CN101577582A - Diffraction-free laser communication device for transmission among serial ports of computers - Google Patents
Diffraction-free laser communication device for transmission among serial ports of computers Download PDFInfo
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- CN101577582A CN101577582A CNA2008101062654A CN200810106265A CN101577582A CN 101577582 A CN101577582 A CN 101577582A CN A2008101062654 A CNA2008101062654 A CN A2008101062654A CN 200810106265 A CN200810106265 A CN 200810106265A CN 101577582 A CN101577582 A CN 101577582A
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Abstract
The invention discloses a diffraction-free laser communication device for the transmission among serial ports of computers, which consists of level conversion circuits, a laser driving circuit, a laser, a diffraction-free light generation device, a PIN detector and a photoelectric detection circuit. Data is transferred to the level conversion circuit at a sending terminal through a serial port of a computer at the sending terminal, the level conversion circuit at the sending terminal converts a RS232 level signal into a level signal which is suitable to be input by the laser driving circuit, the laser driving circuit modulates the working current of the laser to ensure that the light intensity of a Gaussian beam emitted by the laser changes with transmitted data, and the Gaussian beam is changed into a diffraction-free beam carried with data information through the diffraction-free light generation device; and at a receiving terminal, the PIN detector converts a diffraction-free light signal into a current signal, the photoelectric detection circuit converts the current signal of the PIN detector into a voltage signal and performs two-stage amplification, the level conversion circuit at the receiving terminal is used to convert the level signal output by the photoelectric detection circuit into a RS232 level signal which is suitable to be input by a serial port, and the final RS232 level signal is input into a computer at the receiving terminal through the serial port.
Description
(1) technical field:
The present invention relates to a kind of diffraction-free laser communication device for transmission among serial ports of computers, belong to the wireless laser communication technical field.
(2) background technology:
The wireless laser communication technology is an emerging technology, and it is simple and easy that it has installation, and the advantage that environmental suitability is strong has more application in fields such as local area network (LAN), high-speed parallel computing system.In adopting the radio telecommunicaltion system of common Gaussian beam as information carrier, though Gaussian beam has the less angle of divergence, but the spot radius of receiving terminal still has expansion to a certain degree, especially when the beam Propagation distance is very big, the degree of scatter aggravation of energy is unfavorable for concentrating of light energy; Simultaneously, for the Gaussian beam that will disperse focuses on, also need increase optical antenna at receiving terminal.During (board-to-board) light interconnects between the plate of high-speed parallel computing system, adopted the mode of laser array to distinguish different communication channels, if can reduce the radius of light beam, then can improve the density of laser on the plate, dwindle the spacing between the laser and between the photodetector, weaken crosstalking of electromagnetic interference and each interchannel, dwindle the volume of chip.
Though existing wireless laser communication technology is obtaining very big progress aspect theory research and the practicability, also have many problems to need further research with perfect.For example name is called: the novel air laser communication device, application number is: 01246216.0 utility model patent, by between collimation, the laser signal source of linear polarization and narrow visual field receiver, setting up a photo-signal channel, finish the optical communication under strong day optical noise, need be by measuring respectively on polarization direction x, the y of two identical PIN photodiode to two quadratures, because existing, Gaussian beam disperses, also need to adopt telescope to aim at, increased the complexity of optical system and Photodetection system.For example name is called: high speed laser space communication receiving system and laser communication system between mobile object, application number is: 200510069059.7 patent of invention, it is characterized in that described laser pick-off unit, array for the photosensitive unit formation, because the receiving area of the laser receiver of this invention is expanded by the photosensitive unit array, can accomplish very big, therefore can solve " aligning " difficult problem of laser communication between two mobile objects very easily, its shortcoming is directly to use uncollimated laser beam to aim at, make that the hot spot of receiving terminal is relatively large, the size of corresponding photoelectric receiving arrangement also can be bigger, simultaneously, than the large spot diameter restrictions raising of alignment precision.For example name is called: the center type radio telecommunicaltion system that is used for ethernet local area network, application number is: 02100710.1 patent of invention, contain replace netting twine to be installed on the computer network interface card separately respectively and hub on two wireless laser transceivers with different emission and spectral response range, can not revise upper-layer protocol, the telecommunication mode is seamlessly transitted to the wireless light communication mode, and can in same local area network (LAN), mix and use wired and wireless dual mode, because hub need be surveyed the light signal in the local area network (LAN), therefore must increase the beam divergence angle of transmitting terminal, corresponding background noise increase and capacity usage ratio are lower, outside it, the optical antenna of receiving terminal has not only increased the system complex degree, has also increased energy loss.
