Optical Millimeter-Wave Signal Generation Using Frequency Quadrupling Technique and No Optical Filtering
IEEE Photonics Technology Letters
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
... l be particularly attractive for optical up-conversion in wavelength-divisionmultiplexing 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. Index Terms-Mach-Zehnder modulator (MZM), optical frequency multiplication, optical millimeter-wave, radio-over-fiber (RoF).