Title :
M-ary phase-shift-keying optical heterodyne communication system
Author :
Kiasaleh, Kamran
Author_Institution :
Erik Jonsson Sch. of Eng. & Comput. Sci., Texas Univ., Richardson, TX, USA
Abstract :
A heterodyne optical communication system using the M-ary phase-shift-keying (or differentially encoded MPSK) modulation technique is proposed and investigated. A coherent receiver structure for the model is suggested. In the model, the carrier recover is established via a phase-locked loop model preceded by Mth law device. Subsequently, coherent detection algorithms are employed to detect the encoded MPSK or differentially encoded MPSK symbols. The performance of the models is obtained when the semiconductor lasers possess nonzero spectral linewidths. Numerical results are presented to explain the impact of the system parameters, such as laser linewidth, laser flicker noise, and input signal-to-noise ratio, on the performances of the systems. It is shown that the coherent systems can be improved, when compared with the M-ary FSK system, by a factor of up to 32 via MPSK modulation
Keywords :
demodulation; optical communication; optical communication equipment; phase shift keying; receivers; signal detection; M-ary PSK system; Mth law device; PLL model; carrier recover; coherent detection algorithms; coherent receiver structure; differentially encoded MPSK; input SNR; laser flicker noise; laser linewidth; modulation technique; nonzero spectral linewidths; optical heterodyne communication system; phase-locked loop model; phase-shift-keying; semiconductor lasers; system performance; Laser modes; Laser noise; Optical fiber communication; Optical mixing; Optical modulation; Optical receivers; Phase locked loops; Phase modulation; Phase shift keying; Semiconductor lasers;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.63998
