Abstract: A plastic multipin connector that provides an optical-electronic interface between the end of a fiberoptic cable and an electronic circuit utilizes a flexible multilayer printed circuit with a ground plane layer on the outside of the folded circuit within a plastic housing and an upright tab intact with the ground plane layer on the outside of the tab and at least one patterned conductor layer. The upright tab is used to make connections of the optoelectronic device with the printed circuit at the base of the device leads to virtually eliminate any lead length from the device to the printed circuit that is not shielded from external noise.

Abstract: A single-mode optical fiber delay line for filtering at high frequencies utilizes an nth order cascaded recirculating configuration comprised of n+1 couplers. Each coupler has two input fibers and two output fibers. One of the output fibers of each coupler except the last is connected to one of the input fibers of the next coupler in cascade to form a feed-forward path. The other output fiber of each coupler except the first is connected to the other input fiber of the preceding coupler, thus forming a feed-backward path. The feed-forward path and the feed-backward path of adjacent couplers form a delay loop. The delay time in each succeeding delay loop is increased by an incremental delay .tau. equal to the reciprocal of the center frequency of the filter. The delay in the first delay loop is selected to be some multiple m of .tau., where m is an integer selected for a total delay T which permits the use of optical fiber of a length sufficient to avoid bending losses in the optical fiber.