Two lens optical package and method of making same

Details Two lens optical package and method of making same Two lens optical package and method of making same

1985-11-26

1987-11-10

Lee, John

350 9620, 350416, 350320, G02B 632

Patent

active

047053518

ABSTRACT:
An optical package includes a first lens assembly and a second lens assembly aligned such that their optical axes are common. The first lens assembly comprises a divergent light source disposed along the optical axis of a first lens such that the object distance is less than the focal length of the first lens. The second lens assembly comprises a body, having a light acceptance angle less than the angle of divergence of the light source, disposed along the optical axis of a second lens such that the object distance is greater than the focal length of the second lens. The assemblies are disposed such that the images formed by each assembly alone correspond in position along the common axis thereby coupling the light from the source into the body.
The package is fabricated by placing the source within the focal length of the first lens and the body is placed outside the focal length of the second lens, forming first and second lens assemblies, respectively. The assemblies are placed along a common axis such that a virtual image of the source, which would be formed by the first assembly alone, and a real image of the body, which would be formed by the second assembly alone, are aligned along the common axis.

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Kenji Kawano et al., "Laser Diode Module for Single-Mode Fiber Using Modified Confocal Two Lens Method with Divided Second Lens" (Translation provided), pp. 2-76, Nat'l. Convention of Opt. & R.W. Section of Electron. Commun. Society of Japan, 1984.
Kenji Kawano et al., "Proposal of New Combination Lens Methods for Laser Diode Module Using Single-Mode Fibers", pp. 17-24, (Translation provided), OQE 84-85.
M. Saruwatari et al., "Efficient Laser Diode to Single-Mode Fiber Coupling Using a Combination of Two Lenses in Confocal Condition", Jour. of Quantum Elect., vol. QE-17, No. 6, Jun. 1981, pp. 1021-1027.
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