Optical encryption communication system and method based on bipolar circular polarization light detector

Abstract

The present invention discloses an optical encryption communication system and method based on a bipolar circular polarization light detector, and relates to the field of photoelectric detection. The optical encryption communication system based on the bipolar circular polarization light detector comprises a light source, an optical modulator, a bipolar circular polarization light detector and an oscilloscope arranged in sequence along an optical path; the bipolar circular polarization light detector is used to receive circularly polarized light and output a positive current or a negative current; the oscilloscope is used to read the current signal of the bipolar circular polarization light detector, where the positive current represents 1 and the negative current represents 0. The present invention generates a current by incidenting circularly polarized light on a bipolar circular polarization photodetector, and a change in the current size can be observed on an oscilloscope, where the negative current represents 0 and the positive current represents 1, so that a password is obtained, and the signal is decoded through an ACSII table, which does not require a secret key for encrypted communication.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric detection technology, and in particular to an optical encryption communication system, method and device based on a bipolar circularly polarized light detector. Background Art

[0002] In today's information age, the secure transmission and storage of information has become extremely important. With the continuous growth of data volume and the high sensitivity of information, traditional encryption technology faces many challenges.

[0003] In the field of optical communications, optical signals are widely used due to their advantages such as high speed and large capacity. However, the security of optical signals during transmission needs to be further guaranteed. Traditional encryption methods may have some limitations in optical communication scenarios, such as encryption efficiency and key management complexity.

[0004] Currently, most of the solutions for optical encryption communication based on polarized light use linearly polarized light, while the method of using circularly polarized light has not been mentioned. Encrypted communication of linearly polarized light requires a secret key for decoding, which is not conducive to the efficiency of encrypted communication.

[0005] Circularly polarized light has unique polarization properties and has potential advantages in optical information processing. Current ordinary photodetectors and linearly polarized photodetectors cannot respond differently to circularly polarized light, so we can use circularly polarized light and circularly polarized photodetectors for encrypted communication without the need for a secret key.

[0006] In addition, bipolar circular polarization photodetectors can generate currents in opposite directions for left-handed circularly polarized light (LCP) and right-handed circularly polarized light (RCP). This is different from the traditional use of current magnitude to represent 0 and 1 signals. We can directly use positive current to represent 1 and negative current to represent 0. This positive and negative current signal is more distinguishable. Summary of the invention

[0007] In view of the above problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the problem to be solved by the present invention is how to utilize the positive and negative currents generated by the bipolar circular polarization photodetector to perform encrypted communication.

[0009] In order to solve the above technical problems, in the first aspect, the present invention provides the following technical solutions: an optical encryption communication system based on a bipolar circularly polarized light detector, comprising a light source, an optical modulator, a bipolar circularly polarized light detector and an oscilloscope arranged in sequence along an optical path;

[0010] The bipolar circularly polarized light detector is used to receive circularly polarized light and output positive current or negative current;

[0011] The oscilloscope is used to read the current signal of the bipolar circularly polarized light detector, where a positive current represents 1 and a negative current represents 0.

[0012] As a preferred solution of the optical encryption communication system based on the bipolar circularly polarized light detector described in the present invention, the optical modulator is connected to a computer, and the computer is used to control the optical modulator so that the light passing through the optical modulator is converted into specified circularly polarized light.

[0013] As a preferred solution of the optical encryption communication system based on the bipolar circularly polarized light detector described in the present invention, the bipolar circularly polarized light detector includes a photosensitive layer and a first electrode layer and a second electrode layer respectively arranged on both sides of the photosensitive layer, and the first electrode layer and the second electrode layer are mutually chiral structures.

[0014] As a preferred solution of the optical encryption communication system based on the bipolar circularly polarized light detector described in the present invention, the first electrode layer and the second electrode layer are hollow structures, which respectively have a first channel and a second channel, and the first channel and the second channel have the same width and intersect with each other, and the angle between them is not equal to ninety degrees.

[0015] As a preferred solution of the optical encryption communication system based on the bipolar circularly polarized light detector described in the present invention, the material of the photosensitive layer is indium arsenide, and the materials of the first electrode layer and the second electrode layer are silver.

