Apparatus for interrogating an optical signal

Details Apparatus for interrogating an optical signal Apparatus for interrogating an optical signal

2005-07-12

2005-07-12

Healy, Brian (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S027000, C398S025000

Reexamination Certificate

active

06917735

ABSTRACT:
Apparatus (10) for interrogating an optical signal (not shown) propagating in an optical waveguide, such as an optical fiber, having an input section (12) and a second section (14) through which light entering from the input section (12) will subsequently propagate. The second section (14) includes a grating portion, such as a tilted chirped fiber Bragg grating (16). The grating (16) causes at least part of the optical signal to be coupled out of the optical fiber, through the fiber cladding. A photodetector (18) is provided generally alongside the grating (16). The photodetector (18) is arranged to collect and detect substantially all of the outcoupled optical signal. The relationship between the optical power outcoupled by the grating (16) and the wavelength of the optical signal is known, allowing a measurement of the outcoupled optical power to be used to determine the wavelength of the optical signal propagating through the grating (16).

REFERENCES:
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patent: 5850302 (1998-12-01), Strasser et al.
patent: 5864641 (1999-01-01), Murphy et al.
patent: 5892582 (1999-04-01), Bao et al.
patent: 5974212 (1999-10-01), Saekj
patent: 0 495 413 (1992-07-01), None
patent: 1 130 712 (2001-09-01), None

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