WO2002021196A1 - Optical signal transmitter and optical signal transmitting method - Google Patents
Optical signal transmitter and optical signal transmitting method Download PDFInfo
- Publication number
- WO2002021196A1 WO2002021196A1 PCT/JP2001/007698 JP0107698W WO0221196A1 WO 2002021196 A1 WO2002021196 A1 WO 2002021196A1 JP 0107698 W JP0107698 W JP 0107698W WO 0221196 A1 WO0221196 A1 WO 0221196A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- polarization
- optical signal
- path
- optical path
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
-
- 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
Definitions
- the present invention relates to, for example, a transmission device in a Faraday mirror type quantum cryptography device.
- Figure 7 shows, for example, G. R ibordy, et.a 1.
- Quantum CRYP TOGRAPHY DEVICE AND METHOD the quantum cryptography transmission device 100 includes a power plug 1 connected to the communication optical fiber 110, and an optical pulse input from the communication optical fiber 110 to the power blur 1.
- Photodetector 2 which detects the light source
- polarization controller 3 which adjusts the polarization mode of the input light pulse, attenuates the intensity of the light pulse, and changes the intensity of the light pulse output from the quantum cryptographic device to the quantum level (per pulse).
- Attenuator 4 which turns the photons into 0.1), reflects the input pulse by rotating its plane of polarization by 90 degrees, thus TE polarization Input pulse is reflected as a TM-polarized optical pulse, and the TM-polarized input pulse is reflected as a TE-polarized optical pulse.
- Frearaday mirror 7 and phase modulator 8 that applies phase modulation to the passing pulse.
- a control board 9 which controls the polarization mode of the input light pulse, attenuates the intensity of the light pulse, and changes the intensity of the light pulse output from the quantum cryptographic device to the quantum level (per pulse).
- Attenuator 4 which turns the photons into 0.1), reflects the input pulse by rotating its plane of polarization by
- TE polarization (TRANSV ER SEE LECTR IC POLAR I ZAT I ON WAVE) is a light wave in which the direction of vibration of the electric vector is perpendicular to the plane of incidence and the direction of vibration of the magnetic vector is within the plane of incidence.
- TM polarization (TRANS VER SE MAGNET IC POLAR I ZAT I ON WAVE
- the quantum cryptography receiver 200 includes a power blur 51, a photon detector 52, a photon detector 53, a polarization controller 54, a polarization controller 55, a polarization beam splitter 56, a circular modulator 57, and a phase modulator 58. , A control plate 59, a laser 60, a short optical path 61, and a long optical path 62.
- the quantum cryptography receiver 200 of FIG. 7 generates an optical pulse P by the laser 60.
- the optical pulse P is split by the coupler 51 into a short optical path 61 and a long optical path 62.
- the polarization of the light pulse in the long optical path 62 is adjusted by the polarization controller 55, passed through the phase modulator 58, and output to the communication optical fiber 110 by the polarization beam splitter 56.
- the optical pulse on the short optical path 61 is also output to the communication optical fiber 110. Since the long optical path 62 has a longer path than the short optical path 61, two different pulses P1 and P2 are output to the communication optical fiber 110. Thus, the optical pulses P 1 and P 2 having two different polarization modes are output to the communication optical fiber 110.
- Light pulses P1 and P2 having two different polarization modes are input to the quantum cryptographic transmission device 100 at different timings through the communication optical fiber 110.
- the optical pulses P 1 and P 2 input via the communication optical fiber 110 are each split into two by the coupler 1, and one of the optical pulses P 1 and P 2 split by the coupler 1 is an optical pulse. Detected by detector 2. According to the optical pulse detection timing of the optical detector 2, the phase modulator 8 Modulation is applied only to the light pulse P2 of 1, P2.
- the other optical pulses P 1 and P 2 split by the coupler 1 are adjusted in polarization plane by the polarization controller 3 so that the phase modulator 8 operates optimally.
- the first optical pulse P1 of the two optical pulses P1 and P2 input to the quantum cryptography transmitter 100 is shifted at a shifted timing so that it is in the TE polarization mode. Is done. Therefore, the second light pulse P 2 is in the TM polarization mode.
