CN111371505B - Distributed optical frequency transmission device and transmission method based on multiple reflections - Google Patents
Distributed optical frequency transmission device and transmission method based on multiple reflections Download PDFInfo
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- CN111371505B CN111371505B CN202010111641.XA CN202010111641A CN111371505B CN 111371505 B CN111371505 B CN 111371505B CN 202010111641 A CN202010111641 A CN 202010111641A CN 111371505 B CN111371505 B CN 111371505B
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
- H04B10/802—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
Abstract
A distributed optical frequency transmission device based on multiple reflections and a transmission method thereof are disclosed, wherein the device comprises a local end, a transmission link, a user end and an access end, the invention adopts an optical coupler to extract forward and backward signals of multiple reflections in the transmission link, frequency division is carried out on the microwave signals filtered by a narrow-band microwave filter after beat frequency of a photoelectric conversion unit and then the signals are provided for an acousto-optic modulator, and phase noise of the access end is compensated in real time by the acousto-optic modulator. The invention can obtain optical frequency signals with stable phases at any position of a transmission link, does not need any other photoelectric conversion processing, and has the characteristics of low system noise, simple structure and high reliability.
Description
Technical Field
The invention relates to optical fiber time and frequency transmission, in particular to a distributed optical frequency transmission device and a transmission method based on multiple reflections.
Background
The high-precision time frequency signal plays a vital role in advanced scientific research such as deep space exploration, radio astronomy, basic physical research, geophysical survey, navigation positioning, precision metering, geodetic survey and observation and the like, and major basic engineering. With the rapid development of optical frequency standards including photonic crystal clocks and photonic crystal clocks, the optical frequency standard has become a strong competitor to the next generation of time frequency references. At present, the satellite-based space-based frequency transmission system can only realize 10 -15 Frequency transmission stability per day. Because the optical fiber has the advantages of low loss, high reliability, large bandwidth, no electromagnetic interference, small external disturbance and the like, the transmission technology based on the optical fiber optical frequency is proved to be an effective solution for breaking through the limitation of the prior art and realizing long-distance transmission for many times. Therefore, optical fiber-based optical frequency transmission has attracted high attention and interest internationally, and further, to realize space-to-ground integrationThe time frequency transmission is changed, and the optical frequency transmission based on the free space link draws high attention of researchers at home and abroad. The related research on optical fiber-based and space-only links has been carried out successively in countries such as the united states, the european union and japan. To meet the demand for point-to-multipoint distributed optical frequency delivery, germany g.grosche et al proposed multipoint-to-multipoint optical frequency delivery based on actively compensated links, but the distributed approach was implemented on the premise of implementing a stable main link [ see g.grosche, "Verfahren zum Bereitstellen einer refrenz-freqenz," German patent DE 200810062139 (June 24, 2010)]This adds significantly to the complexity and reliability of the system, especially when there is a problem with the main link phase locked loop, all access nodes are inoperable.
Disclosure of Invention
The invention aims to provide a distributed optical frequency transmission device and a transmission method based on multiple reflections, aiming at the defects of the prior art. The invention can obtain optical frequency signals with stable phases at any position of the transmission link without any other photoelectric conversion processing by coupling the optical signals transmitted by the main link back and forth for multiple times and then carrying out optical signal mixing, microwave filtering and frequency division processing and optical frequency shift, and has the characteristics of low system noise, simple structure and high reliability.
