CN213094209U - Optical fiber transmission system - Google Patents
Optical fiber transmission system Download PDFInfo
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- CN213094209U CN213094209U CN202022017539.1U CN202022017539U CN213094209U CN 213094209 U CN213094209 U CN 213094209U CN 202022017539 U CN202022017539 U CN 202022017539U CN 213094209 U CN213094209 U CN 213094209U
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Abstract
The utility model provides an optical fiber transmission system, including transmitting terminal and receiving terminal, optical fiber transmission system includes the light transmission unit respectively at transmitting terminal and receiving terminal, with a pair of fiber link who is connected the light transmission unit, a serial communication port, optical fiber transmission system still includes quantum key distribution equipment, optic fibre time synchronization equipment, switch and the wavelength division multiplexing equipment that arranges in pairs respectively at transmitting terminal and receiving terminal, and wherein, quantum key distribution equipment, optic fibre time synchronization equipment and the switch of transmitting terminal and receiving terminal pass through the wavelength division multiplexing equipment only uses a fiber link in a pair of fiber link connects each other through multiplexing in order to transmit light signal. According to the utility model discloses a technical scheme has improved the availability factor of optic fibre resource in multiplexing an optic fibre to current optical transmission module with quantum key distribution equipment and time synchronization equipment, the cost is reduced by a wide margin.
Description
Technical Field
The utility model relates to a quantum communication network technique and optical transmission technical field, more specifically relate to a system of quantum key distribution and time synchronization system transmission of sharing fine.
Background
Quantum Key Distribution (QKD) is a process of preparing, transmitting, receiving and purifying information by using a quantum system to obtain a secure symmetric key which cannot be stolen by others in principle, and this process can ensure that keys obtained by two communication parties are completely consistent, and any third party cannot obtain any information about the key. The sending party of the optical fiber quantum key distribution system needs to send quantum light and synchronous light to the receiving party, and meanwhile, the two parties need to send data to each other for key agreement.
The fiber time synchronization device (hereinafter abbreviated to FTTS) can implement accurate time synchronization between two locations, and in the bidirectional time synchronization, not only the master clock transmits a synchronization signal to the slave clock, but also the slave clock transmits a synchronization signal to the master clock, thereby forming a bidirectional link, as shown in fig. 1. The master clock measures the arrival time of the slave clock synchronization signal, and the slave clock measures the arrival time of the master clock synchronization signal. Then, the data are measured at the time of interaction, the clock difference between the slave clock and the master clock is calculated, and the time of the slave clock is fed back, so that the slave clock is calibrated to the time of the master clock.
At present, quantum key distribution equipment and time synchronization equipment use independent optical fibers for transmission. This approach is costly due to the scarcity of fiber resources.
SUMMERY OF THE UTILITY MODEL
Aiming at the defect that the optical fiber multiplexing of equipment is not considered in the prior art, the method aims to solve the problem of common optical fiber transmission of quantum key distribution equipment, time synchronization equipment and the existing network equipment, and designs a new wavelength division multiplexing scheme so as to reduce the requirements of various equipment on optical fiber resources.
For this reason, according to the utility model discloses an optical transmission link is based on the optical fiber resource that has used to an optical fiber transmission system is provided, including transmitting terminal and receiving terminal, optical fiber transmission system include the optical transmission unit respectively at transmitting terminal and receiving terminal, with a pair of fiber link who is connected the optical transmission unit, optical fiber transmission system still includes quantum key distribution equipment, optic fibre time synchronization equipment, switch and the wavelength division multiplexing equipment that arrange in pairs respectively at transmitting terminal and receiving terminal, wherein, quantum key distribution equipment, the optic fibre time synchronization equipment and the switch of transmitting terminal and receiving terminal pass through wavelength division multiplexing equipment only uses one optical fiber link in a pair of optical fiber link connects each other through multiplexing in order to transmit optical signal.
According to the utility model discloses a preferred embodiment, wavelength division multiplexing equipment still includes first wavelength division multiplexer, second wavelength division multiplexer and the third wavelength division multiplexer of arranging in pairs at the transmitting terminal with the receiving terminal, wherein, at the transmitting terminal: the synchronous light and the quantum light of the quantum key distribution equipment are combined through the first wavelength division multiplexer, the optical signals of the switch, the time synchronization equipment and the optical transmission unit are combined through the second wavelength division multiplexer, two paths of combined optical signals which are combined through the first wavelength division multiplexer and the second wavelength division multiplexer are combined through the third wavelength division multiplexer to form a single path of combined optical signal, and the path of combined optical signal is transmitted to a receiving end through one optical fiber link of the pair of optical fiber links; wherein, at the receiving end: the third wavelength division multiplexer divides the received one-path combined optical signal into two paths, wherein one path is further divided into quantum light and synchronous light by the first wavelength division multiplexer and transmitted to quantum key distribution equipment of a receiving end, and the other path is further divided into three paths of optical signals by the second wavelength division multiplexer and transmitted to an exchanger, time synchronization equipment and an optical transmission unit of the receiving end respectively.
