Signal-Readout System for Optical Pickup with Homodyne Detection Scheme
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概要
- 論文の詳細を見る
We developed a signal-readout system suitable for optical pickups with a homodyne detection scheme, which is used to amplify signal lights using optical interference. The system consists of an optical-signal detection circuit and a readout-signal generator. The optical-signal detection circuit, which contains pairs of photodiodes connected in series, successfully cancels out large DC components arising from a reference light. This made it possible to avoid the output signal saturation of current-to-voltage amplifiers and raise the upper limit of signal gain. The readout-signal generator generates a readout signal on the basis of the phase-diversity method, which stabilizes readout signal amplitude. By using this system, a signal gain of 3.6 was obtained on a commercially available disc.
- 2009-03-25
著者
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Kurokawa Takahiro
Central Research Laboratory. Hitachi Ltd.
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Miyamoto Harukazu
Central Research Laboratory Hitachi Ltd.
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Watanabe Koichi
Central Research Laboratory Hitachi Ltd.
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Ide Tatsuro
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Mikami Hideharu
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Minemura Hiroyuki
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Minemura Hiroyuki
Central Research Laboratory, Hitachi Ltd., 1-280 Higashi-koigakubo, Kokubunji-shi, Tokyo 185-6801, Japan
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Kurokawa Takahiro
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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