The angle of divergence of diffraction light-free bundle is almost nil, and the diameter of center spot is very little, can reach micron order.Adopt the diffraction light-free bundle to replace Gaussian beam to carry out wireless light communication as information carrier, it is little to bring into play its center spot diameter, the advantage of concentration of energy, this not only can improve capacity usage ratio, because beam divergence is almost nil, need not optical antenna, can also dwindle the volume of communication equipment, the simplified communication system structure.Between the plate of high-speed parallel computing system, in the application scenario such as light interconnection, can increase the density of laser array and photodetector array, thereby increase channel quantity.
(3) summary of the invention:
The object of the present invention is to provide a kind of diffraction-free laser communication device for transmission among serial ports of computers, utilize the diffraction light-free bundle to replace Gaussian beam as information carrier, with higher system capacity usage ratio and information privacy degree, carry out the wireless laser communication between serial ports of computers.
A kind of diffraction-free laser communication device for transmission among serial ports of computers of the present invention, its technical scheme is:
A kind of diffraction-free laser communication device for transmission among serial ports of computers utilizes the diffraction light-free bundle to replace Gaussian beam as information carrier, with higher system capacity usage ratio and information privacy degree, carries out the wireless laser communication between serial ports of computers.This communicator is made up of transmitting terminal level shifting circuit, laser drive circuit, laser, diffraction light-free generating means, PIN detector, photoelectric detective circuit and receiving terminal level shifting circuit.In diffraction-free laser communication device for transmission among serial ports of computers, data are sent to the transmitting terminal level shifting circuit through the transmitting terminal serial ports of computers, the transmitting terminal level shifting circuit is converted to the level signal that is fit to the laser drive circuit input with the RS232 level signal of serial ports output, according to the data of being transmitted, operating current by the laser drive circuit modulated laser, make the light intensity of the Gaussian beam that laser sends change with the data of transmitting, the Gaussian beam that is loaded with data message is for conversion into the diffraction light-free bundle that is loaded with data message through the diffraction light-free generating means; At receiving terminal, the diffraction light-free conversion of signals that will be loaded with data message by the PIN detector is a current signal, the variation pattern of this current signal has also reacted the variation of transmission data, photoelectric detective circuit is converted to the current signal of PIN detector output voltage signal and carries out the two-stage processing and amplifying, the level signal of photoelectric detective circuit being exported by the receiving terminal level shifting circuit is converted to the RS232 level signal that is fit to the serial ports input at last, and final RS232 level signal is through serial ports input receiving end computer.
The input and output of serial data are controlled by software.
Wherein, described current signal≤5mA.
Wherein, described laser drive circuit is that main body constitutes by the laser-driven chip MAX3263 of U.S. letter (MAXIM) company, and drive laser is luminous; MAX3263 adopts the input of PECL level; But the MAX3263 outer meeting resistance is set the modulated current and the bias current of laser; The output current of MAX3263 is controlled by mirror current source, when temperature changes in 0 ℃～70 ℃ scopes, can export stable electric current.
Wherein, photoelectric detective circuit serves as main formation with the trans-impedance amplifier chip (model is MAX3658) and the limiting amplifier chip (model is MAX3761) of U.S. letter (MAXIM) company; MAX3658 is as preamplifier, and chip MAX3761 amplifies modulate circuit as the back level; At last, photoelectric detective circuit exports the receiving terminal level shifting circuit to the PECL level.
A kind of diffraction-free laser communication device for transmission among serial ports of computers of the present invention, its advantage and effect are:
(1) beam diameter thin (micron level), disperse almost nil, the capacity usage ratio height.
(2) optical antenna that need not focus gauss light beam, simple in structure, it is convenient that light path is aimed at.
(3) laser drive circuit of Cai Yonging and photoelectric detective circuit have automatic control function of power and No Light Alarm output function respectively, not only can keep the constant of emission laser power, also can avoid meeting the error code that produces when blocking on the way at Communication ray.
(4) communication system is connected with computer by serial ports, uses ready-made RS232 serial communication standard, and different communication bit rate can be set more conveniently, satisfies the requirement of different communication speed.
(4) description of drawings:
Figure 1 shows that the The general frame of diffraction-free laser communication device for transmission among serial ports of computers of the present invention
The inside that Figure 2 shows that transmitting terminal level shifting circuit and laser drive circuit is formed.
Figure 3 shows that Conical Lenses is the diffraction light-free generating means figure of core.
Figure 4 shows that the photoelectric detective circuit part.
