Patent ID: 6366374
Filing Date: 2002-04-02
Classification: H04B

Abstract:
An apparatus for monitoring an optical signal characterized by a frequency, comprising:a clock signal generator coupled to generate a clock signal independently of said optical signal; a converter circuit coupled to extract a plurality of samples from said optical signal at a timing determined by said closk signal; and a processor coupled to generate a plurality of estimates of a bit rate of said optical signal, to generate a plurality of eye diagrams from said plurality of samples in accordance with said plurality of estimates and a clock rate of said clock signal, to determine a best eye diagram from said plurality of eye diagrams, said processor for generating said eye diagrams according to an equation x[i]=(i*R) mod 1 wherein i is a sample number, x[i] is an x-coordinate mapping of each sample number, and R is a ratio between a time to acquire one sample and a time of one bit of said optical signal.