CN111404604A - A mid-infrared communication device - Google Patents

Abstract

The invention discloses a mid-infrared communication device which is characterized by at least comprising a graphene fiber, a data sending control circuit and a data receiving control circuit, wherein the graphene fiber is connected with the data sending control circuit or the data receiving control circuit to transmit or receive mid-infrared light; the raw materials of the invention have wide sources and can be prepared in batches; the communication device based on the mid-infrared light is the first example, has stable data transmission and wide application prospect in the fields of digital communication and the like.

Description

A mid-infrared communication device

technical field

The invention relates to the field of digital communication, in particular to a mid-infrared communication device.

Background technique

Digital communication technology is a cutting-edge technology that uses different light waves as the medium to realize data transmission, which usually includes two parts: receiving and sending. The current communication technology mainly uses long-wavelength microwaves as a medium, and is rarely involved in the short-wavelength region, mainly due to the lack of performance of photoelectric sensors.

Light with a wavelength of 2-25 microns is called mid-infrared light. Due to its special wavelength distribution, if the data transmission using mid-infrared light as a carrier can be realized, it will be in the forefront of molecular detection, medical care, meteorological science, confidential communication, etc. significant impact in the field.

Most of the traditional emission sources of mid-infrared light are constructed by semiconductor devices. This device has two major defects: one is low efficiency, and the other is that semiconductor devices are mostly brittle transition metal materials, which are expensive and expensive to manufacture.

Traditional mid-infrared light detectors can be divided into two types: one is semiconductor, which is relatively brittle and expensive; the other is micro- and nano-scale layered materials, such as graphene, transition metal oxygen (sulfur) ) compounds, etc., this material is difficult to withstand considerable mechanical action, and the efficiency is low. In addition, traditional mid-infrared detectors can only work at low temperatures and will gradually fail at high temperatures.

SUMMARY OF THE INVENTION

The invention provides a mid-infrared communication device, which mainly uses graphene fibers as mid-infrared photoelectric conversion materials.

The purpose of the present invention is to provide a mid-infrared communication device, which mainly uses graphene fibers as a mid-infrared electro-optical conversion material to achieve high-efficiency signal transmission in the mid-infrared band. The graphene fiber converts the input electrical energy into Joule heat through high-efficiency gray body radiation and radiates it out in the form of mid-infrared light, and the wavelength distribution and luminous frequency of the radiation can be regulated by the electric field; The temperature gradually increases, the intensity of luminescence increases, and the wavelength blue-shifts to short wavelengths. The distribution region of the light-emitting wavelength of the graphene fiber is 1-30 microns, and the light-emitting frequency reaches 10 MHz at the fastest.

Another object of the present invention is to provide a mid-infrared communication device, which mainly uses graphene fiber as a mid-infrared photoelectric-electric conversion material, and is a macro-scale of the signal acquisition chip in the existing communication equipment.

Another object of the present invention is to provide a mid-infrared communication device, which mainly uses graphene fiber as a mid-infrared photoelectric conversion material, solves the mechanical problem of signal acquisition chips in communication equipment, and can withstand considerable mechanical effects , woven, low price, low density and fast speed.

Another object of the present invention is to provide a mid-infrared communication device, which mainly uses graphene fibers as a mid-infrared photo-electric conversion material, which solves the problem of applicability of signal acquisition chips in communication equipment. The detection wavelength range is 3-10 microns, and the fastest detection frequency is 1 MHz. It is suitable for complex working environments. Among them, the working pressure environment is 0-1013mbar, and the working temperature environment is 30-400K.

Another object of the present invention is to provide a mid-infrared communication device, which mainly uses graphene fiber as a mid-infrared photo-electric, electric-optic bidirectional conversion material to realize half-duplex communication.

