CN106330329B - Based on the wireless light communication devices and methods therefor for directly modulating DPSSL - Google Patents
Based on the wireless light communication devices and methods therefor for directly modulating DPSSL Download PDFInfo
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- CN106330329B CN106330329B CN201610710640.0A CN201610710640A CN106330329B CN 106330329 B CN106330329 B CN 106330329B CN 201610710640 A CN201610710640 A CN 201610710640A CN 106330329 B CN106330329 B CN 106330329B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The present invention relates to wireless communication fields, it is desirable to provide a kind of based on the wireless light communication devices and methods therefor for directly modulating DPSSL.The wireless light communication device includes transmitting end device and receiving end device；The former includes the first signal processor, first voltage amplifier, the first adjustable attenuator, bias drive module, DPSSL and transmitting terminal lens；Wherein, the first signal processor, first voltage amplifier, the first adjustable attenuator, bias drive module and DPSSL are sequentially connected, and the transmitting terminal and transmitting terminal lens of DPSSL is positioned opposite.Relative to the height of system complexity in the prior art, the defects of optical quality and insufficient luminous power, the present invention has many advantages, such as that peak power height, good beam quality, compact-sized, stability is good, realization is simple.Spectrum efficiency and transmission rate can be effectively such as promoted further combined with software radio and Digital Signal Processing, realizes the wireless optical transmission of information of high speed long range, there is great researching value and wide application prospect.
Description
Technical field
It is more particularly to a kind of based on the directly wireless light communication dress of modulation DPSSL the present invention relates to wireless communication field
It puts and its method.
Background technology
With the development of high efficiency, high-power laser diode (Laser diode, LD) and its array, two pole of laser
The solid state laser (Diode-pumped solid-state lasers, DPSSL) at tube pump Pu is in property indices and realization
Great progress is achieved in terms of industrialization.DPSSL have peak power height, good beam quality, compact-sized, stability is good,
The advantages that long lifespan, wide wavelength cover.At present, it is widely used in industrial lasers processing, laser ranging, laser are shown
Show, the fields such as optical Information Processing and optic communication.
Early stage is nearly all DPSSL to the laser for communication experiment of diving, and is typically all by blue green light external modulation
Method modulates continuous or pulse blue green light with external modulator, generate optical signal.But due to modulating the transferring of bluish-green optical band
The modulation bandwidth of device (such as Pockers cell and acousto-optic modulator) processed is relatively low, and generally requires drivings more than hundreds of volts electricity
Pressure, application in this way be greatly limited.Infrared light external modulation adds wavelength conversion method that can solve the problems, such as this.
This method generates high speed, powerful infrared signal using ripe infrared band photoelectric device, then through frequency-doubling crystal handle
Infrared signal is converted to green light.Although this method can obtain higher modulation rate and luminous power, system is extremely complex,
Need the discrete optical device such as more image intensifer.
How simply and efficiently to generate at a high speed, optical signal high-power, that optical quality is excellent be current wireless light communication urgently
Problem to be solved.
Invention content
The technical problem to be solved by the present invention is to overcome deficiency of the prior art, provide a kind of based on directly modulation
The wireless light communication devices and methods therefor of DPSSL.
In order to solve the above technical problems, the solution of the present invention is：
A kind of wireless light communication device based on direct modulation DPSSL is provided, including transmitting end device and receiving end device；
It is characterized in that, the transmitting end device includes：First signal processor, first voltage amplifier, the first adjustable attenuator, partially
Press drive module, DPSSL and transmitting terminal lens；Wherein, the first signal processor, first voltage amplifier, the first adjustable damping
Device, bias drive module and DPSSL are sequentially connected, and the transmitting terminal and transmitting terminal lens of DPSSL is positioned opposite.
In the present invention, the DPSSL includes the LD, laser crystal and the frequency-doubling crystal that are located in same light path.
