Sensitivity degradation in polarization diversity receivers for lightwave systems

Author

Imai, Takamasa

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

9

Issue

5

fYear

1991

fDate

5/1/1991 12:00:00 AM

Firstpage

650

Lastpage

658

Abstract

The effect of weighting circuit unidealities on the sensitivity degradation of diversity receivers is examined for synchronous and nonsynchronous detectors. A novel model is developed in which the weighting ratio for each polarization diversity receiver branch can be calculated using practical values. For synchronous detectors, it is shown analytically that the sensitivity degradation is relatively independent of the weighting ratio deviation from the optimum value. The same is also true for nonsynchronous detectors. Results of experiments on a 600 Mb/s single-filter frequency-shift keying (FSK) lightwave system, a 400 Mb/s continuous-phase FSK (CPFSK) lightwave system, and an amplitude-shift keying (ASK) synchronous detection network simulated with a 600 Mb/s baseband system generally support the theoretical results

Keywords

amplitude modulation; frequency shift keying; optical communication equipment; receivers; 400 Mbit/s; 600 Mbit/s; amplitude shift keying synchronous detection network; continuous phase frequency shift keying lightwave system; model; nonsynchronous detectors; polarization diversity receiver branch; sensitivity degradation; single filter frequency shift keying lightwave system; synchronous detectors; weighting circuit unidealities; Circuits; Degradation; Detectors; Diversity reception; Fluctuations; Frequency shift keying; Optical distortion; Optical polarization; Optical receivers; Optical sensors;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.79542

Filename

79542