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Comparison of noise characteristics of Fabry-Perot-type and travelling-wave-type semiconductor laser amplifiers

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3 Author(s)
Simon, J.C. ; CNET, LAB/MER/FOG, Lanmon, France ; Favennec, J.L. ; Charil, J.

We report results of comparative noise measurements on AlGaAs semiconductor laser amplifiers of the Fabry-Perot and travelling-wave types. We show that, for the same net gain, the electrical baseband signal/noise ratio of a photodetector placed at the amplifier output (after an optical filter) is higher for a travelling-wave-type amplifier, especially at high-gain values where the Fabry-Perot amplifier is operated at oscillation threshold. For a net gain of 20.5 dB, the signal/noise ratio of the travelling-wave-type amplifier is 4¿5 dB better.

Published in:

Electronics Letters  (Volume:19 ,  Issue: 8 )

Date of Publication:

April 14 1983

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