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Proceedings Paper

Phase linearity and uniformity in optoelectronic-VLSI receiver arrays
Author(s): Michael B. Venditti; Joshua D. Schwartz; David V. Plant
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Paper Abstract

Parallel synchronous digital links require tight control over inter-channel skew in order to obtain maximum performance. In parallel optical interconnects (POIs), inter-channel skew can arise from differences in optical and electrical path lengths as well as latency variations through transmitters and receivers. The receiver pre-amplifier is particularly susceptible to latency variation. In POI applications such as optoelectronic-VLSI, pre-amplifiers can exhibit variable latency and gain resulting from differences in optical power levels across the receiver array due to transmitter, laser, detector, or optical system non-uniformity. This establishes an input DC photocurrent and pre-amplifier operating point that varies across the array, resulting in gain and phase non-uniformity. We consider different receiver pre-amplifier designs and the susceptibility of their gain and phase delay uniformity to operating point variations. Feedback circuitry that stabilizes the pre-amplifier operating point is considered as a potentially robust approach for array-scale POI skew reduction. Optical ring oscillators are used to characterize the phase delay of different pre-amplifier designs by measuring the period of oscillation as a function of optical system power throughput.

Paper Details

Date Published: 15 November 2002
PDF: 10 pages
Proc. SPIE 4788, Photonic Devices and Algorithms for Computing IV, (15 November 2002); doi: 10.1117/12.451604
Show Author Affiliations
Michael B. Venditti, McGill Univ. (Canada)
Joshua D. Schwartz, McGill Univ. (Canada)
David V. Plant, McGill Univ. (Canada)


Published in SPIE Proceedings Vol. 4788:
Photonic Devices and Algorithms for Computing IV
Khan M. Iftekharuddin; Abdul Ahad S. Awwal, Editor(s)

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