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Clock recovery and adaptive equalizer combined device and method in coherent light communication

An adaptive equalization and coherent optical communication technology, applied in the field of coherent optical communication, can solve the problems of low tolerance and great impact on system performance, and achieve the effect of improving tolerance, reducing computational complexity and reducing computational complexity

Active Publication Date: 2020-04-28
WUHAN POST & TELECOMM RES INST CO LTD
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AI Technical Summary

Problems solved by technology

The data is combined together, this complex equalizer has a low tolerance to IQ input imbalance, and the system performance is greatly affected in the case of IQ input imbalance

Method used

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  • Clock recovery and adaptive equalizer combined device and method in coherent light communication
  • Clock recovery and adaptive equalizer combined device and method in coherent light communication

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Embodiment Construction

[0036] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] An embodiment of the present invention provides a combined device for clock recovery and adaptive equalizer in coherent optical communication, including two interpolation filters, two sets of first-stage multi-channel real number equalizers, and two second-stage single-channel linear real number equalizers , two timing error detectors, two filters, and two numerically controlled oscillators, where:

[0038] The two interpolation filters are used to: respectively receive the sampled data of two polarizations, and output them to two sets of first-stage multi-channel real number equalizers;

[0039] Two sets of first-stage multi-channel real number equalizers are used to: receive the data sent by the interpolation filter, perform depolarization multiplexing, and respectively output to the connected second-stage single-channel linear real nu...

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Abstract

The invention discloses a clock recovery and adaptive equalizer combination device and method in coherent light communication, relates to the technical field of coherent light communication, and adopts a new equalizer structure and algorithm to realize clock recovery and adaptive equalization at the same time. Specifically, a two-stage real number equalization structure and a second-stage adaptivecoefficient are adopted to calculate a timing error so as to realize clock recovery, polarization demultiplexing and dispersion compensation. According to the structure, an independent clock recoverymodule is omitted, compared with a traditional structure, the calculation complexity is reduced, the clock recovery accuracy is improved, and the tolerance to IQ data imbalance of a receiving end isimproved. The two-stage equalization of the structure adopts real number equalization, so that the IQ two paths of data are not combined together any more in the equalization process, and the problemthat the system performance is greatly influenced under the condition that IQ has time delay can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of coherent optical communication, in particular to a combination device and method of clock recovery and adaptive equalizer in coherent optical communication. Background technique [0002] Coherent optical communication technology is widely used in the era of 40G and 100G optical communication due to its high sensitivity, good frequency selectivity, and high spectral efficiency. DSP (Digital Signal Processing, digital signal processing) technology plays a pivotal role in the coherent transmission system. After coherently receiving and demodulating the signal light at the receiving end, the ADC (Analog-Digital Converter, Analog-to-Digital Converter) is used to sample the demodulated electronic signal, and then the sampled digital signal is passed through the DSP algorithm to damage the signal transmission process. Compensate and restore. [0003] DSP algorithms include: clock recovery, adaptive equalizatio...

Claims

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Application Information

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IPC IPC(8): H04B10/40H04B10/61H04L25/03H04L27/38
CPCH04B10/40H04B10/61H04L25/03H04L27/3818H04L2025/03433
Inventor 李婕曾韬孟令恒张旭
Owner WUHAN POST & TELECOMM RES INST CO LTD
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