- An optical pulse that passes through the polarization controller 3 and the attenuator 4 and travels to the Faraday mirror 7 passes through the phase modulator 8 and is input to the Faraday mirror 7.
- the optical pulse input to the Faraday mirror 7 is such that an optical pulse having a polarization mode of TE polarization is reflected as a TM-polarized optical pulse, and a TM-polarized optical pulse is reflected as a TE-polarized optical pulse. It is reflected.
- the reflected light pulse passes through the phase modulator 8 again.
- the phase modulator 8 is controlled to apply phase modulation only to the second optical path ⁇ 2 of the two optical paths ⁇ 1 and ⁇ 2 reflected by the Faraday mirror 7 and passing through the phase modulator 8.
- the timing is adjusted by plate 9.
- the optical pulse # 2 that has been subjected to the phase modulation is transmitted so as to reverse the optical path that has entered the communication optical fiber 110.
- the two light pulses ⁇ 1 and ⁇ 2 that have passed through the phase modulator 8 after being reflected by the Faraday mirror 7 are directed to the attenuator 4.
- the attenuator 4 reduces the intensity of the optical pulse until the intensity of the optical pulse that has been phase-modulated by the phase modulator 8 reaches a quantum level (0.1 photons per pulse). Thereafter, the optical pulse passes through the polarization controller 3 and the power blur 1 in this order, and is transmitted to the communication optical fiber 110.
- L 4 shown in FIG. 8 represents a loss in intensity of each optical pulse when the optical pulses P 1 and P 2 pass through the attenuator 4, and L 8 represents each loss when passing through the phase modulator 8. Represents the loss of light pulse intensity. Further, in FIG. 8, the loss that the optical pulses P 1 and P 2 receive when passing through each part is indicated by an arrow L.
- the intensity of an optical pulse input from the communication optical fiber 110 is S
- the TE polarization loss of the phase modulator 8 is L 8 (TE)
- the TM polarization loss of the phase modulator 8 is L 8 (TM)
- other losses are LZ, and the following values are assumed.
- L Assuming that the total light intensity loss is L, L can be obtained by the following equation.
- An optical signal transmitting apparatus receives an optical signal, forms an optical path of the optical signal, and transmits a first optical path for transmitting the optical signal;
- First and second polarization beam splitters provided in the first optical path, for separating an optical signal from the first optical path;
- the optical signal transmitting device further comprises:
- the first optical path is used as a forward path and a return path of an optical signal
- the second optical path is used as a forward path and a return path of an optical signal separated by the first and second polarization beam splitters.
- the first optical path receives an optical signal having a TE-polarized optical pulse and a TM-polarized optical pulse,
- the first and second polarization beam splitters separate the TE-polarized light pulses.
- the phase modulator is characterized in that it applies phase modulation to an optical pulse of TE polarization.
- An optical signal transmission method according to the present invention comprises:
- the optical signal transmitting method includes a forward path and a return path for reciprocating the optical path by reflecting the optical signal,
- the phase modulation step is performed in the return path step.
- An optical signal transmitting apparatus receives an optical signal, forms an optical path of the optical signal, and transmits and receives an optical signal.
- a polarizing beam splitter provided at an end of the transmission / reception optical path and separating an optical signal from the transmission / reception optical path;
- Both ends are connected to the polarizing beam splitter, and a loop optical path serving as an optical path for recirculating the optical signal separated by the polarizing beam splitter to the polarizing beam splitter;
- a phase modulator provided in the loop optical path to apply phase modulation to the optical signal; and a polarization mode converter provided in the loop optical path to change the polarization mode of the optical signal.
- the polarization mode changer has a first 'slow force bra that changes the polarization mode by connecting the first axis and the slow axis of the polarization axis of the optical fiber,
- the transmission and reception optical paths are used as the outward path and the return path of the optical signal
- the loop optical path is characterized in that it is used as a forward path and a return path of the optical signal split by the polarization beam splitter. Further, the transmission / reception optical path receives an optical signal having a TE-polarized optical pulse and a TM-polarized optical pulse, and the polarization beam splitter separates the TE-polarized optical pulse and the TM-polarized optical pulse. The phase modulator applies phase modulation to the TE-polarized light pulse.
