Time frequency transfer device

Abstract

The invention discloses time frequency transmission equipment. Comprising a frequency distribution amplifier, a first time interval counter, a second time interval counter, a first laser, a second laser, a first photoelectric modulator, a second photoelectric modulator, a first time delay controller, a second time delay controller, a wavelength division multiplexer, an isolator, a first optical detection shaping module and a second optical detection shaping module. The system comprises a first optical detection shaping module, a second optical detection shaping module, a third optical detection shaping module, a fourth optical detection shaping module, a first optical circulator, a second optical circulator, an optical coupler, a first wavelength division demultiplexer, a second wavelength division demultiplexer, an optical amplifier, a first time delay calculation control module, a second time delay calculation control module and an optical fiber. According to the equipment, large-range rough control is carried out by utilizing delay inequality generated by 1PPs, fine control is carried out by utilizing delay inequality generated by 10MHz signals, and simultaneous high-precision transmission of time signals and frequency signals is realized.

Description

Technical Field

[0001] The present application relates to the technical field of precision clock and time synchronization, and in particular to a time frequency transfer device. Background Art

[0002] Time frequency or microwave frequency is widely used in fields such as communication, radar, and aerospace, and the stability and security of its signal are very important. With the improvement of atomic clock indicators, there is an increasing demand for lossless transmission of clock group indicators to the required application occasions. At present, high-precision time and frequency signal transmission mainly adopts optical fiber transmission, in which the frequency signal and the time signal can be transmitted separately or simultaneously by multiplexing. Patent ZL201310461820 proposes a "compensator and method for transmission delay in optical fiber time and frequency transmission". The invention uses the central station to remotely inject and lock the photoelectric oscillator of the remote station, and the remote station then feeds the error back to the central station, and the central station then uses the phase delay and fluctuation control circuit to compensate. Patent ZL201510221740.2 proposes "a method for optical fiber optical frequency transmission based on remote end compensation". This method first makes the optical signal emitted from the local end, transmitted to the remote end and then transmitted back through another optical fiber. After the beat frequency is completed at the local end, the phase shift is controlled to achieve accurate measurement of optical fiber noise. Patent ZL201610035779.X proposed "a high-precision optical fiber time-frequency ring networking system and networking method", which established an optical fiber link network between a master clock and multiple slave clock stations through optical fiber. Patent ZL201310467522.8 proposed "a free space frequency signal transmission system based on phase compensation", Patent ZL201310683870.9 proposed "a microwave ranging and time synchronization system and method based on frequency synchronization", and Patent ZL201410141670.5 proposed "a frequency transmission system and method with a post-compensation system".

[0003] The above patent uses optical fiber transmission to transmit frequency signals to the user end with high accuracy. However, the transmission of time signals currently still uses the time difference compensation method. Since the time difference compensation mainly uses a second pulse or a series of slightly higher frequency square waves generated based on the second pulse, which are transmitted from the transmitter to the user end and then returned to the transmitter for delay detection, the transmission accuracy of this method is low. Summary of the invention

[0004] The main purpose of the present application is to provide a time and frequency transmission device to solve the technical problem of low transmission accuracy in the related art when transmitting time signals by means of time difference compensation.

[0005] According to one aspect of the present application, a time frequency transfer device is provided, comprising: a frequency distribution amplifier, a first time interval counter, a second time interval counter, a first laser, a second laser, a first photoelectric modulator, a second photoelectric modulator, a first delay controller, a second delay controller, a wavelength division multiplexer, an isolator, a first optical detection shaping module, a second optical detection shaping module, a third optical detection shaping module, a fourth optical detection shaping module, a first optical circulator, a second optical circulator, an optical coupler, a first de-wavelength division multiplexer, a second de-wavelength division multiplexer, an optical amplifier, a first delay calculation control module, a second delay calculation control module and an optical fiber, wherein:

[0006] The frequency distribution amplifier is respectively connected to the first time interval counter, the second time interval counter, the first photoelectric modulator and the second photoelectric modulator, and is configured to perform multi-channel isolation amplification and output of the 10 MHz signal and the 1PPs signal of the standard clock, wherein the first channel 1PPs signal is used as the external standard signal of the first time interval counter, the second channel 1PPs signal is input to the first photoelectric modulator, the first channel 10 MHz signal is used as the external standard signal of the second time interval counter, and the second channel 10 MHz signal is input to the second photoelectric modulator;

