Light-source management method supporting WDM grid frequency standard of coherent light network

Abstract

The invention provides a light-source management method supporting a WDM grid frequency standard of a coherent light network. The method includes: an optical-frequency-comb generator generates an optical frequency comb with distance precision; the optical frequency comb generator sends the optical frequency comb to each optical network node or after the optical frequency comb passes through a demultiplexer, each demultiplexed spectrum line which undergoes demultiplexing is sent to a corresponding network node; each network node extracts a corresponding single spectral line from the optical frequency comb or obtains directly a single spectral line which passes the demultiplexer; and a single spectral line of the optical frequency comb is used as a light carrier for local sending, local oscillating light used for receiving or injection light used for a local laser device. The optical frequency comb is highly stable in frequency output, precise in frequency interval and free from frequency deviation. The optical-frequency comb is sent to each optical node and can be used as light carrier, local oscillating light or light sent out by a main laser device for light injection and locking so that frequency and phase locking of semiconductor laser devices at the optical network nodes is realized.

Description

technical field [0001] The invention relates to optical communication technology, in particular to optical network technology. Background technique [0002] The network nodes of the existing optical network usually adopt the direct detection technology to realize signal detection and demodulation, which has a simple structure and low cost. However, the direct detection technology has inherent defects such as low receiving sensitivity and low spectrum utilization, making it unsuitable for long-distance backbone network transmission. Coherent detection has high receiving sensitivity and high spectrum utilization, which is more conducive to improving spectrum utilization and realizing large-capacity, long-distance optical fiber transmission. Although the cost of coherent optical detection is still relatively high, it is foreseeable that if coherent receivers can be developed on silicon photonics platforms, it is possible to significantly reduce the cost of coherent detection, ...

AI Technical Summary

Problems solved by technology

Therefore, most experiments use external cavity lasers (ECL) to obtain narrow linewidth output, however, the corresponding cost is relatively high

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