High compliance laser driver
US6879608B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2003 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | May 24, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/042
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A laser driver includes two DC-coupled differential drive circuits in which the common mode voltage of the first differential drive circuit is maintained a level affording a high compliance voltage for a laser diode driven by the second differential drive circuit. This is accomplished by means of an operational amplifier which compares the common mode voltage of the second differential drive circuit to a reference voltage. The operational amplifier operates in a closed-loop configuration to draw current through a common mode bias resistor in the first differential drive circuit in order to force the common mode voltage of the second differential drive circuit to a desired value determined by the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.