Para BIT:Parallel Optical Interconnection for Large-Capacity ATM Switching Systems

Yasuhiro ANDO
Mitsuo USUI
Akira OHKI
Nobuo SATO
Nobuyuki TANAKA
Toshiaki KAGAWA

IEICE TRANSACTIONS on Communications   Vol.E82-B    No.2    pp.412-421
Publication Date: 1999/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Joint Special Issue on Photonics in Switching: Systems and Devices)
Category: Assembly and Packaging Technologies
optical interconnection,  ATM switch,  VCSEL,  optical connector,  optical waveguide,  multichip,  

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We have been working on a project called ParaBIT (for parallel inter-board optical interconnection technology) to achieve large-capacity switching systems. The ParaBIT module being developed as the first step in this project is a front-end module with 40 channels providing throughput of 28 Gb/s, cost-effectiveness and compactness. To realize the module, this project has developed five novel technologies: (1) 850-nm 10-ch Vertical-cavity Surface-emitting laser (VCSEL) arrays as very cost-effective light sources, (2) new high-density multiport bare fiber connectors that do not need a ferrule and spring, (3) passive optical alignment using polymeric optical waveguide film with a 45-degree mirror for coupling to the optical array chips and the waveguide, (4) transferred multichip bonding to mount optical array chips on a substrate with a positioning error of only a few micrometers, and (5) simple electronic circuits with a fixed-decision-level receiver and an APC-less transmitter, and low power consumption. Experimental results show that the design targets of throughput of 700 Mb/s per channel and a compact and cost-effectiveness structure were met. Thus, ParaBIT is a promising technology for large-capacity switching systems.