Laser driver oscillation requirement: Reading data

[smlogan]

Hi,

I am trying to understand the requirements of a blue-violet laser driver when reading a Blu-ray disc. Based on my reading of documents on this site, I believe I understand the timing requirements for the write operation. However, when reading a Blu-ray disc, it seems the laser driver must operate at a much higher oscillation frequency than for the "write" operation as the photodiode may miss recorded marks if the laser is turning on and off at the "write speed". For example, for the 1X rate, teh laser driver must write data at 36 Mb/sec. However, it seems the oscillation frequency of the driver must be much greater than 36 MHz to read the same data.

If I may ask, does anyone have any insight into the requirement laser driver oscillation frequency when reading a 1X or 2X Blu-ray disc?

Thank you very much for any information anyone may have.

Shawn