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Opt Lett. 2003 Feb 1;28(3):197-9.

Arrayed waveguide Sagnac interferometer.

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Optical Communications Group, IMCO2 Research Institute, Universidad Politècnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain.


We present a novel device, an arrayed waveguide Sagnac interferometer, that combines the flexibility of arrayed waveguides and the wide application range of fiber or integrated optics Sagnac loops. We form the device by closing an array of wavelength-selective light paths provided by two arrayed waveguides with a single 2 x 2 coupler in a Sagnac configuration. The equations that describe the device's operation in general conditions are derived. A preliminary experimental demonstration is provided of a fiber prototype in passive operation that shows good agreement with the expected theoretical performance. Potential applications of the device in nonlinear operation are outlined and discussed.


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