Patent
WDM optical communication systems with wavelength stabilized optical selectors
Victor Mizrahi,Stephen R. Harmon +1 more
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TLDR
In this article, an optical detector and feedback loop is used to optimize the wavelength of an optical selection element in accordance with a wavelength of the incident optical channel, which is a Bragg grating associated with a grating wavelength controller, such as a temperature regulator or strain tuning system.Abstract:
The present invention provides a wavelength division multiplexed optical communication system with dynamically stabilized wavelength selectors. To accurately correlate the wavelength of a wavelength selector to the wavelength emitted by an optical transmission source, the present invention uses an optical detector and feedback loop to optimize the wavelength of an optical selection element in accordance with a wavelength of an incident optical channel. In one embodiment, the optical selection element is a Bragg grating associated with a grating wavelength controller, such as a temperature regulator or strain tuning system, to adjust the wavelength band of maximum reflectivity of the grating. The feedback loop communicates with the optical detector and the wavelength controller to modify the grating's reflection wavelength band in accordance with the wavelength of an incident optical channel.read more
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References
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Patent
Incorporated bragg filter temperature compensated optical waveguide device.
William Morey,Walter L. Glomb +1 more
TL;DR: In this article, a temperature compensated embedded grating optical waveguide light filtering device is proposed, in which light is guided toward a core portion of a predetermined limited length that has embedded therein a multitude of grating elements extending with a substantially equal longitudinal spacing substantially normal to the longitudinal axis and collectively constituting a grating that reflects, of the light propagating in the path toward and reaching the gating elements, that of a wavelength within a narrow range about a central wavelength determined by the spacing of the grating element and by the index of refraction of the material of the core
Patent
Variable optical fiber bragg filter arrangement
TL;DR: In this article, a variable light filtering arrangement with a waveguiding core and a permanent Bragg grating region is presented, where at least one of the periodicity and refractive index variations of the grating regions is controlledly modified in such a manner as to temporarily change the central wavelength within a predetermined wavelength range.
Patent
Distributed, spatially resolving optical fiber strain gauge.
TL;DR: In this article, a distributed, spatially resolving optical fiber strain gauge in which the core of the optical fiber is written with periodic grating patterns effective for transmitting and reflecting light injected into the core is presented.
Patent
Embedded optical sensor capable of strain and temperature measurement using a single diffraction grating
James R. Dunphy,Gerald Meltz,Mauro Varasi,Antonello Vannucci,Mario Signorazzi,Pietro Ferraro,Sabato Inserra Imparato,Claudio Voto +7 more
TL;DR: In this paper, an embedded optical sensor has a plurality of layers (10-20) and an optical fiber (21) with a fiber grating (28), disposed between the layers (14, 16).
Patent
Distributed multiplexed optical fiber bragg grating sensor arrangement
TL;DR: In this paper, the authors propose an arrangement for determining the magnitudes of selected physical quantities at a multitude of spaced locations, comprising an elongated optical fiber having a waveguiding core and including several separate longitudinally spaced Bragg sensing gratings of substantially identical initial periodicity.