Analog recording technologies available to optical disc systems

Kimihiro Saito

doi:10.1117/12.2528232

30 August 2019 Analog recording technologies available to optical disc systems

Kimihiro Saito

Proceedings Volume 11125, ODS 2019: Industrial Optical Devices and Systems; 1112505 (2019) https://doi.org/10.1117/12.2528232
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The efficiency of a communication channel is basically determined by its signal to noise ratio. Digital data is reliable but its rigorous waveform has extra information. So, it should occasionally be converted to an analog modulated signal suitable for the channel. I have demonstrated an application and improvement of the Orthogonal Frequency Division Multiplexing (OFDM) method to optical disc systems. The frequency sub-band separation scheme not only has the advantage of the efficient use of the channel, but also seems to be valid for perturbations in practical use of optical disc systems. I will discuss about the tolerance of the OFDM readout to the perturbations such as defocus, disc tilt and so on. Some variations of sub-band separation and improvements such as the suppression of peak to average power ratio is another issue. In order to implement the OFDM for an optical disc system, it is necessary to perform analog signal recording. One of the method available is the Delta-Sigma conversion method. Using this method, an analog signal is converted to a binary digital waveform that can be used to modulate the light pulses for recording. However, the recording characteristics of media is not linear in general. An arrangement of the method in addition to the simulation with a typical optical recording model will be discussed.

Conference Presentation

Citation Download Citation

Kimihiro Saito "Analog recording technologies available to optical disc systems", Proc. SPIE 11125, ODS 2019: Industrial Optical Devices and Systems, 1112505 (30 August 2019); https://doi.org/10.1117/12.2528232

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