- An optical signal transmitting method is characterized in that a TE polarization and a TM polarization are separated from an optical signal flowing through a transmission / reception optical path and having a TE polarization and a TM polarization and output to one end and the other end of the loop optical path.
- the above optical signal transmission method includes: a forward path step of reciprocating an optical signal in a transmission / reception optical path; a return path step; and a recirculation step of flowing the optical signal through a loop optical path.
- the phase modulation step is performed in a reflux step.
- FIG. 1 is an optical system configuration diagram of a Faraday mirror type quantum cryptography transmission device according to a preferred embodiment of the present invention.
- -FIG. 2 is an operation flowchart of FIG.
- FIG. 3 is a diagram showing a state of a light pulse.
- FIG. 4 is a diagram showing a time-series passing state of an optical pulse.
- FIG. 5 is an optical system configuration diagram according to the second embodiment.
- FIG. 6 is a configuration diagram of an optical system according to the second embodiment.
- FIG. 7 is an overall configuration diagram of a conventional Faraday mirror type quantum cryptography device.
- FIG. 8 is a state diagram of light pulses of a conventional Faraday mirror type quantum cryptography transmission device.
- FIG. 9 is a configuration diagram of an optical system according to the third embodiment.
- FIG. 10 is an operation flowchart of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is an optical system configuration diagram showing a quantum cryptography transmission device 100 in a Faraday mirror type quantum cryptography device.
- the Faraday one-mirror type quantum cryptography transmission device uses two polarization beam splitters to make the forward and return paths of the optical path in the transmission device different.
- a quantum cryptography transmission device 100 is a power detector 1 connected to a communication optical fiber 110, and an optical detection device for detecting an optical pulse input from the communication optical fiber 110 to the power fiber 1.
- Device 2 a polarization controller 3 for adjusting the polarization mode of the input light pulse, attenuating the intensity of the light pulse, and changing the intensity of the light pulse output from the quantum encryption device to a quantum level (0.1 photons per pulse).
- the attenuator 4 makes the light pulse according to its polarization mode, and the TE-polarized light pulse is automatically sent to the modulation light path 13 through the phase modulator 8 and to the bypass light path 11 to bypass the TM-polarized light pulse.
- the optical path connecting the attenuator 4, the polarization beam splitter 5, the polarization beam splitter 6, and the Faraday mirror 7 is the first optical path R1.
- An optical path connecting the polarization beam splitter 5, the phase modulator 8, and the polarization beam splitter 6 is a second optical path R2.
- the second optical path R2 is arranged in parallel with the first optical path R1.
- the phase modulator 8 is arranged on the second optical path R2.
- Other configurations are the same as in FIG.
- FIG. 2 is an operation flowchart of the quantum signal transmitter 100.
- FIG. 3 is a state diagram of each part of the light pulse.
- FIG. 4 is a diagram showing a time-series passing state of optical pulses in the bypass optical path 11 and the modulation optical path 13.
- P, P 1 and P 2 indicate pulses.
- the arrows of L 4, L 5, L 6, and L 8 at the top of each pulse indicate the attenuator 4, polarization beam splitter 5, polarization beam splitter 6, and phase modulator 8, respectively. This indicates that there is a loss of light intensity due to
- optical pulses P 1 and P 2 having two different polarization modes are input to the quantum cryptography transmission device 100 of FIG. 1 at different timings through a communication optical fiber 110.
- the optical pulses P 1 and P 2 input via the communication optical fiber 110 are each split into two by the coupler 1, and one of the optical pulses P 1 and P 2 split by the coupler 1 is a photodetector Detected by 2.
- the phase modulator 8 modulates only the light pulse P2 of the light pulses P1 and P2 according to the light pulse detection timing of the light detector 2.
- the other optical pulses P 1 and P 2 split by the coupler 1 are adjusted in polarization plane by the polarization controller 3 so that the phase modulator 8 operates optimally (S 2).
- the first optical pulse P 1 out of the two optical pulses P 1 and P 2 input to the quantum cryptography transmission device 100 with the timing shifted is adjusted so as to be in the TE polarization mode. You. Therefore, the second light pulse is in the TM polarization mode.
