CN115347954B - Regeneration and purification system for optical fiber frequency transmission signal - Google Patents
Regeneration and purification system for optical fiber frequency transmission signal Download PDFInfo
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- CN115347954B CN115347954B CN202210748013.1A CN202210748013A CN115347954B CN 115347954 B CN115347954 B CN 115347954B CN 202210748013 A CN202210748013 A CN 202210748013A CN 115347954 B CN115347954 B CN 115347954B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 238000000746 purification Methods 0.000 title claims abstract description 25
- 230000008929 regeneration Effects 0.000 title claims abstract description 20
- 238000011069 regeneration method Methods 0.000 title claims abstract description 20
- 239000013307 optical fiber Substances 0.000 title abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 59
- 238000012545 processing Methods 0.000 claims abstract description 25
- 230000003750 conditioning effect Effects 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 230000035559 beat frequency Effects 0.000 claims abstract description 9
- 230000001427 coherent effect Effects 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 230000001143 conditioned effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical group [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/64—Heterodyne, i.e. coherent receivers where, after the opto-electronic conversion, an electrical signal at an intermediate frequency [IF] is obtained
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a regeneration and purification system for optical fiber optical frequency transmission signals, which comprises: the device comprises an optical signal receiving module, a photoelectric detection module, a signal conditioning module, a mixing module, a signal processing module, an acousto-optic modulator and an optical signal output module. The optical fiber optical frequency transmission signal regeneration and purification system utilizes the heterodyne beat frequency device to detect and restrain the noise of the optical frequency signal to be purified and realize phase coherence, and realizes coherent amplification and purification of laser by locking the local ultra-stable light source phase to the upper-level transmission light phase.
Description
Technical Field
The invention belongs to the field of time frequency transmission, and particularly relates to a regeneration and purification system for an optical fiber optical frequency transmission signal.
Background
Along with the continuous and deep research of the precision optical frequency standard, the stability of the international strontium atom optical clock reaches 1E-19 level, and the optical fiber optical frequency transmission is used as a transmission mode with high precision, stability and reliability, so that the optical fiber optical frequency transmission can assist in realizing daily comparison between optical clocks and microwave clocks in different laboratories in different countries, and the application field of the optical frequency standard is expanded. In order to maintain the high stability characteristics of the frequency source after frequency transmission, the long-term relative stability of the frequency transmission should be better than 1E-19 orders of magnitude. When the optical frequency is transmitted for thousands of kilometers through the optical fiber, the noise of the optical fiber link is restrained by utilizing a cascading technology segment at present, the existing cascading technology comprises two types, namely an EDFA-based optical amplification relay and a regeneration-based optical relay, but the two relay schemes cannot avoid serious deterioration of the signal quality after the noise is accumulated step by step at a high frequency outside the noise restraining bandwidth, so that the transmission precision of the optical frequency transmission signal is influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a regeneration and purification system for an optical fiber optical frequency transmission signal. The technical problems to be solved by the invention are realized by the following technical scheme:
a fiber optic frequency transfer signal regeneration purification system comprising:
the optical signal receiving module is used for coupling the first frequency signal to be purified and the second frequency signal output by the signal output module to obtain a coupling signal;
the photoelectric detection module is connected with the optical signal receiving module and is used for detecting the frequency difference between the first frequency signal to be purified and the second frequency signal output by the signal output module to form a beat frequency signal;
the signal conditioning module is connected with the photoelectric detection module and is used for processing the beat frequency signals to obtain conditioning signals;
the frequency mixing module is connected with the signal conditioning module and the signal generator and is used for carrying out frequency mixing processing on the conditioned signals and the signals output by the signal generator;
the signal processing module is connected with the frequency mixing module and is used for conditioning and denoising the mixed signals to obtain purified feedback signals;
the acousto-optic modulator is connected with the signal processing module and the ultra-stable laser and is used for carrying out phase coherence on the purifying feedback signal and the output signal of the ultra-stable laser to obtain a purifying coherent signal, and the purifying coherent signal is obtained;
and the input end of the optical signal output module is connected with the acousto-optic modulator, the output end of the optical signal output module is connected with the optical signal receiving module, and the optical signal output module is used for outputting a first path of output signal to the optical signal receiving module as a first frequency signal to be purified after the purified coherent signal is split, and outputting a second path of output signal as a purified optical signal.
In a specific embodiment, the signal processing module comprises a phase discrimination unit, an averaging unit, a downsampling unit, a low-pass filtering unit, a phase accumulating unit, a digital PID unit and a direct digital frequency synthesizing unit which are connected in sequence.
In a specific embodiment, the optical signal receiving module and the optical signal outputting module are both Y-type couplers, and the Y-type couplers are 90:10 beam splitters.
In one embodiment, the driving frequency of the acousto-optic modulator is 10MHz-500MHz.