[0007] A first laser is connected to the first photoelectric modulator and is configured to input a first optical signal to the first photoelectric modulator;

[0008] a second laser connected to the second photoelectric modulator and configured to input a second optical signal to the second photoelectric modulator;

[0009] A first optoelectronic modulator is connected to the first delay controller and is configured to modulate the second 1PPs signal and the first optical signal, and input the obtained first modulated signal to the first delay controller;

[0010] A second optoelectronic modulator is connected to the second delay controller and is configured to modulate the second 10 MHz signal and the second optical signal, and input the obtained second modulated signal into the second delay controller;

[0011] The wavelength division multiplexer is connected to the first delay controller and the second delay controller, the isolator is connected to the wavelength division multiplexer, the first optical circulator is connected to the isolator, the second optical circulator is connected to the first optical circulator through an optical fiber, the optical coupler is connected to the second optical circulator, and the second demultiplexer is connected to the optical coupler, the third optical detection shaping module and the fourth optical detection shaping module respectively, wherein,

[0012] The first modulated signal and the second modulated signal enter the wavelength division multiplexer after passing through the first delay controller and the second delay controller respectively, and then enter the optical coupler after passing through the isolator, the first optical circulator, the optical fiber, and the second optical circulator. The optical coupler divides the first modulated signal and the second modulated signal into a first modulated signal and a second modulated signal, wherein the first modulated signal and the second modulated signal both include the first modulated signal and the second modulated signal;

[0013] The first modulated signal output by the optical coupler enters the second de-wavelength division multiplexer, and the second de-wavelength division multiplexer separates the first optical signal in the first modulated signal included in the first modulated signal, and inputs the separated signal into the fourth optical detection shaping module, and outputs the second 1PPs signal; the second de-wavelength division multiplexer separates the second optical signal in the second modulated signal included in the first modulated signal, and inputs the separated signal into the third optical detection shaping module, and outputs the second 10MHz signal;

[0014] The optical amplifier is connected between the optical coupler and the second optical circulator, and the first de-wavelength division multiplexer is connected to the first optical circulator, the first optical detection shaping module and the second optical detection shaping module respectively;

[0015] The second modulated signal output by the optical coupler enters the second optical circulator after being amplified by the optical amplifier, and then enters the first de-wavelength division multiplexer through the optical fiber and the first optical circulator. The first de-wavelength division multiplexer separates the first optical signal in the first modulated signal included in the second modulated signal, and inputs the separated signal into the first optical detection shaping module, and outputs the second 1PPs signal; the first de-wavelength division multiplexer separates the second optical signal in the second modulated signal included in the second modulated signal, and inputs the separated signal into the second optical detection shaping module, and outputs the second 10MHz signal;

[0016] The first optical detection shaping module is connected to the first time interval counter, and the first delay calculation control module is connected between the first time interval counter and the first delay controller, wherein the second 1PPs signal output by the first optical detection shaping module enters the first delay calculation control module through the first time interval counter, and the first delay calculation control module controls the first delay controller to compensate for the delay difference generated by the second 1PPs signal;

[0017] The second optical detection shaping module is connected to the second time interval counter, and the second delay calculation control module is connected between the second time interval counter and the second delay controller, wherein the second 10MHz signal output by the second optical detection shaping module enters the second delay calculation control module through the second time interval counter, and the second delay calculation control module controls the second delay controller to compensate for the delay difference generated by the second 10MHz signal.

[0018] Optionally, after the first delay calculation control module completes compensating for the delay difference generated by the second 1PPs signal, the second delay calculation control module is started to compensate for the delay difference generated by the second 10 MHz signal.

[0019] Optionally, when the length of the optical fiber link between the first delay calculation control module and the first delay controller is greater than a preset length, a plurality of first delay controllers are used in cascade.

[0020] Optionally, when the first 10 MHz signal loaded between the frequency distribution amplifier and the second time interval counter and the second 10 MHz signal loaded between the frequency distribution amplifier and the second optoelectronic modulator are multiplied to a preset frequency for transmission, the parameters of the second optical detection shaping module, the third optical detection shaping module and the second delay calculation control module are adapted to the preset frequency.

