Optical network unit for error detection and recovery of optic module and control method thereof

A method of controlling an optical network unit, the method comprising the steps of:

• transmitting, by a passive optical network medium access control (PON MAC) unit, data together with an optical output control signal to an optical module;
• detecting, by a monitor photodiode, an optical signal output from a laser diode and generating a feedback signal;
• and
• determining, by an error detection controller, whether optical signal output operation is abnormal based on the status of the optical output control signal and the feedback signal.

A system for controlling the output of an optical network unit comprising:

• a medium access control module providing a control signal for a known time slot;
• an optical module unit comprising a laser diode and a photo-detector, the optical module unit receiving said control signal for activating a laser diode, and said photo-detector generating a feedback signal in response to light generated by said laser diode;
• an error detector receiving said control signal and said feedback signal and generating a power control signal based on the received control signal and feedback signal;
• and
• a power control module receiving said power control signal to interrupt power to said optical module unit.