CN105680980A - Coherent light digital communication method applied to field of optical communication processing - Google Patents
Coherent light digital communication method applied to field of optical communication processing Download PDFInfo
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- CN105680980A CN105680980A CN201610111837.2A CN201610111837A CN105680980A CN 105680980 A CN105680980 A CN 105680980A CN 201610111837 A CN201610111837 A CN 201610111837A CN 105680980 A CN105680980 A CN 105680980A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/002—Coherencemultiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0213—Groups of channels or wave bands arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
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Abstract
The invention discloses a coherent light digital communication method applied to the field of optical communication processing. The coherent light digital communication method comprises the following steps of (1), setting up a communication system for performing the coherent light digital communication method; (2), debugging the system, and debugging system parameters of each hardware till the system is in the best state after the step (1); (3), modulating a light-modulated signal, and generating the light-modulated signal according with requirements by utilizing a transmitting system in the communication system; and (4), recovering the light-modulated signal, reducing the light-modulated signal into a digital signal by utilizing a receiving system in the communication system, then, transmitting the digital signal into terminal equipment, and performing information reduction processing of the digital signal. The coherent light digital communication method designed based on a coherent modulation and heterodyne detection technology can be used for rapidly transmitting a signal to be transmitted in an undistorted manner; and the coherent light digital communication method has the advantages of being high in sensitivity and good in selectivity.
Description
Technical field
The present invention relates to optical communication processing technology field, specifically, it is a kind of coherent light digital communication method being applied to optical communication process field.
Background technology
Optical communication is one of communication modes of applying the earliest of the mankind. Transmit signal from flames of war, to communication modes such as signal lamp semaphores, it is all the category of optical communication. But owing to being subject to all multifactor restrictions such as sighting distance atmospheric attenuation landform stop, the slower development of optical communication.
Until nineteen sixty, American scientist Maiman has invented in the world after first laser apparatus, for optical communication provides good light source. More than 20 year subsequently, optical transmission medium was tackled key problems by people, had finally made low loss fiber, thus had established the foundation stone of optical communication. From then on, optical communication enters the stage of develop rapidly.
Optical Fiber Transmission has many outstanding advantages:
1. frequency band width
The width of frequency band represents the size of transmission capacity. The frequency of carrier wave is more high, it is possible to the frequency span of transmission signal is more big. In VHF frequency range, carrier frequency is 48.5MHz～300Mhz. Bandwidth is about 250MHz, can only transmit 27 cover TVs and tens cover FM broadcast. The frequency of visible ray reaches 100000GHz, exceeds more than 100 ten thousand times than VHF frequency range. Although owing to the light of different frequency is had different losses by optical fiber, making frequency span be affected, but the frequency span in lowest loss district also can reach 30000GHz. The bandwidth of current single source only account for a wherein very little part (frequency band about several hundred megahertz of multimode optical fibers, good single-mode fiber can reach more than 10GHz), adopt advanced coherent light communication can arrange 2000 light carriers within the scope of 30000GHz, carry out wavelength-division multiplex, it is possible to hold up to a million channels.
2. loss is low
In the system of concentric cable composition, best cable is when transmitting 800MHz signal, and the loss of every kilometer is all at more than 40dB. By contrast, the loss of photoconductive fiber is then much smaller, and the light of transmission 1.31um, if every kilometer of loss transmits the light of 1.55um at below 0.35dB, every kilometer of loss is less, can reach below 0.2dB.This is just little than the power loss of concentric cable 100,000,000 times so that it is the distance that can transmit wants much far away. In addition, fiber transmission attenuation also has two features, and one is have identical loss in whole cable television channels, it is not necessary to the equalizer that must induce one as cable main line carries out equilibrium; Two is that its loss does not almost become with temperature, does not worry causing the fluctuation of main line level because of variation of ambient temperature.
3. weight is light
Because optical fiber is very thin, single-mode fiber core line diameter is generally 4um～10um, external diameter also only has 125um, add waterproof layer, stiffening web, sheath etc., it is less than 13mm with the optic cable diameter of 4～48 optical fiber compositions, more much smaller than the diameter 47mm of standard coaxial cable, add that optical fiber is glass fibre, proportion is little, makes it have diameter feature little, lightweight, installs very convenient.
4. immunity from interference is strong
Because the basal component of optical fiber is quartz, only passing light, do not conduct electricity, not by the effect of electromagnetic field, the optical signal transmitted wherein is not by the impact of electromagnetic field, therefore electromagnetic interference, man-made interference are had very strong defensive ability/resistance ability by Optical Fiber Transmission. Also Just because of this, the signal transmitted in a fiber is not easily ravesdropping, and is thus beneficial to secrecy.
