High speed led optical communication modulator

An optical communication and modulator technology, applied in the field of high-speed LED optical communication modulators, can solve the problems of long carrier annihilation time, poor optical communication effect, and low carrier recombination rate

Active Publication Date: 2017-06-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LED is connected in series with a switch for simple modulation. The disadvantage is 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.

Method used

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  • High speed led optical communication modulator
  • High speed led optical communication modulator
  • High speed led optical communication modulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see figure 2 , the high-speed LED optical communication modulator includes LED, control unit and variable power supply unit; the variable power supply unit is an energy supply unit capable of switching positive and negative directions; the control unit generates switches and timing control signals to drive The variable power supply unit supplies power to the LED; the timing control signal is used to reduce energy band bending through timing control to improve carrier radiative recombination; when the variable power supply unit supplies power forward, the LED is turned on, and the carrier Over-injection; when the variable power supply unit reverses the power supply, the LED is turned off, and at the same time the carrier is reversely injected; the reverse power supply is not loaded during the entire shutdown process but only for a short period of time to avoid the energy band bending. The resulting radiative recombination rate is greatly reduced, thereby increasing the ...

Embodiment 2

[0037] see image 3 The variable power supply unit of the high-speed LED optical communication modulator includes a power supply unit, a switch K101, a switch K102, a switch K103 and a switch K104; the power supply unit includes a voltage limiting constant current control unit; the control unit is used to generate and output The control signal of the switch and realize the sequence control; the control of the sequence controls the reverse power supply time by monitoring the reverse current of the LED; the voltage limiting constant current control unit, the switch K101, the LED and the switch K102 are sequentially connected in series to form a loop; the The end of the switch K102 away from the cathode of the LED is grounded; one end of the switch K104 is connected to the anode of the LED, and the other end is grounded; one end of the switch K103 is connected to the cathode of the LED, and the other end is connected to the positive pole of the voltage limiting constant current co...

Embodiment 3

[0043] see Figure 4 The variable power supply unit of the high-speed LED optical communication modulator includes a power supply unit, a switch K101, a switch K102, a switch K103, a switch K104, and a switch K105; the power supply unit includes a voltage limiting and constant current control unit; the control unit is used for Generate and output the control signal of the switch and realize the timing control; the timing control controls the reverse power supply time by monitoring the reverse current of the LED; the voltage limiting constant current control unit, the switch K101, the LED and the switch K102 are sequentially connected in series to form a loop The end of the switch K102 away from the cathode of the LED is grounded; one end of the switch K104 is connected to the anode of the LED, and the other end is grounded; one end of the switch K103 is connected to the cathode of the LED, and the other end is connected to the positive pole of the voltage limiting constant curr...

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Abstract

The invention discloses a high-speed LED optical communication modulator. The high-speed LED optical communication modulator comprises a control unit and a variable power supply unit; the variable power supply unit is an energy supply unit capable of switching in the positive and negative directions; the control unit generates switching and sequential control signals so that the variable power supply unit is driven to supply power to an LED; the sequential control signals are used for reducing the bending of an energy band via sequential control so that radiative recombination of carriers is improved; when the variable power supply supplies power in the positive direction, the LED is turned on, and the carriers are over-injected; and when the variable power supply supplies power in the reverse direction, the LED is turned off, and the carriers are injected in a reverse manner. The high-speed LED optical communication modulator also comprises a discharge circuit used for further accelerating the turn-off. According to the high-speed LED optical communication modulator, the over-injection of the carriers during turn-on and reverse injection of the carriers during turn-off are controlled so that the recombination rate of the carriers is increased, and the switching speed is greatly increased; the turn-off is further accelerated via the auxiliary discharge circuit; and the bending of the energy band is reduced via sequential control, and the radiative recombination of the carriers is improved.

Description

technical field [0001] The invention relates to an optical communication modulator, in particular to a high-speed LED optical communication modulator. Background technique [0002] Optical communication is to achieve ultra-high-speed optical switching rate, rather than high-speed switching in common circuits. The emphasis here is on the switching rate of light, not the switching rate of electrons or holes; optical communication is used to supplement wireless communication applications such as WIFI Insufficient, in some areas to replace WIFI has become a new way of communication. 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. LEDs are connected in series with a switch for simple modulation. The disadvantages are that the switching speed is severely li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/50H05B37/02
CPCH04B10/116H04B10/50H05B47/10Y02B20/40
Inventor 陈敦军雷建明谢自力张荣郑有炓
Owner NANJING UNIV
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