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Optical two-tone generation and SSB modulation using electro-optic modulator with suppressing redundant spectrum components

Published online by Cambridge University Press:  27 April 2011

Akira Enokihara ,
Tadashi Kawai  and
Tetsuya Kawanishi
Akira Enokihara*
Affiliation:
Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan. Phone: +81 79 267 4872.
Tadashi Kawai
Affiliation:
Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan. Phone: +81 79 267 4872.
Tetsuya Kawanishi
Affiliation:
National Institute of Information and Communications Technology, 4-2-1, Nukui-kita, Koganei, Tokyo 184-8795, Japan.
*
Corresponding author: A. Enokihara Email: enokihara@eng.u-hyogo.ac.jp
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Abstract

Doubled frequency optical two-tone generation and optical single sideband (SSB) modulation by the dual-electrode-type electro-optic (EO) modulator with a single Mach–Zehnder (MZ) interferometer were considered. We theoretically showed that redundant spectrum components in the modulated optical signals, which are caused by the imbalance of light splitting ratio between the two arms of the interferometer, are significantly suppressed by controlling the input power ratio of RF modulation signals applied to each electrode. This effect was confirmed by the experiment, where an optical two-tone with the redundant components 49.8 dB lower than the primary two-tone components in intensity level was obtained. This method is also valid for suppression of undesired frequency components of RF signals that are generated at a photo detector from the optical two-tone waves propagated through a dispersive optical fiber.

Keywords

Electro-optical modulatorOptical two-toneSSB modulationOptical fiber transmission
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 3 , Special Issue 3: Special Issue on European Microwave Week 2010 , June 2011 , pp. 295 - 300
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2011

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References

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