Ultra-short Optical Pulses Measuring System Based On The Highly Nonlinear Fiber XPM-FROG

Laser technology write a history of the creation of a typical interdisciplinary invention with itsstrong vitality. Application of laser technology has been around a lot of science and technology,economic, military and social development. Ultrashort light pulses of laser technology has been ahot topic in the field, and the measurement of ultra-short light pulses is the more important part of it.This paper is gonging to design a system to measure ultra-short optical pulses, the main work is asfollows:(1) The historical development of ultrashort light pulses is described. The overview of ultrashortlight pulses and ultrashort light pulse measurement techniques are researched and reviewed.(2) The theoretical basis of the measurement of ultrashort light pulses FROG is described. Thebasic principle of frequency-resolved optical gating are described, and also the effects of severaldifferent nonlinear optical gate system is introduced, then the method is used to derive themathematical analysis of different optical-based frequency resolution of a theoretical model ofoptical gate switch measurement system.(3) The high nonlinear optical fiber measurement system based on XPM-FROG, combined withthe knowledge of nonlinear optical cross-phase modulation is discussed, the dispersioncharacteristics is taken into account, thereby the transmission of ultra-short light pulses equation issimplified. Mathematical theory on this model, using highly nonlinear optical fiber. A resolutionoptical switch (FROG) based on cross-phase modulation effect of high nonlinear fiber (XPM)ultra-short light pulse frequency measurement system is designed.(4) The designed ultra-short optical pulse measurement system theoretical mathematical isanglicized, MATLAB based system simulation program is prepared. The influencing factors(nonlinear coefficient, nonlinear interaction length, relative intensity) are discussed to confirm thatthe gate pulse power helps to improve cross-phase modulation, thereby improving the performancemeasurement system, simultaneously use high nonlinear material helps reduce the transmissionlength of the fiber.