Dynamic control for laser diode drivers
US6021143A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1998 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Apr 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dynamic laser diode drive circuit is formed so that the gain of the final gain stage is controlled in association with the level of the drive current supplied to the laser diode. In particular, the current sources associated with the final gain stage and the output stage and commonly controlled so that the gain tracks the current level. That is, in situations required a relatively low current, the gain is minimized to prevent overdriving the output stage (a situation common in prior art arrangements). When a larger laser drive current is required, the gain of the final stage is adjusted to increase the output from this stage and provide a sufficient voltage differential to drive the output stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.