NDLI: Broadband-Frequency-Tunable Sub-Terahertz Wave Generation Using an Optical Comb, AWGs, Optical Switches, and a Uni-Traveling Carrier Photodiode for Spectroscopic Applications

Content Provider	IEEE Xplore Digital Library
Author	Ho-Jin Song Shimizu, N. Furuta, T. Suizu, K. Ito, H. Nagatsuma, T.
Copyright Year	1983
Abstract	We present a monochromatic sub-terahertz signal generation technique using an optical comb signal, arrayed waveguide gratings (AWGs), and a uni-traveling carrier photodiode (UTC-PD) for spectroscopic applications. This scheme offers random or continuous frequency tuning in the range between 100 GHz and up to 1 THz. In addition, since a RF synthesizer is employed as a reference signal source of the photonic frequency multiplier, frequency locking with external instruments and reliable operation are offered. Highly coherent optical comb signal for the photonic frequency multiplication provides a narrow linewidth and very low phase noise in the generated sub-terahertz signal. For 125 GHz, the phase noise is approximately -92 dBc/Hz at the offset frequency of 10 kHz. This is larger than that of the 25-GHz RF source by about 13 dB and agrees well with the theory regarding phase noise multiplications due to frequency multiplication. For generating monochromatic signals, unwanted spurious signals are suppressed in the optical domain over a wide range with two AWGs, and the suppression ratio is expected to be better than 46 dBc. Utilizing the implemented sub-terahertz signal generator with a J-band UTC-PD module, absorption lines of N₂O were measured in the frequency range between 240 and 360 GHz and compared with theoretical calculations.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	2521
Ending Page	2530
Page Count	10
File Size	1678380
File Format	PDF
ISSN	07338724
Volume Number	26
Issue Number	15
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical switches Photodiodes Spectroscopy Signal generators Arrayed waveguide gratings Phase noise Optical arrays Optical waveguides Radio frequency Frequency synthesizers uni-traveling carrier photodiode Optical comb signal sub-terahertz wave generation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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