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In this paper, a solar panel utilized as a photodetector with simultaneous energy harvesting is proposed in visible light communication (VLC). The solar cell is a self-styled passive device, which can convert optical signals into electrical signals. The generated energy can potentially be used to power user terminals or at least to prolong operation time. This work is an important step towards the...
A pulse amplitude modulation with 4 levels (PAM-4), generated by optical superimposition, is first proposed and experimentally demonstrated for visible light communication (VLC). It can overcome the shortcomings of the PAM-4 signals generated in the electrical domain, with enhanced tolerance to the modulation nonlinearities of a light emitting diode (LED). A proof-of-concept experiment employing two...
In this paper, we propose a scheme using Orthogonal Frequency Division Multiplexing (OFDM) and self-coherent detection to enhance satellite-to-ground data links, with improved communication data rate and detection performance. We analyzed this free space optical communication systems theoretically, with preliminary experimental results being demonstrated. In the experiment, quadrature phase shift...
We propose and demonstrate a simple chirp-free optical Manchester signal transmitter that consists of a single-drive Mach-Zehnder modulator and a passive electronic power combiner. A 5-Gb/s optical Manchester signal is generated and its dispersion tolerance enhancement is investigated. The bandwidth of the modulator and driving circuit is reduced by half.
Downstream RZ-shaped phase modulation is used in single feeder-fiber, re-modulation-based 10-Gb/s WDM-PONs to achieve high extinction-ratio in both downstream/upstream signals. The ONU's delay-interferometer can demodulate downstream signal and simultaneously generate a source for upstream-re-modulation.
We propose and experimentally demonstrate a simple power efficient scheme for WDM-PON, using a LED-based monitoring signal to save the power consumption of the optical transceivers for the inactive subscribers.
We propose and demonstrate optical multicast overlay on WDM-PON employing bandwidth efficient Inverse-RZ-duobinary signal. Multicast overlay control is realized by tuning the bias at the point-to-point downstream modulator at the OLT.
We demonstrate error free, low-penalty demultiplexing of a 640 Gbit/s OTDM signal to 10 Gbit/s using a 5 cm long chalcogenide planar waveguide chip. Our approach exploits four-wave mixing by the instantaneous nonlinear response of chalcogenide.
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