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US 10,310,148 B2Granted
Systems and methods of aberration correction in optical systems
AssigneeFinisar Corporation
InventorsLuke Stewart, Glenn Wayne Baxter, Steven James Frisken
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Abstract
Described herein is a diffraction grating (1) for use in an optical system. The diffraction grating includes a substrate (2) and an array of elongate diffracting elements (3) arranged in a grating profile across the substrate. The grating profile imparts a predefined phase change to optical beams to at least partially correct the beams for optical aberrations present in the optical system.
Claims28
A diffraction grating for use in a multi-wavelength channel optical system comprising a plurality of individual wavelength channels, the grating including:
- a substrate;
- and
- an array of diffraction elements written onto the substrate and having a spacing of adjacent diffraction elements defined so as to spatially separate the individual wavelength channels from an incident optical beam, wherein each diffraction element comprises a curvature across the face of the grating, and wherein the spacing of adjacent diffraction elements and the curvature of each of the diffraction elements across the face of the grating are defined so as to impart predefined phase changes to the wavelength channels to at least partially correct the incident optical beams for optical aberrations present in the optical system.
A multi-wavelength optical switch, including:
- at least one input optical fiber port for projecting an input optical beam comprising a plurality of individual wavelength channels from a connected input optical fiber;
- at least one output optical fiber port for projecting an output optical beam to a connected output optical fiber;
- a lens and/or mirror for focusing or collimating the input optical beam in one or more dimensions;
- switching optics for selectively switching the input optical beam along predetermined paths between the at least one input port and the at least one output port;
- and
- a diffractive device including a substrate and an array of diffraction elements physically written onto the substrate and having a spacing of adjacent diffraction elements, wherein each diffraction element comprises a curvature across the face of the grating, the array of spaced-apart diffraction elements is configured to:
- i) spatially separate the individual wavelength channels within the input optical beam;
- and
- ii) impose predefined phase changes to the wavelength channels to at least partially correct for optical aberrations to the input optical beam, the output from the diffractive device being the output optical beam.
6 more elements
Dependencies are inferred from the claim text.