Abstract
Coherent optical transmission systems require a semiconductor laser diode with narrow linewidth and stable operation. For example, DPSK or CPFSK modulation schemes in the Gbit/s region require a linewidth of 1 MHz or less. The linewidth has usually been reduced by various external cavity configurations. A fiber-external-cavity configuration1 is one of the most promising for practical use, since it can offer a compact optical source insensitive to mechanical vibration. From this viewpoint, we have developed compact and stable DFB-LD modules using a fiber external cavity.
© 1988 Optical Society of America
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