Optical transceiver and signal processing method thereof

A signal processing method of an optical transceiver, comprising the steps of:

• (a) providing an optical transceiver comprising a receiver optical subassembly, a transmitter optical subassembly, an amplifying module and an identifying module, wherein the amplifying module is respectively and electrically coupled to the receiver optical subassembly and the transmitter optical subassembly, and the identifying module is respectively and electrically coupled to the receiver optical subassembly and the amplifying module;
• (b) receiving an input optical signal via the receiver optical subassembly;
• (c) detecting periodically the input optical signal to identify whether or not the input optical signal includes a clock and data recovery signal by the identifying module, wherein if the identifying module detected the clock and data recovery signal for at least two times, a step (d1) is executed, and if the identifying module does not detect the clock and data recovery signal for at least two times, a step d2 is executed;
• (d1) setting the amplifying module to a high-speed mode with the identifying module, amplifying the input optical signal to an output optical signal with the amplifying module and outputting the output optical signal via the transmitter optical subassembly;
• and
• (d2) setting the amplifying module to a low-speed mode with the identifying module, amplifying the input optical signal to an output optical signal with the amplifying module and outputting the output optical signal via the transmitter optical subassembly.