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Method and system for unbalance separation and monitoring of transceivers with transparent modulation format

A modulation format and transceiver technology, applied in the field of optical communication, can solve the problems of poor robustness, performance degradation, indistinguishability, etc., and achieve the effects of wide measurement range and modulation format, strong noise, and multiple monitoring dimensions

Active Publication Date: 2021-12-07
HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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AI Technical Summary

Problems solved by technology

[0003] The defect of the existing technology is: in the coherent optical communication system, there are two technical defects that need to be solved urgently in the traditional imbalance monitoring scheme
The first problem is the inability to separate transmitter (Transmitter, Tx) and receiver (Receiver, Rx) impairments
When Tx and Rx impairments exist at the same time, the existing schemes cannot distinguish these impairments, so that the correct parameters cannot be estimated
The second problem is poor robustness
However, existing polarization tracking and carrier phase recovery schemes degrade dramatically in the presence of transmitter impairments

Method used

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  • Method and system for unbalance separation and monitoring of transceivers with transparent modulation format
  • Method and system for unbalance separation and monitoring of transceivers with transparent modulation format
  • Method and system for unbalance separation and monitoring of transceivers with transparent modulation format

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Embodiment Construction

[0073] In order to meet the application requirements of elastic optical networks, the present invention discloses a transceiver imbalance separation and monitoring method with transparent modulation format. The present invention is applicable to a heterodyne coherent monitoring system using square QAM modulation format, which can separate and monitor Rx and The in-phase and quadrature components (In-phase / quadrature, IQ) and X-polarization and Y-polarization (x-polarization / y-polarization, XY) of Tx are unbalanced. Imbalances that can be monitored include: IQ magnitude / phase imbalance and clock skew; XY magnitude imbalance and clock skew. The invention utilizes the natural frequency offset in the system to separate the IQ imbalance of the transceiver, and uses a polarization scrambler to introduce continuous polarization rotation to separate the XY imbalance of the transceiver. The present invention uses Schmidt quadrature method (Gram-Schmidt orthogonalization procedure, GSOP...

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Abstract

The invention provides a transceiver imbalance separation and monitoring method and system with transparent modulation format. The invention is suitable for a heterodyne coherent monitoring system with square QAM modulation format, and can separate and monitor the IQ / XY imbalance of transceivers. Imbalances that can be monitored include: transceiver IQ magnitude / phase imbalance and clock skew; transceiver XY magnitude imbalance and clock skew. The frequency offset naturally existing in the system is used to separate the IQ imbalance of the transceiver, and the polarization scrambler is used to introduce continuous polarization rotation to separate the XY imbalance of the transceiver. The Rx and Tx amplitude and phase imbalances were estimated using the GSOP and ML‑ICA methods, respectively, and the Rx / Tx clock skew was estimated using the Godard‑TED method. The beneficial effect is that the invention can separate and monitor the unbalanced damage of the transceiver, and has the technical advantages of multiple monitoring dimensions, strong robustness, wide measurement range and transparent modulation format.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a transceiver imbalance separation and monitoring method and system with transparent modulation format. Background technique [0002] With the rapid growth of global Internet traffic, people's demand for optical communication bandwidth continues to increase. In order to meet the needs of communication, the transmission rate and modulation order of signals in optical communication systems are constantly increasing. However, both high-speed and high-order modulation signals are extremely sensitive to equipment imbalance impairments, so comprehensive transceiver imbalance monitoring techniques are essential to maintain system stability. An ideal monitoring solution not only needs to separate and estimate a wide variety of damages, but also needs to have strong noise robustness and a wide measurement range. In addition, considering the adaptive configuration of multip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/61
CPCH04B10/61H04B10/6164H04B10/6165
Inventor 杨彦甫张群
Owner HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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