Patent ID: 6556323
Filing Date: 2003-04-29
Classification: H04B,H04J,H04L

Abstract:
A demultiplexing and clock frequency-recovery circuit comprising:a non-linear modulator for providing a tributary signal from a received signal; an optical amplifier coupled to the non-linear modulator to amplify the received signal; a baseband receiver coupled to the optical amplifier, the baseband receiver for converting the received signal into an electric signal; an amplifier coupled to the baseband receiver for amplifying the received signal; a high-Q filter coupled to the amplifier for filtering a signal of selected frequency range; and a variable phase delay coupled to the high-Q filter and the non-linear modulator, the variable phase delay for adjusting phase in the filtered signal of selected frequency range and feeding the phase adjusted filtered signal back to the non-linear modulator, wherein the baseband signal frequency and clock frequency are recovered.