CN212413162U - Bidirectional information transmission system based on optical fiber coding - Google Patents
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Abstract
The invention discloses a bidirectional information transmission system based on optical fiber coding, which comprises a first transmission terminal and a second transmission terminal, wherein the first transmission terminal and the second transmission terminal both comprise: the device comprises a light source, a circulator, a first SOA optical switch, a communication optical fiber provided with an optical fiber code, a signal generator and a photoelectric detector; and the main control module is used for controlling the output of the light source, controlling the receiving of the photoelectric detector and identifying the light wave signal which is strained according to the rule. The main control modules of the first transmission terminal and the second transmission terminal are respectively electrically connected with the signal generator of the other side for editing the physical signals to be sent; according to the scheme, optical fiber sensing, an optical fiber coding technology and optical fiber communication are combined, an information input end is not connected with an optical cable but only carries out strain excitation on the outer layer of the optical cable, and pure physical bidirectional information transmission is realized through double-optical-fiber connection between two transmission terminals.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a bidirectional information transmission system based on optical fiber coding.
Background
The information transmission of the existing optical fiber communication system mainly depends on the sending and receiving of bidirectional light waves, information to be transmitted is input into a sender at a sending end, the information is superposed or modulated onto a carrier wave serving as an information signal carrier, then the modulated carrier wave is transmitted to a far receiving end through a transmission medium (optical fiber), and the original information is demodulated by a receiver. However, this conventional method is not suitable for special situations, such as requiring bidirectional transmission without using optical wave direct signals.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a bidirectional information transmission system based on optical fiber coding, which can adapt to information transmission under special conditions; the invention also provides a bidirectional information transmission method based on the optical fiber coding.
According to an embodiment of the first aspect of the present invention, a bidirectional information transmission system based on optical fiber coding includes a first transmission terminal and a second transmission terminal, where the first transmission terminal and the second transmission terminal both include: a light source for outputting a light wave signal; a 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; one end of the communication optical fiber is connected with the second port of the circulator, and the other end of the communication optical fiber is provided with an optical fiber code; the signal generator is arranged on one side of the optical fiber code on the communication optical fiber and used for generating a physical signal and acting on the outer layer of the communication optical fiber so as to enable the optical wave signal returned by the optical fiber code to generate strain according to a certain rule; a second SOA optical switch is arranged between the input end of the photoelectric detector and the third port of the circulator and is used for receiving the regularly strained light wave signal returned by the optical fiber code; the main control module is respectively and electrically connected with the light source and the photoelectric detector and is used for controlling the output of the light source, controlling the receiving of the photoelectric detector and identifying the optical wave signals which are strained according to rules; the main control modules of the first transmission terminal and the second transmission terminal are respectively electrically connected with the signal generator of the other side to edit the physical signals to be sent.
The bidirectional information transmission system based on optical fiber coding according to the first embodiment of the present invention has at least the following advantages: the scheme combines optical fiber sensing, an optical fiber coding technology and optical fiber communication, an information input end does not need to be connected into an optical cable but only carries out strain excitation on the outer layer of the optical cable, pure physical two-way information transmission is realized through double optical fiber connection between two transmission terminals, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be completed can be avoided, especially, the optical fiber coded information transmission system uses the optical cable to transmit back so as to avoid illegal stealing, and the unique identification characteristic and the sensing characteristic of the optical fiber coding are utilized, so that the unique identification and stable signal transmission of a strain gauge are realized.
According to some embodiments of the first aspect of the present invention, the signal generator includes a fixing plate, and a power supply, a control chip, and a strain gauge disposed on the fixing plate, the power supply supplies power to the control chip and the strain gauge, the control chip is electrically connected to the main control module on the transmitting side for controlling the strain gauge to output a physical signal according to a certain rule, and one side of the optical fiber code on the communication optical fiber is fixed on the fixing plate and is in contact with the strain gauge.
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.
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 one basic signal element, the duration of the basic signal element is T0, and the waiting time of two adjacent basic signal elements is n × T0, where n is a positive integer.
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, the length L of the optical fiber code from the photodetector 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.
According to the second aspect of the invention, the bidirectional information transmission method based on the optical fiber coding comprises the following steps: controlling a light source to send a light wave signal; the light wave signal generates pulse light waves through the first SOA optical switch, and the pulse light waves enter the communication optical fiber through the circulator; the main control module at the transmitting side controls the signal generator to generate a physical signal and acts on the outer layer of the communication optical fiber at the position of the optical fiber code so as to enable the optical wave signal returned by the optical fiber code to be strained according to a certain rule; the photoelectric detector is controlled to receive the light wave signal returned by the circulator in the communication optical fiber through the switching time of the second SOA optical switch to generate pulse light waves which are strained according to rules; the photoelectric detector transmits the pulse light waves received by the photoelectric detector according to the rule strain to the main control module at the receiving side, and the main control module at the receiving side identifies the pulse light waves according to the rule strain.
