High frequency modulation of a light beam in optical recording

Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...

Reexamination Certificate

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C369S116000

Reexamination Certificate

active

08045438

ABSTRACT:
An optical storage system modulates a laser beam based on a high frequency modulation (HFM) signal and a pattern to be recorded on an optical storage medium. At least one of an amplitude and a frequency of the HFM signal is adjusted when using the light beam to record the pattern on the optical storage medium or read data from the medium.

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Biesterbos et al., “Low-Frequency Mode-Hopping Optical Noise in AIGaAs Channeled Substrate Lasers Induced by Optical Feedback”, IEEE Journal of Quantum Electronics, vol. QE-19, No. 6, pp. 986-990 (Jun. 1983).

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