Bidirectional optical module and optical time domain reflectometer equipped with the bidirectional optical module
US7889331B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 23, 2007 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Aug 2, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3127
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A bidirectional optical module according to the present invention comprises light emitting elements 110, 130 that emit light to enter an optical fiber 71, a light receiving element 190 that receives light having exited the optical fiber 71 and a light branching element 160 that guides the light having exited the optical fiber 71 onto the light receiving element 190. It further includes a stray light shielding member 185 disposed between the light branching element 160 and the light receiving element 190 and having formed therein an opening 186, through which the light to enter the light receiving element 190 passes. The stray light shielding member 185 blocks stray light 100b while light 100a having exited the fiber 71 passes through the opening 186. Therefore, any increase in the extent of error in the detection of the returning light level or the position of a reflecting point is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.