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AssigneeNippon Sheet Glass Co., Ltd.
InventorsKenjiro Hamanaka, Satoshi Taniguchi
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According to the present invention, there is provided a method of designing a collimator array device which enables reduction of the insertion loss because of the variation of the optical length. When the beam waist is positioned at the intermediate position between the emitting side planar microlens and the receiving side planar microlens (d1=L/2), the distance d0 between the emitting side fiber array and the emitting side planar microlens can be used as the distance between the receiving side fiber array and the receiving side planar microlens, and thereby the design of the collimator array device can be simplified. The distance d0 for satisfying d1=L/2 is calculated and two values d0-2 and d0-4 are obtained. By selecting the smaller value d0-2, it is possible to reduce the insertion loss because of the shift at the time of coupling.
A method of designing a collimator array device in which a laser beam, having a feature of a Gaussian beam, emitted from an emitting side fiber array is collimated by an emitting side lens, the collimated laser beam is made incident upon an optical functional element and thereafter converged by a receiving side lens, and the converged laser beam is made incident upon a receiving side fiber array, comprising the steps of:
A collimator array device in which the laser beam, having the feature of Gaussian beam, emitted from an emitting side fiber array is collimated by an emitting side lens, the collimated laser beam is made incident upon an optical functional element and thereafter converged by a receiving side lens, and the converged laser beam is made incident upon a receiving side fiber array, wherein the distance d0 between said emitting side fiber array and said emitting side lens is the smaller value of two values obtained based on a mean value La of the optical length L of the laser beam which passes from said emitting side lens through said receiving side lens.
Dependencies are inferred from the claim text.