CN110620662A - Integrated waveguide polarization orthogonal rotation reflection device and quantum key distribution system - Google Patents
Integrated waveguide polarization orthogonal rotation reflection device and quantum key distribution system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
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Abstract
There is provided an integrated waveguide polarization orthogonal rotating reflective device and quantum key distribution system, the device comprising: the integrated waveguide polarization beam splitting and rotating device comprises a first port, a second port and a third port, and is configured to polarizedly split one path of input light pulse input through the first port into a first path of light pulse output through the second port and a second path of light pulse output through the third port, and rotate the polarization state of one of the first path of light pulse and the second path of light pulse, so that the polarization states of the two paths of light pulses after rotation are the same; and an integrated waveguide transmission optical path disposed between the second and third ports, configured to transmit optical pulses output from either of the second and third ports back to the other of the second and third ports, the polarization splitting rotation apparatus being further configured to, after receiving the first and second optical pulses returned through the integrated waveguide transmission optical path, combine them and output through the first port. The integrated waveguide polarization orthogonal rotation reflecting device can increase the reliability and stability of the system.
Description
Technical Field
The invention relates to the technical field of optical transmission secret communication, in particular to an integrated waveguide polarization orthogonal rotation reflecting device, an integrated waveguide coding and decoding device comprising the integrated waveguide polarization orthogonal rotation reflecting device and a corresponding quantum key distribution system.
Background
The quantum secret communication technology is a leading-edge hotspot field combining quantum physics and information science. Based on quantum key distribution technology and one-time pad cipher principle, quantum secret communication can realize the safe transmission of information in public channel. The quantum key distribution is based on the physical principles of quantum mechanics Heisebauer uncertain relation, quantum unclonable theorem and the like, the secret key can be safely shared among users, potential eavesdropping behavior can be detected, and the quantum key distribution method can be applied to the fields of high-safety information transmission requirements of national defense, government affairs, finance, electric power and the like.
At present, most of light path modules of quantum key distribution equipment are integrated by adopting discrete optical devices, are easily influenced by vibration and environmental stability change, further influence the stability and reliability of equipment at two ends of a system, and have large equipment volume. Especially, the optical path of the quantum key distribution coding and decoding module has many optical devices, is difficult to design disc fibers, and is unstable in coding and decoding due to environmental interference. In addition, phase encoding and time bit-phase encoding quantum key distribution systems have non-ideal conditions due to the manufacturing of optical fibers, and the optical fibers are affected by temperature, strain, bending and the like in actual environments, so that random birefringence effects can be generated. Therefore, after the optical pulse is transmitted by the long-distance optical fiber and transmitted by the two-arm optical fiber of the unequal-arm interferometer, the problem of polarization-induced fading exists during decoding interference, and the decoding interference is unstable.
How to realize integrated stable interference decoding is an urgent problem to be solved for quantum secret communication application based on the existing optical cable infrastructure.
Disclosure of Invention
The invention mainly aims to provide an integrated waveguide polarization orthogonal rotation reflection device, an integrated waveguide coding and decoding device based on the integrated waveguide polarization orthogonal rotation reflection device and a quantum key distribution system based on the integrated waveguide coding and decoding device, so as to solve the difficult problem of unstable phase decoding interference and the difficult problem of integration of coding and decoding optical paths caused by polarization induced fading in phase coding and time bit-phase coding quantum key distribution application.
The invention provides at least the following technical scheme:
1. an integrated waveguide polarization orthogonal rotating reflective device, comprising: an integrated waveguide polarization beam splitting and rotating device and an integrated waveguide transmission optical path, wherein,
the integrated waveguide polarization beam splitting and rotating device comprises a first port, a second port and a third port, and is configured to polarizedly split one path of input light pulses input through the first port into a first path of light pulses and a second path of light pulses output through the second port and the third port, and rotate the polarization state of one of the first path of light pulses and the second path of light pulses, so that the polarization states of the first path of light pulses and the second path of light pulses are the same after rotation; and the number of the first and second groups,
the integrated waveguide transmission optical path disposed between and optically coupled with the second port and the third port of the integrated waveguide polarization beam splitting rotation device, the integrated waveguide transmission optical path configured to transmit optical pulses respectively output from either of the second port and the third port back to the other of the second port and the third port,
the integrated waveguide polarization beam splitting and rotating device is further configured to combine and output the first light pulse and the second light pulse which return through the integrated waveguide transmission optical path after receiving the first light pulse and the second light pulse.