- the intensity of the light pulse is weakened by the attenuator 4 (S3).
- An optical pulse passing through the polarization controller 3 and traveling toward the Faraday mirror 7 is output from the polarization beam splitter 5, and an optical pulse P 1 having a polarization mode of TE polarization passes through the modulation optical path 13 passing through the phase modulator 8.
- the TM-polarized light pulse P2 is selected as the bypass optical path 11 directly to the polarization beam splitter 6 (S4).
- the two light pulses P 1 and P 2 having passed through different optical paths are both merged by the polarization beam splitter 6 and input to the Faraday mirror 7 (S5).
- the optical pulse input to the Faraday mirror 7 is reflected as a TM-polarized optical pulse P 1 for a TE-polarized optical pulse, and a TE-polarized optical pulse for a TE-polarized optical pulse P 2. It is reflected (S6).
- the two light pulses P1 and P2 that have passed through such different optical paths are combined by the polarizing beam splitter 5 and travel to the attenuator 4 (S9).
- the attenuator 4 attenuates the intensity of the optical pulse until the intensity of the optical pulse subjected to the phase modulation by the phase modulator 8 reaches a quantum level (0.1 photons per pulse) (S10). Thereafter, the optical pulse passes through the polarization controller 3 and the coupler 1 in this order, and is transmitted to the communication optical fiber 110 (S11).
- the optical pulse passing through the bypass optical path 11 which is a part of the first optical path R1 is only the optical pulse of the TM polarization.
- optical pulses passing through the modulated optical path 13 of the second optical path R2 are only TE polarized optical pulses.
- the order in which these light pulses pass is the order of arrows A1, A2, and A3 in FIG. Arrows A4, A5, and A6 are arranged in this order.
- the intensity of the optical pulse input from the communication optical fiber 110 is S
- the intensity loss of the optical pulse by the polarization beam splitter 5 is L 5
- the intensity loss of the optical pulse by the polarization beam splitter 6 is L 6.
- the loss of the intensity of the optical pulse due to the phase modulator 8 is L8, and the other loss is LZ, and the following values are taken.
- the other loss LZ includes the loss L4 of the intensity of the optical pulse due to the attenuator 4 in FIG. Also, in FIG. 4, the loss incurred when the light pulses Pl and P2 pass through each part is indicated by the arrow L.
- L Assuming that the total light intensity loss is L, L can be obtained by the following equation.
- the optical pulse incident on the transmitting device includes two optical pulses of the TE polarization and the TM polarization with respect to the phase modulator 8.
- This optical pulse is reflected by the Faraday mirror 7 in which the TE polarization is converted into the TM polarization and the TM polarization is rotated into the TE polarization by rotating the polarization plane and output from the transmission device.
- a single optical pulse passes through the phase modulator 8 in two states of TE polarization and TM polarization.
- the phase modulator 8 has a low transmittance with respect to the TM polarization, and in the conventional configuration, the incident pulse is output with a reduction of, for example, 40 dB.
- the polarization beam splitter 5 Using two polarization beam splitters 6, the TM-polarized light pulse bypasses the phase modulator 8. Only the TE polarized light pulse is passed through the phase modulator 8. Thus, the reduction of the incident pulse is suppressed to 30 dB, and an improvement of 10 dB in S / N ratio is achieved.
- the optical path in the quantum cryptography transmitter is provided separately for the forward path and the return path by using the two polarization beam splitters 5 and 6, and the phase modulation is performed on one of the optical paths.
- the Faraday-mirror type quantum cryptography transmission device characterized by installing the device 8 has been described.
- the optical pulse passing through the quantum cryptographic transmitter is separated into the forward path and the return path by the two polarization beam splitters 5 and 6, and passes through the phase modulator 8 only once and the TE polarization Since the light passes only in the polarization mode of the wave, the loss of the incident pulse due to the quantum cryptography transmitter 100 becomes 30 dB when the attenuator 4 is removed, which is equivalent to the loss of the prior art quantum cryptography transmitter 100.
- an improvement of 10 dB has been achieved. Therefore, at the time of adjustment, an improvement of 10 dB in terms of the S / N ratio is achieved, and adjustment of the quantum cryptographic device can be realized more easily.
