Patent ID: 7821890

Claim:
An apparatus for writing data to an optical storage media and making a laser diode emit light, the apparatus comprising: a servo control unit, which comprises: a control unit for controlling a burning procedure for writing the optical storage media; and a modulation unit, which is controlled by the control unit, for receiving write data and modulating the write data into a first data signal, combining the first data signal with a sequence signal, which corresponds to a first clock signal of the first data signal, to form an encoded signal, and then outputting the encoded signal; and a laser diode driver unit for receiving the encoded signal, the laser diode driver unit comprising: a PLL (Phase-Locked Loop) unit for outputting at least one of a second clock signal and a second data signal according to the encoded signal; a write strategy generation unit for outputting a control signal to control a writing operation of the laser diode according to the second clock signal and the second data signal; and a lock/unlock detection unit for detecting a state of the PLL unit and outputting a lock indicator or an unlock indicator to the control unit accordingly, the control unit starting or pausing the burning procedure according to the lock indicator or the unlock indicator, wherein: the encoded signal is composed of the first data signal and the sequence signal at different time intervals; the encoded signal is the sequence signal when the burning procedure does not start or pauses; and the encoded signal is the first data signal when the burning procedure starts.