Efficient Spectral Compression of Wavelength-Shifting Soliton and Its Application in Integratable All-Optical Quantization

Abstract

In this paper, we numerically demonstrate efficient spectral compression (SPC) of wavelength-shifting soliton in a chalcogenide strip waveguide. It is found that the profiles of group-velocity dispersion (GVD) and Kerr nonlinearity play key roles in determining SPC. After calculating the dispersion of Kerr nonlinearity and Raman spectrum for three kinds of chalcogenide materials, Ge 11.5 As 24 Se 64.5 is chosen as the material for designing the chalcogenide strip waveguide (CSW). The geometric parameters of CSW are optimized to obtain the desired GVD and Kerr nonlinearity. Simulation results show that in the designed CSW, an input spectrum width of 52.04 nm can be compressed to 7.23 nm along with wavelength shift of 17 nm when the input peak power is 25 W. With the input peak power increasing to 75 W, the SPC is slightly weakened, but wavelength shift can be up to 190 nm. The proposed CSW is applied to integrated all-optical quantization and an effective quantization number of 3.66-bit is achieved. It is expected that our research results can find important applications in on-chip integrated spectroscopy, all-optical signal processing, etc.

ADVANCED PROGRESS ON Χ<SUP>(3)</SUP> NONLINEARITY IN CHIP-SCALE PHOTONIC PLATFORMS (INVITED REVIEW)

“…The same group further numerically studied an efficient SPC of self-frequency shifted soliton in a chalcogenide strip waveguide in 2019. The combination of SPC and SSFS were further utilized in an integratable all-optical quantization scheme [175]. The SPC and SSFS in this work were simultaneously achieved due to joint engineering of dispersion and nonlinearity.…”

“…While the quantization resolution was improved, the waveguide structure is more complicated because the cascaded structure increases the difficulty in facet coupling. To solve this problem, Mei et al proposed an integratable all-optical quantization scheme by using the efficient SPC of self-frequency shifted soliton [175].…”