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RF frequency sextupling via an optical two-tone signal generated from two modulation lightwaves from one Mach-Zehnder optical modulator

An optical two-tone (OTT) signal is generated with a wide frequency separation, based on the suppression of ± 1st-order optical sidebands without using optical band-rejection filtering. By combining two orthogonally polarized lightwaves modulated with different modulation indices, each optical sideb...

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Bibliographic Details
Published in:Optics express 2015-10, Vol.23 (20), p.26259-26267
Main Authors: Chiba, Akito, Akamatsu, Yosuke, Takada, Kazumasa
Format: Article
Language:English
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Summary:An optical two-tone (OTT) signal is generated with a wide frequency separation, based on the suppression of ± 1st-order optical sidebands without using optical band-rejection filtering. By combining two orthogonally polarized lightwaves modulated with different modulation indices, each optical sideband constituting the combined lightwave has a different polarization. Some of these optical sidebands can be suppressed using a polarizer. By using a single Mach-Zehnder optical modulator to achieve two optical modulations, an OTT signal with a 60-GHz frequency-separation was successfully generated with 32-dB suppression of undesired ± 1st-order optical sidebands. An rf signal was also obtained from the OTT signal.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.026259