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We present a search-algorithm for the construction of optical orthogonal codes (OOCs) to be used in OWLS (Optical Wireless Links for intra-Spacecraft communications) systems. It is based on trial-and-error search, but a special effort is done in reducing the size of the initial set of sequences that are candidates to be part of the desired code. The approach for identifying that initial set of candidates...
Intelligent and Customizable Units for Education (ICUE) is a triple — hardware, software and document — open platform for engineering student laboratories. Its main features are flexibility and low cost. In its origin is intended for Optical Communications, but it can be adapted to other areas. The platform includes one management unit, several specific modules, and two communication networks: management...
This paper proposes a low cost and complexity indoor location and navigation system using visible light communications and a mobile device. LED lamps work as beacons transmitting an identifier code so a mobile device can know its location. Experimental designs for transmitter and receiver interfaces are presented and potential applications are discussed.
In this paper, the use of visible light communications (VLC) technologies for providing data networking for passengers during flight is explored. An uplink channel based on infrared is also studied. The potential capabilities of this optical access technique are examined.
Advances in solid-state lighting have overcome common limitations on optical wireless such as power needs due to light dispersion. It's been recently proposed the modification of lamp's drivers to take advantages of its switching behaviour to include data links maintaining the illumination control they provide. In this paper, a remote access application using visible light communications is presented...
An infrared optical wireless system is presented, consisting on autonomous remote nodes communicating with a central node. The network is designed for telecommand/telemetry purposes, comprising a large number of nodes at a low data rate. Simultaneous access is granted by using CDMA techniques, and an appropriate selection of the code family can also keep power consumption to a minimum.
We report on short optical pulse generation by gain-switching (GS) a low-cost commercial vertical-cavity surface-emitting laser emitting at 1.55 μm. The dependence of pulse characteristics on GS parameters is investigated and analyzed. Pulses with duration of 55 ps and time-bandwidth product between 0.91 and 2.2 are obtained at repetition rates between 1 and 3 GHz.
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