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Fiber Optic Connector Ferrule Design With Reduced ThermaL stresses

IP.com Disclosure Number: IPCOM000037512D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Galyon, GT: AUTHOR [+5]

Abstract

Disclosed is a fiber optic connector ferrule design that reduces the stresses in the fiber arising from thermal coefficients of expansion (TCEs) mismatch between the fiber, the ferrule and the epoxy. Reduction of stresses in fiber during thermal shock is important to avoid fiber cracking.

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Fiber Optic Connector Ferrule Design With Reduced ThermaL stresses

Disclosed is a fiber optic connector ferrule design that reduces the stresses in the fiber arising from thermal coefficients of expansion (TCEs) mismatch between the fiber, the ferrule and the epoxy. Reduction of stresses in fiber during thermal shock is important to avoid fiber cracking.

A typical presently used ferrule design is shown in Fig. 1. The fiber end entering the microhole is stripped in one step. Fiber is epoxied into the microhole. Since the TCE of the epoxy is about two orders of magnitude higher than the fiber, stresses as a result of thermal shock may fracture the fiber at the microhole entrance.

The proposed ferrule design, shown in Fig. 2, reduces the stresses in the fiber in the microhole entrance region by decreasing the radial thickness of the epoxy in the critical region of the microhole entrance. Finite element analysis shows that stress in fiber is proportional to the epoxy radial thickness. The ferrule is modified so that about one-third of its length has a hole about 550 micrometers in diameter to contain the fiber with just the buffer coating. The fiber is fully clad outside the ferrule, like it is in the present design shown in Fig. 1. The fiber stripping in the proposed design is done in two steps.

Disclosed anonymously.

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