Method and apparatus for phase noise estimation
A phase noise and phase recovery technology, applied in the field of optical communication, can solve the problem of low accuracy of phase noise estimation
Active Publication Date: 2019-08-27
SHENZHEN JPT OPTO ELECTRONICS CO LTD
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[0004] Based on this, it is necessary to address the problem of low phase noise estimation accuracy and provide a method and device for improving the accuracy of phase noise estimation and applicable to phase noise estimation of ultra-high-order, high-bandwidth optical signals
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[0057] In order to make the object, technical solution and advantages of the present invention more clear, the present invention 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 invention, not to limit the present invention.
[0058] A phase noise estimation method is used for phase noise estimation of a single polarization coherent detection signal. Wherein, the single-polarization coherent detection signal may also be depolarized X-polarized light or depolarized Y-polarized light. The coherent detection signal referred to here can be understood as a coherent detection situation in which the phase difference between the local oscillator light source and the laser signal source fluctuates slowly. The time scale of slowly varying phase fluctuations is on the order of milliseconds. For common optical signal modulation ...
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The invention relates to a method and apparatus for phase noise estimation. The method for phase noise estimation comprises the following steps: determining multiple discrete phase noise angles within a search scope of a phase noise angle theta; obtaining receiving symbols R(k) after receiving data is subjected to depolarization; under the condition of the same phase noise angle, performing phase recovery on the N receiving symbols R(k) to obtain sending symbols T(k) corresponding to the receiving symbols R(k); obtaining a constellation under the same phase noise angle according to the sending symbols T(k); calculating average distances d<-> between center positions of all clusters and a nearest standard constellation point in a corresponding cluster in the constellation under the same phase noise angle; and searching for a minimum average distance under the multiple discrete phase noise angles, and obtaining a corresponding target phase noise angle according to the minimum average distance. According to the method, true positions of optical signal constellation points under a high-distortion condition can be obtained, the target phase noise angle can be obtained, and optimal phase recovery is realized.
Description
technical field [0001] The present invention relates to the field of optical communication technology, in particular to a method and device for estimating phase noise. Background technique [0002] In optical communication systems, the carrier signal is not a single-frequency sine wave due to the instability of the local oscillators of the transmitter and receiver. This instability is usually measured by phase noise. In optical communication systems, the use of high-order modulation formats can effectively increase system capacity, but at the same time, higher requirements are placed on the accuracy of linewidth estimation. [0003] Traditional phase noise estimation methods include: Blind Phase Search (BPS) algorithm, Viterbi-Viterbi (V-V) algorithm, Extended Kalman Filter (EKF) algorithm, etc., but these phase noise estimation algorithms have their limitations. Among them, although the blind phase search (BPS) algorithm can obtain better estimation accuracy, it is faced w...
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IPC IPC(8): H04B10/61
Inventor 刘健刘猛成学平
Owner SHENZHEN JPT OPTO ELECTRONICS CO LTD