Low-noise single-longitudinal-mode semiconductor lasers are required for high-bit-rate optical-fiber communication systems1 ; distributed-feedback (DFB) lasers are suitable for this. We present facet reflectivity controlled InGaAsP DFB lasers at 1.3 μm, which show extremely low noise [relative intensity noise (RIN) < −160 dB]. Noise increase by optical feedback is greatly suppressed.

© 1986 Optical Society of America

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