CN110556700A - MOPA underwater wireless optical communication transmitting device based on Manchester coding signals - Google Patents
MOPA underwater wireless optical communication transmitting device based on Manchester coding signals Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
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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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Abstract
The invention discloses an MOPA (metal oxide optical power amplifier) underwater wireless optical communication transmitting device based on Manchester coding signals, which comprises a signal processor for generating Manchester coding signals, wherein the signal processor is connected with an amplifier and an attenuator, the attenuator is connected with a bias driver, the bias driver drives a laser diode, optical signals generated by the laser diode are focused by a first convex lens and then coupled into an optical fiber isolator, the optical fiber isolator is connected with a pump beam combiner, the input end of the pump beam combiner is also connected with a pump laser, light emitted by the output end of the optical fiber isolator and pump light emitted by the pump laser are combined by the pump beam combiner and then enter a doped optical fiber, and the doped optical fiber is connected with a second convex lens, a third convex lens, a frequency doubling KTP (potassium titanate) crystal and a fourth convex lens. The invention can realize higher power output, reduce the complexity of a high-speed communication system and improve the communication rate of signals.
Description
Technical Field
The invention belongs to the technical field of underwater wireless optical communication, and particularly relates to a MOPA (metal oxide PA) underwater wireless optical communication transmitting device based on Manchester coded signals.
Background
Compared with the traditional acoustic communication technology, the optical communication technology can overcome the defects of narrow bandwidth, large environmental influence, low applicable carrier frequency, large transmission time delay and the like of underwater acoustic communication. Therefore, underwater wireless optical communication plays an important role in the fields of ocean exploration, ocean environment monitoring, ocean resource development and the like.
Underwater Wireless Optical Communication (UWOC) is a communication method that uses blue-green light as a communication carrier and water as a communication medium to communicate Underwater information.
At present, most underwater communication uses a blue-green light semiconductor laser diode, although the bandwidth is high and the transmission rate is high, the energy of the semiconductor laser diode is low, the sensitivity of a receiving end is required to be high, and the transmission distance is relatively short.
And a power amplifier (MOPA) laser of a master-controlled oscillator is a device for amplifying power of a low-power seed source laser by means of a fiber amplifier. The existing pulse-shaped MOPA fiber laser, for example, "pulse-shaped MOPA fiber laser based on electro-optical modulation" disclosed in chinese patent publication No. CN208111907U, is mainly to increase attenuation at high output, and the communication system formed by the pulse-shaped MOPA fiber laser is relatively complex and has a low communication rate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the MOPA underwater wireless optical communication transmitting device based on the Manchester coding signals, the invention overcomes the problem of lower output power of a blue-green laser diode in underwater optical communication, a mode of combining an MOPA laser and a frequency doubling crystal can be adopted to use a 1um laser diode with lower power, higher power output is realized, and the complexity of a high-speed communication system is reduced.
In order to achieve the purpose, the invention adopts the technical scheme that: a MOPA underwater wireless optical communication transmitting device based on Manchester coded signals is characterized in that: the optical fiber coupling device comprises a signal processor for generating Manchester coding signals, the signal processor is connected with an amplifier, the output end of the amplifier is connected with an attenuator, the attenuator is connected with a bias driver, the bias driver drives a laser diode, optical signals generated by the laser diode are coupled to the input end of an optical fiber isolator after being focused by a first convex lens, the output end of the optical fiber isolator is connected with a pump beam combiner, the input end of the pump beam combiner is also connected with a pump laser, pump light emitted by the output end of the optical fiber isolator and pump light emitted by the pump laser enter a doped optical fiber after being combined by the pump beam combiner, the output end of the doped optical fiber is connected with a second convex lens, the output end of the second convex lens is connected with a third convex lens, the output end of the third convex lens is connected with a frequency doubling KTP crystal, the frequency KTP crystal is connected with a fourth convex lens, light beams output by the doped optical fiber are focused by, the focused light beam is frequency-doubled by the frequency doubling crystal, and the frequency doubling light generates parallel light after being expanded by the fourth convex lens.
Furthermore, the Manchester coded signal generated by the signal processor reaches a linear range of the laser diode after being amplified by the amplifier and attenuated by the attenuator.
Further, the third convex lens is arranged at a position which is one focal length away from the output end of the doped optical fiber.
Further, the frequency doubling crystal is located at the focus of the third convex lens.
Further, the fourth convex lens is located at a position away from the frequency doubling crystal by one focal length.
Further, the doped fiber is a Yb-doped fiber or a Nd-doped fiber.
