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Depolarization multiplexing method and system based on momentum factor

A momentum factor, demultiplexing technology, applied in the field of coherent optical communication

Active Publication Date: 2019-07-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

This solves the technical problem of polarization state tracking in the lightning environment

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  • Depolarization multiplexing method and system based on momentum factor
  • Depolarization multiplexing method and system based on momentum factor
  • Depolarization multiplexing method and system based on momentum factor

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Embodiment Construction

[0061] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below may be combined with each other as long as they do not constitute a conflict with each other.

[0062] Such as figure 1 As shown, it is a schematic diagram of the signal processing flow of the depolarization multiplexing algorithm based on the reverse observation error in the embodiment; where the signals carried by the two mutually orthogonal polarization states of the transmitting end X and Y are transmitted through the optical fiber channel, and the channel It can be simulat...

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Abstract

The invention discloses a depolarization multiplexing method based on a momentum factor, and belongs to the technical field of coherent light communication. The method comprises the following steps: firstly, initializing a demultiplexing matrix A (n), wherein the demultiplexing matrix is a 2 * 2 matrix; inputting the two paths of polarization state signals X '(n) and Y' (n) into A (n) to obtain ademultiplexed signal; finding out constellation points X # (n) and Y # (n) closest to X # '(n) and Y #' (n), and calculating an initial error epsilon1 (n); inputting the constellation points X # (n) and Y # (n) into an inverse matrix A-1 (n) to obtain pseudo observation signals X ''(n) and Y ''(n), and calculating a reverse observation error epsilon2 (n); then constructing a momentum factor omega(n) by the gradient information of the matrix A (n); updating the multiplexing matrix A (n) by using a gradient descent method; and finally repeating the above steps, solving to obtain a demultiplexingsignal, and updating the demultiplexing matrix A (n). The invention also discloses a depolarization multiplexing system based on the momentum factor, and the convergence speed of the depolarization multiplexing algorithm is further improved by introducing the new dimension of the momentum factor. Therefore, the technical problem of polarization state tracking in a lightning environment is solved.

Description

technical field [0001] The present application belongs to the technical field of coherent optical communication, and more specifically, relates to a method and system for depolarization multiplexing based on a momentum factor. Background technique [0002] With the rapid growth of communication services, it is imperative to increase the system capacity. Polarization Multiplexing (PM) utilizes the polarization characteristics of light transmitted in single-mode fiber, and uses two independent and mutually orthogonal polarization states with equal transmission wavelengths as independent channels to transmit two signals respectively, which doubles the System capacity, increased spectrum utilization. [0003] Since the two polarization states are affected by factors such as polarization mode dispersion, polarization-dependent loss, and non-orthogonal input signals during transmission, the polarization states change to form mutual crosstalk. In severe weather conditions, the Fa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61
CPCH04B10/61H04B10/6165
Inventor 葛晓虎智捷王龙飞韩涛
Owner HUAZHONG UNIV OF SCI & TECH
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