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Design theory of electrically frequency-controlled narrow-linewidth semiconductor lasers for coherent optical communication systems

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2 Author(s)
Kikuchi, K. ; University of Tokyo, Bunkyo-ku, Tokyo, Japan ; Tein-Pei Lee

We describe a design rule for the automatic frequency control of semiconductor lasers by electrical feedback for coherent optical communications. The linewidth achieved by the feedback control is not a good measure for evaluating the system performance, but the bandwidth of the feedback loop is the most important parameter. For example, a 500-MHz loop bandwidth is required for a heterodyne DPSK system when the free-running linewidth of the laser is 10 MHz.

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Lightwave Technology, Journal of  (Volume:5 ,  Issue: 9 )