NDLI: Long-term stable 60 GHz optical two-tone signal by destructive optical interference obtained from RF phase adjustment

Content Provider	IET Digital Library
Author	Chiba, A. Akamatsu, Y. Takada, K.
Abstract	An optical two-tone signal with 60 GHz frequency spacing is experimentally demonstrated, by sinusoidally modulating two lightwaves with different modulation indices and RF phases. By superposing two modulation lightwaves with orthogonal polarisation, polarisation orthogonality is achieved between undesired low-order optical sidebands and the desired high-order optical sidebands together with the incident light-wave. This enables us to suppress the undesired sidebands using polarisers instead of optical filter. Such operation has been implemented using optical modulator possessing RF ports for external termination, which is nested in one mode of polarisation-maintaining Sagnac interferometer (PMSI). This implementation is equivalent to optical single-sideband modulator, but required nested Mach–Zehnder structure is just one. Owing to this reduction together with use of one mode in PMSI, long-term stable operation more than 6 h has been successfully obtained, with 29 dB suppression ratio of undesired first-order sidebands against desired third-order optical sidebands.
Starting Page	736
Ending Page	738
Page Count	3
ISSN	00135194
Volume Number	52
e-ISSN	1350911X
Issue Number	Issue 9, Apr (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/52/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2015.4365
Journal	Electronics Letters
Publisher	The Institution of Engineering and Technology
Publisher Date	2016-04-04
Access Restriction	Open
Rights License	Creative Commons Attribution -Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Subject Keyword	Destructive Optical Interference Frequency 60 GHz High-order Optical SideBand Light Interference Low-order Optical SideBand Modulation And Coding Method Optical Coatings And Filter Optical Filter Optical Modulation Optical Single-sideband Modulator Optical Two-tone Signal Orthogonal Polarisation PMSI Polarisation Orthogonality Polarisation-maintaining Sagnac Interferometer RF Phase Adjustment
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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