The technical solution of the invention is as follows:
a distributed optical frequency transmission device based on multiple reflection is characterized in that the device comprises a local end, a transmission link, a user end and an access end,
the local end consists of an optical isolator unit, a first optical coupler, a first Faraday rotator mirror, a first acousto-optic frequency shifter and a first microwave source, wherein the input end of the optical isolator unit is the input end of an optical frequency signal to be transmitted, the output end of the optical isolator unit is connected with the port 1 of the first optical coupler, the ports 2 and 3 of the first optical coupler are respectively connected with the port 1 of the first acousto-optic frequency shifter and the first Faraday rotator mirror, the port 3 of the first acousto-optic frequency shifter is connected with one end of the transmission link, and the output end of the first microwave source is connected with the port end 2 of the first acousto-optic frequency shifter;
the user side consists of a second acoustic optical frequency shifter, a second microwave source and a second Faraday rotator mirror, wherein a port 1 of the second acoustic optical frequency shifter is connected with the other end of the transmission link, a port 3 of the second acoustic optical frequency shifter is connected with the second Faraday rotator mirror, and an output end of the second microwave source is connected with a port 2 of the second acoustic optical frequency shifter;
the access end is composed of a second optical coupler, a photoelectric conversion unit, a frequency divider unit, a third acousto-optic frequency shifter, a microwave filter, an optical filter, a third optical coupler and a fourth optical coupler, wherein the second optical coupler is positioned at any node of the transmission link, four ports of the second optical coupler are respectively connected with the transmission link, the input end of the third optical coupler and the input end of the fourth optical coupler, the output end of the third optical coupler is respectively connected with the port 1 of the third acousto-optic frequency shifter and the port 2 of the fourth optical coupler, the port 3 of the fourth optical coupler is connected with the input end of the photoelectric conversion unit, the output end of the photoelectric conversion unit is connected with the input end of the microwave filter, the port 3 of the third acousto-optic frequency shifter is connected with the input end of the optical filter, the output end of the microwave filter is connected with the input end of the frequency divider unit, and the output end of the frequency divider unit is connected with the port 2 of the third acousto-optic frequency shifter.
The transmission link is an optical fiber link or a free space link, and the free space link is composed of a free space light emitting module, a receiving module and a free space link.
The optical frequency transmission method using the optical frequency transmission device based on multiple reflections is characterized by comprising the following specific steps of:
1) Optical frequency signal E to be transmitted 0 The first acousto-optic frequency shift signal passes through the optical isolator, the 1 port and the 2 port of the first optical couplerAnd the microwave signal output by the first microwave source is loaded to the 2 port of the first acousto-optic frequency shifter, and the angular frequency of the microwave signal is omega l Optical frequency signal E received by said user terminal 0 The output of the second acousto-optic frequency shifter after frequency shift is E 1 ：
E 1 ∝cos[(v+ω l +ω r )t+φ p ]
In the formula, v, omega r And phi p Respectively an input optical frequency signal E 0 Said second acoustic-optical frequency shifter operating signal angular frequency and said transfer link induced phase noise, whereby the input optical frequency signal E is ignored 0 Initial phase and signal amplitude of output signals of the first microwave source and the second microwave source, and optical frequency signal E 1 The signal returned to the local end passes through the 3 port and the 1 port of the first acousto-optic frequency shifter, the 2 port and the 3 port of the first optical coupler, the second Faraday rotator mirror, then passes through the 3 port and the 2 port of the first optical coupler, the 1 port of the first acousto-optic frequency shifter and the 3 port of the first optical coupler again, enters the transmission link after passing through the 1 port and the 3 port of the first acousto-optic frequency shifter and is transmitted to the user end;
obtaining the forward optical signal E in the transfer link at the second optical coupler of any node of the transfer link 2 And backward optical signal E 3 ：
In the formula, phi a Phase noise, phi, introduced for the local-to-access transfer link b For transferring link guide between user terminal and access terminalThe phase noise of the incoming signal is related to phi p ＝φ a +φ b ；
By mixing E 2 And E 3 E is obtained after the beat frequency of the second photoelectric conversion unit is input after passing through the fourth optical coupler and then is output after passing through the microwave filter 4 ：
E 4 ∝cos[2ω l t+2φ a ]
Said E 4 After the frequency division by two of the frequency divider unit, E can be obtained 5 ：
E 5 ∝cos[ω l t+φ a ]
Will E 5 After being loaded to the 2 port of the third acousto-optic frequency shifter, the signal E is transferred 6 ：
Above formula E 6 Can be filtered out by the optical filter to obtain a phase-stable optical frequency signal E 7 ∝cos[vt]And (6) outputting.
The working principle of the invention is as follows: the optical frequency to be transmitted is reflected for many times between the local end and the user end. The method comprises the steps of obtaining forward and backward optical signals at any position of a transmission link through an optical coupler, mixing the forward and backward optical signals on a photoelectric conversion unit, taking out corresponding microwave signals by adopting a narrow-band filter, performing frequency division by two, loading the frequency-divided microwave signals to an acousto-optic modulator to adjust the frequency of the forward transmitted optical frequency signals, and obtaining phase-stable frequency signals at the output end of the acousto-optic modulator through the optical filter to realize distributed optical frequency transmission.
