CN213906688U - Packaging structure and packaging system for time phase coding quantum key distribution system - Google Patents
Packaging structure and packaging system for time phase coding quantum key distribution system Download PDFInfo
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- CN213906688U CN213906688U CN202120976163.9U CN202120976163U CN213906688U CN 213906688 U CN213906688 U CN 213906688U CN 202120976163 U CN202120976163 U CN 202120976163U CN 213906688 U CN213906688 U CN 213906688U
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Abstract
The utility model discloses a packaging structure for time phase coding quantum key distribution system relates to the quantum communication field, including wait arm interferometer, first equal arm interferometer and second equal arm interferometer, wherein, the output of first equal arm interferometer is connected with wait arm interferometer's input light, and first equal arm interferometer includes first coupler, second coupler and first thermo-optic modulator; the unequal arm interferometer comprises a second coupler and a third coupler, and the first equal arm interferometer is configured to maintain the strength of optical signals input into two arms of the unequal arm interferometer consistent; the second equal-arm interferometer comprises a fourth coupler, a fifth coupler, an electro-optic modulator and a second thermo-optic modulator, is configured to prepare optical signals in a decoy state, achieves integration of a sending end of a quantum key distribution system based on time phase coding, reduces the size, reduces the cost, is easy to maintain, and improves the stability.
Description
Technical Field
The utility model relates to a quantum communication field, concretely relates to packaging structure and packaging system for time phase place coding quantum key distribution system.
Background
Quantum key distribution has recently received much attention as a brand-new secure communication technology, and in the process of quantum key distribution, photons are used as a physical carrier for secure communication and encoding is mainly performed by using the polarization state of the photons.
The quantum key distribution process can be realized by a mode of transmitting photons through an optical fiber, and can also be realized by a mode of transmitting photons through a free space (atmosphere). When photons generated by a sending end are transmitted to a receiving end through a common single-mode optical fiber or an atmosphere layer, the photons can be refracted, so that the polarization state of the photons is changed, the error rate of quantum communication can be increased by changing the polarization state of the photons, and the performance of a quantum key distribution system based on polarization state coding is poor.
In order to solve the above problems, quantum key distribution is currently mainly performed by using a quantum key distribution system based on time phase encoding. However, since components of the transmitting end of the current time phase coding-based quantum key distribution system are connected by an optical fiber and a flange, the transmitting end of the current time phase coding-based quantum key distribution system is not integrated, which results in a large volume, high cost, difficult maintenance and poor stability of the transmitting end of the current time phase coding-based quantum key distribution system.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a packaging structure and packaging system for time phase place coding quantum key distribution system for solve the defect that bulky, with high costs, difficult maintenance, stability are not high that prior art exists.
In order to achieve the above object, the embodiments of the present invention provide a package structure and a package system for a time phase coding quantum key distribution system.
In a first aspect, the embodiment of the present invention provides a package structure for a time phase coding quantum key distribution system, including equal arm interferometer, first equal arm interferometer and second equal arm interferometer, wherein:
the output end of the first equal arm interferometer is optically connected with the input end of the unequal arm interferometer;
the first equal arm interferometer comprises a first coupler, a second coupler and a first thermo-optic modulator;
the unequal arm interferometer comprises the second coupler and a third coupler;
the first equal arm interferometer is configured to maintain the intensity of the optical signals input to the two arms of the unequal arm interferometer consistent;
the second equal-arm interferometer comprises a fourth coupler, a fifth coupler, an electro-optic modulator and a second thermo-optic modulator and is configured to prepare an optical signal in a decoy state.
As a preferred embodiment of the present invention, the package structure further includes a sixth coupler, and the sixth coupler is configured to combine the first optical signal output by the unequal arm interferometer and the second optical signal output by the second equal arm interferometer to obtain a third optical signal.
As a preferred embodiment of the present invention, the sixth coupler is further configured to divide the third optical signal into two optical signals according to a set ratio and transmit one of the two optical signals to a receiving end.
As a preferred embodiment of the present invention, the electro-optical modulator is an electro-optical phase modulator.
As a preferred embodiment of the present invention, the second thermo-optic modulator is configured to maintain the intensities of the two optical signals input to the sixth coupler to be consistent.
As a preferred embodiment of the present invention, the sixth coupler and the unequal-arm interferometer and the second equal-arm interferometer are respectively optically connected by a planar optical waveguide.
As a preferred embodiment of the present invention, the unequal-arm interferometer and the first equal-arm interferometer are optically connected through a planar optical waveguide.
In a second aspect, the present invention further provides a packaging system for a time phase coded quantum key distribution system, where the packaging system includes the packaging structure of the first aspect.
The embodiment of the utility model provides an encapsulation structure and packaging system for time phase coding quantum key distribution system have following beneficial effect:
(1) the integration of the quantum key distribution system transmitting end based on time phase coding is realized, the volume of the quantum key distribution system transmitting end is reduced, and the cost is reduced;
(2) the combination of the electro-optical modulator and the Sagnac interferometer is used as an intensity modulator, so that the insertion loss is small, the precision is high, and the stability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a package structure for a time phase encoded quantum key distribution system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the package structure for a time-phase encoded quantum key distribution system provided by the embodiments of the present invention includes a coupler BS1, a coupler BS2, a coupler BS3, a coupler BS4, a coupler BS5, a coupler BS6, a thermo-optic modulator heat 1, a thermo-optic modulator heat 2, and an electro-optic modulator RF1, wherein:
the coupler BS1, the coupler BS2, and the thermo-optic modulator heat 1 are configured to form a first equal arm interferometer.
