Investigation on Optical Wavelength Conversion Based on SPM Using Triangular-shaped Pulses

A photonic triangular-shaped pulse train is generated based on optical subcarrier modulation and harmonic fitting. After modulated by an amplitude modulator, a single symmetrical triangle-shaped pulse is extracted to investigate the optical wavelength conversion caused by the self-phase modulation effect in a high nonlinear fiber (HNLF). Then two frequency shifts are induced and gradually separated from the original pulse frequency. The energy has been transferred to the two new frequencies efficiently and wavelength conversion is realized. It is also found that the wavelength conversion is proportional to the input power level of the triangular-shaped pulse, the fiber length and nonlinear coefficient of the HNLF and the spectra intensity evolution over time. (C) 2015 Elsevier GmbH. All rights reserved.