In order to achieve one of the above purposes, the present application adopts the following scheme: a mid-infrared communication device, comprising at least a receiving end and a transmitting end, the receiving end includes a first graphene fiber and a data transmission control circuit; the transmitting end includes a first graphene fiber and a data transmission control circuit; Two graphene fibers and a data receiving control circuit; the carbon-to-oxygen ratios of the first graphene fibers and the second graphene fibers are both above 10;

The data transmission control circuit includes:

A conversion module for converting the input signal into a bias voltage of 0.1-3.6V/cm; the bias voltage is applied at both ends of the second graphene fiber; the second graphene fiber is at 0.1-3.6V/cm Under the bias voltage, it emits mid-infrared light.

The data receiving control circuit includes:

A collection module for collecting a current signal flowing through the first graphene fiber, the collection module inputs a dark current below 100 mA to the first graphene fiber; the graphene fiber is dark current below 100 mA Under current excitation, the mid-infrared light is converted into electrical signals.

Further, the data receiving control circuit includes a display for displaying the current signal. In some preferred embodiments, the current signal can be converted into the digital signal using a high profile display.

Further, the data transmission control circuit includes an input module for inputting signals, such as a voice input module. Converting voice signals into electrical signals, and converting the electrical signals into bias signals suitable for mid-infrared emission of graphene fibers in the range of 0.1-3.6 V/cm are common technical means in the field, and will not be repeated in this application.

The graphene fibers are fixed between two metal electrodes, and the metal electrodes include gold, copper, silver, and zinc electrodes.

The graphene fibers are prepared by wet spinning, and the carbon-to-oxygen ratio is above 10.

Generally, the diameter of the graphene fiber is 0.1-1000 microns, and the length can be arbitrarily selected according to the actual situation.

The graphene fibers can exhibit various shapes, including solid cylinders, hollow cylinders, core-shell structures, ribbons, and spirals.

In some preferred embodiments, the electrical signal output by the receiving end can be used as the input signal of the transmitting end, thereby forming a repeater; the distance between two or more repeaters can be adjusted within the range of 0.1-100 cm.

As a common knowledge in the art, the communication device should also include a power module, which can be a mobile power module or a power access module (wire), to provide power for the communication device.

The present invention also provides the following half-duplex communication equipment:

It includes a graphene fiber, a switch, a data transmission control circuit and a data reception control circuit; the graphene fiber is connected with the data transmission control circuit or the data reception control circuit, and the connection relationship is switched through the switch; the The carbon-to-oxygen ratio of graphene fibers is above 10.

The data transmission control circuit includes:

A conversion module for converting an input signal into a bias voltage of 0.1-3.6V/cm; the bias voltage is applied at both ends of the graphene fiber; the graphene fiber is under a bias voltage of 0.1-3.6V/cm , emits mid-infrared light.

The data receiving control circuit includes:

A collection module for collecting a current signal flowing through the first graphene fiber, the collection module inputs a dark current below 100 mA to the graphene fiber; the graphene fiber is excited by a dark current below 100 mA, Converts mid-infrared light into electrical signals.

The switch is a relay.

The beneficial effects of the present invention are: the preparation process of the present invention is safe and controllable, the raw material sources are wide, and there is potential for batch preparation. This is the first communication device based on mid-infrared light, with stable data transmission and broad application prospects in digital communication and other fields.

Description of drawings

Fig. 1 is the schematic diagram of the device of the receiving end;

Figure 2 shows the response frequency of the receiver;

Fig. 3 is the graphene fiber-based fabric at the receiving end;

Figure 4 is the test result of the water washing resistance of the receiving end;

Figure 5 shows the responsivity and response frequency of the receiving end to mid-infrared light of different wavelengths;

6 is a schematic diagram of mid-infrared emission of graphene fibers;

FIG. 7 is a schematic diagram of the structure of the graphene fiber test device (A) and a schematic diagram of its emission frequency (B);

Figure 8 shows the wavelength distribution and theoretical curves of graphene fibers under different operating voltages, and the corresponding input electric fields in the curves are 1.1, 2.53, and 3.53 V/cm from bottom to top;

Figure 9 is a schematic diagram (A) and a physical diagram (B) of the communication device;

Figure 10 is a diagram of the transmission of signals from the left system to the right system. A-D are: input signal, graphene fiber output signal, denoised voltage signal, and amplified voltage signal.

