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13 May 2019 A wavelength interrogator employing tapered hollow waveguides and a low-cost silicon board camera
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Abstract
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 ~ 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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© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Timothy R. Harrison, Graham J. Hornig, Jorge Marin, Lintong Bu, Seyed Azmayesh-Fard, Duncan G. Elliott, and Raymond G. DeCorby "A wavelength interrogator employing tapered hollow waveguides and a low-cost silicon board camera", Proc. SPIE 10983, Next-Generation Spectroscopic Technologies XII, 109830B (13 May 2019); https://doi.org/10.1117/12.2517938
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