Abstract
In this paper, we optimize a proposed 6-bit all-optical quantization approach based on soliton self-frequency shift (SSFS) and spectral compression techniques. A 10 m-long high nonlinear photonic crystal fiber (PCF) is still used as an SSFS medium relevant to the power of the sampled optical pulses. Furthermore, a 10 m-long dispersion flattened hybrid cladding hexagonal–octagonal PCF (6/8-PCF) is utilized as a spectral compression medium to realize resolution enhancement after positive or negative pre-chirp process. Simulation results show that the 6-bit quantization is still obtained when a 100 m-long dispersion-increasing fiber (DIF) is replaced by a hybrid cladding 6/8-PCF in spectral compression module.
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