Preferably, the first wavelength division multiplexer is a quantum wavelength division multiplexer, the second wavelength division multiplexer is a sparse wavelength division multiplexer, and the third wavelength division multiplexer is a filter type wavelength division multiplexer.
According to a more preferred embodiment, in said one optical fiber link: the quantum key distribution equipment transmits and receives quantum light in a 1550nm waveband, the quantum key distribution equipment transmits and receives synchronous light in a 1570nm waveband, the optical fiber time synchronization equipment transmits bidirectional optical signals in an 1330/1350nm waveband, the optical transmission unit transmits unidirectional optical signals in a 1310nm waveband, and the switch transmits bidirectional optical signals in a 1270/1290nm waveband.
Alternatively, the first wavelength division multiplexer is a quantum wavelength division multiplexer, the second wavelength division multiplexer is a dense wavelength division multiplexer, and the third wavelength division multiplexer is a filtered wavelength division multiplexer.
According to another more preferred embodiment, in said one optical fiber link: the quantum key distribution equipment transmits and receives quantum light in a 1310nm waveband, the quantum key distribution equipment transmits and receives synchronous light in a 1490nm waveband, the optical fiber time synchronization equipment performs bidirectional optical signal transmission in a 1550nm waveband, the optical transmission unit performs unidirectional optical signal transmission in the 1550nm waveband, and the switch performs bidirectional optical signal transmission in the 1550nm waveband.
According to the utility model discloses a technical scheme has improved the availability factor of optic fibre resource in multiplexing an optic fibre to current optical transmission module with quantum key distribution equipment and time synchronization equipment, the cost is reduced by a wide margin. Moreover, the relevant devices of the wavelength division multiplexing equipment used in the technical scheme of the utility model are mature devices, and are easy to integrate and produce.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of clock synchronization of a prior art optical fiber time synchronization device;
fig. 2 is a schematic wavelength division multiplexing transmission diagram of an optical transmission system according to an embodiment of the present invention;
fig. 3 is a schematic wavelength division multiplexing transmission diagram of an optical transmission system according to another embodiment of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments. It is to be understood that the embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present invention. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses a transmission link is based on the fiber resource who has used, and original OTU equipment utilizes a pair of fibre core to carry out two-way classic data transmission on the link. Now, quantum key distribution equipment and optical fiber time synchronization equipment need to be superposed on a link, and the scheme superposes the quantum key distribution equipment and the optical fiber time synchronization equipment on one optical fiber.
Example 1:
in this embodiment, the QKD quantum light uses 1550nm C band, and Switch, FTTS, OTU use 1310nm O band.
As shown in fig. 2, the new wavelength division multiplexing device is shown in the dotted frame. And the QKD-A sends 1570nm synchronous light and 1550nm quantum light to enter a QWDM combiner. And the QKD negotiation data is sent to a Switch-1, and the Switch contains an optical module and converts the data into 1270/1290nm bidirectional classical optical signals. The optical fiber time synchronization device FTTS-1 sends and receives bidirectional time transfer optical signals with the wavelength of 1330/1350nm respectively. The original optical transmission unit OTU-1 uses 1310nm classical optical signals for unidirectional data transmission. The light of Switch-1, FTTS-1 and OTU-1 is combined by CWDM. And finally, combining the light with 1310nm wave band and 1550nm wave band by using 1310/1550nm FWDM-1.
The other end is just opposite, the 1550nm and 1310nm light is separated by 1310/1550nm FWDM-2, and then the 1550nm quantum light and 1570nm synchrotron light are separated by QWDM into QKD-B. 1270/1290/1310/1330/1350nm light is split by CWDM into Switch-2, FTTS-2, and OTU-2, respectively.
Those skilled in the art will appreciate that interchanging the positions of QKD-a and QKD-B does not affect the deployment of the solution.
Typical parameters of the device of this example are as follows:
example 2:
in example 2, the QKD quantum light employs 1310nm O band, and the Switch, FTTS, OTU employ 1550nm C band.
As shown in fig. 3, the new wavelength division multiplexing device is shown in the dotted frame. The QKD-A sends 1490nm synchronous light and 1310nm quantum light into a QWDM combiner. Switch-1, FTTS-1, OTU-1 all use a DWDM wave channel of 1550nm C wave band, utilize DWDM to enter the light combiner. 1310/1490nm/1550nm are combined by FWDM.