5. fidelity of reproduction height
Because Optical Fiber Transmission does not generally need relaying to amplify, new non-linear distortion can not be introduced because of amplifying. If the good linearity of laser apparatus, so that it may with high fidelity transmitting television signals. Actual test shows, three beats of the carrier combination of good amplitude modulation fibre system at more than 70dB than C/CTB, are handed over and adjusted index cM also at more than 60dB, far above the non-linear distortion index of general cable trunk line system.
6. reliable working performance
It is known that the reliability of a system is relevant with the number of devices of this system of composition. Equipment is more many, occurs the chance of fault more big. Because the number of devices that fibre system comprises few (not needing tens amplifiers as cable system), reliability is naturally also just high, add that the life-span of fiber plant is all very long, time between failures reaches 500,000～750,000 hours, what wherein the life-span was the shortest is the laser apparatus in optical sender, and least life is also more than 100,000 hours. Therefore the serviceability of the fibre system of good, the correct installation and debugging of design is very reliable.
7. cost constantly declines
At present, it has been proposed that new Moore's Law, optical laws (OpticalLaw) also it is called. This law is pointed out, the bandwidth of Optical Fiber Transmission information, within every 6 months, increases by 1 times, and price reduction 1 times. The development of optical communication technique, for extraordinary basis has been established in the development of Internet broadband technology. This is just for large-scale jeep adopts Optical Fiber Transmission mode to clear away last obstacle. Very abundant owing to making material (quartz) source of optical fiber, along with the progress of technology, cost also can reduce further; And copper raw material needed for cable is limited, price can be more and more higher. Obviously, Optical Fiber Transmission will have comparative advantage from now on, become set up the whole province, so that the main transmission media of national cable TV network.
Laser is the most perfect light source of optical communication. Now, it is possible to produce multiple laser apparatus, the laser of multiple power and wavelength can be produced.
Owing to laser is the luminescence phenomenon based on the light amplification of stimulated radiation, compare with the common light source based on spontaneous radiation, there is many salient features.
1. monochromaticity is good
It is known that the light of different colours has different wavelength.So-called monochromatic ray, actual is one section of radiation that wavelength region is very little. Line width more narrow (namely wavelength region is more little), the monochromaticity of light is more good. It should be noted that, line width here is the wavelength region that unmodulated front laser comprises, and it is two different concepts from the frequency span after Laser Modulation. Line width before modulation is more narrow, and the frequency span that can effectively utilize after modulation is more wide.
Because laser is the stimulated radiation produced after realizing population inversion between particular level, again through the frequency-selecting effect of resonator cavity so that it is the line width exporting light is very little, namely has good monochromaticity.
Utilize the monochromaticity of laser good, spectral resolution height, can be used to the fine structure of energy level and the spectrum studying material, make error in a year and be no more than the regulator of a microsecond.
2. good directionality
The angle of divergence that we use up usually is to describe its directivity, and the angle of divergence is more little, and directivity is more good. Searchlight best in common light source, its angle of divergence is 0.1rad (radian). If it is irradiated on the moon of 400,000 kilometers, liftoff ball (this is actual is impossible), its spot diameter has several ten thousand kilometers. In the laser, owing to the direction of excited atom luminescence is identical with external light, add resonator cavity and only allow the light along axis propagation to be amplified, make the directivity of Output of laser fine, the angle of divergence can reach 10rad, and it is irradiated on the moon, and spot diameter is less than 2km. Utilize the good directionality of laser, can be used for range finding, location, navigation etc.
3. brightness height
Owing to laser apparatus can accomplish interrupted luminescence, can accumulate and happen suddenly out more to a certain extent, thus there is very high power, maximum reach 10W, add the good directionality of laser, making its brightness extremely high, also exceed more than one hundred billion doubly than the brightness of the sun, only the strong flash of light of hydrogen bomb instant of detonation could by comparison. Utilize the high brightness of laser, it is possible to produce the high temperature of more than 100,000 degree at subrange, carry out punching, weld, perform the operation and controllable thermonuclear reaction etc.
