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Chin. Phys. B, 2009, Vol. 18(12): 5375    DOI: 10.1088/1674-1056/18/12/043
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Optimization control of modulation-instability gain in photonic crystal fibres with two-zero dispersion wavelengths

Wang He-Lin, Leng Yu-Xin, Xu Zhi-Zhan
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract  We design three kinds of photonic crystal fibres (PCF) with two zero-dispersion wavelengths (ZDWs) using the improved full vector index method (FVIM) and finite-difference frequency domain (FDFD) techniques. Based on these designed fibres, the effect of fibre structure, pump power and wavelength on the modulation instability (MI) gain in the anomalous dispersion region close to the second ZDW of the PCFs is comprehensively analysed in this paper. The analytical results show that an optimal MI gain can be obtained when the optimal pump wavelength (1530~nm) is slightly shorter than the second ZDW (1538~nm) and the optimal pump power is 250~W. Importantly, the total MI gain bandwidth has been increased to 260~nm for the first time, so far as we know, for an optimally-designed fibre with Λ = 1.4~nm and d/Λ = 0.676, and the gain profile became much smoother. The optimal pump wavelength relies on the second ZDW of the PCF whereas the optimal pump power depends on the corporate operation of the optimal fibre structure and optimal pump wavelength, which is important in designing the most appropriate PCF to attain higher broadband and gain amplification.
Keywords:  modulation instability gain      broadband amplification      optimization control  
Received:  04 January 2009      Revised:  07 May 2009      Published:  20 December 2009
PACS:  42.70.Qs (Photonic bandgap materials)  
  42.65.Hw (Phase conjugation; photorefractive and Kerr effects)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  42.81.-i (Fiber optics)  
Fund: Project supported by the National Key Basic Research Program of China (Grant No 2006CB806001), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No KGCX-YW-417-2), and Shanghai Commission of Science and Technology, China (Grant No

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Wang He-Lin, Leng Yu-Xin, Xu Zhi-Zhan Optimization control of modulation-instability gain in photonic crystal fibres with two-zero dispersion wavelengths 2009 Chin. Phys. B 18 5375

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