CN106027162A - Optical communication system and method - Google Patents
Optical communication system and method Download PDFInfo
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- CN106027162A CN106027162A CN201610339490.7A CN201610339490A CN106027162A CN 106027162 A CN106027162 A CN 106027162A CN 201610339490 A CN201610339490 A CN 201610339490A CN 106027162 A CN106027162 A CN 106027162A
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/695—Arrangements for optimizing the decision element in the receiver, e.g. by using automatic threshold control
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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
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention provides an optical communication system and method. The optical communication system comprises a modulation device, an optical signal source, a single-photon PMT, and a demodulation device, wherein the modulation device is used for converting an original digital signal into an analog electrical signal, and sending the analog electrical signal to the optical signal source; the optical signal source is used for converting the analog electrical signal into an optical signal, and transmitting the optical signal; the single-photon PMT is used for receiving the optical signal, respectively converting photons in the received optical signal into electrical pulse signals, counting the electrical pulse signals which are obtained through conversion, obtaining the number of electrical pulses, and sending the number of the electrical pulses to the demodulation device; the demodulation device is used for outputting a first digital signal when a comparison result is that the number of the electrical pulses is larger than a preset judgment threshold, and outputting a second digital signal when the comparison result is that the number of the electrical pulses is smaller than the preset judgment threshold. The system and method provided by the invention have the advantage that the optical signal can travel for a longer distance in air, water, or transmission media of wireless channels other than air and water.
Description
Technical field
The application relates to optical communication field, particularly to a kind of optical communication system and method.
Background technology
At present, in air or water, the optic communication of optical signal is directly transmitted (such as visible light communication and laser
Communication) it is not subject to the influence of electromagnetic waves because of it, good communication quality, and by extensive concern and research.
But, optical signal can weaken along with the growth of transmission range, and the light in optical communication system connects
Receiving apparatus cannot receive low light signals, causes optical signal to carry out long range propagation relatively in air or water
For difficulty.
Summary of the invention
For solving above-mentioned technical problem, the embodiment of the present application provides a kind of optical communication system and method, to reach
Can carry out the purpose of the transmission of longer distance in atmosphere to optical signal, technical scheme is as follows:
A kind of optical communication system, including: modulating device, optical signal source, monochromatic light subtype photomultiplier tube
PMT and demodulating equipment；
Described modulating device, for being converted to analog electrical signal, and by described simulation by raw digital signal
The signal of telecommunication sends to described optical signal source；
Described optical signal source, for described analog electrical signal is converted to optical signal, and launches described light letter
Number；
Described monochromatic light subtype PMT, is used for receiving optical signal, each light in the optical signal that will receive
Son is respectively converted into electric impulse signal, counts the electric impulse signal being converted to, obtains electric pulse
Number, and described electric pulse number is sent to described demodulating equipment；
Described demodulating equipment, for relatively described electric pulse number and the size of default decision threshold, is comparing
When result is described electric pulse number more than described default decision threshold, exports the first digital signal, comparing
When result is described electric pulse number less than described default decision threshold, export the second digital signal, described the
One digital signal or described second digital signal are identical with the data message that described raw digital signal characterizes.
Preferably, described optical signal source includes: drive circuit and light emitting devices；
Described drive circuit, for being converted to optical signal by described analog electrical signal；
Described light emitting devices, is used for launching described optical signal.
Preferably, described light emitting devices is: fluorescent lamp.
Preferably, described light emitting devices is: electric filament lamp.
Preferably, described light emitting devices is: LED lamp.
Preferably, described light emitting devices is: semiconductor laser.
Preferably, described modulating device is binary system on off keying OOK modulating device；
Described demodulating equipment is OOK demodulating equipment.
Preferably, described modulating device is orthogonal frequency division multiplexi OFDM modulating device；
Described demodulating equipment is OFDM demodulation device.
A kind of optical communication method, including:
Raw digital signal is converted to analog electrical signal by modulating device, and is sent by described analog electrical signal
To optical signal source；
Described analog electrical signal is converted to optical signal by described optical signal source, and launches described optical signal；
Monochromatic light subtype PMT receives optical signal, and each photon in the optical signal that will receive is changed respectively
For electric impulse signal, the electric impulse signal being converted to is counted, obtain electric pulse number, and by institute
State electric pulse number to send to demodulating equipment；
Described demodulating equipment more described electric pulse number and the size of default decision threshold, at comparative result be
When described electric pulse number is more than described default decision threshold, exports the first digital signal, at comparative result be
When described electric pulse number is less than described default decision threshold, export the second digital signal, described first numeral
Signal or described second digital signal are identical with the data message that described raw digital signal characterizes.
