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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Optical precursors in coupled-resonator-induced transparency.
Tohru Oishi1, Ryuta Suzuki, Parvin Sultana
1Department of Physics, Faculty of Science, Shizuoka University, 836, Ohya, Shizuoka, 422-8529, Japan.
Optics Letters
|July 25, 2012
Summary
Optical precursors and the main signal propagate separately in coupled ring resonators. This phenomenon, observed in coupled-resonator-induced transparency (CRIT), shows distinct transient spikes and a gradually growing signal.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Optical Resonators
Background:
- Coupled ring resonators are fundamental structures in photonics for manipulating light.
- Understanding pulse propagation dynamics is crucial for optical signal processing.
- Coupled-resonator-induced transparency (CRIT) offers unique control over light transmission.
Purpose of the Study:
- To experimentally investigate the propagation of square-modulated optical pulses in a coupled ring resonator system.
- To analyze the formation and characteristics of transient spikes and the main signal during pulse propagation.
- To elucidate the role of spectral components and resonator response in observed phenomena.
Main Methods:
- Experimental setup utilizing a coupled ring resonator.
- Generation and propagation of temporally square modulated optical pulses.
- Observation and analysis of transient spikes and the main signal dynamics.
Main Results:
- Sharp transient spikes were observed at the onset of square pulse propagation.
- The main signal exhibited a gradual rise governed by CRIT, with a time constant set by the second resonator.
- Transient spikes were identified as optical precursors resulting from spectral components outside the resonator's response bandwidth.
Conclusions:
- The experiments successfully demonstrated the separate observation of optical precursors and the main signal in CRIT.
- The amplitudes of precursors and the main signal were comparable to the incident step.
- This study provides insights into the complex dynamics of optical pulse propagation in coupled resonator systems.
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