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Crimp-And-Cleave Lensed Terminus For Military Cylindrical Connectors

A novel size 16 terminus has been developed for use with fiber optic cable in military cylindrical connectors. Based on the use of gradient index lenses, the terminus has been designed for aviation type fiber optic cable. The use of lenses provides expanded beam coupling from one fiber to the second. This allows the termini to to the full range of longitudinal separations to be found in standard military cylindrical connectors without the complex alternative of springs to keep the fiber end faces in near or actual contact. Angular alignment is preserved by close control of tolerances in the pin terminus and the socket terminus alignment sleeve. And excellent resistance to lateral misalignments is one of the principal advantages of expanded beam interconnection. The terminus system avoids any use of epoxies or other adhesives by the use of a novel crimp-and-cleave termination. Besides eliminating the problems of epoxy shelf life, mixing ratio, pot life, mess, and production inefficiency, the new crimp-and-cleave design also requires no electrical power and pro-vides greatly improved termination strength and resistance to bond failure under thermal and tensile loads. Production efficiency is improved because any shortcoming in termination causes the loss of only a crimp sleeve rather than an entire terminus. The termination system has been demonstrated in thermal shock (-55 to +150 C), 1000 hours exposure to 150 C, 24 hour random vibration at 39.6 g's rms, and over 25 other environmental and mechanical tests, with changes in loss consistently under 0.5 dB.