Time-division optical microarea networks

Paul R. Prucnal; Steven T. Johns; Mark F. Krol; John L. Stacy

doi:10.1117/12.25546

1 April 1991 Time-division optical micro-area networks

Paul R. Prucnal, Steven T. Johns, Mark F. Krol, John L. Stacy

Proceedings Volume 1389, Microelectronic Interconnects and Packages: Optical and Electrical Technologies; (1991) https://doi.org/10.1117/12.25546
Event: Advances in Intelligent Robotics Systems, 1990, Boston, MA, United States

Abstract

Optical micro-area networks (iANs) are proposed as a way of providing flexible communications among VLSI processors and eliminate electrical I/O bottlenecks. Sharedmedium multiple access protocols in jtANs can avoid the access delays associated with statistical multiple access protocols (which are unacceptable in multiprocessor applications) and increase the throughput at the expense of wasting optical bandwidth. Time-division multiple access (TDMA) may be more practical to implement in a pAN than other shared-medium multiple access protocols such as frequency-division or code-division. Since the total throughput of TDMA is given by the inverse of the optical pulsewidth the throughput can be increased by making the pulse width small. Accomplishing this goal requires avoiding the use of low-bandwidth electronics in the portion of the iAN that directly processes these short pulses. Instead optical processing can be used in those protions of the network. The architecture of a TDMA pAN which uses optical multiple access processing and is self-clocking is described in detail. Experimental demonstrations of key subsytems for optically generating modulating synchronizing delaying and correlating short optical pulses are presented. The feasibility of a variable-integer-delay line which provides rapid tuing wide tuning range and high precision is demonstrated. A transmitter consisting of a mode-locked laser with an external modulator is used in the TDMA iAN since arbitrarily short pulses can be controlled with a modulator that need only operate at the bit rate which translates

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Paul R. Prucnal, Steven T. Johns, Mark F. Krol, and John L. Stacy "Time-division optical micro-area networks", Proc. SPIE 1389, Microelectronic Interconnects and Packages: Optical and Electrical Technologies, (1 April 1991); https://doi.org/10.1117/12.25546

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