Figure 5 shows that the Control on Communication flow chart.
(5) embodiment:
Below in conjunction with accompanying drawing, technical scheme of the present invention is described further.
1, the general structure of diffraction-free laser communication device for transmission among serial ports of computers
As shown in Figure 1, diffraction-free laser communication device for transmission among serial ports of computers is made up of transmitting terminal level shifting circuit, laser drive circuit, laser, diffraction light-free generating means, PIN detector, photoelectric detective circuit and receiving terminal level shifting circuit.In diffraction-free laser communication device for transmission among serial ports of computers, data are sent to the transmitting terminal level shifting circuit through the transmitting terminal serial ports of computers, (+12V represents 0 to the RS232 level signal that the transmitting terminal level shifting circuit is exported serial ports,-12V represents 1) be converted to the level signal that is fit to the laser drive circuit input, according to the data of being transmitted, operating current by the laser drive circuit modulated laser, make the light intensity of the Gaussian beam that laser sends change with the data of transmitting, the Gaussian beam that is loaded with data message is for conversion into the diffraction light-free bundle that is loaded with data message through the diffraction light-free generating means; At receiving terminal, the diffraction light-free conversion of signals that will be loaded with data message by the PIN detector be current signal (≤5mA), the variation pattern of this current signal has also reacted the variation of transmission data, photoelectric detective circuit is converted to the current signal of PIN detector output voltage signal and carries out the two-stage processing and amplifying, the last level signal of photoelectric detective circuit being exported by the receiving terminal level shifting circuit is converted to the RS232 level signal that is fit to the serial ports input, and (+12V represents 0,-12V represents 1), final RS232 level signal is through serial ports input receiving end computer.The input and output of serial data are controlled by software.
2, each part of diffraction-free laser communication device for transmission among serial ports of computers
The inside of transmitting terminal level shifting circuit and laser drive circuit is formed as shown in Figure 2.The transmitting terminal level shifting circuit is made up of the level transferring chip (model is MAX232) of U.S. letter (MAXIM) company and the level transferring chip (model is MC10ELT20) and the peripheral cell thereof of ONNN (ON Semiconductor) company.Laser drive circuit is equipped with the peripheral cell formation by the laser driving chip (model is MAX3263) of U.S. letter (MAXIM) company.By the transmitting terminal level shifting circuit that MAX232 and MC10ELT20 form, the RS232 level signal that serial ports is exported is converted to the PECL level signal that satisfies MAX3263 input requirement.Wherein, MAX232 is the RS232-TTL transducer, and MC10ELT20 is the TTL-PECL transducer.Conversion is divided into two steps: MAX232 the RS232 level signal is converted to the Transistor-Transistor Logic level signal, MC10ELT20 requires the Transistor-Transistor Logic level conversion of signals for suitable MAX3263 incoming level PECL level signal.
By MAX3263 is that the laser drive circuit drive laser that constitutes of main body is luminous.MAX3263 has automated power control (Automatic Power Control) function, is fit to 0～155Mbits/s speed, so it has satisfied the requirement of serial ports of computers transmission maximum rate.MAX3263 adopts the input of PECL level, because the PECL level is a kind of differential level signal, therefore noise has been played very strong inhibitory action, and its inside also has slow start-up circuit simultaneously, is used to protect laser.Utilize the outer meeting resistance of MAX3263 to set to the modulated current and the bias current of laser.The output current of MAX3263 is all controlled by mirror current source, when temperature changes in 0 ℃～70 ℃ scopes, can export stable electric current.This characteristic can be avoided the influence of variations in temperature to laser modulation current.
Adopt the light source of red light semiconductor laser as diffraction-free laser communication device for transmission among serial ports of computers.Its output wavelength is 635nm, and operating current is less than 70mA, and emergent pupil power is 2mW, and operating temperature range is-10 °～40 °, surpasses 5000h useful life.Because the output light-wave of this laser is a visible light, helps the aligning and the debugging of light path.
In diffraction-free laser communication device for transmission among serial ports of computers, adopt the Conical Lenses method to produce the diffraction light-free bundle, promptly the diffraction light-free generating means is core with the Conical Lenses, Fig. 3 is to be the diffraction light-free generating means figure of core with the Conical Lenses.Convex lens 1 (focal length is 30mm) and convex lens 2 (focal length is 280mm) are formed the beam-expanding collimation part of diffraction light-free generating means, the distance of convex lens 1 distance lasers is arbitrarily, the distance of convex lens 1 and convex lens 2 should be its focal length sum (310mm), the Gaussian beam of laser emitting is through becoming approximate plane wave light beam after the beam-expanding collimation, the bottom surface of almost plane glistening light of waves bundle incident Conical Lenses is at the exit direction ejaculation diffraction light-free bundle of Conical Lenses.The parameter of used Conical Lenses is: the bottom surface cone angle
Bottom surface radius R=5mm, material refractive index n=1.5.
