Patent ID: 6930623
Filing Date: 2005-08-16
Classification: H04J

Abstract:
1. An optical signal processing system to convert a serial pulse train optical signal with transmission speed N to parallel pulse train electrical signals comprising: a serial-parallel converter in which at least two cascaded optical switches are provided, each of which includes an input terminal and two output terminals and receives said serial pulse train optical signal as an input to the input terminal and outputs a pulse train optical signal with transmission speed M equal to a value obtained by dividing the transmission speed N by an integer to one of the two output terminals and outputs pulse train optical signals to an alternative one of said two output terminals by switching a connection to said output terminals, a plurality of receiving parts which are provided respectively for each optical switch located in said serial-parallel converter and convert the optical signals from one of two output terminals of each of said optical switches to electrical signals, a synchronizing circuit which extracts clock signals from electrical signals output from one of said plurality of receiving parts and outputs timing signals in synchronization with these clock signals, and drivers which are provided for each of said optical switches located in said serial-parallel converter and cause said optical switches to switch their connections based on timing signals output from said synchronizing circuit.