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Updated: May 3, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Vibration detection based on DSP frame pilot symbols using integrated coherent receivers
Abstract:
We propose a vibration detection scheme that directly utilizes integrated coherent receivers and leverages pilot symbols (PS) consistent with implementation agreements (IAs)-defined digital signal processing (DSP) frame. By applying a low-complexity sliding filter and an averaging operation to the phase tracked by the widely and commercially used PS-based carrier phase recovery algorithm, the external-cavity lasers (ECLs)-induced phase noise is effectively suppressed. Simulations demonstrated the accurate retrieval of vibrations across the frequency range of 10-40 kHz, with a linearity of R2=0.9998 and a sensitivity of 0.04 rad. Experimental validation in a 60-GBaud dual-polarization 16-quadrature amplitude modulation (DP-16QAM) system yielded a sensing signal-to-noise ratio (SSNR) of 23.9 dB for a ∼5.5-rad vibration at 60 kHz, achieving a sensitivity of 0.09 rad. This scheme offers a robust solution for integrated sensing in future intelligent optical networks.
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