In a specific embodiment, the output frequency of the mixer is determined by the dominant frequency of the signal generator, wherein the dominant frequency of the signal generator is at least four times the output frequency of the mixer.
In one embodiment, the output frequency of the signal generator is in the range of 1MHz to 1.5GHz.
In a specific embodiment, the signal processing module is an FPGA processing chip.
The invention has the beneficial effects that:
1. the optical fiber optical frequency transmission signal regeneration and purification system utilizes the heterodyne beat frequency device to detect and inhibit the noise of the optical frequency signal to be purified and realize phase coherence, and realizes coherent amplification and purification of laser by locking the local ultra-stable light source phase to the upper-level transmission light phase, so that the complexity of system design is reduced, in addition, the problem of gradual accumulation of noise can be avoided by a feedback loop mode, thereby improving the signal transmission quality and further improving the transmission precision of the optical frequency.
2. The data signal processing module of the optical fiber optical frequency transmission signal regeneration and purification system builds a platform based on the FPGA chip and has the advantages of high integration level, strong flexibility and low cost.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a block diagram of a regeneration and purification system for an optical fiber frequency transmission signal according to an embodiment of the present invention;
fig. 2 is a block diagram of a signal processing module according to an embodiment of the present invention.
Description of the embodiments
The present invention will be described in further detail with reference to specific examples, but embodiments of the present invention are not limited thereto.
Examples
Referring to fig. 1, fig. 1 is a block diagram of a regeneration and purification system for an optical fiber frequency transmission signal according to an embodiment of the present invention, including:
the optical signal receiving module 10 is configured to couple the first frequency signal to be purified and the second frequency signal output by the signal output module 90 to obtain a coupled signal;
it should be noted that, the optical signal receiving module is a 2-input 1-output optical fiber coupler, the first frequency signal to be purified is a transmission signal received through one input end of the optical signal receiving module, the transmission signal needs to be regenerated and purified due to loss and noise in the transmission process, the second frequency signal output by the signal output module is a signal after the previous purification, and the signal after the previous purification is input into the optical signal receiving module through the other input end of the optical signal receiving module, so that two paths of signals are coupled to obtain a coupling signal.
The photoelectric detection module 20 is connected with the optical signal receiving module 10 and is used for detecting the frequency difference between the first frequency signal to be purified and the second frequency signal output by the signal output module 90 to form a beat frequency signal;
in general, the frequency difference between the two can be expressed as f 1 + f t Wherein f 1 Is the natural frequency of the ultra-stable laser, f t Is the actual frequency difference of the two signals.
The signal conditioning module 30 is connected with the photoelectric detection module 20 and is used for processing the beat frequency signal to obtain a conditioning signal;
the signal conditioning module includes a band pass filter 31, a low noise figure amplifier 32 and a tracking filter 33 to amplify and filter the beat signal to meet the index requirements of the mixer.
The mixing module 40 is connected with the signal conditioning module 30 and the signal generator 60, and is used for processing the conditioned signal and the signal output by the signal generator 60;
in the mixing process, the signal output by the signal conditioning module 30 is mixed with the signal output by the signal generator 60 through the mixer to obtain a signal with a smaller frequency.
The preferred frequency range of the signal generator in this embodiment is 1MHz-1.5GHz, and the output frequency of the mixer is 2MHz.
The signal processing module 50 is connected with the mixing module 40 and is used for conditioning and denoising the mixed signals to obtain feedback signals; specifically, referring to fig. 2, the signal processing module 50 includes a phase discrimination unit, an averaging unit, a downsampling unit, a low-pass filtering unit, a phase accumulating unit, a digital PID unit and a direct digital frequency synthesizing unit, which are sequentially connected. The method comprises the steps of firstly demodulating by a phase discrimination unit to obtain an original signal phase error, carrying out average downsampling on an error signal by an average unit and a downsampling unit, filtering jump points caused by environmental factors by a low-pass FIR filter, then realizing phase extension by a phase accumulation unit accumulation algorithm to eliminate frequency drift between lasers, and finally adjusting and transmitting the signal to a direct digital frequency synthesis unit by a digital PID unit. The data signal processing module of the optical fiber optical frequency transmission signal regeneration and purification system builds a platform based on the FPGA chip and has the advantages of high integration level, strong flexibility and low cost.
An acousto-optic modulator 70, connected to the signal processing module 50 and the ultra-stable laser 80, for performing phase coherence on the purified feedback signal and the output signal of the ultra-stable laser 80 to obtain a purified coherent signal;
and an input end of the optical signal output module 90 is connected with the acousto-optic modulator 70, an output end of the optical signal output module is connected with the optical signal receiving module 10, and the optical signal output module is used for outputting a first path of output signal to the optical signal receiving module as a first frequency signal to be purified after the purified coherent signal is split, and outputting a second path of output signal as a purified optical signal.
