A system using homodyne detection to read out signals from optical discs was simplified by using a high-coherence
laser light source. The quality of the readout signal with the simplified system was substantially greater than with
We experimentally demonstrated improvement in optical disc readout signal quality by homodyne detection. We
introduced an optical phase servo system as an alternative to the phase-diversity detection scheme for stabilization of the
interference signal in homodyne detection, which resulted in further enhancement of readout signal quality.
Experimental results indicate that at least a 16-layer recordable disc can be reliably read out with a jitter of less than 8%
at a 1-mW read power by homodyne detection. The estimated amplification of signal amplitude was 13 times.