Search

CN-122001491-A - Optical fiber hydrophone array time delay combined structure

CN122001491ACN 122001491 ACN122001491 ACN 122001491ACN-122001491-A

Abstract

The application discloses an optical fiber hydrophone array delay combination structure which comprises an circulator, an optical fiber delay ring and an optical fiber reflecting end, wherein an incident port of the circulator is connected to the input side of an array total downlink optical fiber, a reflecting port is connected to the output side of the array total downlink optical fiber, a transmitting port is connected with one end of the optical fiber delay ring, and the optical fiber reflecting end is connected to the cut-off position of a tail fiber at the other end of the optical fiber delay ring. The optical fiber delay ring is wound by adopting a single-mode bare fiber of a matching array, the winding total length is half of the theoretical optical fiber length corresponding to the target delay, and after the optical signal is incident through the circulator, the optical signal is transmitted to the reflecting end through the delay ring to be reflected and then output through the circulator, so that the double-length delay effect is realized. The application can effectively ensure the phase consistency of signals, reduce the cost and improve the integration.

Inventors

  • YANG AOAO
  • WANG JUAN
  • REN WEI
  • YANG WENCHU
  • FENG BIN

Assignees

  • 湖南长城海盾光纤科技有限公司

Dates

Publication Date
20260508
Application Date
20251226

Claims (8)

  1. 1. The optical fiber hydrophone array delay combination structure is characterized by comprising an circulator (4), an optical fiber delay ring (1) and an optical fiber reflection end (2), wherein the circulator (4) is provided with an optical inlet port (6), a transmission port (3) and a reflection port (5), the optical inlet port (6) is connected with the input side of the total downlink optical fiber of the optical fiber hydrophone array, the transmission port (3) is connected with one end of the optical fiber delay ring (1), the cut-off position of a tail fiber at the other end of the optical fiber delay ring (1) is connected with the optical fiber reflection end (2), the reflection port (5) is connected with the output side of the total downlink optical fiber of the optical fiber hydrophone array, the optical fiber delay ring (1) is formed by winding single-mode bare fibers, and the total winding length is half of the theoretical optical fiber length corresponding to the target delay.
  2. 2. The optical fiber hydrophone array delay combination structure of claim 1, wherein the circulator (4) is placed at the front end of the array, the return loss is more than or equal to 40dB, the isolation is more than or equal to 30dB, the insertion loss is less than 1.2dB, the working wavelength range is matched with the working wave band of the array, and the size is matched with the caliber of the array.
  3. 3. The fiber optic hydrophone array delay combination of claim 1, wherein the three ports of the circulator (4) are all welded in a predetermined connection relationship.
  4. 4. The fiber optic hydrophone array delay combination of claim 1, wherein the single-mode bare fiber of the fiber optic delay ring (1) is matched with the diameter of the optical fiber inside the array.
  5. 5. The optical fiber hydrophone array time delay combination structure of claim 1, wherein the optical fiber reflection end (2) is of a high-reflectivity structure, and the reflectivity is more than 99%.
  6. 6. The fiber optic hydrophone array time delay combination of claim 6, wherein the fiber optic reflective end (2) is selected from one of a faraday rotator, a reflective metal surface, or a reflective dielectric film.
  7. 7. The optical fiber hydrophone array delay combination structure of claim 1, wherein the optical fiber reflecting end (2) is fixed at the cut-off position of the tail fiber at the other end of the optical fiber delay ring (1) in an adhesive mode, and the adhesive front tail end is cut flat.
  8. 8. The fiber optic hydrophone array delay combining structure of claim 1, wherein the overall size of the fiber optic hydrophone array delay combining structure does not exceed the size of the splice box in which the optical components are disposed in the array.

Description

Optical fiber hydrophone array time delay combined structure Technical Field The application relates to the technical field of underwater acoustic communication, in particular to a fiber optic hydrophone array delay combination structure. Background Along with the development of the underwater acoustic communication technology, the optical fiber hydrophone array is evolving towards high sensitivity, high precision and large scale, and has important application value in the fields of deep sea detection and the like. At present, the transmission capacity of a single-mode fiber is close to the nonlinear shannon limit, in order to break through the transmission bottleneck, the optical signal multiplexing technology is developed from multiple dimensions, wherein the space division multiplexing technology can be used for transmitting optical signals in parallel through multiple optical fibers, so that the frequency spectrum efficiency and the communication capacity can be remarkably improved, and the space division multiplexing technology becomes one of the core technical directions of a large-scale optical fiber hydrophone array. However, the large-scale space division multiplexing optical fiber hydrophone array faces the key technical problem in practical application that the distribution positions of different space division channels are different, so that the lengths of signal transmission links are inconsistent, and further, the time for signals to reach a detection probe is asynchronous. The accuracy and stability of time synchronization directly affect the transmission performance of the system, while the traditional optical fiber delay ring scheme has obvious limitations that on one hand, the delay length is limited by the outer diameter of an array and the size of a device, and has a clear upper limit, the delay length of the traditional delay ring is only hundreds of meters for large-scale arrays with the transmission length reaching kilometer level and can not meet the time synchronization requirement, and on the other hand, the traditional scheme needs to adopt multistage delay ring serial arrangement to realize the required delay, so that the delay optical fiber cost is extremely high and the system integration difficulty is high. Therefore, a novel delay structure and design method are needed to solve the signal synchronization problem of large-scale space division multiplexing array, and reduce cost and improve integration. Disclosure of Invention Aiming at the defects of the prior art, the application provides an optical fiber hydrophone array delay combined structure, which can solve the problem of signal time synchronization of a large-scale space division multiplexing optical fiber hydrophone array, reduce the cost and improve the integration. The application adopts the following technical scheme for realizing the purposes: The optical fiber hydrophone array delay combination structure comprises an circulator 4, an optical fiber delay ring 1 and an optical fiber reflection end 2, wherein the circulator 4 is a1 multiplied by 2 circulator and is provided with three ports, namely an optical inlet port 6, a transmission port 3 and a reflection port 5, the optical inlet port 6 is connected with the input side of the total downlink optical fiber of the optical fiber hydrophone array, the transmission port 3 is connected with one end of the optical fiber delay ring 1, the cut-off position of a tail fiber at the other end of the optical fiber delay ring 1 is connected with the optical fiber reflection end 2, the reflection port 5 is connected with the output side of the total downlink optical fiber of the optical fiber hydrophone array, the optical fiber delay ring 1 is formed by winding single-mode bare fibers, and the total winding length is half of the theoretical optical fiber length corresponding to target delay. In one possible implementation, the circulator 4 is placed at the front end of the array, the return loss is greater than or equal to 40dB, the isolation is greater than or equal to 30dB, the insertion loss is less than 1.2dB, the operating wavelength range is matched with the operating band of the array, and the size is matched with the caliber of the array. In one possible implementation, the three ports of the circulator 4 are all welded in a predetermined connection relationship. In one possible implementation, the single-mode bare fiber of the fiber delay ring 1 is matched to the diameter of the optical fiber inside the array. In one possible implementation, the optical fiber reflection end 2 is a high-reflectivity structure, and the reflectivity is more than 99%. In one possible implementation, the optical fiber reflective end 2 is selected from one of a faraday rotator, a reflective metal surface, or a reflective dielectric film. Wherein the faraday rotator can also suppress polarization dependent losses. In one possible implementation manner, the optical fiber reflecting end 2 is