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Multiplication-free and hardware-efficient baud-rate timing error detector for Nyquist and faster than Nyquist
Optics Letters
|May 1, 2024
Summary
This study introduces a novel, hardware-efficient timing error detector (TED) for clock recovery (CR) in optical systems. The multiplication-free TED achieves high-speed synchronization with minimal resources, outperforming existing solutions.
Area of Science:
- Optical communications
- Digital signal processing
- VLSI design
Background:
- High baud rates and advanced modulation formats are essential for short-distance optical interconnections.
- Existing clock recovery (CR) algorithms often require significant computing resources and power.
- Bandwidth limitations in Nyquist and faster than Nyquist (FTN) systems can degrade clock tone, complicating CR.
Purpose of the Study:
- To propose a hardware-efficient, multiplication-free baud-rate timing error detector (TED) for ultrahigh-speed optical interconnections.
- To address the need for CR algorithms that operate at higher baud rates with minimal computational overhead and power consumption.
- To enhance CR performance in bandwidth-limited systems, including Nyquist and FTN signaling.
Main Methods:
- Developed a novel baud-rate timing error detector (TED) that avoids multiplication operations.
- Employed the absolute value of samples and a nonlinear sign operation to enhance the clock tone.
- Experimentally validated the proposed TED using a transceiver system with a 30 GHz 3 dB bandwidth.
Main Results:
- The proposed baud-rate TED demonstrated excellent performance in experimental investigations.
- Achieved successful clock synchronization for various high-speed signals: 50 GBaud PAM4/8, 80 GBaud PAM4, and up to 120 GBaud PAM4 FTN.
- The CR scheme based on the proposed TED is considered optimal for ultrahigh-speed short-reach intensity modulation/direct detection (IM/DD) transmission.
Conclusions:
- The developed multiplication-free, hardware-efficient TED is a highly effective solution for clock recovery in demanding optical communication systems.
- The proposed CR approach offers a superior balance of timing jitter, bit error rate (BER), and implementation complexity for ultrahigh-speed short-reach IM/DD.
- This innovation meets the critical need for low-power, high-performance CR in next-generation optical interconnections.
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