Abstract

An efficient LP01 to LP11 modal coupler using periodic microbends, spaced by a beat length between the modes, was built and tested. The optical-wavelength dependence of the device is investigated, as are the polarization characteristics and the LP mode approximation. Finally, the loss of the modal coupler was measured as a function of wavelength.

© 1986 Optical Society of America

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References

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  1. R. C. Youngquist, J. L. Brooks, H. J. Shaw, Opt. Lett. 8, 656 (1983).
    [CrossRef] [PubMed]
  2. R. C. Youngquist, J. L. Brooks, H. J. Shaw, Opt. Lett. 9, 177 (1984).
    [CrossRef] [PubMed]
  3. H. F. Taylor, J. Lightwave Technol. LT-2, 617 (1984).
    [CrossRef]
  4. D. Gloge, Appl. Opt. 10, 2252 (1971).
    [CrossRef] [PubMed]

1984 (2)

1983 (1)

1971 (1)

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Figures (5)

Fig. 1
Fig. 1

Dependence of the normalized beat length between the two lowest-order modes in a step-index fiber on the normalized frequency.

Fig. 2
Fig. 2

Fiber subject to periodic microbending.

Fig. 3
Fig. 3

(a) Experimental setup for measuring the beat length between the LP01 and LP11 modes and for determining the coupling efficiency between the two modes. (b) Experimental setup for viewing the polarization and mode properties of the modal coupler. DMF, double-moded fiber; MS, LP11 mode stripper; MC, modal coupler; PC, polarization controller.

Fig. 4
Fig. 4

Spatial orientation of the LP11 modes generated from orthogonal polarizations of the LP01 mode passing through a periodic microbending structure.

Fig. 5
Fig. 5

Measured insertion loss of the modal coupler as a function of wavelength.

Equations (8)

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L B = 2 π / Δ β ,
L B = 2 π a ( 2 Δ ) 1 / 2 f ( V ) ,
Δ = ( n c - n cl ) n c ( n c - n cl ) n cl
[ u i v i ] = [ 1 - K 2 j K j K e j θ 1 - K 2 e j θ ] [ u i - 1 v i - 1 ] .
[ u n v n ] = [ 1 - K 2 j K j K e j θ 1 - K 2 e j θ ] n [ u 0 v 0 ] .
v n 2 = K 2 Z 2 sin 2 ( n sin - 1 Z ) ,
Z = ( K 2 cos 2 θ 2 + sin 2 θ 2 ) 1 / 2 .
v n 2 = sin 2 ( n sin - 1 K ) .

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