We report on a novel fused collimator design as part of a transmitter optical sub-assembly (TOSA) used for agile microwave photonic links. The fused collimator consists of a PM fiber that is laser fused to a C type lens. The fusion joint provides a low loss interface between the two components and eliminates the need for separate components in the optical path. The design simplifies the number of components with the optical assembly leading to several advantages over traditional designs. In this paper we use the fiber coupling efficiency as a design metric and discuss the optmechanical tolerances and its effect on the overall design parameters.
A unique technology for the fabrication of high-quality and robust beam delivery optics for fiber lasers is presented.
CO2 lasers are used to reshape the spherical surface of plano-convex fused-silica rod-lenses, and then fuse the optical
fiber directly to these lenses. A specific fiber collimating system is presented and analyzed in terms of aberrations,
insertion loss, M2, and return loss. Test results are compared to the theoretical modeling, demonstrating the accuracy
and repeatability of this technology.
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