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Optical comb for generation of a continuously tunable coherent THz signal from 122.5 GHz to > 2.7 THz

Ponnampalam, L; Fice, M; Shams, H; Renaud, C; Seeds, A; (2018) Optical comb for generation of a continuously tunable coherent THz signal from 122.5 GHz to > 2.7 THz. Optics Letters , 43 (11) pp. 2507-2510. 10.1364/OL.43.002507. Green open access

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Abstract

We present a continuously tunable optical frequency comb generator (OFCG), with comb lines spanning over 3.8 THz which, to the best of our knowledge, is the widest span yet reported for a single-phase modulator OFCG system. The line spacing, exactly determined by a microwave reference, can be continuously tuned and, by heterodyning two lines, enables the generation of a continuously tunable electrical signal from 122.5 GHz to >2.7  THz. The composite noise of the heterodyne between two lines has been measured up to a record frequency of 300 GHz and is −75  dBc/Hz at 10 kHz offset at 300 GHz, limited by the multiplied phase noise of the reference synthesizer.

Type: Article
Title: Optical comb for generation of a continuously tunable coherent THz signal from 122.5 GHz to > 2.7 THz
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OL.43.002507
Publisher version: https://doi.org/10.1364/OL.43.002507
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10059356
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