4 October 2005 Intrinsic properties of the optical coupling phenomenon: an experimental investigation using single-mode device and fiber
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High-speed transmission optical devices often use a single-mode fiber as receiver. The fiber must be accurately aligned over five degrees of freedom with respect to an optical field. In previous works, it has been demonstrated that the optical coupling between axisymmetric Gaussian beams has distinctive parabolic, hyperbolic, and linear like characteristics that may be advantageously used to design automated alignment strategies. These properties were proven to exist experimentally when two single-mode fibers are used as receiver and emitter. This paper presents an experimental investigation of these properties for a practical optical coupling situation: the alignment of a receiving single-mode fiber with an optical device. For the purpose of this investigation, the optical device is comprised of an emitting fiber and two lenses mounted in series in order to form a converging optical field at the output of the second lense. A five axis nanopositionning system is used to move the receiving fiber relatively to the device. Even though optical fields are not exactly Gaussian, experiments demonstrate the existence of the properties within a practical range of interest for single-mode device-to-fiber alignment automation. These properties of the coupled optical power provide a strong basis to develop model-based algorithms for axisymmetric single-mode device-to-fiber alignment automation.
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Yves St-Amant, Yves St-Amant, "Intrinsic properties of the optical coupling phenomenon: an experimental investigation using single-mode device and fiber", Proc. SPIE 5970, Photonic Applications in Devices and Communication Systems, 597003 (4 October 2005); doi: 10.1117/12.628714; https://doi.org/10.1117/12.628714


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