Low-cost and compact fiber-to-laser coupling with micro-Fresnel lens

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Abstract
A novel laser coupling module composed of a 1.3 micrometers single-mode fiber and a small laser package ((phi) equals 5.6 mm) which builds in a single thin microlens and a 0.78 micrometers emitting laser diode is proposed. A micro Fresnel lens with a high numerical aperture (0.45) and short focal length (0.65 mm) has been utilized for the first time as a laser-to-fiber coupling lens. The proposed laser coupling module measures about 2.8 mm between a laser facet and a fiber edge. The coupling efficiency of 23 in experiment is shown to be adequate for short- haul transmissions and fiber-to-the-home applications. Because all of the elements that compose the present module are able to be obtained at low prices, the design could reduce the cost of laser modules.

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