- Embodiment 2 Embodiment 2
- the polarization beam splitter 5 and the polarization beam splitter 6 that reflect the TE polarization and pass the TM polarization are used, but as shown in FIG. It is useless to use a polarizing beam splitter 5a that reflects light and a polarizing beam splitter 6a that passes TE polarized light.
- a polarization beam splitter 5 that passes through the TM polarization and a polarization beam splitter 6a that passes through the TE polarization may be used.
- a polarization beam splitter 6 that passes through the TE polarization and a polarization beam splitter 6 that passes through the TM polarization may be used.
- the Faraday mirror 7 is used, but other than the Faraday mirror 7 may be used as long as it has the same function as the Faraday mirror 7.
- Embodiment 3 is used, but other than the Faraday mirror 7 may be used as long as it has the same function as the Faraday mirror 7.
- FIG. 9 is a diagram showing a configuration in which the Faraday mirror 7 is not used.
- the transmission device includes a transmission / reception optical path R3 and a loop optical path R4.
- a polarization controller 3, an attenuator 4, and a polarization beam splitter 5 are provided in the transmission / reception optical path R3.
- the polarization beam splitter 5 has three ports A, B, and C.
- the A port connects the transmission / reception optical path R3.
- the B port connects one end of the loop optical path R4.
- the C port connects the other end of the loop optical path R4. With this configuration, the optical signal output from the B port is input to the C port.
- the optical signal output from port C is input to port B.
- Such looping of an optical signal between the B port and the C port using the loop optical path R4 is hereinafter referred to as reflux.
- a phase modulator 8 and a fast 'slow coupler 70 are provided in the loop optical path R4.
- the first 'slow coupler 70 changes the TM polarization to the TE polarization by connecting the fast axis and the slow axis of the polarization axis of the optical fiber, and changes the TE polarization to the TM polarization. is there.
- the first slow power bra 70 is an example of a polarization mode changer.
- the polarization beam splitter 5 is used to separate the TM polarized light pulse and the TE polarized light pulse, and the TE polarized light pulse is passed directly to the phase modulator 8.
- the T M polarized light pulse passes through the first port of the phase modulator 8 via the first 'slow coupler 70.
- FIG. 10 is an operation flowchart of the quantum cryptography transmitting apparatus 100 shown in FIG.
- the TE-polarized light pulse separated by the polarization beam splitter 5 is input to the phase modulator 8, and undergoes phase modulation (S8).
- the TE-polarized optical pulse subjected to the phase modulation is input to the first ⁇ slow coupler 70, the polarization mode is changed (S12), and output as a TM-polarized optical pulse. .
- the TM-polarized light pulse separated by the polarization beam splitter 5 is input to the first-slow coupler 70, changed from TM-polarized light to TE-polarized light (S12), and output.
- the TE-polarized light pulse output from the first 'slow coupler 70 is input to the phase modulator 8, but is not subjected to phase modulation and is output to the polarization beam splitter 5 as it is.
- the above-described forward path step S40 and return path step S60 are operations performed in the transmission / reception optical path R3.
- the recirculation step S50 described above is an operation performed in the loop optical path R4.
- the TE-polarized optical pulse output from the B port passes through the phase modulator 8 only once and is returned to the C port.
- first 'slow force bra 70 is an example of a polarization mode changer, and if it is possible to change between the TM polarization and the TE polarization, other devices may be used. I do not care. For example, 1/2 plate ( ⁇ is wavelength) May be used. Alternatively, the optical communication cable may be twisted 90 degrees. Alternatively, the optical communication cables may be connected 90 degrees orthogonally. Industrial applicability
- the optical path in the apparatus is separated for the forward path and the return path, and the light pulse passing therethrough is transmitted to the phase modulator 8.
