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Related Experiment Video

Updated: Jun 11, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Published on: April 4, 2017

Interferometer-assisted add-drop Sagnac ring for reconfigurable multi-channel filtering.

Tiantian Li, Zihan Bai, Yumeng Liu

|June 10, 2026

Summary

We developed a compact Sagnac ring add-drop filter using a Mach-Zehnder interferometer (MZI) for programmable multi-channel optical filtering. This device offers tunable wavelength, bandwidth, and extinction ratio for advanced optical routing.

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Last Updated: Jun 11, 2026

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Published on: April 26, 2014

Area of Science:

Photonics
Optical Engineering
Integrated Optics

Background:

Traditional optical filters often lack programmability and compactness.
Achieving independent control over multiple filter parameters (wavelength, bandwidth, extinction ratio) is challenging.

Purpose of the Study:

To introduce a novel interferometer-assisted Sagnac ring add-drop filter.
To demonstrate independent programmability of key optical filter characteristics.
To provide a compact and reconfigurable multi-channel optical filtering solution.

Main Methods:

Replacing the fixed coupling section of a Sagnac ring with a thermally tuned Mach-Zehnder interferometer (MZI).
Utilizing phase modulation for continuous tuning of spectral window and bandwidth.
Characterizing the filter's free spectral range (FSR), center-wavelength tuning, extinction ratio, and channel response.

Main Results:

The device achieves multi-channel transmission with independent programmability.
Center-wavelength tuning over ~50% of the FSR (~0.270 nm) is demonstrated.
Tunable extinction ratios from 8.8 to 21.1 dB and bandwidth tuning from 0.180 to 0.240 nm are achieved.
The filter exhibits complementary add-drop functionality.

Conclusions:

The proposed interferometer-assisted Sagnac ring offers a compact and reconfigurable solution for multi-channel optical filtering.
Its independent programmability makes it a versatile building block for scalable optical networks.
This technology enables advanced optical routing and signal processing applications.