High speed 128-element avalanche photodiode array for optical computing applications

Paul P. Webb

doi:10.1117/12.2321738

1 December 1991 High speed 128-element avalanche photodiode array for optical computing applications

Paul P. Webb

Proceedings Volume 1563, Optical Enhancements to Computing Technology; (1991) https://doi.org/10.1117/12.2321738
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A high speed 128-element linear avalanche photodiode array, suitable for use in optical computing applications, has been designed and fabricated. The use of a guard ring surrounding the array results in low dark current and noise in the individual elements. Operation at gain I 00 has shown good APD performance, with element dark currents less than 3 nA, noise less than 0.1 pNHz1', and rise and fall times about 1 ns. The design of the device makes it suitable for operation at frequencies up to 200 MHz. A solder bump mounting technique, and multi-layer substrate design are described which minimize capacitance between the elements, thereby maintaining low crosstalk. For further reduction of crosstalk, an alternative chip design is described, in which a guard ring runs between all the elements.

Citation Download Citation

Paul P. Webb "High speed 128-element avalanche photodiode array for optical computing applications", Proc. SPIE 1563, Optical Enhancements to Computing Technology, (1 December 1991); https://doi.org/10.1117/12.2321738

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KEYWORDS

Capacitance

Avalanche photodiodes

Avalanche photodetectors

Optical computing

Optical components

Transition metals

Diffusion

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