IEICE TRANSACTIONS on Electronics
Excellent Linearly Frequency-Swept Light Source for Sensing System Utilizing FMCW Technique
Summary :
We propose and demonstrate an excellent linearly frequency-swept laser diode (LD) for sensing system utilizing frequency-moduleted continuous-wave (FMCW) technique. In order to linearly sweep the optical frequency, we adopt a reference interferometer and an electric phase comparator. The interference beat signal of the reference interferometer is phase-compared with an external reference rectangular signal having a fixed frequency near the interference beat signal frequency by a lock-in amplifier. The error signal from the lock-in amplifier is fed back to the modulating signal of the injection current of the LD. Thus, a phase-locked loop composed of optical and electric circuits can be established, and the beat signal frequency is locked to the frequency of the reference signal. The optical frequency of the LD is, therefore, excellently linearly swept in time. In order to experimentally confirm the linearlity of the proposed method, we apply this light source to the FMCW reflectometry. Resultingly, the improvement of the linearity is estimated to be about 10 dB. And the theoretically limited spatial resolution of the FMCW reflectometry is achieved.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E77-C No.11 pp.1716-1721
- Publication Date
- 1994/11/25
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- Special Section PAPER (Special Issue on Electromagnetic Theory)
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Lu-Tang WANG, Koichi IIYAMA, Ken-ichi HAYASHI, "Excellent Linearly Frequency-Swept Light Source for Sensing System Utilizing FMCW Technique" in IEICE TRANSACTIONS on Electronics,
vol. E77-C, no. 11, pp. 1716-1721, November 1994, doi: .
Abstract: We propose and demonstrate an excellent linearly frequency-swept laser diode (LD) for sensing system utilizing frequency-moduleted continuous-wave (FMCW) technique. In order to linearly sweep the optical frequency, we adopt a reference interferometer and an electric phase comparator. The interference beat signal of the reference interferometer is phase-compared with an external reference rectangular signal having a fixed frequency near the interference beat signal frequency by a lock-in amplifier. The error signal from the lock-in amplifier is fed back to the modulating signal of the injection current of the LD. Thus, a phase-locked loop composed of optical and electric circuits can be established, and the beat signal frequency is locked to the frequency of the reference signal. The optical frequency of the LD is, therefore, excellently linearly swept in time. In order to experimentally confirm the linearlity of the proposed method, we apply this light source to the FMCW reflectometry. Resultingly, the improvement of the linearity is estimated to be about 10 dB. And the theoretically limited spatial resolution of the FMCW reflectometry is achieved.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e77-c_11_1716/_p
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@ARTICLE{e77-c_11_1716,
author={Lu-Tang WANG, Koichi IIYAMA, Ken-ichi HAYASHI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Excellent Linearly Frequency-Swept Light Source for Sensing System Utilizing FMCW Technique},
year={1994},
volume={E77-C},
number={11},
pages={1716-1721},
abstract={We propose and demonstrate an excellent linearly frequency-swept laser diode (LD) for sensing system utilizing frequency-moduleted continuous-wave (FMCW) technique. In order to linearly sweep the optical frequency, we adopt a reference interferometer and an electric phase comparator. The interference beat signal of the reference interferometer is phase-compared with an external reference rectangular signal having a fixed frequency near the interference beat signal frequency by a lock-in amplifier. The error signal from the lock-in amplifier is fed back to the modulating signal of the injection current of the LD. Thus, a phase-locked loop composed of optical and electric circuits can be established, and the beat signal frequency is locked to the frequency of the reference signal. The optical frequency of the LD is, therefore, excellently linearly swept in time. In order to experimentally confirm the linearlity of the proposed method, we apply this light source to the FMCW reflectometry. Resultingly, the improvement of the linearity is estimated to be about 10 dB. And the theoretically limited spatial resolution of the FMCW reflectometry is achieved.},
keywords={},
doi={},
ISSN={},
month={November},}
Copy
TY - JOUR
TI - Excellent Linearly Frequency-Swept Light Source for Sensing System Utilizing FMCW Technique
T2 - IEICE TRANSACTIONS on Electronics
SP - 1716
EP - 1721
AU - Lu-Tang WANG
AU - Koichi IIYAMA
AU - Ken-ichi HAYASHI
PY - 1994
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E77-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 1994
AB - We propose and demonstrate an excellent linearly frequency-swept laser diode (LD) for sensing system utilizing frequency-moduleted continuous-wave (FMCW) technique. In order to linearly sweep the optical frequency, we adopt a reference interferometer and an electric phase comparator. The interference beat signal of the reference interferometer is phase-compared with an external reference rectangular signal having a fixed frequency near the interference beat signal frequency by a lock-in amplifier. The error signal from the lock-in amplifier is fed back to the modulating signal of the injection current of the LD. Thus, a phase-locked loop composed of optical and electric circuits can be established, and the beat signal frequency is locked to the frequency of the reference signal. The optical frequency of the LD is, therefore, excellently linearly swept in time. In order to experimentally confirm the linearlity of the proposed method, we apply this light source to the FMCW reflectometry. Resultingly, the improvement of the linearity is estimated to be about 10 dB. And the theoretically limited spatial resolution of the FMCW reflectometry is achieved.
ER -
English
