Apparatus for interrogating an optical signal
US6917735B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2001 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Nov 7, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/1206
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus (10) for interrogating an optical signal (not shown) propagating in an optical waveguide, such as an optical fiber, having an input section (12) and a second section (14) through which light entering from the input section (12) will subsequently propagate. The second section (14) includes a grating portion, such as a tilted chirped fiber Bragg grating (16). The grating (16) causes at least part of the optical signal to be coupled out of the optical fiber, through the fiber cladding. A photodetector (18) is provided generally alongside the grating (16). The photodetector (18) is arranged to collect and detect substantially all of the outcoupled optical signal. The relationship between the optical power outcoupled by the grating (16) and the wavelength of the optical signal is known, allowing a measurement of the outcoupled optical power to be used to determine the wavelength of the optical signal propagating through the grating (16).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.