Fiberoptic transmitter using thermistor to maintain stable operating conditions over a range of temperature
US6055252A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1998 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Sep 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06804
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Techniques for controlling the operation of a laser diode to maintain optimum operating characteristics (i.e., fairly constant output power and extinction ratio) despite the fact that the threshold current and slope efficiency vary greatly over a the desired range of operating temperature. A laser driving circuit includes a bias current generator, a temperature-dependent modulation current generator, and a switching element for switching the modulation current on and off in accordance with a desired input pattern. The modulation current is caused to vary with temperature in a manner that compensates for the fact that the laser diode's slope efficiency varies with temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.