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Comprehensive research on self phase modulation based optical delay systems |
| Yang Ai-Ying(杨爱英)† and Sun Yu-Nan(孙雨南) |
| School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract This paper comprehensively investigates the properties of self phase modulation based optical delay systems consisting of dispersion compensation fibre and highly nonlinear fibres. It researches into the impacts of power level launched into highly nonlinear fibres, conversion wavelength, dispersion slope, modulation format and optical filter bandwidth on the overall performance of optical delay systems. The results reveal that, if the power launched into highly nonlinear fibres is fixed, the time delay generally varies linearly with the conversion wavelength, but jumps intermittently at some conversion wavelengths. However, the time delay varies semi-periodically with the power launched into highly nonlinear fibres. The dispersion slope of highly nonlinear fibres has significant influence on the time delay, especially for the negative dispersion slope. The time delay differs with modulation formats due to the different combined interaction of nonlinearity and dispersion in fibres. The bandwidth of the optical filters also greatly affects the time delay because it determines the bandwidth of the passed signal in the self phase modulation based time delay systems. The output signal quality of the overall time delay systems depends on the conversion wavelength and input power level. The optimisation of the power level and conversion wavelength to provide the best output signal quality is made at the end of this paper.
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Received: 22 March 2010
Revised: 13 May 2010
Accepted manuscript online:
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PACS:
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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42.65.Wi
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(Nonlinear waveguides)
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42.81.Dp
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(Propagation, scattering, and losses; solitons)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60978007) and Open Fund of Key Laboratory of Optical Communication and Lightwave Technologies (Beijing University of Posts and Telecommunications), Ministry of Education, China. |
Cite this article:
Yang Ai-Ying(杨爱英) and Sun Yu-Nan(孙雨南) Comprehensive research on self phase modulation based optical delay systems 2010 Chin. Phys. B 19 114205
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