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Updated: Jun 30, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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All-optical regenerative NRZ-to-RZ format conversion using coupled ring-resonator optical waveguide.

Tong Ye1, Cishuo Yan, Yuanyuan Lu

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

Optics Express
|October 1, 2008
PubMed
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This study presents a novel silicon chip method to convert distorted non-return-to-zero (NRZ) signals into high-quality return-to-zero (RZ) signals. The coupled ring-resonator optical waveguide (CROW) technology simplifies signal regeneration and format conversion.

Area of Science:

  • Photonics
  • Optical Communications
  • Integrated Optics

Background:

  • Non-return-to-zero (NRZ) signals often suffer from distortion, limiting data transmission quality.
  • Regenerating and converting signals to return-to-zero (RZ) format is crucial for high-speed optical networks.
  • Existing methods for signal format conversion can be complex and system-intensive.

Purpose of the Study:

  • To propose and verify a novel scheme for format conversion from distorted NRZ to high-quality RZ signals.
  • To leverage the nonlinear properties of coupled ring-resonator optical waveguides (CROWs) for signal processing.
  • To achieve integrated format conversion and signal regeneration on a silicon chip.

Main Methods:

  • Utilizing the nonlinearity of a silicon-based coupled ring-resonator optical waveguide (CROW).

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  • Feeding a distorted NRZ signal and an RZ pulse train into the CROW.
  • Employing the CROW as a nonlinear step gate to shape and equalize RZ pulses.

    • Main Results:

    • Successful conversion of distorted NRZ signals to amplitude-equalized RZ pulses.
    • Demonstrated feasibility of the scheme through simulations at 10 Gb/s and 40 Gb/s.
    • Integration of format conversion and regeneration simplifies the overall system architecture.

    Conclusions:

    • The proposed CROW-based scheme offers an efficient method for NRZ to RZ signal format conversion.
    • This approach integrates signal regeneration, simplifying optical communication systems.
    • The silicon chip implementation promises compact and scalable solutions for future optical networks.