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Carrier-Suppressed Single Sideband Signal for FMCW LiDAR Using a Si Photonic-Crystal Optical Modulators

We have studied frequency-modulated continuous-wave (FMCW) light detection and ranging which uses externally modulated light instead of a wavelength-chirped laser diode and a complicated clock sampling circuit. In this method, the FMCW beat signal is accompanied by a 3 dB average loss in principle when pseudo frequency-modulated light simply generated by an intensity modulation with frequency-swept signals is used. In this article, we first fabricated a Si in-phase/quadrature-phase modulator equipped with compact photonic-crystal phase shifters and generated carrier-suppressed single sideband modulation signals. Furthermore, we obtained almost ideal frequency modulation, with a side-mode suppression ratio of 22.3 dB, by temporally controlling the frequency and phase of the modulation signals. When the FMCW beat signal was produced with this modulated signal in a fiber delay interferometer, its intensity was increased by 5.3 dB, as compared with that using intensity modulation. This improvement corresponds to an 80% increase in the limit distance of FMCW ranging. We also generated similar signals using a single modulator with a bypass waveguide, which simplified modulation. The side-mode suppression ratio for the frequency-swept modulation was limited to 9.8 dB, while comparably large increase in the beat intensity was confirmed.

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Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.38 No.8 April 15 2020

No. Panggil

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Penerbit

: .,

Deskripsi Fisik

p. 2315 - 2321

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PHOTONIC CRYSTAL
OPTICAL MODULATOR
SILICON PHOTONICS
SINGLE SIDEBAND
FMCW LIDAR

Info Detail Spesifik

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Pernyataan Tanggungjawab

Mikiya Kamata, Yosuke Hinakura, Toshihiko Baba

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