To guide an optical signal into an integrated optical circuit, small optical paths, which have a diameter about 2 μm, must be used. Conventional fibers are larger in size - about 10μm. Therefore we need a tapered structure to connect these types of optical paths. We found that transmission efficiency of taper depending on the parameters as length, curvature on either side, upper curve, etc... In this report, we focus only on the influence of the lateral curvature on the taper transmission coefficient.