阅读说明：本技术 相干光通信的物理层安全通信装置及其方法 (Physical layer safety communication device and method for coherent light communication ) 是由 陈寅芳 齐艺超 金亚 陈伟 李明 祝宁华 于 2021-06-22 设计创作，主要内容包括：本公开提供一种相干光通信的物理层安全通信装置,包括：发送端,能够在用户信息中填充冗余数据,形成填充数据；并通过对相干光进行携带所述填充数据的调制,形成数据相干光并输出；接收端,能够接收所述数据相干光,通过对所述数据相干光进行处理得到所述填充数据；并通过对处理得到所述填充数据进行恢复,得到所述用户信息。本公开还提供了一种相干光通信的物理层安全通信方法。实现物理层安全具备无需密钥管控分发、无需复杂计算和直接面向底层数据；实现了低时延、低功耗特点,正在被应用到越来越多的高速率安全场景。(The present disclosure provides a physical layer secure communication apparatus of coherent optical communication, including: the sending end can fill redundant data in the user information to form filling data; modulating the coherent light carrying the filling data to form data coherent light and outputting the data coherent light; the receiving end can receive the data coherent light and process the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information. The present disclosure also provides a physical layer secure communication method of coherent optical communication. The physical layer security is realized without key management and control distribution, without complex calculation and directly facing to bottom layer data; the method realizes the characteristics of low time delay and low power consumption, and is being applied to more and more high-speed security scenes.)

1. A physical layer secure communications apparatus for coherent optical communications, comprising:

the sending end can fill redundant data in the user information to form filling data; modulating the coherent light carrying the filling data to form data coherent light and outputting the data coherent light;

the receiving end can receive the data coherent light and process the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information.

2. The physical layer secure communication apparatus of claim 1, wherein the transmitting end comprises:

a light source for outputting the coherent light;

the sending control platform is used for receiving the user information and filling the redundant data between the user information bits to form filling data; and can distribute the padding data to two branches for output in the form of single bit or multiple bits;

and the modulator is used for receiving the coherent light and the filling data, and modulating the coherent light through the electric signals of the two branches to obtain the data coherent light.

3. The physical layer secure communication apparatus of claim 2, wherein the receiving end comprises:

the coherent receiver is used for receiving the data coherent light and processing the data coherent light to obtain two paths of electric signals which are the same as the two branches;

and the receiving control platform is used for receiving the two paths of electric signals sent by the coherent receiver and recovering data of the two paths of electric signals sent by the coherent receiver.

4. The physical layer secure communications apparatus of claim 2, wherein the light source is a coherent light source of narrow linewidth continuous light having linewidth typical values less than 100 kHz.

5. The physical layer secure communications device of claim 2, wherein the modulator is a mach-zehnder modulator having a modulation format of one of BPSK, QPSK, and 16 QAM.

6. The physical layer secure communications apparatus of claim 3, wherein the coherent optical receiver processes the data coherent light to heterodyne coherent demodulation of the received data coherent light.

7. The physical layer secure communications apparatus of claim 3, wherein the transmit control platform and the receive control platform are implemented based on FPGAs.

8. The physical layer secure communications apparatus of claim 7, wherein the FPGA is capable of sending the user information recovered by a receiving end to a target user.

9. The physical layer secure communications apparatus of claim 1, wherein the transmission channel between the transmitting end and the receiving end is an optical fiber forming a fiber channel.

10. The physical layer secure communication method of coherent optical communication of the physical layer secure communication apparatus according to any one of claims 1 to 9, comprising:

filling redundant data in the user information to form filling data; and the coherent light is modulated to carry the filling data to form data coherent light;

processing the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information.

Technical Field

The present disclosure relates to the field of coherent optical communication technologies, and in particular, to a physical layer secure communication apparatus and method for coherent optical communication.

