reverse transmission. The optical circulator has wide application in the fields of single-fiber bidirectional communication, up/down telephone channels, combined/divided wave, dispersion compensation and the like in optical communication.

The technical indexes of the optical circulator include insertion loss, isolation, crosstalk, polarization dependent loss, polarization mode dispersion, return loss and the like. The definitions of the insertion loss, isolation, polarization dependent loss and polarization mode dispersion of the optical circulator are basically the same as those of the optical isolator, except that for the circulator, the definitions refer to specific indexes between two adjacent ports, such as the insertion loss between the ports. The crosstalk of the optical circulator refers to a relative value between two non-adjacent ports, which theoretically cannot receive an optical signal but actually receives power expressed in dB for various reasons, for example, when a port inputs a signal, the existing design cannot realize the flexibility of changing input and output at the same side and different sides through structural transformation at the dB value of the power received by the port relative to the input power.

To this end, we have developed a micro optical circulator to solve the above disadvantages.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the deficiency of the prior art and providing a miniature optical circulator, has advantages such as miniaturation, homonymy input/output and heteropolarity input/output conversion.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a miniature optical circulator, is including a first polarization beam splitter, a Faraday rotator, a half wave plate and the polarization beam splitter of second that sets gradually, first polarization beam splitter with the polarization beam splitter of second is the isosceles right triangle structure, first polarization beam splitter is equipped with a first right angle limit and a second right angle limit, second polarization beam splitter is equipped with a third right angle limit and a fourth right angle limit, first right angle limit is close to Faraday rotator sets up, the third right angle limit is close to the half wave plate sets up.

Preferably, the first polarization beam splitter is formed by bonding a first 45 ° dove prism and a first 45 ° right-angle prism, and the first 45 ° dove prism and the first 45 ° right-angle prism form an isosceles right-angle triangle structure.

Preferably, the second polarization beam splitter is formed by bonding a second 45 ° dove prism and a second 45 ° right-angle prism, and the second 45 ° dove prism and the second 45 ° right-angle prism form an isosceles right-angle triangle structure.

Preferably, the second right-angle side is connected to a second port and a fourth port, and the second port and the fourth port are arranged in parallel.

Preferably, the fourth right-angle side is connected to a first port and a third port, and the first port and the third port are arranged in parallel.

Preferably, the first port is arranged in parallel with the second port.

Preferably, the second port, the fourth port, the first port and the third port are disposed on the same side, or the second port, the fourth port, the first port and the third port are disposed on different sides.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

miniature optical circulator can adjust the transform of homonymy input/output and different side in a flexible way according to the demand on the basis of same raw and other materials and cost to and miniature optical circulator design.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1

In fig. 1, a micro optical circulator includes a first Polarization Beam Splitter (PBS), a faraday rotator 30, a half-wave plate 40 and a second PBS sequentially disposed.

The first polarization beam splitter and the second polarization beam splitter are of an isosceles right triangle structure, and the first polarization beam splitter is formed by bonding a first 45-degree dove prism 10 and a first 45-degree right-angle prism 20. The first 45-degree dove prism 10 and the first 45-degree right-angle prism 20 form an isosceles right-angle triangular structure, and the second polarization beam splitter is formed by bonding a second 45-degree dove prism 60 and a second 45-degree right-angle prism 50. The second 45-degree dove prism 60 and the second 45-degree right-angle prism 50 form an isosceles right-angle triangle structure.

First polarization beam splitter is equipped with a first right-angle side 201 and a second right-angle side 202, second right-angle side 202 is connected to second port 2 and fourth port 4, second port 2 and fourth port 4 parallel arrangement, second polarization beam splitter is equipped with a third right-angle side 501 and a fourth right-angle side 502, fourth right-angle side 502 is connected to first port 1 and third port 3, first port 1 and third port 3 parallel arrangement, first right-angle side 201 is close to faraday rotator 30 and sets up, third right-angle side 501 is close to half-wave plate 40 and sets up.

The second port 2, the fourth port 4, the first port 1 and the third port 3 are arranged on the same side in parallel, and the second leg 202 and the fourth leg 502 are arranged on the same side.

Light enters from the first port 1, passes through the first polarization beam splitter, the Faraday rotator 30, the half-wave plate 40 and the second polarization beam splitter and then is output from the second port 2; the light entering from the second port 2 passes through the first polarization beam splitter, the Faraday rotator 30, the half-wave plate 40 and the second polarization beam splitter and then is output from the third port 3; light entering from the third port 3 passes through the first polarization beam splitter, the Faraday rotator 30, the half-wave plate 40 and the second polarization beam splitter and then is output from the fourth port 4; light (not shown in the drawing) entering from the fourth port 4 passes through the first polarization beam splitter, the faraday rotator 30, the half-wave plate 40, and the second polarization beam splitter and then is output from the first port 1.

Example 2

In fig. 2, a micro optical circulator includes a first Polarization Beam Splitter (PBS), a faraday rotator 30, a half-wave plate 40 and a second PBS sequentially disposed.

The second port 2, the fourth port 4, the first port 1 and the third port 3 are arranged in parallel at different sides, and the second right-angle side 202 and the fourth right-angle side 502 are arranged at different sides.

The above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. A kind of miniature optical circulator, characterized by: including a first polarization beam splitter, a Faraday rotator, a half wave plate and the polarization beam splitter of second that sets gradually, first polarization beam splitter with the polarization beam splitter of second is the isosceles right triangle structure, first polarization beam splitter is equipped with a first right angle limit and a second right angle limit, second polarization beam splitter is equipped with a third right angle limit and a fourth right angle limit, first right angle limit is close to Faraday rotator sets up, third right angle limit is close to the half wave plate sets up.

2. The miniature optical circulator of claim 1, wherein the first polarizing beam splitter comprises a first 45 ° dove prism bonded to a first 45 ° right angle prism, and the first 45 ° dove prism and the first 45 ° right angle prism form an isosceles right triangle structure.

3. The miniature optical circulator of claim 2, wherein the second polarizing beam splitter comprises a second 45 ° dove prism bonded to a second 45 ° right-angled prism, and the second 45 ° dove prism and the second 45 ° right-angled prism form an isosceles right-angled triangle structure.

4. The miniature optical circulator of claim 1, wherein the second leg-edge is connected to a second port and a fourth port, the second port and the fourth port being disposed in parallel.

5. The miniature optical circulator of claim 4 wherein the fourth cathetus is connected to a first port and a third port, the first port and the third port being disposed in parallel.

6. The miniature optical circulator of claim 5 wherein the first port is disposed parallel to the second port.

7. The miniature optical circulator of claim 6 wherein the second port, the fourth port, the first port and the third port are disposed on the same side or the second port, the fourth port, the first port and the third port are disposed on different sides.