CN106656325B - A kind of two-way free space laser communication system of the single light source of high speed - Google Patents

A kind of two-way free space laser communication system of the single light source of high speed Download PDF

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Publication number
CN106656325B
CN106656325B CN201611024044.3A CN201611024044A CN106656325B CN 106656325 B CN106656325 B CN 106656325B CN 201611024044 A CN201611024044 A CN 201611024044A CN 106656325 B CN106656325 B CN 106656325B
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optical
signal
space
receiving module
light
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CN106656325A (en
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高士明
王晓燕
冯湘莲
王天枢
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40Transceivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50Transmitters
    • H04B10/501Structural aspects
    • H04B10/503Laser transmitters

Abstract

The invention discloses a kind of two-way free space laser communication systems of the single light source of high speed.Base station downlink signal is modulated through electrooptic modulator and is generated, free space is incident on through the coupling of the first space-fiber coupling device, it is projected afterwards by the first optical antenna forward direction, after second optical antenna of terminal receives base station signal, it is incident in photo-coupler through second space-fiber coupling device coupling, second receiving module of a part of optical signals terminal, which detects, to be received, and downlink signal data are obtained;Another part optical signal is incident in reflective semiconductor optical amplifier, through reflective semiconductor optical amplifier erasing re-modulation, amplification and reflected light coupler, again through the original routing reverse retroeflection of the second optical antenna to base station, the optical signal of retroeflection is detected by the first receiving module of base station and is received, and obtains uplink signal data.The present invention can greatly improve the transmission rate of two-way free space laser communication system, reduce the complexity of communication equipment, have important practical significance to the two-way technology of Free-space Laser Communication of next-generation high speed long range.

Description

A kind of two-way free space laser communication system of the single light source of high speed
Technical field
The present invention relates to technology of Free-space Laser Communication, two-way freely empty more particularly, to a kind of single light source of high speed Between laser communication system.
Background technique
Free space laser communication system refers to using laser light wave as carrier, atmosphere as medium transmission voice, data, The optical communication system of the information such as image.Compared with traditional spatial microwave communication, it is logical that free space laser communication combines optical fiber The advantages of letter and microwave communication, had not only used a laser as carrier wave and has guaranteed big message capacity, high rate data transmission, but also using the logical of space Letter mode, freedom and flexibility, between mobile target, between fixed target, between mobile target and fixed target and it is some not It is preferably laid with the region of optical fiber, as between satellite and satellite, satellite and ground, satellite and aircraft, island, Hai Lu and rivers two sides Communication etc. etc. have great application potential;At civilian aspect, the bottleneck of mass data transfers is also badly in need of solving in the market Certainly.Free space laser communication is because its transmission belt is roomy, good concealment is not easy to be trapped, direction type is good, strong antijamming capability, body The advantages that product is small, light-weight, is the most competitive technological approaches of Space-based information transmission.
Base station and terminal require to load Laser emission/reception and automatic track aiming in traditional radio optical communication system Acquisition equipment increases the volume and weight of equipment and the complexity of technology to a certain extent.If using single light source As carrier wave, light source is placed on base station, then can remove the laser emitter and automatic track aiming acquisition equipment of terminal from, is mitigated Volume, weight and the power consumption of terminal device effectively reduce the application limitation of laser space communication system.Although having some sides Method can realize the transmission of two-way signaling under single light source, but universal transmission rate is lower, only up to mbit.
Summary of the invention
The object of the present invention is to provide a kind of two-way free space laser communication system of the single light source of high speed, Neng Goushi Now high speed free space laser communication.
The present invention is modulated as Corticofugal Modulation of Somatosensory device, reflective semiconductor optical amplifier as uplink using electrooptic modulator The transmitted in both directions of gigabit/second signal can be realized in device.The present invention is reducing the same of terminal device technology complexity and power consumption When, the space propagation of bidirectional high speed signal under single light source is realized, transmitted in both directions rate is substantially increased, is met empty at this stage Between laser communication technology develop needs.
