Processing method for position and light of built-in tilt Bragg raster containing optical waveguide

Abstract

The invention is commonly (widely or generally) characterized in being an optical device, where a light waveguide is in the optical device and an inclined grating is in the optical device to couple in one or plural irradiating beams through guide mode; light irradiated from the inclined grating is focused into intermediate image in the preset position on a middle image plane, and the position of the intermediate image depends on light wavelength and effective refractive index of the guide mode. And the invention can place a spatial light modulator to control phase and / or amplitude of light beam. More remarkably, the invention comprises a last-stage focusing device to focus light transmitted by the spatial light modulator into last stage image in local region, so as to improve light strength, i.e. improving detecting sensitivity, where the last- stage focusing device can be a lens. And the invention also comprises a light receiver, which can be a optical fiber detector, or a last-stage image detecting light detector array.

Description

technical field [0001] The invention relates to a tilted Bragg (Bragg) grating embedded in an optical waveguide and the detection and processing of optical signals. Background technique [0002] In fiber optic communication and sensor systems, a tilted fiber Bragg grating embedded in an optical waveguide is an effective way to couple the guided light inside the waveguide out of the optical waveguide. Tilted Braggs have many potential applications, for example: wavelength monitors, optical spectrum analyzers (OSAs) or for measuring the modal power distribution of multimode waveguides. [0003] Spectrum analyzer is an important experimental instrument commonly used in the fields of chemistry, physics and biology. Improving the sensitivity and resolution of optical spectrum analyzers can improve the ability to analyze the structure and concentration of materials, expand the capacity and reliability of optical communication systems, and provide the ability to sense weak signals...

AI Technical Summary

Problems solved by technology

[0004] Until now, it has been difficult to measure the mode power distribution of multimode fibers

Although the mode power distribution of multimode fibers can be obtained by near-field or far-field measurements, this method relies on the prior acquisition of the refractive index profile, fiber end-face quality, and alignment of the optical system, making this method difficult to apply

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