Detailed ways

The present invention relates to a mid-infrared communication device, comprising a receiving end and a transmitting end. The receiving end and the transmitting end can work independently to realize signal receiving (embodiments 1-4) and transmitting and transmitting ends (5-9); Dependent, the signal is collected by the receiving end, and then transmitted by the transmitting end to realize the repeater function (Embodiment 11).

The present invention also relates to a half-duplex mid-infrared communication device (Embodiment 12), comprising a receiving end and a transmitting end, the receiving end and the transmitting end work independently, but share a core component-graphene fiber.

Example 1

(1) Using the dispersion of graphene oxide as the raw material (high-ene technology), a solid cylindrical fiber with a diameter of 20 microns was prepared by wet spinning technology, and the carbon-to-oxygen ratio was measured at 2000 °C for 10 min. 10.1.

(2) Fix graphene fibers with a length of 1 cm between copper electrodes to assemble a detector as shown in Figure 1, connect a current acquisition module to two electrodes, and input size to the graphene fibers through the two electrodes is 20mA dark current.

(3) Under the working pressure environment of 10mbar and the working temperature environment of 400K, the graphene fibers were irradiated with mid-infrared light with a wavelength of 3 microns and a power of 5 mW/cm ² , and current signals were collected through two electrodes. The current of the device produces a fast response, with a rising edge of 100 nanoseconds, a falling edge of 2 microseconds, and a response time of 0.9 microseconds, as shown in Figure 2.

Example 2

(1) Using the graphene oxide dispersion as the raw material (high-ene technology), a solid cylindrical graphene fiber with a diameter of 32 microns was prepared by wet spinning technology, and the carbon and oxygen The ratio is 11.

(2) Weaving the above graphene fibers into a woven fabric as shown in FIG. 3 .

(3) Set between copper electrodes on both sides of the woven cloth, the distance between the two electrodes is 3cm, a current acquisition module is connected to the two electrodes, and a dark current of 13mA is input.

(4) Under the working air pressure environment of 1013 mbar and the working temperature environment of 30 K, the graphene fibers were irradiated with mid-infrared light with a wavelength of 5.5 microns and a power of 7 mW/cm ² , and current signals were collected through two electrodes. The current of the device produces a fast response of 130 nanoseconds for the rising edge, 3.3 microseconds for the falling edge, and a response time of 1.1 microseconds.

The fabric was washed several times (drum washing machine, 30 degrees Celsius, 800 rpm, 15 minutes each time), and the test results showed that the original responsiveness was maintained after 8 washings.

Example 3

(1) Using the dispersion of graphene oxide as the raw material (high-ene technology), a solid cylindrical fiber with a diameter of 45 microns was prepared by wet spinning technology, and the carbon-to-oxygen ratio was measured at 2000 °C for 20 min. 10.4.

(2) A graphene fiber with a length of 10 cm is fixed between copper electrodes, a current acquisition module is connected to the two electrodes, and a dark current of 3 mA is input.

(3) Under the working air pressure environment of 1013 mbar and the working temperature environment of 400 K, the graphene fibers were irradiated with mid-infrared light with a power of 9 mW/cm ² and a wavelength of 3 microns, and current signals were collected through two electrodes. The current of the device produces a fast response of 140 nanoseconds for the rising edge, 4.5 microseconds for the falling edge, and a response time of 1.3 microseconds.

Example 4

(1) Using the dispersion of graphene oxide as the raw material (high-ene technology), a solid cylindrical fiber with a diameter of 150 microns was prepared by wet spinning technology, and the carbon-oxygen ratio was measured at 2000 °C for 30 min. 10.8.

(2) Fix graphene fibers with a length of 5 cm between copper electrodes, connect a current acquisition module to the two electrodes, and input a dark current of 3 mA.

(3) In the working air pressure environment of 1013 mbar and the working temperature environment of 400 K, the graphene fibers were irradiated with mid-infrared light with a power of 9 mW/cm ² and a wavelength of 3-10 microns, and current signals were collected through two electrodes. As shown in Figure 5, the response current varies with wavelength.

