CN110995342A - Water mist space laser communication device based on 1.7 mu m waveband modulation light source - Google Patents
Water mist space laser communication device based on 1.7 mu m waveband modulation light source Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 54
- 239000003595 mist Substances 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000013307 optical fiber Substances 0.000 claims abstract description 86
- 230000003287 optical effect Effects 0.000 claims abstract description 58
- 239000004065 semiconductor Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 12
- 239000004038 photonic crystal Substances 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 30
- 238000001228 spectrum Methods 0.000 claims description 7
- 229910052775 Thulium Inorganic materials 0.000 claims description 2
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012984 biological imaging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- -1 thulium ions Chemical class 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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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
- H04B10/504—Laser transmitters using direct 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
- H04B10/548—Phase or frequency modulation
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Abstract
A water mist space laser communication device based on a 1.7 mu m wave band modulation light source belongs to the field of space laser communication, and aims to solve the problem that the existing 1.5 mu m wave band space optical communication technology is easily interfered by the absorption of water vapor in water mist weather, and comprises a signal source, a semiconductor laser, an optical fiber amplifier, an optical isolator, a first optical circulator, a thulium-doped optical fiber, a photonic crystal optical fiber, an optical fiber coupler, a second optical circulator, an optical fiber Bragg grating, a first optical fiber collimator, a rain mist simulation cabin, an ultrasonic water mist generator, a second optical fiber collimator, a photoelectric detector, a signal demodulator and a computer; the invention provides a method for using a 1.7 mu m wave band for laser communication in foggy days, which can effectively reduce the absorption loss of the laser communication in the foggy days and improve the communication quality and efficiency compared with the 1.5 mu m wave band.
Description
Technical Field
The invention relates to a space laser communication waveband light source, in particular to a water mist space laser communication device based on a 1.7 mu m waveband modulation light source, and belongs to the field of space laser communication.
Background
The 1.7 mu m wave band laser (1650-1750nm) can be widely applied to the fields of biological imaging, laser medical treatment, polymer laser welding and processing, mid-infrared laser pumping source, organic matter micro-measurement and the like, and becomes one of the hot spots of novel light source research at home and abroad in recent years. In the field of spatial laser communication, 1.7 μm band laser communication modulation light sources are urgently needed to expand communication frequency bands and improve the spatial application range.
In the transmission spectrum of atmospheric air at a height of 10km altitude proposed by Hamid Hemmati, "Near-Earth Laser Communications," ChapterVIII, Section 2, the transmission of the 1.7 μm band is 7% higher than that of the 1.5 μm band. Although the blue-green light (450-570nm) has the absolute wavelength advantage in underwater communication, the problems of poor security, much stray light and the like exist when the blue-green light is applied to laser communication in water mist/rainy days. The 1.7 mu m wave band laser modulation signal source can be used as a near infrared light source to well avoid the problems. Meanwhile, the wave band light source can well solve the defects of the existing laser communication: 1) the shortage of communication frequency band: it can be known that the existing optical communication band (C + L band, 1530-1625nm) is relatively crowded and has limited capacity, which has not satisfied the requirement of high-speed information transmission in the future. Therefore, the development of the 1.7 mu m waveband light source can effectively relieve the problem of shortage of communication frequency bands; 2) spatial application performance is limited: as can be seen from FIG. 1, the 1.7 μm band is the valley between two water absorption peaks, so that the 1.7 μm band light source can reduce the scattering loss and the water absorption loss in the channel containing water mist or rain compared with the 1.5 μm band which is commonly used. In addition, the transmission characteristic of the 1.7-micron wave band light source in an atmospheric channel is slightly superior to that of the 1.5-micron wave band, so that the absorption loss in the channel can be effectively reduced, and the communication availability and quality of atmospheric Laser communication can be improved. 1.7 μm laser communication can extend the spatial application range. Therefore, 1.7 mu m wave band laser modulation signal generation and research on water mist transmission characteristics are very necessary, and the method has potential application value and strong practical significance.
Although research on a 1.7 mu m waveband broadband light source and a single-wavelength tunable light source has achieved certain results, certain experience can be provided in terms of laser structures, tuning mechanisms, and the like. However, there are many new problems to realize a 1.7 μm band laser modulation signal source, which mainly include 1) lack of high gain laser medium: in the past, the raman effect is considered to be used for realizing the generation of new-band laser. However, the raman effect requires a high power pump source with a suitable wavelength and is inconvenient to implement. 2) A corresponding communication modulator is absent. The invention therefore proposes a method for the generation of a 1.7 μm band modulated laser source. The generation of the 1.7 mu m optical modulation signal is realized by adopting a pump modulation technology based on the innovation on the laser structure. And the fog space laser transmission device is put forward and set up, and the superiority is proved.
