Abstract: A semitransparent photovoltaic device comprising: a plurality of active photovoltaic areas including a transparent substrate, a front electrode, an absorber including one or more thin photoactive layers, and a rear electrode; a transparency area separating at least two of the active photovoltaic areas; and a collection grid. The collection grid includes a metallic contact layer and a plurality of VIAs between the front electrode and the metallic contact layer, wherein the VIAs are randomly distributed within the active photovoltaic area.

Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximise the signal-to-noise ratio of the electrical signal by minimising distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximising the level of the modulated electrical signal and the throughput of transmitted data.

Abstract: A coded-light communication device is described, in which the communication has an initial signal-to-noise ratio, which varies according to the lighting conditions. The device comprises at least one photodetector-type light receiver comprising an anode and a cathode and having an initial shunt resistance. The receiver is capable of being simultaneously exposed to a coded light source carrying a signal and a non-coded light source. The anode and cathode are short-circuited by at least one short-circuit resistance arranged inside the photodetector, having a value selected so that the new value of the shunt resistance of the photodetector resulting from the connection of the initial shunt resistance and the short-circuit resistance gives the communication device a new resultant signal-to-noise ratio which remains substantially independent of the intensity of the non-coded light.

Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector.

Abstract: The invention relates to a wireless communication device which uses light, comprising at least: a light source emitting a modulated light signal; a photovoltaic module capable of receiving said modulated light signal; and an analog-to-digital converter electrically connected to the output terminals of said photovoltaic module, making it possible to convert the analog signal output by the photovoltaic module into a digital signal; characterised in that it also comprises a means for polarising said photovoltaic module making it possible to generate a polarisation voltage applied to the terminals of said photovoltaic module, and a management module capable of optimising said polarisation voltage into a threshold voltage corresponding to an improved signal-to-noise ratio and communication bandwidth.

Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximize the signal-to-noise ratio of the electrical signal by minimizing distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximizing the level of the modulated electrical signal and the throughput of transmitted data.

Abstract: A coded-light communication device is described, in which the communication has an initial signal-to-noise ratio, which varies according to the lighting conditions. The device comprises at least one photodetector-type light receiver comprising an anode and a cathode and having an initial shunt resistance. The receiver is capable of being simultaneously exposed to a coded light source carrying a signal and a non-coded light source. The anode and cathode are short-circuited by at least one short-circuit resistance arranged inside the photodetector, having a value selected so that the new value of the shunt resistance of the photodetector resulting from the connection of the initial shunt resistance and the short-circuit resistance gives the communication device a new resultant signal-to-noise ratio which remains substantially independent of the intensity of the non-coded light.

Abstract: The invention relates to a wireless communication device which uses light, comprising at least: a light source emitting a modulated light signal; a photovoltaic module capable of receiving said modulated light signal; and an analog-to-digital converter electrically connected to the output terminals of said photovoltaic module, making it possible to convert the analog signal output by the photovoltaic module into a digital signal; characterised in that it also comprises a means for polarising said photovoltaic module making it possible to generate a polarisation voltage applied to the terminals of said photovoltaic module, and a management module capable of optimising said polarisation voltage into a threshold voltage corresponding to an improved signal-to-noise ratio and communication bandwidth.

Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximise the signal-to-noise ratio of the electrical signal by minimising distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximising the level of the modulated electrical signal and the throughput of transmitted data.

Abstract: The invention relates to a method for optimizing the data rate, in a wireless communication system comprising a LED forming an emitting device, and a photodetector forming a receiving device. For a given value of a DC component of the supply signal of the LED, the modulation amplitude of an AC component of this supply signal is adjusted step by step, so as to improve the transmission quality of the signal provided by the LED and received by the photodetector. The invention also relates to an optimization module implementing such a method. Alternatively, the modulation amplitude of the AC component of the supply signal is set, and the value of the DC component is adjusted step by step.

Abstract: The invention relates to a method for optimizing the data rate, in a wireless communication system comprising a LED forming an emitting device, and a photodetector forming a receiving device. For a given value of a DC component of the supply signal of the LED, the modulation amplitude of an AC component of this supply signal is adjusted step by step, so as to improve the transmission quality of the signal provided by the LED and received by the photodetector. The invention also relates to an optimization module implementing such a method. Alternatively, the modulation amplitude of the AC component of the supply signal is set, and the value of the DC component is adjusted step by step.

Abstract: One aspect of the invention relates to an optical security component (10) comprising at least one diffractive element (7) formed by at least one annular diffractive grating (111, 113, 115, 117, 131, 133, 135) characterized by a minimum radius (Rmin), a maximum radius (Rmax) and a period (d). According to the invention, using a polychromatic light-emitting object, the aforementioned diffractive element can form a plurality of images at different observation distances from the component, the spectral characteristics of said images varying as a function of the observation distance from the component.