It can be determined from the above Embodiments 1-5 that the receiving end of the present application can at least realize 0-1 data communication by collecting mid-infrared signals. Further, those skilled in the art can construct an analog curve of the current-optical signal by analyzing the rising edge, falling edge, response time and current magnitude of the output current signal, and realize high-precision communication by collecting mid-infrared signals.

Example 5

(1) Using graphene oxide dispersion as raw material, using wet spinning technology and high-temperature thermal reduction technology to prepare ribbon-shaped graphene fibers with a diameter of 10 microns, and control the carbon-to-oxygen ratio at 10-11 by controlling the reduction time between.

(2) Take a graphene fiber with a length of 1cm and fix it between the zinc electrodes to input a bias voltage to obtain a transmitter. Under the working pressure environment of 10mbar and the working temperature environment of 400K, input the electric field and control it through the conversion module The input voltage is in the range of 0.1-3.6 V/cm, so that the graphene fiber emits mid-infrared light. The schematic diagram of the mid-infrared emission of graphene fiber is shown in Figure 6. When the electric field intensity is 0.1V/cm, 0.3V/cm, 1V/cm, 2V/cm, 3V/cm, 3.6V/cm, the surface temperature, luminescence intensity and luminescence wavelength of graphene fibers change, as shown in the table 1 shown. The variation of the luminous frequency is shown in Fig. 7.

Table 1: Surface temperature and emission wavelength of graphene fibers under different electric field strengths

It can be seen from Table 1 that with the increase of electric field intensity, the surface temperature of graphene fibers increases, the luminescence intensity increases, and the luminescence wavelength blue-shifts to short wavelengths.

It can be seen from Figure 7 that the emission frequency of graphene fibers is not affected by the magnitude of the electric field.

Figure 8 shows the wavelength distribution and theoretical curve of graphene fibers under different working voltages. By comparing with the theoretical curve of gray body radiation, it can be confirmed that the working principle of the mid-infrared emission of graphene fibers is gray body radiation, and the efficiency is high.

Example 6

(1) Using the graphene oxide dispersion as the raw material, a solid cylindrical graphene fiber with a diameter of 30 microns was prepared by wet spinning technology and high temperature thermal reduction technology, and the carbon-to-oxygen ratio was controlled at 10- by controlling the reduction time. between 11.

(2) Graphene fibers with a length of 2.5 cm were fixed between copper electrodes, and the working air pressure environment was 1013 mbar; the working temperature environment was 30 K, and an electric field with an input strength of 1 V/cm was used. After testing, the surface temperature of the graphene fiber is about 330K at this time, and the mid-infrared light with a wavelength distribution of 1.8-12 microns is emitted, and the emission frequency is 10 MHz.

Example 7

(1) Using the graphene oxide dispersion as the raw material, a core-shell structure graphene fiber with a diameter of 80 microns was prepared by wet spinning technology, and the carbon-to-oxygen ratio was controlled between 10-11 by controlling the reduction time.

(2) Graphene fibers with a length of 5 cm were fixed between the silver electrodes. The working air pressure environment was 1013 mbar; the working temperature environment was 400 K, and an electric field with an input strength of 2.5 V/cm was input. After testing, the surface temperature of the graphene fiber is about 580K at this time, and the mid-infrared light with a wavelength distribution of 1.6-12 microns is emitted, and the emission frequency is 10 MHz.

Example 8

(1) Using graphene oxide dispersion as raw material, using wet spinning technology and high temperature thermal reduction technology to prepare hollow cylindrical graphene fibers with a diameter of 100 microns, and controlling the reduction time to control the carbon-to-oxygen ratio at 10 Between -11.

(2) Graphene fibers with a length of 8 cm were fixed between the zinc electrodes. The working air pressure was 1013 mbar; the working temperature was 400 K, and an electric field with a strength of 3 V/cm was input. After testing, the surface temperature of the graphene fiber is about 630K at this time, and the mid-infrared light with a wavelength distribution of 1.5-12 microns is emitted, and the emission frequency is 10 MHz.

