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Related Experiment Video

Updated: Nov 19, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Optical isolation using microring modulators.

Nathan Dostart, Hayk Gevorgyan, Deniz Onural

|February 2, 2021

Summary

This summary is machine-generated.

Researchers developed a novel on-chip optical isolator for integrated photonics. This compact device uses temporal modulation, overcoming limitations of traditional magneto-optic isolators for silicon photonic circuits.

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Last Updated: Nov 19, 2025

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Published on: April 4, 2017

Area of Science:

Integrated Photonics
Non-reciprocal Optics
Silicon Photonics

Background:

Optical isolators are crucial for bulk and fiber optics but are missing in integrated photonics.
Integrating magneto-optic materials into CMOS fabrication is challenging.
Temporal modulation offers an alternative path for achieving non-reciprocity in integrated systems.

Purpose of the Study:

To demonstrate a non-reciprocal optical element suitable for on-chip integration.
To develop a compact optical isolator compatible with silicon photonic processes.
To enable the integration of isolator functionality into standard CMOS foundry platforms.

Main Methods:

Designed a non-reciprocal element using a pair of microring modulators and a microring phase shifter.
Utilized an active silicon photonic process for device fabrication.
Combined the non-reciprocal element with standard bandpass filters to create an on-chip isolator.

Main Results:

Achieved optical isolation of up to 13 dB.
Measured a 3 dB bandwidth of 2 GHz and an insertion loss of 18 dB.
Successfully transmitted a 4 Gbps optical data signal with a clear eye diagram.

Conclusions:

Demonstrated a functional on-chip optical isolator based on temporal modulation.
The compact design and improved modulation efficiency pave the way for modulator-based isolators.
This technology could become a standard component in integrated photonics CMOS foundry libraries.