Abstract
Beam tracking-and-steering is crucial for the operation of high-speed, narrow beam, optical wireless communication (OWC) systems. Using a system based on two sets of low-cost cameras for continuous beam tracking and a set of mirrors for steering, we demonstrate here a high-capacity (>1Tbit/s) ten-channel wavelength-division multiplexed (WDM) OWC system based on discrete multitone transmission. The results, which are achieved over a 3.5-m perpendicular distance and across a lateral coverage up to 1.8 m, constitute to the best of our knowledge, the highest aggregate OWC capacity at this coverage.
Highlights
The ever growing use of multimedia devices supporting bandwidth-hungry applications has contributed to an exponential increase in the wireless data traffic in recent years [1,2,3]
The optical signal at the Tx passes through an optical fiber collimator (Col1, Thorlabs TC06APC-1550), followed by a beam splitter, which is composed of a dichroic filter (DF) and a bandpass filter (BF)
We first evaluated the wavelength-division multiplexed (WDM) Optical wireless communications (OWC) system using the 8QAM DDO-OFDM (98.4375 Gb/s per channel) when the Tx and Rx were vertically aligned, i.e., the lateral distance shown in Fig. 1(c) was 0 m
Summary
The ever growing use of multimedia devices supporting bandwidth-hungry applications has contributed to an exponential increase in the wireless data traffic in recent years [1,2,3]. Optical wireless communications (OWC), featuring the benefits of an unregulated wide bandwidth, immunity to electromagnetic interference and much higher achievable data rates than RF, is a promising candidate for both indoor and outdoor high-speed wireless access [1,2,3]. Narrow-beam infrared OWC can offer a much higher achievable capacity by using fiber-optic devices in the fiber telecom-band. Eye safety regulations restrict the maximum permissible emitted power at the transmitter (e.g. below 10 dBm for 1550 nm), according to the International Electrotechnical Commission Standard [13] For these reasons, sensitive beam tracking and steering systems are of great importance in infrared OWC systems
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