The bidirectional information transmission method based on the optical fiber coding according to the second embodiment of the invention has at least the following advantages: the scheme combines optical fiber sensing, an optical fiber coding technology and optical fiber communication, an information input end does not need to be connected into an optical cable but only carries out strain excitation on the outer layer of the optical cable, pure physical two-way information transmission is realized through double optical fiber connection between two transmission terminals, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be completed can be avoided, especially, the optical fiber coded information transmission system uses the optical cable to transmit back so as to avoid illegal stealing, and the unique identification characteristic and the sensing characteristic of the optical fiber coding are utilized, so that the unique identification and stable signal transmission of a strain gauge are realized.
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.
According to some embodiments of the second aspect of the present invention, the switching pulse time of the first and second SOA optical switches is T, the switching time difference between the first and second SOA optical switches is n × T, the length L of the fiber code from the photodetector is n × T c × r/2, where n is a positive integer, c is the speed of light, and r is the fiber group refractive index.
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 of two adjacent basic signal elements is n × T0, where n is a positive integer.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a bidirectional information transmission system according to an embodiment of the first aspect of the present invention;
FIG. 2 is a schematic diagram of a signal generator according to an embodiment of the first aspect of the present invention;
fig. 3 is a flowchart of an information transmission method according to a second aspect of the present invention.
Reference numerals:
the optical fiber communication device comprises a light source 100, a circulator 200, a first SOA optical switch 210, a second SOA optical switch 220, a communication optical fiber 300, an optical fiber code 310, a signal generator 400, a fixing plate 410, a power supply 420, a control chip 430, a strain gauge 440, a photoelectric detector 500 and a main control module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, a bidirectional information transmission system based on optical fiber coding according to an embodiment of a first aspect of the present disclosure includes a first transmission terminal and a second transmission terminal, where the first transmission terminal and the second transmission terminal both include: a light source 100 for outputting a lightwave 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 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 with the second port of the circulator 200, and the other end of the communication optical fiber 300 is provided with an optical fiber code 310; a signal generator 400, disposed on one side of the optical fiber code 310 on the communication optical fiber 300, for generating a physical signal and acting on the outer layer of the communication optical fiber 300 to make the optical wave signal returned by the optical fiber code 310 generate strain according to a certain rule; a second SOA optical switch 220 is arranged between an input end of the photodetector 500 and the third port of the circulator 200, and is configured to receive the regularly strained light wave signal returned by the optical fiber code 310; a main control module 600 electrically connected to the light source 100 and the photodetector 500 respectively for controlling the output of the light source 100, controlling the receiving of the photodetector 500, and identifying the regularly-strained light wave signals; the main control module 600 of the first transmission terminal and the second transmission terminal are respectively electrically connected with the signal generator 400 of the opposite side for editing the physical signals to be sent, and the signal generator 400 of the first transmission terminal and the second transmission terminal and the main control module 600 of the opposite side are located at the same position, namely, are far away from the main control module of the same transmission terminal through the communication optical fiber and are close to the main control module of the opposite side.
The circulator 200 is used to implement coupling of light waves, output input light waves to the optical fiber, and output reflected and scattered light waves in the optical fiber to the photodetector, and the signal generator 400 is used to generate a regular strain frequency sequence, when strain occurs, the wavelength of the light wave signals reflected and scattered by the optical fiber code will change along with the strain frequency.
The embodiment combines optical fiber sensing, an optical fiber coding technology and optical fiber communication, an information input end does not need to be accessed into an optical cable and only carries out strain excitation on the outer layer of the optical cable, pure physical two-way information transmission is realized through double optical fiber connection between two transmission terminals, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be completed can be avoided, especially, the condition that wireless or satellite return cannot be used for certain information acquisition is solved, the information transmission system of the optical fiber coding uses the optical cable to return to avoid illegal stealing, the unique identification characteristic and the sensing characteristic of the optical fiber coding are utilized, and the unique identification and stable signal transmission of a strain gauge are realized.
In some embodiments of the first aspect of the present invention, as shown in fig. 2, the signal generator 400 includes a fixing plate 410, and a power source 420, a control chip 430 and a strain gauge 440 disposed on the fixing plate 410, wherein the power source 420 supplies power to the control chip 430 and the strain gauge 440, the control chip 430 is electrically connected to the main control module 600 at the transmitting side for controlling the strain gauge 440 to output a physical signal according to a certain rule, and the fiber code 310 side of the communication fiber 300 is fixed (e.g., by glue or other fasteners) on the fixing plate 410 and in contact with the strain gauge 440. The control chip 430 controls the strain gauge 400 to strain according to a certain rule, strains according to a certain time rule, converts the rule into a corresponding long short message number or 0, 1 signal, and finally preferably selects the 0, 1 signal to convert the binary code into a strain signal in combination with the operability and convenience of the system.
