An information transmission system and method based on optical fiber coding

Abstract

The present invention discloses an information transmission system and method based on optical fiber coding. The system includes: a light source, a circulator, a first SOA optical switch, a communication optical fiber provided with optical fiber coding, a signal generator, and a photoelectric detector for receiving the light wave signal of regular strain transmitted back by the optical fiber coding; a main control module for controlling the output of the light source, controlling the reception of the photoelectric detector, and identifying the light wave signal of regular strain. This scheme combines optical fiber sensing and optical fiber coding technology with optical fiber communication. The information input end does not need to be connected to the optical cable, but only strain excitation is performed on the outer layer of the optical cable. This can avoid the loss of effect of the existing transmission equipment after being invaded, thereby causing the effect that the communication cannot be completed. The optical fiber coded information transmission system uses the optical cable itself to transmit back to avoid illegal theft, and utilizes the unique identification characteristics and sensing characteristics of the optical fiber coding to achieve the unique identity recognition and stable signal transmission of the strain gauge.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication, and in particular to an information transmission system and method based on optical fiber coding. Background Art

[0002] The information transmission of existing fiber-optic communication systems mainly relies on the sending and receiving of bidirectional light waves and a large number of chips for signal transmission. Under special conditions (such as wireless signals cannot be used, fiber-optic transmission equipment is invaded, and long-distance physical media are required to transmit information), effective signal transmission cannot be carried out. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an information transmission system based on optical fiber coding, which can adapt to information transmission under special circumstances; the present invention also provides an information transmission method based on optical fiber coding.

[0004] According to an embodiment of the first aspect of the present invention, an information transmission system based on optical fiber coding includes: a light source for outputting an optical wave signal; a circulator, the circulator having a first port, a second port, and a third port; a first SOA optical switch is arranged between the first port of the circulator and the output end of the light source; a communication optical fiber, one end of the communication optical fiber is connected to the second port of the circulator, and the other end of the communication optical fiber is provided with an optical fiber coding; a signal generator is arranged on one side of the optical fiber coding on the communication optical fiber, and is used to generate a physical signal and act on the outer layer of the communication optical fiber to make the optical wave signal returned by the optical fiber coding strain according to a certain rule; a photodetector, a second SOA optical switch is arranged between the input end of the photodetector and the third port of the circulator, and is used to receive the optical wave signal returned by the optical fiber coding and strained according to the rule; a main control module is electrically connected to the light source and the photodetector respectively to control the output of the light source, control the reception of the photodetector, and identify the optical wave signal strained according to the rule.

[0005] The information transmission system based on optical fiber coding according to the first embodiment of the present invention has at least the following beneficial effects: the present solution combines optical fiber sensing, optical fiber coding technology and optical fiber communication. The information input end does not need to be connected to the optical cable but only performs strain excitation on the outer layer of the optical cable. This can avoid the loss of effectiveness of existing transmission equipment after being invaded, thereby causing the inability to complete communication. In particular, for certain information collection situations where wireless or satellite backhaul cannot be used, the optical fiber coded information transmission system uses the optical cable itself for backhaul to avoid illegal theft, and utilizes the unique identification characteristics and sensing characteristics of optical fiber coding to achieve unique identity identification and stable signal transmission of the strain gauge.

[0006] According to some embodiments of the first aspect of the present invention, the signal generator includes a fixed plate and a power supply, a control chip, and a strain gauge arranged on the fixed plate, the power supply supplies power to the control chip and the strain gauge, the control chip is used to control the strain gauge to output a physical signal according to certain rules, and one side of the optical fiber code on the communication optical fiber is fixed to the fixed plate and in contact with the strain gauge.

[0007] According to some embodiments of the first aspect of the present invention, the strain gauge is an electromagnetic vibrator, a heater or a stress generator.

[0008] According to some embodiments of the first aspect of the present invention, the strain gauge is an electromagnetic vibrator, the switching time difference of the electromagnetic vibrator is a basic signal element, the duration of the basic signal element is T0, and the waiting time between two adjacent basic signal elements is n*T0, where n is a positive integer.

[0009] According to some embodiments of the first aspect of the present invention, the switching pulse time of the first SOA optical switch and the second SOA optical switch is T, the switching time difference between the first SOA optical switch and the second SOA optical switch is n*T, and the length of the optical fiber coding distance to the photodetector is L=n*T*c*r / 2, where n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group.

