Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2007-10-16
2007-10-16
Connelly-Cushwa, Michelle (Department: 2874)
Optical waveguides
Optical waveguide sensor
C356S478000
Reexamination Certificate
active
11214783
ABSTRACT:
A compact interrogator for the simultaneous interrogation of multi wavelength-modulated fiber optical sensors, includes a planar waveguide based demultiplexer receiving input signals from the sensors. An array of detectors is coupled to output waveguides of the demultiplexer corresponding to different nominal wavelengths. A tuning element matches the nominal wavelengths of the output waveguide to the input signals from the respective sensors to find the wavelengths of the individual sensors to be interrogated.
REFERENCES:
patent: 6643419 (2003-11-01), Chang et al.
patent: 2004/0033004 (2004-02-01), Welch et al.
Fast Optical Wavelength Interrogator Employing Arrayed Waveguide Grating For Distributed Fiber Bragg Grating Sensors-Journal of Lightwave Technology vol. 21, No. 1 Jan. 2003—Yasukazu Sano and Toshihiko Yoshino.
Extended range interrogation of wavelength division multiplexed fibre Bragg grating sensors using arrayed waveguide grating—Electronics Letters Nov. 27, 2003, vol. 39 No. 24, D.C.C. Norman, D.J. WEbb and R.D. Pechstedt.
Grover Chander P.
Lu Zhenguo
Sun Fengguo
Xiao Gaozhi
Zhang Zhiyi
(Marks & Clerk)
Connelly-Cushwa Michelle
Mitchell Richard J.
National Research Council of Canada
Rahll Jerry T.
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