Laser power control system for laser diode using dual close loops
US10559940B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2019 |
| Grant date | Feb 11, 2020 |
| Priority date | — |
| Expiry date | Apr 1, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0427
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention discloses a laser power control system includes a laser diode, a monitor photodiode, a bias control circuit, a modulation control circuit, a digital controller, and a laser diode driver. The laser power control system forms an automatic extinction ratio control loop that is configured to control the extinction ratio of the laser diode by comparing a monitor current with a first target current to keep the extinction ratio of the laser diode at the predetermined first target current. The laser power control system forms an automatic power control loop that is configured to control the average power of the laser diode by comparing the monitor current with the second target current to keep the average power of the laser diode at the predetermined second target current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.