Abstract

We study the beam quality at the output of a multimode step-index optical fiber with a small number of modes following injection from a single-mode input fiber. It is shown that the output beam quality is optimized when the injecting fiber is offset from the center of the receiving core. Theoretical results demonstrating this phenomenon are in good agreement with an experimental demonstration. These results may have practical consequences in beam-coupling schemes and in applications emphasizing the importance of beam quality.

© 2009 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]

2007

S. Wielandy, Opt. Express 15, 15402 (2007).
[CrossRef] [PubMed]

N. Jinfu, X. Jianqiu, Opt. Commun. 274, 315 (2007).
[CrossRef]

2006

1999

K. Okada, M. Tateda, T. Omatsu, A. Hasegawa, Opt. Rev. 6, 3301999.
[CrossRef]

1993

P. A. Belanger, Opt. Eng. 32, 2107 (1993).
[CrossRef]

1975

1971

Belanger, P. A.

P. A. Belanger, Opt. Eng. 32, 2107 (1993).
[CrossRef]

Bingchu, C.

D. Xuhan, Z. Xiaolin, C. Bingchu, in Conference Digest of 2002 IEEE/LEOS International Conference on Optical MEMS (IEEE, 2002).

Dietrich, M.

M. Dietrich, Theory of Dielectric Optical Waveguides, 2nd ed. (Academic, 1991).

Ghatak, A.

A. Ghatak, Introduction to Optical Fibers (Cambridge U. Press, 1998).

Gloge, D.

Hasegawa, A.

K. Okada, M. Tateda, T. Omatsu, A. Hasegawa, Opt. Rev. 6, 3301999.
[CrossRef]

Hidehiko, Y.

Jianqiu, X.

N. Jinfu, X. Jianqiu, Opt. Commun. 274, 315 (2007).
[CrossRef]

Jinfu, N.

N. Jinfu, X. Jianqiu, Opt. Commun. 274, 315 (2007).
[CrossRef]

Love, J.

A. Snyder, J. Love, Optical Waveguide Analysis (Kluwer Academic, 2000).

Masaaki, I.

Masud, M.

Okada, K.

K. Okada, M. Tateda, T. Omatsu, A. Hasegawa, Opt. Rev. 6, 3301999.
[CrossRef]

Okamoto, K.

K. Okamoto, Fundamentals of Optical Waveguides (Academic, 2006).

Okoshi, T.

T. Okoshi, Optical Fibers (Academic, 1982).

Omatsu, T.

K. Okada, M. Tateda, T. Omatsu, A. Hasegawa, Opt. Rev. 6, 3301999.
[CrossRef]

Pavel, P.

Siegman, A. E.

A. E. Siegman, in OSA Annual Meeting (Optical Society of America, 1998).

Snyder, A.

A. Snyder, J. Love, Optical Waveguide Analysis (Kluwer Academic, 2000).

Tateda, M.

K. Okada, M. Tateda, T. Omatsu, A. Hasegawa, Opt. Rev. 6, 3301999.
[CrossRef]

Wielandy, S.

Xiaolin, Z.

D. Xuhan, Z. Xiaolin, C. Bingchu, in Conference Digest of 2002 IEEE/LEOS International Conference on Optical MEMS (IEEE, 2002).

Xuhan, D.

D. Xuhan, Z. Xiaolin, C. Bingchu, in Conference Digest of 2002 IEEE/LEOS International Conference on Optical MEMS (IEEE, 2002).

Appl. Opt.

J. Lightwave Technol.

Opt. Commun.

N. Jinfu, X. Jianqiu, Opt. Commun. 274, 315 (2007).
[CrossRef]

Opt. Eng.

P. A. Belanger, Opt. Eng. 32, 2107 (1993).
[CrossRef]

Opt. Express

Opt. Rev.

K. Okada, M. Tateda, T. Omatsu, A. Hasegawa, Opt. Rev. 6, 3301999.
[CrossRef]

Other

A. Ghatak, Introduction to Optical Fibers (Cambridge U. Press, 1998).

D. Xuhan, Z. Xiaolin, C. Bingchu, in Conference Digest of 2002 IEEE/LEOS International Conference on Optical MEMS (IEEE, 2002).

A. E. Siegman, in OSA Annual Meeting (Optical Society of America, 1998).

M. Dietrich, Theory of Dielectric Optical Waveguides, 2nd ed. (Academic, 1991).

T. Okoshi, Optical Fibers (Academic, 1982).

A. Snyder, J. Love, Optical Waveguide Analysis (Kluwer Academic, 2000).

K. Okamoto, Fundamentals of Optical Waveguides (Academic, 2006).

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Figures (2)

Fig. 1
Fig. 1

Experimental setup. FB-LR, laser; F in , input fiber; d, offset displacement; TR, translator, F out , output fiber; L 1 , collimating lens; PM, power meter; L 2 , imaging lens; CCD, camera.

Fig. 2
Fig. 2

(a) Power transfer efficiency versus distance between fiber centers. Theoretical curve (thick solid); measured curve (dashed). Thin curves show excitation of the individual modes (theory). (b) M 2 values of 30 m MM fiber. Theoretical (solid) and measured (dashed) curves.

Tables (1)

Tables Icon

Table 1 Fiber Parameters ( 13.5 m 0.13 NA ), As Calculated, Utilizing the Characteristic Fiber Equation [10]

Equations (4)

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E n , m ( r , θ ) = J n ( u n , m a r ) J n ( u n , m ) cos ( n θ ) r a K n ( w n , m a r ) K n ( w n , m ) cos ( n θ ) r > a ,
η ( n , m , x ) = ψ in ( x x , y ) ψ n , m out * ( x , y ) d x d y 2 ,
BPP total ( x ) = n , m = 1 max η n , m ( x )     BPP n , m n , m = 1 max η n , m ( x ) ,
M 2 = BPP actual π 4 λ ,

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