Effect of pulse walk-off on femtosecond pulse compression in photonic crystal fibers

ZHAO Rong-xia; LI Ai-ping

doi:10.3969/j.issn.1001-3806.2011.05.009

In order to study the influence of pulse walk-off on femtosecond signal pulse compression in photonic crystal fibers, the coupled nonlinear Schrdinger equations were numerically solved by means of standard split-step Fourier method. The nonlinear propagation of two femtosecond optical pulses in a photonic crystal fiber was simulated. The effect of pulse walk-off and asynchronous coupling on signal pulse compression was simulated and analyzed. It is found that the signal pulse can be compressed through the cooperation by group velocity dispersion, third-order dispersion, self-phase modulation and cross-phase modulation, when the pump pulse is input in the anomalous dispersion region while the signal pulse is input in the normal dispersion region. Pulse walk-off not only leads to the degradation of the compression ratio of the signal pulse but also leads to a longer fiber length at which the width of the compressed signal pulse is the minimum, and leads to the non-symmetry of the compressed signal pulse. It is also found that the quality factor of the signal pulse will be improved with the asynchronous coupling method.

Effect of pulse walk-off on femtosecond pulse compression in photonic crystal fibers

1. Department of Physics, Binzhou University, Binzhou 25663, China;

2. Institute for Theoretical Physics, Binzhou University, Binzhou 256603, China

Received Date: 2010-12-03

Accepted Date: 2010-12-16

Available Online: 2011-09-25

Abstract: In order to study the influence of pulse walk-off on femtosecond signal pulse compression in photonic crystal fibers, the coupled nonlinear Schrdinger equations were numerically solved by means of standard split-step Fourier method. The nonlinear propagation of two femtosecond optical pulses in a photonic crystal fiber was simulated. The effect of pulse walk-off and asynchronous coupling on signal pulse compression was simulated and analyzed. It is found that the signal pulse can be compressed through the cooperation by group velocity dispersion, third-order dispersion, self-phase modulation and cross-phase modulation, when the pump pulse is input in the anomalous dispersion region while the signal pulse is input in the normal dispersion region. Pulse walk-off not only leads to the degradation of the compression ratio of the signal pulse but also leads to a longer fiber length at which the width of the compressed signal pulse is the minimum, and leads to the non-symmetry of the compressed signal pulse. It is also found that the quality factor of the signal pulse will be improved with the asynchronous coupling method.

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Reference (16)

[1]	KNIGHT J C,BIRKS T A,RUSSEL P St J,et al.All-silica single-mode optical fiber with photonic crystal cladding[J].Optics Letters,1996,21(19):1547-1549.
[2]	BIRKS T A,KNIGHT J C,RUSSEL P St J,et al.Endlessly single-mode photonic crystal fiber[J].Optics Letters,1997,22(13):961-963.
[3]	WANG Q Y,HU M L,CHAI L.Progress in nonlinear optics with photonic crystal fibers[J].Chinese Journal of Lasers,2006,33(1):57-66(in Chinese).
[4]	WELCH M G,COOK K,CORREA R A,et al.Solitons in hollow core photonic crystal fiber:engineering nonlinearity and compressing pulses[J].Journal of Lightwave Technology,2009,27(11):1644-1652.
[5]	WASHBURN B R,RALPH S E,WINDELER R S.Ultrashort pulse propagation in air-silica microstructure fiber[J].Optics Express,2002,10(13):575-580.
[6]	GAETA A L.Nonlinear propagation and continuum generation in microstuctured optical fibers[J].Optics Letters,2002,27(11):924-926.
[7]	WANG R X,DOU Ch Sh,YUE X Ch.Numerical study on a femtosecond laser pulse in photonic crystal fiber[J].Laser Technology,2006,30(5):555-557(in Chinese).
[8]	CHENG Ch F,WANG X F,FANG Z,et al.Nonlinear copropagation of two optical pulses of different frequencies in photonic crystal fibers[J].Applied Physics,2005,B80(3):291-294.
[9]	AGRAWAL G P,BALDECK P L,ALFANO R R.Temporal and spectral effects of cross-phase modulation on copropagating ultrashort pulses in optical fibers[J].Physical Review,1989,A40(9):5063-5072.
[10]	GENTY G,LEHTONEN M,LUDVIGSEN H.Effect of cross-phase modulation on supercontinuum generated in microstructured fibers with sub-30fs pulses[J].Optics Express,2004,12(19):4614-4624.
[11]	CAO W H,ZHANG Y W.Effect of pulse walk off on optical pulse compression based on cross-phase modulation in single-mode fibers[J].Acta Optica Sinica,1996,16(12):1737-1744(in Chinese).
[12]	ZHANG Sh M,LUO A P,XU W Ch.Higher-order soliton compression due to cross-phase modulation in optical fibers[J].Journal of Optoelectronics·Laser,2003,14(8):877-880(in Chinese).
[13]	LUO A P,XU W Ch,CHEN W Ch,et al.Soliton pulse compression based on cross-phase modulation in anomalous dispersive optical fiber[J].Chinese Journal of Lasers,2001,28(5):421-425(in Chinese).
[14]	DONG L L,YANG X Y.Effect of high-order dispersion and nonlinear on compression pulse pair in PCF[J].Laser & Infrared,2008,38(8):792-795(in Chinese).
[15]	CAO W H,LIU S H.Enhanced soliton-effect pulse compression by cross-phase modulation in optical fibers[J].Science in China,2000,43(6):595-605.
[16]	AGRAWAL G P.Nonlinear fiber optics & applications of nonlinear fiber optics[M].3rd ed.Beijing:Publishing House of Electronics Industry,2002:172-181(in Chinese).

Effect of pulse walk-off on femtosecond pulse compression in photonic crystal fibers

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