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Visible light communication led light source with adjustable modulation bandwidth

A technology of visible light communication and LED light source, which is applied in the field of visible light communication, can solve the problems of modulation bandwidth and luminous efficiency attenuation, unsatisfactory practicability, and weakening of the equalization effect of LED devices, so as to improve communication quality, low production cost, and regulate modulation bandwidth Effect

Active Publication Date: 2019-08-13
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

In addition, the modulation bandwidth and luminous efficiency of the LED device itself are not constant. As the use time increases and the use environment deteriorates, the modulation bandwidth and luminous efficiency of the LED device will gradually decay, and the equalization effect of the module on the LED device will also weaken.
Therefore, the practicality of this method is not ideal in the case of prolonged use or extreme environment use

Method used

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  • Visible light communication led light source with adjustable modulation bandwidth

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Embodiment Construction

[0016] see figure 1 As shown, the present invention provides a visible light communication LED light source with adjustable modulation bandwidth, including:

[0017] An LED device 1 for visible light communication is a light-emitting diode based on GaN or GaAs material, its electrical structure is forward p-type-MQW-n type, and its packaging structure is a flip-chip structure, a front-mount structure or a vertical structure.

[0018] A DC blocking capacitor 2, whose capacitance is higher than 10pF, is used to block the constant current driving the LED device 1 from passing through, so as to avoid the DC loss caused by the parallel circuit.

[0019] An adjustable resistor 3 is a SMD or in-line potentiometer, and its function is to change the transmission characteristics of the LED device 1 to realize the adjustable balanced bandwidth.

[0020] Wherein the DC blocking capacitor 2 is connected in series with the adjustable resistor 3, the DC blocking capacitor 2 and the adjustab...

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Abstract

A visible light communication LED light source with adjustable modulation bandwidth, comprising: an LED device for visible light communication, a DC blocking capacitor and an adjustable resistor; wherein the DC blocking capacitor is connected in series with the adjustable resistor, and the DC blocking capacitor and the adjustable resistor are connected to the The LED devices are connected in parallel, the positive pole of the LED device and one end of the DC blocking capacitor are input terminals, and the negative pole of the LED device and one end of the adjustable resistor are output terminals. The invention can adapt to LED devices with different bandwidths and different impedance characteristics, and improves the communication quality of visible light communication light sources in extreme environments.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and in particular relates to a visible light communication LED light source with adjustable modulation bandwidth. Background technique [0002] Visible light communication has the remarkable characteristics of high transmission rate, no electromagnetic radiation, low energy consumption, rich spectrum, and high confidentiality, and has become a hot spot for short-distance free space communication. Visible light communication light source is one of the keys to the communication system, and its role is to convert electrical signals carrying specific information into optical signals without electromagnetic radiation pollution. The visible light communication LED light source of the present invention uses LED devices based on GaN or GaAs materials, while commercial GaN or GaAs-based LEDs are affected by the RC time and carrier life of the device itself, and the available modulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H04B10/116H04B10/50H05B44/00
CPCH04B10/116H04B10/502H05B44/00Y02B20/30
Inventor 曹海城杨超朱石超林杉赵丽霞
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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