Directional coupler modulator with high linearity

William S. C. Chang; Mark L. Farwell; Zong Qi Lin

doi:10.1117/12.144153

11 May 1993 Directional coupler modulator with high linearity

William S. C. Chang, Mark L. Farwell, Zong Qi Lin

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144153
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

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.

Citation Download Citation

William S. C. Chang, Mark L. Farwell, and Zong Qi Lin "Directional coupler modulator with high linearity", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144153

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