Optical physical unclonable function implementation device and control method thereof

Abstract

The application belongs to the technical field of secure optical communication, and discloses an optical physical unclonable function implementation device and a control method thereof, which comprises a digital optical challenge signal generation module, an amplification module, a laser nonlinear physical unclonable function module and a detection and processing module. An original optical signal is output to obtain a digital optical challenge signal through the digital optical challenge signal generation module; the digital optical challenge signal is output to obtain an analog optical response signal through the physical unclonable function module; the analog optical response signal is converted and sampled into a digital electrical response signal through the detection and processing module, and pre-registration or identity judgment is performed. The application uses a passive optical device behind a laser to provide an additional unclonable parameter dimension, breaks through the limitation of a too small nonlinear change range in the design of a laser physical unclonable function, has the advantages of high reliability, low cost and low implementation complexity, and provides a new design for an optical communication optical physical layer physical unclonable function.

Description

Technical Field

[0001] The present invention belongs to the technical field of secure optical communications, and in particular relates to an optical physical unclonable function implementation device and a control method thereof. Background Art

[0002] In the era of the Internet of Things (IoT), data security faces more complex risks and challenges than ever before. Optical communication networks, a crucial vehicle for storing and transmitting massive amounts of data, face a constant stream of security challenges. Modern optical network security often requires the coordinated implementation of multiple security technologies at multiple levels to address various challenges, including unauthorized access, eavesdropping, and interception.

[0003] Physical unclonable functions (PUFs), a security authentication technology based on the physical properties of hardware structures, are widely used in fields such as identity authentication, key generation, and random number generation. They are a reliable method for defending against intrusion attacks on digital memories. They exploit the unclonable physical nonlinear characteristics of hardware devices to generate unique responses or outputs in real time, making them virtually impossible to forge. A wide range of PPU designs exist, and various electronic PPU designs have also made significant progress in the integrated circuit field. Focusing on PPU solutions in optical communication network links, optical PPUs offer wider bandwidth, higher processing speeds, and more complex physical behavior than electronic PPUs, and possess inherent advantages for integration with optical communication links. Early PPU designs used cameras to capture the scattered two-dimensional optical speckle patterns of non-uniform block structures as a response. In recent years, PPU technologies based on micro-nano optical structures, specialized optical devices, or optical chaos have gained increasing attention. However, these technologies often suffer from high complexity, poor long-term stability, and difficulty integrating with commercial optical communication links, limiting their practical application.

[0004] Semiconductor lasers also exhibit unique internal nonlinear effects, as various physical parameters, including cavity length, cannot be perfectly consistent. This can be described by the classic Lang-Kobayashi equation. This nonlinearity has been applied to many fields, including optical chaos and optical frequency combs. Although the inherent nonlinearity of lasers is theoretically unique and difficult to implement, its control is extremely difficult, and the parameter space is very limited, leaving it vulnerable to cloning in practical applications. Therefore, the idea of ​​exploiting the inherent physical nonlinearity of lasers to design optical unclonable functions has not been further developed.

[0005] Through the above analysis, the problems and defects of the existing technology are: the existing optical physical unclonable function implementation device has high complexity, poor long-term stability, and is difficult to combine with optical communication links. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides an optical physical unclonable function implementation device and a control method thereof.

[0007] The present invention is implemented as follows: an optical physical unclonable function implementation device includes:

[0008] A digital optical challenge signal generation module, configured to output the original optical signal to obtain a digital optical challenge signal;

[0009] an amplification module, used for amplifying the digital optical challenge signal;

[0010] The laser nonlinear physics unclonable function module is used to perform nonlinear transformation on the digital optical challenge signal and output an analog optical response signal.

[0011] The detection and processing module is used to convert and sample the analog light response signal into a digital electrical response signal and perform pre-registration or identity judgment.

