Abstract: An optical communication system configured to operate with optical signals at lower signal to noise ratios than previously contemplated. The communication system includes a receiver having an optical pre-processor coupled between a demultiplexer and a detector. The optical pre-processor includes either an optical polarization section having a polarization rotator and an optical polarizer, a phase modulation section that includes a phase modulator and a dispersion element and a clock recovery circuit, or an amplitude modulation section that includes an amplitude modulator clock recovery circuit and a spectral shaping filter.
Type:
Grant
Filed:
May 7, 2001
Date of Patent:
April 10, 2007
Assignee:
Tyco Telecommunications (US) Inc.
Inventors:
Neal S. Bergano, Alexei N. Pilipetskii, M. Imran Hayee