In the present invention, the transmitting terminal lens are convex lens, and the DPSSL is located at the beam collimation focus of transmitting terminal lens
Position.
In the present invention, the receiving end device includes：Receiving terminal lens, photodetector, second voltage amplifier, second
Adjustable attenuator and second signal processor；Wherein, photodetector, second voltage amplifier, the second adjustable attenuator and
Binary signal processor is sequentially connected, and photodetector and receiving terminal lens are positioned opposite.
In the present invention, the receiving terminal lens are convex lens, and the light beam that the photodetector is located at receiving terminal lens is accurate
Straight focal position.
In the present invention, the transmitting end device and receiving end device of the wireless light communication device are respectively provided with pressure-resistant seal portion
Part；First signal processor of the transmitting end device, first voltage amplifier, the first adjustable attenuator, bias drive module,
DPSSL and transmitting terminal lens are mounted in the first pressure-resistant seal component；Wherein, transmitting terminal lens are set on the first pressure-resistant seal component
Cavity in and the first pressure-resistant seal component wall be equipped with can transmission laser glass window or transmitting terminal lens embedded in the
On the wall of one pressure-resistant seal component；Photodetector, second voltage amplifier, the second adjustable attenuator of the receiving end device
It is mounted in the second pressure-resistant seal component with second signal processor；Wherein, receiving terminal lens are set on the second pressure-resistant seal component
Cavity in and the second pressure-resistant seal component wall be equipped with can transmission laser glass window or receiving terminal lens embedded in the
On the wall of two pressure-resistant seal components.
Invention further provides the sides that the wireless light communication device based on directly modulation DPSSL realizes wireless light communication
Method, including step：
(1) the first signal processor in transmitting end device generates and sends out data-signal, which passes through first voltage
Bias drive module, bias drive module driving DPSSL are sent to after the amplification of amplifier and the attenuation of the first adjustable attenuator
In LD, the operating voltage of LD is made to be in the range of linearity, and electric signal is modulated on optical signal；Then it is sent out by DPSSL
Modulated optical signal is entering channel after transmitting terminal lens；
(2) modulated optical signal channel is transmitted to the receiving terminal lens in receiving end device, and photodetection is focused on by it
On device, the optical signal detected is converted into electric signal by photodetector, electric signal by second voltage amplifier amplification and
Second signal processor is sent to after the attenuation of second adjustable attenuator, second signal processor handles electric signal.
In the present invention, the process that the DPSSL sends out modulated optical signal includes：It is λ to bias drive module driving wavelength1's
LD makes the operating voltage of the LD be in the range of linearity；It is λ by the wavelength that the LD is sent out1Light for pumped laser crvstal, production
Raw wavelength is λ2Light；Finally by frequency-doubling crystal by the wavelength be λ2Light be changed into wavelength as λ3Light, λ2=2 × λ3。
Inventive principle describes：
In the present invention, the first signal processor is used to generating and sending out data-signal, first voltage amplifier and the second electricity
For being amplified processing to signal, the first adjustable attenuator and the second adjustable attenuator are used to decline to signal pressure amplifier
Subtract processing, second signal processor is used to receiving and handling data-signal.
Directly modulation DPSSL, which can retain directly modulation laser diode method and directly modulation light-emitting diodes light method, to be had
Realization it is simple the advantages of, and can overcome the shortcomings of them on optical quality and luminous power.Before the present invention proposes, if
Can be generated by the DPSSL that directly modulates the high speed (such as more than 300Mb/s) for wireless light communication, over long distances (such as
More than 100m) signal is not yet explored and studies, because the feasibility of directly modulation DPSSL was not once expected for a long time.Famous half
The researcher of conductor company OSRAM once pointed out, since the difficulty for directly modulating DPSSL maximums is that its modulation bandwidth is very low
(the upper energy level fluorescence lifetime of gain media is longer, therefore three dB bandwidth is generally in below 2MHz), it is impossible to by directly modulating
DPSSL generates the green optical signal that more than 10MHz is used for laser display.