[0012] Furthermore, the digital optical challenge signal generation module includes a semiconductor laser, a phase modulator, an electrical amplifier, an arbitrary waveform generator, and a polarization controller;

[0013] The arbitrary waveform generator is used to generate a digital multi-cycle binary signal and input it into the electrical amplifier;

[0014] an electrical amplifier for amplifying the intensity of the electrical signal and transmitting the amplified electrical signal to the electrical port of the phase modulator; an optical port of the phase modulator for receiving the optical intensity signal output by the semiconductor laser;

[0015] Phase modulator, used to load the electrical binary signal generated by the arbitrary waveform generator into the phase of the optical signal to achieve the effect of binary amplitude keying modulation;

[0016] The polarization controller is used to adjust the polarization of the input optical signal to be consistent with the polarization direction of the distributed feedback laser, and its output is a digital optical challenge signal.

[0017] Furthermore, the amplification module includes an erbium-doped fiber amplifier:

[0018] Erbium-doped fiber amplifiers, used to adjust the intensity of digital optical challenge signals;

[0019] Furthermore, the laser nonlinear physical unclonable function module includes a first circulator, a distributed feedback laser, a second circulator and a random fiber Bragg grating;

[0020] a first optical circulator, for guiding a digital optical challenge signal into a distributed feedback laser and a nonlinear response signal into a random fiber Bragg grating;

[0021] a second optical circulator, for guiding the nonlinear response signal into the random fiber Bragg grating and the random backscattered light signal into the photoelectric converter;

[0022] Distributed feedback lasers use their back reflection effect to provide an unclonable nonlinear one-way transfer function, which causes the challenge optical signal to undergo a nonlinear transformation to obtain an intermediate response optical signal.

[0023] Random fiber Bragg grating uses the randomness of its structure and the randomness of the backscattering spectrum to make the intermediate response light signal produce the final response light signal through complex backscattering;

[0024] Furthermore, the detection and processing module includes a photoelectric converter, an oscilloscope and a data processing unit;

[0025] The photoelectric converter is used to convert the final response optical signal into an analog electrical response signal;

[0026] The oscilloscope is used to sample the analog electrical response signal;

[0027] The data processing unit is used to perform algorithm post-processing on the analog electrical response signal, mainly including alignment, normalization, randomness and reliability calculation, and correlation detection processing of the received signal sequence and the pre-registered signal sequence.

[0028] Another object of the present invention is to provide a method for controlling an optical-physical unclonable function implementation device, the method comprising:

[0029] Step 1: The transmitter generates a digital optical challenge signal, which is input into the physical unclonable function module for nonlinear transformation, and the output signal is an analog optical response signal;

[0030] Step 2: The analog light response signal is subjected to photoelectric conversion, oscilloscope sampling, alignment, quantization and post-processing to obtain the final digital binary response sequence for discrimination;

[0031] Step 3: The digital binary response sequence has a one-to-one correspondence with the digital optical challenge signal input, representing the quantitative embodiment of the nonlinear characteristics of the physical unclonable function and the identity proof;

[0032] Step 4: During the pre-registration phase, the binary response sequence under the same digital optical challenge signal is tested multiple times as the authentication standard. During the authentication phase, the real-time generated binary response sequence is compared with the template to complete the authentication function of the physical unclonable function module.

[0033] Furthermore, in step 1, the original optical signal generated by the semiconductor laser passes through the phase modulator and the polarization controller in sequence, and the digital challenge optical signal is output.

[0034] Furthermore, in the step 1, the digital optical challenge optical signal is guided by an optical circulator and sequentially passes through a distributed feedback laser and a random fiber Bragg grating to output an analog optical response signal.

[0035] Furthermore, in step 2, a dual-threshold quantization algorithm is used to quantize the simulated light response signal:

[0036]

[0037]

[0038] Among them, T up (T down ) represents the high (low) threshold calculated according to the mean, standard deviation and manually selected scalar ε, C(y) represents the analog signal sequence used for quantization, A(y) represents the binary sequence after double threshold quantization, T up and T down The sample values ​​between are discarded;

[0039] The analog light response signals A(y) and A'(y) are calibrated and normalized before quantization. The two columns of sequences share the position serial numbers of the discarded analog values ​​and discard the inconsistent parts to ensure that their sequence lengths are consistent.