2. The integrated waveguide polarization orthogonal rotation reflection apparatus according to claim 1, wherein the integrated waveguide polarization beam splitting rotation apparatus is a polarization beam splitting rotator.
3. The integrated waveguide polarization orthogonal rotation reflection apparatus according to claim 1, wherein the integrated waveguide polarization beam splitting rotation apparatus comprises a polarization beam splitter and a polarization rotator optically coupled to one of two output ports of the polarization beam splitter, wherein the input port of the polarization beam splitter is the first port of the integrated waveguide polarization beam splitting rotation apparatus, and the polarization rotator is disposed on one of two output optical paths of the polarization beam splitter to rotate the polarization state of the optical pulse transmitted therethrough.
4. The integrated waveguide polarization orthogonal rotation reflection apparatus according to any one of claims 1 to 3, further comprising an integrated waveguide phase modulator located on the integrated waveguide transmission optical path and configured to phase modulate optical pulses transmitted through the integrated waveguide transmission optical path according to a quantum key distribution protocol.
5. An integrated waveguide codec, comprising: a beam splitter; and two reflecting means optically coupled to said beam splitter via two arms, respectively;
wherein one or each of the two reflecting means is an integrated waveguide polarization orthogonal rotating reflecting means according to any of aspects 1-4 and is coupled to a respective one of the two arms via an input port of the integrated waveguide polarization orthogonal rotating reflecting means.
6. The integrated waveguide codec according to claim 5, further comprising a phase modulator disposed in front of the input port of the splitter or disposed on at least one of the two arms.
7. The integrated waveguide codec device according to claim 5 or 6, wherein the beam splitter is a polarization maintaining beam splitter; and/or the two arms are polarization maintaining optical paths, respectively.
8. The integrated waveguide codec device according to claim 5 or 6, further comprising: an optical circulator including a first port, a second port and a third port, the first port of the optical circulator being disposed in front of the input port of the beam splitter to receive an incoming one-way input optical pulse, the input optical pulse being output from the second port of the optical circulator to the beam splitter, and an optical pulse output from the beam splitter by combining is input through the second port of the optical circulator and output from the third port of the optical circulator.
9. A phase encoded quantum key distribution system, comprising:
the integrated waveguide coding and decoding device according to any one of schemes 5 to 8, which is arranged at a receiving end of the quantum key distribution system and used for phase decoding; and/or
The integrated waveguide codec device according to any one of claims 5 to 8, which is provided at a transmitting end of the quantum key distribution system, and is used for phase encoding.
10. A time-bit-phase encoded quantum key distribution system, comprising:
the integrated waveguide coding and decoding device according to any one of schemes 5 to 8, which is arranged at a receiving end of the quantum key distribution system and is used for time bit-phase decoding; and/or
The integrated waveguide codec device according to any one of claims 5 to 8, which is provided at a transmitting end of the quantum key distribution system, and is used for time bit-phase encoding.
11. The time-bit-phase-encoded quantum key distribution system according to claim 10, wherein when the integrated waveguide codec device according to any one of claims 5 to 8 is disposed at a receiving end of the quantum key distribution system for time-bit-phase decoding, the integrated waveguide codec device is configured to decode an input optical pulse in each pulse cycle into a signal output of a first time slot, a second time slot, and a third time slot, where each pulse cycle includes the first time slot, the second time slot, and the third time slot.
12. The time-bit-phase encoded quantum key distribution system according to claim 10, wherein when the integrated waveguide codec device according to any one of claims 5 to 8 is disposed at a receiving end of the quantum key distribution system for time-bit-phase decoding, the time-bit-phase encoded quantum key distribution system further includes a pre-splitter, and one of two output ports of the pre-splitter is optically coupled to the integrated waveguide codec device.