Transmission rate is improved as much as possible in limited bandwidth to realize, can pass through profit in directly modulation DPSSL
With existing software radio thought and various Digital Signal Processings.For example, by using orthogonal frequency division multiplexi
(Orthogonal frequency division multiplexing, OFDM) dynamically distributes the bit information of high speed serialization
On the subcarrier overlapped to mutually orthogonal, frequency spectrum so that per sub-channels transmission characteristic can approximate ideal, each height
Higher order modulation formats can be used in carrier wave, effectively the spectrum efficiency and transmission rate of lifting system, realize that the wireless optical of high speed is led to
Letter.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, relative to the system complexity of transferring preparation method in the prior art height, and directly modulate laser diode method and directly
Light-emitting diodes light method is modulated the Shortcomings on optical quality and luminous power the defects of, the present invention has that peak power is high, light beam
It is high-quality, compact-sized, stability is good, realize it is simple the advantages that.
2nd, the present invention combines software radio thought and various Digital Signal Processings (such as OFDM technology) can be effective
Ground promotes the spectrum efficiency and transmission rate for directly modulating DPSSL systems, realizes the wireless optical transmission of information of high speed long range, tool
There are great researching value and wide application prospect.
Description of the drawings
Fig. 1 is the system framework figure based on the directly underwater wireless optical communication apparatus of modulation DPSSL in the present invention.
Fig. 2 is transmitting end device structure diagram in the present invention.
Fig. 3 is receiving end device structure diagram in the present invention.
Fig. 4 is the structure diagram of DPSSL.
Reference numeral in figure is：1 transmitting end device；10 first signal processors；11 first voltage amplifiers；12 first
Adjustable attenuator；13 bias drive modules；14DPSSL；15 transmitting terminal lens；2 receiving end devices；20 receiving terminal lens；21 light
Electric explorer；22 second voltage amplifiers；23 second adjustable attenuators；24 second signal processors.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Firstly the need of explanation, each electronic component (portion used in transmitting end device 1 and receiving end device 2 in the present invention
Part) it is mature technology, and have corresponding commercial product.Those skilled in the art understand the basis of application documents reading
On, the present invention can be reproduced completely according to the software radio knowledge of its grasp and various Digital Signal Processing technical ability.
A kind of underwater wireless optical communication apparatus based on directly modulation DPSSL as shown in Figure 1 includes 1 He of transmitting end device
Receiving end device 2 can utilize seawater channel to form radio optical communication system.Underwater wireless optical communication apparatus should include having sky
The pressure-resistant seal component of chamber.(if used as landline, pressure-resistant seal component certainly, is not needed to, need to only be replaced
It is changed to general case member.)
Transmitting end device 1 and receiving end device 2 in the present embodiment are respectively provided with pressure-resistant seal component.Wherein：
Transmitting end device 1 as shown in Fig. 2, including：The first signal processor 10 in the first pressure-resistant seal component,
First voltage amplifier 11, the first adjustable attenuator 12, bias drive module 13, DPSSL 14 and transmitting terminal lens 15；Wherein,
First signal processor 10, first voltage amplifier 11, the first adjustable attenuator 12, bias drive module 13, DPSSL 14 according to
Secondary to be connected, the transmitting terminal and transmitting terminal lens 15 of DPSSL 14 is positioned opposite, and DPSSL 14 is located at the light of transmitting terminal lens 15
Beam collimates focal position.Transmitting terminal lens 15 are set in the cavity of the first pressure-resistant seal component and the wall of the first pressure-resistant seal component
The glass window or transmitting terminal lens 15 for being equipped with energy transmission laser are embedded on the wall of the first pressure-resistant seal component.