[0040] Furthermore, the reliability and randomness of the output of the physical unclonable function are evaluated by the fractional Hamming distance, which is calculated as follows:

[0041]

[0042]

[0043] where R A and R' A represents the n-bit binary response obtained by injecting the same challenge signal into the physical non-cloned function replica A at different times, FHD(R A , R' A ) is used to measure the difference between two acquired response sequences, indicating the probability of a single response bit change, with an ideal value of 0;

[0044] R A and R B represents the binary response signal extracted by the physical unclonable function replica A and the other replica B under the same challenge signal input, FHD(R A , R B ) represents R A and R B The probability of different bits appearing in binary sequences is ideally 50%.

[0045] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0046] First, the present invention designs an active-passive collaborative laser nonlinear physical unclonable function structure based on distributed feedback lasers and random fiber Bragg gratings. The present invention uses a random fiber Bragg grating placed behind the laser to provide additional unclonable parameter dimensions to compensate for the limitations of laser nonlinearity. The present invention has similar randomness to other optical physical unclonable function designs, but has the advantages of higher reliability, low cost, and low implementation complexity, opening up new ideas for designing physical unclonable functions based on laser nonlinearity. In addition, the active-passive physical unclonable function design structure improves the ability to deal with modeling attacks and has certain advantages in terms of updates and replacements.

[0047] Second, the present invention provides an active-passive cooperative laser nonlinear physical unclonable function design scheme based on distributed feedback lasers and random fiber Bragg gratings. The random fiber Bragg grating placed after the laser is used to provide additional unclonable parameter dimensions to compensate for the limitation of the laser's nonlinear variation range being too small. This improves the concept of optical unclonable function technology based on laser nonlinearity and provides new ideas for the design of physical unclonable functions in the physical layer of optical communications.

[0048] Third, as auxiliary evidence for the inventiveness of the claims of the present invention, it is also reflected in the following important aspects:

[0049] (1) The expected benefits and commercial value of the technical solution of the present invention after transformation are:

[0050] The technical solution of the present invention can be applied to optical communication links and can be built based on the nonlinear characteristics of the transceiver. It is compatible with existing optical communication transmission links to realize the authentication function of the sender and receiver, and has great commercial value.

[0051] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad:

[0052] The technical solution of this invention relies on the nonlinearity of lasers and innovatively uses passive optical components to amplify these characteristics, making it suitable for the security requirements of physical unclonable functions. Compared to other optical-physical unclonable function designs, this invention offers the advantages of higher reliability, lower cost, lower implementation complexity, and easier upgrades. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a structural block diagram of a device for implementing a physical unclonable function provided by an embodiment of the present invention;

[0054] Figure 2 is a control method flowchart of a physical unclonable function implementation device provided by an embodiment of the present application;

[0055] Figure 3 is a spectrum diagram provided by an embodiment of the present application;wherein (a) is a spectrum diagram of a semiconductor laser in a free running state, (b) is a spectrum diagram of a distributed feedback laser in a free running state and under laser injection, and (c) is a backscattering spectrum diagram of a random fiber Bragg grating;

[0056] Figure 4 is a correlation scatter diagram generated in real time provided by an embodiment of the present application;wherein (a) is a correlation scatter diagram between challenge-response pairs, and (b) is a correlation scatter diagram between pre-registered challenge-response pairs. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0058] As shown in Figure 1 , the optical physical unclonable function implementation device provided by the embodiment of the present application comprises a digital light challenge signal generation module, an amplification module, a laser nonlinear physical unclonable function module, and a detection and processing module, wherein the digital light challenge signal generation module comprises a semiconductor laser 1, a phase modulator 2, an electrical amplifier 3, an arbitrary waveform generator 4, and a polarization controller 5;the amplification module comprises an erbium-doped fiber amplifier 6;the laser nonlinear physical unclonable function module comprises a first optical circulator 7, a distributed feedback laser 8, a second optical circulator 9, and a random fiber Bragg grating 10;the detection and processing module comprises an optoelectronic converter 11, an oscilloscope 12, and a data processing unit 13.

