Abstract

We demonstrate a method for reconstruction of the modal intensity distribution of light at the output of an optical fiber. Spatial modes of the optical fiber are separated in time as a result of differences in group velocity and are detected experimentally by observation of the interference of the modal field distribution with the time-gating reference field. The detected interference patterns of the modal fields are analyzed, providing the spatial impulse response of the fiber. We also use interferometric correlation to determine the spatiotemporal characteristics of the fiber modes, such as pulse width, linear chirp, and group velocity, for each mode.

© 2001 Optical Society of America

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References

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  1. S. Shaklan, Electron. Lett. 26, 24 (1990).
    [CrossRef]
  2. N. S. Kapany and J. J. Burke, Optical Waveguides (Academic, Orlando, Fla., 1972).
  3. F. Dubois, P. Emplit, and O. Hugon, Opt. Lett. 19, 7 (1994).
    [CrossRef]
  4. S. Shaklan, Appl. Opt. 30, 30 (1991).
    [CrossRef]
  5. F. Louradour and S. Shaklan, J. Opt. A 1, L7 (1999).
    [CrossRef]
  6. J.-C. Diels and W. Rudolph, Ultrafast Laser Pulse Phenomena (Academic, San Diego, Calif., 1996).
  7. P. C. Sun, Y. T. Mazurenko, and Y. Fainman, J. Opt. Soc. Am. A 14, 5 (1997).
    [CrossRef]

1999 (1)

F. Louradour and S. Shaklan, J. Opt. A 1, L7 (1999).
[CrossRef]

1997 (1)

P. C. Sun, Y. T. Mazurenko, and Y. Fainman, J. Opt. Soc. Am. A 14, 5 (1997).
[CrossRef]

1994 (1)

1991 (1)

S. Shaklan, Appl. Opt. 30, 30 (1991).
[CrossRef]

1990 (1)

S. Shaklan, Electron. Lett. 26, 24 (1990).
[CrossRef]

Burke, J. J.

N. S. Kapany and J. J. Burke, Optical Waveguides (Academic, Orlando, Fla., 1972).

Diels, J.-C.

J.-C. Diels and W. Rudolph, Ultrafast Laser Pulse Phenomena (Academic, San Diego, Calif., 1996).

Dubois, F.

Emplit, P.

Fainman, Y.

P. C. Sun, Y. T. Mazurenko, and Y. Fainman, J. Opt. Soc. Am. A 14, 5 (1997).
[CrossRef]

Hugon, O.

Kapany, N. S.

N. S. Kapany and J. J. Burke, Optical Waveguides (Academic, Orlando, Fla., 1972).

Louradour, F.

F. Louradour and S. Shaklan, J. Opt. A 1, L7 (1999).
[CrossRef]

Mazurenko, Y. T.

P. C. Sun, Y. T. Mazurenko, and Y. Fainman, J. Opt. Soc. Am. A 14, 5 (1997).
[CrossRef]

Rudolph, W.

J.-C. Diels and W. Rudolph, Ultrafast Laser Pulse Phenomena (Academic, San Diego, Calif., 1996).

Shaklan, S.

F. Louradour and S. Shaklan, J. Opt. A 1, L7 (1999).
[CrossRef]

S. Shaklan, Appl. Opt. 30, 30 (1991).
[CrossRef]

S. Shaklan, Electron. Lett. 26, 24 (1990).
[CrossRef]

Sun, P. C.

P. C. Sun, Y. T. Mazurenko, and Y. Fainman, J. Opt. Soc. Am. A 14, 5 (1997).
[CrossRef]

Appl. Opt. (1)

S. Shaklan, Appl. Opt. 30, 30 (1991).
[CrossRef]

Electron. Lett. (1)

S. Shaklan, Electron. Lett. 26, 24 (1990).
[CrossRef]

J. Opt. A (1)

F. Louradour and S. Shaklan, J. Opt. A 1, L7 (1999).
[CrossRef]

J. Opt. Soc. Am. A (1)

P. C. Sun, Y. T. Mazurenko, and Y. Fainman, J. Opt. Soc. Am. A 14, 5 (1997).
[CrossRef]

Opt. Lett. (1)

Other (2)

J.-C. Diels and W. Rudolph, Ultrafast Laser Pulse Phenomena (Academic, San Diego, Calif., 1996).

N. S. Kapany and J. J. Burke, Optical Waveguides (Academic, Orlando, Fla., 1972).

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Figures (4)

Fig. 1
Fig. 1

Propagation of an optical pulse in a multimode fiber. A single input pulse excites a set of spatial propagation modes of the fiber, which appear at the output at different times.

Fig. 2
Fig. 2

Experimental setup for interferometric cross-correlation measurements.

Fig. 3
Fig. 3

(a) Interference patterns, observed for two relative time delays, separated by Δτ6 ps. Two-dimensional spatial Fourier spectrum (b) before and (c) after filtering, showing dc and ac terms in each case in the center and on the sides, respectively. (d) Reconstructed modal intensity distributions corresponding to left, LP01 and right, LP11 modes.

Fig. 4
Fig. 4

Optical power at the fiber output for several time delays.

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