OTDR system using Raman amplification of a 1.65 [micro sign]m probe pulse

Lees, G.P.; Kee, H.H.; Newson, T.P.

doi:10.1049/el:19970688

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…One of the most widely used techniques is fiber-optic reflectometry based on Fresnel reflection. Two of its major configurations are optical time-domain reflectometry (OTDR) [1,2,3,4,5] and optical frequencydomain reflectometry (OFDR) [6,7,8,9,10]. OTDR, however, generally suffers from its insufficient spatial resolution and relatively long measurement time, whereas OFDR is susceptible to phase fluctuations caused by environmental disturbance.…”

Section: Introductionmentioning

confidence: 99%

Simplified optical correlation-domain reflectometry using polymer fiber

Hayashi

Shizuka

Minakawa

et al. 2015

IEICE Electron. Express

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We develop a simplified configuration of optical correlation-(or coherence-) domain reflectometry (OCDR) using a polymer optical fiber (POF). The conventional reference light path is removed by using as reference light the Fresnel-reflected light caused at the interface between a silica single-mode fiber and the POF. We demonstrate its basic operation and investigate the dependences of the spatial resolution and signal-to-noise ratio (SNR) on the sweep time of the laser modulation frequency. The optimal sweep time is found to be 30 ms (corresponding to a repetition rate of 33 Hz), at which both the resolution and SNR are maintained at high values.

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Section: Introductionmentioning

confidence: 99%

Simplified optical correlation-domain reflectometry using polymer fiber

Hayashi

Shizuka

Minakawa

et al. 2015

IEICE Electron. Express

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“…Optical reflectometry technologies, including optical time domain reflectometry (OTDR) [ 1 , 2 , 3 , 4 ], optical frequency domain reflectometry (OFDR) [ 5 , 6 , 7 , 8 , 9 ], and optical coherent domain reflectometry (OCDR) [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], have been widely used in the monitoring of fiber link and distributed sensing applications. The OTDR simply measures the round-trip time of reflection and Rayleigh backscattering (RBS) of the probe pulse.…”

Section: Introductionmentioning

confidence: 99%

External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range

Xue

Niu

Shangqing

2021

Sensors

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Optical coherent domain reflectometry (OCDR) can achieve a high spatial resolution that is independent of the bandwidth of the receiver, but the measurement range is usually very limited. Here we propose an external modulation OCDR system, in which a pair of linear frequency-modulated pulses generated by one modulator are employed as the probe pulse and the reference, respectively. The spatial resolution is determined by the frequency modulation range of the pulse, and the measurement speed is boosted by orders because the proposed technology can simultaneously diagnose a section of fiber with each pair of pulses, while only a single point can be accessed at a time in typical OCDR. In the demonstrational experiment, a measurement range of up to 50 km is achieved with a spatial resolution of 1.4 m and a measuring time of less than 30 s.

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“…ne of the useful techniques for monitoring the soundness of optical components, modules, and fiber networks is optical reflectometry, which has been used to perform multiplexed sensing, 1,2) distributed sensing, [3][4][5] and optical coherence tomography. [6][7][8] To detect low-quality connections (or splices) and other reflection points along an optical fiber, optical time-domain reflectometry (OTDR) [9][10][11][12][13] and optical frequency-domain reflectometry (OFDR) [14][15][16][17][18] have been widely studied. However, OTDR suffers from a relatively low spatial resolution determined by the optical pulse width and a long measurement time, and OFDR generally suffers from phase fluctuations caused by environmental disturbance; in addition, random access to sensing positions is not available in these techniques.…”

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confidence: 99%