Disclosure of Invention
The invention provides a water mist space laser communication device based on a 1.7 mu m waveband modulation light source, aiming at solving the problem that the existing 1.5 mu m waveband space optical communication technology is easily interfered by the absorption of water vapor in water mist weather.
The technical scheme adopted by the invention is as follows:
the water mist space laser communication device based on the 1.7 mu m wave band modulation light source is characterized by comprising a signal source, a semiconductor laser, a fiber amplifier, an optical isolator, a first optical circulator, a thulium-doped optical fiber, a photonic crystal optical fiber, an optical fiber coupler, a second optical circulator, an optical fiber Bragg grating, a first optical fiber collimator, a rain mist simulation cabin, an ultrasonic water mist generator, a second optical fiber collimator, a photoelectric detector, a signal demodulator and a computer;
the signal source is connected with the semiconductor laser, and the semiconductor laser, the optical fiber amplifier, the optical isolator and the port a of the first optical circulator are sequentially connected by optical fibers; the port b of the first optical circulator, the thulium-doped optical fiber, the photonic crystal optical fiber and the port g of the optical fiber coupler are sequentially connected through optical fibers; the port i of the optical fiber coupler is connected with the port f of the second optical circulator through an optical fiber, and the port d of the second optical circulator is connected with the port c of the first optical circulator through an optical fiber to form a ring cavity;
the e-port optical fiber of the second optical circulator is connected with the fiber Bragg grating, and the tail end of the tail fiber of the fiber Bragg grating is cut into an oblique angle; the ultrasonic water mist generator is connected with the mist simulation cabin; the h-port optical fiber of the optical fiber coupler is connected with the first beam collimator; collimated light passes through the fog simulation cabin and is coupled into the optical fiber by the second collimator, and the collimated light is transmitted by the optical fiber and then is received by the optical fiber type photoelectric detector to output an optical signal; the optical signal passes through a signal demodulator and is finally received by a computer.
The invention has the beneficial effects that:
1) the invention provides a method for using a 1.7 mu m wave band for laser communication in foggy days, which can effectively reduce the absorption loss of the laser communication in the foggy days and improve the communication quality and efficiency compared with the 1.5 mu m wave band.
2) The invention adopts all-fiber devices to make the device compact in structure, easy to install and adjust and good in stability. The back gain spectrum long wave part generated by TDF is inhibited by using a 'photonic band gap' mechanism of a specially-made photonic crystal fiber, the gain saturation effect of a 1.7 mu m wave band can be inhibited, and the light conversion efficiency of the laser in the 1.7 mu m wave band can be improved.
3) The invention adopts the synchronous pump modulation technology, can generate 1.7 mu m modulation signals with corresponding frequency, and does not need a modulator with 1.7 mu m wave band.
Drawings
FIG. 1: and (3) measuring the absorption coefficient of water molecules in the near infrared band.
FIG. 2: the invention discloses a schematic diagram of a water mist space laser communication device based on a 1.7 mu m wave band modulation light source.
FIG. 3: the invention relates to a spectrogram generated by a 1.7 mu m waveband communication modulation light source.
FIG. 4: the invention is a comparison graph of a 1.7 mu m wave band modulation signal and a pumping modulation signal.
FIG. 5: the optical power loss of the water mist transmission experiment at the wave band of 1.7 mu m is compared with that at the wave band of 1.55 mu m.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2, the water mist space laser communication device based on the 1.7 μm waveband modulation light source of the present invention includes a signal source 1, a semiconductor laser 2, a fiber amplifier 3, an optical isolator 4, a first optical circulator 5, a thulium-doped fiber 6, a photonic crystal fiber 7, a fiber coupler 8, a second optical circulator 9, a fiber bragg grating 10, a first fiber collimator 11, a rain mist simulation cabin 12, an ultrasonic water mist generator 13, a second fiber collimator 14, a photodetector 15, a signal demodulator 16, and a computer 17.
The signal source 1 is connected with the semiconductor laser 2 through a cable, and the semiconductor laser 2, the optical fiber amplifier 3, the optical isolator 4 and the port a of the first optical circulator 5 are sequentially connected through optical fibers. The port b of the first optical circulator 5, the thulium-doped optical fiber 6, the photonic crystal optical fiber 7 and the port g of the optical fiber coupler 8 are sequentially connected through optical fibers. An i port of the optical fiber coupler 8 is connected with an f port of the second optical circulator 9 through an optical fiber, and a d port of the second optical circulator 9 is connected with a c port of the first optical circulator 5 through an optical fiber to form a ring cavity. The e-port optical fiber of the second optical circulator 9 is connected with the fiber Bragg grating 10, and the tail fiber end of the fiber Bragg grating 10 is cut into an oblique angle of 8 degrees. The ultrasonic water mist generator 13 is connected with the mist simulation cabin 12. The h-port optical fiber of the optical fiber coupler 8 is connected with a first optical fiber collimator 11, and collimated light passes through a fog simulation cabin 12 and then is coupled into the optical fiber by a second collimator 14. The collimated light is transmitted through an optical fiber and the output optical signal is received by the optical fiber type photodetector 15. The optical signal passes through an optical signal demodulator 16 and is finally received by a computer 17.
