A through-the-backplane, circuit pack optical connector, utilizing a novel alignment mechani3m, is described. Up to 13 fibers can be interconnected in a space of 0.5" x 0.6" x 2.26". Average loss is 0.53 dB with 50/125 fiber. Laboratory tests with single mode fiber (8.3/125) in a modified connector have shown an average loss of about 0.7dB. All measurements were made without index matching material.
W. J. Parzygnat,
"A High Fiber Density Optical Connector For Use In Electronic Packaging Systems", Proc. SPIE 0752, Digital Optical Computing, (11 August 1987); doi: 10.1117/12.939930; https://doi.org/10.1117/12.939930