High speed led optical communication bridge modulator

Abstract

The invention discloses a high-speed LED optical communication bridge-type modulator, and the modulator comprises a power supply unit, an LED, a switch K101, a switch K102, a switch K103, a switch K104, a switch K105, a control unit, a voltage-limiting constant current control unit, and a constant voltage control unit. The switches K101 and K102 are connected, and the switches K103, K104 and K105 are disconnected. The forwarding power supply of the LED is carried out, thereby enabling the LED to be quickly overshot and connected. The switches K103 and K104 are connected, and the switches K101, K102 and K105 are disconnected. The reverse power supply of the LED is carried out, thereby enabling the LED to be quickly turned off. The control of time sequence controls the time of reverse power supply through the monitoring of a reverse current of the LED, and the reverse power supply is not carried out in the whole disconnection process but in a small time period, so as to prevent band bending from causing the great decrease of radiative recombination rate, and improving the disconnection speed of light. The switch K105 is connected, and the switches K101, K102, K103 and K104 are disconnected. The switch K105 is a discharge circuit which aims at speeding up the recombination of residual carriers of the LED, and controls the forwarding unidirectional discharge of the LED. The modulator improves the recombination speed of carriers, and is high in switching speed.

Description

technical field [0001] The invention relates to an LED modulator, in particular to a high-speed LED optical communication bridge modulator. Background technique [0002] Optical communication is to achieve ultra-high-speed optical switching rate, not the electrical high-speed switching in common circuits. The emphasis here is on the switching rate of light, not simply the switching rate of electrons or holes. Optical communication is used to supplement the shortcomings of wireless communication applications such as WIFI, and replace WIFI in some fields to become a new communication method. LED optical communication technology is a brand-new communication technology that has gradually developed in recent years. Many related technical researches are still in their infancy, especially in the technology of high-speed LED devices and high-speed switching circuits. The existing LEDs are connected in series with a switch for simple modulation. The disadvantages are that the switch...

AI Technical Summary

Problems solved by technology

The existing LEDs are connected in series with a switch for simple modulation. The disadvantages are that the switching speed is severely limited, the carrier recombination rate is not high, and the remaining carrier annihilation time is too long, which makes the optical communication effect very poor.

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