Laser diode driving circuit
US6392215B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1999 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Sep 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved laser diode driving circuit is disclosed which includes a current source, an operational amplifier, a light sensing device, a current mirror, and a constant current source. The current source is coupled to the laser diode for biasing the laser diode. The operational amplifier has an output coupled to the current source for driving the current source. The operational amplifier includes a first and a second input. The first input is coupled to a reference voltage. The second input receives a feedback signal. The light sensing device is coupled to a first supply voltage for detecting a portion of an optical power output from the laser. The light sensing device generates a monitor current proportional to the detected optical power output. The current mirror is coupled to the light sensing device and the second input of the operational amplifier. The current mirror receives the monitor current and generates a mirror current which is substantially equal to the monitor current. The constant current source is coupled to the second input of the operational amplifier for outputting a reference current. The reference current and the mirror current are then utilized to generate the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.