- the strength loss can be reduced, and the S / N ratio at the time of adjusting the quantum cryptography transmitter can be increased, and the adjustment is facilitated.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Computer Security & Cryptography (AREA)
- Theoretical Computer Science (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001284435A AU2001284435B2 (en) | 2000-09-07 | 2001-09-05 | Optical signal transmitter and optical signal transmitting method |
KR1020037003348A KR100567691B1 (ko) | 2000-09-07 | 2001-09-05 | 광 신호 송신 장치 및 광 신호 송신 방법 |
CA002420447A CA2420447A1 (en) | 2000-09-07 | 2001-09-05 | Optical signal transmitter and optical signal transmitting method |
AU8443501A AU8443501A (en) | 2000-09-07 | 2001-09-05 | Optical signal transmitter and optical signal transmitting method |
US10/363,817 US20040005056A1 (en) | 2000-09-07 | 2001-09-05 | Optical signal transmitter and optical signal transmitting method |
EP01963439A EP1324101A4 (en) | 2000-09-07 | 2001-09-05 | OPTICAL SIGNAL TRANSMITTER AND METHOD FOR TRANSMITTING OPTICAL SIGNALS |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000272037 | 2000-09-07 | ||
JP2000-272037 | 2000-09-07 | ||
JP2001-218096 | 2001-07-18 | ||
JP2001218096A JP4060551B2 (ja) | 2000-09-07 | 2001-07-18 | 光信号送信装置及び光信号送信方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002021196A1 true WO2002021196A1 (en) | 2002-03-14 |
Family
ID=26599459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/007698 WO2002021196A1 (en) | 2000-09-07 | 2001-09-05 | Optical signal transmitter and optical signal transmitting method |
Country Status (9)
Country | Link |
---|---|
US (1) | US20040005056A1 (ja) |
EP (1) | EP1324101A4 (ja) |
JP (1) | JP4060551B2 (ja) |
KR (1) | KR100567691B1 (ja) |
CN (1) | CN1237368C (ja) |
AU (2) | AU8443501A (ja) |
CA (1) | CA2420447A1 (ja) |
TW (1) | TW571143B (ja) |
WO (1) | WO2002021196A1 (ja) |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7324647B1 (en) | 2000-10-23 | 2008-01-29 | Bbn Technologies Corp. | Quantum cryptographic key distribution networks with untrusted switches |
JP4619578B2 (ja) * | 2001-07-25 | 2011-01-26 | 三菱電機株式会社 | 信号状態制御装置及び信号状態制御方法 |
US7457416B1 (en) | 2002-07-17 | 2008-11-25 | Bbn Technologies Corp. | Key distribution center for quantum cryptographic key distribution networks |
US7460670B1 (en) | 2002-12-20 | 2008-12-02 | Bbn Technologies Corp. | Systems and methods for managing quantum cryptographic networks |
US7236597B2 (en) | 2002-12-20 | 2007-06-26 | Bbn Technologies Corp. | Key transport in quantum cryptographic networks |
US7706535B1 (en) | 2003-03-21 | 2010-04-27 | Bbn Technologies Corp. | Systems and methods for implementing routing protocols and algorithms for quantum cryptographic key transport |
US7430295B1 (en) | 2003-03-21 | 2008-09-30 | Bbn Technologies Corp. | Simple untrusted network for quantum cryptography |
JP4632652B2 (ja) * | 2003-10-10 | 2011-02-16 | 日本電気株式会社 | 量子暗号鍵配布システム及びそれに用いる同期方法 |
EP1687921A4 (en) * | 2003-11-12 | 2008-03-12 | Magiq Technologies Inc | DETECTOR AUTOCALIBRATION IN QKD SYSTEMS |
JP5142095B2 (ja) * | 2003-11-28 | 2013-02-13 | 独立行政法人科学技術振興機構 | 通信システム及びそれを用いた通信方法 |
CN1651947A (zh) | 2004-02-02 | 2005-08-10 | 中国科学技术大学 | 一种偏振控制编码方法、编码器和量子密钥分配系统 |
US7515716B1 (en) | 2004-02-26 | 2009-04-07 | Bbn Technologies Corp. | Systems and methods for reserving cryptographic key material |
US7697693B1 (en) | 2004-03-09 | 2010-04-13 | Bbn Technologies Corp. | Quantum cryptography with multi-party randomness |