[0021] Optionally, the first laser and the second laser are distributed feedback DFB lasers.

[0022] Optionally, the first laser and the second laser have a wavelength of 1550 nm, a line width of less than 100 MHZ, and are connected by pigtails.

[0023] In this application, a new type of precision time and frequency transmission device is proposed. The device uses the delay difference generated by the 1PPs signal to perform large-range coarse control, and uses the delay difference generated by the 10MHz signal to perform fine control, achieving the technical effect of greatly improving the transmission accuracy of the time signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is a structural schematic diagram of a time-frequency transfer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] In order to better understand the embodiments of the present application, the technical terms involved in the embodiments of the present application are explained as follows:

[0030] 1PPs, the full name of which is 1 Pulse Per Second, means one pulse per second. It is a time synchronization signal that is usually used to provide an accurate time reference. This signal is very useful in many applications that require high-precision time synchronization, such as the Global Positioning System (GPS), telecommunication networks, power systems, scientific research, and financial transactions.

[0031] Time and frequency transfer device refers to a device used to accurately transmit time or frequency signals between different locations.

[0032] In the related art, the frequency signal can be transmitted to the user end with high precision by using optical fiber transmission. However, the transmission of time signals currently still adopts the time difference compensation method. Since the time difference compensation mainly adopts the second pulse or a series of slightly higher frequency square waves generated based on the second pulse, which are transmitted to the user end through the transmitting end and then returned to the transmitting end for delay detection, the transmission accuracy of this method is low. In order to solve this problem, the embodiments of the present application provide relevant solutions, which are described in detail below.

[0033] Figure 1is a structural diagram of a time frequency transfer device according to an embodiment of the present application, such as Figure 1 As shown, the device includes: a frequency distribution amplifier 1, a first time interval counter 2, a second time interval counter 10, a first laser 3, a second laser 6, a first photoelectric modulator 4, a second photoelectric modulator 7, a first delay controller 5, a second delay controller 8, a wavelength division multiplexer 11, an isolator 12, a first optical detection shaping module 9, a second optical detection shaping module 13, a third optical detection shaping module 19, a fourth optical detection shaping module 20, a first optical circulator 15, a second optical circulator 16, an optical coupler 17, a first de-wavelength division multiplexer 14, a second de-wavelength division multiplexer 18, an optical amplifier 21, a first delay calculation control module 22, a second delay calculation control module 23 and an optical fiber 24, wherein,

[0034] The frequency distribution amplifier 1 is respectively connected to the first time interval counter 2, the second time interval counter 10, the first photoelectric modulator 4 and the second photoelectric modulator 7, and is configured to perform multi-channel isolation amplification and output of the 10MHz signal and the 1PPs signal of the standard clock, wherein the first 1PPs signal is used as the external standard signal of the first time interval counter 2, the second 1PPs signal is input to the first photoelectric modulator 4, the first 10MHz signal is used as the external standard signal of the second time interval counter 10, and the second 10MHz signal is input to the second photoelectric modulator 7.

[0035] A frequency distribution amplifier is a device designed to receive one or more input signals and amplify and distribute these signals to multiple independent output ports.

[0036] Multi-channel isolated output means that the same signal can be provided to multiple loads at the same time, and each output is electrically isolated from each other to reduce interference.

[0037] like Figure 1 As shown, the frequency distribution amplifier 1 can perform multi-channel isolation amplification output of the 10MHz signal and the 1PPs signal of the standard clock, output two 1PPs signals and two 10MHz signals, one 1PPs and 10MHz signal (i.e. the first 1PPs signal and the first 10MHz signal) are respectively connected to the first time interval counter 2 and the second time interval counter 10 as their external standard signals. The other 1PPs and 10MHz signals (i.e. the second 1PPs signal and the second 10MHz signal) are loaded to the first photoelectric modulator 4 and the second photoelectric modulator 7.

[0038] A first laser 3 is connected to the first photoelectric modulator 4 and is configured to input a first optical signal to the first photoelectric modulator 4;

[0039] The second laser 6 is connected to the second photoelectric modulator 7 and is configured to input a second optical signal to the second photoelectric modulator 7 .

