Optical Polarization Azimuth Modulation (POLAM)/ Heterodyne Detection System

Toshiaki KURI  Katsutoshi TSUKAMOTO  Norihiko MORINAGA  

IEICE TRANSACTIONS on Communications   Vol.E78-B   No.5   pp.746-751
Publication Date: 1995/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
coherent optical space communication,  state of polarization (SOP),  polarization azimuth modulation (POLAM),  phase noise,  polarization axis mismatch,  

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In coherent optical space communication systems, the phase noise generated from high power laser diodes and the polarization axis mismatch between transmitter and receiver are the serious problem. In this paper, a novel coherent optical space communication system, called optical polarization azimuth modulation (POLAM)/heterodyne detection system is newly proposed, and its system performance is theoretically investigated. It is clarified that the POLAM system can perfectly remove the laser phase noise, is actually insensitive to the polarization axis mismatch, and can provide the remarkable performance improvement compared to a conventional optical frequency modulation system.