[0010] According to an embodiment of the second aspect of the present invention, an information transmission method based on optical fiber coding includes the following steps: controlling a light source to send an optical wave signal; the optical wave signal generates a pulsed light wave through a first SOA optical switch and enters the communication optical fiber through a circulator; generating a physical signal and acting on the outer layer of the communication optical fiber at the location of the optical fiber coding, so that the optical wave signal returned by the optical fiber coding is strained according to a certain rule; controlling a photoelectric detector through the switching time of a second SOA optical switch to receive the optical wave signal returned by the circulator in the communication optical fiber to generate a pulsed light wave strained according to the rule; the photoelectric detector transmits the received pulsed light wave strained according to the rule to a main control module, and the main control module identifies the pulsed light wave strained according to the rule.

[0011] According to the second embodiment of the present invention, an information transmission method based on optical fiber coding has at least the following beneficial effects: this scheme combines optical fiber sensing, optical fiber coding technology and optical fiber communication. The information input end does not need to be connected to the optical cable but only performs strain excitation on the outer layer of the optical cable, which can avoid the loss of effectiveness of existing transmission equipment after being invaded, thereby causing the inability to complete communication. In particular, for certain information collection situations where wireless or satellite backhaul cannot be used, the optical fiber coded information transmission system uses the optical cable itself for backhaul to avoid illegal theft, and utilizes the unique identification characteristics and sensing characteristics of optical fiber coding to achieve unique identity recognition and stable signal transmission of the strain gauge.

[0012] According to some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, a temperature signal or a stress signal.

[0013] According to some embodiments of the second aspect of the present invention, the switching pulse time of the first SOA optical switch and the second SOA optical switch is T, the switching time difference between the first SOA optical switch and the second SOA optical switch is n*T, and the length of the optical fiber coding distance to the photodetector is L=n*T*c*r / 2, where n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group.

[0014] According to some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, the switching time difference of the vibration signal is a basic signal element, the duration of the basic signal element is T0, and the waiting time between two adjacent basic signal elements is n*T0, where n is a positive integer.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic diagram of an information transmission system according to an embodiment of the first aspect of the present invention;

[0018] Figure 2 A schematic diagram of a signal generator according to an embodiment of the first aspect of the present invention;

[0019] Figure 3 This is a flow chart of an information transmission method according to an embodiment of the second aspect of the present invention.

[0020] Reference numerals:

[0021] Light source 100 , circulator 200 , first SOA optical switch 210 , second SOA optical switch 220 , communication optical fiber 300 , optical fiber encoding 310 , signal generator 400 , fixing plate 410 , power supply 420 , control chip 430 , strain gauge 440 , photodetector 500 , main control module 600 . DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] refer to Figure 1 As shown, an information transmission system based on optical fiber coding is an embodiment of the first aspect of the present technical solution, comprising: a light source 100, for outputting an optical wave signal; a circulator 200, wherein the circulator 200 has a first port, a second port, and a third port; a first SOA optical switch 210 is arranged between the first port of the circulator 200 and the output end of the light source 100; a communication optical fiber 300, wherein one end of the communication optical fiber 300 is connected to the second port of the circulator 200, and the other end of the communication optical fiber 300 is provided with an optical fiber coding 310; a signal generator 400, which is arranged on the communication optical fiber 300 to generate an optical fiber coding signal. One side of 310 is used to generate a physical signal and act on the outer layer of the communication optical fiber 300 to make the light wave signal returned by the optical fiber code 310 strain according to a certain rule; a photodetector 500, a second SOA optical switch 220 is arranged between the input end of the photodetector 500 and the third port of the circulator 200, and is used to receive the light wave signal strained according to the rule returned by the optical fiber code 310; a main control module 600 is electrically connected to the light source 100 and the photodetector 500 respectively to control the output of the light source 100, control the reception of the photodetector 500 and identify the light wave signal strained according to the rule.

[0026] The circulator 200 is used to achieve the coupling of light waves, output the input light waves to the optical fiber, and output the reflected and scattered light waves in the optical fiber to the photodetector end. The signal generator 400 is used to generate a certain regular strain frequency sequence. When strain occurs, the light wave signal reflected and scattered by the optical fiber encoding will change in wavelength synchronously with the strain frequency.

[0027] This embodiment combines fiber optic coding and fiber optic sensing technology with fiber optic communication. The information input end does not need to be connected to the optical cable, but only strain excitation is performed on the outer layer of the optical cable. This can avoid the loss of effectiveness of existing transmission equipment after being invaded, which leads to the inability to complete communication. Especially for certain information collection situations where wireless or satellite return cannot be used, the fiber optic coded information transmission system uses the optical cable itself for return to avoid illegal theft, and utilizes the unique identification characteristics and sensing characteristics of the fiber optic coding to achieve unique identity recognition and stable signal transmission of the strain gauge.

