Optical waveguide circuit, its manufacturing method and optical waveguide module having the optical waveguide circuit
US6304687A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 14, 1998 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Oct 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/12028
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a light waveguide circuit including a plurality of waveguides having different length, a material (10) having a temperature coefficient of a refractive index including a symbol different from that of a temperature coefficient of an effective refractive index of the waveguide (4) is charged into a groove (12) formed by removing the upper clad and the core from the waveguide (4), or a groove (12) formed by removing the upper clad, the core and the lower clad from the waveguide (4). A difference in length of the removed portions between adjacent waveguides is proportional to a difference in length of the waveguides which were not removed and remained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.