Parallel Use of Dispersion Devices for Resolution Improvement of Optical Quantization at High Sampling Rate

Tomotaka NAGASHIMA  Takema SATOH  Petre CATALIN  Kazuyoshi ITOH  Tsuyoshi KONISHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.7   pp.787-794
Publication Date: 2014/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.787
Type of Manuscript: Special Section PAPER (Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
Photonic analog-to-digital conversion,  optical signal processing,  soliton self-frequency shift (SSFS),  self-phase modulation (SPM),  

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Summary: 
We investigate resolution improvement in optical quantization with keeping high sampling rate performance in optical sampling. Since our optical quantization approach uses power-to-wavelength conversion based on soliton self-frequency shift, a spectral compression can improve resolution in exchange for sampling rate degradation. In this work, we propose a different approach for resolution improvement by parallel use of dispersion devices so as to avoid sampling rate degradation. Additional use of different dispersion devices can assist the wavelength separation ability of an original dispersion device. We demonstrate the principle of resolution improvement in 3 bit optical quantization. Simulation results based on experimental evaluation of 3 bit optical quantization system shows 4 bit optical quantization is achieved by parallel use of dispersion devices in 3 bit optical quantization system. The maximum differential non-linearity (DNL) and integral non-linearity (INL) are 0.49 least significant bit (LSB) and 0.50 LSB, respectively. The effective number of bits (ENOB) estimated to 3.62 bit.