The invention designs a polarization orthogonal rotation reflection device by adopting an integrated waveguide, and provides a scheme of the integrated waveguide coding and decoding device and the quantum key distribution system based on the polarization orthogonal rotation reflection device, so that stable decoding interference output of a phase base in a phase coding and time bit-phase coding quantum key distribution system can be realized for input optical pulses in any polarization state, and the problem that the system cannot work stably due to polarization induced fading in quantum key distribution application is solved. In addition, the integrated waveguide design is adopted, the volume of a decoding optical path is greatly reduced, and the reliability and the stability of the terminal equipment are improved. The invention provides an integrally applied quantum key distribution decoding scheme for resisting polarization-induced fading.
Drawings
FIG. 1 is a schematic diagram of the structure of an integrated waveguide polarization orthogonal rotation reflection apparatus according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of an integrated waveguide polarization orthogonal rotation reflection apparatus according to another preferred embodiment of the present invention;
fig. 3 is a schematic structural diagram of an integrated waveguide codec device according to a preferred embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention. For the purpose of clarity and simplicity, a detailed description of known functions and configurations of devices described herein will be omitted when it may obscure the subject matter of the present invention.
An integrated waveguide polarization orthogonal rotation reflection apparatus according to a preferred embodiment of the present invention is shown in fig. 1, and includes the following components: an integrated waveguide polarization beam splitting rotation device 102 and an integrated waveguide transmission optical path 103.
Specifically, the integrated waveguide polarization beam splitting rotation device 102 includes a first port a (i.e., port 101), a second port B, and a third port C. The first port A can be used as an input port and an output port of the integrated waveguide polarization orthogonal rotation reflection device. The integrated waveguide polarization beam splitting rotation device 102 is configured to polarizedly split one path of input light pulses input via the first port a into a first path of light pulses and a second path of light pulses output via the second port B and the third port C, and rotate a polarization state of one of the first path of light pulses and the second path of light pulses, so that the polarization states of the first path of light pulses and the second path of light pulses are the same after rotation.
The integrated waveguide transmission optical path 103 is disposed between and optically coupled with the second port B and the third port C of the integrated waveguide polarization splitting rotation device 102, such that the two output ports B and C of the integrated waveguide polarization splitting rotation device 102 implement optical path interconnection. The integrated waveguide transmission optical path 103 is configured to transmit optical pulses respectively output from either of the second port B and the third port C back to the other of the second port B and the third port C.
The integrated waveguide polarization beam splitting and rotating device 102 is further configured to, after receiving the first and second optical pulses returned through the integrated waveguide transmission optical path 103, combine the returned first and second optical pulses and output the combined light through the first port a of the integrated waveguide polarization beam splitting and rotating device 102.
In one embodiment, the integrated waveguide polarization beam splitting rotation device 102 may be a polarization beam splitting rotator.
In another embodiment, the integrated waveguide polarization beam splitting rotation device 102 may also be a device constructed from a polarization beam splitter and a polarization rotator. For example, the integrated waveguide polarization beam splitting and rotating device includes a polarization beam splitter and a polarization rotator optically coupled to one of two output ports of the polarization beam splitter, wherein the input port of the polarization beam splitter is the first port of the integrated waveguide polarization beam splitting and rotating device is disposed on one of two output optical paths of the polarization beam splitter to rotate the polarization state of the optical pulse transmitted therethrough. In this case, the input port of the polarization beam splitter may be the input port of the integrated waveguide polarization beam splitting rotation device 102, and the polarization rotator may be located on one of the two output optical paths of the polarization beam splitter.
In one possible embodiment, the integrated waveguide polarization quadrature rotation reflective device further comprises an integrated waveguide phase modulator, which may be located on the integrated waveguide transmission optical path 103 and configured to phase modulate optical pulses transmitted through the integrated waveguide transmission optical path according to a quantum key distribution protocol.
An integrated waveguide polarization orthogonal rotation reflection device according to another preferred embodiment of the present invention is shown in fig. 2, and includes the following components: a polarization beam splitter rotator 202, an integrated waveguide transmission optical path 203, and an integrated waveguide phase modulator 204.
