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Fast Acquirable Brillouin Optical Time-Domain Reflectometry Based on Bipolar-Chirped Pulse Pair

In this article, fast measurement of Brillouin optical time-domain reflectometry (BOTDR) based on a linearly frequency modulated (LFM) pulse and a digital matched filter is studied theoretically and demonstrated experimentally. The Brillouin frequency shift (BFS) change is detected by measuring the time shift of the Brillouin gain spectrum (BGS) along the time axis instead of the frequency shift, as in traditional BOTDR. In the experiment, we propose to use a positive- and negative-swept pulse, named bipolar-chirped pulse pair (BPP), to determine the BFS change with high accuracy. A BGS acquisition of up to 320 Hz is obtained for a fiber length of 2 km with a strain measurement accuracy of ±8 με. Strain measurements in a range of up to 10000 με are conducted, and the resulting strain coefficient is equal to 0.048 MHz/MHz/με, which matches that of standard single-mode fibers. The BPP-BOTDR technique is an intrinsic one-end-injection truly distributed system that exhibits high measurement speed and high accuracy, which may pave the way for various BOTDR applications.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.39 No.12 June 15 2021

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 3941 - 3949

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

BRILLOUIN OPTICAL TIME-DOMAIN REFLECTOMETRY
LINEARLY FREQUENCY MODULATED PULSE
FAST MEASUREMENT SPEED
HIGH ACCURACY

Info Detail Spesifik

DOI: 10.1109/JLT.2020.3042237

Pernyataan Tanggungjawab

Pengbai Xu, Chao Pang, Xinyong Dong, Yuwen Qin, Yongkang Dong

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