Three Dimensional Optical Interconnect on Organic Circuit Board

Abstract

We propose high speed optical interconnection which is three dimensional optical lanes using polymer materials fabricated on an organic circuit board with metal lines and pads. These optical lanes transmit optical signals not only on a plane surface but into the other side of a circuit board. It has following three particular portions; (1) Curved parallel optical waveguide; (2) 45 degree reflection mirror; (3) Optical via hole.Four channel three dimensional optical lanes with current electrical lines and pads are newly developed on the organic circuit board named CPCore TM . We characterize the optical lanes by transmission loss and passed through eye diagram, and optical signal transmission is confirmed.Then optical signal transmission up to 3Gbps/channel are demonstrated with 850nm VCSEL flip-attached on the circuit board with active and passive electronic devices and components as driving circuit.

Flexible opto-electronic circuit board for in-device interconnection

“…Some studies have been reported to form optical through holes in electric circuit boards [8,9]. However, to simplify the fabrication process and to reduce optical loss, the elimination of optical through holes has been desired.…”

Low Loss Polymer Optical Waveguide Replicated from Flexible Film Stamp Made of Polymeric Material

“…[6][7][8] In particular, multi-mode polymer optical waveguides are very useful for short transmission lengths, for example with in-shelf connection such as that needed for inter-and intra-board connection in servers and routers. 9,10) Multi-mode waveguides have a large core size of about 50 m square, which facilitates the alignment of the waveguide and the fiber cores. 11) This is effective in reducing the assembly cost.…”

Three-dimensional optical lines fabricated onto substrate for on-board interconnection

“…The first demonstration is the feasibility of on-board, chip-to-chip optical interconnections using three dimensional optical lines consists of multi-channel, S-shape multimode polymer optical waveguides, mirrors, optical via holes for vertical transmission lines. Optical transmitter and receiver circuits were assembled onto the substrate with flip-attached VCSEL and PIN-Photodetector (PIN-PD) [9] .…”