Compared with prior art, the having the beneficial effect that of the application
In this application, monochromatic light subtype PMT is used to receive optical signal, due to single photon at receiving terminal
Type PMT can receive faint optical signal, and faint optical signal is converted to the signal of telecommunication, therefore uses
Monochromatic light subtype PMT receives optical signal, can expand the range of receiving of optical signal, so that optical signal
The transmission medium of other wireless channels in atmosphere or in water or in addition to air and water passes
Defeated distance is extended, with ensure optical signal can in atmosphere or in water or except air and water it
The transmission medium of other outer wireless channels carries out the transmission of longer distance.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present application, embodiment will be described below
The accompanying drawing used required in is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is only some embodiments of the application, for those of ordinary skill in the art, is not paying wound
On the premise of the property made is laborious, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of logical structure schematic diagram of the optical communication system that the application provides；
Fig. 2 is a kind of logical structure schematic diagram of the optical signal source that the application provides；
Fig. 3 is a kind of flow chart of the optical communication method that the application provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, to the technical scheme in the embodiment of the present application
It is clearly and completely described, it is clear that described embodiment is only that the application part is real
Execute example rather than whole embodiments.Based on the embodiment in the application, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into this
The scope of application protection.
Embodiment one
Refer to Fig. 1, it illustrates a kind of logical structure signal of the optical communication system that the application provides
Figure, optical communication system includes: modulating device 11, optical signal source 12, monochromatic light subtype PMT (photoelectricity times
Increase pipe, photomultiplier tube) 13 and demodulating equipment 14.
Modulating device 11, for being converted to analog electrical signal, and by described simulation electricity by raw digital signal
Signal sends to optical signal source 12.
Optical signal source 12, for described analog electrical signal is converted to optical signal, and launches described optical signal.
In the present embodiment, when the data message that raw digital signal characterizes is 1, by analog electrical signal
Be converted to comprise the optical signal of the photon of the first predetermined number；At the data message that raw digital signal characterizes
When being 0, analog electrical signal is converted to the signal of telecommunication comprising the photon of the second predetermined number.
Wherein, the first predetermined number is more than the second predetermined number.
Monochromatic light subtype PMT13, is used for receiving optical signal, each photon in the optical signal that will receive
It is respectively converted into electric impulse signal, the electric impulse signal being converted to is counted, obtain electric pulse number,
And described electric pulse number is sent to demodulating equipment 14.
In the present embodiment, the electric impulse signal being converted to is counted i.e. to the optical signal received
In each photon count.
Demodulating equipment 14, for relatively described electric pulse number and the size of default decision threshold, is comparing knot
Fruit be described electric pulse number be more than described default decision threshold time, export the first digital signal, comparing knot
Fruit be described electric pulse number when being less than described default decision threshold, exports the second digital signal, described first
Digital signal or described second digital signal are identical with the data message that described raw digital signal characterizes.
In the present embodiment, the first digital signal or second digital signal of demodulating equipment 14 output characterizes
The i.e. original data signal of data message characterize data message.
In the present embodiment, it is electric pulse number more than when presetting decision threshold at comparative result, explanation
The number of the photon received is more, then export what the first digital signal and the first digital signal characterized
Data message is 1；Being electric pulse number less than when presetting decision threshold at comparative result, explanation receives
The number of photon less, then export the second digital signal and data letter that the second digital signal characterizes
Breath is 0.
In the present embodiment, default decision threshold could be arranged to above-mentioned first predetermined number and second
The meansigma methods of predetermined number.
In this application, monochromatic light subtype PMT13 is used to receive optical signal, due to monochromatic light at receiving terminal
Subtype PMT13 can receive faint optical signal, and faint optical signal is converted to the signal of telecommunication, therefore
Use monochromatic light subtype PMT13 to receive optical signal, the range of receiving of optical signal can be expanded, so that
In the transmission medium of the optical signal other wireless channels in atmosphere or in water or in addition to air and water
The distance being transmitted is extended, to ensure that optical signal can be in atmosphere or in water or except air
With the transmission carrying out longer distance in the transmission medium of other wireless channels outside water.
In the present embodiment, the concrete structure of optical signal source 12 refers to Fig. 2, and optical signal source 12 wraps
Include: drive circuit 121 and light emitting devices 122.
Described drive circuit 121, for being converted to optical signal by described analog electrical signal；
Described light emitting devices 122, is used for launching described optical signal.
In the present embodiment, light emitting devices 122 is specifically as follows VISIBLE LIGHT EMISSION device or Laser emission
Device.