The invention has the following technical effects:
experiments show that forward and backward signals are extracted by the optical coupler in the multi-reflection transmission link, the signals are filtered out by the narrow-band microwave filter after the beat frequency of the photoelectric conversion unit, and the optical frequency signals with stable phases are obtained at any position of the transmission link by a method of real-time compensation of the acousto-optic modulator. The invention has the characteristics of simple structure, high reliability and low realization cost.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a distributed optical frequency transfer device based on multiple reflections according to the present invention.
Detailed Description
The present invention is further described with reference to the following embodiments and the accompanying drawings, wherein the embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific work flows are provided, but the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a schematic structural diagram of an embodiment of the multi-reflection-based optical frequency transmission apparatus of the present invention, and it can be seen from the diagram that the multi-reflection-based optical frequency transmission apparatus of the present invention includes a local end 1, a transmission link 2, a user end 3 and an access end 4,
the local end 1 comprises an optical isolator unit 10, a first optical coupler 11, a first faraday rotator mirror 12, a first acousto-optic frequency shifter 13 and a first microwave source 14, wherein the input end of the optical isolator unit 10 is the input end of an optical frequency signal to be transmitted, the output end of the optical isolator unit 10 is connected with the port 1 of the first optical coupler 11, the ports 2 and 3 of the first optical coupler 11 are respectively connected with the port 1 of the first acousto-optic frequency shifter 13 and the first faraday rotator mirror 12, the port 3 of the first acousto-optic frequency shifter 13 is connected with one end of the transmission link, and the output end of the first microwave source 14 is connected with the port 2 of the first acousto-optic frequency shifter;
the user end 3 is composed of a second acoustic optical frequency shifter 15, a second microwave source 17 and a second faraday rotator mirror 16, a port 1 of the second acoustic optical frequency shifter 15 is connected with the other end of the transmission link 2, a port 3 of the second acoustic optical frequency shifter 12 is connected with the second faraday rotator mirror 16, and an output end of the second microwave source 17 is connected with a port 2 of the second acoustic optical frequency shifter 15;
the access terminal 4 is composed of a second optical coupler 18, a photoelectric conversion unit 21, a frequency divider unit 23, a third acousto-optic frequency shifter 24, a microwave filter 22, an optical filter 25, a third optical coupler 19 and a fourth optical coupler 20, the second optical coupler 18 is located at any node of the transmission link, four ports of the second optical coupler 18 are respectively connected with the transmission link 2, an input end of the third optical coupler 19 and an input end of the fourth optical coupler 20, an output end of the third optical coupler 19 is respectively connected with a port 1 of the third acousto-optic frequency shifter 24 and a port 2 of the fourth optical coupler 20, a port 3 of the fourth optical coupler 20 is connected with an input end of the photoelectric conversion unit 21, the photoelectric conversion unit 21 is connected with an input end of the microwave filter 22, a port 3 of the third acousto-optic frequency shifter 24 is connected with an input end of the optical frequency divider 25, an output end of the microwave filter 22 is connected with an input end of the frequency divider unit 23, and an output end of the frequency divider unit 23 is connected with an acousto-optic frequency shifter port 2 of the frequency shifter 24.
The transmission link 2 is composed of an optical fiber link or a free space link, and the free space link is composed of a free space light emitting module, a receiving module and a free space link.
The optical frequency transmission method using the optical frequency transmission device based on the passive phase compensation is characterized by comprising the following specific steps of:
1) Optical frequency signal E to be transmitted 0 The microwave signal which passes through the optical isolator 10, the port 1 and the port 2 of the first optical coupler 11 and the first acousto-optic frequency shifter 13 enters the transmission link 2, and the angular frequency of the microwave signal which is loaded to the port 2 of the first acousto-optic frequency shifter 13 by the microwave signal output by the first microwave source 14 is omega l Said user terminal 3 receives optical frequency signal E 0 The output of the second acousto-optic frequency shifter 15 after frequency shift is E 1 ：
E 1 ∝cos[(v+ω l +ω r )t+φ p ]
In the formula, v, omega r And phi p Are respectively an inputOptical frequency signal E 0 The angular frequency of said second acoustic-optical frequency shifter 15, the angular frequency of said operating signal and the phase noise introduced by said transfer link 2, neglecting here the input optical frequency signal E 0 The initial phase and the signal amplitude of the output signals of the first microwave source 14 and the second microwave source 17. Optical frequency signal E 1 The signal reflected by the second faraday rotator 16 sequentially passes through the 3 port, the 1 port and the transmission link 2 of the second acousto-optic frequency shifter 15 and returns to the local 1, and the signal returning to the local 1 passes through the 3 port, the 1 port of the first acousto-optic frequency shifter 13, the 2 port and the 3 port of the first optical coupler 11, and the second faraday rotator 12 and then passes through the 1 port, the 2 port of the first optical coupler 11, the 1 port and the 3 port of the first acousto-optic frequency shifter 13 again and then enters the transmission link 2 and is transmitted to the user end 3.
