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Interferometric conversion of laser chirp to IM: effect of the interferometer free spectral range on the output nonlinear distortion

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1 Author(s)
G. Yabre ; Lab. RESO, Ecole Nat. d''Ingenieurs, Brest, France

The two-tone modulation behavior of a semiconductor laser followed by a Mach-Zehnder interferometer is theoretically analyzed under the small-signal assumption. Illustrations are given of the signal at the Mach-Zehnder output, showing the influence of the interferometer free spectral range on the second-order harmonic (2HD) as well as the third-order intermodulation distortion (IMD). The direct intensity modulation (IM) distortions are also reported together with those of frequency modulation (FM) to facilitate direct comparison. The results show that a Mach-Zehnder with low free spectral range is required to achieve low FM distortion levels over those of the direct IM.

Published in:

IEEE Photonics Technology Letters  (Volume:8 ,  Issue: 10 )