When light emitting devices 122 is VISIBLE LIGHT EMISSION device, light emitting devices 122 specifically can but not
It is confined to as fluorescent lamp；Or electric filament lamp；Or LED (light emitting diode, Light-Emitting Diode)
Lamp.
Wherein, LED is compared to fluorescent lamp and electric filament lamp, and switch switch speed is more preferable, and more
Energy-conservation and environmental protection.
When light emitting devices 122 is laser beam emitting device, light emitting devices 122 specifically can but not
It is confined to as semiconductor laser.
In above-mentioned optical communication system, modulating device 11 be specifically as follows OOK (binary system on off keying,
On-Off Keying)) modulating device, accordingly, demodulating equipment 14 is specially OOK demodulating equipment.
OOK modulating device uses OOK modulation technique that raw digital signal is converted to analog electrical signal；
OOK demodulating equipment uses the big of OOK modulation technique more described electric pulse number and default decision threshold
Little, when comparative result is described electric pulse number more than described default decision threshold, output the first numeral letter
Number, when comparative result is described electric pulse number less than described default decision threshold, output the second numeral letter
Number.
In above-mentioned optical communication system, modulating device 11 is specifically as follows OFDM (Orthogonal
Frequency Division Multiplexing, orthogonal frequency division multiplexi) modulating device, accordingly,
Demodulating equipment 14 is specially OFDM demodulation device.
OFDM modulating device uses OFDM modulation technique that raw digital signal is converted to analog telecommunications
Number；OFDM demodulation device uses OFDM modulation technique more described electric pulse number and default decision gate
The size of limit, when comparative result is described electric pulse number more than described default decision threshold, exports first
Digital signal, when comparative result is described electric pulse number less than described default decision threshold, exports second
Digital signal.
Certainly, modulating device 11 can also specially deform ACO-OFDM modulating device or
DCO-OFDM modulating device or PPM (pulse position modulation, Pulse Position Modulation)
Modulating device, accordingly, demodulating equipment 14 particularly as follows: deformation ACO-OFDM demodulating equipment or
DCO-OFDM demodulating equipment or PPM demodulating equipment.
Embodiment two
Corresponding with embodiment one, present embodiments provide a kind of optical communication method, refer to Fig. 3,
May comprise steps of:
Step S31: raw digital signal is converted to analog electrical signal by modulating device, and by described simulation
The signal of telecommunication sends to optical signal source.
Step S32: described analog electrical signal is converted to optical signal by optical signal source, and launches described light letter
Number.
Step S33: monochromatic light subtype PMT receives optical signal, each light in the optical signal that will receive
Son is respectively converted into electric impulse signal, counts the electric impulse signal being converted to, obtains electric pulse
Number, and described electric pulse number is sent to demodulating equipment.
Step S34: demodulating equipment more described electric pulse number and the size of default decision threshold.
It is electric pulse number more than when presetting decision threshold at comparative result, performs step S35, comparing knot
Fruit less than when presetting decision threshold, performs step S36 for electric pulse number.
Step S35: export the first digital signal.
Step S36: export the second digital signal.
In the present embodiment, the first digital signal or described second digital signal and described raw digital signal
The data message characterized is identical.
It should be noted that each embodiment in this specification all uses the mode gone forward one by one to describe,
What each embodiment stressed is the difference with other embodiments, between each embodiment
Identical similar part sees mutually.For device class embodiment, due to itself and method
Embodiment basic simlarity, so describe is fairly simple, relevant part sees the portion of embodiment of the method
Defend oneself bright.
Finally, in addition it is also necessary to explanation, in this article, the relation of such as first and second or the like
Term is used merely to separate an entity or operation with another entity or operating space, and not
Necessarily require or imply and there is the relation of any this reality or suitable between these entities or operation
Sequence.And, term " includes ", " comprising " or its any other variant are intended to nonexcludability
Comprise, so that include that the process of a series of key element, method, article or equipment not only include
Those key elements, but also include other key elements being not expressly set out, or also include for this
The key element that process, method, article or equipment are intrinsic.In the case of there is no more restriction,
The key element limited by statement " including ... ", it is not excluded that including the process of described key element, side
Method, article or equipment there is also other identical element.
Above a kind of optical communication system provided herein and method are described in detail, herein
In apply specific case principle and the embodiment of the application be set forth, above example
Explanation be only intended to help and understand the present processes and core concept thereof；Simultaneously for ability
The those skilled in the art in territory, according to the thought of the application, in specific embodiments and applications
All will change, in sum, this specification content should not be construed as the restriction to the application.
