Title :
Feasibility study on QPSK optical-heterodyne detection system
Author :
Yamazaki, Shuntaro ; Emura, Katsumi
Author_Institution :
Opto-Electron. Res. Lab., NEC Corp., Kawasaki, Japan
fDate :
11/1/1990 12:00:00 AM
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;
Journal_Title :
Lightwave Technology, Journal of
