Abstract

By means of a delayed pulsed method, we carry out an experimental study of the mutual spectral coherence of supercontinuum trains generated through a tapered fiber. We observe a strong dependence of the spectral coherence on the input wavelength. Analysis of the interferograms shows that this is related to the robustness of different order soliton fission processes. A broadband continuum with 20dB wavelength from 500nm~1300nm with high coherence (mean visibility g12~0.7) is obtained.

© 2004 Optical Society of America

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References

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J. Opt. Soc. Am. B

Opt. Commun.

A.J.C. Grellier, N.K. Zayer and C.N. Pannell, �??Heat transfer modelling in CO2 laser processing of optical fibres,�?? Opt. Commun. 152, 324-328 (1998)
[CrossRef]

Opt. Express

Opt. Lett.

Phys. Rev. Lett.

A.V.Husakou and J. Herrmann, �??Supercontinuum Generation of Higher-Order Solitons by Fission in Photonic Crystal Fibers,�?? Phys. Rev. Lett. 87, 203901 (2001)
[CrossRef] [PubMed]

S. A. Diddams, D. J. Jones, J. Ye, T. Cundiff, J. L. Hall, J. K. Ranka, R. S. Windeler, R. Holzwarth, T. Udem, and T. W. Hansch, �??Direct link between microwave and optical frequencies with a 300 THz femtosecond laser comb,�?? Phys. Rev. Lett. 84, 5102-5105 (2000).
[CrossRef] [PubMed]

K.L. Corwin, N.R. Newbury, J.M. Dudley, S.C oen, S.A. Diddams, K. Webber, and R.S. Windeler, �??Fundamental noise limitations to supercontinuum generation in microstructure fiber,�?? Phys. Rev. Lett. 90, 113904-1(2003)
[CrossRef]

Science

D.V. Skryabin, F. Luan, J. C. Knight, and P. St. J. Russell, �??Soliton Self-Frequency Shift Cancellation in Photonic Crystal Fibers,�?? Science, 301, 1705-1708 (2003)
[CrossRef] [PubMed]

Other

G.P. Agrawal, Nonlinear fiber Optics, 3rd edition, (2001, Academic Press).

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Figures (5)

Fig. 1.(a)
Fig. 1.(a)

Setup for measuring mutual spectral coherence of adjacent continuum pulses. BS: broadband beam splitter, ISO: isolator, M (1–4): ER.2 mirrors

Fig. 1.(b)
Fig. 1.(b)

SC interference fringes between 840nm and 875nm generated by 820nm input pulses at 112mw

Fig. 2.
Fig. 2.

SC spectrum for different input wavelengths at a constant 112mw input power.

Fig. 3.
Fig. 3.

Coherence comparison for different spectrum windows of the SC generated separately by input wavelengths of 860nm (left column: (a)~(d) figures) and 920nm (right column: (e)~(f) figures)

Fig. 4.
Fig. 4.

Fringe visibility vs. input wavelengths. Green, red, black and blue curves represent the coherence of SC generated by input wavelength of 780nm, 820nm, 860nm and 920nm respectively. Light blue line represents the group velocity dispersion (GVD) curve of the taper fiber and GVD goes to zero around 820 nm.

Equations (3)

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g 12 ( λ , t 1 t 2 ) = E 1 * ( λ , t 1 ) E 2 ( λ , t 2 ) [ E 1 ( λ , t 1 ) 2 E 2 ( λ , t 2 ) 2 ] 1 2 ,
Ω c 2 = 4 γ P 0 β 2
N 2 = γ P 0 T 0 2 β 2 ,

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