The technical solution adopted by the present invention is that including base station and terminal:
Base station includes laser, the first Polarization Controller, the first signal source, electrooptic modulator, optical circulator, the first sky M- fiber coupling device, the first optical antenna and the first receiving module, laser is through the first Polarization Controller and electrooptic modulator Light input end connected by optical fiber, the input terminal of electrooptic modulator electricity and the first signal source pass through cable connection, Electro-optical Modulation Device output end is connected through optical circulator and the first space-fiber coupling device by optical fiber, optical circulator and the first receiving module It is connected by optical fiber, the first space-fiber coupling device and the first optical antenna are connected by space optical coupling;
Terminal includes the second optical antenna, second space-fiber coupling device, photo-coupler, second signal source, reflective Semiconductor optical amplifier and the second receiving module, the second optical antenna and second space-fiber coupling device pass through space optocoupler Close connection, photo-coupler respectively with second space-fiber coupling device, reflective semiconductor optical amplifier and the second receiving module It is connected by optical fiber, the electrical input of reflective semiconductor optical amplifier and second signal source pass through cable connection.
The optical signal that the laser of the base station issues is input to Electro-optical Modulation after the first Polarization Controller polarization is adjusted In device, the digital signal load-modulate of the first signal source to optical signal, is then transferred to through optical circulator by electrooptic modulator One space-fiber coupling device is coupled into after free space optical by the first optical antenna and positive injection.
After second optical antenna of the terminal receives the optical signal from the first optical antenna, through second space-light Fine coupling device coupling is incident in photo-coupler, and received a part of the second receiving module of the optical signals detection of photo-coupler connects It receives, obtains downlink signal data.
The received another part optical signal of photo-coupler is incident in reflective semiconductor optical amplifier, and optical signal is through reflecting Formula semiconductor optical amplifier wipes re-modulation, amplification and reflected light coupler, then couples through second space-fiber coupling device Free light space is gone back to, finally by the reverse retroeflection of the second optical antenna, the optical signal of retroeflection is successively received simultaneously by the first optical antenna It is coupled back into the first space-fiber coupling device, the first receiving module is output to from its Inverted Output end using optical circulator and visits It surveys and receives, obtain uplink signal data.
The optical signal received is wiped original width thereon by saturation amplification by the reflective semiconductor optical amplifier After being worth modulation intelligence, the electric signal that second signal source issues is modulated on the optical signal after erasing, and anti-through optical fiber after amplification It is emitted back towards space-fiber coupling device.
The present invention carries out the particularity of re-modulation using reflective semiconductor optical amplifier to the light carrier for having carried signal Can, using single light source as light carrier, while realizing the transmitted in both directions of downlink signal and uplink signal.
The transformat of the downlink signal and transmission rate by electrooptic modulator modulation type and highest modulation rate It determines, wherein transformat can be on-off keying signal or differential phase keying (DPSK) signal according to electrooptic modulator modulation type, pass Defeated rate is up to gigabit/sec.
The transmission rate of the uplink signal is determined by the highest modulation rate of reflective semiconductor optical amplifier, transmits lattice Formula is on-off keying signal, and transmission rate is up to gigabit/sec.
The transmission rate of the downlink signal is greater than the transmission rate of the uplink signal.
First receiving module uses photodetector.
Second receiving module is determined by electrooptic modulator modulation type: if electrooptic modulator modulation type is switch Keying signal, then the second receiving module uses photodetector;If electrooptic modulator modulation type is differential phase keying (DPSK) signal, Then the second receiving module is mainly made of the second Polarization Controller, phase-coded signal demodulator and photodetector, optical coupling Device output end is successively connect after the second Polarization Controller, phase-coded signal demodulator with photodetector, and photo-coupler is defeated Signal out is after the second Polarization Controller, then is input to photodetector after the demodulation of phase-coded signal demodulator and receives.
Transmission rate of the invention by base station portion electrooptic modulator and terminal part reflective semiconductor light amplification The highest modulation rate of device itself determines.Wherein for terminal part, the general highest modulation of reflective semiconductor optical amplifier Rate can at least reach gigabit/sec, so that the present invention is independently successively handled compared to existing modulation, amplification, reflection Construction module and mode (transmission rate of existing this structure is only mbit) improve transmission rate.
The beneficial effects of the present invention are:
The free space laser communication of two-way gigabit/sec can be achieved in the present invention, and transmission rate is high, and only needs single light Source can greatly improve the transmission rate of two-way free space laser communication system.
Terminal device of the present invention is small in size, low in energy consumption, complexity is low, meets at this stage to high speed free space laser communication The demand of system has important practical significance to the two-way technology of Free-space Laser Communication of next-generation high speed long range
Detailed description of the invention
Fig. 1 is the attachment structure schematic diagram of apparatus of the present invention.