[0028] In some embodiments of the first aspect of the present invention, Figure 2 As shown, the signal generator 400 includes a fixing plate 410 and a power supply 420, a control chip 430, and a strain gauge 440 arranged on the fixing plate 410. The power supply 420 supplies power to the control chip 430 and the strain gauge 440. The control chip 440 is used to control the strain gauge 440 to output a physical signal according to a certain rule. One side of the optical fiber code 310 of the communication optical fiber 300 is fixed (such as glue or other fasteners) on the fixing plate 410 and contacts the strain gauge 440. The control chip 430 controls the strain gauge 400 to strain according to a certain rule and strain according to a certain time rule, and converts the rule into a corresponding long and short signal or a 0, 1 signal. In combination with the operability and convenience of the system, the 0, 1 signal is finally preferably used to convert the binary code into a strain signal.

[0029] In some embodiments of the first aspect of the present invention, the strain gauge 440 is an electromagnetic vibrator, a heater or a stress generator. However, considering factors such as time control and energy consumption control (such as the heater is not conducive to heat dissipation control), it is finally considered to use an electromagnetically controlled vibrator; a single vibration has certain characteristics in its vibration waveform, but due to the influence of factors such as interference and distance, it is risky to identify the accurate feature points. However, this solution only identifies the vibration and continuous vibration time, which is easy to implement.

[0030] In some embodiments of the first aspect of the present invention, the switching pulse time of the first SOA optical switch 210 and the second SOA optical switch 220 is T, the switching time difference between the first SOA optical switch 210 and the second SOA optical switch 220 is n*T, and the length L of the optical fiber code 310 from the photodetector 500 is L=n*T*c*r / 2, where n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group.

[0031] In some embodiments of the first aspect of the present invention, the strain gauge 440 is an electromagnetic vibrator, the switching time difference of the electromagnetic vibrator is a basic signal element, the duration of the basic signal element is T0, and the waiting time between two adjacent basic signal elements is n*T0, where n is a positive integer.

[0032] After each basic signal element is sent, the main control module will sense a strain point and the start and end time of the strain; when the signal generator sends the strain signal according to a certain time pattern, the main control module can also sense the time pattern, with a basic signal element as 1 and n T0 intervals as 0, then a binary sequence code can be formed to achieve regular signal transmission.

[0033] like Figure 3 As shown, according to an embodiment of the second aspect of the present invention, an information transmission method based on optical fiber coding includes the following steps: controlling a light source to send an optical wave signal; the optical wave signal generates a pulsed light wave through a first SOA optical switch and enters the communication optical fiber through a circulator; generating a physical signal and acting on the outer layer of the communication optical fiber at the location of the optical fiber coding, so that the optical wave signal returned by the optical fiber coding is strained according to a certain rule; controlling the switching time of the second SOA optical switch to control a photoelectric detector to receive the optical wave signal returned by the circulator in the communication optical fiber to generate a pulsed light wave strained according to the rule; the photoelectric detector transmits the received pulsed light wave strained according to the rule to the main control module, and the main control module identifies the pulsed light wave strained according to the rule.

[0034] This embodiment combines fiber optic coding and fiber optic sensing technology with fiber optic communication. The information input end does not need to be connected to the optical cable, but only strain excitation is performed on the outer layer of the optical cable. This can avoid the loss of effectiveness of existing transmission equipment after being invaded, which leads to the inability to complete communication. Especially for certain information collection situations where wireless or satellite return cannot be used, the fiber optic coded information transmission system uses the optical cable itself for return to avoid illegal theft, and utilizes the unique identification characteristics and sensing characteristics of the fiber optic coding to achieve unique identity recognition and stable signal transmission of the strain gauge.

[0035] In some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, a temperature signal or a stress signal. When the optical fiber is affected by the external environment (such as temperature, pressure, vibration, etc.), the parameters such as the intensity, phase, frequency, polarization state, etc. of the light transmitted in the optical fiber will change accordingly.

[0036] In some embodiments of the second aspect of the present invention, the switching pulse time of the first SOA optical switch and the second SOA optical switch is T, the switching time difference between the first SOA optical switch and the second SOA optical switch is n*T, and the length of the optical fiber coding distance to the photodetector is L=n*T*c*r / 2, where n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group. The measurement accuracy l is the optical fiber length transmitted by the SOA switching pulse time T, l=T*c*r / 2.

