Non-etalon wavelength locking optical sub-assembly and associated methods
US6717682B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2001 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Jul 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J9/0246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A wavelength detector includes an optical structure receiving an input beam, the optical structure outputting at least three wavelength dependent two-beam interference signals. Each wavelength dependent two-beam interference signal has a different phase offset. A detector receives the at least three wavelength dependent two-beam interference signals and outputs an electrical signal representative of each wavelength dependent two-beam interference. A processor receives the at least three electrical signals from the detector and generates a composite control signal. Alternatively, two of the three signals are periodic with respect to wavelength and the third signal is a reference signal. The two-beam interference signals may be created by providing patterned apertures in respective beam paths. Phase shifting interferometry techniques may be used to determine the wavelength from the periodic signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.