Periodic electromagnetic waveguide structures with controlled polarization properties
US6912331B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2002 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Oct 3, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
By judicious engineering of grating parameters such as tooth shape, duty cycle and phase offset, the grating strengths and effective indices of the polarization modes of a grated waveguide are adjusted over a wide range of values to achieve a desired level of polarization sensitivity, or insensitivity. In the typical example, the physical geometry of the grating teeth is adjusted so that degenerate behavior (nTE=nTM and κTE=κTM) is obtained for two polarization modes; the effective refractive indices and grating strengths are matched for the TE and TM polarization modes. In the current embodiment the sidewall gratings are used in which the tooth profile is selected in order to equalize the grating strength for each polarization mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.