The signal source 1 is a 1550nm signal source; the semiconductor laser 2 is a 1550nm waveband directly-tunable semiconductor laser; the optical fiber amplifier 3 is an erbium-doped optical fiber amplifier; the optical isolator 4 is used for unidirectional transmission of light; the first optical circulator 5 is a three-port optical circulator; the thulium-doped optical fiber 6 is a laser gain medium; the photonic crystal fiber 7 is used for inhibiting the ASE spectrum long wave part of the thulium-doped fiber; the optical fiber coupler 8 is an 90/10 optical fiber coupler; the second optical circulator 9 is a three-port optical circulator; the fiber Bragg grating 10 is a 1.7 mu m wave band uniform reflection type Bragg grating; the first optical fiber collimator 11 and the second optical fiber collimator 14 are used for beam expanding collimation of light beams; the fog simulation cabin 12 is used for simulating a fog environment; the ultrasonic water mist generator 13 is used for generating mist; the photoelectric detector 15 is used for detecting 1.7 μm signal light; the signal demodulator 16 is used for signal light data demodulation.
The working process of the water mist space laser communication device based on the 1.7 mu m wave band modulation light source is as follows:
the signal source 1 drives the semiconductor laser 2 to generate 1550nm waveband signal light, the signal light is subjected to power amplification through the optical fiber amplifier 3, the signal light is injected into the thulium-doped optical fiber 6 through the optical isolator 4 and the first optical circulator 5, and thulium ions in the thulium-doped optical fiber 6 are excited in a stimulated mode to enable the thulium-doped optical fiber to be driven from the optical fiber3H6Transition of energy level to3F4Energy level, resulting in a 1600nm to 2000nm broadband gain spectrum. Through the photonic band gap effect of the photonic crystal fiber 7, the long wave part of the thulium-doped fiber back-to-gain spectrum is inhibited, and the gain saturation effect of the 1.7 mu m wave band can be inhibited, so that the gain conversion efficiency of the 1.7 mu m wave band is improved. The resulting 1.7 μm band back gain spectrum is output from the c-port of the first optical circulator 5 and enters the d-port of the second optical circulator 9. The light is output from the e-port of the second optical circulator 9 to the fiber bragg grating 10 for wavelength selection of the 1.7 μm waveband, and the fiber bragg grating 10 reflects the light of the 1.7 μm waveband back to the e-port of the second optical circulator 9 and outputs from the f-port of the second optical circulator 9. Then, light is input from the i port of the optical fiber coupler 8, and 10% of 1.7 μm-band signal light is output from the h port of the optical fiber coupler 8. The remaining 90% of the light is output from the g-port of the fiber coupler 8 and circulates in the cavity. The generated 1.7 μm wave band signal light enters a first optical fiber collimator 11 for beam expanding and collimation, passes through a fog simulation cabin 12, is received by a second optical fiber collimator 14, and passes throughAfter passing through the detector 15, the signal is demodulated by a signal demodulator 16 into an electrical signal, which is finally received by a computer 17.
When the modulation frequency of the pump signal light is consistent with or integral multiple of the repetition frequency corresponding to the laser cavity length, 1.7 μm signal light output consistent with or integral multiple of the repetition frequency is generated. As shown in fig. 5, it can be seen that the resulting 1.7 μm output waveform and pulse width substantially correspond to the 1550nm pump waveform.
The 1.7 mu m wave band is a low valley between two water absorption peaks, so that the 1.7 mu m wave band light source reduces the absorption loss of water while reducing the scattering loss in a channel containing water fog or rain. Meanwhile, the transmission characteristic of the 1.7-micron wave band light source in an atmospheric channel is slightly better than that of the 1.5-micron wave band, so that the absorption loss in the channel can be effectively reduced, and the communication availability and quality of atmospheric laser communication are improved. Therefore, experiments show that the absorption loss of the 1.7 μm wave band signal light in the water mist is 4.5dB lower than that of the 1.5 μm wave band signal light in the water mist in the figure 5.
As shown in FIG. 3, the 1.7 μm band spectrum of the present invention shows a peak wavelength of 1727.74nm, a 3dB bandwidth of 0.18nm, and a side mode suppression ratio of 62 dB.
As shown in fig. 4, the 1.7 μm band modulated signal of the present invention is compared with the pump modulated signal. The 1.7 μm output waveform and pulse width were substantially identical to the pump waveform when the modulation frequency was matched to the fundamental frequency of 11.391MHz corresponding to the cavity length.