[0016] As a preferred solution of the optical encryption communication system based on the bipolar circularly polarized light detector described in the present invention, the thickness of the photosensitive layer is 90-110 nm, and the thickness of the first electrode layer and the second electrode layer is 15-25 nm.

[0017] In the second aspect, the present invention also provides an optical encryption communication method based on a bipolar circularly polarized light detector, which is applicable to the above-mentioned optical encryption communication system based on a bipolar circularly polarized light detector. The method includes converting the encrypted information into circularly polarized light and irradiating it on the above-mentioned bipolar circularly polarized light detector; connecting an oscilloscope to the bipolar circularly polarized light detector and receiving its current signal, defining positive current as 1 and negative current as 0.

[0018] As a preferred solution of the optical encryption communication method based on a bipolar circularly polarized light detector described in the present invention, the method of converting the encrypted information into circularly polarized light includes first converting the encrypted information into ACSII code, and then defining left-handed circularly polarized light as 0 and right-handed circularly polarized light as 1.

[0019] As a preferred solution of the optical encryption communication method based on the bipolar circularly polarized light detector of the present invention, the encrypted information is split into at least two groups, each group corresponds to one bipolar circularly polarized light detector and one oscilloscope.

[0020] In a third aspect, the present invention further provides a device, which includes the above-mentioned optical encryption communication system based on a bipolar circularly polarized light detector.

[0021] The invention has the following beneficial effects: the encryption system constructed by the invention through circularly polarized light and bipolar circularly polarized photodetector can generate negative current under the incidence of left-handed circularly polarized light and positive current under the incidence of right-handed circularly polarized light. The signal to be encrypted is converted into ACSII code, and then left-handed circularly polarized light is used to represent 0 and right-handed circularly polarized light is used to represent 1, and encryption is performed. The optical modulator is controlled by a computer to generate a specified circularly polarized light according to the ACSII code of the signal to be encrypted. Circularly polarized light is incident on a bipolar circularly polarized photodetector to generate a current, and the change in the current size can be observed on an oscilloscope, wherein the negative current represents 0 and the positive current represents 1, so that the password is obtained, and the signal is decoded through the ACSII table, which does not require a secret key for encrypted communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Schematic diagram of an optical encryption communication system based on a bipolar circularly polarized light detector.

[0024] Figure 2 This is the structural diagram of the bipolar circularly polarized light detector.

[0025] Figure 3 is a structural diagram of the first electrode layer.

[0026] Figure 4 is a structural diagram of the second electrode layer.

[0027] Figure 5 This is the binary ACSII code waveform of "SZDX".

[0028] Figure 6 Oscilloscope current diagram of "SZDX" in the optical encryption communication system based on bipolar circularly polarized photodetector under serial communication.

[0029] Figure 7Oscilloscope current waveform of the encryption system "SZDX", which needs to convert the encrypted signal into circularly polarized light and input it into a common photodetector and a linearly polarized photodetector.

[0030] Figure 8 Schematic diagram of the optical encryption communication system based on bipolar circular polarization photodetectors under parallel communication.

[0031] Fig. 9 This is the grouped ACSII code diagram of "SZDX".

[0032] Fig.10 Four sets of oscilloscope current diagrams of "SZDX" in the optical encryption communication system based on bipolar circularly polarized photodetectors under parallel communication.

[0033] In the figure: 1, light source; 2, optical modulator; 3, bipolar circularly polarized light detector; 4, oscilloscope; 6, photosensitive layer; 7, first electrode layer; 71, first channel; 72, second channel; 8, second electrode layer; 9, first insulating layer; 10, second insulating layer. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0037] Reference Figure 1 , which is the first embodiment of the present invention, provides an optical encryption communication system based on a bipolar circularly polarized light detector. The optical encryption communication system based on a bipolar circularly polarized light detector includes a light source 1, an optical modulator 2, a bipolar circularly polarized light detector 3 and an oscilloscope 4 arranged in sequence along the optical path.

[0038] The light source 1 is a laser light source, which can generate linearly polarized light with good coherence. The optical modulator 2 can be controlled by a computer to generate a specified circularly polarized light.

[0039] Better, refer to Figure 2 The bipolar circularly polarized light detector 3 includes a photosensitive layer 6 , a first electrode layer 7 and a second electrode layer 8 .

