Abstract
Narrowing the spectral linewidth of semiconductor lasers is a key technology for coherent communication systems. This is because the receiver sensitivity depends on the spectral linewidth. The required spectral linewidth depends on the modulation/demodulation schemes and transmission rate. For frequency shift keying (FSK) and heterodyne schemes, a spectral line-width below 10 MHz is required at 1 Gbit/s transmission vale. However, to attain the highest receiver sensitivity by phase shift keying (PSK) and homodyne schemes, a much narrower spectral linewidth below few hundred kHz is required at 1 Gbit/s transmission rate.
© 1991 Optical Society of America
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