CN-121978799-A - Multilayer waveguide ring with quadrupole symmetrical structure

CN121978799ACN 121978799 ACN121978799 ACN 121978799ACN-121978799-A

Abstract

The invention discloses a multilayer waveguide ring with a four-pole symmetrical structure, which adopts an interlayer coupler to expand the waveguide structure from two dimensions to three dimensions, greatly increases the optical path length of the waveguide ring by increasing the number of optical waveguide layers under small dimensions, realizes the high precision of an integrated optical gyroscope under small volumes, realizes the four-pole symmetrical structure in the waveguide ring, and effectively inhibits Shupe noise. The waveguide ring for the interference type integrated optical gyroscope solves the problems that after the length of the waveguide ring for the existing interference type integrated optical gyroscope is greatly increased through an interlayer coupler, the waveguide ring is easily affected by Shupe noise caused by temperature gradient, and the accuracy improvement of the gyroscope is limited.

Inventors

WANG QIWEI
PEI ZIYAN
HE ZEMIN
LIU QI
MA GUANYING

Assignees

北京控制工程研究所

Dates

Publication Date: 20260505
Application Date: 20260114

Claims (7)

1. The waveguide ring unit with the four-pole symmetrical structure is characterized by comprising 4 single-layer waveguide rings, 3 interlayer couplers and 2 sections of input/output optical waveguides, wherein the 4 single-layer waveguide rings are marked as a first single-layer waveguide ring, a second single-layer waveguide ring, a third single-layer waveguide ring and a fourth single-layer waveguide ring, the 3 interlayer couplers are marked as a first interlayer coupler, a second interlayer coupler and a third interlayer coupler, and the 2 sections of input/output optical waveguides are marked as a first input/output optical waveguide and a second input/output optical waveguide; The second single-layer waveguide ring is connected with the third single-layer waveguide ring through the first interlayer coupler, the third single-layer waveguide ring is connected with the fourth single-layer waveguide ring through the second interlayer coupler, the fourth single-layer waveguide ring is connected with the first single-layer waveguide ring through the third interlayer coupler, the first single-layer waveguide ring is connected with the first input/output optical waveguide, and the second single-layer waveguide ring is connected with the second input/output optical waveguide.
2. A waveguide ring unit having a four-pole symmetrical structure as set forth in claim 1, wherein when the first input/output optical waveguide is a clockwise optical input and a counterclockwise optical output port, the second input/output optical waveguide is a clockwise optical output and a counterclockwise optical input port; When the second input/output optical waveguide is a clockwise optical input and a counter-clockwise optical output port, the first input/output optical waveguide is a clockwise optical output and a counter-clockwise optical input port.
3. The waveguide ring unit with the four-pole symmetrical structure according to claim 1, wherein the waveguide ring unit is characterized in that the waveguide ring unit is in an adjacent single-layer waveguide ring after the same transmission time regardless of clockwise input light or anticlockwise input light, so that the influence of temperature gradient on gyro precision is effectively reduced.
4. The waveguide ring unit with the four-pole symmetrical structure according to claim 1, wherein the first single-layer waveguide ring, the second single-layer waveguide ring, the third single-layer waveguide ring and the fourth single-layer waveguide ring are all of a multi-loop structure and have the same number of loops.
5. A multilayer waveguide ring with a four-pole symmetrical structure is characterized by comprising M groups of waveguide ring units according to claim 1; The m group of waveguide rings of the multilayer waveguide ring comprises a 4m-3 single-layer waveguide ring, a 4m-2 single-layer waveguide ring, a 4m-1 single-layer waveguide ring, a 4m single-layer waveguide ring, an m-1 interlayer coupler, an m-4 interlayer coupler and an m-2 interlayer coupler, wherein the m-2 interlayer coupler and the m-3 interlayer coupler are formed by the adjacent group of waveguide rings; the 4m-1 single-layer waveguide ring is connected with the 4m-2 single-layer waveguide ring through an m-4 interlayer coupler; the M group waveguide ring is respectively adjacent to the k group waveguide ring and the n group waveguide ring, wherein the 4M single-layer waveguide ring is connected with the 4k-3 single-layer waveguide ring through an M-2 interlayer coupler, the 4M-1 single-layer waveguide ring is connected with the 4k-2 single-layer waveguide ring through an M-3 interlayer coupler, the 4n single-layer waveguide ring is connected with the 4M-3 single-layer waveguide ring through an n-2 interlayer coupler, the 4n-1 single-layer waveguide ring is connected with the 4M-2 single-layer waveguide ring through an n-3 interlayer coupler, and the m=1, 2, 3. Specifically, when m=1, i.e. the first group of waveguide rings, the 0-3 th and 0-2 th interlayer couplers are replaced by the input/output optical waveguides, and when m=m, i.e. the M group of waveguide rings, the M-2 nd and M-3 rd interlayer couplers form a complete interlayer coupler, and the clockwise optical waveguide and the anticlockwise optical waveguide are connected.
6. The multilayer waveguide ring with four-pole symmetry according to claim 5, wherein the M groups of waveguide rings with four-pole symmetry increase the waveguide ring length by 4M times and the theoretical limit accuracy of the gyroscope by 4M times under the same area.
7. The multilayer waveguide ring with four-pole symmetry according to claim 5, wherein the single-layer waveguide rings in each group are multi-turn loop structures and the number of single-layer waveguide rings in all groups is the same.

