Open AccessOptical homodyne PSK demonstration of 1.5 photons per bit at 156 Mbps with rate-½ turbo coding
Author(s) -
Mark L. Stevens,
D.O. Caplan,
Bryan S. Robinson,
Don M. Boroson,
A. L. Kachelmyer
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.010412
Subject(s) - optics , physics , photon , dither , homodyne detection , direct conversion receiver , phase shift keying , phase modulation , bit error rate , turbo , computer science , telecommunications , phase noise , bandwidth (computing) , engineering , decoding methods , automotive engineering
We report the first demonstration of a near quantum-limited optical homodyne PSK receiver combined with powerful forward-error-correction coding, achieving 1.5 photons/bit sensitivity, within 4.5 dB of the Shannon limit. Phase-locking was achieved at 1.55 microm using an analog dither-based optical phase-locked loop with an external phase modulator. Analysis for this configuration with arbitrary loop damping is given showing a performance advantage for the overdamped case.