CN111884025A - Local oscillator light amplification method based on continuous variable quantum key distribution of Brillouin optical fiber amplification - Google Patents

Local oscillator light amplification method based on continuous variable quantum key distribution of Brillouin optical fiber amplification Download PDF

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Publication number
CN111884025A
CN111884025A CN202010663340.8A CN202010663340A CN111884025A CN 111884025 A CN111884025 A CN 111884025A CN 202010663340 A CN202010663340 A CN 202010663340A CN 111884025 A CN111884025 A CN 111884025A
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light
local oscillator
quantum key
continuous variable
channel
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张一辰
褚斌杰
喻松
郭弘
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06754Fibre amplifiers
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35Non-linear optics
    • G02F1/39Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • G02F1/395Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves in optical waveguides

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a local oscillator light amplification method based on continuous variable quantum key distribution of Brillouin optical fiber amplification. The method comprises the steps of inputting local oscillation light and signal light output by a sending end into a channel at a channel input end by using a reverse pumping Brillouin amplifier and utilizing the polarization correlation characteristic of Brillouin amplification, inputting pumping light into the channel at a channel output end, adjusting the polarization state of the pumping light to be the same as that of the local oscillation light, and carrying out distributed Brillouin amplification on the local oscillation light through optical fiber transmission. According to the invention, the local oscillator light is amplified in the channel by using the Brillouin amplifier, so that the high-magnification distributed amplification of the local oscillator light is realized without affecting the signal light, the complexity of the system is reduced, the sensitivity of long-distance transmission of continuous variable quantum key distribution is increased, the total power consumption of the continuous variable quantum key distribution system is reduced, and the continuous variable quantum key distribution system is beneficial to being practical.

