Optical performance monitors
US6633371B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2002 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Jun 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/33
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for wavelength control and measurement are disclosed. An optical signal to be measured is tapped off a portion thereof referring to as a source signal. Together with a reference signal, the source signal is coupled to a tunable filter. The frequency response or passing band of the tunable filter is so controlled that one wavelength &lgr;x from the source signal and one wavelength &lgr;rx from the reference signal transmit through. Relying on a band separation filter, the wavelength &lgr;rx is separated from the reference signal and coupled to a gas cell of a known spectrum, a filtered signal of the wavelength &lgr;rx is then coupled to a photo-detector for subsequent electrical measurement. In accordance with the known spectrum, the wavelength &lgr;x can be precisely derived.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.