The distributed feedback laser diode (DFB-LD) is a promising light source for gigabit long-haul transmission systems because of its single-longitudinal-mode operation even under high-speed modulation. However, the intensity noise degradation caused by optical feedback from single-mode fiber ends is more critical in DFB-LD because of its high coherence. Therefore, we have developed a DFB-LD module with an optical isolator.

© 1986 Optical Society of America

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