Polarization-independent acoustooptically tuned spectral filter with frequency shift compensation

Tarasov, A A; Chu, Hong; Jhon, Young Min

doi:10.1109/lpt.2002.1012393

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Flow measurement is important for many applications in chemical engineering, in the energy and aerospace industries, and in medical equipment technology. Several approaches have been employed for mass flow measurement, including time of flight measurement, differential pressure measurement, and heat transfer [1][2][3][4]. The installation of a large number of flow sensors is currently very difficult and expensive.…”

Section: Introductionmentioning

confidence: 99%

Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

et al. 2010

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In this work an all-optical hot-wire flowmeter based on a silver coated fiber combining a long period grating and a fiber Bragg grating (FBG) structure is proposed. Light from a pump laser at 1480 nm propagating down the fiber is coupled by the long period grating into the fiber cladding and is absorbed by the silver coating deposited on the fiber surface over the Bragg grating structure. This absorption acts like a hot wire raising the fiber temperature locally, which is effectively detected by the FBG resonance shift. The temperature increase depends on the flow speed of the surrounding air, which has the effect of cooling the fiber. It is demonstrated that the Bragg wavelength shift can be related to the flow speed. A flow speed resolution of 0:08 m=s is achieved using this new configuration.

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Section: Introductionmentioning

confidence: 99%

Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

et al. 2010

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“…These devices have to switch from one wavelength to another very quickly to match the continuous changes in the network traffic. Tunable filters are the subject of intensive research and a wide variety of techniques are studied: tunable Bragg gratings (often in acousto-optic (AO) cells using surface waves [7][8][9] but also in fibers [10 -13]), tunable Fabry-Perot [14 -19] and diffraction gratings associated to steering devices like micromirrors [20 -22] or deflectors [23,24].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of a high-resolution fast tunable filter based on an intracavity Bragg grating

Bitauld¹,

Zaquine²,

Maruani³

et al. 2007

Appl. Opt.

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A fast tunable filtering technique is proposed associating a diffraction grating with an intracavity Bragg grating. The bandwidth and the tuning range of this filter can be easily adapted by changing the diffraction grating's orientation, or its period, and its response is uniform over the whole tuning range. A numerical simulation of the filter response to a Gaussian beam has been developed, and it fits the experimental results allowing a calculation of the performances that could be obtained with more specific elements. For example, using a commercial acousto-optic deflector would allow a separation of 500 frequencies. It would then be possible to have a tuning range of 100 nm with a bandwidth of 0.2 nm for optical telecommunications.

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Controlling Fiber Bragg Grating Spectra With In-Fiber Diode Laser Light

Chen

Cashdollar

Xu³

2004

IEEE Photon. Technol. Lett.

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Polarization-independent acoustooptically tuned spectral filter with frequency shift compensation

Cited by 5 publications

References 6 publications

Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

Numerical analysis of a high-resolution fast tunable filter based on an intracavity Bragg grating

Controlling Fiber Bragg Grating Spectra With In-Fiber Diode Laser Light

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