KR100687752B1 (ko) | 2005-10-14 | 2007-02-27 | 한국전자통신연구원 | 광학적 클럭 신호 추출 방법 및 장치 |
KR100759811B1 (ko) * | 2005-12-08 | 2007-09-20 | 한국전자통신연구원 | 고속 자동 보상 양자 암호 송수신장치 및 방법 |
KR100890389B1 (ko) | 2006-12-05 | 2009-03-26 | 한국전자통신연구원 | 편광 무의존 단방향 양자 암호 수신 및 송수신 장치 |
JP5182049B2 (ja) * | 2008-12-09 | 2013-04-10 | 富士通株式会社 | 偏波変換デバイス及び偏波多重変調器 |
US20100284054A1 (en) * | 2009-05-08 | 2010-11-11 | Honeywell International Inc. | Modulation of unpolarized light |
US12007605B2 (en) | 2011-06-08 | 2024-06-11 | Skorpios Technologies, Inc. | Monolithically-integrated, polarization-independent circulator |
US9453965B2 (en) * | 2011-06-08 | 2016-09-27 | Skorpios Technologies, Inc. | Systems and methods for photonic polarization rotators |
KR101610747B1 (ko) | 2014-08-19 | 2016-04-08 | 한국과학기술연구원 | 양자 암호 통신 장치 및 방법 |
US20160337041A1 (en) * | 2015-05-15 | 2016-11-17 | Futurewei Technologies, Inc. | Polarization Independent Reflective Modulator |
WO2018017958A2 (en) | 2016-07-22 | 2018-01-25 | Skorpios Technologies, Inc. | Monolithically-integrated, polarization-independent circulator |
CN107872314B (zh) | 2016-09-27 | 2020-06-26 | 华为技术有限公司 | 编码装置、光反射器及基于其的量子密钥分发设备及系统 |
US10551640B2 (en) | 2016-11-21 | 2020-02-04 | Futurewei Technologies, Inc. | Wavelength division multiplexed polarization independent reflective modulators |
US10222676B2 (en) | 2017-01-27 | 2019-03-05 | Futurewei Technologies, Inc. | Polarization insensitive integrated optical modulator |
US10330959B2 (en) | 2017-05-22 | 2019-06-25 | Futurewei Technologies, Inc. | Polarization insensitive micro ring modulator |
US10243684B2 (en) | 2017-05-23 | 2019-03-26 | Futurewei Technologies, Inc. | Wavelength-division multiplexed polarization-insensitive transmissive modulator |
CN110149153B (zh) * | 2018-02-13 | 2020-12-01 | 华为技术有限公司 | 光调制器、调制方法及光调制系统 |
GB2571521B (en) * | 2018-02-22 | 2021-07-07 | Toshiba Kk | A transmitter for a quantum communication system, a quantum communication system and a method of generating intensity modulated Photon pulses |
EP4351043A1 (en) * | 2022-10-05 | 2024-04-10 | Fundació Institut de Ciències Fotòniques | Optical system for phase modulation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05289124A (ja) * | 1992-04-06 | 1993-11-05 | Nippon Telegr & Teleph Corp <Ntt> | 偏波無依存型光パルス分離回路 |
JPH09247086A (ja) * | 1996-03-08 | 1997-09-19 | Nippon Telegr & Teleph Corp <Ntt> | 量子暗号の構成方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5511086A (en) * | 1995-03-22 | 1996-04-23 | The Texas A&M University System | Low noise and narrow linewidth external cavity semiconductor laser for coherent frequency and time domain reflectometry |
US6188768B1 (en) * | 1998-03-31 | 2001-02-13 | International Business Machines Corporation | Autocompensating quantum cryptographic key distribution system based on polarization splitting of light |
AU2748101A (en) * | 1999-10-27 | 2001-06-06 | California Institute Of Technology | Opto-electronic devices for processing and transmitting rf signals based on brillouin selective sideband amplification |
-
2001
- 2001-07-18 JP JP2001218096A patent/JP4060551B2/ja not_active Expired - Fee Related
- 2001-09-04 TW TW090121868A patent/TW571143B/zh not_active IP Right Cessation
- 2001-09-05 US US10/363,817 patent/US20040005056A1/en not_active Abandoned
- 2001-09-05 CA CA002420447A patent/CA2420447A1/en not_active Abandoned
- 2001-09-05 AU AU8443501A patent/AU8443501A/xx active Pending
- 2001-09-05 EP EP01963439A patent/EP1324101A4/en not_active Withdrawn
