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This research aims to develop a fully softwarized coherent receiver DSP stack using a GPU platform to enhance timing and clock recovery.

May 4, 2026Open Access

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First Real‐Time Softwarization of Complete Coherent DSP Stack with Gardner Timing and Clock Recovery

SKSang‐Yuep Kim TST. SuzukiNTT (Japan)JKJun‐ichi KaniNTT (Japan)

Key Points

This research aims to develop a fully softwarized coherent receiver DSP stack using a GPU platform to enhance timing and clock recovery.
Implemented a data-parallel GPU system for Gardner-based timing and clock recovery.
Conducted an 80-km transmission experiment using 5-Gbit/s DP-QPSK signals.
Measured performance in terms of bit error rate sensitivity.
Achieved real-time operation without an external clock reference.
Demonstrated approximately 1-dB sensitivity penalty at a target bit error rate of 10−3 during transmissions.

Abstract

ABSTRACT This work demonstrates the first fully softwarized coherent receiver digital signal processing stack implemented on a general‐purpose graphic processing unit (GPU) platform. By introducing a data‐parallel GPU implementation for Gardner‐based timing and clock recovery (TCR), the system achieves complete real‐time receiver operation without requiring an external clock reference. The 80‐km transmission experiment on 5‐Gbit/s dual‐polarization quadrature phase shift keying (DP‐QPSK) signals resulted in an approximately 1‐dB sensitivity penalty at a target bit error rate of 10 −3 .

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First Real‐Time Softwarization of Complete Coherent DSP Stack with Gardner Timing and Clock Recovery

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Abstract

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