24 May 2005 High speed multi-channel optical sampling technique for analog-to-digital converters
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Abstract
We describe the design and implementation of an eight channel optical sampling technique for analog-to-digital (A/D) converters. A single mode-locked laser source with a pulse reprtition rate of 250 MHz is used to generate eight highly synchronized smapling clocks each running at 500 MHz. The basic sampling circuit consistes of a reversed-biased photodiode which operates as a very fast optoelectronic switch. Actuating the photodiode ON and OFF with mode-locked laser pulses produce sampled RF signals. In the implementation of this A/D architecture, the optical clocks are delayed relative to each other using fixed passive delay lines. The time-shifted clock signals allow for sampling different phases of the input RF signal resulting in an aggregate sampling rate of 4 Gigasamples/sec (GSPS). We shall show the optical clock setup necessary in order to achieve a 4 BSPS rate. We shall also present sampling results for input RF signals with frequencies ranging from 10 to 500. Interleaving of the sampled RF output from different sampling channels will also be demonstrated.
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Mohammad Noman, Eric Donkor, Michael J. Hayduk, Rebecca J. Bussjager, "High speed multi-channel optical sampling technique for analog-to-digital converters", Proc. SPIE 5814, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications, (24 May 2005); doi: 10.1117/12.605420; https://doi.org/10.1117/12.605420
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