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Related Experiment Video

Updated: May 31, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Comb filter with independently tunable wavelength spacing and bandwidth using cascaded variable differential group

H-Y Jiang¹, L-S Yan, J Ye

¹Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, China.

|June 21, 2011

Summary

We demonstrate an all-optical comb filter with tunable wavelength spacing and bandwidth. This novel design achieves over 10 dB sidelobe reduction using three cascaded variable differential-group-delay elements for precise control.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Last Updated: May 31, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Photonics and Optical Engineering
Integrated Optics
Signal Processing

Background:

Optical comb filters are crucial components in wavelength-division multiplexing (WDM) systems.
Existing designs often lack independent tunability of key parameters like wavelength spacing and bandwidth.
Controlling sidelobe levels is essential for signal integrity.

Purpose of the Study:

To propose and demonstrate an all-optical comb filter with independently tunable wavelength spacing and bandwidth.
To achieve significant sidelobe reduction through adjustable filter modules.
To validate the design through theoretical analysis and experimental verification.

Main Methods:

Utilizing three cascaded variable differential-group-delay (DDG) elements.
The first DDG element controls wavelength spacing.
The second and third DDG elements independently tune sidelobe suppression ratio and bandwidth, respectively.

Main Results:

Demonstrated independent tunability of wavelength spacing and bandwidth.
Achieved >10 dB sidelobe reduction by adjusting the three DDG elements.
Experimental validation confirmed the theoretical predictions for the comb filter's performance.

Conclusions:

The proposed all-optical comb filter offers flexible and independent control over its spectral characteristics.
The cascaded DDG element approach provides an effective method for sidelobe suppression and bandwidth adjustment.
This tunable comb filter has potential applications in advanced optical communication and signal processing systems.