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Optical Millimeter-Wave Signal Generation Using Frequency Quadrupling Technique and No Optical Filtering

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6 Author(s)
Chun-Ting Lin ; Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu ; Po-Tsung Shih ; Chen, J.J. ; Wen-Qiang Xue
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This letter demonstrates a novel method to generate high-purity optical millimeter-wave signals with carrier suppression by using a frequency quadrupling technique. To the authors' knowledge, this is the first time that a frequency quadrupling system requires only a single integrated Mach-Zehnder modulator without a narrowband optical filter to remove undesired optical sidebands. Since no optical filter is needed, fast frequency tuning is straightforward and this approach will be particularly attractive for optical up-conversion in wavelength-division-multiplexing radio-over-fiber systems. This letter provides both theoretical analysis and experimental demonstration. The generated optical millimeter-wave signals have very high quality with an optical carrier and harmonic distortion suppression ratio of more than 38 and 36 dB at 40 and 72 GHz, respectively.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 12 )