Optical fibre cavity for ring-down experiments with low coupling losses

Fabian, Matthias; Lewis, Elfed; Newe, Thomas; Lochmann, Steffen

doi:10.1088/0957-0233/21/9/094034

Cited by 31 publications

(18 citation statements)

References 24 publications

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“…The output signal is read (1) through the oscilloscope or (2) by the OTDR. In the first case, the output signal of the OTDR is used only as optical modulated source .…”

Section: Resultsmentioning

confidence: 99%

Chirped fiber bragg grating cavity ring-down for strain sensing using an OTDR

Silva

Passos

Marques

et al. 2015

Microw. Opt. Technol. Lett.

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This work presents a fiber cavity ring down (CRD) configuration for the measurement of strain. An optical time-domain reflectometer (OTDR) was used to send impulses down into the fiber loop cavity, inside of which a chirped fiber Bragg grating was placed to act as a strain sensing element. This technique could provide strain results with both conventional CRD-based configuration and the OTDR. The CRD configuration provided a linear response to strain applied in the range 0-2000 le, and a sensitivity of 1.34 ns/le was obtained. For the same operation range, the OTDR interrogation allowed obtaining a periodic behavior due to fiber Bragg grating scanning of the wavelength peaks of the multimode laser source while increasing strain. It is shown that the OTDR interrogation method provide a ring-down time response of about 8 ls which is a great improvement when compared to the conventional CRD configuration (23 ls).

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“…The output signal is read (1) through the oscilloscope or (2) by the OTDR. In the first case, the output signal of the OTDR is used only as optical modulated source .…”

Section: Resultsmentioning

confidence: 99%

Chirped fiber bragg grating cavity ring-down for strain sensing using an OTDR

Silva

Passos

Marques

et al. 2015

Microw. Opt. Technol. Lett.

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“…The LPG placed inside the fiber loop cavity was written by UV in SMF28e with a period of 335 nm and a length of 25 mm. A commercial OTDR (Yokogawa AQ7270) is used to send impulses down into the fiber cavity, instead of the usual laser and modulator setup [17]. The train of pulses is coupled via 1% arm of the input optical coupler, rings around inside the fiber loop and is coupled out via 1 % arm of the output coupler; the amplitude of the output pulses decay temporally due to the total existing losses in the fiber loop (fiber loss, fiber couplers insertion losses, LPG transmission attenuation), passes through a photodetector (gain of 50 dB) and is monitored in an oscilloscope.…”

Section: Resultsmentioning

confidence: 99%

Curvature sensing using an added-signal in a fiber optic cavity ring-down system

et al. 2015

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This work presents a fiber-optic Cavity Ring-Down (CRD) configuration using an added-signal for curvature sensing. An Optical Time-Domain Reflectometer (OTDR) was used to send impulses down into the fiber loop cavity, inside of which a long period grating (LPG) was placed to act as sensing device. The added-signal was obtained by the sum of several conventional CRD impulses, thus providing an improvement on the curvature sensitivity when compared to the conventional CRD signal processing. Sensitivity to applied curvature of 15.3 μs/m -1 was obtained. This result was found to be 20-fold the one obtained for the conventional CRD signal processing.

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“…The output signal is read (1) through the oscilloscope or (2) by the OTDR. In the first case, the output signal of the OTDR is used only as optical modulated source [17]. To perform strain measurements, the chirped FBG was fixed at two points that were 200 mm apart, and submitted to specific strain values by means of a translation stage (via sequential 20 m displacements).…”

Section: Resultsmentioning

confidence: 99%