Title

MEASUREMENT OF THE SPECTRAL LINEWIDTH OF SEMICONDUCTOR LASERS FOR USE WITH COHERENT OPTICAL COMMUNICATION SYSTEMS.

Document Type

Conference Proceeding

Date of Original Version

1-1-1987

Abstract

Semiconductor laser diode narrow linewidths (10 kHz-10 MHz) are essential for coherent fiber optical communication systems. Linewidth measurement techniques fall into three groups. Each group is discussed, along with the unbalanced interferometric method. The correlated unbalanced interferometric method was developed, and it is shown that the envelope function of the beat signal is the Fourier transform of the original laser lineshape. Novel approaches to linewidth measurement techniques, such as series use of Bragg cells and combination of Mach-Zehnder and Sagnac interferometers are proposed.

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