Low detection penalty in an optical DPSK heterodyne system using a saturated optical amplifier as phase modulator

Author

Hoa, Daniel Hui Bon ; Le Ligne, M. ; O´Hare, Arthur T.

Author_Institution

CNET, Lannion, France

Volume

9

Issue

2

fYear

1991

fDate

2/1/1991 12:00:00 AM

Firstpage

266

Lastpage

270

Abstract

A model established from the rate equations of a near traveling-wave optical amplifier (NTWOA) used as a phase modulator shows that the modulation rate is limited by the carrier lifetime to 500 Mb/s and that the worst-case detection penalty is about 0.7 dB. It is then experimentally demonstrated that close control of the injected light polarization can reduce the detection penalty in a DPSK (differential phase-shift keying) heterodyne system, using an NTWOA phase modulator instead of an LiNbO₃ modulator, to 0.6 dB. This device and a balance receiver have allowed the implementation of 282-Mb/s DPSK link operating at 1.522 μm over 242 km of fiber with a 3-dB margin

Keywords

demodulation; optical communication equipment; optical links; optical modulation; phase shift keying; 1.522 micron; 242 km; 282 Mbit/s; 500 Mbit/s; balance receiver; carrier lifetime; differential phase-shift keying; fiber; injected light polarization; modulation rate; near traveling-wave optical amplifier; optical DPSK heterodyne system; phase modulator; rate equations; saturated optical amplifier; worst-case detection penalty; Differential quadrature phase shift keying; Equations; Optical amplifiers; Optical mixing; Optical modulation; Optical receivers; Phase detection; Phase modulation; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.65885

Filename

65885