Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2011-08-23
2011-08-23
Le, Uyen-Chau N (Department: 2874)
Optical waveguides
Optical waveguide sensor
C250S227140, C250S227180, C356S073100, C356S300000, C356S301000, C359S326000, C359S327000
Reexamination Certificate
active
08005323
ABSTRACT:
A method and apparatus for generating and transmitting high energy optical pulses are described. Distributed temperature sensors usually use Raman scattering in optical fibers as the means to determine the temperature. Here, light from a laser source is sent down a fiber and the small amount of light that is scattered back towards the source is analysed. As the fiber length increases, the resolutions of the temperature and loss measurements become poorer. This is because losses in an optical fiber attenuate the signal. An obvious solution to this problem is to launch more light into the fiber to compensate for the losses but stimulated Raman scattering limits how much light may be launched. The present invention solves this problem by using a pulse conversion method to maximize the resultant pulse energy while the power is kept below SRS threshold.
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Farhadiroushan Mahmoud
Kean Peter Neil
Parker Tom Richard
Barkume & Associates, P.C.
Le Uyen-Chau N
Prince Kajli
Sensornet Limited
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