Feasibility study on QPSK optical-heterodyne detection system

Author

Yamazaki, Shuntaro ; Emura, Katsumi

Author_Institution

Opto-Electron. Res. Lab., NEC Corp., Kawasaki, Japan

Volume

8

Issue

11

fYear

1990

fDate

11/1/1990 12:00:00 AM

Firstpage

1646

Lastpage

1653

Abstract

The feasibility of a QPSK (quadrature-phase-shift-keying) optical heterodyne detection system for a high-speed and long-span coherent transmission is investigated. The key factors, which are the modulation method and the spectral linewidth requirement for optical light sources, are discussed. Through theoretical analysis and the simulation experiment, it is confirmed that the required beat spectral linewidth for QPSK coherent detection is less than 7.5×10^-5×bit rate. It is also shown that the required spectral linewidth for QPSK differentially coherent detection is less than 2.5×10^-5×bit rate. These results show that the gigabits-per-second range QPSK optical heterodyne detection can be realized with conventional external cavity laser diodes

Keywords

demodulation; optical communication equipment; phase shift keying; QPSK coherent detection; conventional external cavity laser diodes; feasibility; high speed long span coherent transmission; modulation method; optical light sources; quadrature phase shift keying optical heterodyne detection system; simulation experiment; spectral linewidth requirement; theoretical analysis; Bandwidth; High speed optical techniques; Light sources; Optical detectors; Optical mixing; Optical modulation; Optical receivers; Optical sensors; Phase modulation; Quadrature phase shift keying;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.60560

Filename

60560