Background

In recent years, with the rise of new services such as high-quality videos, social networks, cloud storage, data centers and the like and the continuous push of high-speed high-capacity access networks, the demand of people for bandwidth continues to increase rapidly. The coherent optical communication technology is considered to be a development trend of the future optical communication technology because it can carry large-capacity and long-distance data transmission. Meanwhile, with the increase of the data transmission amount of coherent optical communication and the current situation that optical fibers are basically not protected physically, people have more and more concerns about the safety of optical communication data. The traditional algorithm based on complex calculation amount is safe and limited by key length, key management, calculation complexity and the like, and the application of the traditional algorithm in a high-speed optical network is challenged to a certain extent. Compared with algorithm security, physical layer security has the advantages of no need of key management and control distribution, no need of complex calculation, direct orientation to bottom layer data and the like, and particularly has the characteristics of low time delay and low power consumption, and is being applied to more and more high-speed security scenes. The physical layer security of a coherent optical communication system, which is a physical layer security technology for coherent optical communication, builds a foundation for high-speed, high-capacity coherent optical communication security.

The high-capacity and long-distance high-speed coherent optical fiber communication is basically in an unprotected state physically, and a corresponding safeguard measure is not provided to perfect a safety mechanism. The optical fiber eavesdropping behavior is occurred occasionally, and the eavesdropping method is also infinite, and mainly includes light beam splitting method, optical fiber bending, evanescent wave coupling, scattering, V-shaped groove and other methods. For high-speed coherent optical fiber communication with a communication rate of dozens of Gbps, a series of technical problems such as algorithm time, system time delay, key length and the like are brought by adopting an algorithm safety mode, and very high requirements are put forward on the performance of a computing platform of the algorithm. In order to solve the technical problems faced in high-speed coherent optical communication, physical layer secure communication needs to be solved urgently.

Disclosure of Invention

Technical problem to be solved

Based on the above problems, the present disclosure provides a physical layer secure communication apparatus for coherent optical communication and a method thereof, so as to alleviate technical problems of low secure communication speed and the like in the prior art.

(II) technical scheme

The present disclosure provides a physical layer secure communication apparatus of coherent optical communication, including:

the sending end can fill redundant data in the user information to form filling data; modulating the coherent light carrying the filling data to form data coherent light and outputting the data coherent light;

the receiving end can receive the data coherent light and process the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information.

In this embodiment of the present disclosure, the sending end includes:

a light source for outputting the coherent light;

the sending control platform is used for receiving the user information and filling the redundant data between the user information bits to form filling data; and can distribute the padding data to two branches for output in the form of single bit or multiple bits;

and the modulator is used for receiving the coherent light and the filling data, and modulating the coherent light through the electric signals of the two branches to obtain the data coherent light.

In an embodiment of the present disclosure, the receiving end includes:

the coherent receiver is used for receiving the data coherent light and processing the data coherent light to obtain two paths of electric signals which are the same as the two branches;

and the receiving control platform is used for receiving the two paths of electric signals sent by the coherent receiver and recovering data of the two paths of electric signals sent by the coherent receiver.

In the disclosed embodiment, the light source is a coherent light source of continuous light with a narrow linewidth, typically less than 100 kHz.

In the embodiment of the present disclosure, the modulator is a mach-zehnder modulator, and the modulation format of the mach-zehnder modulator is one of BPSK, QPSK, and 16 QAM.

In an embodiment of the disclosure, the coherent optical receiver processes the data coherent light by performing heterodyne coherent demodulation on the received data coherent light.

In the embodiment of the present disclosure, the sending control platform and the receiving control platform are implemented based on an FPGA.

In the embodiment of the present disclosure, the FPGA can send the user information recovered by the receiving end to the target user.

In this embodiment of the present disclosure, a transmission channel between the sending end and the receiving end is an optical fiber forming an optical fiber channel.