The second optical coupler 18 at any node of the transfer link acquires the forward optical signal E in the transfer link 2 2 And backward optical signal E 3 Comprises the following steps:
in the formula, phi a Transferring link-induced phase noise, phi, from local 1 to access 4 b Phase noise introduced for the transmission link between the user terminal 3 and the access terminal 4. The phase relation is phi p ＝φ a +φ b 。
By mixing E 2 And E 3 After being input to the second photoelectric conversion unit 21 through the fourth optical coupler 20, beat-frequency is passed through the microwave band-pass filter 22:
E 4 ∝cos[2ω l t+2φ a ]
E 4 passing through the second frequency dividerAfter a frequency division of two of the elements 23, E is obtained 5 ：
E 5 ∝cos[ω l t+φ a ]
Will E 5 After loading the third acousto-optic frequency shifter 24, the signal E is transmitted 6 ：
Above formula E 6 The first term can be filtered out by said optical filter 25 to obtain a phase-stable optical frequency signal E 7 ∝cos[vt]And (6) outputting.
Optical frequency signals to be transmitted are reflected on the main link for multiple times, and optical frequency signals with stable phases can be obtained at any access node of the link through optical mixing, microwave frequency division and optical frequency shift.
Experiments show that the forward signal and the backward signal are extracted by the optical coupler in the multi-reflection transmission link, the signals are filtered out by the narrow-band microwave filter after the beat frequency of the photoelectric conversion unit, and the optical frequency signals are compensated in real time by the acousto-optic modulator, so that the optical frequency signals with stable phases are obtained at any position of the transmission link. The invention has the characteristics of simple structure, high reliability and low realization cost.
Claims (3)
1. A distributed optical frequency transmission device based on multiple reflections is characterized by comprising a local end (1), a transmission link (2), a user end (3) and an access end (4),
the local end (1) is composed of an optical isolator unit (10), a first optical coupler (11), a first Faraday rotator mirror (12), a first acousto-optic frequency shifter (13) and a first microwave source (14), the input end of the optical isolator unit (10) is the input end of an optical frequency signal to be transmitted, the output end of the optical isolator unit (10) is connected with the port 1 of the first optical coupler (11), the ports 2 and 3 of the first optical coupler (11) are respectively connected with the port 1 of the first acousto-optic frequency shifter (13) and the first Faraday rotator mirror (12), the port 3 of the first acousto-optic frequency shifter (13) is connected with one end of the transmission link, and the output end of the first microwave source (14) is connected with the port 2 of the first acousto-optic frequency shifter (13);
the user end (3) is composed of a second acousto-optic frequency shifter (15), a second microwave source (17) and a second Faraday rotator mirror (16), a port 1 of the second acousto-optic frequency shifter (15) is connected with the other end of the transmission link (2), a port 3 of the second acousto-optic frequency shifter (15) is connected with the second Faraday rotator mirror (16), and an output end of the second microwave source (17) is connected with a port 2 of the second acousto-optic frequency shifter (15);
the access end (4) consists of a second optical coupler (18), a photoelectric conversion unit (21), a frequency divider unit (23), a third acousto-optic frequency shifter (24), a microwave filter (22), an optical filter (25), a third optical coupler (19) and a fourth optical coupler (20), said second optical coupler (18) being located at any node of said transfer link (2), four ports of the second optical coupler (18) are respectively connected with two ends of any node of the transfer link (2), the input end of the third optical coupler (19) and the port 1 of the fourth optical coupler (20), the output end of the third optical coupler (19) is respectively connected with the port 1 of the third acousto-optic frequency shifter (24) and the port 2 of the fourth optical coupler (20), the 3 port of the fourth optical coupler (20) is connected with the input end of the photoelectric conversion unit (21), the output end of the photoelectric conversion unit (21) is connected with the input end of the microwave filter (22), the 3 port of the third acousto-optic frequency shifter (24) is connected with the input end of the optical filter (25), the output end of the microwave filter (22) is connected with the input end of the frequency divider unit (23), the output end of the frequency divider unit (23) is connected with the 2 port of the third acousto-optic frequency shifter (24).
