Radiation characteristic measuring apparatus for laser diode
US4798950A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1986 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Sep 4, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/4257
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring a radiation characteristic of a laser diode. An AC signal and a step-like DC voltage are applied to the laser diode and the radiant power output thereof is received by a photodiode having an output to which a first amplifier, a transformer, a capacitor and an AC amplifier for extracting the AC signal. The apparatus further comprises a first switch connected between the input of the first amplifier and the capacitor, and a second switch connected between both ends of the transformer. Every time the step-like voltage is stepped up, the first and second switches are closed for a short time as compared with the duration of a step period to protect the measurement from the influence of the change in the DC voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.