Simultaneous interrogation of multi wavelength-modulated...

Optical waveguides – Optical waveguide sensor

Reexamination Certificate

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C356S478000

Reexamination Certificate

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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.

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