Description

Multilayer waveguide ring with quadrupole symmetrical structure Technical Field The invention belongs to the technical field of optical gyro design, and relates to a multilayer waveguide ring with a four-pole symmetrical structure for an integrated optical gyro. Background In the current research process of the interferometric integrated optical gyroscope, the waveguide ring is usually in a single-layer structure, and the change of the temperature gradient in the waveguide ring can cause nonreciprocal noise between light transmitted in the clockwise direction and the counterclockwise direction, so as to influence the detection precision of the interferometric integrated optical gyroscope, and the noise is called Shupe noise, and the influence of the noise is more remarkable along with the increase of the length of the waveguide ring and the improvement of the precision of the interferometric optical gyroscope. Therefore, after the waveguide ring structure is longitudinally expanded by adopting the interlayer coupler, the interlayer arrangement of the optical waveguides in the waveguide ring needs to be focused, so that the detection precision of the gyroscope is improved. Disclosure of Invention The invention solves the technical problems of overcoming the defects of the prior art, providing a multilayer waveguide ring with a four-pole symmetrical structure, and solving the problems that the waveguide ring for the existing interference type integrated optical gyroscope is easily influenced by Shupe noise caused by temperature gradient after the length of the ring is greatly increased by an interlayer coupler, and the precision improvement of the gyroscope is limited. The solution of the invention is as follows: The waveguide ring unit with the four-pole symmetrical structure comprises 4 single-layer waveguide rings, 3 interlayer couplers and 2 sections of input/output optical waveguides, wherein the 4 single-layer waveguide rings are marked as a first single-layer waveguide ring, a second single-layer waveguide ring, a third single-layer waveguide ring and a fourth single-layer waveguide ring, the 3 interlayer couplers are marked as a first interlayer coupler, a second interlayer coupler and a third interlayer coupler, and the 2 sections of input/output optical waveguides are marked as a first input/output optical waveguide and a second input/output optical waveguide; The second single-layer waveguide ring is connected with the third single-layer waveguide ring through the first interlayer coupler, the third single-layer waveguide ring is connected with the fourth single-layer waveguide ring through the second interlayer coupler, the fourth single-layer waveguide ring is connected with the first single-layer waveguide ring through the third interlayer coupler, the first single-layer waveguide ring is connected with the first input/output optical waveguide, and the second single-layer waveguide ring is connected with the second input/output optical waveguide. Preferably, when the first input/output optical waveguide is a clockwise optical input and a counterclockwise optical output port, the second input/output optical waveguide is a clockwise optical output and a counterclockwise optical input port; When the second input/output optical waveguide is a clockwise optical input and a counter-clockwise optical output port, the first input/output optical waveguide is a clockwise optical output and a counter-clockwise optical input port. Preferably, the light is input clockwise or anticlockwise, and the light is in the adjacent single-layer waveguide ring after the same transmission time, so that the influence of the temperature gradient on the gyro precision is effectively reduced. Preferably, the first single-layer waveguide ring, the second single-layer waveguide ring, the third single-layer waveguide ring and the fourth single-layer waveguide ring are all in a multi-loop structure, and the loops are the same. A multilayer waveguide ring with a four-pole symmetrical structure comprises M groups of waveguide ring units; The m group of waveguide rings of the multilayer waveguide ring comprises a 4m-3 single-layer waveguide ring, a 4m-2 single-layer waveguide ring, a 4m-1 single-layer waveguide ring, a 4m single-layer waveguide ring, an m-1 interlayer coupler, an m-4 interlayer coupler and an m-2 interlayer coupler, wherein the m-2 interlayer coupler and the m-3 interlayer coupler are formed by the adjacent group of waveguide rings; the 4m-1 single-layer waveguide ring is connected with the 4m-2 single-layer waveguide ring through an m-4 interlayer coupler; the M group waveguide ring is respectively adjacent to the k group waveguide ring and the n group waveguide ring, wherein the 4M single-layer waveguide ring is connected with the 4k-3 single-layer waveguide ring through an M-2 interlayer coupler, the 4M-1 single-layer waveguide ring is connected with the 4k-2 single-layer waveguide ring through an M-3 interlaye