4. coherency is good
So-called coherency refers to that two-beam can interfere, and forms the characteristic of stable light and dark interference image. The light sent due to stimulated radiation atom is all the same with external photon in frequency, position phase, vibration direction etc., makes laser have good coherency and is comparatively close to desirable, completely relevant hertzian wave. O.1m the coherence length that general monochromatic source sends light is no more than, but the coherence length of laser can reach tens kilometers. Here coherence length refers to and a branch of light is divided into two bundles, allows them through different distances, it is possible to produce the maximum optical path difference interfered. Utilize the coherency of laser good, it is possible to carry out holography, carry out precision measurement.
Modern optical networking main line length general longer (more than tens kilometers), and transmission channel is more, from system quality, reliability, and each side is considered economically, all should select amplitude modulation fibre system.
Summary of the invention
It is an object of the invention to design a kind of coherent light digital communication method being applied to optical communication process field, the coherent light digital designed with heterodyne Detection Technique based on relevant modulation communicates method, carrying out undistorted for signal to be transmitted, at a high speed can be transmitted, there is advantage highly sensitive, that selectivity is good.
The present invention is achieved through the following technical solutions: a kind of coherent light digital communication method being applied to optical communication process field, comprises the following steps:
1) communication system for carrying out coherent light digital communication method is built;
2) system debugging, after step 1), debugs the system parameter of each hardware, until optimum regime;
3) modulation treatment of modulated optical signal, utilizes the launching system in communication system to generate satisfactory modulated optical signal;
4) restoration disposal of modulated optical signal, utilizes the receiving system in communication system by modulated optical signal reduction treatment for numerary signal is then delivered in terminating unit, and the information reverting carrying out numerary signal processes.
Further to better implement the present invention, the following set-up mode of special employing: described communication system comprises launching system and receiving system, described launching system comprises light carrier and generates circuit, digital signal processing circuit, modulator and launch light matching box, and described receiving system comprises reception light matching box, frequency mixer, local oscillator laser apparatus, intermediate frequency amplifier, detuner, base band amplifier and judgement revivifier; Described modulator connects light carrier respectively and generates circuit, digital signal processing circuit and launch light matching box, described transmitting light matching box connects reception light matching box, described reception light matching box connects frequency mixer, intermediate frequency amplifier, detuner, base band amplifier and judgement revivifier successively, and described local oscillator laser apparatus connects frequency mixer.
Further to better implement the present invention, the following set-up mode of special employing: in described step 3), the modulation treatment of modulated optical signal comprises following concrete steps:
3-1) light carrier generates circuit evolving frequency stabilization, has the light carrier determining phase place;
3-2) through step 3-1) after, frequency stabilization, the numerary signal having the light carrier determining phase place and being generated by digital signal processing circuit in the modulator are modulated into modulated light;
3-3) through step 3-2) after, modulated light is transferred to launches in light matching box, launching in light matching box, the spatial distribution of modulated light is mated mutually with optical fiber base mould, the polarization state of modulated light is mated mutually with optical fiber polarization eigen state simultaneously, form modulated optical signal;
3-4) through step 3-3) after, the modulated optical signal after launching the process of light matching box will by Optical Fiber Transmission in receiving system.
Further to better implement the present invention, the following set-up mode of special employing: in described step 4), the restoration disposal of modulated optical signal comprises following concrete steps:
4-1) receiving light matching box receives by the modulated optical signal launching the output of light matching box, in reception light matching box, the spatial distribution of modulated optical signal is mated mutually with local oscillator optical signal with direction of polarization;
4-2) through step 4-1) after, through receive light matching box process after the modulated optical signal local oscillator optical signal mixing that will enter frequency mixer and local oscillator laser apparatus and produce, acquisition has the intermediate frequency signal of good mixing gain;
4-3) through step 4-2) after, the intermediate frequency signal that frequency mixer exports will carry out intermediate frequency amplification and filtering by intermediate frequency amplifier;
4-4) will be transported in detuner through intermediate frequency amplification and filtered intermediate frequency signal to carry out signal receiving, obtain baseband signal;
4-5) detuner gained baseband signal will be transported in base band amplifier to carry out amplifying and filtering process;
4-6) amplify and filtering process after baseband signal will be transported to judgement revivifier in carry out judgement regenerate, restore numerary signal, finally the numerary signal that this restores be delivered in terminating unit, to carry out information reverting.
Further to better implement the present invention, the following set-up mode of special employing: described frequency stabilization, the frequency with the light carrier determining phase place are identical with the frequency of the local oscillator optical signal that local oscillator laser apparatus produces.
