Distributed feedback laser diodes (DFB LDs) have attracted strong interests as light sources for long distance and high capacity optical fiber transmission systems. Among various DFB LD schemes, a phase shifted DFB LD has been considered a most ideal DFB LD from a view point of stable single longitudinal mode (SLM) operation due to a large gain difference between the main mode and the sub mode.

© 1988 Optical Society of America

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