Example 9

(1) Using graphene oxide dispersion as raw material, using wet spinning technology and high-temperature thermal reduction technology to prepare helical graphene fibers with a diameter of 200 microns, and controlling the reduction time to control the carbon-to-oxygen ratio at 10- between 11.

(2) Graphene fibers with a length of 10 cm were fixed between copper electrodes, and the working air pressure environment was 1013 mbar; the working temperature environment was 400 K, and an electric field with a magnitude of 3.5 V/cm was input. After testing, the surface temperature of the graphene fiber is about 660K at this time, and the mid-infrared light with a wavelength distribution of 1.5-12 microns is emitted, and the emission frequency is 10 MHz.

Through the above examples 6-10, it can be determined that at the emission end with the graphene fiber as the core, the high-efficiency gray body radiation converts the input electrical energy into Joule heat and radiates it out in the form of mid-infrared light. The wavelength distribution of the radiation and the luminescence The frequency can be regulated by the electric field; gradually increasing the input electric field, the temperature of the fiber surface gradually increases, the intensity of the luminescence increases, and the wavelength blue-shifts to the short wavelength. The distribution region of the light-emitting wavelength of the graphene fiber is 1-30 microns, and the light-emitting frequency reaches 10 MHz at the fastest.

Example 10

The detector assembled in Example 1 and the transmitter assembled in Example 5 are assembled into a module to obtain a communication device, which acquires signals through the detector and transmits signals through the transmitter.

Therefore, by assembling any detector in Examples 1-4 and any transmitter in Examples 5-9, a communication device that can work in a complex environment can be obtained.

Example 11

(1) Using the dispersion of graphene oxide as the raw material (high-ene technology), a solid cylindrical fiber with a diameter of 20 microns was prepared by wet spinning technology, and the carbon-to-oxygen ratio was measured at 2000 °C for 10 min. 10.1.

(2) A graphene fiber with a length of 1 cm is fixed between copper electrodes, a current acquisition module is connected to two electrodes, and a dark current of 20 mA is input to the graphene fiber through the two electrodes, thereby assembling a detector. (Receiving end).

(3) A graphene fiber with a length of 1 cm is fixed between the copper electrodes, a conversion module is connected to the two electrodes, and a transmitter (transmitter end) is assembled.

(4) Connect the conversion module to the current acquisition module, and use a power module to input voltage to the graphene fiber at the transmitter end. The conversion module converts the input voltage into a bias signal in the range of 0.1-3.6V/cm according to the current signal, and ensures The magnitude of the bias voltage is proportional to the current signal.

(5) Between the signal transmitter and the signal terminal, build a communication environment with a working air pressure of 1013mbar and a working temperature of 400K. In this communication environment, set up 5 communication devices (repeaters) assembled from steps 1-4. ). The signal transmitting end emits mid-infrared signals, and the signal receiving end is an indium gallium arsenide detector.

Through the above method, relay transmission in a complex environment can be realized.

Example 12

(1) Using the graphene oxide dispersion as the raw material, the hollow columnar graphene fibers with a diameter of 1 μm were prepared by wet spinning technology, and the carbon-to-oxygen ratio was measured to be 11.3. Graphene fibers with a length of 2 cm were immobilized between two copper electrodes.

(2) Two sets of communication devices are constructed, each set of communication devices includes a graphene fiber, a switch (relay), a data transmission control circuit and a data reception control circuit, as shown in Figures 9A and B; the graphene fiber and the The data transmission control circuit or the data reception control circuit are connected, and the connection relationship is switched by the switch.

The data transmission control circuit includes:

A conversion module (amplifier) for converting the input signal (input through DA) into a bias voltage of 0.1-3.6V/cm; the bias voltage is applied at both ends of the graphene fiber; the graphene fiber is at 0.1 Under a bias voltage of -3.6V/cm, it emits mid-infrared light.

