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Authors: A. Ribeiro, A. Ruocco, L. Van Acker, W. Bogaerts
Title: Demonstration of a 4x4-port universal linear circuit
Format: International Journal
Publication date: 11/2016
Journal/Conference/Book: Optica
Editor/Publisher: OSA, 
Volume(Issue): 3(12) p.1348-1357
DOI: 10.1364/OPTICA.3.001348
Citations: 175 ( - last update: 21/7/2024)
138 (OpenCitations - last update: 27/6/2024)
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We present a silicon implementation of a 4-port universal linear optical circuit. Instead of predefining the exact functionality of a photonic circuit at design time, we demonstrate a simple generic silicon photonic circuit, combined with electronic control and software feedback, that can perform any linear operation between its 4 input and output ports. The circuit consists of a network of thermally tunable symmetric Mach-Zehnder interferometers with phase and amplitude control, in-circuit optical power monitors, and local software controlled feedback loops. The circuit can be configured using a training mechanism, which makes it to self-adapt to implement the desired function. We use the circuit to demonstrate an adaptive, universal beam coupler, as well as a switch matrix.

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