Receiving end device 2 as shown in figure 3, including：Receiving terminal lens 20, photoelectricity in the second pressure-resistant seal component
Detector 21, second voltage amplifier 22, the second adjustable attenuator 23 and second signal processor 24；Wherein, photodetector
21st, second voltage amplifier 22, the second adjustable attenuator 23 and second signal processor 24 are sequentially connected, photodetector 21 with
Receiving terminal lens 20 are positioned opposite, and photodetector 21 is located at the beam collimation focal position of receiving terminal lens 20.Receiving terminal
Lens 20 are set in the cavity of the second pressure-resistant seal component and the wall of the second pressure-resistant seal component is equipped with the glass of energy transmission laser
Glass window or receiving terminal lens 20 are on the wall of the second pressure-resistant seal component.
Wherein, transmitting terminal lens 15 and receiving terminal lens 20 are convex lens.First signal processor 10 is used to generate simultaneously
Send out data-signal.Bias drive module 13 is used to drive the LD in DPSSL 14, and the operating voltage of LD is made to be in the range of linearity
It is interior, it realizes and electric signal is modulated on optical signal.First voltage amplifier 11 and second voltage amplifier 22 be used for signal into
Row enhanced processing.First adjustable attenuator 12 and the second adjustable attenuator 23 are used to carry out attenuation processing to signal.Second signal
Processor 24 is used to receiving and handling data-signal.
DPSSL 14 includes the LD, laser crystal and the frequency-doubling crystal that are located in same light path, and concrete structure can refer to figure
4.By taking the process that DPSSL 14 generates green light as an example：First, the LD that bias drive module driving wavelength is 808nm, makes the LD's
Operating voltage is in the range of linearity；Then, optical pumping laser crystal (such as neodymium-doped vanadium for being 808nm by the wavelength that the LD is sent out
Sour yttrium (Neodymium-Doped Yttrium Vanadate, Nd:YVO4) crystal) generate 1064nm infrared light；Finally, then
Infrared light is changed by frequency-doubling crystal (such as potassium titanium oxide phosphate (Potassium Titanyl Phosphate, KTP) crystal)
The green light of 532nm；Based on similar principles, DPSSL 14 can also generate blue light.
The carrying out practically flow of underwater wireless optical communication apparatus based on direct modulation DPSSL is：
The first signal processor 10 in transmitting end device 1 generates and sends out data-signal, which passes through first voltage
Bias drive module 13 is sent to after the amplification of amplifier 11 and the attenuation of the first adjustable attenuator 12, bias drive module 13 will
In the signal modulation to DPSSL 14, modulated optical signal is sent out by DPSSL 14, enters seawater channel after emitted end lens 15.
Modulated optical signal passes to the receiving terminal lens 20 in receiving end device 2 through seawater channel, is focused on photodetector 21 by it,
Photodetector 21 detects optical signal, and converts optical signals into electric signal, and electric signal is by second voltage amplifier 22
Second signal processor 24 is sent to after amplification and the attenuation of the second adjustable attenuator 23, carries out signal processing, it is complete in this way
Communication process is achieved that.
Finally it should be noted that listed above is only specific embodiments of the present invention.It is clear that the invention is not restricted to
Above example can also have many variations.Those of ordinary skill in the art can directly lead from present disclosure
All deformations for going out or associating, are considered as protection scope of the present invention.
Claims (7)
1. it is a kind of based on the wireless light communication device for directly modulating DPSSL, including transmitting end device and receiving end device；Its feature
It is, the transmitting end device includes：First signal processor, first voltage amplifier, the first adjustable attenuator, bias driving
Module, DPSSL and transmitting terminal lens；Wherein, the first signal processor, first voltage amplifier, the first adjustable attenuator, bias
Drive module and DPSSL are sequentially connected, and the transmitting terminal and transmitting terminal lens of DPSSL is positioned opposite；DPSSL includes being located at same
LD, laser crystal and frequency-doubling crystal in light path, the LD refer to laser diode, and DPSSL refers to laser diode-pumped
Solid state laser.
