Optical Correlation Domain Reflectometry Based on Coherence Synchronization: Theoretical Analysis and Proof-of-Concept

Okamoto, Tatsuya; Iida, Daisuke; Toge, Kunihiro; Manabe, Tetsuya

doi:10.1109/jlt.2016.2590507

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…Although kilometer-order measurement range has been achieved [ 22 ], the size and insert loss are considerably large if the FUT is extended to tens of kilometers. In [ 23 ], external phase modulation is introduced to remove the periodic correlation peaks caused by using a comb source. A theoretical spatial resolution of 10.5 mm is realized over 100 m FUT, but the sensing position is scanned by the variable optical delay line, as is the case for OLCR.…”

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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Section: Introductionmentioning

confidence: 99%

External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range

Xue

Niu

Shangqing

2021

Sensors

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“…These drawbacks are also found in optical correlationdomain reflectometry (OCDR), [18][19][20][21][22][23] which is a Fresnelreflection-based technique for detecting low-quality connections, splices, and damaged parts along an optical fiber. We have developed a new OCDR configuration based on an external modulation scheme, in which, instead of directly modulating the driving current of a laser, the optical frequency is modulated using an electro-optic modulator (EOM).…”

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confidence: 99%

First demonstration of Brillouin optical correlation-domain reflectometry based on external modulation scheme

Noda

Lee

Mizuno

2019

Jpn. J. Appl. Phys.

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We demonstrate basic operation of Brillouin optical correlation-domain reflectometry (BOCDR) based on an external modulation scheme, which can mitigate three demerits of a conventional direct modulation scheme. A 0.8 m long strain in a 2.8 m long silica fiber is successfully detected in a distributed manner. This scheme can be employed not only in BOCDR but also in Brillouin optical correlation-domain analysis.

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“…Two of its successful configurations are optical time-domain reflectometry (OTDR) [5][6][7][8][9] and optical frequency-domain reflectometry (OFDR), [10][11][12][13][14] both of which have the limitations of insufficient spatial resolution and relatively low measurement speed, and phase fluctuations caused by environmental disturbance, respectively. To mitigate these shortcomings, optical correlation (or coherence)-domain reflectometry (OCDR) [15][16][17][18][19][20][21][22][23][24][25] based on a synthesized optical coherence function (SOCF) 22) has been developed and extensively studied. Among the many SOCF-OCDR configurations using directly modulated laser outputs [17][18][19][20][21][22] and optical frequency combs, 23,24) those based on direct sinusoidal modulation of the laser outputs [17][18][19] can be most cost-efficiently implemented.…”

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confidence: 99%

Simplified optical correlation-domain reflectometry employing proximal reflection point

Shizuka

Lee

Hayashi

et al. 2016

Jpn. J. Appl. Phys.

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We develop a new configuration of simplified optical correlation-domain reflectometry using a proximal reflection point. The experimental setup is basically composed of standard silica fibers and includes neither an optical frequency shifter such as an acousto-optic modulator nor an explicit reference path. The light reflected at the proximal reflection point, which is artificially fabricated near an optical circulator, is used as the reference light. Unlike the conventional silica-based setup, this configuration can perform a distributed reflectivity measurement along the distal half of the sensing fiber. After demonstration of the basic operation, the incident optical power dependence of the reflectivity distribution is investigated, and the existence of the optimal incident power is clarified.

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Optical Correlation Domain Reflectometry Based on Coherence Synchronization: Theoretical Analysis and Proof-of-Concept

Cited by 11 publications

References 20 publications

External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range

External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range

First demonstration of Brillouin optical correlation-domain reflectometry based on external modulation scheme

Simplified optical correlation-domain reflectometry employing proximal reflection point

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