DC Drift Compensation of LiNbO3 Intensity Modulator Using Low Frequency Perturbation

Shigeki AISAWA  Hiroshi MIYAO  Noboru TAKACHIO  Shigeru KUWANO  

IEICE TRANSACTIONS on Communications   Vol.E81-B   No.1   pp.107-109
Publication Date: 1998/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Communication Device and Circuit
optical communication,  DC drift,  intensity modulators,  drift compensation,  

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A simple method of compensating the DC drift of LiNbO3 Mach-Zehnder intensity modulators for very high speed optical transmission systems is proposed. This method adds low frequency perturbation to the modulator driving signal, and controls the bias voltage using the detected envelope of the modulator output signal. The control circuit is successfully demonstrated to work with less than a 0. 1-dB power penalty.