Patent ID: 7079765
Filing Date: 2006-07-18
Classification: H04B,H04J,H04L

Abstract:
1. An optical wavelength division multiplexed signal monitoring apparatus comprising: optical wavelength division demultiplexing means for carrying out optical wavelength division demultiplexing of an optical wavelength division multiplexed signal including N optical signals with a bit rate f one or N opto-electric conversion means for receiving optical wavelength division demultiplexed signals demultiplexed by said optical wavelength division demultiplexing means, and for converting the optical wavelength division demultiplexed signals into electric intensity modulated signals; electric signal processing means for carrying out optical signal quality evaluation based on the electric intensity modulated signals output from said one or N opto-electric conversion means; and sampling clock generating means for generating a sampling clock signal whose repetition frequency is f said electric signal processing means is a single system, and samples electric intensity modulated signals supplied from said one or N opto-electric conversion means by the sampling clock signal generated by the sampling clock generating means, obtains optical signal intensity distribution from sampled signals generated thereby, and evaluates an optical signal quality parameter based on the optical signal intensity distribution.