[0040] A laser is a device that can produce a highly concentrated, monochromatic, and coherent light beam. Figure 1 As shown, the first laser 3 is connected to the first photoelectric modulator 4 for inputting an optical signal to the first photoelectric modulator 4 , and the second laser 6 is connected to the second photoelectric modulator 7 for inputting an optical signal to the second photoelectric modulator 7 .

[0041] It should be noted that the first optical signal and the second optical signal are the same optical signal. They are distinguished by “first” and “second” only for the convenience of description.

[0042] According to an optional embodiment of the present application, the first laser 3 and the second laser 6 are distributed feedback DFB lasers.

[0043] Distributed Feedback (DFB) laser is a single-mode semiconductor laser that achieves wavelength selection and mode control by introducing a periodic grating structure in the active region inside the laser. This design enables DFB lasers to produce very narrow linewidth and highly stable laser output, which is suitable for application scenarios that require precise wavelength control, such as optical fiber communications, precision measurement, and scientific research.

[0044] According to another optional embodiment of the present application, the first laser 3 and the second laser 6 have a wavelength of 1550 nm, a line width of less than 100 MHZ, and are connected by pigtails.

[0045] In the embodiment of the present application, the first laser 3 and the second laser 6 are preferably lasers in the 1550 nm band, with a line width not exceeding 100 MHz, and have pigtail connections.

[0046] The first laser 3 and the second laser 6 are preferably lasers in the 1550nm band, because 1550nm is one of the commonly used wavelengths in the field of communications, and is particularly suitable for long-distance optical fiber transmission because it is located in the window with the smallest optical fiber loss. In a high-precision time and frequency transmission system, the use of a DFB laser in the 1550nm band can achieve time synchronization signal transmission over a longer distance while maintaining low phase noise.

[0047] A line width of no more than 100 MHz means that the laser output spectrum is very narrow, which helps to reduce dispersion effects and improve signal quality and transmission distance.

[0048] A laser with a pigtail connection means that a section of optical fiber is directly connected to the output end of the laser. This section of optical fiber is called a "pigtail". The pigtail connection allows the laser to be directly connected to a fiber optic network or other optical components, simplifying the system assembly and maintenance process.

[0049] It should be noted that when selecting the first laser 3 and the second laser 6 , the requirements of the wavelength division multiplexer 11 should be met, that is, the wavelength of the optical signal generated by the first laser 3 and the second laser 6 should meet the parameter requirements of the wavelength division multiplexer 11 .

[0050] The first electro-optical modulator 4 is connected to the first delay controller 5 and is configured to modulate the second 1PPs signal and the first optical signal, and input the obtained first modulated signal to the first delay controller 5;

[0051] The second optoelectronic modulator 7 is connected to the second delay controller 8 , and is configured to modulate the second 10 MHz signal and the second optical signal, and input the obtained second modulated signal to the second delay controller 8 .

[0052] like Figure 1 As shown, the first optoelectronic modulator 4 modulates the second 1PPs signal and the first optical signal, and inputs the obtained first modulated signal to the first delay controller 5, and the second optoelectronic modulator 7 modulates the second 10MHz signal and the second optical signal, and inputs the obtained second modulated signal to the second delay controller 8.

[0053] like Figure 1 As shown, the wavelength division multiplexer 11 is connected to the first delay controller 5 and the second delay controller 8, the isolator 12 is connected to the wavelength division multiplexer 11, the first optical circulator 15 is connected to the isolator 12, the second optical circulator 16 is connected to the first optical circulator 15 through the optical fiber 24, the optical coupler 17 is connected to the second optical circulator 16, and the second demultiplexer 18 is respectively connected to the optical coupler 17, the third optical detection shaping module 19 and the fourth optical detection shaping module 20, wherein,

[0054] The first modulated signal and the second modulated signal enter the wavelength division multiplexer 11 after passing through the first delay controller 5 and the second delay controller 8 respectively, and then enter the optical coupler 17 after passing through the isolator 12, the first optical circulator 15, the optical fiber 24, and the second optical circulator 16. The optical coupler 17 divides the first modulated signal and the second modulated signal into a first modulated signal and a second modulated signal, wherein the first modulated signal and the second modulated signal both include the first modulated signal and the second modulated signal.

