Soliton pulse compression in air-core photonic band-gap fibre

We report the study on pulse compression using air-core photonic band-gap fibre filled with air. The distortion of the output pulse is minimised using a distortion compensating fibre (DCF) for different input and output pulse energies at different values of atomic gas pressure. In the present work, 110 m long DCF was used and the pulses from a picosecond/femtosecond pulse were linearly stretched and then recompressed in 12 m of the air-core fibre. With the band-pass filter, the output pulses were as short as 1.2 ps. The peak power obtained was 100 W with the use of the filter. The output peak power was generated using a filter by simulation and the dispersion characterisation shows that with increasing order of the input pulse, dispersion also changes in the output pulse. The simulation is done by finite difference time domain method in a soliton pulse. (author)