Fig. 2 is a kind of structural schematic diagram of receiving module of apparatus of the present invention.
Fig. 3 is the structural schematic diagram of another receiving module of apparatus of the present invention.
Fig. 4 is the eye figure that downlink signal measures after the transmission of free space laser in the embodiment of the present invention.
Fig. 5 is the eye figure that uplink signal measures after the transmission of free space laser in the embodiment of the present invention.
In figure: 1 is laser, and 2 be the first Polarization Controller, and 3 be the first signal source, and 4 be electrooptic modulator, and 5 be the ring of light Shape device, 6 be the first space-fiber coupling device, and 7 be the first optical antenna, and 8 be the second optical antenna, and 9 be second space-light Fine coupling device, 10 be photo-coupler, and 11 be second signal source, and 12 be reflective semiconductor optical amplifier, and 13 receive for first Module, 14 be the second receiving module, and 15 be photodetector, and 16 be the second Polarization Controller, and 17 demodulate for phase-coded signal Device.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, intercommunication system of the present invention includes base station and terminal.
As shown in Figure 1, base station includes laser 1, the first Polarization Controller 2, the first signal source 3, electrooptic modulator 4, light Circulator 5, the first space-fiber coupling device 6, the first optical antenna 7 and the first receiving module 13, laser 1 are inclined through first Vibration controller 2 is connected with the light input end of electrooptic modulator 4 by optical fiber, the electrical input of electrooptic modulator 4 and the first signal Source 3 passes through optical fiber through optical circulator 5 and the first space-fiber coupling device 6 by cable connection, 4 output end of electrooptic modulator Connection, optical circulator 5 are connected with the first receiving module 13 by optical fiber, the first space-fiber coupling device 6 and the first optics day Line 7 is connected by space optical coupling.
As shown in Figure 1, terminal includes the second optical antenna 8, second space-fiber coupling device 9, photo-coupler 10, the Binary signal source 11, reflective semiconductor optical amplifier 12 and the second receiving module 14, the second optical antenna 8 and second space-light Fine coupling device 9 is connected by space optical coupling, photo-coupler 10 respectively with second space-fiber coupling device 9, reflective half Conductor image intensifer 12 is connected with the second receiving module 14 by optical fiber, the electrical input of reflective semiconductor optical amplifier 12 and Second signal source 11 passes through cable connection.
The optical signal that laser issues is input in electrooptic modulator after the first Polarization Controller polarization is adjusted, electric light tune Device processed is connect with the first signal source, and the output end of electrooptic modulator and the positive input of optical circulator connect, through optical circulator Positive output end be input to the first space-fiber coupling device and be coupled in free space optical, by the first optical antenna forward direction It projects, by the free space transmission of certain distance, then is received by the second optical antenna and pass through second space-fiber coupling dress It sets and is injected in photo-coupler after being coupled into optical fiber, a part of light is detected by the second receiving module and received, and obtains downlink signal number According to.
Another part light is input in reflective semiconductor optical amplifier, reflective semiconductor optical amplifier and second signal Source connection, optical signal is through reflective semiconductor optical amplifier erasing re-modulation, amplification and reflects by photo-coupler, then through second Space-fiber coupling device is coupled back into free space, through the reverse retroeflection of the second optical antenna, by the free space of certain distance Transmission, is received by the first optical antenna and passes through the first space-fiber coupling device and be coupled in optical fiber, after optical circulator It is exported from the Inverted Output end of optical circulator, is detected and received by the first receiving module, obtain uplink signal data.
As shown in Fig. 2, 12 modulation format of reflective semiconductor optical amplifier is on-off keying signal, described first is received Module 13 uses photodetector 15, i.e. the inverse output terminal mouth of optical circulator 5 is connect with photodetector 15.
As shown in Fig. 2, if the modulation format of electrooptic modulator 4 is on-off keying signal, first receiving module 14 Using photodetector 15, i.e. photo-coupler 10 a delivery outlet is connect with photodetector 15.
As shown in figure 3, described second receives mould if the modulation format of electrooptic modulator 4 is differential phase keying (DPSK) signal Block 14 is using the second Polarization Controller 16, phase-coded signal demodulator 17 and photodetector 15, i.e. the one of photo-coupler 10 A output end is connect after the demodulation of phase-coded signal demodulator 17 with photodetector 15 again after the second Polarization Controller 16.