[0055] The first modulated signal output by the optical coupler 17 enters the second de-wavelength division multiplexer 18, and the second de-wavelength division multiplexer 18 separates the first optical signal in the first modulated signal included in the first modulated signal, and inputs the separated signal to the fourth optical detection shaping module 20, and outputs a second 1PPs signal; the second de-wavelength division multiplexer 18 separates the second optical signal in the second modulated signal included in the first modulated signal, and inputs the separated signal to the third optical detection shaping module 19, and outputs a second 10MHz signal.

[0056] The second 1PPs signal output by the fourth optical detection shaping module 20 and the second 10 MHz signal output by the third optical detection shaping module 19 are transmitted to the user end as standard clock signals.

[0057] like Figure 1 As shown, the optical amplifier 21 is connected between the optical coupler 17 and the second optical circulator 16, and the first de-WDM 14 is connected to the first optical circulator 15, the first optical detection shaping module 9 and the second optical detection shaping module 13 respectively;

[0058] The second modulated signal output by the optical coupler 17 is amplified by the optical amplifier 21 and then enters the second optical circulator 16, and then enters the first de-wavelength division multiplexer 14 through the optical fiber 24 and the first optical circulator 15. The first de-wavelength division multiplexer 14 separates the first optical signal in the first modulated signal included in the second modulated signal, and inputs the separated signal to the first optical detection shaping module 9, and outputs a second 1PPs signal; the first de-wavelength division multiplexer 14 separates the second optical signal in the second modulated signal included in the second modulated signal, and inputs the separated signal to the second optical detection shaping module 13, and outputs a second 10MHz signal.

[0059] As mentioned above, the optical coupler 17 divides the modulated signal into a first modulated signal and a second modulated signal, wherein the first modulated signal is output by the second de-wavelength division multiplexer 18, the third optical detection shaping module 19, and the fourth optical detection shaping module 20 to output a 1PPs signal and a 10MHz signal as a standard clock signal transmitted to the user end.

[0060] After being amplified by the optical amplifier 21, the second modulated signal enters the second optical circulator 16, the optical fiber 24 and the first optical circulator 15 and returns to the transmitting end, and then passes through the first wavelength division multiplexer 14 to separate the first optical signal and the second optical signal. The separated signals enter the first optical detection shaping module 9 and the second optical detection shaping module 13 respectively, and output 1PPs signal and 10MHz signal respectively.

[0061] like Figure 1As shown, the first optical detection shaping module 9 is connected to the first time interval counter 2, and the first delay calculation control module 22 is connected between the first time interval counter 2 and the first delay controller 5, wherein the second 1PPs signal output by the first optical detection shaping module 9 enters the first delay calculation control module 22 through the first time interval counter 2, and the first delay calculation control module 22 controls the first delay controller 5 to compensate for the delay difference generated by the second 1PPs signal.

[0062] The second optical detection shaping module 13 is connected to the second time interval counter 10, and the second delay calculation control module 23 is connected between the second time interval counter 10 and the second delay controller 8, wherein the second 10MHz signal output by the second optical detection shaping module 13 enters the second delay calculation control module 23 through the second time interval counter 10, and the second delay calculation control module 23 controls the second delay controller 8 to compensate for the delay difference generated by the second 10MHz signal.

[0063] The 1PPs signal output by the first optical detection shaping module 9 and the 10MHz signal output by the second optical detection shaping module 13 enter the first time interval counter 2 and the second time interval counter 10 respectively, and after being calculated by the first time interval counter 2 and the second time interval counter 10, enter the first delay calculation control module 22 and the second delay calculation control module 23 respectively. The first delay calculation control module 22 and the second delay calculation control module 23 have corresponding calculation programs that can control the first delay controller 5 and the second delay controller 8 respectively to compensate for the delay difference generated by the 1PPs signal and the 10MHz signal.

[0064] In some optional embodiments of the present application, after the first delay calculation control module 22 completes compensating the delay difference generated by the second 1PPs signal, the second delay calculation control module 23 is started to compensate for the delay difference generated by the second 10 MHz signal.

[0065] In an embodiment of the present application, the first delay calculation control module 22 is started first, and the large-scale delay difference (the delay difference caused by the 1PPs signal) is compensated through the first delay controller 5; when the first delay calculation control module 22 is locked, the second delay calculation control module 23 calculates and compensates the fine delay difference (the delay difference caused by the 10MHz signal) through the second delay controller 8.