Description

Local oscillator light amplification method based on continuous variable quantum key distribution of Brillouin optical fiber amplification
Technical Field
The invention relates to the field of optical amplification, in particular to a continuous variable quantum key distribution local oscillator optical amplification technology, and especially relates to a local oscillator optical amplification method based on continuous variable quantum key distribution.
Background
Quantum key distribution is a key generation technology which is based on the basic principle of quantum mechanics and ensures unconditional safety of key distribution from the physical theory. The continuous variable quantum key distribution technology is an important component, the quantum state is encoded in a Hilbert space with infinite dimensions, and the carrier of quantum information is a regular component of a light field state. In the channel-associated local oscillator continuous variable quantum key distribution system, local oscillator light is transmitted together with a signal through a channel, the power of the local oscillator light is inevitably attenuated due to loss in the transmission process, the attenuation is larger when the distance is longer, and the long-distance continuous variable quantum key distribution system needs a strong local oscillator to amplify a weak quantum signal, so that the amplification of the local oscillator light in the continuous variable quantum key distribution system is urgently needed to be realized.
In order to efficiently amplify local oscillator light in continuous variable quantum key distribution, an efficient amplification method for distributing local oscillator light based on a continuous variable quantum key is provided. In the continuous variable quantum key distribution system, the polarization state of the local oscillator light and the polarization state of the signal light are orthogonal in a channel. Compared with other optical amplification technologies, the optical amplification technology based on the stimulated Brillouin scattering effect, which takes the optical fiber as the gain medium, has the advantages of high gain and good frequency selectivity, can realize amplification of higher gain only by pump light with lower power, has narrower gain bandwidth, does not amplify noise while amplifying signals, meets the requirement of selective amplification, and has polarization-related characteristics. By using the reverse pumping Brillouin amplifier, the same polarization state of the pumping light and the local oscillator light is kept, meanwhile, the polarization state of the pumping light is orthogonal to that of the signal light, and by using the polarization correlation characteristic of Brillouin amplification, the high-magnification distributed amplification of the local oscillator light can be realized after optical fiber transmission without affecting the signal light.
Disclosure of Invention
Technical problem to be solved
The invention provides a continuous variable quantum key distribution local oscillator light amplification method aiming at the problem of local oscillator light power amplification in continuous variable quantum key distribution, and the method is used for carrying out distributed Brillouin amplification on the continuous variable quantum key distribution local oscillator light, so that the power of the local oscillator light received by a receiving end is improved, the received signal light is not influenced, and the continuous variable quantum key distribution local oscillator light amplification is realized.
(II) technical scheme
The invention provides a continuous variable quantum key distribution-based local oscillator light amplification method, which comprises the following three steps:
step 1: selecting the polarization type, wavelength and power of pump light according to local oscillator light output by a sending end of a continuous variable quantum key distribution system;
step 2: inputting the local oscillator light and the signal light output by the sending end into a channel at a channel input end, inputting the pumping light into the channel at a channel output end, adjusting the pumping light to enable the pumping light to have the same polarization state as the local oscillator light, and performing distributed Brillouin amplification on the local oscillator light through optical fiber transmission;
and step 3: enabling the local oscillator light and the signal light to be output through a circulator at the output end of a channel, separating the local oscillator light and the signal light from the pump light by using an optical filter, and inputting the local oscillator light and the signal light to a receiving end of a continuous variable quantum key distribution system;
the steps are sequentially carried out.
The method comprises the following steps that the polarization type, the wavelength and the power of pump light are selected according to local oscillator light output by a sending end of a continuous variable quantum key distribution system, and the step 1 comprises the following steps:
step 1 a: linearly polarized light is selected as pumping light;
step 1 b: selecting pump light wavelength according to local oscillator light wavelength in the continuous variable quantum key distribution system, so that the pump light can generate larger Brillouin gain at the position of the local oscillator light wavelength;
step 1 c: and selecting the power of the pump light according to the power of the local oscillator light sent to the channel by the continuous variable quantum key distribution system and the transmission distance distributed by the continuous variable quantum key, so that the power of the local oscillator light reaching the receiving end through Brillouin amplification meets the power requirement of the receiver.
The local oscillator light and the signal light output by the sending end are input into the channel at the channel input end, the pumping light is input into the channel at the channel output end, the pumping light is adjusted to have the same polarization state as the local oscillator light, and the distributed Brillouin amplification of the local oscillator light is carried out through optical fiber transmission, wherein the step 2 comprises the following steps:
step 2 a: inputting the local oscillator light and the signal light output by the sending end into a channel through an isolator at a channel input end, and inputting pump light into the channel in a transmission direction opposite to the local oscillator light and the signal light at a channel output end by using a circulator in a reverse pumping mode;
and step 2 b: controlling the polarization state orthogonality of local oscillation light and signal light generated by a sending end of the continuous variable quantum key distribution system and keeping stable;
and step 2 c: controlling the polarization state of the pumping light to be the same as that of the local oscillation light and to be orthogonal to that of the signal light;
step 2 d: the polarization correlation of Brillouin amplification enables the pump light to amplify the local oscillator light with the same polarization direction, the signal light with the orthogonal polarization direction is not amplified, and the local oscillator light, the signal light and the pump light complete distributed Brillouin amplification of the local oscillator light through optical fiber transmission.
(III) advantageous effects
1. The invention improves the power of the local oscillator light by optically amplifying the local oscillator light in the continuous variable quantum key distribution by using the Brillouin amplifier in the channel, and the power of the local oscillator light is smaller at each point in the optical fiber by using the optical fiber as a gain medium to form distributed amplification of the local oscillator light, wherein the amplification is distributed along the optical fiber rather than centralized action, so that the interference of nonlinear effect, particularly four-wave mixing effect, can be reduced, and the influence of crosstalk between channels can be reduced.
2. The invention realizes the purpose of amplifying the local oscillator light without influencing the signal light by utilizing the characteristic that the polarization states of the local oscillator light and the signal light distributed by the continuous variable quantum key are orthogonal when the local oscillator light and the signal light are transmitted in a channel and the characteristic related to Brillouin amplification polarization, increases the sensitivity of the continuous variable quantum key distribution for long-distance transmission, eliminates the requirement of a receiving end on signal recovery of the signal light, and reduces the complexity of a system.
3. By utilizing the characteristics of high gain, narrow gain bandwidth and simple optical path adjustment of the Brillouin amplification based on the optical fiber, the invention can realize the high-magnification amplification of the local oscillator light under lower pumping power, reduce the total power consumption of the continuous variable quantum key distribution system, reduce the problems of heat dissipation and the like caused by overhigh power consumption and is beneficial to the practical application of the continuous variable quantum key distribution system.
Drawings
Fig. 1 is a diagram showing a brillouin amplification structure of the present invention.
Detailed Description
Specific embodiments of the present invention are described below with reference to the accompanying drawings:
the invention realizes the amplification of local oscillation light distributed by a continuous variable quantum key by using the Brillouin amplifier in a channel, and the method comprises the following specific steps:
1. linearly polarized light is selected as pumping light, local oscillator light with the wavelength of 1550nm used for distribution of a continuous variable quantum key and a Brillouin scattering gain spectrum of an optical fiber are selected to be shifted down by 10-11 GHz relative to the wavelength as the wavelength of the pumping light, so that the pumping light can generate large Brillouin gain at the position of the local oscillator light, and the power of the pumping light is selected according to the power of the local oscillator light and the transmission distance of the continuous variable quantum key distribution, so that the power of the local oscillator light reaching a receiving end through Brillouin amplification meets the power requirement of a receiver.
2. The method comprises the steps that local oscillator light and signal light output by a sending end are input into a channel through an isolator at a channel input end, a reverse pumping mode is adopted, pumping light is input into the channel through a circulator at a channel output end in a transmission direction opposite to that of the local oscillator light and the signal light, the polarization state orthogonality of the local oscillator light and the polarization state of the signal light generated by the sending end of a continuous variable quantum key distribution system are controlled and kept stable, the polarization state of the pumping light is controlled to be the same as that of the local oscillator light and orthogonal to that of the signal light, and the local oscillator light, the signal light and the pumping light are transmitted through optical fibers to complete distributed Brillouin amplification.
3. And outputting the local oscillation light and the signal light through the circulator at the output end of the channel, separating the local oscillation light and the signal light from the pumping light by using an optical filter, and inputting the separated local oscillation light and the signal light to a receiving end of the continuous variable quantum key distribution system.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the protective enclosure of the present invention should be defined by the appended claims.