In specific implementation of the invention, the various lasers of communication band are may be selected in laser, and optical antenna can be selected Existing various space light collimation devices and system, such as lens, optical telescope, electrooptic modulator, Polarization Controller, the ring of light Various business can be selected in shape device, space-fiber coupling device, reflective semiconductor optical amplifier, demodulator, photodetector Component.
The optical signals laser 1 of apparatus of the present invention provides, and downlink signal is loaded by electrooptic modulator 4, uplink signal It is loaded by reflective semiconductor optical amplifier 12, the first space-fiber coupling device 6 and second space-fiber coupling device 9 For the coupling of light between free space and optical fiber, the hair of the first optical antenna 7 and the second optical antenna 8 for free space optical It penetrates and receives.
For receiving module, such as Fig. 2, when the first receiving module and the second receiving module only have a photodetector 15, Reception for on-off keying signal detects;In Fig. 3, when the second receiving end is by the second Polarization Controller 16, phase code letter Number demodulator 17 and photodetector 15 are constituted, and the reception for differential phase keying (DPSK) signal detects.The selection of second receiving module That reception scheme depends on the Signal coding type that the first signal source 3 issues.
The embodiment of the present invention is as follows:
The present invention with the downstream differential phase shift keyed signal (DPSK) of 10 gigabit/sec of modulation transmissions and 1.25 gigabits/ Experimental verification is carried out for the upstream switch keying signal (OOK) of second.
Laser issues 1550 nanometers of light and is input in phase-modulator after Polarization Controller, phase-modulator and the The connection of one signal source, the first signal source generate the pseudo-random binary sequence of 10 gigabit/secs to simulate in practical application Modulated signal, and it is loaded into generation downstream differential phase shift keyed signal on phase-modulator, downstream differential phase shift keyed signal warp It crosses space-fiber coupling device and is coupled to free space, by the first optical antenna forward direction transmission, space propagation, the second optics day After line receives, then entered in 1:1 coupler by second space-fiber coupling device coupled back into optical fibers, a part of light is compiled through phase It is detected after the demodulation of code signal demodulator by photodetector, the downstream differential phase-shift keying (PSK) after free space transmission of detection The eye figure of signal is as shown in Figure 4.
Another part light is input to reflective semiconductor optical amplifier, generates 1.25 gigabit/secs by second signal source Pseudo-random binary sequence is loaded into generation upstream switch keying signal (OOK) on reflective semiconductor optical amplifier, reflection Upstream switch keying signal (OOK) enters space-fiber coupling device and is coupled to free space, is sent out by the first optical antenna forward direction It penetrates, after the reception of space propagation, the second optical antenna, by the first space-fiber coupling device coupled back into optical fibers by circulator It is detected after the output of Inverted Output end and with photodetector, the upstream switch keying signal after free space transmission of detection Eye figure is as shown in Figure 5.
The model SOA-RL-OEC-1550 of the reflective semiconductor optical amplifier of the embodiment of the present invention, volume are 12 lis About 200 grams of rice × 3 centimetres of 15 cm x, weight, since the modulation rate of its own is in 1.25 gigabit/secs or so, originally The attainable peak transfer rate of embodiment is also in 1.25 gigabit/secs or so.But it can be used in specific practical operation higher The reflective semiconductor optical amplifier of rate, therefore the peak transfer rate in structure of the invention application is without being limited thereto.
It can be seen that the technology of the present invention significant effect, can be used for two-way laser space communication, transmitted in both directions rate is high, And a light source is only needed to can be realized.

