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Single Mode Optical Source-Fiber Coupling

IP.com Disclosure Number: IPCOM000044878D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Townsend, VT: AUTHOR

Abstract

An optical lens combination is described to match the mode of the coherent output from an injection laser to a single mode optical fiber without introducing aberrations which destroy coherence and efficiency. The figure shows three-lens elements between the output face of the injection laser 1 and the input face 5 of the optical fiber 6. The first element 2 nearest the injection laser is a cylindrical optical fiber whose axis is oriented parallel with the plane of the P-N junction in the injection laser 1. The middle optical element 3 is a second optical fiber whose axis is oriented vertically with respect to the plane of the junction of the injection laser 1. The third optical element nearest the input face 5 of the optical fiber 6 is a spherical lens 4.

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Single Mode Optical Source-Fiber Coupling

An optical lens combination is described to match the mode of the coherent output from an injection laser to a single mode optical fiber without introducing aberrations which destroy coherence and efficiency. The figure shows three-lens elements between the output face of the injection laser 1 and the input face 5 of the optical fiber 6. The first element 2 nearest the injection laser is a cylindrical optical fiber whose axis is oriented parallel with the plane of the P-N junction in the injection laser 1. The middle optical element 3 is a second optical fiber whose axis is oriented vertically with respect to the plane of the junction of the injection laser 1. The third optical element nearest the input face 5 of the optical fiber 6 is a spherical lens 4. The combination of the injection laser 1 and crossed-optical fibers 2 and 3 produces a spherically symmetric coherent, single- mode optical beam with a nearly zero wavefront curvature. This light wavefront then, passes through the microsphere 4, producing an optical beam with coherent illumination at the entrance face 5 of the single mode optical fiber 6. This lens coupling arrangement provides a maximum transfer of optical power from the injection laser 1 to the optical fiber 6 and enables the assembly to be mechanically coupled to the optical fiber for good packaging characteristics.

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