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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...
We experimentally demonstrate an underwater wireless optical communication (UWOC) with 1.4-Gbaud 16-QAM signal using Gaussian mode, orbital angular momentum (OAM) mode and Bessel mode at the wavelength of 532 nm. Underwater bubbles effect is also studied and the BER performance is measured.
We demonstrate an underwater wireless optical transmission link by employing 4-fold orbital angular momentum (OAM) multicasting. The OAM spectrum degradation and crosstalk between multicasted OAM channels and their neighboring ones after 2-m underwater propagation are studied.
Compared with the well-established techniques for underwater acoustic communication, underwater wireless optical communication provides much higher transmission bandwidth and can be an interesting alternative in short range underwater applications. We experimentally investigated the feasibility of using a directly modulated semiconductor laser as the transmitter in an underwater wireless optical communication...
Atmospheric turbulence is a main limiting factor to the application of wireless laser communication in marine environment, which causes intensity variation and wavefront aberration in the laser beam. Characterizing the wavefront aberration of the laser beam is an important step for mitigating the effect of turbulence. In this paper, we focus on measurement and analysis of wavefront aberration in laser...
A 70-km-reach bi-directional WDM-PON with 10-Gb/s downstream Manchester-duobinary signal and 1.25-Gb/s upstream re-modulated NRZ-OOK signals is demonstrated, with effective mitigation of Rayleigh backscattered noise.
We generate 20-Gb/s return-to-zero differential quadrature phase-shift-keying (RZ-DQPSK) signal using a directly modulated chirp managed laser (CML), without requiring any differential encoder and optical phase modulator.
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.
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.
An all-optical minterm generator for three-input NRZ-DPSK signals is proposed and demonstrated based on SOAs and delay interferometers. Results are derived in OOK format. Experiment with two DPSK inputs is also carried out for comparison.
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