Diffraction grating with reduced polarization-dependent loss
First Claim
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1. A diffraction grating for diffracting an optical signal of wavelength λ
- in an interference order m, the diffraction grating comprising;
a substrate;
a plurality of reflective faces oriented at respective blaze angles θ
b spaced along a surface of the substrate at a grating density 1/d, wherein the blaze angles θ
b substantially differ from the Littrow condition sin θ
b =φ
/2d; and
a plurality of support walls positioned to support each of such reflective faces and connected with the surface of the substrate such that the optical signal is reflected essentially only off the reflective faces and not off the support walls.
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Abstract
A diffraction grating that achieves high diffraction efficiency at all polarizations for optical signals at telecommunications wavelengths is provided. The diffraction grating has a substrate and a plurality of reflective faces oriented at respective blaze angles θb spaced along the substrate surface, with the blaze angles substantially differ from the Littrow condition. Each reflective surface is supported by a support wall connected substantially with the substrate surface.
25 Citations
32 Claims
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1. A diffraction grating for diffracting an optical signal of wavelength λ
- in an interference order m, the diffraction grating comprising;
a substrate;
a plurality of reflective faces oriented at respective blaze angles θ
b spaced along a surface of the substrate at a grating density 1/d, wherein the blaze angles θ
b substantially differ from the Littrow condition sin θ
b =φ
/2d; and
a plurality of support walls positioned to support each of such reflective faces and connected with the surface of the substrate such that the optical signal is reflected essentially only off the reflective faces and not off the support walls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27, 28, 29)
- in an interference order m, the diffraction grating comprising;
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14. A method for diffracting an optical signal of wavelength λ
- in an interference order m, the method comprising;
propagating the optical signal towards a plurality of reflective faces oriented at respective blaze angles θ
b spaced along a surface of a substrate at a grating density 1/d and supported by a plurality of support walls, wherein the blaze angles θ
b substantially differ from the Littrow condition sin θ
b=mλ
/2d ; and
reflecting the optical signal essentially only off the reflective faces and not off the support walls. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 30, 31, 32)
- in an interference order m, the method comprising;
Specification
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Current AssigneeAltera Corporation (Intel Corporation)
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Original AssigneeNetwork Photonics, Inc.
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InventorsSarto, Tony, Fabiny, Larry
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Primary Examiner(s)HENRY, JON W
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Application NumberUS09/615,300Time in Patent Office789 DaysField of Search359/571, 359/572, 359/569, 359/298, 359/130, 385/37US Class Current359/571CPC Class CodesG02B 5/1809 with pitch less than or com...G02B 5/1861 Reflection gratings charact...
