Method for improving transmission quality of WDM system signal

Abstract

A method promoting signal transmission quality for WDM, on optical demultiplexer in the system -1dB spectra width are controlled at -0.35nm, and >0.2nm. The optical demultiplexer is the demultiplex part of the output terminal demultiplexer or optical add / drop mutiplexer. Particularly the demultiplexer between the 0.2 nm -0.35 nm can be selected; ether before the ordinary optical demultiplexer of terminal station or before the demultiplex part of optical add / drop multiplexer of optical add / drop multiplex station adds a 50GHz optical comb filter applied to spectralwave 80 DWDM system to compress spectral width of pass band in the optical demultiplexer. Or the terminal station selects the array light guide wave separator or filter plate type light wave separateor of which the central wavelength is modulated to the side and a filter plate is connected inseries at its each demultiplex channel, through modulating the wavelength in central of filter plate implements the compression for superposition light spectrum width.

Description

technical field [0001] The invention relates to a method for improving signal transmission quality of a WDM system, including an optical communication transmission system of an optical amplifier, and is especially suitable for a wavelength division multiplexing transmission system, including a WDM transmission system and an OADM transmission system. Background technique [0002] The so-called wavelength division multiplexing optical transmission system is to use the principle that different optical wavelengths are independent of each other and do not interfere with each other in an optical fiber to transmit multiple signals from different sources to achieve the purpose of expanding the transmission capacity. In order to achieve stable transmission, it is necessary to divide each channel appropriately, just like the lane division on a highway, so that the signals running on each channel are independent and reach the end of transmission smoothly. At the same time, it is necess...

AI Technical Summary

Problems solved by technology

This brings a series of problems for the labor protection of engineers and the interconnection safety of optical connectors, and there is also the danger of introducing nonlinear effects

The forward error correction coding technology can often obtain nearly 10dB optical signal-to-noise ratio gain with different coding schemes, but it also has complex coding and decoding schemes, requires the support of ultra-large-scale computing circuits, and each optical channel must be processed separately, etc. question

And there is also the risk of decoding errors

Images