The polarization beam splitter rotator 202 has one input port F (i.e., port 201, which may also be referred to as a first port), two output ports G and H (which may also be referred to as a second port and a third port, respectively). The input port F of the polarization beam splitting rotator 202 is the input port and the output port of the integrated waveguide polarization orthogonal rotation reflection device. Two output ports G and H of the polarization beam splitting rotator 202 are optically coupled to ports at both ends of the integrated waveguide transmission optical path 203, respectively. An integrated waveguide phase modulator 204 is disposed on the integrated waveguide transmission optical path 203. Advantageously, the transmission or coupling optical paths in fig. 1 or 2 are both integrated waveguides.
During operation, an optical pulse enters the polarization beam splitting rotator 202 through the input port 201 of the polarization beam splitting rotator 202 and is split into two optical pulses by the polarization beam splitting rotator 202, and the two optical pulses are output from the port G and the port H of the polarization beam splitting rotator 202 respectively. One path of optical pulse output from the port G of the polarization beam splitting rotator 202 is transmitted to the port D of the integrated waveguide phase modulator 204 through the integrated waveguide transmission optical path 203, and then is phase-modulated by the integrated waveguide phase modulator 204 and output to the port H of the polarization beam splitting rotator 202 through the port E of the integrated waveguide phase modulator 204. Correspondingly, the other optical pulse output from the port H of the polarization beam splitting rotator 202 is transmitted to the port E of the integrated waveguide phase modulator 204 through the integrated waveguide transmission optical path 203, and then is phase-modulated by the integrated waveguide phase modulator 204 and output to the port G of the polarization beam splitting rotator 202 through the port D of the integrated waveguide phase modulator 204. The polarization beam splitter rotator 202 combines the optical pulses returned from the integrated waveguide transmission optical path 203 to the port G and the port H, and outputs the combined optical pulses through the port F of the polarization beam splitter rotator 202. Preferably, the integrated waveguide phase modulator 204 is located in the middle of the integrated waveguide transmission optical path 203.
According to another aspect of the present invention, an integrated waveguide codec is also claimed. An integrated waveguide encoding and decoding device according to a preferred embodiment of the present invention is shown in fig. 3, and includes the following components: a beam splitter 303 and two reflecting means 304 and 305 optically coupled to the beam splitter via two arms, respectively. One or each of the two reflecting means may be an integrated waveguide polarization orthogonal rotating reflecting means as described above and coupled to a respective one of the two arms via an input port of the integrated waveguide polarization orthogonal rotating reflecting means.
Preferably, the beam splitter 303 is a polarization maintaining beam splitter; and/or the two arms are polarization maintaining optical paths, respectively. In addition, the integrated waveguide codec device may further include a phase modulator disposed at a front end of the input port of the beam splitter or disposed on at least one of the two arms.
Preferably, in one embodiment, both reflective devices 304 and 305 are the integrated waveguide polarization orthogonal rotation reflective devices described above. The two reflecting means may be identically constructed polarization orthogonal rotating reflecting means or differently constructed polarization orthogonal rotating reflecting means. For example, one of reflective devices 304 and 305 (e.g., reflective device 304) may comprise a polarization beam splitter rotator, an integrated waveguide phase modulator, and an integrated waveguide transmission optical path, and the other of reflective devices 304 and 305 (e.g., reflective device 305) may comprise a polarization beam splitter rotator and an integrated waveguide transmission optical path.
The polarization maintaining beam splitter 303 may be provided with two ports on the left and two ports on the right, as shown in fig. 3. Alternatively, only one port may be provided on the left side of the polarization maintaining beam splitter (e.g., only port 301) and two ports may be provided on the right side. The two ports on the right side of the polarization maintaining beam splitter 303 are connected with two reflecting devices respectively. One port on the left of the polarization-maintaining beam splitter can be used as an input port and an output port of the coding and decoding device (in this case, an optical circulator is also needed to be arranged).
In connection with the example of fig. 3, in an embodiment, the integrated waveguide codec device is provided with only one output port, for example, one of the two ports 301 and 302 on the left side of the polarization maintaining splitter is used as an input port of the integrated waveguide codec device, and the other of the two ports 301 and 302 is used as an output port of the integrated waveguide codec device. In another embodiment, the integrated waveguide codec is provided with only one output port, e.g. one of the two ports 301 and 302 to the left of the polarization maintaining splitter is both the input port and the output port of the integrated waveguide codec, in which case an optical circulator is required. In yet another embodiment, the integrated waveguide codec is provided with two output ports, for example, both ports 301 and 302 are output ports of the integrated waveguide codec, in which case one port is both an input port and an output port, and an optical circulator is required.
