Signal analyzer using tapped optical fibers
AssigneeVeridian ERIM International, Inc.
InventorCarl Aleksoff
Life of this patent
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Abstract
A signal analyzer is being developed that is based on a periodically tapped optical fiber. The spatial distribution of taps produces a waveform that is weighted by a spatial light modulator (SLM), optically Fourier transformed, and then detected with a video camera to continually display the power spectrum of the signal propagating in the fiber. Alternatively, a digital holographic technique can be implemented that avoids using a SLM. The analyzer resolution and bandwidth is dependent on the distribution and number of taps. Taps have been formed in the core of fibers using UV light. Both single step beamsplitter and localized phase grating taps have been generated. Bragg grating taps tilted at 45 degrees with respect to the fiber axis were generated in order to diffract light directly out of the side of the fiber.
Claims14
A real-time optical channelizer, comprising:
- a fiber delay radiator (FDR) formed by winding at least one optical fiber on a form, the fiber including a plurality of taps allowing the light carried by the fiber to radiate therefrom;
- an optical detector;
- and
- a two-dimensional spatial light modulator disposed in an optical path between the taps and the detector to correct at least for the phase of the light radiated by the FDR.
Dependencies are inferred from the claim text.