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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Efficient preamble scheme for burst-mode detection in coherent TFDM-PON.
Optics Express
|February 20, 2026
Summary
This study introduces an efficient upstream scheme and preamble design for coherent time and frequency division multiplexing passive optical networks (TFDM PONs). The innovation accelerates digital signal processing convergence, enabling higher bandwidth and lower latency in future optical networks.
Area of Science:
- Optical communication networks
- Telecommunications engineering
- Signal processing
Background:
- Coherent technology is crucial for future passive optical networks (PONs) demanding higher bandwidth.
- Time and Frequency Division Multiplexing (TFDM) PONs offer flexible bandwidth and low latency but face upstream burst-mode detection challenges.
Purpose of the Study:
- To propose an efficient upstream system scheme and preamble design for coherent TFDM PONs.
- To accelerate digital signal processing (DSP) convergence with a minimal preamble length.
Main Methods:
- A scheme using single-polarization, residual carrier modulation, and specialized spectrum allocation.
- An integrated preamble design for frame synchronization, frequency offset estimation (FOE), polarization compensation, and channel estimation.
Main Results:
- Experimental verification of a 200-Gb/s TFDM upstream transmission over 20-km standard single-mode fiber (SSMF).
- Achieved receiver sensitivity of approximately -27 dBm at a 1 × 10-2 BER threshold using a 20.48-ns preamble with 256 training symbols (TS).
Conclusions:
- The proposed scheme and preamble design effectively address upstream burst-mode detection challenges in coherent TFDM PONs.
- The integrated preamble significantly reduces length, enabling faster DSP convergence and improved system performance.
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