The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Nous décrivons la réflectométrie FMCW pour la caractérisation des fibres optiques longues en utilisant une diode laser à cavité externe comme source de lumière. Étant donné que la différence de chemin optique entre le faisceau de référence et le faisceau réfléchi provenant de la fibre optique testée est beaucoup plus longue que la longueur de cohérence de la source lumineuse, les faisceaux de référence et réfléchis sont décorrélés de phase. En conséquence, le spectre de battement entre la référence et les faisceaux réfléchis est mesuré. Dans la réflectométrie FMCW à décorrélation de phase, la résolution spatiale est améliorée en rétrécissant la largeur de raie spectrale de la source lumineuse et en augmentant la fréquence de répétition du balayage de fréquence optique ainsi qu'en augmentant la plage de gazouillis du balayage de fréquence optique. Dans les expériences, un laser DFB à cavité externe est utilisé comme source de lumière à largeur de raie étroite, et la fréquence optique est balayée par une modulation infime de la longueur de la cavité externe. De longues fibres optiques monomodes sont caractérisées, et la plage de mesure maximale de 80 km est atteinte, et les résolutions spatiales de 46 m, 100 m et 2 km sont atteintes à 5 km, 11 km et 80 km de distance, respectivement. La rétrodiffusion Rayleigh est clairement mesurée et la perte de propagation de la fibre optique est également mesurée. Le gain optique d'un amplificateur à fibre optique dopé à l'erbium (EDFA) est également estimé à partir de la modification du niveau de rétrodiffusion de Rayleigh dans la fibre optique suivie après l'EDFA.
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Koichi IIYAMA, Takahiro MAEDA, Saburo TAKAMIYA, "Phase-Decorrelated FMCW Reflectometry for Long Optical Fiber Characterization by Using a Laser Diode with Modulated External-Cavity" in IEICE TRANSACTIONS on Electronics,
vol. E83-C, no. 3, pp. 428-434, March 2000, doi: .
Abstract: We describe FMCW reflectometry for characterization of long optical fibers by using an external-cavity laser diode as a light source. Since the optical path difference between the reference beam and the reflected beam from the optical fiber under test is much longer than the coherence length of the light source, the reference and the reflected beams are phase-decorrelated. As a result, the beat spectrum between the reference and the reflected beams is measured. In the phase-decorrelated FMCW reflectomety, the spatial resolution is enhanced by narrowing the spectral linewidth of the light source and increasing the repetition frequency of the optical frequency sweep as well as increasing the chirping range of the optical frequency sweep. In the experiments, an external-cavity DFB laser is used as a narrow linewidth light source, and the optical frequency is swept by minute modulation of the external cavity length. Long single mode optical fibers are characterized, and the maximum measurement range of 80 km is achieved, and the spatial resolutions of 46 m, 100 m and 2 km are achieved at 5 km, 11 km and 80 km distant, respectively. The Rayleigh backscattering is clearly measured and the propagation loss of optical fiber is also measured. The optical gain of an erbium-doped optical fiber amplifier (EDFA) is also estimated from the change in the Rayleigh backscattering level in the optical fiber followed after the EDFA.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e83-c_3_428/_p
Copier
@ARTICLE{e83-c_3_428,
author={Koichi IIYAMA, Takahiro MAEDA, Saburo TAKAMIYA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Phase-Decorrelated FMCW Reflectometry for Long Optical Fiber Characterization by Using a Laser Diode with Modulated External-Cavity},
year={2000},
volume={E83-C},
number={3},
pages={428-434},
abstract={We describe FMCW reflectometry for characterization of long optical fibers by using an external-cavity laser diode as a light source. Since the optical path difference between the reference beam and the reflected beam from the optical fiber under test is much longer than the coherence length of the light source, the reference and the reflected beams are phase-decorrelated. As a result, the beat spectrum between the reference and the reflected beams is measured. In the phase-decorrelated FMCW reflectomety, the spatial resolution is enhanced by narrowing the spectral linewidth of the light source and increasing the repetition frequency of the optical frequency sweep as well as increasing the chirping range of the optical frequency sweep. In the experiments, an external-cavity DFB laser is used as a narrow linewidth light source, and the optical frequency is swept by minute modulation of the external cavity length. Long single mode optical fibers are characterized, and the maximum measurement range of 80 km is achieved, and the spatial resolutions of 46 m, 100 m and 2 km are achieved at 5 km, 11 km and 80 km distant, respectively. The Rayleigh backscattering is clearly measured and the propagation loss of optical fiber is also measured. The optical gain of an erbium-doped optical fiber amplifier (EDFA) is also estimated from the change in the Rayleigh backscattering level in the optical fiber followed after the EDFA.},
keywords={},
doi={},
ISSN={},
month={March},}
Copier
TY - JOUR
TI - Phase-Decorrelated FMCW Reflectometry for Long Optical Fiber Characterization by Using a Laser Diode with Modulated External-Cavity
T2 - IEICE TRANSACTIONS on Electronics
SP - 428
EP - 434
AU - Koichi IIYAMA
AU - Takahiro MAEDA
AU - Saburo TAKAMIYA
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E83-C
IS - 3
JA - IEICE TRANSACTIONS on Electronics
Y1 - March 2000
AB - We describe FMCW reflectometry for characterization of long optical fibers by using an external-cavity laser diode as a light source. Since the optical path difference between the reference beam and the reflected beam from the optical fiber under test is much longer than the coherence length of the light source, the reference and the reflected beams are phase-decorrelated. As a result, the beat spectrum between the reference and the reflected beams is measured. In the phase-decorrelated FMCW reflectomety, the spatial resolution is enhanced by narrowing the spectral linewidth of the light source and increasing the repetition frequency of the optical frequency sweep as well as increasing the chirping range of the optical frequency sweep. In the experiments, an external-cavity DFB laser is used as a narrow linewidth light source, and the optical frequency is swept by minute modulation of the external cavity length. Long single mode optical fibers are characterized, and the maximum measurement range of 80 km is achieved, and the spatial resolutions of 46 m, 100 m and 2 km are achieved at 5 km, 11 km and 80 km distant, respectively. The Rayleigh backscattering is clearly measured and the propagation loss of optical fiber is also measured. The optical gain of an erbium-doped optical fiber amplifier (EDFA) is also estimated from the change in the Rayleigh backscattering level in the optical fiber followed after the EDFA.
ER -