A novel scheme for tunable optical pulse generation based on fiber sagnac loop

A novel scheme for tunable optical pulse generation based on fiber sagnac loop was proposed and studied. The key parameters of the optical pulse were analyzed and testified by experiments. The repetition rate of optical pulse is twice the frequency of external square wave modulation signal and can be tuned directly by varying modulation frequency. The maximal peak value can be achieved when the peak-peak value of the square wave modulation signal was equal to the half-wave voltage of the phase modulator. Experimental results agree well with theoretical predictions.