Tracking of a tunable laser over output discontinuities
US7079253B2 · kind B2 · utility
5Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2003 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Oct 11, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3127
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tracking stage has an optical filter with a free spectral range greater than the maximum mode hop of a tunable laser. The free spectral range is sufficient to determine the wavelength of the laser output after the mode hop. The output is dithered or a quadrature signal is used to determine whether the mode hop is forwards or backwards. In a further embodiment, a second tracking stage with a shorter free spectral range is coupled to the tunable laser to provide enhanced wavelength resolution. Alternatively, the second tracking stage is omitted and the signal of the tracking stage is amplified to enhance wavelength resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.