2. the apparatus according to claim 1, which is characterized in that the transmitting terminal lens are convex lens, and the DPSSL is located at
The beam collimation focal position of transmitting terminal lens.
3. device according to claim 1 or 2, which is characterized in that the receiving end device includes：Receiving terminal lens, light
Electric explorer, second voltage amplifier, the second adjustable attenuator and second signal processor；Wherein, photodetector, the second electricity
Pressure amplifier, the second adjustable attenuator and second signal processor are sequentially connected, photodetector cloth opposite with receiving terminal lens
It puts.
4. device according to claim 3, which is characterized in that the receiving terminal lens be convex lens, the photodetection
Device is located at the beam collimation focal position of receiving terminal lens.
5. device according to claim 3, which is characterized in that the transmitting end device of the wireless light communication device and reception
End device is respectively provided with pressure-resistant seal component；
The first signal processor, first voltage amplifier, the first adjustable attenuator, the bias driving mould of the transmitting end device
Block, DPSSL and transmitting terminal lens are mounted in the first pressure-resistant seal component；Wherein, transmitting terminal lens are set on the first pressure-resistant seal
In the cavity of component and glass window or transmitting terminal lens of the wall of the first pressure-resistant seal component equipped with energy transmission laser are embedding
In on the wall of the first pressure-resistant seal component；
Photodetector, second voltage amplifier, the second adjustable attenuator and the second signal processor of the receiving end device
In the second pressure-resistant seal component；Wherein, receiving terminal lens are set in the cavity of the second pressure-resistant seal component and second is resistance to
The wall of means of press seals component is equipped with the glass window of energy transmission laser or receiving terminal lens are embedded in the second pressure-resistant seal component
On wall.
6. a kind of method that wireless light communication device based on directly modulation DPSSL realizes wireless light communication, which is characterized in that packet
Include step：
(1) the first signal processor in transmitting end device generates and sends out data-signal, which amplifies by first voltage
Bias drive module is sent to after the amplification of device and the attenuation of the first adjustable attenuator, bias drive module is driven in DPSSL
LD makes the operating voltage of LD be in the range of linearity, and electric signal is modulated on optical signal；Then it is sent out by DPSSL modulated
Optical signal is entering channel after transmitting terminal lens；
(2) modulated optical signal channel is transmitted to the receiving terminal lens in receiving end device, is focused on photodetector by it,
The optical signal detected is converted into electric signal by photodetector, and electric signal can by the amplification and second of second voltage amplifier
Second signal processor is sent to after the attenuation of controlled attenuator, second signal processor handles electric signal.
7. according to the method described in claim 6, it is characterized in that, the process that the DPSSL sends out modulated optical signal includes：Partially
It is λ to press drive module driving wavelength1LD, the operating voltage of the LD is made to be in the range of linearity；It is λ by the wavelength that the LD is sent out1
Light for pumped laser crvstal, generation wavelength λ2Light；Finally by frequency-doubling crystal by the wavelength be λ2Light be changed into wave
A length of λ3Light, λ2=2 × λ3。
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| CN107302401B (en) * | 2017-06-17 | 2023-08-11 | 浙江大学 | Underwater wireless optical communication device and method based on wavelength division multiplexing technology |
| CN108964761B (en) * | 2018-07-02 | 2020-12-04 | 北京卫星信息工程研究所 | High-reliability space optical communication signal modulation terminal and method based on software radio |
| CN109212479A (en) * | 2018-09-12 | 2019-01-15 | 浙江大学 | Taking under a kind of plane environment can localization method |
| CN114362836B (en) * | 2021-11-29 | 2023-01-06 | 中国科学院西安光学精密机械研究所 | LED/LD array based transmitting-receiving integrated underwater wireless blue-green light communication method |
| CN114157370A (en) * | 2021-12-02 | 2022-03-08 | 浙江大学 | Collimating light path design method for increasing working distance of underwater wireless optical communication system |
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