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Chinese Optics Letters

Real-time and ultrafast optical pulse quantization based on slicing the supercontinuum

Ya Guo, Qiang Cai, Zhiwei Jia, Bingjie Xu, Zhensen Gao, Qianwu Zhang, Ruonan Zhang, Adonis Bogris, K.A. Shore, Yuncai Wang, Pu Li

Published Jan 1, 2021• 2 citations

Abstract

All-optical analog-to-digital conversion is a paramount issue in modern science. How to implement real-time and ultrafast quantization to optical pulses with different intensities in an all-optical domain is a central problem. Here, we report a real-time demonstration of an all-optical quantization scheme based on slicing the supercontinuum in a nonlinear fiber. In comparison with previous schemes through off-line analysis of the power of different optical spectral components in the supercontinuum, this, to the best of our knowledge, is the first demonstration of such functionality online in the time domain. Moreover, the extinction ratio among the quantized outputs can exceed 10 dB, which further confirms the feasibility of the proposed quantization scheme. The current 3 bit resolution in the proof-of-principle experiment is limited by the current experimental condition, but it can be expected to be greatly enhanced through improving both the spectral width of the generated supercontinuum and the number of filtering channels used.

DOI: 10.3788/col202119.081901

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We demonstrate an all-optical quantization scheme by slicing the supercontinuum (SC) generated in the normal dispersion region of a highly nonlinear fiber. The −20 dB bandwidth of the SC is broadened from 12.9 to 49.7 nm when input average power varies from 0.062 to 0.692 mW, which is used for realizing subsequent quantization. In addition, in order to evaluate the system performance, we have calculated the values of differential nonlinear error, integral nonlinear error, and effective number of bit from the experimental results as 0.471 least significant bit (LSB), 0.519 LSB, and 4.39 bit, respectively.

All-optical analog-to-digital conversion play an important role in optical communication,it can realize the high sampling-rate,high bit-resolution by using photonic-electronic technology.All-opical quantization is a key module in all-optical analog-to-digital conversion which determine speed and resolution of the conversion directly.In this paper,we purpose a new scheme of all-optical quantization based on slicing supercontiuum spectrum and design a testifying optical circuit for simulating.The results show that the scheme is efficient for all-optical quantization.

We present an optical approach for high-speed parallel random bit generation based on stochastic pulse-to-pulse fluctuation in the supercontinuum (SC). Through spectrally demultiplexing the SC pulse sequence into different wavelength channels, we simultaneously extract multiple independent fast random bit streams from each SC pulse subsequence via associated comparators in parallel. Proof-of-concept experiments demonstrate that using our method, four 10 Gb/s random bit streams are obtained from a SC pulse source with verified randomness. Moreover, this method also provides a promising strategy to fabricate ultrafast random bit generators with Tb/s throughput capacity just by increasing additional wavelength channels.