Enhanced coherent OTDR for long span optical transmission lines containing optical fiber amplifiers

Furukawa, Shigeto; Tanaka, Kuniaki; Koyamada, Yahei; Sumida, M.

doi:10.1109/68.384537

Cited by 30 publications

(7 citation statements)

References 4 publications

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“…The gain variation often makes it difficult to decide the bit value in the receiver. In addition, shutdown of the input signal is unsuitable for conventional EDFAs because it sometimes causes optical surges when the input signal is recovered, which can damage the following devices in the optical system [7,8,9]. Thus, most practical EDFAs possess a safety interlock system which can automatically shut down the pump power dependent on the monitored input signal power, which complicates the whole EDFA system [10,11].…”

Section: Introductionmentioning

confidence: 99%

Gain-clamped erbium-doped fiber amplifier using a Sagnac loop and low-reflectivity fiber Bragg grating

Tsuji

Uehara

2019

IEICE Electron. Express

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A gain-clamped erbium-doped fiber amplifier (GC-EDFA) can effectively suppress gain variations and optical surges that are often induced in the amplification of optical burst signals. In this paper, we demonstrate a simple and effective GC-EDFA using a Sagnac-loop-type EDFA with a low-reflectivity fiber Bragg grating (FBG). The gainclamped characteristics and the experimental results of the dynamic response for an optical burst signal are presented.

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Section: Introductionmentioning

confidence: 99%

Gain-clamped erbium-doped fiber amplifier using a Sagnac loop and low-reflectivity fiber Bragg grating

Tsuji

Uehara

2019

IEICE Electron. Express

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“…C OHERENT optical time domain reflectometry (C-OTDR) is an important instrument for fiber characterization and fault location for long haul multi-span undersea optical transmission line monitoring [1]. The measurement DR is strongly dependent on averaging the results of a large number of measurements [2]- [6].…”

Section: Introductionmentioning

confidence: 99%

Time Division Multiplexing Optical Time Domain Reflectometry Based on Dual Frequency Probe

Zhang

Song

Liu

2012

IEEE Photon. Technol. Lett.

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A new frequency coding method is proposed and experimentally demonstrated that employs a phase modulator driven by sequential radio frequency and a synchronously controlled acoustooptic modulator to generate time division multiplexing probe pulses for coherent optical time domain reflectometry (C-OTDR). Each probe pulse contains two probe frequencies that are symmetrical regarding the frequency of local oscillator (LO). Heterodyne between the backscattered Rayleigh light of the dual frequency probe pulse and LO generates the same intermediate frequency. Experimental results show that the new C-OTDR, using ten frequency-coded probe pulses, brings an 8.0-dB dynamic range enhancement, compared with conventional C-OTDR.Index Terms-Coherent detection, frequency-coded probe pulse, optical time domain reflectometry, time division multiplexing.

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“…Coherent OTDR (COTDR) is the one developed for this situation. Many researchers have conducted analysis and experiments on it, but most of them focused on synchronous demodulation of Rayleigh backscattered signal [2][3][4][5][6][7] . In this paper, we demonstrate a COTDR based on direct demodulation using log-detector.…”

Section: Introductionmentioning

confidence: 99%

Coherent OTDR used for fibre faults detection

et al. 2009

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Enhanced coherent OTDR for long span optical transmission lines containing optical fiber amplifiers

Cited by 30 publications

References 4 publications

Gain-clamped erbium-doped fiber amplifier using a Sagnac loop and low-reflectivity fiber Bragg grating

Gain-clamped erbium-doped fiber amplifier using a Sagnac loop and low-reflectivity fiber Bragg grating

Time Division Multiplexing Optical Time Domain Reflectometry Based on Dual Frequency Probe

Coherent OTDR used for fibre faults detection

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