- 2001-09-05 WO PCT/JP2001/007698 patent/WO2002021196A1/ja not_active Application Discontinuation
- 2001-09-05 AU AU2001284435A patent/AU2001284435B2/en not_active Ceased
- 2001-09-05 CN CNB018152791A patent/CN1237368C/zh not_active Expired - Fee Related
- 2001-09-05 KR KR1020037003348A patent/KR100567691B1/ko not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05289124A (ja) * | 1992-04-06 | 1993-11-05 | Nippon Telegr & Teleph Corp <Ntt> | 偏波無依存型光パルス分離回路 |
JPH09247086A (ja) * | 1996-03-08 | 1997-09-19 | Nippon Telegr & Teleph Corp <Ntt> | 量子暗号の構成方法 |
Non-Patent Citations (2)
Title |
---|
H. ZBINDEN ET AL.: "Quant um cryptography", APPLIED PHYSICS B, vol. 67, 1998, pages 743 - 748, XP002949593 * |
See also references of EP1324101A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP4060551B2 (ja) | 2008-03-12 |
AU2001284435B2 (en) | 2004-09-23 |
EP1324101A4 (en) | 2007-11-14 |
EP1324101A1 (en) | 2003-07-02 |
KR100567691B1 (ko) | 2006-04-05 |
CA2420447A1 (en) | 2003-02-25 |
JP2002156615A (ja) | 2002-05-31 |
CN1452727A (zh) | 2003-10-29 |
AU8443501A (en) | 2002-03-22 |
KR20030032012A (ko) | 2003-04-23 |
TW571143B (en) | 2004-01-11 |
US20040005056A1 (en) | 2004-01-08 |
CN1237368C (zh) | 2006-01-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2002021196A1 (en) | Optical signal transmitter and optical signal transmitting method | |
US7457548B2 (en) | Quantum optical transmission device and quantum optical generator device therefor | |
US10222822B2 (en) | Photonic quantum memory with polarization-to-time entanglement conversion and time-to-polarization entanglement conversion | |
US9030731B2 (en) | Quantum entangled photon pair generator | |
WO2019080530A1 (zh) | 一种相位解码方法、装置和量子密钥分发系统 | |
WO2005076517A1 (en) | A polarisation-controlled encoding method, encoder and quantum key distribution system | |
WO2005112335A1 (ja) | 量子暗号通信装置 | |
WO2021128557A1 (zh) | 量子通信光路系统和量子通信方法 | |
US9488847B2 (en) | Variable optical attenuator | |
JP4138307B2 (ja) | 光信号を再生成する方法 | |
US8314988B2 (en) | Polarization insensitive optical circuit | |
US8452185B2 (en) | Polarization insensitive optical circuit | |
JP4388316B2 (ja) | 量子暗号通信装置および方法 | |
CN217590831U (zh) | 一种基于时间相位编码的qkd系统 | |
JP4500074B2 (ja) | 偏波無依存型光学機器 | |
US6188810B1 (en) | Reversible ring coupler for optical networks | |
KR101987739B1 (ko) | 단일모드 광섬유 기반 벨 상태 측정장치 | |
WO2023207573A1 (zh) | 一种小型化的时间相位解码器及qkd接收方 | |
US20230280531A1 (en) | Integrated polarization controller systems | |
JP2827501B2 (ja) | 光セルフ・ルーテイング回路 | |
JP2008109666A (ja) | 自由空間光通信に基づく全光信号識別再生のためのシステムおよび方法 | |
JP2004361697A (ja) | 光パルス列変換装置 | |
JPH01243599A (ja) | 半導体レーザモジュール | |
JPH07107586B2 (ja) | 偏波面制御装置 | |
JPH0879182A (ja) | 光通信装置及び光ネットワーク |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU CA CN KR MX NO SG US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2420447 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2001284435 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2001963439 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020037003348 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10363817 Country of ref document: US Ref document number: 018152791 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 1020037003348 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2001963439 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2001284435 Country of ref document: AU |
|
WWR | Wipo information: refused in national office |
Ref document number: 1020037003348 Country of ref document: KR |