title: Optical homodyne PSK demonstration of 1.5 photons per bit at 156 Mbps with rate-(1/2) turbo coding.
abstract: 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.
authors.affiliation: Optical Communication Technology Group, MIT Lincoln Laboratory, 244 Wood St, Lexington, MA 02420, USA. stevens@ll.mit.edu
authors.forename: M L
authors.initials: ML
authors.lastname: Stevens
authors.forename: D O
authors.initials: DO
authors.lastname: Caplan
authors.forename: B S
authors.initials: BS
authors.lastname: Robinson
authors.forename: D M
authors.initials: DM
authors.lastname: Boroson
authors.forename: A L
authors.initials: AL
authors.lastname: Kachelmyer