[0059] The PRBS signal output by the arbitrary waveform generator 4 enters the electrical amplifier 3 for amplification, and then enters the electrical port of the phase modulator 2 to modulate the phase of the optical signal passing therethrough. The original optical signal generated by the semiconductor laser 1 passes through the phase modulator 1, the polarization modulator 5 and the erbium-doped fiber amplifier 6 to obtain a digital optical challenge signal. Among them, the polarization modulator 5 is used to adjust the polarization of the digital optical challenge signal to be consistent with the polarization direction of the distributed feedback laser 8, and the erbium-doped fiber amplifier 6 is used to adjust the injection light intensity of the digital optical challenge signal. Under the guidance of the first optical circulator and the second optical circulator, the digital optical challenge signal is successively injected into the distributed feedback laser 8 and the random light Bragg grating 10, undergoing nonlinear transformation to obtain an analog optical response signal. The analog optical response signal enters the optical port of the photoelectric converter 11, and the electrical port of the photoelectric converter is connected to the oscilloscope 12. The analog electrical response signal sequence sampled by the oscilloscope 12 enters the data processing unit 13.

[0060] In this embodiment of the present invention, the main purpose of the technical solution provided is to implement an optical unclonable function (OPUF) to generate a unique optical response related to input data. This solution includes a digital optical challenge signal generation module, an amplification module, a laser nonlinear unclonable function module, and a detection and processing module.

[0061] The digital optical challenge signal generation module consists of a semiconductor laser, a phase modulator, an electrical amplifier, an arbitrary waveform generator, and a polarization controller. The PRBS signal output by the arbitrary waveform generator is amplified by the electrical amplifier and then enters the phase modulator to modulate the optical signal phase. The original optical signal passes through the phase modulator, polarization modulator, and erbium-doped fiber amplifier to form the digital optical challenge signal. The polarization modulator ensures that the polarization direction of the digital optical challenge signal is consistent with that of the distributed feedback laser, while the erbium-doped fiber amplifier adjusts the injection intensity of the digital optical challenge signal.

[0062] The amplification module consists of an erbium-doped fiber amplifier, which is used to enhance the optical power of the digital optical challenge signal.

[0063] The laser nonlinear physics unclonable function module consists of a first optical circulator, a distributed feedback laser, a second optical circulator, and a random fiber Bragg grating. Guided by the first and second optical circulators, a digital optical challenge signal is injected into the distributed feedback laser and the random fiber Bragg grating, where it undergoes nonlinear transformations such as material nonlinearity and optical mode competition, resulting in a simulated optical response signal.

[0064] The detection and processing module consists of an optoelectronic converter, an oscilloscope, and a data processing unit. The analog optical response signal enters the optical port of the optoelectronic converter, undergoes optoelectronic conversion, and is converted into an electrical signal. This electrical signal is further sampled by the oscilloscope to produce an analog electrical response signal sequence, which then enters the data processing unit for processing. The data processing unit filters, reduces noise, and extracts features from the analog electrical response signal to generate a unique optical response associated with the input data, thus achieving an optical unclonable function.

[0065] In summary, the implementation process of the technical solution provided by the embodiments of the present invention includes the generation of a digital optical challenge signal, its amplification, its injection and nonlinear transformation, and the acquisition and processing of an analog electrical response signal. These steps yield a unique optical response related to the input data, thereby achieving an optically unclonable function.

[0066] The digital challenge signal generation module is only used to generate an optical challenge signal with appropriate parameters. This function can be achieved by using other modulation formats besides binary amplitude keying, such as orthogonal frequency division multiplexing modulation, orthogonal amplitude modulation, and even chaotic signals.

