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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CFD5

Ultra-narrow linewidth InGaAs/ InGaAsP quantum-well DFB lasers

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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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