The present disclosure provides a physical layer secure communication method of coherent optical communication of the physical layer secure communication apparatus described in any one of the above, including:

filling redundant data in the user information to form filling data; and the coherent light is modulated to carry the filling data to form data coherent light;

processing the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information.

(III) advantageous effects

From the above technical solutions, the physical layer secure communication apparatus and method for coherent optical communication disclosed in the present disclosure have at least one or a part of the following beneficial effects:

(1) the physical layer security is realized without key management and control distribution, without complex calculation and directly facing to bottom layer data; and

(2) the method realizes the characteristics of low time delay and low power consumption, and is being applied to more and more high-speed security scenes.

Drawings

Fig. 1 is a schematic diagram of a physical layer secure communication apparatus for coherent optical communication according to an embodiment of the present disclosure.

Fig. 2 is a flowchart of a method of a physical layer secure communication method of coherent optical communication according to an embodiment of the present disclosure.

Detailed Description

The device realizes that the physical layer safety has the advantages of no need of key management and control distribution, no need of complex calculation and direct orientation to bottom layer data, realizes low time delay and low power consumption, and can overcome the main defects and shortcomings of the conventional safety communication device.

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

In an embodiment of the present disclosure, there is provided a physical layer secure communication apparatus for coherent optical communication, as shown in fig. 1, the physical layer secure communication apparatus including:

the sending end can fill redundant data in the user information to form filling data; modulating the coherent light carrying the filling data to form data coherent light and outputting the data coherent light;

the receiving end can receive the data coherent light and process the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information.

In this embodiment of the present disclosure, the sending end includes:

a light source for outputting the coherent light;

the sending control platform is used for receiving the user information and filling the redundant data between the user information bits to form filling data; and can distribute the padding data to two branches for output in the form of single bit or multiple bits;

and the modulator is used for receiving the coherent light and the filling data, and modulating the coherent light through the electric signals of the two branches to obtain the data coherent light.

In an embodiment of the present disclosure, the receiving end includes:

the coherent receiver is used for receiving the data coherent light and processing the data coherent light to obtain two paths of electric signals which are the same as the two branches;

and the receiving control platform is used for receiving the two paths of electric signals sent by the coherent receiver and recovering data of the two paths of electric signals sent by the coherent receiver.

In the disclosed embodiment, the light source is a coherent light source of continuous light with a narrow linewidth, typically less than 100 kHz.

In the disclosed embodiment, the modulator is a mach-zehnder modulator whose modulation format may be, but is not limited to, BPSK, QPSK, 16QAM, and other advanced coherent modulation formats.

In an embodiment of the disclosure, the coherent optical receiver processes the data coherent light by performing heterodyne coherent demodulation on the received data coherent light.

In the embodiment of the present disclosure, the sending control platform and the receiving control platform are implemented based on an FPGA.

In the embodiment of the present disclosure, the FPGA can send the user information recovered by the receiving end to the target user.

In this embodiment of the present disclosure, a transmission channel between the sending end and the receiving end is an optical fiber forming an optical fiber channel.

Specifically, in the embodiment of the present disclosure, as shown in fig. 1, the physical layer secure communication apparatus includes: the optical fiber modulator comprises five main components, namely a light source, a modulator part, a receiving and transmitting control platform based on an FPGA, an optical fiber transmission channel, a coherent receiving part and the like. And the FPGA control platform randomly sends the mixed data to the I branch and the Q branch by a single bit according to the hopping pattern, wherein one branch is the effective bit data of the user, and the other branch is the filled redundant bit. According to the QPSK modulation characteristic of coherent communication, user data bits are subjected to single-bit random hopping on four effective phase points according to the rule of a hopping pattern. Under the condition that an illegal user does not know the hopping pattern, the user information bit is difficult to steal, so that the safety performance of the user information is enhanced.

