Semiconductor laser control circuit which sets the optical outpu

Details Semiconductor laser control circuit which sets the optical outpu Semiconductor laser control circuit which sets the optical outpu

1997-01-27

1999-03-23

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 25, H01S 300

Patent

active

058870105

ABSTRACT:
Test light emitting operation is performed in test zones or manufacturer zones formed across 100 or more tracks in a non-user area in an inner or outer disk portion. The optical output power is set successively for output currents Iw0, Iw1, and Iw2 during the above test light emitting operation. In an operation in a write mode, a CPU sets a W0-D/A converter, a W1-D/A converter, W2-D/A converter so that a W0-constant current circuit, a W1-constant current circuit, and a W2-constant current circuit can provide currents in accordance with the outputs of the respective D/A converters. Three switches are turned on and off in response to write data thereby supplying a driving current to a laser diode. Thus, the laser diode is driven by a multiple-level driving current using a simple low-frequency-band circuit without having to perform power setting operation in an ALPC area of an optical recording medium.

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