The present invention compared with prior art, has the following advantages and useful effect:
The coherent light digital that the present invention designs based on relevant modulation and heterodyne Detection Technique communicates method, can be transmitted by carrying out undistorted for signal to be transmitted, at a high speed, have advantage highly sensitive, that selectivity is good.
Accompanying drawing explanation
Fig. 1 is launching system functional block diagram of the present invention.
Fig. 2 is receiving system functional block diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1:
A kind of coherent light digital communication method being applied to optical communication process field, comprises the following steps:
1) communication system for carrying out coherent light digital communication method is built;
2) system debugging, after step 1), debugs the system parameter of each hardware, until optimum regime;
3) modulation treatment of modulated optical signal, utilizes the launching system in communication system to generate satisfactory modulated optical signal;
4) restoration disposal of modulated optical signal, utilizes the receiving system in communication system by modulated optical signal reduction treatment for numerary signal is then delivered in terminating unit, and the information reverting carrying out numerary signal processes.
Embodiment 2:
The present embodiment is the basic enterprising one-step optimization at above-described embodiment, further to better implement the present invention, as shown in Figure 1 and Figure 2, the following set-up mode of special employing: described communication system comprises launching system and receiving system, described launching system comprises light carrier and generates circuit, digital signal processing circuit, modulator and launch light matching box, and described receiving system comprises reception light matching box, frequency mixer, local oscillator laser apparatus, intermediate frequency amplifier, detuner, base band amplifier and judgement revivifier; Described modulator connects light carrier respectively and generates circuit, digital signal processing circuit and launch light matching box, described transmitting light matching box connects reception light matching box, described reception light matching box connects frequency mixer, intermediate frequency amplifier, detuner, base band amplifier and judgement revivifier successively, and described local oscillator laser apparatus connects frequency mixer.
Embodiment 3:
The present embodiment is the basic enterprising one-step optimization at above-described embodiment, to better implement the present invention further, as shown in Figure 1 and Figure 2, and the following set-up mode of special employing: in described step 3), the modulation treatment of modulated optical signal comprises following concrete steps:
3-1) light carrier generates circuit evolving frequency stabilization, has the light carrier determining phase place;
3-2) through step 3-1) after, frequency stabilization, the numerary signal having the light carrier determining phase place and being generated by digital signal processing circuit in the modulator are modulated into modulated light;
3-3) through step 3-2) after, modulated light is transferred to launches in light matching box, launching in light matching box, the spatial distribution of modulated light is mated mutually with optical fiber base mould, the polarization state of modulated light is mated mutually with optical fiber polarization eigen state simultaneously, form modulated optical signal;
3-4) through step 3-3) after, the modulated optical signal after launching the process of light matching box will by Optical Fiber Transmission in receiving system.
Embodiment 4:
The present embodiment is the basic enterprising one-step optimization at above-described embodiment, to better implement the present invention further, as shown in Figure 1 and Figure 2, and the following set-up mode of special employing: in described step 4), the restoration disposal of modulated optical signal comprises following concrete steps:
4-1) receiving light matching box receives by the modulated optical signal launching the output of light matching box, in reception light matching box, the spatial distribution of modulated optical signal is mated mutually with local oscillator optical signal with direction of polarization;
4-2) through step 4-1) after, through receive light matching box process after the modulated optical signal local oscillator optical signal mixing that will enter frequency mixer and local oscillator laser apparatus and produce, acquisition has the intermediate frequency signal of good mixing gain;
4-3) through step 4-2) after, the intermediate frequency signal that frequency mixer exports will carry out intermediate frequency amplification and filtering by intermediate frequency amplifier;
4-4) will be transported in detuner through intermediate frequency amplification and filtered intermediate frequency signal to carry out signal receiving, obtain baseband signal;
4-5) detuner gained baseband signal will be transported in base band amplifier to carry out amplifying and filtering process;
4-6) amplify and filtering process after baseband signal will be transported to judgement revivifier in carry out judgement regenerate, restore numerary signal, finally the numerary signal that this restores be delivered in terminating unit, to carry out information reverting.
Embodiment 5:
The present embodiment is the basic enterprising one-step optimization at above-described embodiment, further to better implement the present invention, as shown in Figure 1 and Figure 2, the following set-up mode of special employing: described frequency stabilization, the frequency with the light carrier determining phase place are identical with the frequency of the local oscillator optical signal that local oscillator laser apparatus produces.
The above is only the better embodiment of the present invention, and the present invention not does any restriction in form, every above embodiment is done according to the technical spirit of the present invention any simple modification, equivalent variations, all fall within protection scope of the present invention.
