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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1992),
  • paper CFB4

Analysis of noise translation in semiconductor lasers

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Abstract

Recent studies have shown that the low-frequency relative intensity noise (RIN) can be translated to the signal band by beating with the modulation signal.1,2 This effect is important in subcarrier multiplexed fiber-optic systems, where it can seriously degrade the signal-to-noise ratio. Although noise translation has been seen experimentally, an accurate theoretical analysis is extremely difficult due to complex nonlinearities arising from the interaction of the laser's longitudinal modes. In this paper, we believe for the first time, we analytically model the dependence of noise translation on modulation and fiber dispersion, by using a general multimode rate equation analysis in which both the symmetric and asymmetric contributions to the nonlinear gain3,4 are included. The rate equations were solved on a CRAY-Y supercomputer.

© 1992 Optical Society of America

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