Further, the pump laser is any one of a 976nm pump source laser, a 915nm pump source laser, a 808nm pump source laser and a 880nm pump source laser.
Further, the frequency doubling crystal is any one of a KTP crystal, a KDP crystal, an LBO crystal and a BBO crystal.
Furthermore, 532nm high-transmittance films and 1064nm high-transmittance films are respectively plated at two ends of the frequency doubling crystal.
Further, the signal processor generates the Manchester coded signal by converting the '0' code in the information into a transition from low to high in level and converting the '1' code in the information into a transition from high to low in level.
By adopting the scheme, compared with the prior art, the invention has the beneficial effects that: compared with the blue-green light semiconductor laser diode which is commonly used at present, the MOPA and the frequency doubling can realize higher power output; the structure of the optical communication system is simplified, and a high-speed modulation system is realized; moreover, compared with a common pulse modulation MOPA communication structure, the Manchester coding signal can overcome the influence of long connection '1' or '0' on an amplification result, well solves the problem of code pattern distortion caused by structural energy storage in the optical fiber amplification process, realizes optical signal modulation under continuous light, fully utilizes the bandwidth of a laser, and improves the data transmission rate, thereby improving the signal-to-noise ratio of the whole communication system.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The embodiment of the invention is shown in fig. 1, which is a MOPA underwater wireless optical communication transmitting device based on manchester coded signals, and the device comprises a signal processing device 1, an amplifier 2, an attenuator 3, a bias driver 4, a laser diode 5, a first convex lens 6, an optical fiber isolator 7, a pump laser 8, a pump beam combiner 9, a doped optical fiber 10, a second convex lens 11, a third convex lens 12, a frequency doubling crystal 13 and a fourth convex lens 14.
The signal processing device 1 generates Manchester code signals, and the generating method comprises the following steps: the '0' code in the information is converted into the jump of the level from low to high, and the '1' code in the information is converted into the jump of the level from high to low.
The Manchester coded signal generated by the signal processing device 1 is amplified by the amplifier 2 and attenuated by the attenuator 3 to reach the linear interval of the operation of the laser diode 5. The bias driver 4 drives the laser diode, the laser diode 5 generates optical signals which are focused by the first convex lens 6, and the optical signals are coupled into the input end optical fiber of the optical fiber isolator 7 after being focused. The optical fiber isolator 7 can prevent the retro-reflected laser from damaging the seed source, and the optical fiber isolator 7 isolates the optical signal and then combines the optical signal with the pump light emitted by the pump source laser through the pump beam combiner 9 to enter the doped optical fiber 10. The first convex lens 6 described above may be replaced with any lens group structure that satisfies the requirement of coupling laser light into the input end optical fiber of the fiber isolator 7. The doped fiber 10 may be a Yb-doped fiber or a Nd-doped fiber with any core diameter, and a beam isolator may be added to the end of the fiber, and in this embodiment, the Yb-doped fiber is used to amplify the signal light. The pump laser 8 can be a 976nm pump source laser, a 915nm pump source laser, a 808nm pump source laser, or a 880nm pump source laser, and preferably a 976nm pump source laser is used.
The light beam output by the doped optical fiber 10 is subjected to light beam expansion through the second convex lens 11 and then is focused and amplified by the third convex lens 12 to improve the frequency doubling efficiency; the focused light beam is frequency-doubled by the frequency doubling crystal 13, and the frequency doubling light generates parallel light after being expanded by the fourth convex lens 14, so that the long-distance underwater optical communication application is met. The frequency doubling crystal 13 is preferably a KTP crystal, and can also be replaced by a KDP crystal, an LBO crystal and a BBO crystal. 532nm and 1064nm high-permeability films are plated at two ends of the frequency doubling crystal 13, so that the frequency doubling effect is improved.
The second lens 11 is placed at a distance from the output end of the doped fiber 10 by the focal length of the second lens 11, and couples the laser light emitted from the laser diode 5 into the input end of the isolator 6. The third convex lens 12 should be disposed at a position away from the output end of the doped fiber 10 by a focal length to ensure that the laser beam is expanded into parallel light after passing through the third convex lens 12. The frequency doubling crystal 13 should be located at the focus of the third convex lens 12 to ensure maximum frequency doubling efficiency. The fourth convex lens 14 should be located at a focal length from the frequency doubling crystal to ensure output of parallel narrow beams and guarantee underwater transmission distance.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention.
