KEYWORDS: Optical fibers, Analog electronics, Digital signal processing, Data transmission, Temperature metrology, Optoelectronics, Manufacturing, Signal processing, Nonlinear optics
In the context of Industry 4.0, a new concept called “smart oilfield” is introduced, which relies on large-scale information exchange among various parts and there is an urgent need for special fiber links for both increased data transmission capacity and high-sensitivity distributed sensing. Naturally, multicore fibers can be expected to play a critical role in smart oilfields, in which part of cores are responsible for data transmission, while other ones are used for sensing. In this paper, we propose a heterogeneously integrated seven-core fiber for interconnection and awareness applications in smart oilfields, which not only could support digital and analog signal transmission, but also could measure temperature and vibration through Raman effect and phase-sensitive optical time-domain reflectometry. The core arranged in the center is used for digital transmission to maintain communication stability, while others are arranged around the center for analog transmission and sensing with equal pitches to increase sensing sensitivity. The core for digital signal transmission has low differential mode group delay of 10 ps/km over C-band and the crosstalk between adjacent cores is lower than -55 dB/km at the pitch of 50 μm. A 25-Gbaud real-time transmission over 50 km is simulated as a proof of concept. Each core for analog signal transmission has a large effective area of 172 μm2 to suppress the nonlinear effect due to the watt-scale input power. In all, the proposed heterogeneously integrated multicore fiber exhibits great potential to be applied in smart oilfields, meeting the demand for efficient and cost-effective oil production.
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