Single mode optical waveguides of rectangular cross-section
US4776655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1986 |
| Grant date | Oct 11, 1988 |
| Priority date | — |
| Expiry date | Sep 8, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical waveguide device, suitable for coupling to optical fibers, provides a combination of narrow optical confinement and small changes in refractive index along a first axis, with broad optical confinement and large changes in refractive index along a second, perpendicular axis. A rib waveguide in which a single transverse mode beam can propagate, comprises a thin guiding layer 2 sandwiched between a pair of relatively thick confining layers 1, 3 of refractive index only slightly less than that of the guiding layer 2. The rib is etched through both the upper confining layer 3 and the guiding layer 2 and is exposed at its sides and top to air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.