Profile: Princetel, Inc. is a manufacturer of fiber optic inter-connect products. Our main product lines are fiber optic rotary joints/electrical slip rings, active/passive fiber optic components, and fiber polishing machines. Our fiber optic rotary joints are key coupling devices in winches, robotic vehicles, wind turbines, medical OCT systems, satellite antennae, high-definition broadcasting systems, and submarines. Our high performance hybrid electrical/optical slip rings are also offered as integrated solutions. Our diode laser fiber coupling transforms divergent non-circular beams into flexible guided beams. Our passive components such as the standard fiber collimators can produce output beam diameters from 70 um to 15 mm in single mode fibers. Our portable polishing machines come with either a unique hand crank and an indispensable safety feature to eliminate fire hazards in oil and gas operations.