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Recent advances in the miniaturization of optical ICs such as InP gain-compensated AWGs, all-optical flip-flops and LD arrays have made it possible to realize adjacent optical device spacing of 10μm-order. Size reductions are limited, however, by the 250μm pitch of optical fiber arrays. The OPLEAF, shown in Fig.1, converts the pitch from 250μm to 30μm and provides a miniaturized interface between fibers and the optical IC. A conventional method for pitch conversion is the insertion of another PLC-waveguide device, it is necessary to connect the PLC with submicron-precision alignment at its both ends. OPLEAF guides the optical fiber array whose tip parts are etched down to 30μm in diameter and connects it to the optical IC directly; thus alignment is necessary only at one end. From BPM simulation results shown in Fig.2, we adopted the minimum diameter for no-loss,30μm and a radius of 22mm to accommodate the guide part within 3x8mm2 area while the loss less than 1.3dB. Fig.3 shows overview of OPLEAF. Compared with 250μm pitch, the tip parts are aligned very closely shown as Fig.4. Fig.5 shows an experimental result for coupling loss of OPLEAF after 8 samples. The cross-talk between two adjacent ports were less than -40dB.The maximum curvature loss was evaluated to be 1.5dB from the difference between the values at port4 and port1. This value agrees well with the 1.3dB obtained from the BPM simulation. We proposed and fabricated an OPLEAF. Its optical results agreed well with the designed values. OPLEAF is superior to a conventional PLC due to its unification with a tape fibe and is therefore in principal free from alignment and polarization dependence. Furthermore, it is possible to fabricate lenses on the tip parts directly. OPLEAFs are low cost relative to optical ICs, and thus allows for cost reductions of not only the IC itself but also the finished package. The cost of an optical IC is roughly proportional to its area, which mainly consists of the waveguide parts for interface to a conventional fiber array. OPLEAF allows miniaturization of optical ICs.

OPLEAF Fiber Array for High Density Optical IC