The FROG Ultra-short Pulses Measurement Based On Single Mode Fiber

Since the1990s, the technology of ultra-short optical pulse has developed rapidly, the super-fastcharacteristics of ultra-short pulse technique makes its application in many fields. Meanwhile, thedevelopment of the ultra-short optical pulse technology promotes the improvement of ultra-shortoptical pulse measurement technology and the advent of new measuring method. More and moreresearch results show that the measurement of ultra-short optical pulse is urgently needed in thedevelopment of the ultra-short optical pulse in growing body of research and practice. Presently, themain measurement methods of ultra-short pulses are autocorrelation measurement method, theFROG measuring and SPIDER method. In comparison, the FROG method which is simple andeffective method can the measure of the amplitude and phase of pulses under test, but it need opticalcalibration. Therefore, we design the FROG ultra-short pulse measurement scheme based on singlemode fiber using polarization mode dispersion and nonlinear effects of single mode fiberrespectively to realize the function of delay lines and nonlinear effects. The main content of thisarticle is:(1)The theoretical premise of the FROG ultra-short pulse measuring scheme which based onsingle mode fiber is analyzed in detail. The measuring scheme is mainly based on the polarizationmode dispersion and non-linear characteristics of single mode fiber and frequency resolution opticalswitch (FROG) measurement method. Therefore, polarization mode dispersion characteristics insingle mode fiber and its causes, nonlinear characteristics, and the propagation equation ofultra-short pulses in single-mode fiber are firstly analyzed. Then the principle and algorithm of theFROG measurement are introduced. Those theories described above provide reliable theoreticalbasis for the FROG ultra-short pulse measurement scheme based on single mode fiber;(2) In the precondition of theory of single-mode fiber and FROG, the measuring methods ofFROG ultra-short pulse measurement system based on single mode optical fiber is built, then themechanism of the measurement scheme is analyzed, which theoretically proved that the measuringscheme is feasible. To further prove the results, the influence of the parameters on the systemperformance is discussed;(3) The FROG ultra-short pulse measurement scheme based on single mode optical fiber ismainly simulated. According to the principle of FROG algorithm, the simulation flow chart, and theMatlab language, the simulation program is written, which can verify the feasible of the measurement scheme experimentally, and through which the parameter changes on the experimentalresults for further verification. The simulation results show that the FROG ultra-short pulsemeasurement scheme based on single mode fiber is feasible experimentally.