The data receiving control circuit includes:

A collection module for collecting a current signal flowing through the first graphene fiber. In this embodiment, the collection module includes an AD module, and the collection module inputs a dark current below 100 mA to the graphene fiber; the graphene Under the excitation of the dark current below 100mA, the fiber converts the mid-infrared light into an electrical signal, and the AD module converts the electrical signal into a digital signal. An LCD display is included in the circuit to display this digital signal.

The graphene fibers on the left and right sides are parallel and symmetrical to each other, and the distance is 5 cm.

The communication test is carried out under the working pressure of 1013mbar and the working temperature of 400K.

The system on the left is switched to transmit mode, the graphene fiber is connected to the data transmission control circuit, the input signal is converted into a voltage signal through DA, and the voltage is further controlled below 7.2V through the conversion module, as shown in Figure 10A . The graphene fibers of the left system emit mid-infrared light to the right system under bias excitation.

The system on the right is switched to receive mode, and the graphene fiber is connected to the data receiving control circuit. Under the excitation of the dark current (80mA) given by the acquisition module, the graphene fiber on the right receives the mid-infrared light and outputs the electrical signal as shown in Figure 10B. The voltage signal as shown in Figure 10D is obtained after the modified electrical signal is denoised (10C) and amplified by the acquisition module.

Comparing Figures 10A and 10D, it can be seen that the input signal and the output signal have the same frequency. Accurate data communication can be achieved through the communication device.

In the same way, switch the left system to receive mode, the right system to transmit mode, and input signals to the right system can also transmit only the left system to realize communication.

Claims (9)

1. The intermediate infrared communication device is characterized by at least comprising a receiving end and a transmitting end, wherein the receiving end comprises a first graphene fiber and a data transmission control circuit; the transmitting end comprises a second graphene fiber and a data receiving control circuit; the carbon-oxygen ratio of the first graphene fiber and the second graphene fiber is more than 10;

the data transmission control circuit includes:

the conversion module is used for converting an input signal into a bias voltage of 0.1-3.6V/cm, wherein the bias voltage is applied to two ends of the second graphene fiber; the second graphene fiber emits mid-infrared light under the bias voltage of 0.1-3.6V/cm;

the data reception control circuit includes:

the acquisition module is used for acquiring a current signal flowing through the first graphene fiber, and the acquisition module inputs a dark current below 100mA to the first graphene fiber; the graphene fiber converts mid-infrared light into an electric signal under the excitation of dark current below 100 mA.

2. The mid-infrared communication device as claimed in claim 1, wherein the data reception control circuit includes a display for displaying the current signal.

3. The mid-infrared communication device as claimed in claim 1, wherein the data transmission control circuit includes an input module for inputting a signal.

4. The mid-infrared communication device as claimed in claim 3, wherein the input module is a voice input module.

5. The graphene fiber according to claim 1, wherein the first graphene fiber and the second graphene fiber are each fixed between two metal electrodes.

6. The graphene fiber according to claim 1, wherein the graphene fiber is prepared by wet spinning.

7. The graphene fiber according to claim 1, wherein the graphene fiber may exhibit various morphologies including solid cylinders, hollow cylinders, core-shell structures, ribbon, helical.

8. The intermediate infrared communication device is characterized by comprising a graphene fiber, a switch, a data transmission control circuit and a data receiving control circuit; the graphene fiber is connected with the data sending control circuit or the data receiving control circuit, and the connection relation is switched through the selector switch; the carbon-oxygen ratio of the graphene fiber is more than 10;

the data transmission control circuit includes:

the conversion module is used for converting an input signal into bias voltage of 0.1-3.6V/cm, wherein the bias voltage is applied to two ends of the graphene fiber; the graphene fiber emits mid-infrared light under the bias voltage of 0.1-3.6V/cm;

the data reception control circuit includes:

the acquisition module is used for acquiring a current signal flowing through the first graphene fiber, and the acquisition module inputs a dark current below 100mA to the graphene fiber; the graphene fiber converts mid-infrared light into an electric signal under the excitation of dark current below 100 mA.

9. The mid-infrared communication device as claimed in claim 8, wherein the switch is a relay.

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