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Authors: I. Luntadila Lufungula, B. Kuyken
Title: Non-reciprocal transmission in ring resonators with saturable absorption
Format: International Conference Presentation
Publication date: 11/2022
Journal/Conference/Book: Annual Symposium of the IEEE Photonics Society Benelux Chapter 2022
Location: Eindhoven, Netherlands
Citations: Look up on Google Scholar
Download: Download this Publication (310KB) (310KB)


On-chip non-reciprocal devices are useful building blocks for all-optical signal processing but are hard to integrate on-chip. Magneto-optic or nonlinear devices can be used but these require strong magnetic fields and high optical powers respectively.
We use a non-linear add-drop ring resonator to enable nonreciprocal behavior at reasonable powers ( ~10 dBm). The ring has different power coupling coefficients 𝜅1>𝜅2 to the bottom and top bus waveguides which results in different powers in the ring when going from the add to the drop port and vice versa.
By adding a saturable absorber in the ring we turn this difference in power into a difference in transmission since in one direction the loss will be saturated while the other direction will have significant extra loss, breaking the reciprocity in the system. In this work we simulate the theoretical properties and discuss the experimental feasibility of an on-chip implementation of this device. With a simple saturable absorber model we simulate 34 dB extinction ratio between the different propagation directions with only 2.3 dB of insertion loss in the forward direction.

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