ParaBIT-1: 60-Gb/s-throughput parallel optical interconnect module

We previously proposed ParaBIT (parallel inter-board optical interconnection technology), and developed a prototype front-end module, called ParaBIT-0, with a total throughput of 28 Gb/s (700 Mb/s×40 ch). Aiming at higher throughput, lower cost, and further miniaturization, we are now developing a version, called ParaBIT-1, which is designed to achieve a total throughput of 60 Gb/s (1.25 Gbit/s×480-ch). To achieve a compact and high-throughput module, we developed a new compact high-density packaging structure and cost-effective optical coupling system for ParaBIT-1. This packaging structure enabled us to reduce the volume of ParaBIT-1 to 9 cc, which is about one-third that of ParaBIT-0 (25 cc). The optical coupling system consists of a new structure 24-fiber BF (bare fiber) connector whose main parts are made of molded plastic and a 24-channel optical coupling component using new polymeric optical waveguide film. The optical coupling component is composed of a 24-ch waveguide film with 45° mirrors and the 24-fiber BF connector interface, and can be assembled by passive alignment. The film has high thermal stability to allow soldering reflow processes, and is fabricated by direct photo-patterning. ParaBIT-1 met the design target of 1.25 Gb/s per channel