Semiconductor laser drive circuit with peak detection and contro

Details Semiconductor laser drive circuit with peak detection and contro Semiconductor laser drive circuit with peak detection and contro

1985-07-25

1987-10-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214C, 369116, G01V 132

Patent

active

047016094

ABSTRACT:
A semiconductor laser drive circuit functioning as a light source of an optical recording/reproducing apparatus using an optical disk. In the recording mode, the input light of a semiconductor laser is modulated by a recording signal, the output light of the semiconductor laser is detected as a monitor signal by a photo sensitive device, the peak value of this monitor signal is held by a peak-hold circuit, a differential compensation control signal is obtained from the output of the peak-hold circuit and is fed back, and a photo control system to control the output light to a constant level is constituted, thereby controlling in such a way that the output light of the semiconductor laser becomes a certain constant modulation amplitude. Even upon recording, the output light can be stably controlled within a wide temperature range even if the characteristic of the semiconductor laser changes with the elapse of time. Also, this drive circuit can be realized by a simple arrangement.

REFERENCES:
patent: 4507767 (1985-03-01), Takasugi
patent: 4523089 (1985-06-01), Maeda et al.
patent: 4562567 (1985-12-01), Frankfort et al.
patent: 4598198 (1986-07-01), Fayfield

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