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Proceedings Paper

Directional coupler modulator with high linearity
Author(s): William S. C. Chang; Mark L. Farwell; Zong Qi Lin
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Paper Abstract

Analog optical fiber communication requires linear modulators with low third order intermodulation and harmonic distortions in order to realize sufficient dynamic range. We report here a novel design of the directional coupler modulator which has used passive serial feedforward mechanism to effectively compensate nonlinear distortions. Low frequency testing has demonstrated that, for an optical modulation depth of 30% per channel, the third order intermodulation distortion is more than 30 dB lower than that of the conventional directional coupler or Mach-Zehnder modulators. Harmonic distortions are reduced substantially at the same time. Operation at rf and microwave frequencies is limited by the transit time effect.

Paper Details

Date Published: 11 May 1993
PDF: 10 pages
Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); doi: 10.1117/12.144153
Show Author Affiliations
William S. C. Chang, Univ. of California/San Diego (United States)
Mark L. Farwell, Univ. of California/San Diego (United States)
Zong Qi Lin, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 1979:
1992 International Conference on Lasers and Optoelectronics
Sui-Sheng Mei; Bingkun Zhou, Editor(s)

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