Compression of Femtosecond Pulses in a wide Wavelength Range Using a Large Mode Area Tapered Fiber

We report design of a tapered fiber that can be used for compression of pulses at different central wavelengths. The proposed fiber is a 3-layer W-type large-mode-area fiber, which has been tapered to transform the mode area from 1700 {\mu}m2 to 900 {\mu}m2. We determine the exact length of the maximum pulse compression and numerically demonstrate the compression of 250 fs, 100 kW peak power input pulse to 15 fs, 850 kW at 1.55 {\mu}m wavelength and 250 fs, 120 kW peak power input pulses to 28 fs, 700 kW and to 46 fs, 500 kW at 1.8 {\mu}m and 2 {\mu}m wavelengths, respectively. Such a fiber can find wide ranging applications including in communication, spectroscopy and medicine.