Abstract

This paper presents a tapered polymer waveguide structure for coupling light between optical waveguides with differing geometries. Optical fibers, lasers, and other photonic integrated circuit components can be coupled with tapered waveguides. The polymer waveguide performs a mode transformation between different mode shapes and sizes. For example, the mode transformation can be from an elliptical laser diode mode to that of a circular optical fiber mode. The input and output of a tapered waveguide structure are analyzed, for the case of laser to fiber coupling, in order to determine the effect of misalignments on the coupling efficiency. Adiabaticity in waveguide propagation is discussed. The fabrication of our polymer waveguides is also described.

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  1. C. Edwards, H. Presby, and C. Dragone, "Ideal microlenses for laser to fiber coupling," J. Lightwave Technol., vol. 11, pp. 252-257, Feb. 1993.
  2. H. Yanagawa, T. Shimizu, S. Nakamura, and I. Ohyama, "Index-and-dimensional taper and its application to photonic devices," J. Lightwave Technol., vol. 10, pp. 587-591, May 1992.
  3. N. Yamaguchi, Y. Kokubun, and K. Sato, "Low-loss spot-size transformer by dual tapered waveguides (DTW-SST)," J. Lightwave Technol., vol. 8, pp. 587-593, Apr. 1990.
  4. R. Zengerle, B. Jabobs, W. Weiershausen, K. Faltin, and A. Kunz, "Efficient spot-size transformation using spatially separated tapered InP/InGaAsP twin waveguides," J. Lightwave Technol., vol. 14, pp. 448-453, Mar. 1991.
  5. B. Mersali, H. Bruckner, M. Feuillade, S. Sainson, A. Ougazzaden, and A. Carenco, J. Lightwave Technol., vol. 13, pp. 1865-1871, Sept. 1995.
  6. G. Wenger, L. Stoll, B. Weiss, M. Schienle, R. Muller-Nawrath, S. Eichinger, J. Muller, B. Acklin, and G. Muller, "Design and fabrication of monolithic optical spot size transformers (MOST's) for highly efficient fiber-chip coupling," J. Lightwave Technol., vol. 12, pp. 1782-1790, Oct. 1994.
  7. R. Inaba, M. Kato, M. Sagawa, and H. Akahoshi, "Two-dimensional mode size transformation by \Deltan-controlled polymer waveguides," J. Lightwave Technol., vol. 16, pp. 620-624, Apr. 1998.
  8. C. Lee, M. Wu, L. Sheu, P. Fan, and J. Hsu, "Design and analysis of completely adiabatic tapered waveguides by conformal mapping," J. Lightwave Technol., vol. 15, pp. 403-410, Feb. 1993.
  9. J. Sakai and E. Marcatili, "Lossless dielectric tapers with three-dimensional geometry," J. Lightwave Technol., vol. 9, pp. 386-393, Mar. 1991.

J. Lightwave Technol. (9)

C. Edwards, H. Presby, and C. Dragone, "Ideal microlenses for laser to fiber coupling," J. Lightwave Technol., vol. 11, pp. 252-257, Feb. 1993.

H. Yanagawa, T. Shimizu, S. Nakamura, and I. Ohyama, "Index-and-dimensional taper and its application to photonic devices," J. Lightwave Technol., vol. 10, pp. 587-591, May 1992.

N. Yamaguchi, Y. Kokubun, and K. Sato, "Low-loss spot-size transformer by dual tapered waveguides (DTW-SST)," J. Lightwave Technol., vol. 8, pp. 587-593, Apr. 1990.

R. Zengerle, B. Jabobs, W. Weiershausen, K. Faltin, and A. Kunz, "Efficient spot-size transformation using spatially separated tapered InP/InGaAsP twin waveguides," J. Lightwave Technol., vol. 14, pp. 448-453, Mar. 1991.

B. Mersali, H. Bruckner, M. Feuillade, S. Sainson, A. Ougazzaden, and A. Carenco, J. Lightwave Technol., vol. 13, pp. 1865-1871, Sept. 1995.

G. Wenger, L. Stoll, B. Weiss, M. Schienle, R. Muller-Nawrath, S. Eichinger, J. Muller, B. Acklin, and G. Muller, "Design and fabrication of monolithic optical spot size transformers (MOST's) for highly efficient fiber-chip coupling," J. Lightwave Technol., vol. 12, pp. 1782-1790, Oct. 1994.

R. Inaba, M. Kato, M. Sagawa, and H. Akahoshi, "Two-dimensional mode size transformation by \Deltan-controlled polymer waveguides," J. Lightwave Technol., vol. 16, pp. 620-624, Apr. 1998.

C. Lee, M. Wu, L. Sheu, P. Fan, and J. Hsu, "Design and analysis of completely adiabatic tapered waveguides by conformal mapping," J. Lightwave Technol., vol. 15, pp. 403-410, Feb. 1993.

J. Sakai and E. Marcatili, "Lossless dielectric tapers with three-dimensional geometry," J. Lightwave Technol., vol. 9, pp. 386-393, Mar. 1991.

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