[0037] In some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, the on-off time difference of the vibration signal (i.e., the interval time of the fiber coding wavelength change) is a basic signal element, the duration of the basic signal element is T0, and the photoelectric detector will detect that the time of continuous change of the fiber coding wavelength is close to T0, so the system recognizes a "1" code element, and the waiting time between two adjacent basic signal elements is n*T0, where n is a positive integer. Identify n "0" code elements to combine into a basic information binary sequence code.

[0038] After each basic signal element is sent, the main control module will sense a strain point and the start and end time of the strain; when the signal generator sends the strain signal according to a certain time pattern, the main control module can also sense the time pattern, with a basic signal element as 1 and n T0 intervals as 0, then a binary sequence code can be formed to achieve regular signal transmission.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An information transmission system based on optical fiber coding, characterized in that: include: A light source (100) for outputting a light wave signal; A circulator (200), the circulator (200) having a first port, a second port, and a third port; a first SOA optical switch (210) is provided between the first port of the circulator (200) and an output end of the light source (100); A communication optical fiber (300), one end of the communication optical fiber (300) being connected to the second port of the circulator (200), and the other end of the communication optical fiber (300) being provided with an optical fiber code (310); A signal generator (400) is arranged on one side of the optical fiber code (310) on the communication optical fiber (300), and is used to generate a physical signal and act on the outer layer of the communication optical fiber (300) so that the optical wave signal returned by the optical fiber code (310) is strained according to a certain rule; A photodetector (500), wherein a second SOA optical switch (220) is provided between an input end of the photodetector (500) and a third port of the circulator (200), and is used to receive a light wave signal of regular strain transmitted back by the optical fiber code (310); The main control module (600) is electrically connected to the light source (100) and the photodetector (500) respectively to control the output of the light source (100), control the reception of the photodetector (500), and identify the light wave signal that is regulated according to the rules.

2. The information transmission system based on optical fiber coding according to claim 1, characterized in that: The signal generator (400) comprises a fixing plate (410) and a power supply (420), a control chip (430), and a strain gauge (440) arranged on the fixing plate (410); the power supply (420) supplies power to the control chip (430) and the strain gauge (440); the control chip (430) is used to control the strain gauge (440) to output a physical signal according to a certain rule; and one side of the optical fiber code (310) on the communication optical fiber (300) is fixed on the fixing plate (410) and is in contact with the strain gauge (440).

3. The information transmission system based on optical fiber coding according to claim 2, characterized in that: The strain gauge (440) is an electromagnetic vibrator, a heater or a stress generator.

4. The information transmission system based on optical fiber coding according to claim 2, characterized in that: The strain gauge (440) is an electromagnetic vibrator, the on-off time difference of the electromagnetic vibrator is a basic signal element, the duration of the basic signal element is T0, and the waiting time between two adjacent basic signal elements is n*T0, where n is a positive integer.

5. The information transmission system based on optical fiber coding according to claim 1, characterized in that: The switching pulse time of the first SOA optical switch (210) and the second SOA optical switch (220) is T, the switching time difference between the first SOA optical switch (210) and the second SOA optical switch (220) is n*T, and the length L between the optical fiber code (310) and the photodetector (500) is n*T*c*r / 2, where n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group.

6. An information transmission method based on optical fiber coding, applied to the information transmission system based on optical fiber coding according to any one of claims 1 to 5, characterized in that: The following steps are included Control the light source to send light wave signals; The optical wave signal generates a pulse optical wave through the first SOA optical switch and enters the communication optical fiber through the circulator; Generate physical signals and act on the outer layer of the communication optical fiber where the optical fiber code is located, so that the optical wave signal returned by the optical fiber code is strained according to certain rules; The photoelectric detector receives the optical wave signal transmitted back through the circulator in the communication optical fiber by controlling the switching time of the second SOA optical switch to generate a pulsed optical wave according to the rule; The photoelectric detector transmits the received pulse light wave strained according to the rule to the main control module, and the main control module identifies the pulse light wave strained according to the rule.

7. The information transmission method based on optical fiber coding according to claim 6, characterized in that: The physical signal is a vibration signal, a temperature signal or a stress signal.

8. The information transmission method based on optical fiber coding according to claim 6, characterized in that: The switching pulse time of the first SOA optical switch and the second SOA optical switch is T, the switching time difference between the first SOA optical switch and the second SOA optical switch is n*T, and the length of the optical fiber coding distance to the photodetector is L=n*T*c*r / 2, where n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group.

9. The information transmission method based on optical fiber coding according to claim 6, characterized in that: The physical signal is a vibration signal, the on-off time difference of the vibration signal is a basic signal element, the duration of the basic signal element is T0, and the waiting time between two adjacent basic signal elements is n*T0, where n is a positive integer.

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