Claims (5)

1. a kind of two-way free space laser communication system of the single light source of high speed, including base station and terminal, it is characterised in that:
Base station includes laser (1), the first Polarization Controller (2), the first signal source (3), electrooptic modulator (4), optical circulator (5), the first space-fiber coupling device (6), the first optical antenna (7) and the first receiving module (13), laser (1) is through One Polarization Controller (2) is connected with the light input end of electrooptic modulator (4) by optical fiber, the electrical input of electrooptic modulator (4) With the first signal source (3) by cable connection, electrooptic modulator (4) output end is through optical circulator (5) and the first space-optical fiber coupling It attaches together and sets (6) by optical fiber connection, optical circulator (5) is connected with the first receiving module (13) by optical fiber, the first space-optical fiber Coupling device (6) is connected with the first optical antenna (7) by space optical coupling;
Terminal includes the second optical antenna (8), second space-fiber coupling device (9), photo-coupler (10), second signal source (11), reflective semiconductor optical amplifier (12) and the second receiving module (14), the second optical antenna (8) and second space-light Fine coupling device (9) is connected by space optical coupling, photo-coupler (10) respectively with second space-fiber coupling device (9), anti- It penetrates formula semiconductor optical amplifier (12) and is connected with the second receiving module (14) by optical fiber, reflective semiconductor optical amplifier (12) Electrical input and second signal source (11) pass through cable connection;
The optical signal that the laser (1) of the base station issues is input to electric light tune after the first Polarization Controller (2) polarization is adjusted In device (4) processed, electrooptic modulator (4) is by the digital signal load-modulate to optical signal of the first signal source (3), then through the ring of light Shape device (5) is transferred to the first space-fiber coupling device (6), is coupled into free sky through the first space-fiber coupling device (6) Between projected by the first optical antenna (7) is positive after light;
After the second optical antenna (8) of the terminal receives the optical signal from the first optical antenna (7), through second space- Fiber coupling device (9) coupling is incident in photo-coupler (10), the received a part of optical signals second of photo-coupler (10) Receiving module (14) detection receives, and obtains downlink signal data;The received another part optical signal of photo-coupler (10) is incident on In reflective semiconductor optical amplifier (12), optical signal wipes re-modulation, amplification simultaneously through reflective semiconductor optical amplifier (12) Reflected light coupler (10), then it is coupled back into free light space through second space-fiber coupling device (9), finally by the second light Antenna (8) reverse retroeflection is learned, the optical signal of retroeflection is successively received by the first optical antenna (7) and is coupled back into the first space-optical fiber Coupling device (6) is output to the first receiving module (13) detection from its Inverted Output end using optical circulator (5) and receives, obtains To uplink signal data;
The original amplitude modulation information of optical signal that the reflective semiconductor optical amplifier (12) will be received by being saturated amplification The electric signal that second signal source (11) issue is modulated on the optical signal after erasing, then amplifies back reflection and make the return trip empty m- light by erasing Fine coupling device.
2. a kind of two-way free space laser communication system of single light source of high speed according to claim 1, it is characterised in that: The transformat and transmission rate of the downlink signal determine by the modulation type and highest modulation rate of electrooptic modulator (4), Wherein transformat can be on-off keying signal or differential phase keying (DPSK) signal according to the modulation type of electrooptic modulator (4), pass Defeated rate is up to gigabit/sec;The transmission rate of the uplink signal by reflective semiconductor optical amplifier (12) most to a high-profile Rate processed determines that transformat is on-off keying signal, and transmission rate is up to gigabit/sec.
3. a kind of two-way free space laser communication system of single light source of high speed according to claim 2, it is characterised in that: The transmission rate of the downlink signal is greater than the transmission rate of the uplink signal.
4. a kind of two-way free space laser communication system of single light source of high speed according to claim 1, it is characterised in that: First receiving module (13) uses photodetector (15).
5. a kind of two-way free space laser communication system of single light source of high speed according to claim 1, it is characterised in that: Second receiving module (14) is determined by electrooptic modulator (4) modulation type:
If electrooptic modulator (4) modulation type is on-off keying signal, the second receiving module (14) uses photodetector (15);
If electrooptic modulator (4) modulation type is differential phase keying (DPSK) signal, the second receiving module (14) is mainly inclined by second Shake controller (16), phase-coded signal demodulator (17) and photodetector (15) composition, photo-coupler (10) output end according to It is secondary to be connect after the second Polarization Controller (16), phase-coded signal demodulator (17) with photodetector (15), photo-coupler (10) signal exported is input to light after the second Polarization Controller (16), then after phase-coded signal demodulator (17) demodulation Electric explorer (15) receives.
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CN108574533B (en) * 2018-03-09 2020-06-09 长春理工大学 Common-caliber laser communication optical transmitter and receiver based on optical phased array
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CN109104244A (en) * 2018-09-11 2018-12-28 北京邮电大学 A kind of multi-core optical fiber communication system and a kind of multi-core optical fiber communication means
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