Light add and drop multiplexer for multi-wave length adaptive light power equalization

Abstract

The present invention belongs to the field of light communication network technology. The multiplexer includes: multiple wavelength entrance and exit unit, real-time light power monitoring unit comprising light coupler, light detector and drive circuit, power equalizing unit with electrically tunable light attenuator and power equalizing control unit connected successively. The optical add and drop multiplexer (OADM) of the present invention has high stability, low leakge, low cross talk, low loss, being modular and intelligent and high equalizing precision and has excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical communication networks, in particular to the design of an add / drop multiplexer in an optical network. Background technique [0002] With the rapid increase of the demand for global communication services, especially the rapid growth of data services represented by Internet (Internet) services, it is urgent to establish a new type of communication network with high speed, large capacity, and supporting multiple transmission services. Optical fiber communication has now become the most important means of communication transmission. Various channel multiplexing methods provide effective means for making full use of the huge bandwidth resources of optical fibers. In particular, optical wavelength division multiplexing (WDM) technology has brought large-capacity optical fiber communication systems into a In the new era, the WDM link system realizes the transmission of multiple wavelength channels on on...

AI Technical Summary

Problems solved by technology

Especially in the case of multi-wavelength add / drop, the power level imbalance of each wavelength is more serious

Usually, when designing OADM (for example: OADM scheme of discrete optical switch device + integrated optical multiplexing / demultiplexing device), all wavelength channels are firstly demultiplexed, power equalized separately, and then multiplexed into one On the root fiber, that is to say, whether it is a straight-through wavelength or an add-on / drop-off wavelength, power equalization must be performed separately, and a separate equalizer is required, so the cost is very high

In addition, in the currently commonly used power equalization scheme, for each wavelength of the WDM signal, the equalized power level reference is pre-clamped by hardware and cannot be changed in real time, which brings great limitations to practical use. sex

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