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A high degree of freedom in spectral domain allows us to accommodate additional optical signal processing for wavelength division multiplexing in photonic analog-to-digital conversion. We experimentally verified a spectral compression to save a necessary bandwidth for soliton self-frequency shift based optical quantization through the cascade of the four-wave mixing based and the sum-frequency generation based spectral compression. This approach can realize 0.03 nm individual bandwidth correspond to save up to more than 85 percent of bandwidth for 7-bit optical quantization in C-band. key words: photonic analog-to-digital conversion, optical quantization, spectral compression, four-wave mixing, sum-frequency generation

Available Spectral Space in C-Band Expansion Remaining After Optical Quantization Based on Intensity-to-Lambda Conversion