In the embodiment of the present disclosure, the light source at the transmitting end is a coherent continuous light source, which is characterized by a narrow line width and a high frequency stability. Typical values for linewidths are below 100 kHz. The modulator has an optical phase modulation function and is used for modulating I and Q branch information onto an optical phase parameter. The modulation modes comprise QPSK, 16QAM and the like, and different modulation modes correspond to different control platforms. The control platform mainly processes the user information, and after receiving the user information, redundant data is added according to different modulation modes. If a QPSK mode is adopted, filling single-bit redundant data at intervals of one bit randomly; if the 16QAM mode is adopted, two bits are spaced to randomly fill the double-bit redundant data. By analogy, the number of bits of the padded redundant data and the interval constitutes exactly one symbol unit of the modulation scheme. After filling, randomly hopping the filled data into two paths of data to be synchronously output according to the hopping patterns predetermined by the transmitter and the receiver, and entering the I and Q branches of the modulator. If QPSK mode is used, one branch of I and Q branches is user effective information, and the other branch is filled redundant information.

In the disclosed embodiment, the modulated coherent optical signal is transmitted by a transmission medium, which includes an optical fiber or free space. And after reaching a receiving end, carrying out receiving processing by using a coherent receiver to recover I and Q branch signals. The coherent receiver adopts a commercial mature coherent receiving scheme and comprises a 90-degree optical mixer, a balanced optical detector, a local oscillator light source and the like. The typical value of the line width and the frequency stability characteristic of the local oscillator light source are the same as those of the transmitting light source, and the central frequency points are consistent. The balanced light detector mainly comprises a balanced detector, a trans-impedance amplifier, a filter, an analog-to-digital converter and the like. The coherent receiver outputs I and Q branch information to be sent to an FPGA control platform at a receiving end. The FPGA control platform mainly completes two aspects of work, namely, the embedded data processing module is used for carrying out subsequent data processing work, and the FPGA control platform is used for carrying out user data recovery on the processed data. And the user data recovery is mainly characterized in that the jump sequence agreed by the transmitting and receiving parties is utilized to combine the two processed data and eliminate redundant data, so as to recover the effective data. The recovered data is received by the target user. Therefore, the physical layer secure communication of the coherent optical communication system with the random phase jump is completed.

The present disclosure also provides a physical layer secure communication method of coherent optical communication of any one of the above physical layer secure communication apparatuses, including:

filling redundant data in the user information to form filling data; and by modulating the coherent light carrying the padding data, as shown in fig. 2, data coherent light is formed;

processing the data coherent light to obtain the filling data; and recovering the filling data obtained by processing to obtain the user information.

Specifically, in the embodiment of the present disclosure, a physical layer secure communication method of coherent optical communication is that, on an FPGA platform, first, redundant data is randomly filled between user information bits, then, single-bit separation is performed on the filled data, then, single-bit information is randomly allocated on different I and Q modulation branches of a high-order phase modulator through control of an allocation sequence, and finally, through modulation of the high-order phase modulator, user information is randomly distributed on several selectable hopping phase points and is sent to a receiving end through a transmission channel. At a receiving end, firstly, a coherent receiver is adopted to recover a receiving sequence, and then inverse transformation opposite to the sending process is carried out through the FPGA to obtain user information. The method and the device have the effect that effective information bits of a user are randomly distributed on a certain branch of I and Q modulation, the other corresponding branch is filled with redundant information, and the effective information bits randomly jump on a plurality of selectable phase points according to a control sequence. Therefore, a physical layer safety mechanism of the coherent optical communication system carrying the random phase jump of the information is formed.

So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.

From the above description, those skilled in the art should have clear understanding of the physical layer secure communication apparatus and method for coherent optical communication of the present disclosure.

In summary, the present disclosure provides a physical layer secure communication apparatus and a method thereof for coherent optical communication, which implement that physical layer security has the characteristics of no need of key management and control distribution, no need of complex computation, direct orientation to underlying data, low time delay and low power consumption, and are being applied to more and more high-rate security scenarios.

It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.

And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.

Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.

In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.

The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.