[0067] The random fiber Bragg grating 10 is used to expand the nonlinear spatial dimension of the distributed feedback laser 8 and enhance the overall non-cloning capability. Figure 3 It can be seen that the beat frequency phenomenon within the distributed feedback laser 8 causes a secondary peak to appear in its output spectrum. The height, width, and position of the secondary peak depend on the nonlinear characteristics of the laser. After passing through the random fiber Bragg grating 10, the complex reflection effects within it, which cannot be artificially manufactured or reproduced, cause the shape of this secondary peak to change significantly. The structure that achieves this function can use other types of passive optical devices such as gratings, optical microcavities, etc. In addition, the combination of the random fiber Bragg grating 10 after the distributed feedback laser can also adopt other types of combination methods, such as pre-placement, loop, embedded, etc.

[0068] In the detection and processing module, the data processing unit 13 mainly adopts a quantization method of dual threshold quantization and an authentication process of calculating fractional Hamming distance and correlation. Figure 4 The correlation scatter plot of the same and different physical unclonable function module copies is shown. In practical applications, quantification and authentication algorithms can be used to distinguish different physical unclonable function module copies and identify the same physical unclonable function module copies.

[0069] The working principle of the present invention is as follows: the original optical signal generated by the semiconductor laser 1 passes through the phase modulator 2 and the polarization controller 5 in sequence, and the digital challenge optical signal is output; the digital challenge optical signal is guided by the first optical circulator 7 and the second optical circulator 9 and passes through the distributed feedback laser 8 and the random fiber Bragg grating 10 in sequence, and the analog response optical signal is output; the analog response optical signal is converted by the photoelectric converter 11 and sampled by the oscilloscope 12, and the response sequence for judgment is output; the response sequence is aligned in the data processing unit 13 and processed by the normalization algorithm to obtain a digital response sequence. The digital response sequence can be used for physical unclonable function performance testing and certification.

[0070] like Figure 2 As shown, the control method of the optical physical unclonable function implementation device provided by the embodiment of the present invention includes the following steps:

[0071] The transmitter generates a digital sequence of challenge signals, which is a digital optical challenge signal. This challenge signal is input into the physical unclonable function module for nonlinear transformation, and the output signal is an analog optical response signal. The original analog optical response signal undergoes photoelectric conversion, oscilloscope sampling, alignment, and quantization, and then is processed to obtain the final digital binary response sequence used for discrimination. The digital binary response sequence has a one-to-one correspondence with the digital optical challenge signal input, representing the quantitative embodiment of the nonlinear characteristics of the physical unclonable function and identity verification. In the pre-registration stage, the binary response sequence under the same digital optical challenge signal is tested multiple times as the authentication standard; in the authentication stage, the real-time generated binary response sequence is compared with the template to complete the authentication function of the physical unclonable function module.

[0072] In this embodiment of the present invention, laser output light is injected into a random fiber Bragg grating (FBG). Due to differences in reflection coefficients at different wavelengths, the multiple peaks of the injected light result in non-clonable variations in the intensity of the reflected spectrum. A dual-threshold quantization algorithm is used to process the simulated response signal. The basic principles are as follows:

[0073]

[0074]

[0075] Among them, T up (T down ) represents the high (low) threshold calculated based on the mean, standard deviation, and manually selected scalar ε. C(y) represents the analog signal sequence used for quantization, and A(y) and A'(y) represent the binary sequence after double threshold quantization. up and T downThe sample values ​​between will be discarded. In addition, it is necessary to calibrate and normalize the analog signal sequences A(y) and A'(y) before quantization. The two sequences will share the position sequence number of the discarded analog value and discard the inconsistent parts to ensure that their sequence lengths are consistent.

