Abstract
Distributed feedback (DFB) lasers can be used as multi-Gbit/s frequency modulated or phase modulated data sources by driving them with a bias current far above threshold and adding a relatively small modulation current. Then the optical spectral width can be as narrow as the information bandwidth, thus minimizing system degradations due to fiber chromatic dispersion. Direct frequency shift keying (FSK) and differential phase shift keying (DESK) modulation of DFB lasers are attractive for avoiding the insertion loss and additional systems complexity of external modulators. Furthermore, either signal format can be used for direct detection by including an optical demodulator at the receiver.
© 1990 Optical Society of America
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