Claims (9)
1. an optical communication system, it is characterised in that including: modulating device, optical signal source, monochromatic light
Subtype photomultiplier tube PMT and demodulating equipment；
Described modulating device, for being converted to analog electrical signal, and by described simulation by raw digital signal
The signal of telecommunication sends to described optical signal source；
Described optical signal source, for described analog electrical signal is converted to optical signal, and launches described light letter
Number；
Described monochromatic light subtype PMT, is used for receiving optical signal, each light in the optical signal that will receive
Son is respectively converted into electric impulse signal, counts the electric impulse signal being converted to, obtains electric pulse
Number, and described electric pulse number is sent to described demodulating equipment；
Described demodulating equipment, for relatively described electric pulse number and the size of default decision threshold, is comparing
When result is described electric pulse number more than described default decision threshold, exports the first digital signal, comparing
When result is described electric pulse number less than described default decision threshold, export the second digital signal, described the
One digital signal or described second digital signal are identical with the data message that described raw digital signal characterizes.
Optical communication system the most according to claim 1, it is characterised in that described optical signal source bag
Include: drive circuit and light emitting devices；
Described drive circuit, for being converted to optical signal by described analog electrical signal；
Described light emitting devices, is used for launching described optical signal.
Optical communication system the most according to claim 2, it is characterised in that described light emitting devices
For: fluorescent lamp.
Optical communication system the most according to claim 2, it is characterised in that described light emitting devices
For: electric filament lamp.
Optical communication system the most according to claim 2, it is characterised in that described light emitting devices
For: LED lamp.
Optical communication system the most according to claim 2, it is characterised in that described light emitting devices
For: semiconductor laser.
7. according to the optical communication system described in claim 1-6 any one, it is characterised in that described
Modulating device is binary system on off keying OOK modulating device；
Described demodulating equipment is OOK demodulating equipment.
8. according to the optical communication system described in claim 1-6 any one, it is characterised in that described
Modulating device is orthogonal frequency division multiplexi OFDM modulating device；
Described demodulating equipment is OFDM demodulation device.
9. an optical communication method, it is characterised in that including:
Raw digital signal is converted to analog electrical signal by modulating device, and is sent by described analog electrical signal
To optical signal source；
Described analog electrical signal is converted to optical signal by described optical signal source, and launches described optical signal；
Monochromatic light subtype PMT receives optical signal, and each photon in the optical signal that will receive is changed respectively
For electric impulse signal, the electric impulse signal being converted to is counted, obtain electric pulse number, and by institute
State electric pulse number to send to demodulating equipment；
Described demodulating equipment more described electric pulse number and the size of default decision threshold, at comparative result be
When described electric pulse number is more than described default decision threshold, exports the first digital signal, at comparative result be
When described electric pulse number is less than described default decision threshold, export the second digital signal, described first numeral
Signal or described second digital signal are identical with the data message that described raw digital signal characterizes.
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| CN201610339490.7A CN106027162A (en) | 2016-05-20 | 2016-05-20 | Optical communication system and method |
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| CN201610339490.7A CN106027162A (en) | 2016-05-20 | 2016-05-20 | Optical communication system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107101732A (en) * | 2017-04-20 | 2017-08-29 | 华南师范大学 | A kind of software photon correlator and its measuring method |
| CN109150313A (en) * | 2018-08-15 | 2019-01-04 | 上海霍普光通信有限公司 | A kind of optical signal transmission method of low rate optical transmitter and receiver |
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| CN102638301A (en) * | 2012-03-23 | 2012-08-15 | 中国科学院西安光学精密机械研究所 | Device and method for modulating and demodulating optical signal in space optical communication |
| US20130062525A1 (en) * | 2011-09-12 | 2013-03-14 | Siemens Medical Solutions Usa, Inc. | Positron Emission Tomography Block Detector Interconnect |
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| CN101285715A (en) * | 2008-05-06 | 2008-10-15 | 中国科学院上海光学精密机械研究所 | Weak pulse optical signal detection device and detection method |
| CN101650228A (en) * | 2009-09-21 | 2010-02-17 | 安徽问天量子科技股份有限公司 | Gigahertz impulse gate-control low-pass filtering ultrared single-photon detector |
| US20130062525A1 (en) * | 2011-09-12 | 2013-03-14 | Siemens Medical Solutions Usa, Inc. | Positron Emission Tomography Block Detector Interconnect |
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| CN107101732A (en) * | 2017-04-20 | 2017-08-29 | 华南师范大学 | A kind of software photon correlator and its measuring method |
| CN109150313A (en) * | 2018-08-15 | 2019-01-04 | 上海霍普光通信有限公司 | A kind of optical signal transmission method of low rate optical transmitter and receiver |
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Application publication date: 20161012 |