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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Continuously tunable 1 byte delay in coupled-resonator optical waveguides.

Andrea Melloni1, Francesco Morichetti, Carlo Ferrari

  • 1Dipartimento di Elettronica e Informazione, Politecnico di Milano, Milano, Italy. melloni@elet.polimi.it

Optics Letters
|October 17, 2008
PubMed
Summary
This summary is machine-generated.

This study demonstrates an optical waveguide using coupled ring resonators to control data stream delays. Eight rings achieved an 8-bit delay with minimal pulse broadening, offering efficient data management.

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Area of Science:

  • Photonics and Optical Engineering
  • Telecommunications Technology
  • Integrated Optics

Background:

  • Optical waveguides are crucial for high-speed data transmission.
  • Controlling data stream delay is essential for network management and signal processing.
  • Ring resonators offer potential for compact and efficient optical delay lines.

Purpose of the Study:

  • To investigate the use of reconfigurable coupled-resonator optical waveguides for controlling data stream delays.
  • To achieve a significant delay (8 bit lengths) using a minimal number of ring resonators.
  • To analyze the impact of waveguide loss and backreflections on device performance.

Main Methods:

  • Fabrication of a reconfigurable coupled-resonator optical waveguide using directly coupled ring resonators.
  • Modulation of data streams at tens of gigabits per second.
  • Experimental investigation of delay performance, pulse broadening, fractional loss, and storage efficiency.
  • Analysis of the limiting effects of waveguide loss and spurious backreflections.

Main Results:

  • Achieved a delay of 8 bit lengths (1 optical byte) using only eight rings.
  • Observed small pulse broadening and a fractional loss of 1 dB/bit.
  • Demonstrated high storage efficiency of 1 bit/ring.
  • Identified a trade-off between storage efficiency and pulse distortion.

Conclusions:

  • The coupled-resonator optical waveguide provides an efficient, reliable, and low-power method for managing data stream delays.
  • The device enables easy and hitless delay management due to its high storage efficiency.
  • Waveguide loss and backreflections are critical factors limiting performance.
  • Higher storage efficiency inherently leads to increased pulse distortion, necessitating careful design considerations.