Journal
NEXT-GENERATION SPECTROSCOPIC TECHNOLOGIES XII
Volume 10983, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2517938
Keywords
Fiber optics sensors; Optical sensing and sensors; Fiber Bragg gratings; Integrated Optics Devices; Spectrometers and spectroscopic instrumentation; Wavelength filtering devices
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We report on a multi-channel wavelength interrogator for the 850 nm wavelength region, constructed by coupling an integrated array of multi-mode, tapered hollow waveguides to a low-cost silicon-based image sensor. The waveguides are clad by omnidirectional Bragg reflectors, such that guided light is radiated in an out-of-plane direction near and at cutoff. Wavelength shifts were extracted using a simple centroid detection algorithm applied to the terminal cutoff point. This concept combines the small size of a Fabry Perot filter with the dispersive property of a diffraction grating. By imaging multiple tapered waveguides onto a single image sensor with each waveguide coupled to a different fiber, simultaneous extraction of wavelength shifts from several wavelength-multiplexed sensors can be achieved in a very compact package. The prototype described provides resolution on the order of 5 pm and can accommodate similar to 20 sensors spaced by 5 nm on each of the 4 fiber input channels. Enhanced capacity and performance are anticipated through future improvements in waveguide materials and the use of more advanced image processing algorithms.
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