[0040] Specifically, the bipolar circularly polarized light detector includes, from bottom to top, a first insulating layer 9 , a first electrode layer 7 , a photosensitive layer 6 , a second electrode layer 8 and a second insulating layer 10 .

[0041] The first electrode layer 7 and the second electrode layer 8 are hollow chiral structures and are respectively located on both sides of the photosensitive layer 6. The photosensitive layer 6 fills the hollow gap between the first electrode layer 7 and the second electrode layer 8. A load is connected between the first electrode layer 7 and the second electrode layer 8.

[0042] Better, refer to Figure 3 and Figure 4 The structure of the first electrode layer 7 and the second electrode layer 8 includes a first channel 71 parallel to the length direction thereof and a second channel 72 intersecting the first channel 71, and the angle between the first channel 71 and the second channel 72 is not equal to ninety degrees. In this embodiment, the first channel 71 is located in the middle of the first electrode layer 7 and the second electrode layer 8, and the angle between the first channel 71 and the second channel 72 is 45°. The widths of the first channel 71 and the second channel 72 are both 40-60 nm, and the length of the second channel 72 is 150-250 nm.

[0043] Preferably, the first electrode layer 7 and the second electrode layer 8 have a thickness of 15-25 nm, a length of 3-10 μm, a period of 200 nm, and are made of silver.

[0044] Preferably, the material of the photosensitive layer 6 is indium arsenide, with a thickness of 90-110 nm. The material of the first insulating layer 9 and the second insulating layer 10 is silicon nitride, with a thickness of 200-240 nm.

[0045] The bipolar circularly polarized light detector 3 generates a negative current when receiving left-handed circularly polarized light, and generates a positive current when receiving right-handed circularly polarized light.

[0046] The oscilloscope 4 is used to receive the current signal of the bipolar circular polarization light detector 3 , where negative current represents 0 and positive current represents 1.

[0047] The present invention also provides an optical encryption communication method based on a bipolar circularly polarized light detector, which is applicable to the above-mentioned optical encryption communication system based on a bipolar circularly polarized light detector.

[0048] Specifically, the information to be encrypted is first converted into ACSII code. Then 0 represents left-handed circularly polarized light and 1 represents right-handed circularly polarized light. The optical modulator 2 is controlled by a computer so that the light emitted by the laser is converted into the specified circularly polarized light through the optical modulator 2. Then a bipolar circularly polarized photodetector 3 is placed at the receiving end, which generates a negative current for left-handed circularly polarized light and a positive current for right-handed circularly polarized light. The current signal is read by an oscilloscope, and the negative current represents 0 and the positive current represents 1 to decode the information.

[0049] After the system is built, this embodiment performs serial encryption communication on the information "SZDX". The decimal ACSII code, binary ACSII code and corresponding RCP (indicated by R in the table) and LCP (indicated by L in the table) of the signal to be encrypted are shown in Table 1.

[0050] Table 1: ACSII code and circularly polarized light corresponding to “SZDX”

[0051] ,

[0052] Its binary code is "01010011 01011010 01000100 01011000". The waveform of ACSII code is as follows: Figure 5 As shown, the oscilloscope needs to generate a waveform diagram with the same shape for decoding. This embodiment uses a light source with a wavelength of 2900nm.

[0053] Through the oscilloscope, we can get Figure 6 From the waveform shown, we can find that the oscilloscope displays opposite positive and negative signals, with a positive current of 2.5μA and a negative current of -2.7μA, where positive current represents 1 and negative current represents 0. By decoding the positive and negative currents, we finally get the password "01010011 01011010 01000100 01011000" and the corresponding signal is "SZDX", which is consistent with the encrypted signal.

[0054] Then the "SZDX" signal to be encrypted is converted into circularly polarized light and incident on the encryption system of ordinary photodetectors and linearly polarized photodetectors. The current waveform of the oscilloscope is as follows: Figure 7 As shown, it can be seen that ordinary photodetectors and linear polarization photodetectors cannot distinguish between LCP and RCP, and the oscilloscope produces almost no fluctuations.

[0055] As an optional embodiment, an optical encryption communication system based on bipolar circular polarization photodetectors under parallel communication includes: N groups of laser light sources 1, a computer, N groups of optical modulators 2, N groups of bipolar circular polarization photodetectors 3, and N groups of oscilloscopes 4.

