Dispersion Damage Monitoring Method Based on Digital Nonlinear Processing

Abstract

The invention relates to a method for monitoring dispersion damage based on digital nonlinear processing in the field of optical fiber communication. Part of the signal light is obtained from the main transmission line through an optical filter and input to the TDC. The main control module drives the TDC to generate a series of dispersion values, and records N sampled digital signals p1, p2,..., pN at each dispersion value to calculate the output The signal f(pj) is a non-linear function that can be expanded into a Taylor series; then the amount of dispersion imposed by the TDC on the signal is used as the x-coordinate, corresponding to the output signal <pout>The symmetry center of the data curve whose value is the y coordinate is identified to obtain the x coordinate of the symmetry center of the data curve, and the opposite value of the x coordinate of the above symmetry center is the magnitude of the signal dispersion damage. In addition to the advantages of easy integration, low power consumption and unlimited signal rate, the invention does not affect signal transmission and can realize large-scale, anti-interference and full-blind automatic dispersion damage monitoring.< / pout>

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication, nonlinear optics and signal processing, in particular to a digital nonlinear processing dispersion damage monitoring method. Background technique [0002] In recent years, in order to meet the ever-increasing demand for bandwidth, optical fiber communication networks have developed rapidly. The single-channel 40Gb / s WDM system has been commercialized, and the deployment of WDM systems above 100Gb / s is imperative. The improvement of the transmission rate makes the optical fiber chromatic dispersion (CD) damage replace the optical fiber loss as the main factor limiting the transmission distance and speed of the optical fiber communication system. Therefore, real-time monitoring of signal dispersion damage at receivers or key network nodes can realize adaptive dispersion compensation to reduce bit error rates, or provide key signal quality parameters for optical network managem...

AI Technical Summary

Problems solved by technology

However, there are still some defects in this kind of all-optical dispersion damage monitoring device (AODM).

First of all, its monitoring range is generally limited by the period of the Talbot effect; secondly, it is easily affected by polarization mode dispersion (PMD), optical signal-to-noise ratio (OSNR) or input signal optical power fluctuations, resulting in weak anti-interference ability; although the applicant has previously proposed An AODM based on an optical parametric amplifier (patent name: an all-optical signal quality monitor based on an optical parametric amplifier, authorized patent number 201010290188.x) can solve the above problems, but it has the problems of high power consumption and large volume , more suitable for monitoring the dispersion of ultra-high-speed optical signals

Images