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Vibration detection based on DSP frame pilot symbols using integrated coherent receivers.
Optics Letters
|May 1, 2026
Summary
This study introduces a novel vibration detection method using integrated coherent receivers and pilot symbols (PS). The technique effectively suppresses laser phase noise, enabling accurate vibration sensing for intelligent optical networks.
Area of Science:
- Optical communications
- Integrated photonics
- Sensing technologies
Background:
- External-cavity lasers (ECLs) introduce phase noise in optical systems.
- Accurate vibration detection is crucial for intelligent optical networks.
- Pilot symbol (PS)-based carrier phase recovery is a standard technique.
Purpose of the Study:
- To propose a vibration detection scheme utilizing integrated coherent receivers.
- To suppress external-cavity laser (ECL)-induced phase noise.
- To enable robust integrated sensing in optical networks.
Main Methods:
- Utilizing integrated coherent receivers and pilot symbols (PS).
- Applying a low-complexity sliding filter and averaging to phase-tracked data.
- Leveraging digital signal processing (DSP) frame conventions.
Main Results:
- Simulations showed accurate vibration retrieval (10-40 kHz) with R²=0.9998 and 0.04 rad sensitivity.
- Experimental validation in a 60-GBaud DP-16QAM system achieved 23.9 dB SSNR for a 5.5-rad vibration at 60 kHz.
- Demonstrated a sensitivity of 0.09 rad in experimental validation.
Conclusions:
- The proposed scheme effectively suppresses phase noise for vibration detection.
- This method provides a robust solution for integrated sensing in future optical networks.
- The technique is compatible with existing digital signal processing (DSP) frameworks.
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