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InP Photonic Integrated Circuit for 6.7GHz Spaced Optical Frequency Comb Generator

Tough, EJ; Fice, MJ; Renaud, CC; Seddon, J; Seeds, AJ; Graham, C; Balakier, K; (2021) InP Photonic Integrated Circuit for 6.7GHz Spaced Optical Frequency Comb Generator. In: 2021 International Topical Meeting on Microwave Photonics (MWP). IEEE: Pisa, Italy. Green open access

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Abstract

We have demonstrated a novel approach to photonically integrated optical frequency comb generation on Indium Phosphide (InP) using generic foundry platforms. The optical comb utilized a recirculating loop technique to generate 59 comb lines (within a 20 dB power envelope) which are separated by 6.7 GHz frequency spacing. All comb lines exhibit strong phase coherence as characterized by low phase noise measurements of -105 dBc/Hz at 100 kHz. The choice of InP as an integration platform allowed for an immediate optical amplification of the modulated sideband tones. This approach reduced the requirement for external high-power RF amplifiers and therefore made the entire system more compact and power efficient. The amplified recirculating loop comb occupied 6 x 0.7 mm2 area of InP chip and consisted of electro-optic phase modulator (EOPM) and semiconductor optical amplifier (SOA) components embedded within a short (12 mm long) waveguide loop, such that the round-trip loop frequency corresponding to the loop optical length equated to 6.7 GHz. Modulation frequencies equal to the round-trip loop frequency were used to generate broad comb spans.

Type: Proceedings paper
Title: InP Photonic Integrated Circuit for 6.7GHz Spaced Optical Frequency Comb Generator
Event: 2021 International Topical Meeting on Microwave Photonics (MWP)
Dates: 15 Nov 2021 - 17 Nov 2021
ISBN-13: 9781665426107
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/MWP53341.2021.9639427
Publisher version: https://doi.org/10.1109/MWP53341.2021.9639427
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.
Keywords: Semiconductor optical amplifiers, Frequency locked loops, Frequency modulation, Stimulated emission, Phase modulation, Optical harmonic generation, Optical noise, Photonic integrated circuits, Optical frequency combs
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10144669
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