Multimode fiber-lens optical coupler

Details Multimode fiber-lens optical coupler Multimode fiber-lens optical coupler

1985-01-15

1987-10-20

Lee, John

350 9616, 350 9631, G02B 632

Patent

active

047010118

ABSTRACT:
A novel expanded beam coupling arrangement for use in association with single mode fibers is disclosed. An appropriate length of multimode fiber is fused to the endface of an input single mode fiber, where the length of the multimode fiber is chosen to provide the desired lensing conditions of the input beam. The multimode fiber is thus used as a lens, but provides many advantages over prior art optical connectors which use conventional quarter-pitch GRIN lenses epoxied to the fiber endfaces. In particular, the misalignment associated with the epoxied arrangement is reduced since the multimode fiber-lens connector of the present invention may be chosen to comprise the same outer diameter as the single mode fiber. Additionally, the use of a section of optical fiber as a lens allows for a fused connection to be used instead of an epoxied connection, which results in a more stable and rugged interface between the fiber and the lens.

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"Coupling Characteristics Between Single Mode Fiber . . . ", IEEE Trans. Micro. Theory and Tech., vol. MTT-30, No. 6, Jun. 1982, Kishimoto et al., pp. 882-893.
"Experimental Investigation of Beam Spot Size . . . ", Electron. Lett., vol. 20, No. 15, Jul. 1984, Keil et al., pp. 621-622.

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