Therefore, in the case where the input port and one of the output ports of the polarization maintaining beam splitter 303 are the same port, the integrated waveguide codec device may further include an optical circulator (not shown) disposed at the front end of the polarization maintaining beam splitter 303. The optical circulator may include a first port, a second port and a third port, the first port of the optical circulator is disposed at a front end of the input port of the beam splitter to receive any one of the input optical pulses, which are input from the second port of the optical circulator to the beam splitter, and the optical pulses output from the combined beam of the beam splitter are input through the second port of the optical circulator and output from the third port of the optical circulator.
Polarization-maintaining beam splitter 303 and reflecting devices 304 and 305 form an unequal-arm michelson interferometer, with the two arms in between preferably being polarization-maintaining optical paths. One of the reflecting means 304 and 305, for example reflecting means 304, may comprise an integrated waveguide phase modulator. The port 301 or 302 of the polarization maintaining beam splitter 303 can be used as an output port of the integrated waveguide codec.
In operation, an optical pulse enters the polarization maintaining beam splitter 303 through the port 301 or 302 of the polarization maintaining beam splitter 303 and is split into two optical pulses by the polarization maintaining beam splitter 303. One path of light pulse from the polarization maintaining beam splitter 303 is transmitted to the reflection device 304 through the polarization maintaining optical path and reflected back by the reflection device 304, and the other path of light pulse is transmitted to the reflection device 305 through the polarization maintaining optical path and reflected back by the reflection device 305. The two reflected optical pulses with relative delays are combined by the polarization-maintaining beam splitter 303 and then output from the port 301 or 302. The optical pulses transmitted therethrough are phase modulated by an integrated waveguide phase modulator included in one of the reflecting devices 304 and 305 (e.g., reflecting device 304).
According to another aspect of the present invention, there is also provided a phase-encoded quantum key distribution system, comprising: the integrated waveguide coding and decoding device is arranged at the receiving end of the quantum key distribution system and is used for phase decoding; and/or the integrated waveguide coding and decoding device is arranged at the transmitting end of the quantum key distribution system and is used for phase coding.
According to still another aspect of the present invention, there is also provided a time-bit-phase encoded quantum key distribution system, including: the integrated waveguide coding and decoding device is arranged at the receiving end of the quantum key distribution system and is used for time bit-phase decoding; and/or the integrated waveguide coding and decoding device is arranged at the transmitting end of the quantum key distribution system and is used for time bit-phase coding.
In one embodiment, when the integrated waveguide codec is configured at a receiving end of the quantum key distribution system for time bit-phase decoding, the integrated waveguide codec is configured to decode an input optical pulse in each pulse period into a signal output of a first time slot, a second time slot, and a third time slot, where each pulse period includes the first time slot, the second time slot, and the third time slot.
In one embodiment, when the integrated waveguide codec device is disposed at a receiving end of the quantum key distribution system for time bit-phase decoding, the time bit-phase encoded quantum key distribution system further includes a front beam splitter, and one of two output ports of the front beam splitter is optically coupled to the integrated waveguide codec device.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings that all such modifications as fall within the true spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (12)
1. An integrated waveguide polarization orthogonal rotating reflective device, comprising: an integrated waveguide polarization beam splitting and rotating device and an integrated waveguide transmission optical path, wherein,
the integrated waveguide polarization beam splitting and rotating device comprises a first port, a second port and a third port, and is configured to polarizedly split one path of input light pulses input through the first port into a first path of light pulses and a second path of light pulses output through the second port and the third port, and rotate the polarization state of one of the first path of light pulses and the second path of light pulses, so that the polarization states of the first path of light pulses and the second path of light pulses are the same after rotation; and the number of the first and second groups,
the integrated waveguide transmission optical path disposed between and optically coupled with the second port and the third port of the integrated waveguide polarization beam splitting rotation device, the integrated waveguide transmission optical path configured to transmit optical pulses respectively output from either of the second port and the third port back to the other of the second port and the third port,
the integrated waveguide polarization beam splitting and rotating device is further configured to combine and output the first light pulse and the second light pulse which return through the integrated waveguide transmission optical path after receiving the first light pulse and the second light pulse.
