Vol. 164, Issue 2, February 2014, pp. 182-190

Abstract: Fiber laser has the characteristics of high peak power, short Pulse-width and good beam quality etc., and play a larger role in the field of laser communication, laser cutting, medical instruments etc. This paper first study on theoretical research of pulse single pulse energy, peak power, pulse width of the Q-switched fiber laser, and characteristic curve between the pulse peak power of Q- switched fiber laser and the laser shock parameters were obtained through simulation, combined with L-PPM signal model analysis the best selection of L-PPM digits in the repetition frequency of the laser under certain conditions, through the research on some important parameters such as slot width of PPM signal, length of transmission slots, length of guard slots etc., arrival at a conclusion of the modulation characteristics of PPM based on fiber laser, through theoretical analysis and experimental simulation, proved that under the condition of the lower repetition frequency PPM can provide a higher modulation rate. Obtain that when the pulse width of the fiber laser is 3 ns, the repetition frequency is 200 kHz the modulation rate of the PPM system can reach the value of 1.3 Mbit/s. From above we can know that use the fiber laser with PPM modulation method can effectively improve the modulation rate of the system.

Keywords: Optical communications, PPM modulation, Fiber laser, Q-switched., Space communication.

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