The optical fiber optical frequency transmission signal regeneration and purification system provided by the invention utilizes the heterodyne beat frequency device to detect and inhibit the noise of the optical frequency signal to be purified and realize phase coherence, so that the complexity of system design is reduced, in addition, the problem of gradual accumulation of noise can be avoided in a feedback loop mode, thereby improving the signal transmission quality and further improving the transmission precision of the optical frequency.
In one embodiment, the optical signal receiving module 10 and the optical signal outputting module 90 are both Y-type couplers, and it should be noted that, when coupling, the transmitted light and the purified light need to maintain proper intensities, and preferably, the Y-type couplers are 90:10 beam splitters.
In one embodiment, the driving frequency of the acousto-optic modulator 70 is 10MHz-500MHz.
In one embodiment, the signal processing module 50 is an FPGA processing chip.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
Although the present application has been described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (6)
1. A fiber optic frequency transfer signal regeneration purification system, comprising:
the optical signal receiving module is used for coupling the first frequency signal to be purified and the second frequency signal output by the signal output module to obtain a coupling signal;
the photoelectric detection module is connected with the optical signal receiving module and is used for detecting the frequency difference between the first frequency signal to be purified and the second frequency signal output by the signal output module to form a beat frequency signal;
the signal conditioning module is connected with the photoelectric detection module and is used for processing the beat frequency signals to obtain conditioning signals;
the frequency mixing module is connected with the signal conditioning module and the signal generator and is used for carrying out frequency mixing processing on the conditioned signals and the signals output by the signal generator;
the signal processing module is connected with the frequency mixing module and is used for conditioning and denoising the mixed signals to obtain purified feedback signals;
the acousto-optic modulator is connected with the signal processing module and the ultra-stable laser and is used for carrying out phase coherence on the purification feedback signal and the output signal of the ultra-stable laser to obtain a purification coherent signal;
the input end of the optical signal output module is connected with the acousto-optic modulator, the output end of the optical signal output module is connected with the optical signal receiving module, and the optical signal output module is used for outputting a first path of output signal to the optical signal receiving module as a first frequency signal to be purified after the purified coherent signal is split, and outputting a second path of output signal as a purified optical signal;
the signal processing module comprises a phase discrimination unit, an average unit, a downsampling unit, a low-pass filtering unit, a phase accumulation unit, a digital PID unit and a direct digital frequency synthesis unit which are connected in sequence.
2. The fiber optic frequency transfer signal regeneration and purification system of claim 1, wherein the optical signal receiving module and the optical signal output module are both Y-couplers, and the Y-couplers are 90:10 splitters.
3. The fiber optic frequency transmission signal regeneration and purification system according to claim 1, wherein the driving frequency of the acousto-optic modulator is 10MHz-500MHz.
4. The fiber optic frequency translating signal regeneration purification system of claim 1, wherein the output frequency of the mixer is determined by a primary frequency of a signal generator, wherein the primary frequency of the signal generator is at least four times the output frequency of the mixer.
5. The fiber optic frequency translating signal regeneration purification system of claim 1, wherein said signal generator output range is 1MHz-1.5GHz.
6. The fiber optic frequency transfer signal regeneration and purification system of claim 1, wherein the signal processing module is an FPGA processing chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210748013.1A CN115347954B (en) | 2022-06-29 | 2022-06-29 | Regeneration and purification system for optical fiber frequency transmission signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210748013.1A CN115347954B (en) | 2022-06-29 | 2022-06-29 | Regeneration and purification system for optical fiber frequency transmission signal |
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| CN115347954A CN115347954A (en) | 2022-11-15 |
| CN115347954B true CN115347954B (en) | 2023-07-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039469A (en) * | 2018-08-20 | 2018-12-18 | 中国科学院上海光学精密机械研究所 | Time-frequency standard signal merges Transmission system and transmission method |
| CN113242039A (en) * | 2021-05-06 | 2021-08-10 | 中国科学院国家授时中心 | Purification device for optical fiber optical frequency transmission signal |
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2022
- 2022-06-29 CN CN202210748013.1A patent/CN115347954B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039469A (en) * | 2018-08-20 | 2018-12-18 | 中国科学院上海光学精密机械研究所 | Time-frequency standard signal merges Transmission system and transmission method |
| CN113242039A (en) * | 2021-05-06 | 2021-08-10 | 中国科学院国家授时中心 | Purification device for optical fiber optical frequency transmission signal |
Non-Patent Citations (2)
| Title |
|---|
| "Coherent phase transfer via fiber using heterodyne optical phase locking as optical amplification";XUE DENG.et;《Optical Society of America》;全文 * |
| "Learning-based Co-Design of Distributed Edge Sensing and Transmission for Industrial Cyber-Physical Systems";Tiankai Jin;《2021 IEEE 19th International Conference on Industrial Informatics (INDIN)》;全文 * |
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