Abstract

We show that the active nonlinear coupler laser proposed by us can produce picosecond pulse trains in dual-core fiber lasers with positive group-velocity dispersion. These pulses are accurately described by a linearly chirped soliton profile. The linear chirp should make it possible to obtain subpicosecond pulses widths through extracavity chirp compensation.

© 1993 Optical Society of America

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References

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  1. H. G. Winful, D. T. Walton, Opt. Lett. 17, 1688 (1992).
    [CrossRef] [PubMed]
  2. I. Duling, Opt. Lett. 16, 539 (1991).
    [CrossRef]
  3. M. Hofer, M. E. Fermann, F. Haberl, M. H. Ober, A. J. Schmidt, Opt. Lett. 16, 502 (1991).
    [CrossRef] [PubMed]
  4. P. A. Bélanger, L. Gagnon, C. Paré, Opt. Lett. 14, 943 (1989).
    [CrossRef] [PubMed]
  5. L. Allen, J. H. Eberly, Optical Resonance in Two Level Atoms (Wiley Interscience, New York, 1975), p. 102.

1992 (1)

1991 (2)

1989 (1)

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Figures (4)

Fig. 1
Fig. 1

Schematic of the ANCL. The shaded core is doped with neodymium.

Fig. 2
Fig. 2

Transmission of neodymium-doped, half-beat-length fiber coupler. Solid curve, active core; dashed–dotted curve, passive core.

Fig. 3
Fig. 3

Evolution of a pulse with initial amplitude u0 = 2 launched into the active core. Shown here are 10 round trips. (a) |u|2, the intensity in the active core. (b) |v|2, the intensity in the passive core.

Fig. 4
Fig. 4

Comparison of analytically calculated pulse (solid curve) to numerically calculated pulse (dashed–dotted curve). The frequency chirp of the pulses is overlaid (dotted curve).

Equations (9)

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i u ξ - 1 2 2 u τ 2 + κ v + u 2 u = i 1 2 g L D ( u + τ 2 2 2 u τ 2 ) ,
i v ξ - 1 2 2 v τ 2 + κ u + v 2 v = 0.
i u ξ - 1 2 2 u τ 2 + u 2 u = i 1 2 g L D ( u + τ 2 2 2 u τ 2 ) .
u ( ξ , τ ) = u 0 sech ( α τ ) exp { i [ Γ ξ + β ln cosh ( α τ ) ] } ,
β 2 - 3 D β - 2 = 0 ,
α 2 T 2 2 ( β 2 + 1 ) = 3 ,
β 2 + 3 β / D = 2 ( 1 - N ) ,
N = - n 2 k 0 u 0 2 2 β 2 α 2 ,
d ϕ d τ = β α tanh ( α τ ) ,

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