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Related Experiment Video

Updated: Feb 25, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Carrier-phase-estimation algorithm featuring fast trackability for high-speed coherent WDM PON based on RSOA.

Daeho Kim, Byung Gon Kim, Sung Hyun Bae

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    |August 10, 2017
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    Summary

    A new carrier phase estimation method accurately tracks high-speed Quadrature Phase-Shift Keying (QPSK) signals from Reflective Semiconductor Optical Amplifiers (RSOAs), overcoming waveform distortions for faster passive optical networks.

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    Area of Science:

    • Optical Communications
    • Semiconductor Devices
    • Signal Processing

    Background:

    • High-speed upstream transmission in coherent wavelength-division-multiplexed passive optical networks (WDM-PONs) relies on Reflective Semiconductor Optical Amplifiers (RSOAs).
    • Accurate carrier phase estimation (CPE) is crucial for retrieving phase-modulated information from RSOA-generated signals.
    • Limited modulation bandwidth of RSOAs causes severe waveform distortions, hindering existing CPE algorithms for high-speed Quadrature Phase-Shift Keying (QPSK) signals.

    Purpose of the Study:

    • To propose a novel CPE method for accurately estimating the carrier phase of high-speed QPSK signals from RSOAs.
    • To enable rapid carrier phase tracking using a minimal number of symbols, even with significant waveform distortions.
    • To demonstrate the effectiveness of the proposed CPE method in a practical WDM-PON scenario.

    Main Methods:

    • Developed a novel CPE algorithm leveraging the inherent linear relationship between intensity and phase modulation indices in semiconductor opto-electronic devices.
    • Utilized a small number of symbols (15) for rapid carrier phase tracking, accommodating limited RSOA modulation bandwidth.
    • Employed a commercial distributed-feedback (DFB) laser with a 3 MHz linewidth as the seed light source.

    Main Results:

    • Successfully demonstrated the transmission of a 25.78-Gb/s QPSK signal over a 20-km loopback fiber link.
    • The proposed CPE method accurately estimated carrier phase despite severe waveform distortions from the RSOA's limited modulation bandwidth.
    • The method exhibited high robustness against variations in key parameters, including test phases, linewidth enhancement factor, and DC component amplitude.

    Conclusions:

    • The novel CPE method effectively overcomes the limitations of RSOA bandwidth in high-speed coherent WDM-PONs.
    • This approach enables reliable upstream QPSK signal transmission at 25.78 Gb/s using standard DFB lasers.
    • The proposed technique offers a practical solution for advancing high-speed optical communication systems.