[0056] In order to improve the efficiency of encrypted communication, the information to be encrypted is divided into N groups (N is an integer) in order, such as Figure 8 As shown. The optical modulators 2 of groups 1 to N are controlled by a computer so that the lasers of groups 1 to N are converted into designated circularly polarized light after passing through the optical modulators 2 and incident on the bipolar circularly polarized photodetectors 3 of groups 1 to N. The positive and negative currents of the oscilloscopes 4 of groups 1 to N are used to decipher the passwords corresponding to groups 1 to N, and then the passwords of the encrypted signals are synthesized to decipher the encrypted signals.

[0057] After the system is built, the information "SZDX" is encrypted and communicated in parallel. "SZDX" is divided into four groups, such as Fig. 9 "S" is the first group and its corresponding binary ACSII code is "01010011", "Z" is the second group and its corresponding binary ACSII code is "01011010", "D" is the third group and its corresponding binary ACSII code is "01000100", and "X" is the fourth group and its corresponding binary ACSII code is "01011000".

[0058] The computer controls the 1st to 4th optical modulators to generate the corresponding circularly polarized light. The current waveforms of the 1st to 4th groups are obtained through the oscilloscopes of the 1st to 4th groups, as shown in FIG. Fig. 9 As shown. It can be found that positive current represents 1 and negative current represents 0. The password for the first group is "01010011", the password for the second group is "01011010", the password for the third group is "01000100", and the password for the fourth group is "01011000". The total password is "1010011 01011010 01000100 01011000", and the corresponding information is "SZDX", which is successfully decoded.

[0059] This embodiment also provides a device, which includes the above-mentioned optical encryption communication system based on bipolar circularly polarized light detector.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An optical encryption communication system based on a bipolar circularly polarized light detector, characterized in that: It comprises a light source (1), an optical modulator (2), a bipolar circularly polarized light detector (3) and an oscilloscope (4) which are arranged in sequence along an optical path; The bipolar circularly polarized light detector (3) is used to receive circularly polarized light and output a positive current or a negative current; The oscilloscope (4) is used to read the current signal of the bipolar circularly polarized light detector (3), where a positive current represents 1 and a negative current represents 0; The bipolar circularly polarized light detector (3) comprises a photosensitive layer (6) and a first electrode layer (7) and a second electrode layer (8) respectively arranged on both sides of the photosensitive layer (6), the first electrode layer (7) and the second electrode layer (8) being mutually chiral structures; the bipolar circularly polarized light detector (3) generates currents in opposite directions when irradiated with left-handed circularly polarized light and right-handed circularly polarized light; The first electrode layer (7) and the second electrode layer (8) are hollow structures, and respectively have a first channel (71) and a second channel (72); the first channel (71) and the second channel (72) have the same width and intersect with each other, and the included angle is not equal to ninety degrees; The material of the photosensitive layer (6) is indium arsenide, and the material of the first electrode layer (7) and the second electrode layer (8) is silver; The thickness of the photosensitive layer (6) is 90-110 nm, and the thickness of the first electrode layer (7) and the second electrode layer (8) is 15-25 nm.

2. The optical encryption communication system based on a bipolar circularly polarized light detector as claimed in claim 1, characterized in that: The optical modulator (2) is connected to a computer (5), and the computer (5) is used to control the optical modulator (2) so that the light passing through the optical modulator (2) is converted into specified circularly polarized light.

3. An optical encryption communication method based on a bipolar circularly polarized light detector, characterized in that: include, Converting the encrypted information into circularly polarized light and irradiating the light onto the bipolar circularly polarized light detector (3) as claimed in claim 1; An oscilloscope (4) is connected to the bipolar circularly polarized light detector (3) to receive its current signal, with a positive current defined as 1 and a negative current defined as 0.

4. The optical encryption communication method based on a bipolar circularly polarized light detector as claimed in claim 3, characterized in that: The method for converting the encrypted information into circularly polarized light includes first converting the encrypted information into ACSII code, and then defining left-handed circularly polarized light as 0 and right-handed circularly polarized light as 1.

5. The optical encryption communication method based on a bipolar circularly polarized light detector as claimed in claim 4, characterized in that: The encrypted information is split into at least two groups, each group corresponding to one of the bipolar circularly polarized light detectors (3) and one of the oscilloscopes (4).

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