We examine the waveguide dimension and refractive-index difference space for the optimization of single-mode channel waveguide pigtails and optical fiber splices, and we explain these results using modal analysis. We present closed-form equations for the evaluation of the optimal index difference and the allowable variation in its value in any material. We provide a novel way of viewing common waveguide physical parameters and translating them into information that determines the efficacy of a fiber connection. (C) 1998 Optical Society of America. OCIS codes: 060.2430, 130.2790, 130.3120. [References: 9]
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