Because Conical Lenses bottom surface cone angle
Very little, can think
And tan θ=θ (θ marks in Fig. 3).No range of diffraction Z
MaxFor:
The intrafascicular heart spot diameter of diffraction light-free d is:
With λ=635nm,
R=5mm is that the Theoretical Calculation result of parameter is: the intrafascicular heart spot diameter of diffraction light-free is 55.5 μ m, and no range of diffraction (maximum propagation distance) is 57.3cm.Actual no range of diffraction should be less than calculated value, and this is because the light beam of incident Conical Lenses bottom surface and nonideal plane wave light beam.
Because the PIN detector uses simple, sensitivity is higher, in diffraction-free laser communication device for transmission among serial ports of computers, adopt certain type PIN detector to the red spectral band sensitivity as photodetector, it belongs to silicon photoelectric diode, the wavelength photoreceptor scope is 300nm～900nm, and photosensitive area is 0.1mm.PIN detector induction diffraction light-free signal, and be converted into the signal of telecommunication that is loaded with data message, it is the key element of opto-electronic conversion.
The effect of photoelectric detective circuit is the current signal that amplifies the output of PIN detector, for the voltage signal that will satisfy certain level requirement is prepared by serial ports input computer.As shown in Figure 4, photoelectric detective circuit is provided with peripheral resistance capacitance based on the trans-impedance amplifier chip (model is MAX3658) and the limiting amplifier chip (model is MAX3761) of U.S. letter (MAXIM) company according to the technical manual of chip.MAX3658 is as preamplifier, and it has low noise (noise current is less than 45nA), the characteristics of high-gain (18K strides in Europe the resistance multiplication factor), and chip MAX3761 amplifies modulate circuit as the back level.At last, photoelectric detective circuit exports the receiving terminal level shifting circuit to the PECL level.MAX3761 has LOS threshold value (Loss-of-signalThreshold) set-up function, when input signal amplitude during greater than preset threshold voltage, the PECL level that the data output end output amplitude is constant, when the input signal amplitude less than the time, the output of the inner unglazed comparator of MAX3761 forces all limiting amplifier refusals to accept input signal, and promote the No Light Alarm signal that post-amplifier is exported Transistor-Transistor Logic level, and prompt system communication disruption this moment, this helps beam alignment is debugged.
The receiving terminal level shifting circuit is made up of the level transferring chip (model is MAX232) of U.S. letter (MAXIM) company and the level transferring chip (model is MC10ELT21) of ONNN (ON Semiconductor) company, and this circuit is converted to the RS232 level signal that satisfies serial ports input requirement with the PECL level signal of photoelectric detective circuit output.Wherein, MC10ELT21 is converted to the Transistor-Transistor Logic level signal as the PECL-TTL transducer with the PECL level signal; MAX232 is as the TTL-RS232 transducer, the RS232 level signal of Transistor-Transistor Logic level conversion of signals for suitable serial ports of computers input.
Adopt the communication control MSComm of Visual Basic6.0 to carry out the communications control software design of diffraction-free laser communication device for transmission among serial ports of computers.MSComm can provide the repertoire of serial communication, programming, the debugging simple and convenient, development rate is fast, this control has encapsulated the bottom operation program in the communication process, the user only need be provided with and monitor the attribute and the incident of control, just can realize serial communication easily.
When adopting the MSComm control to receive data, divide two kinds of forms: event driven manner and timing inquiry mode according to receive mode.In diffraction-free laser communication device for transmission among serial ports of computers, adopt event driven manner, promptly handle communication event or mistake by the OnComm incident of catching the MSComm control.Serial port setting comprises the setting of string slogan, communication baud rate, parity check bit, data bit and position of rest, and these settings can be finished by the attribute that the MSComm control is set.The Control on Communication flow process as shown in Figure 5.
3, the technical indicator of apparatus of the present invention
(1) no diffraction laser effective communication distance: 410mm.
(2) communication bit rate can be arranged to multiple ranks such as 300bps, 600bps, 1200bps, 2400bps, 4800bps, 9600bps, 14400bps and 19200bps.The maximum transmitted bit rate is 19.2kbps.
