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Updated: May 23, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Published on: August 5, 2013

Chirp-free optical return-to-zero modulation based on a single microring resonator.

Lili Sun1, Tong Ye, Xiaowen Wang

  • 1Department of Electronic Engineering, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China.

Optics Express
|March 29, 2012
PubMed
Summary

This study introduces a novel chirp-free optical return-to-zero (RZ) modulator. The device utilizes a double coupled microring resonator for versatile RZ modulation formats, demonstrating feasibility at 10 Gbit/s.

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Area of Science:

  • Photonics and Optical Communications
  • Integrated Optics

Background:

  • Optical modulators are crucial for high-speed data transmission.
  • Achieving chirp-free modulation formats like return-to-zero (RZ) is essential for signal integrity.

Purpose of the Study:

  • To propose and theoretically investigate a novel chirp-free optical RZ modulator.
  • To demonstrate the implementation of various RZ modulation formats using the proposed device.

Main Methods:

  • Utilized a double coupled microring resonator structure.
  • Employed static and time-domain coupled-mode theory (CMT) for analysis.
  • Performed numerical simulations to verify performance.

Main Results:

  • Successfully demonstrated chirp-free RZ modulation.

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  • Deduced criteria for achieving RZ modulation.
  • Verified feasibility for RZ phase-shift-keying (RZ-PSK), carrier-suppressed RZ (CSRZ), and RZ intensity modulation formats.
  • Confirmed operation at 10 Gbit/s.

    • Conclusions:

    • The proposed double coupled microring resonator is an effective platform for chirp-free RZ modulation.
    • The modulator supports multiple RZ formats, offering flexibility for optical communication systems.
    • The design shows promise for high-speed optical data transmission applications.