49-fold Self-phase Modulation Induced Spectrum Compression of Picosecond Pulses in Dispersion-shifted Telecom Fiber

We conduct an experimental and numerical study on a self-phase modulation induced spectrum compression dynamics of negatively chirped picosecond pulses in the low-loss dispersion-shifted telecom fiber near its zero dispersion wavelength. By fiber length and peak power optimization, record 49-fold spectrum compression of 38 ps, 2.1 nJ negatively chirped Gaussian pulses with compressed spectrum width of 0.23 nm and ≈50% energy confinement at 1560 nm wavelength was achieved, leading to ≈13-times spectral brightness magnification.