Coupler BS2 and coupler BS3 are configured to form an unequal arm interferometer.
The output end of the first equal arm interferometer is optically connected with the input end of the unequal arm interferometer.
Coupler BS5, coupler BS6, thermo-optic modulator heat 2 and electro-optic modulator RF1 are used to form a second half-arm interferometer.
The first isoarm interferometer is configured to maintain the intensity of the optical signals input to the two arms of the anisoarm interferometer consistent.
The second arm interferometer is configured to prepare the optical signal in a decoy state.
As an optional embodiment of the present invention, the coupler BS4 is configured to combine the first optical signal output by the unequal arm interferometer and the second optical signal output by the second equal arm interferometer to obtain the third optical signal.
As an alternative embodiment of the present invention, the coupler BS4 is further configured to divide the third optical signal into two optical signals according to the set ratio and transmit one of the two optical signals to the receiving end.
As an alternative embodiment of the present invention, the electro-optic modulator RF1 is an electro-optic phase modulator.
As a specific embodiment of the present invention, the coupler BS4 is optically connected to the unequal-arm interferometer and the second equal-arm interferometer through planar optical waveguides, respectively.
As a specific embodiment of the present invention, the unequal-arm interferometer and the first equal-arm interferometer are optically connected through a planar lightwave circuit.
The embodiment of the utility model provides a packaging structure for time phase coding quantum key distribution system includes waiting for arm interferometer, first wait arm interferometer and second wait arm interferometer, wherein, the output of first wait arm interferometer is connected with waiting for arm interferometer's input light, and first wait arm interferometer includes first coupler, second coupler and first thermo-optic modulator; the unequal arm interferometer comprises a second coupler and a third coupler, and the first equal arm interferometer is configured to maintain the strength of optical signals input into two arms of the unequal arm interferometer consistent; the second equal-arm interferometer comprises a fourth coupler, a fifth coupler, an electro-optic modulator and a second thermo-optic modulator, is configured to prepare optical signals in a decoy state, achieves integration of a sending end of a quantum key distribution system based on time phase coding, reduces the size, reduces the cost, is easy to maintain, and improves the stability.
It will be appreciated that the relevant features of the method and apparatus described above are referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (8)
1. A package structure for a time-phase encoded quantum key distribution system, characterized by: the interferometer comprises an unequal arm interferometer, a first equal arm interferometer and a second equal arm interferometer, wherein:
the output end of the first equal arm interferometer is optically connected with the input end of the unequal arm interferometer;
the first equal arm interferometer comprises a first coupler, a second coupler and a first thermo-optic modulator;
the unequal arm interferometer comprises the second coupler and a third coupler;
the first equal arm interferometer is configured to maintain the intensity of the optical signals input to the two arms of the unequal arm interferometer consistent;
the second equal-arm interferometer comprises a fourth coupler, a fifth coupler, an electro-optic modulator and a second thermo-optic modulator and is configured to prepare an optical signal in a decoy state.
2. The package structure for a time-phase encoded quantum key distribution system of claim 1, further comprising:
a sixth coupler configured to combine the first optical signal output by the unequal arm interferometer and the second optical signal output by the second equal arm interferometer to obtain a third optical signal.
3. The package structure for a time-phase encoded quantum key distribution system of claim 2, wherein:
the sixth coupler is further configured to split the third optical signal into two optical signals according to energy and transmit one of the two optical signals to a receiving end according to a set ratio.
4. The package structure for a time-phase encoded quantum key distribution system of claim 3, wherein:
the electro-optic modulator is an electro-optic phase modulator.
5. The package structure for a time-phase encoded quantum key distribution system of claim 4, wherein:
the second thermo-optic modulator is configured to maintain the intensities of the two optical signals input into the sixth coupler consistent.
6. The package structure for a time-phase encoded quantum key distribution system of claim 2, wherein:
and the sixth coupler is optically connected with the unequal-arm interferometer and the second equal-arm interferometer through planar optical waveguides respectively.
7. The package structure for a time-phase encoded quantum key distribution system of claim 1, wherein:
the unequal arm interferometer is optically connected with the first equal arm interferometer through a planar optical waveguide.
8. A packaging system for a time-phase encoded quantum key distribution system, comprising a packaging structure according to any of claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499686A (en) * | 2022-01-28 | 2022-05-13 | 中国科学技术大学 | Receiving end system of quantum key distribution system applied to optical chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499686A (en) * | 2022-01-28 | 2022-05-13 | 中国科学技术大学 | Receiving end system of quantum key distribution system applied to optical chip |
| CN114499686B (en) * | 2022-01-28 | 2023-11-28 | 中国科学技术大学 | Receiving end system applied to quantum key distribution system of optical chip |
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