Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2006-04-13
2010-02-23
Chowdhury, Tarifur (Department: 2886)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
Reexamination Certificate
active
07667849
ABSTRACT:
An optical sensing method transmits radiation from a source onto an optical link, the radiation being passed through an unbalanced interferometer connected between the source and the link. The radiation which is reflected back and has travelled through a portion of the link which is subject to an external disturbance is received and passed through the same unbalanced interferometer. A detector is used to detect the radiation that has returned through the unbalanced interferometer. To improve sensitivity, the unbalanced interferometer includes a coupler for coupling radiation to the detector, the coupler being an N ×N coupler where N is an integer greater or equal to 3.
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Internationa
Healey Peter
Sikora Edmund S. R.
British Telecommunications public limited company
Chowdhury Tarifur
Cook Jonathon D
Nixon & Vanderhye P.C.
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