Claims (9)
1. A MOPA underwater wireless optical communication transmitting device based on Manchester coded signals is characterized in that: the optical fiber coupling device comprises a signal processor for generating Manchester coding signals, the signal processor is connected with an amplifier, the output end of the amplifier is connected with an attenuator, the attenuator is connected with a bias driver, the bias driver drives a laser diode, optical signals generated by the laser diode are coupled to the input end of an optical fiber isolator after being focused by a first convex lens, the output end of the optical fiber isolator is connected with a pump beam combiner, the input end of the pump beam combiner is also connected with a pump laser, pump light emitted by the output end of the optical fiber isolator and pump light emitted by the pump laser enter a doped optical fiber after being combined by the pump beam combiner, the output end of the doped optical fiber is connected with a second convex lens, the output end of the second convex lens is connected with a third convex lens, the output end of the third convex lens is connected with a frequency doubling KTP crystal, the frequency KTP crystal is connected with a fourth convex lens, light beams output by the doped optical fiber are focused by, the focused light beam is frequency-doubled by the frequency doubling crystal, and the frequency doubling light generates parallel light after being expanded by the fourth convex lens.
2. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signal according to claim 1 or 2, wherein: the third convex lens is arranged at a position which is one focal length away from the output end of the doped optical fiber.
3. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signals, as claimed in claim 2, wherein: and the frequency doubling crystal is positioned at the focus of the third convex lens.
4. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signals, according to claim 3, wherein: and the fourth convex lens is positioned at a position which is one focal length away from the frequency doubling crystal.
5. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signals, as claimed in claim 1, wherein: the doped fiber is Yb-doped fiber or Nd-doped fiber.
6. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signals, as claimed in claim 1, wherein: the pump laser is any one of a 976nm pump source laser, a 915nm pump source laser, a 808nm pump source laser and a 880nm pump source laser.
7. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signals, as claimed in claim 1, wherein: the frequency doubling crystal is any one of KTP crystal, KDP crystal, LBO crystal and BBO crystal.
8. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signals, according to claim 7, wherein: and both ends of the frequency doubling crystal are respectively plated with a 532nm high-transmittance film and a 1064nm high-transmittance film.
9. The MOPA underwater wireless optical communication transmitting device based on the Manchester coded signal according to claim 1 or 2, wherein: the signal processor generates a Manchester coded signal by converting a '0' code in the information into a transition from low to high in level and converting a '1' code in the information into a transition from high to low in level.
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| CN201910956799.4A CN110556700A (en) | 2019-10-10 | 2019-10-10 | MOPA underwater wireless optical communication transmitting device based on Manchester coding signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300777A (en) * | 2021-05-11 | 2021-08-24 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Signal processing method and system for underwater communication and electronic equipment |
| CN113938205A (en) * | 2021-10-08 | 2022-01-14 | 浙江大学 | Direct modulation MOPA pulse fiber laser applied to underwater wireless optical communication transmitting end |
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| CN101083381A (en) * | 2006-05-30 | 2007-12-05 | 中国科学院西安光学精密机械研究所 | Semiconductor laser seed pulse principal oscillation magnifying full-fiber laser |
| CN102510001A (en) * | 2011-11-08 | 2012-06-20 | 陈抗抗 | Frequency-doubling green light laser |
| CN107302401A (en) * | 2017-06-17 | 2017-10-27 | 浙江大学 | A kind of underwater wireless optical communication apparatus and method based on wavelength-division multiplex technique |
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2019
- 2019-10-10 CN CN201910956799.4A patent/CN110556700A/en active Pending
Patent Citations (3)
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| CN101083381A (en) * | 2006-05-30 | 2007-12-05 | 中国科学院西安光学精密机械研究所 | Semiconductor laser seed pulse principal oscillation magnifying full-fiber laser |
| CN102510001A (en) * | 2011-11-08 | 2012-06-20 | 陈抗抗 | Frequency-doubling green light laser |
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Non-Patent Citations (1)
| Title |
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| CHAO ZHANG等: "Characterization of a MOPA system used for underwater optical communication", 《IEEE 2019 18TH INTERNATIONAL CONFERENCE ON OPTICAL COMMUNICATIONS AND NETWORKS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300777A (en) * | 2021-05-11 | 2021-08-24 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Signal processing method and system for underwater communication and electronic equipment |
| CN113300777B (en) * | 2021-05-11 | 2022-10-18 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Signal processing method and system for underwater communication and electronic equipment |
| CN113938205A (en) * | 2021-10-08 | 2022-01-14 | 浙江大学 | Direct modulation MOPA pulse fiber laser applied to underwater wireless optical communication transmitting end |
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Application publication date: 20191210 |