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The wavefront compensation effect of the micro corner-cube-reflector arrays (MCCRAs) in modulating retroreflector (MRR) free-space optical (FSO) link is investigated by wave-optics (WO) simulation method that is based on the split-step beam propagation method and phase screen theory. Two kinds of the MCCRAs with the cell's apertures of the triangle and hexagon are considered with the aid of the numerical...
Visible light communication (VLC) using light emitted diodes (LEDs) has been considered as the most attractive solution for indoor positioning. In this paper, an indoor visible light positioning system taking account of multiple reflections is investigated. Based on received signal strength indication (RSSI) algorithm, the positioning error distributions are simulated and show that the reflections...
We present a method to produce continuous, fast and truly-linear frequency-sweep optical signal driven by arbitrary waveform generator. By using this signal as the optical source, a high-repetition-rate optical frequency domain reflectometry is experimentally demonstrated with linear response to outside perturbation. This work has significant value for achieving high performance distributed acoustic...
The way of using Modulating Retro-Reflector (MRR) to communicate is appealing. However, in the long-range MRR communication system, the retro-reflective signal which falls off as 1/R4 is weak and difficult to be detected. In this manuscript, A novel detection mode of MRR communication based on speckle technology is proposed, which can detect small fluctuation of the light from the modulator. The novel...
We investigate and analyze the asymmetrically clipped and direct-current-biased optical orthogonal frequency division multiplexing (ADO-OFDM) in visible light communication (VLC) system. Then we propose two modified channel equalization algorithms of ADO-OFDM in VLC systems. It is shown that the algorithm combined with channel estimation for interference cancellation to recover ADO-OFDM signal is...
Recently, Φ-OTDR based on optical I/Q demodulation has been proposed as a promising solution for distributed acoustic sensing. This paper characterizes the imbalance of coherent-receiver optical front-end, and analyses its impact on phase demodulation in Φ-OTDR with coherent detection.
In this paper, a new structure of optical add-drop multiplexer based on cascaded phase shifted linearly chirped fiber Bragg grating (CPSLCFBG) and Mach-Zehnder Interferometer (MZI) is proposed. The spectrum of drop port and output port of the OADM is analyzed using transmission matrix method by optimizing of CPSLCFBG with Cap apodization function. At the port of the drop and the output, which has...
An optical power meter is used to monitor the reflected light of the fiber-end to control the whole coating process based on the research of optically driven position. The coating of graphene oxide (GO) is mainly divided into fiber end face. The film's uniformity is investigated by changing the coating time, the incident light power and the depth of the immersion in the solution. An optical fiber...
In this paper, we present a novel channel model for indoor visible light communication (VLC) system with specular reflection. In contrast to the previous indoor visible light communication simulation models, our model is not restricted to diffuse reflection, with specular reflection considered. The simulation environment is set up in MATLAB and our model is capable of obtaining several channel characteristics...
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