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Proceedings Paper

Frequency measurement of THz waves by electro-optic sampling using Mach-Zehnder-modulator-based flat comb generator
Author(s): Isao Morohashi; Mayu Kirigaya; Yuta Kaneko; Ikufumi Katayama; Takahide Sakamoto; Norihiko Sekine; Akifumi Kasamatsu; Iwao Hosako
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Paper Abstract

In the recent progress in terahertz (THz) devices, various kinds of source devices, such as resonant tunneling diodes, quantum cascade lasers and so forth, have been developed. Frequency measurement of THz radiations, which can operate in high speed and at room-temperature, is important for development of high-performance THz source devices. Recently, frequency measurement using optical combs are demonstrated by several groups. In these techniques, modelocked lasers (MLLs) are used for optical comb source, so that phase-locking techniques are required in order to stabilize the repetition frequency of the MLLs. On the other hand, a modulator-based optical comb generator has high accuracy and stability in the comb spacing, which is comparable to that of microwave signal driving the modulator. Thus it is suitable for frequency measurement of THz waves. In this paper, we demonstrated frequency measurement of THz waves using a Mach-Zehnder-modulator-based flat comb generator (MZ-FCG). The frequency measurement was carried out by an electro-optic (EO) sampling method, where an optical two-tone signal extracted from the optical comb generated by the MZ-FCG was used for the probe light. A 100 GHz signal generated by a W-band frequency multiplier and the probe beam collinearly traveled through an EO crystal, and beat signals between them were measured by a combination of a balanced photodetector and a spectrum analyzer. As a result, frequency measurement of the 100 GHz wave was successfully demonstrated, in which the linewidth of the beat signal was less than 1 Hz.

Paper Details

Date Published: 25 February 2016
PDF: 6 pages
Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 97470U (25 February 2016); doi: 10.1117/12.2212541
Show Author Affiliations
Isao Morohashi, National Institute of Information and Communications Technology (Japan)
Mayu Kirigaya, Yokohama National Univ. (Japan)
Yuta Kaneko, Yokohama National Univ. (Japan)
Ikufumi Katayama, Yokohama National Univ. (Japan)
Takahide Sakamoto, National Institute of Information and Communications Technology (Japan)
Norihiko Sekine, National Institute of Information and Communications Technology (Japan)
Akifumi Kasamatsu, National Institute of Information and Communications Technology (Japan)
Iwao Hosako, National Institute of Information and Communications Technology (Japan)


Published in SPIE Proceedings Vol. 9747:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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