Abstract
In this paper, we introduce a novel concept and design of a full-duplex and all-optical FSO transceiver and evaluate its transmission performance in 200 m outdoor environment. Our transceiver enables a reliable fiber-to-fiber FSO link with intelligent lens-based optical-beam-stabilization (OBS) by utilizing miniaturized and cost-effective 3-axis voice-coil motors (VCMs) actuators. The VCM-based moving lens that is widely used in smartphone cameras for auto-focus and optical-image-stabilization is customized and optimized for our designed transceiver to expand the transmitter and receiver field-of-view, control both the transmitted and incident laser beam alignment, suppress the effects of random beam angle-of-arrival fluctuations induced by the atmospheric turbulence and pointing errors and maintain efficient direct coupling to the fiber core at the receiver. Unlike the 2-axis fast-steering-mirrors, the use of 3-axis VCM lenses can not only maintain the beam alignment, but also control the beam collimation and adjust the difference between the lens focal plane and projection plane for a higher fiber coupling efficiency. Using our developed FSO transceivers, we demonstrate an error-free transmission of the standard signals 10 GbE LAN and common public radio interface (LTE-CPRI) over 200 m links. We also performed a continuous 24-h transmission evaluation in a clear weather day, with only occasional burst errors were recorded and a total 24-h BER of 3 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\times 10^{-10}$</tex-math></inline-formula> . The obtained results demonstrate the potential of our proposed FSO transceiver to ensure high-capacity communication links and facilitate the adoption of the FSO system as a viable candidate to address the main requirements of B5G/6G networks.
Highlights
W ITH the ever-increasing of global mobile data traffic, there is a consensus that 5G/6G networks will enable faster data speeds, higher capacity, lower latency, and massive connectivity [1]
Unlike the existing free-space optics (FSO) system that is based on 2-axis Fast steering mirror (FSM) technology, we propose to utilize a miniaturized cost-effective 3-axis voice-coil motors (VCMs)-based movable lens [23], [24]
All-optical FSO system will be compatible with the high capacity analog radio-over fiber system which is considered as a potential candidate for B5G/6G networks [28]–[30]
Summary
W ITH the ever-increasing of global mobile data traffic, there is a consensus that 5G/6G networks will enable faster data speeds, higher capacity, lower latency, and massive connectivity [1]. Unlike the existing FSO system that is based on 2-axis FSM technology, we propose to utilize a miniaturized cost-effective 3-axis voice-coil motors (VCMs)-based movable lens [23], [24] Using this technology, we can implement the tracking module with a similar performance to the FSM, but with a simpler optical path design, especially when used for fiber coupling. To enable full-duplex transmission, we developed for the first-time an polarization-independent free space-based optical circulator (FSO-C) which can ensure similar flexibility as the binocular transceiver, so that the transmitted and received beams can be controlled efficiently and independently.
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