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Yuta KAIHORI Yu YAMASAKI Tsuyoshi KONISHI
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.
Takema SATOH Kazuyoshi ITOH Tsuyoshi KONISHI
We report a trial of 100-GS/s optical quantization with 5-bit resolution using soliton self-frequency shift (SSFS) and spectral compression. We confirm that 100-GS/s 5-bit optical quantization is realized to quantize a 5.0-GHz sinusoid electrical signal in simulation. In order to experimentally verify the possibility of 100-GS/s 5-bit optical quantization, we execute 5-bit optical quantization by using two sampled signals with 10-ps intervals.
Takashi NISHITANI Tsuyoshi KONISHI Kazuyoshi ITOH
We propose and demonstrate the all-optical analog-to-digital conversion (ADC) using optical delay line encoders. Experimental results show that input analog signals are successfully converted into 3-bit digital signals at a bit rate of 40 Gb/s.
Recently, the research on all-optical analog-to-digital conversion (ADC) has been extensively attempted to break through inherently limited operating speed of electronic devices. In this paper, we describe a novel quantization scheme by slicing supercontinuum (SC) spectrum for all-optical ADC and then propose a 2-bit all-optical ADC scheme consisting of the quantization by slicing SC spectrum and the coding by switching pulses with a nonlinear optical loop mirror (NOLM). The feasibility of the proposed quantization scheme was confirmed by numerical simulation. We conducted proof-of-principle experiments of optical quantization by slicing SC spectrum with an arrayed waveguide grating and optical coding by switching pulses with NOLM. We successfully demonstrated optical quantization and coding, which allows us to confirm the feasibility of the proposed 2-bit ADC scheme.