Rare earth element-doped optical waveguide and process for producing the same
US5206925A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 26, 1991 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Apr 26, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/063
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A core waveguide having a substantially rectangular cross section, with the width thereof greater than the thickness thereof, is provided in a cladding formed on a substrate, and a rare earth element-doped layer is provided in the core waveguide along the waveguiding direction of the waveguide. With the width of the core waveguide set greater than the thickness of the core waveguide, good optical confinement in the width direction of the waveguide is obtained, which enables light to be absorbed by the rare earth element-doped layer efficiently and concentratedly. It is thereby possible to achieve a marked improvement in the excitation efficiency of excitation power. Thus, an enhanced excitation efficiency is achieved with less addition of a rare earth element, and a high-gain optical amplification waveguide free of concentration extinction is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.