Semiconductor laser driving apparatus with filter to...

Details Semiconductor laser driving apparatus with filter to... Semiconductor laser driving apparatus with filter to...

2005-08-16

2005-08-16

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

C369S053300, C369S053370

Reexamination Certificate

active

06930968

ABSTRACT:
A semiconductor laser driving apparatus for directing light to an optical disc for recording a recording mark based on a recording current and reproducing the recording mark to generate a reproduction signal. The apparatus includes a reproduction current generation section; a high frequency current generation section for generating a current including a high frequency component for reducing semiconductor laser noise in the reproduction; a recording current generation section, the recording current including a pulse corresponding to the recording mark and including a plurality of multi-pulses; and a current driving section for amplification. The apparatus further includes a filter to attenuate the enhanced high frequency components in the high frequency current and in the enhanced high frequency component; and a switching section for switching the filter so that the enhanced component in the recording current is superposed on at least one of the multi-pulses.

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