2. The multiple reflection based distributed optical frequency transfer device according to claim 1, wherein the transfer link (2) is a fiber link or a free space link, and the free space link is composed of a free space optical transmission module, a receiving module and a free space link.
3. The optical frequency transfer method using the multiple reflection based distributed optical frequency transfer device of claim 1, comprising the specific steps of:
1) Optical frequency signal E to be transmitted 0 The microwave signal passes through the optical isolator (10), the port 1 and the port 2 of the first optical coupler (11), the first acousto-optic frequency shifter (13) and then enters the transfer link (2), the microwave signal output by the first microwave source (14) is loaded to the port 2 of the first acousto-optic frequency shifter (13), and the angular frequency of the microwave signal is omega l Said user terminal (3) receiving optical frequency signal E 0 The output of the second acousto-optic frequency shifter (15) after frequency shift is E 1 ：
E 1 ∝cos[(v+ω l +ω r )t+φ p ]
In the formula, v, ω r And phi p Respectively an input optical frequency signal E 0 Said second acoustic-optical frequency shifter (15) operating signal angular frequency and said transfer link (2) introducing phase noise, ignoring the input optical frequency signal E 0 The initial phase and the signal amplitude of the output signals of the first microwave source (14) and the second microwave source (17), and an optical frequency signal E 1 The signal reflected by the second faraday rotator (16) sequentially passes through the 3 port and the 1 port of the second acousto-optic frequency shifter (15) and the transfer link (2) to return to the local end, and the signal returning to the local end (1) passes through the 3 port and the 1 port of the first acousto-optic frequency shifter (13), the 2 port and the 3 port of the first optical coupler (11), passes through the 3 port and the 2 port of the first optical coupler (11) again after passing through the first faraday rotator (12), enters the transfer link (2) after passing through the 1 port and the 3 port of the first acousto-optic frequency shifter (13) and is transferred to the user end (3);
a second optical coupler (18) at any node of said transfer link (2) for obtaining a forward optical signal E in the transfer link 2 And backward optical signal E 3 ：
In the formula, phi a Phase noise, phi, introduced for the local (1) to access (4) transfer link (2) b Phase noise introduced by the transmission link (2) between the user terminal (3) and the access terminal (4) with a phase relationship of phi p ＝φ a +φ b (ii) a By adding E 2 And E 3 E is input to the photoelectric conversion unit (21) after passing through the fourth optical coupler (20), beat-frequency is obtained after passing through the microwave filter (22) 4 ：
E 4 ∝cos[2ω l t+2φ a ]
Said E 4 After a frequency division by two of said frequency divider unit (23), E is obtained 5 ：
E 5 ∝cos[ω l t+φ a ]
Will E 5 After being loaded to the 2 ports of the third acousto-optic frequency shifter (24), the signal E is transferred 6 ：
Above formula E 6 Can be filtered out by means of said optical filter (25) to obtain a phase-stable optical frequency signal E 7 ∝cos[vt]And (6) outputting.
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| CN113259007B (en) * | 2021-06-24 | 2022-05-17 | 上海交通大学 | Cascaded optical frequency transfer device and method |
| CN114172584B (en) * | 2021-12-13 | 2023-04-21 | 上海交通大学 | High-precision optical millimeter wave/terahertz transmission system and transmission method |
| CN114142940B (en) * | 2021-12-13 | 2023-03-10 | 上海交通大学 | Distributed optical millimeter wave/terahertz transmission system and transmission method |
| CN114244448B (en) * | 2022-01-27 | 2023-03-14 | 上海交通大学 | Optical millimeter wave/terahertz transmission system and transmission method based on passive phase compensation |
| CN114915337B (en) * | 2022-04-08 | 2023-11-24 | 上海交通大学 | Optical time transfer system and method based on time interpolation |
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