Claims (5)
1. one kind is applied to the coherent light digital communication method of optical communication process field, it is characterised in that: comprise the following steps:
1) communication system for carrying out coherent light digital communication method is built;
2) system debugging, after step 1), debugs the system parameter of each hardware, until optimum regime;
3) modulation treatment of modulated optical signal, utilizes the launching system in communication system to generate satisfactory modulated optical signal;
4) restoration disposal of modulated optical signal, utilizes the receiving system in communication system by modulated optical signal reduction treatment for numerary signal is then delivered in terminating unit, and the information reverting carrying out numerary signal processes.
2. a kind of coherent light digital communication method being applied to optical communication process field according to claim 1, it is characterized in that: described communication system comprises launching system and receiving system, described launching system comprises light carrier and generates circuit, digital signal processing circuit, modulator and launch light matching box, and described receiving system comprises reception light matching box, frequency mixer, local oscillator laser apparatus, intermediate frequency amplifier, detuner, base band amplifier and judgement revivifier; Described modulator connects light carrier respectively and generates circuit, digital signal processing circuit and launch light matching box, described transmitting light matching box connects reception light matching box, described reception light matching box connects frequency mixer, intermediate frequency amplifier, detuner, base band amplifier and judgement revivifier successively, and described local oscillator laser apparatus connects frequency mixer.
3. a kind of coherent light digital communication method being applied to optical communication process field according to claim 2, it is characterised in that: in described step 3), the modulation treatment of modulated optical signal comprises following concrete steps:
3-1) light carrier generates circuit evolving frequency stabilization, has the light carrier determining phase place;
3-2) through step 3-1) after, frequency stabilization, the numerary signal having the light carrier determining phase place and being generated by digital signal processing circuit in the modulator are modulated into modulated light;
3-3) through step 3-2) after, modulated light is transferred to launches in light matching box, launching in light matching box, the spatial distribution of modulated light is mated mutually with optical fiber base mould, the polarization state of modulated light is mated mutually with optical fiber polarization eigen state simultaneously, form modulated optical signal;
3-4) through step 3-3) after, the modulated optical signal after launching the process of light matching box will by Optical Fiber Transmission in receiving system.
4. a kind of coherent light digital communication method being applied to optical communication process field according to claim 3, it is characterised in that: in described step 4), the restoration disposal of modulated optical signal comprises following concrete steps:
4-1) receiving light matching box receives by the modulated optical signal launching the output of light matching box, in reception light matching box, the spatial distribution of modulated optical signal is mated mutually with local oscillator optical signal with direction of polarization;
4-2) through step 4-1) after, through receive light matching box process after the modulated optical signal local oscillator optical signal mixing that will enter frequency mixer and local oscillator laser apparatus and produce, acquisition has the intermediate frequency signal of good mixing gain;
4-3) through step 4-2) after, the intermediate frequency signal that frequency mixer exports will carry out intermediate frequency amplification and filtering by intermediate frequency amplifier;
4-4) will be transported in detuner through intermediate frequency amplification and filtered intermediate frequency signal to carry out signal receiving, obtain baseband signal;
4-5) detuner gained baseband signal will be transported in base band amplifier to carry out amplifying and filtering process;
4-6) amplify and filtering process after baseband signal will be transported to judgement revivifier in carry out judgement regenerate, restore numerary signal, finally the numerary signal that this restores be delivered in terminating unit, to carry out information reverting.
5. a kind of coherent light digital communication method being applied to optical communication process field according to claim 4, it is characterised in that: described frequency stabilization, the frequency with the light carrier determining phase place are identical with the frequency of the local oscillator optical signal that local oscillator laser apparatus produces.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938438A (en) * | 2009-06-30 | 2011-01-05 | 华为技术有限公司 | Optical signal generating and receiving methods and devices and optical transmission system |
| WO2014146236A1 (en) * | 2013-03-18 | 2014-09-25 | 华为技术有限公司 | Coherent optical communication device and method |
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- 2016-02-29 CN CN201610111837.2A patent/CN105680980A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938438A (en) * | 2009-06-30 | 2011-01-05 | 华为技术有限公司 | Optical signal generating and receiving methods and devices and optical transmission system |
| WO2014146236A1 (en) * | 2013-03-18 | 2014-09-25 | 华为技术有限公司 | Coherent optical communication device and method |
Non-Patent Citations (1)
| Title |
|---|
| 刘喜斌: "相干光通信", 《现代通信》 * |
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Application publication date: 20160615 |