[0066] As an optional embodiment of the present application, when the length of the optical fiber link between the first delay calculation control module 22 and the first delay controller 5 is greater than a preset length, multiple first delay controllers 5 are used in cascade.

[0067] If the optical fiber link between the first delay calculation control module 22 and the first delay controller 5 is long, multiple first delay controllers 5 may be used in cascade.

[0068] As the length of the optical fiber link increases, the time delay of signal propagation will also increase accordingly. By setting up multiple delay controllers on the link, local delay compensation can be performed at each key node. Long-distance transmission may lead to an increase in the accumulated delay error. Through segmented compensation, the delay error of each link can be reduced, thereby improving the synchronization accuracy of the entire system.

[0069] In some other optional embodiments of the present application, when the first 10 MHz signal loaded between the frequency distribution amplifier 1 and the second time interval counter 10 and the second 10 MHz signal loaded between the frequency distribution amplifier 1 and the second optoelectronic modulator 7 are multiplied to a preset frequency for transmission, the parameters of the second optical detection shaping module 13, the third optical detection shaping module 19 and the second delay calculation control module 23 are adapted to the preset frequency.

[0070] In an optional embodiment of the present application, the 10MHz signal loaded between the frequency distribution amplifier 1 and the second optoelectronic modulator 7 and the frequency distribution amplifier 1 and the second time interval counter 10 can also be multiplied to a certain high frequency for transmission, but the corresponding back-end second optical detection shaping module 13, the third optical detection shaping module 19 and the second delay calculation control module 23 and other devices should select devices corresponding to the frequency after the multiplication process. High-frequency transmission can keep the modulation sideband of the time-frequency signal away from the optical carrier and obtain a higher signal-to-noise ratio, but the corresponding equipment cost will be greatly increased.

