| 摘要 |
An optical wavelength division multiplex recording and reproduction apparatus records information by creating a recording hole at a pre-determined wavelength position on a memory element (16). A further memory element (26) has at least one pre-recorded hole and is accessed with a secondary beam split off from the main beam used for recording and reproducing information. Signals derived from the light transmitted or reflected by the further element (26) are used to detect and control the wavelength position of a hole to be recorded or reproduced. |
