Light attenuating element and method of producing the same
US5267342A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | May 5, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3894
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light attenuating element comprising a ferrule and two optical fibers inserted through the ferrule along an optical axis thereof is disclosed. The inner ends of both the optical fibers are cut with a predetermined inclination angle and spaced from each other with a predetermined distance therebetween to obtain a required light attenuation value. A light attenuating element including an alignment sleeve into which two ferrules each having an optical fiber inserted therethrough are fitted with a predetermined distance being maintained between the foremost ends thereof is also disclosed. A method of producing a light attenuating element is practiced by way of the steps of inserting through one ferrule one optical fiber of which one end is optically connected to a light source, inserting through another ferrule another optical fiber of which one end is optically connected to a power meter, measuring a light attenuation value of the light attenuating element by the power meter, stopping the inserting operation when a required light attenuation value is obtained, cutting the optical fibers and then grinding and polishing the outer ends of the optical fibers together with the ferrules. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.