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This discussion concerns the requirements for a format used in digital optical recording, specifically the 5 -1/4" form factor. An implementation, based upon a fully sampled approach, is described in detail.

Operation of a semiconductor laser amplifier simultaneously as phase modulator and optical switch is proposed. Theoretical and experimental results on performance in saturation are reported.

Generally optical discs are divided into several sectors in which an amount of data is stored. Each sector starts with a header which contains an address and synchronization information. If, because of aging of the disc, this sync-info is destroyed, one needs a backup for having access to the data in that sector. A convenient way of attaining this is to have a prerecorded clock (a depth modulation of the pregroove) in the disc. Using this clock, a defect-insensitive phase lock loop and a counter, the sync-info of previous sectors can be used to reach the data in the damaged sector.

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