Design of a 1.65- mu m-band optical time-domain reflectometer

Takasugi, H.; Tomita, Nobuo; Nakano, Junichi; Atobe, N.

doi:10.1109/50.251170

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…However, the quantum fluctuation (QF), [6,7] which may limit the signal to noise ratio (SNR) R SNR of photon counting measurement, has not been considered. [3,8] In this paper, we perform an OTDR measurement of standard telecom fibres by single photon detection, using photon counts modulation and lock-in technology to eliminate the influence of QF and thus improve the SNR of OTDR.…”

Section: Introductionmentioning

confidence: 99%

Photon counts modulation in optical time domain reflectometry

王晓波¹,

王晶晶²,

张国锋³

et al. 2011

Chinese Phys. B

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The quantum fluctuation of photon counting limits the field application of optical time domain reflection. A method of photon counts modulation optics time domain reflection with single photon detection at 1.55 µm is presented. The influence of quantum fluctuation can be effectively controlled by demodulation technology since quantum fluctuation shows a uniform distribution in the frequency domain. Combined with the changing of the integration time of the lock-in amplifier, the signal to noise ratio is significantly enhanced. Accordingly the signal to noise improvement ratio reaches 31.7 dB compared with the direct photon counting measurement.

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Section: Introductionmentioning

confidence: 99%

Photon counts modulation in optical time domain reflectometry

王晓波¹,

王晶晶²,

张国锋³

et al. 2011

Chinese Phys. B

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“…Therefore, by using the 1.6 urn band for optical transmission line maintenance it becomes possible to detect anomalies in optical cables before fatal faults occur. Consequently, there have been some recent reports related to the design and performance of a 1.6 μιη band OTDR [2][3][4]. If we can use a wavelength tunable OTDR instead of a single wavelength OTDR, we can also determine whether there is water penetration into the optical connector splice [5], and we can measure splice loss from one fiber end only [6].…”

Section: Introductionmentioning

confidence: 99%

A Tunable 1.6 μm Band Optical Time-domain Reflectometer

Sato¹,

Horiguchi²,

Koyamada³

1998

Journal of Optical Communications

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A tunable 1.6 μιη band optical time-domain reflectometer (OTDR) is reported which uses a tunable Raman fiber laser (RFL). The RFL optical peak power of 7 W at 1652 nm was obtained by using a tunable Q-switched Er 3+ -doped fiber ring laser (QERL) as a pump light source, and a Raman fiber with a small mode field diameter. By using this RFL, an OTDR dynamic range over 22.5 dB was achieved in the wavelength region from 1650 nm to 1680 nm with a spatial resolution of 100 m.

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“…The optical TX is typically a semiconductor laser diode [4], [11], [13]. In PONs, most of the time, inexpensive isolatorless Fabry-Pérot lasers are preferred, which is fit for echo acquisition on the laser diode and backfacet photodiode.…”

Section: A Excitation Signalmentioning

confidence: 99%

Nonintrusive Fiber Monitoring of TDM Optical Networks

Mulder

Chen

Bauwelinck

et al. 2007

J. Lightwave Technol.

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Abstract-This paper introduces a new embedded nonintrusive fiber-monitoring technique for time-division-multiplexing optical networks. It allows an optical transmitter to characterize the fiber plant from reflections caused by data bursts transmitted across the network instead of dedicated test signals. The probing is performed with minimal burden on data traffic so that many measurements can be averaged to improve accuracy. The method is very suitable for embedded optical time-domain reflectometers (OTDR), which reuse a network node's optical data transmitter for OTDR excitations and embed a reflectometer inside the fiber endpoint. This paper models the OTDR with Laplace transforms, an approach previously unpursued, after which it is explained how reflections from multiple data bursts with arbitrary width can be converted into one normalized format. This new class of OTDR excites the fiber with a negative step of light instead of the conventional short pulse. The signal-to-noise ratio (SNR) for backscatter and Fresnel reflections caused by the negative step and pulse are compared theoretically. It is shown that negative-step OTDR breaks the tradeoff between excitation pulsewidth and distance resolution, has a natural separation between fiber backscatter and Fresnel reflectors, and improves the SNR of nonreflective events.

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Design of a 1.65- mu m-band optical time-domain reflectometer

Cited by 5 publications

References 9 publications

Photon counts modulation in optical time domain reflectometry

Photon counts modulation in optical time domain reflectometry

A Tunable 1.6 μm Band Optical Time-domain Reflectometer

Nonintrusive Fiber Monitoring of TDM Optical Networks

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