[0076] In this embodiment of the present invention, to evaluate the functionality of the proposed PUC based on laser nonlinearity and random grating, the reliability and randomness of the PUC output are primarily considered. These are evaluated using the Fractional Hamming Distance (FHD). The calculation formula is as follows:

[0077]

[0078]

[0079] where R A and R' A represents the n-bit binary response obtained by injecting the same challenge signal into the physical non-cloned function replica A at different times, FHD(R A , R' A ) is used to measure the difference between two acquired response sequences, indicating the probability of a single response bit change, with an ideal value of 0;

[0080] R A and R B represents the binary response signal extracted by the physical unclonable function replica A and the other replica B under the same challenge signal input, FHD(R A , R B ) represents R A and R B The probability of different bits appearing in binary sequences is ideally 50%, indicating no correlation between the response bit sequences.

[0081] In the embodiment, as the injection intensity changes, there are obvious differences in the challenge-response pairs generated by different physical unclonable function copies. The average FHD of the legitimate physical unclonable function copies gradually decreases from 0.1149 to 0.0110 (the ideal value is 0), and the correlation coefficient increases from 0.81081 to 0.97624; the average FHD of the illegal physical unclonable function copies decreases from 0.2858 to 0.1851 (the ideal value is 0.5), and the CC is between 0.44194 and 0.55383. The FHD values ​​between legitimate and illegal copies always have obvious interval differences. When an FHD threshold for judgment is introduced, such as 0.15, the function of authentication distinction can be achieved.

[0082] In this structure, all devices used are commercially available general-purpose optoelectronic communication devices, which do not require special customization and are easy to implement.

[0083] Example:

[0084] The half-wave voltage of phase modulator 2 was 3.5V, the voltage of electrical amplifier 3 was 200mV, and the modulation rate was 5Gbit / s. The free-running current of distributed feedback laser 8 was set to 30mA, the output optical power was 4.4dBm, and the central wavelength was 1549.13nm. A multi-cycle binary sequence with a transmission rate of 5Gbit / s was input as a digital challenge. The oscilloscope sampling rate was 100GSample / s to obtain the response analog waveform.

[0085] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0086] It should be noted that the embodiments of the present invention can be implemented by hardware, software, or a combination of software and hardware. The hardware portion can be implemented using dedicated logic; the software portion can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. Those skilled in the art will appreciate that the above-mentioned devices and methods can be implemented using computer-executable instructions and / or contained in processor control code, for example, such as a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., can also be implemented by software executed by various types of processors, or can be implemented by a combination of the above-mentioned hardware circuits and software, such as firmware.

[0087] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. An optical physics unclonable function implementation device, characterized in that: include: A digital optical challenge signal generation module, configured to output the original optical signal to obtain a digital optical challenge signal; an amplification module, used for amplifying the digital optical challenge signal; Laser nonlinear physics unclonable function module, used to perform nonlinear transformation on digital optical challenge signals and output analog optical response signals; Detection and processing module, used to convert and sample analog optical response signals into digital electrical response signals and perform pre-registration or identity determination; The laser nonlinear physical unclonable function module includes a first circulator, a distributed feedback laser, a second circulator and a random fiber Bragg grating; a first optical circulator, for guiding a digital optical challenge signal into a distributed feedback laser and a nonlinear response signal into a random fiber Bragg grating; a second optical circulator, for guiding the nonlinear response signal into the random fiber Bragg grating and the random backscattered light signal into the photoelectric converter; Distributed feedback lasers use their back reflection effect to provide an unclonable nonlinear one-way transfer function, which causes the challenge optical signal to undergo a nonlinear transformation to obtain an intermediate response optical signal. Random fiber Bragg grating uses the randomness of its structure and the randomness of the backscattering spectrum to make the intermediate response light signal generate the final response light signal through complex backscattering.

