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$Interference and Diffraction$ 02:18

Interference and Diffraction

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...

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Related Experiment Video

Updated: Apr 19, 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

Experimental demonstration of a microdisk resonator filter/buffer utilizing two-mode interference.

Qingzhong Huang, Juguang Chen, Ge Song

|December 10, 2014

Summary

This summary is machine-generated.

This study demonstrates a microdisk-resonator (MDR) filter using two-mode interference for optical filtering and buffering. The device shows tunable bandpass filtering and optical buffering capabilities on a silicon platform.

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Last Updated: Apr 19, 2026

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Microdisk resonators (MDRs) are key components in integrated photonics.
Whispering-gallery modes (WGMs) in MDRs enable various optical functions.
Two-mode interference offers novel functionalities for optical signal processing.

Purpose of the Study:

To experimentally demonstrate a microdisk-resonator (MDR)-based filter for filtering and buffering applications.
To investigate optical filtering and buffering behavior generated by two-mode interference in MDRs.
To analyze the influence of resonance spacing on filter performance.

Main Methods:

Fabrication of MDRs on a silicon-on-insulator platform using nanofabrication.
Excitation of multiple WGMs in the MDR.
Symmetric coupling of the MDR to two bus waveguides.
Experimental characterization of filtering and buffering performance.

Main Results:

Achieved bandpass filtering with a 0.66 nm bandwidth and <1 dB in-band ripple.
Demonstrated optical buffering with 5.85 dB insertion loss and 15 ps time delay.
Observed unique filter characteristics due to interference between spectrally nearby resonances.
Validated experimental results with theoretical simulations.

Conclusions:

The demonstrated MDR filter effectively performs both optical filtering and buffering functions.
Two-mode interference in MDRs provides a versatile mechanism for tunable optical signal processing.
The device shows promise for applications in optical communication and signal processing.