[0071] The above-mentioned time and frequency transmission device proposed in this application uses the delay difference generated by 1PPs to perform large-scale rough control, and uses the delay difference generated by 10MHz signal to perform fine control, thereby realizing high-precision transmission of time signal and frequency signal at the same time. Due to the use of two-stage control, the transmission accuracy is improved, especially the transmission accuracy of second pulse is greatly improved.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0074] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A time frequency transfer device, characterized in that: include: A frequency distribution amplifier (1), a first time interval counter (2), a second time interval counter (10), a first laser (3), a second laser (6), a first photoelectric modulator (4), a second photoelectric modulator (7), a first delay controller (5), a second delay controller (8), a wavelength division multiplexer (11), an isolator (12), a first optical detection shaping module (9), a second optical detection shaping module (13), a third optical detection shaping module (19), a fourth optical detection shaping module (20), a first optical circulator (15), a second optical circulator (16), an optical coupler (17), a first de-wavelength division multiplexer (14), a second de-wavelength division multiplexer (18), an optical amplifier (21), a first delay calculation control module (22), a second delay calculation control module (23) and an optical fiber (24), wherein: The frequency distribution amplifier (1) is respectively connected to the first time interval counter (2), the second time interval counter (10), the first photoelectric modulator (4) and the second photoelectric modulator (7), and is configured to perform multi-channel isolation amplification and output of a 10 MHz signal and a 1PPs signal of a standard clock, wherein the first 1PPs signal is used as an external standard signal of the first time interval counter (2), the second 1PPs signal is input to the first photoelectric modulator (4), the first 10 MHz signal is used as an external standard signal of the second time interval counter (10), and the second 10 MHz signal is input to the second photoelectric modulator (7); The first laser (3) is connected to the first photoelectric modulator (4) and is configured to input a first optical signal to the first photoelectric modulator (4); The second laser (6) is connected to the second photoelectric modulator (7) and is configured to input a second optical signal to the second photoelectric modulator (7); The first electro-optical modulator (4) is connected to the first delay controller (5), and is configured to modulate the second 1PPs signal and the first optical signal, and input the obtained first modulated signal into the first delay controller (5); The second optoelectronic modulator (7) is connected to the second delay controller (8), and is configured to modulate the second 10 MHz signal and the second optical signal, and input the obtained second modulated signal into the second delay controller (8); The wavelength division multiplexer (11) is connected to the first delay controller (5) and the second delay controller (8), the isolator (12) is connected to the wavelength division multiplexer (11), the first optical circulator (15) is connected to the isolator (12), the second optical circulator (16) is connected to the first optical circulator (15) through the optical fiber (24), the optical coupler (17) is connected to the second optical circulator (16), and the second de-wavelength division multiplexer (18) is respectively connected to the optical coupler (17), the third optical detection shaping module (19) and the fourth optical detection shaping module (20), wherein: The first modulated signal and the second modulated signal respectively pass through the first delay controller (5) and the second delay controller (8) and enter the wavelength division multiplexer (11), and then pass through the isolator (12), the first optical circulator (15), the optical fiber (24), and the second optical circulator (16) and enter the optical coupler (17). The optical coupler (17) divides the first modulated signal and the second modulated signal into a first modulated signal and a second modulated signal, wherein the first modulated signal and the second modulated signal both include the first modulated signal and the second modulated signal; The first modulated signal output by the optical coupler (17) enters the second de-wavelength division multiplexer (18), the second de-wavelength division multiplexer (18) separates the first optical signal from the first modulated signal included in the first modulated signal, and inputs the separated signal into the fourth optical detection shaping module (20), and outputs the second 1PPs signal; the second de-wavelength division multiplexer (18) separates the second optical signal from the second modulated signal included in the first modulated signal, and inputs the separated signal into the third optical detection shaping module (19), and outputs the second 10MHz signal; The optical amplifier (21) is connected between the optical coupler (17) and the second optical circulator (16), and the first de-wavelength division multiplexer (14) is respectively connected to the first optical circulator (15), the first optical detection shaping module (9) and the second optical detection shaping module (13); The second modulated signal output by the optical coupler (17) is amplified by the optical amplifier (21) and then enters the second optical circulator (16), and then enters the first de-wavelength division multiplexer (14) through the optical fiber (24) and the first optical circulator (15). The first de-wavelength division multiplexer (14) separates the first optical signal from the first modulated signal included in the second modulated signal, and inputs the separated signal into the first optical detection shaping module (9), and outputs the second 1PPs signal; the first de-wavelength division multiplexer (14) separates the second optical signal from the second modulated signal included in the second modulated signal, and inputs the separated signal into the second optical detection shaping module (13), and outputs the second 10MHz signal; The first optical detection shaping module (9) is connected to the first time interval counter (2), and the first delay calculation control module (22) is connected between the first time interval counter (2) and the first delay controller (5), wherein the second 1PPs signal output by the first optical detection shaping module (9) enters the first delay calculation control module (22) through the first time interval counter (2), and the first delay calculation control module (22) controls the first delay controller (5) to compensate for the delay difference generated by the second 1PPs signal; The second optical detection shaping module (13) is connected to the second time interval counter (10), and the second delay calculation control module (23) is connected between the second time interval counter (10) and the second delay controller (8), wherein the second 10 MHz signal output by the second optical detection shaping module (13) enters the second delay calculation control module (23) through the second time interval counter (10), and the second delay calculation control module (23) controls the second delay controller (8) to compensate for the delay difference generated by the second 10 MHz signal.

2. The time-frequency transfer device according to claim 1, characterized in that: After the first delay calculation control module (22) completes compensating for the delay difference generated by the second 1PPs signal, the second delay calculation control module (23) is started to compensate for the delay difference generated by the second 10 MHz signal.

3. The time-frequency transfer device according to claim 1, characterized in that: When the length of the optical fiber link between the first delay calculation control module (22) and the first delay controller (5) is greater than a preset length, a plurality of the first delay controllers (5) are used in cascade connection.

4. The time-frequency transfer device according to claim 1, characterized in that: When a first 10 MHz signal loaded between the frequency distribution amplifier (1) and the second time interval counter (10) and a second 10 MHz signal loaded between the frequency distribution amplifier (1) and the second optoelectronic modulator (7) are transmitted after being frequency-multiplied to a preset frequency, parameters of the second optical detection shaping module (13), the third optical detection shaping module (19) and the second delay calculation control module (23) are adapted to the preset frequency.

5. The time-frequency transfer device according to claim 1, characterized in that: The first laser (3) and the second laser (6) are distributed feedback DFB lasers.

6. The time frequency transfer device according to claim 5, characterized in that: The first laser (3) and the second laser (6) have a wavelength of 1550 nm, a line width of less than 100 MHZ, and are connected by pigtails.

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