Title :
Optical heterodyne detection of directly frequency modulated semiconductor laser signals
Author :
Saito, S. ; Yamamoto, Y. ; Kimura, T.
Author_Institution :
NTT, Musashino Electrical Communication Laboratory, Musashino, Japan
Abstract :
Frequency modulated semiconductor laser signals are demodulated by optical heterodyne detection using an independently temperature stabilised semiconductor laser local oscillator and a square law detector followed by electrical frequency discrimination circuitry. Beat frequency stability of the free-running semiconductor laser transmitter and local oscillator and characteristics of direct frequency modulation and optical heterodyne detection are delineated.
Keywords :
optical communication; optical modulation; signal detection; beat frequency stability; electrical frequency discrimination circuitry; frequency modulation; optical heterodyne detection; semiconductor laser local oscillator; square law detector; transmitter;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19800587