As shown in FIG. 5, the power loss of the 1.7 μm band modulation signal and the 1.5 μm pump modulation signal in the water mist transmission experiment of the present invention are compared. The absorption loss of the 1.7 mu m wave band signal light is 4.5dB lower than that of the 1.5 mu m wave band signal light in the water mist.
Claims (9)
1. A water mist space laser communication device based on a 1.7 mu m wave band modulation light source is characterized by comprising a signal source (1), a semiconductor laser (2), an optical fiber amplifier (3), an optical isolator (4), a first optical circulator (5), a thulium-doped optical fiber (6), a photonic crystal optical fiber (7), an optical fiber coupler (8), a second optical circulator (9), an optical fiber Bragg grating (10), a first optical fiber collimator (11), a rain mist simulation cabin (12), an ultrasonic water mist generator (13), a second optical fiber collimator (14), a photoelectric detector (15), a signal demodulator (16) and a computer (17);
the signal source (1) is connected with the semiconductor laser (2), and ports a of the semiconductor laser (2), the optical fiber amplifier (3), the optical isolator (4) and the first optical circulator (5) are sequentially connected through optical fibers; the port b of the first optical circulator (5), the thulium-doped optical fiber (6), the photonic crystal optical fiber (7) and the port g of the optical fiber coupler (8) are sequentially connected through optical fibers; an i port of the optical fiber coupler (8) is connected with an f port of the second optical circulator (9) through an optical fiber, and a d port of the second optical circulator (9) is connected with a c port of the first optical circulator (5) through an optical fiber to form an annular cavity;
an e-port optical fiber of the second optical circulator (9) is connected with an optical fiber Bragg grating (10), and the tail end of a tail fiber of the optical fiber Bragg grating (10) is cut into an oblique angle; the ultrasonic water mist generator (13) is connected with the mist simulation cabin (12); an h-port optical fiber of the optical fiber coupler (8) is connected with a first beam collimator (11), collimated light passes through a fog simulation cabin (12) and then is coupled into the optical fiber by a second collimator (14), and the collimated light is transmitted by the optical fiber and then is received by a photoelectric detector (15) to output an optical signal; the optical signal passes through a signal demodulator (16) and is finally received by a computer (17).
2. The method and the device for the mist space laser communication of the 1.7 μm waveband communication modulation light source according to the claim 1 are characterized in that the signal source (1) is a 1550nm waveband signal source.
3. The method and the device for the communication of the fog space laser of the 1.7 μm waveband communication modulation light source according to the claim 1 are characterized in that the semiconductor laser (2) is a 1550nm waveband directly-tunable semiconductor laser.
4. The method and the device for the mist space laser communication of the 1.7 μm waveband communication modulation light source according to the claim 1 are characterized in that the optical fiber amplifier (3) is an erbium-doped optical fiber amplifier.
5. The method and apparatus for fog space laser communication with 1.7 μm waveband communication modulation light source as claimed in claim 1, wherein the photonic crystal fiber (7) is used to suppress the long wave part above 1800nm of the back gain spectrum of thulium doped fiber.
6. The method and the device for the mist space laser communication of the 1.7 μm waveband communication modulation light source according to the claim 1, characterized in that the optical fiber coupler (8) is an 90/10 optical coupler.
7. The method and the device for the fog space laser communication of the 1.7 μm waveband communication modulation light source according to the claim 1 are characterized in that the tail end of the tail fiber of the fiber Bragg grating (10) is cut into an oblique angle of 8 degrees.
8. The method and device for the mist space laser communication of the 1.7 μm waveband communication modulation light source according to claim 1, wherein the fiber bragg grating (10) is a 1.7 μm waveband uniform reflection type bragg grating.
9. The method and device for the fog space laser communication of the 1.7 μm waveband communication modulation light source according to claim 1, wherein the photodetector (15) is a 1.7 μm waveband photodetector.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112066901A (en) * | 2020-08-27 | 2020-12-11 | 中国科学院上海光学精密机械研究所 | Ultrasonic adjustable spectrum interference measuring device and measuring method |
| CN112557346A (en) * | 2020-12-11 | 2021-03-26 | 长春理工大学 | Coherence-controllable 1.7-micron waveband non-diffraction light source biological imaging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112066901A (en) * | 2020-08-27 | 2020-12-11 | 中国科学院上海光学精密机械研究所 | Ultrasonic adjustable spectrum interference measuring device and measuring method |
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| CN112557346A (en) * | 2020-12-11 | 2021-03-26 | 长春理工大学 | Coherence-controllable 1.7-micron waveband non-diffraction light source biological imaging system |
| CN112557346B (en) * | 2020-12-11 | 2023-11-10 | 长春理工大学 | 1.7 mu m wave band non-diffraction light source biological imaging system with controllable coherence |
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