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Few mode fiber (FMF) has attracted significant research interest owing to its unique possibility for exploration in a new dimension. In this paper, we review our recent progress in FMF-based optical sensors for single-(absolute) and multi-parameter sensing.
Few-mode fiber (FMF) has recently attracted much interest due to the additional freedom in the spatial domain. In this talk, we report our recent progress on FMF based optical sensors. We show two types of FMF sensor, and then demonstrate the potential of multi-parameter sensing.
We experimentally characterize a two-mode fiber (TMF) based intermodal interferometer sensor for temperature and strain. A wavelength-temperature coefficient of −43 pm/°C and wavelength-strain coefficient of −2.3 pm/με have been measured.
We propose a novel method for distributed measurement of temperature and strain using a few-mode fiber (FMF). High discrimination accuracies of 0.115 oC and 0.283 με are achieved, under a spatial resolution of 2.5 m.
We investigate the optimal carrier-to-sideband-ratio (CSR) for optical double-sideband (DSB) signals, and experimentally demonstrate that pre-distorted DSB has 1.2dB sensitivity advantage over single sideband both with optimal CSR in a 12GHz 29km radio-over-fiber transmission.
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