Optical add and drop multiplexer with adaptive light power equalization function

Abstract

The invention multiplexer consists of light devided multiplexing unit, photo power real-time monitoring unit composed of photo-coupler, photo-detector connected with output terminal of the photo-coupler and driving circuit, power balancing unit composed of electrical tunable photo attenuators and power balance cotrolling unit. The lower signal terminal of the light device multiplexing unit is connected with said photo power real-time monitoring unit, and the upper one is connected with light input terminal of said power balancing unit. The electric controlled signal output terminal of said power balance controlling unit is connected with the electric controlled signal input teminal of said power balancing unit, and the input terminal is connected with lower terminal of said power real-time monitoring unit. The invention OADM has high stability, low leakage, low cost and and high balance precision etc.

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

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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