2. The integrated waveguide polarization orthogonal rotating reflective device of claim 1, wherein the integrated waveguide polarization beam splitting rotating device is a polarization beam splitting rotator.
3. The integrated waveguide polarization orthogonal rotation reflective device of claim 1, wherein the integrated waveguide polarization beam splitting rotation device comprises a polarization beam splitter and a polarization rotator optically coupled to one of two output ports of the polarization beam splitter, wherein the input port of the polarization beam splitter is a first port of the integrated waveguide polarization beam splitting rotation device, and the polarization rotator is disposed on one of two output optical paths of the polarization beam splitter to rotate a polarization state of an optical pulse transmitted therethrough.
4. An integrated waveguide polarization quadrature rotation reflection arrangement according to any one of claims 1 to 3, further comprising an integrated waveguide phase modulator located on the integrated waveguide transmission light path and configured for phase modulating optical pulses transmitted through the integrated waveguide transmission light path according to a quantum key distribution protocol.
5. An integrated waveguide codec, comprising: a beam splitter; and two reflecting means optically coupled to said beam splitter via two arms, respectively;
wherein one or each of the two reflecting means is an integrated waveguide polarization orthogonal rotating reflecting means according to any of claims 1-4 and is coupled to a respective one of the two arms via an input port of the integrated waveguide polarization orthogonal rotating reflecting means.
6. The integrated waveguide codec of claim 5, further comprising a phase modulator disposed in front of the input port of the splitter or disposed on at least one of the two arms.
7. An integrated waveguide codec device according to claim 5 or 6, wherein the beam splitter is a polarization maintaining beam splitter; and/or the two arms are polarization maintaining optical paths, respectively.
8. An integrated waveguide codec device according to claim 5 or 6, further comprising: an optical circulator including a first port, a second port and a third port, the first port of the optical circulator being disposed in front of the input port of the beam splitter to receive an incoming one-way input optical pulse, the input optical pulse being output from the second port of the optical circulator to the beam splitter, and an optical pulse output from the beam splitter by combining is input through the second port of the optical circulator and output from the third port of the optical circulator.
9. A phase encoded quantum key distribution system, comprising:
an integrated waveguide codec device according to any one of claims 5 to 8, arranged at a receiving end of the quantum key distribution system for phase decoding; and/or
An integrated waveguide codec device according to any one of claims 5 to 8, provided at a transmitting end of the quantum key distribution system for phase encoding.
10. A time-bit-phase encoded quantum key distribution system, comprising:
an integrated waveguide codec device according to any one of claims 5 to 8, arranged at a receiving end of the quantum key distribution system for temporal bit-phase decoding; and/or
An integrated waveguide codec device according to any one of claims 5 to 8, arranged at a transmitting end of the quantum key distribution system for time bit-phase encoding.
11. A time-bit-phase encoded quantum key distribution system according to claim 10, wherein the integrated waveguide codec according to any one of claims 5 to 8 is configured to decode input optical pulses in each pulse period into signal outputs of a first time slot, a second time slot and a third time slot, when the integrated waveguide codec is configured at a receiving end of the quantum key distribution system for time-bit-phase decoding, wherein each pulse period comprises the first time slot, the second time slot and the third time slot.
12. The time-bit-phase encoded quantum key distribution system according to claim 10, wherein the integrated waveguide codec device according to any one of claims 5 to 8 is disposed at a receiving end of the quantum key distribution system for time-bit-phase decoding, and further comprising a pre-splitter, one of two output ports of the pre-splitter being optically coupled to the integrated waveguide codec device.
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| CN210578593U (en) * | 2019-10-18 | 2020-05-19 | 中国电子科技集团公司电子科学研究院 | Integrated waveguide polarization orthogonal rotation reflection device and quantum key distribution system |
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| CN210578593U (en) * | 2019-10-18 | 2020-05-19 | 中国电子科技集团公司电子科学研究院 | Integrated waveguide polarization orthogonal rotation reflection device and quantum key distribution system |
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