Laser-diode driving circuit with temperature compensation
US5761230A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1996 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | May 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser-diode driving circuit that ensures that the optical output of a laser diode will be stable within a wide temperature range. This circuit includes a reference voltage generator for generating a reference voltage, a control voltage generator for generating a control voltage, an amplifier for producing an amplified output signal corresponding to the difference between the reference voltage and the control voltage, and a driving current generator for generating a driving or operating current for driving a laser diode. The driving current generator is driven by the amplified output signal. The control voltage has a temperature dependence approximately the same as that required for keeping an optical output of the laser diode at a specified level independent of the ambient temperature change. Preferably, the control voltage generator contains a p-n junction diode for producing a temperature-dependent voltage, and a thermistor for compensating the temperature-dependent voltage to thereby produce said control voltage having an exponential characteristic with respect to the ambient temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.