Phase-encoded optical sampling for analog-to-digital converters

1 September 2000

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters

Vol. 12 (9) , 1237-1239
https://doi.org/10.1109/68.874247

Abstract

A high-speed optical sampling system for electrical signals has been developed using a gain-switched diode laser and a dual-output Mach-Zehnder interferometer. The optical phase shift between the branches of the interferometer is highly linear in the applied electrical signal. The phase shift is encoded in the two outputs of the interferometer and is recovered through digital signal processing. Analog-to-digital (A/D) conversion with 78-dB spur-free dynamic range is demonstrated. Our phase-encoded sampling technique allows high-resolution (12-bit) conversion with high linearity at practical laser power levels.

Keywords

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