| Popis: |
The work is devoted to the problem of the integration of the photonic integrated circuit with optical fiber. In the standard single mode fibers mode field diameter is greater than the mode field diameter in the waveguide in 3–10 times, so coupling of light has high losses. It was considered lateral coupling between lensed tapered fiber and a small diameter waveguide. It was performed an analytical calculation with the gaussian approximation and modelling of fiber tapered lens for input radiation into the waveguide using the method of propagating beam. As a result, the analytical calculation and simulation derived an optimum radius of curvature of the tapered lens for an effective input of optical radiation in an arbitrary waveguide with a diameter of 3 microns. Lensed tapered fibers were made up by chemical etching followed by arc melting technology and it was received a set of samples with a radius of curvature from 6 to 16 microns. Mode field diameter of samples was measured by the transverse offset technique in the near field, and the focal length was measured by the method of the Fabry-Perot interferometer. The error of measured parameters is no more than 30%, and results are confirmed with analytical calculation and modeling.Received 07.03.2017; accepted 11.05.2017 |
