Amplifier-assisted CRDS (cavity ring-down spectroscopy) toward compact breath sensing

Wenying Li, Yu Han, Zanhui Chen, Haisong Jiang, Kiichi Hamamoto

Research output: Contribution to journalArticle

Abstract

A cavity-ring-down spectroscopy (CRDS) system utilizing waveguide for breath sensing realizes several meter optical path integration that has possibility for ppm-order gas sensing within a compact area. We have proposed an optical amplifier assisted gas sensing system scheme to compensate waveguide propagation loss that may prevent ppm-order gas detection. The amplifier in a CRDS system, however, may result in self-lasing at specific wavelength in case of high pumping condition. Once self-lasing happens, signal light loose its gain from amplifier. The amplifier spontaneous emission that generated by an erbium-doped fiber amplifier affects the background noise level of cavity ring-down waveforms. In this work, we propose the scheme of polarization direction control so as to suspend the self-lasing, and the scheme of additional loss as to suppress ASE power. As a result, we confirmed the suppression of light intensity at a self-lasing wavelength below -50 dBm and the gain improvement of 24 dB at signal.

Original languageEnglish
Article numberSJJD01
JournalJapanese Journal of Applied Physics
Volume58
Issue numberSJ
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

lasing
amplifiers
Spectroscopy
cavities
rings
Waveguides
Gases
spectroscopy
Wavelength
Erbium doped fiber amplifiers
Light amplifiers
Spontaneous emission
gases
waveguides
aeroservoelasticity
background noise
optical paths
light amplifiers
wavelengths
Polarization

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Amplifier-assisted CRDS (cavity ring-down spectroscopy) toward compact breath sensing. / Li, Wenying; Han, Yu; Chen, Zanhui; Jiang, Haisong; Hamamoto, Kiichi.

In: Japanese Journal of Applied Physics, Vol. 58, No. SJ, SJJD01, 01.01.2019.

Research output: Contribution to journalArticle

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