Power control circuit for laser diode having wavelength compensation
US6947458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2001 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Jun 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0687
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A control circuit for a laser diode includes a power controller and a wavelength controller. The power controller adjusts a bias current to the laser diode to change the power output of the laser diode. The power change can have a corresponding wavelength shift effect on the nominal operating wavelength of the laser diode. The wavelength controller compensates for the wavelength shift such that the laser diode maintains operation at the nominal wavelength. The circuit provides for electrical control of the laser output power without the need for a costly and bulky optical attenuator. The circuit also provides wavelength control to compensate for the relationship between laser diode operating temperature and wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.