Abstract

Efficient spot-size convertors are an essential component of modern integrated optoelectronics, providing a simple and reliable interface with fibers. One recently proposed design functions by forcing the field from a small spot rib waveguide into a large spot one by using a taper. Accurate models of these structures, and a clear understanding of the coupling mechanisms they rely upon, are essential if optimized designs are to be produced. Furthermore, it is necessary to develop analysis techniques which are accurate yet not computationally intensive, suitable for use within an iterative design environment. Here, the well known and proven spectral index method is extended to efficiently analyze this class of vertically coupled rib waveguide spot-size transformer, providing both the guided modes and for the first time, the substrate radiation modes of the structure. These modes can then subsequently be used to design and determine the performance of the full tapered structure.

[IEEE ]

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  1. M. Boumedienne, H. J. Bruckner, M. Feuillade, S. Sainson, A. Ougazzaden, and A. Carenco, "Theoretical and experimental studies of a spot-size transformer with integrated waveguide for polarization insensitive optical amplifiers," J. Lightwave Technol., vol. 13, pp. 1865-1871, Sept. 1995.
  2. 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.
  3. J. Buus, W. J. Stewart, J. Haes, J. Willems, and R. G. Baets, "Spot size expansion for laser-to-fiber coupling using an integrated multimode coupler," J. Lightwave Technol., vol. 11, pp. 582-588, Apr. 1993.
  4. J. R. Pujol Pola, W. Biehlig, and F. Lederer, "A generalization of the spectral index method toward multiple rib waveguides," J. Lightwave Technol., vol. 14, pp. 454-461, Mar. 1996.

J. Lightwave Technol. (4)

M. Boumedienne, H. J. Bruckner, M. Feuillade, S. Sainson, A. Ougazzaden, and A. Carenco, "Theoretical and experimental studies of a spot-size transformer with integrated waveguide for polarization insensitive optical amplifiers," 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.

J. Buus, W. J. Stewart, J. Haes, J. Willems, and R. G. Baets, "Spot size expansion for laser-to-fiber coupling using an integrated multimode coupler," J. Lightwave Technol., vol. 11, pp. 582-588, Apr. 1993.

J. R. Pujol Pola, W. Biehlig, and F. Lederer, "A generalization of the spectral index method toward multiple rib waveguides," J. Lightwave Technol., vol. 14, pp. 454-461, Mar. 1996.

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