2. The optical physical unclonable function implementation device according to claim 1, characterized in that: The digital optical challenge signal generation module includes a semiconductor laser, a phase modulator, an electrical amplifier, an arbitrary waveform generator, and a polarization controller; The arbitrary waveform generator is used to generate a digital multi-cycle binary signal and input it into the electrical amplifier; an electrical amplifier, configured to amplify the strength of the electrical signal and transmit the amplified electrical signal to the electrical port of the phase modulator; The optical port of the phase modulator is used to receive the light intensity signal output by the semiconductor laser; Phase modulator, used to load the electrical binary signal generated by the arbitrary waveform generator into the phase of the optical signal to achieve the effect of binary amplitude keying modulation; The polarization controller is used to adjust the polarization of the input optical signal to be consistent with the polarization direction of the distributed feedback laser, and its output is a digital optical challenge signal.

3. The optical physical unclonable function implementation device according to claim 1, characterized in that: The amplification module includes an erbium-doped fiber amplifier: Erbium-doped fiber amplifiers are used to adjust the intensity of digital optical challenge signals.

4. The optical physical unclonable function implementation device according to claim 1, characterized in that: The detection and processing module includes a photoelectric converter, an oscilloscope and a data processing unit; The photoelectric converter is used to convert the final response optical signal into an analog electrical response signal; The oscilloscope is used to sample the analog electrical response signal; The data processing unit is used to perform algorithm post-processing on the analog electrical response signal, mainly including alignment, normalization, randomness and reliability calculation, and correlation detection processing of the received signal sequence and the pre-registered signal sequence.

5. A control method for implementing the optical physical unclonable function implementation device according to any one of claims 1 to 4, characterized in that: The control method of the optical physical unclonable function implementation device includes: Step 1: The transmitter generates a digital optical challenge signal, which is input into the physical unclonable function module for nonlinear transformation, and the output signal is an analog optical response signal; Step 2: The analog light response signal is subjected to photoelectric conversion, oscilloscope sampling, alignment, quantization and post-processing to obtain the final digital binary response sequence for discrimination; Step 3: The digital binary response sequence has a one-to-one correspondence with the digital optical challenge signal input, representing the quantitative embodiment of the nonlinear characteristics of the physical unclonable function and the identity proof; Step 4: During the pre-registration phase, the binary response sequence under the same digital optical challenge signal is tested multiple times as the authentication standard. During the authentication phase, the real-time generated binary response sequence is compared with the template to complete the authentication function of the physical unclonable function module.

6. The control method of the optical physical unclonable function implementation device according to claim 5, characterized in that: In the step 1, the original optical signal generated by the semiconductor laser passes through the phase modulator and the polarization controller in sequence, and the digital challenge optical signal is output.

7. The control method of the optical physical unclonable function implementation device according to claim 6, characterized in that: In the step 1, the digital optical challenge optical signal is guided by an optical circulator and sequentially passes through a distributed feedback laser and a random fiber Bragg grating to output an analog optical response signal.

8. The control method of the optical physical unclonable function implementation device according to claim 6, characterized in that: In the second step, a dual-threshold quantization algorithm is used to quantize the simulated light response signal: ； ； in, / represents the high / low threshold calculated based on the mean, standard deviation and manually selected scalar ε, C(y) represents the analog signal sequence used for quantization, A(y) represents the binary sequence after double threshold quantization, T up and T down The sample values ​​between are discarded; The simulated light response signals A(y) and A'(y) are calibrated and normalized before quantization. The two columns of sequences share the position serial numbers of the discarded simulated values ​​and discard the inconsistent parts to ensure that their sequence lengths are consistent.

9. The control method of the optical physical unclonable function implementation device according to claim 6, characterized in that: The reliability and randomness of the output of the physical unclonable function are evaluated by the fractional Hamming distance, which is calculated as follows: ； ； where R A and R' A represents the n-bit binary response obtained by injecting the same challenge signal into the physically uncloned function replica A at different times, FHD(R A , R' A ) is used to measure the difference between two acquired response sequences, indicating the probability of a single response bit change, with an ideal value of 0; R A and R B represents the binary response signal extracted by the physical non-cloning function replica A and the other replica B under the same challenge signal input, FHD (R A , R B ) represents R A and R B The probability of different bits appearing in a binary sequence is ideally 50%.

Images