Claims (4)
1, a kind of diffraction-free laser communication device for transmission among serial ports of computers, it is characterized in that: this device is to utilize the diffraction light-free bundle to replace Gaussian beam as information carrier, with higher system capacity usage ratio and information privacy degree, carry out the wireless laser communication between serial ports of computers; This device is made up of transmitting terminal level shifting circuit, laser drive circuit, laser, diffraction light-free generating means, PIN detector, photoelectric detective circuit and receiving terminal level shifting circuit; In diffraction-free laser communication device for transmission among serial ports of computers, data are sent to the transmitting terminal level shifting circuit through the transmitting terminal serial ports of computers, the transmitting terminal level shifting circuit is converted to the level signal that is fit to the laser drive circuit input with the RS232 level signal of serial ports output, according to the data of being transmitted, operating current by the laser drive circuit modulated laser, make the light intensity of the Gaussian beam that laser sends change with the data of transmitting, the Gaussian beam that is loaded with data message is for conversion into the diffraction light-free bundle that is loaded with data message through the diffraction light-free generating means; At receiving terminal, the diffraction light-free conversion of signals that will be loaded with data message by the PIN detector is a current signal, the variation pattern of this current signal has also reacted the variation of transmission data, photoelectric detective circuit is converted to the current signal of PIN detector output voltage signal and carries out the two-stage processing and amplifying, the level signal of photoelectric detective circuit being exported by the receiving terminal level shifting circuit is converted to the RS232 level signal that is fit to the serial ports input at last, and final RS232 level signal is through serial ports input receiving end computer; The input and output of serial data are controlled by software.
2, diffraction-free laser communication device for transmission among serial ports of computers according to claim 1 is characterized in that: described current signal≤5mA.
3, diffraction-free laser communication device for transmission among serial ports of computers according to claim 1 is characterized in that: described laser drive circuit is that main body constitutes by MAX3263, and drive laser is luminous; MAX3263 adopts the input of PECL level; But the MAX3263 outer meeting resistance is set the modulated current and the bias current of laser; The output current of MAX3263 is controlled by mirror current source, when temperature changes in 0 ℃～70 ℃ scopes, can export stable electric current.
4, diffraction-free laser communication device for transmission among serial ports of computers according to claim 1 is characterized in that: described photoelectric detective circuit is based on trans-impedance amplifier chip MAX3658 and limiting amplifier chip MAX3761; The trans-impedance amplifier chip is as preamplifier, and the limiting amplifier chip amplifies modulate circuit as the back level; At last, photoelectric detective circuit exports the receiving terminal level shifting circuit to the PECL level.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107356937A (en) * | 2017-08-25 | 2017-11-17 | 长春德信光电技术有限公司 | A kind of walking robot collision warning device based on Laser Detection Technique |
| CN107800026A (en) * | 2017-10-27 | 2018-03-13 | 大族激光科技产业集团股份有限公司 | A kind of adjustment method of the outer beam path alignment of laser |
| CN107911163A (en) * | 2017-12-18 | 2018-04-13 | 长春光客科技有限公司 | Centimeter Level closely gigabit wireless light communication device and method |
| CN112230072A (en) * | 2020-09-28 | 2021-01-15 | 杭州永谐科技有限公司 | Far-field antenna test system and alignment method |
| CN113949448A (en) * | 2020-07-16 | 2022-01-18 | 青岛海信宽带多媒体技术有限公司 | Optical module receiving optical power monitoring method and optical module |
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2008
- 2008-05-09 CN CNA2008101062654A patent/CN101577582A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356937A (en) * | 2017-08-25 | 2017-11-17 | 长春德信光电技术有限公司 | A kind of walking robot collision warning device based on Laser Detection Technique |
| CN107800026A (en) * | 2017-10-27 | 2018-03-13 | 大族激光科技产业集团股份有限公司 | A kind of adjustment method of the outer beam path alignment of laser |
| CN107911163A (en) * | 2017-12-18 | 2018-04-13 | 长春光客科技有限公司 | Centimeter Level closely gigabit wireless light communication device and method |
| CN113949448A (en) * | 2020-07-16 | 2022-01-18 | 青岛海信宽带多媒体技术有限公司 | Optical module receiving optical power monitoring method and optical module |
| CN112230072A (en) * | 2020-09-28 | 2021-01-15 | 杭州永谐科技有限公司 | Far-field antenna test system and alignment method |
| CN112230072B (en) * | 2020-09-28 | 2023-09-05 | 杭州永谐科技有限公司 | Far-field antenna test system and alignment method |
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