Large-scale and structure-tunable laser spectral compression in an optical dispersion-increasing fiber.

Laser spectral compression by a factor of 102.8 is experimentally achieved through optical soliton propagation in a dispersion-increasing fiber. By varying the input pulse energy, the wavelength tuning range of the compressed spectral peak could exceed 115 nm. Spectrally compressed spectrum with two bright peaks is demonstrated for the first time, to our knowledge. The structure of the dual-peaked compressed spectra is adjustable through the interplay of initial pulse chirp and energy. All of the experimental data are compared to numerical results and are found in good agreement.