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Proceedings Paper

Optical clock distribution in supercomputers using polyimide-based waveguides
Author(s): Bipin Bihari; Jianhua Gan; Linghui Wu; Yujie Liu; Suning Tang; Ray T. Chen
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Paper Abstract

Guided-wave optics is a promising way to deliver high-speed clock-signal in supercomputer with minimized clock-skew. Si- CMOS compatible polymer-based waveguides for optoelectronic interconnects and packaging have been fabricated and characterized. A 1-to-48 fanout optoelectronic interconnection layer (OIL) structure based on Ultradel 9120/9020 for the high-speed massive clock signal distribution for a Cray T-90 supercomputer board has been constructed. The OIL employs multimode polymeric channel waveguides in conjunction with surface-normal waveguide output coupler and 1-to-2 splitters. Surface-normal couplers can couple the optical clock signals into and out from the H-tree polyimide waveguides surface-normally, which facilitates the integration of photodetectors to convert optical-signal to electrical-signal. A 45-degree surface- normal couplers has been integrated at each output end. The measured output coupling efficiency is nearly 100 percent. The output profile from 45-degree surface-normal coupler were calculated using Fresnel approximation. the theoretical result is in good agreement with experimental result. A total insertion loss of 7.98 dB at 850 nm was measured experimentally.

Paper Details

Date Published: 13 April 1999
PDF: 11 pages
Proc. SPIE 3632, Optoelectronic Interconnects VI, (13 April 1999); doi: 10.1117/12.344600
Show Author Affiliations
Bipin Bihari, Univ. of Texas/Austin (United States)
Jianhua Gan, Univ. of Texas/Austin (United States)
Linghui Wu, Univ. of Texas/Austin (United States)
Yujie Liu, Univ. of Texas/Austin (United States)
Suning Tang, Radiant Research, Inc. (United States)
Ray T. Chen, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 3632:
Optoelectronic Interconnects VI
Julian P. G. Bristow; Suning Tang, Editor(s)

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