Abstract

Two approaches, i.e., a diffraction model considering Fresnel reflection and a paraxial beam propagation method are utilized to optimize the design of wedge-shaped lensed fibers for coupling between laser diodes of highly asymmetrical beam and single-mode fibers. It is demonstrated for the first time that, in contrast to the prevailing view, the non-Gaussian fiber-mode shape modification by the wedged fiber tip greatly reduces the coupling efficiency when the wedge angle is relatively large, while the Fresnel reflection is found to play an insignificant role. The fundamental cause of the non-Gaussian shape effect is fully explored and,consequently, a novel design is proposed to suppress this effect and increase coupling efficiency. Moreover, the novel design is relatively simple, and it does not complicate fiber tip fabrication process.

© 2003 IEEE

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J. Lightwave Technol.

Other

W. P. Huang and C. L. Xu, "Simulation of three-dimensional optical waveguides by a full-vector beam propagation method", IEEE J. Quantum Electron., vol. 29, pp. 2639 -2649, Oct. 1993.

B. Hermansson, D. Yevick and J. Saijonmaa, "Propagating-beam-method analysis of two-dimensional microlenses and three-dimensional taper structures", J. Opt. Soc. Amer. A, vol. 1, pp. 663-671, 1984.

D. Marcuse, "Loss analysis of single-mode fiber splices", Bell Syst. Tech. J., vol. 56, pp. 703-718, 1977.

Y. Irie, J. Miyokawa, A. Mugino and T. Shimizu, "Over 200 mw 980 nm pump laser diode module using optimized high-coupling lensed fiber", in Tech. Dig. OFC/IOOC'99, San Diego, CA, Feb. 1999, pp. 238- 240.

J. C. Livas, S. R. Chinn, E. S. Kintzer, J. N. Walpole, C. A. Wang and L. J. Missaggia, "High-power erbium-doped fiber amplifier with 975 nm tapered-gain-region laser pumps", Electron. Lett., vol. 30, pp. 1054-1055, 1994.

V. S. Shah, L. Curtis, R. S. Vodhanel, D. P. Bour and W. C. Young, "Efficient power coupling from a 980 nm, broad-area laser to a single-mode fiber using a wedge-shaped fiber endface", J. Lightwave Technol. , vol. 8, pp. 1313-1318, Sept. 1990.

R. A. Modavis and T. W. Webb, "Anamorphic microlens for laser diode to single-mode fiber coupling", IEEE. Photon. Technol. Lett., vol. 7, pp. 798-800, July 1995.

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