Waveguide-based Bragg gratings with spectral sidelobe suppression and method thereof
US6950577B2 · kind B2 · utility
1Cited by
38References
14Claims
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Key dates
| Filing date | Jul 1, 2002 |
| Grant date | Sep 27, 2005 |
| Priority date | — |
| Expiry date | Dec 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A waveguide Bragg grating (WBG) is apodized by varying the duty cycle of selected grating periods while fixing the pitch of the grating periods. In one embodiment, the WBG is implemented in a silicon substrate using polysilicon filled trenches of varying width while keeping the grating periods' pitch constant. The polysilicon trenches are formed so that if the width of one trench is increased compared to an adjacent grating period, the trench width in the other adjacent grating period (if present) is decreased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.