The other end is just opposite, the 1550nm and 1310/1490nm light is separated by FWDM, then the 1310nm quantum light and the 1490nm sync light are separated by QWDM into QKD-B. The 1550nm light is split by DWDM into Switch-2, FTTS-2, and OTU-2, respectively.
Those skilled in the art will appreciate that interchanging the positions of QKD-a and QKD-B does not affect the deployment of the solution.
Typical parameters of the device of this example are as follows:
the basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
List of terms:
quantum Key Distribution device
OTU: optical Transform Unit Optical Transmission Unit
FTTS optical fiber time synchronization equipment
QWDM: quantum wavelet Division Multiplexer
CWDM (Coarse Wavelength Division multiplexing) Multiplexer
DWDM, Dense wavelet Division Multiplexer
FWDM is a Filter wavelet Division Multiplexer.
Claims (6)
1. An optical fiber transmission system is characterized in that the optical fiber transmission system comprises a transmitting end and a receiving end, the optical fiber transmission system respectively comprises an optical transmission unit and a pair of optical fiber links connected with the optical transmission unit at the transmitting end and the receiving end, the optical fiber transmission system also respectively comprises quantum key distribution equipment, optical fiber time synchronization equipment, a switch and wavelength division multiplexing equipment which are arranged in pairs at the transmitting end and the receiving end, and the quantum key distribution equipment, the optical fiber time synchronization equipment and the switch of the transmitting end and the receiving end are connected with each other through multiplexing by only using one optical fiber link in the pair of optical fiber links through the wavelength division multiplexing equipment so as to transmit optical signals.
2. The optical fiber transmission system according to claim 1, wherein the wavelength division multiplexing device further comprises a first wavelength division multiplexer, a second wavelength division multiplexer, and a third wavelength division multiplexer arranged in a pair at a transmitting end and a receiving end, wherein at the transmitting end: the synchronous light and the quantum light of the quantum key distribution equipment are combined through the first wavelength division multiplexer, the optical signals of the switch, the time synchronization equipment and the optical transmission unit are combined through the second wavelength division multiplexer, two paths of combined optical signals which are combined through the first wavelength division multiplexer and the second wavelength division multiplexer are combined through the third wavelength division multiplexer to form a single path of combined optical signal, and the path of combined optical signal is transmitted to a receiving end through one optical fiber link of the pair of optical fiber links; wherein, at the receiving end: the third wavelength division multiplexer divides the received one-path combined optical signal into two paths, wherein one path is further divided into quantum light and synchronous light by the first wavelength division multiplexer and transmitted to quantum key distribution equipment of a receiving end, and the other path is further divided into three paths of optical signals by the second wavelength division multiplexer and transmitted to an exchanger, time synchronization equipment and an optical transmission unit of the receiving end respectively.
3. The optical fiber transmission system according to claim 2, wherein the first wavelength division multiplexer is a quantum wavelength division multiplexer, the second wavelength division multiplexer is an sparse wavelength division multiplexer, and the third wavelength division multiplexer is a filtered wavelength division multiplexer.
4. The optical fiber transmission system according to claim 2, wherein the first wavelength division multiplexer is a quantum wavelength division multiplexer, the second wavelength division multiplexer is a dense wavelength division multiplexer, and the third wavelength division multiplexer is a filtered wavelength division multiplexer.
5. The optical fiber transmission system according to claim 3, wherein in the one optical fiber link: the quantum key distribution equipment transmits and receives quantum light in a 1550nm waveband, the quantum key distribution equipment transmits and receives synchronous light in a 1570nm waveband, the optical fiber time synchronization equipment transmits bidirectional optical signals in an 1330/1350nm waveband, the optical transmission unit transmits unidirectional optical signals in a 1310nm waveband, and the switch transmits bidirectional optical signals in a 1270/1290nm waveband.
6. The optical fiber transmission system according to claim 4, wherein in the one optical fiber link: the quantum key distribution equipment transmits and receives quantum light in a 1310nm waveband, the quantum key distribution equipment transmits and receives synchronous light in a 1490nm waveband, the optical fiber time synchronization equipment performs bidirectional optical signal transmission in a 1550nm waveband, the optical transmission unit performs unidirectional optical signal transmission in the 1550nm waveband, and the switch performs bidirectional optical signal transmission in the 1550nm waveband.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022017539.1U CN213094209U (en) | 2020-09-15 | 2020-09-15 | Optical fiber transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022017539.1U CN213094209U (en) | 2020-09-15 | 2020-09-15 | Optical fiber transmission system |
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| CN213094209U true CN213094209U (en) | 2021-04-30 |
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