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Proceedings Paper

Clock Skew Analysis For Si And GaAs Receivers In Optical Clock Distribution Systems
Author(s): Ragai L. Khalil
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Paper Abstract

Controlling system clock skew at the desired system cycle time is the major challenge in the design of a clock distribution network. Optical techniques offer a potential alternative to conventional electrical means for distributing clock signals. For optical clock distribution, the limiting factors are the level of optical power available to the photodetectors and the timing uncertainty (skew) in optical receivers. This paper presents an analysis for receiver skew in terms of the RMS timing jitter, static skew and photodetector-induced skew. Based on this analysis, an optical fanout model is developed relating system skew to the received optical power for various Si and GaAs receiver configurations. This model predicts that, for high optical fanout levels (in the order of 100), system clock skew in the range of 100 to 200ps is achievable using avalanche photo-diode receivers. Skew measured for an experimental system was 120 ps, correlating well with the analytical model.

Paper Details

Date Published: 23 January 1990
PDF: 6 pages
Proc. SPIE 1178, Optical Interconnects in the Computer Environment, (23 January 1990); doi: 10.1117/12.963382
Show Author Affiliations
Ragai L. Khalil, Digital Equipment of Canada Ltd. (Canada)


Published in SPIE Proceedings Vol. 1178:
Optical Interconnects in the Computer Environment
James Pazaris; Gerald R. Willenbring, Editor(s)

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