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

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...

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

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