Claims (3)

1. A local oscillator optical amplification method based on continuous variable quantum key distribution of Brillouin optical fiber amplification is characterized by comprising the following steps:
step 1: selecting the polarization type, wavelength and power of pump light according to local oscillator light output by a sending end of a continuous variable quantum key distribution system;
step 2: inputting the local oscillator light and the signal light output by the sending end into a channel at a channel input end, inputting the pumping light into the channel at a channel output end, adjusting the pumping light to enable the pumping light to have the same polarization state as the local oscillator light, and performing distributed Brillouin amplification on the local oscillator light through optical fiber transmission;
and step 3: enabling the local oscillator light and the signal light to be output through a circulator at the output end of a channel, separating the local oscillator light and the signal light from the pump light by using an optical filter, and inputting the local oscillator light and the signal light to a receiving end of a continuous variable quantum key distribution system;
the steps are sequentially carried out.
2. The method for amplifying the local oscillator light based on the distribution of the continuous variable quantum key of the brillouin optical fiber amplification according to claim 1, wherein the step 1 comprises the following steps:
step 1 a: linearly polarized light is selected as pumping light;
step 1 b: selecting pump light wavelength according to local oscillator light wavelength in the continuous variable quantum key distribution system, so that the pump light can generate larger Brillouin gain at the position of the local oscillator light wavelength;
step 1 c: and selecting the power of the pump light according to the power of the local oscillator light sent to the channel by the continuous variable quantum key distribution system and the transmission distance distributed by the continuous variable quantum key, so that the power of the local oscillator light reaching the receiving end through Brillouin amplification meets the power requirement of the receiver.
3. The method for amplifying the local oscillator light based on the brillouin optical fiber amplification continuous variable quantum key distribution according to claim 2, wherein the step 2 includes the steps of:
step 2 a: inputting the local oscillator light and the signal light output by the sending end into a channel through an isolator at a channel input end, and inputting pump light into the channel in a transmission direction opposite to the local oscillator light and the signal light at a channel output end by using a circulator in a reverse pumping mode;
and step 2 b: controlling the polarization state orthogonality of local oscillation light and signal light generated by a sending end of the continuous variable quantum key distribution system and keeping stable;
and step 2 c: controlling the polarization state of the pumping light to be the same as that of the local oscillation light and to be orthogonal to that of the signal light;
step 2 d: the polarization correlation of Brillouin amplification enables the pump light to amplify the local oscillator light with the same polarization direction, the signal light with the orthogonal polarization direction is not amplified, and the local oscillator light, the signal light and the pump light complete distributed Brillouin amplification of the local oscillator light through optical fiber transmission.
CN202010663340.8A 2020-07-10 2020-07-10 Local oscillator light amplification method based on continuous variable quantum key distribution of Brillouin optical fiber amplification Pending CN111884025A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103490272A (en) * 2013-09-11 2014-01-01 上海交通大学 2um single frequency pulse fiber laser adjustable in amplitude modulation frequency
CN106789034A (en) * 2017-01-18 2017-05-31 北京邮电大学 A kind of continuous variable quantum key distribution system method of data synchronization based on local oscillator light
CN109756330A (en) * 2019-01-24 2019-05-14 北京邮电大学 A kind of local oscillator method of light amplification of the continuous variable quantum key distribution based on Raman fiber amplification
CN110445009A (en) * 2019-07-29 2019-11-12 北京邮电大学 Optical fiber Brillouin amplifier based on orthogonal double pumping action

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103490272A (en) * 2013-09-11 2014-01-01 上海交通大学 2um single frequency pulse fiber laser adjustable in amplitude modulation frequency
CN106789034A (en) * 2017-01-18 2017-05-31 北京邮电大学 A kind of continuous variable quantum key distribution system method of data synchronization based on local oscillator light
CN109756330A (en) * 2019-01-24 2019-05-14 北京邮电大学 A kind of local oscillator method of light amplification of the continuous variable quantum key distribution based on Raman fiber amplification
CN110445009A (en) * 2019-07-29 2019-11-12 北京邮电大学 Optical fiber Brillouin amplifier based on orthogonal double pumping action

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
苗新 主编: "《光纤通信技术》", 28 February 2002 *
袁建国 编著: "《光波技术基础》", 31 October 2017 *

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Application publication date: 20201103