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 (for example, the heater is not beneficial to heat dissipation control), and finally considering the use of an electromagnetic control vibrator; the single vibration has certain characteristics of the vibration waveform, but because the single vibration is influenced by factors such as interference, distance and the like, the accuracy rate is risky when an accurate characteristic point needs to be identified, but the scheme only identifies the vibration and continuous vibration time, and the method is easy to realize.
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 fiber code 310 from 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 fiber group.
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 one basic signal element, the duration of the basic signal element is T0, and the waiting time of two adjacent basic signal elements is n × T0, where n is a positive integer.
After each basic signal element is sent, the main control module can sense a strain point and strain starting and stopping time; when the signal generator sends the strain signal according to a certain time rule, the main control module can also sense the time rule, a basic signal element is 1, and n T0 intervals are 0, so that a binary sequence code can be formed, and the regular transmission of the signal is realized.
As shown in fig. 3, a bidirectional information transmission method based on optical fiber coding according to an embodiment of the second aspect of the present invention includes the following steps: controlling a light source to send a light wave signal; the light wave signal generates pulse light waves through the first SOA optical switch, and the pulse light waves enter the communication optical fiber through the circulator; the main control module at the transmitting side controls the signal generator to generate a physical signal and acts on the outer layer of the communication optical fiber at the position of the optical fiber code so as to enable the optical wave signal returned by the optical fiber code to be strained according to a certain rule; the photoelectric detector is controlled to receive the light wave signal returned by the circulator in the communication optical fiber through the switching time of the second SOA optical switch to generate pulse light waves which are strained according to rules; the photoelectric detector transmits the pulse light waves received by the photoelectric detector according to the rule strain to the main control module at the receiving side, and the main control module at the receiving side identifies the pulse light waves according to the rule strain. On the contrary, the main control module at the receiving side can also transmit signals through controlling the strain of the signal generator at the opposite side according to the requirement after identifying the information.
The bidirectional information transmission method based on the optical fiber coding according to the second embodiment of the invention has at least the following advantages: according to the scheme, optical fiber sensing, an optical fiber coding technology and optical fiber communication are combined, an information input end is not connected with an optical cable and only carries out strain excitation on the outer layer of the optical cable, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, especially for the condition that certain information collection cannot use wireless or satellite return transmission, the information transmission system of the optical fiber coding uses the optical cable to return and can avoid illegal stealing, and unique identification characteristics and sensing characteristics of the optical fiber coding are utilized, so that unique identification and stable signal transmission of a strain gauge are achieved.
The embodiment combines optical fiber sensing, an optical fiber coding technology and optical fiber communication, an information input end does not need to be accessed into an optical cable and only carries out strain excitation on the outer layer of the optical cable, pure physical two-way information transmission is realized through double optical fiber connection between two transmission terminals, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be completed can be avoided, especially, the condition that wireless or satellite return cannot be used for certain information acquisition is solved, the information transmission system of the optical fiber coding uses the optical cable to return to avoid illegal stealing, the unique identification characteristic and the sensing characteristic of the optical fiber coding are utilized, and the unique identification and stable signal transmission of a strain gauge are realized.
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 external environment (such as temperature, pressure, vibration, etc.), parameters such as intensity, phase, frequency, polarization state, etc. of the transmitted light in the optical fiber will change correspondingly.
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 L of the optical fiber code from the photodetector 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. The measurement accuracy l is the length of the fiber transmitted by the SOA switching pulse time T, and l is T c r/2.
In some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, the switching time difference (i.e. the time interval between the encoded wavelength changes of the optical fiber) of the vibration signal is a basic signal element, the duration of the basic signal element is T0, the photodetector will detect that the time of the continuous change of the encoded wavelength of the optical fiber is close to T0, so that the system recognizes a "1" symbol, and the waiting time of two adjacent basic signal elements is n T0, where n is a positive integer. N "0" symbols are identified, and combined to form the basic information binary sequence code.
After each basic signal element is sent, the main control module can sense a strain point and strain starting and stopping time; when the signal generator sends the strain signal according to a certain time rule, the main control module can also sense the time rule, a basic signal element is 1, and n T0 intervals are 0, so that a binary sequence code can be formed, and the regular transmission of the signal is realized.
The scheme belongs to the extension of strain information transmission, namely, unidirectional transmission, double optical fibers can realize information back-and-forth transmission, optical fiber coding regular strain vibration converts data information into vibration interval signals, the vibration signals cause the optical fiber coding to make corresponding wavelength changes, an opposite side monitoring station identifies the optical fiber coding wavelength changes and decodes corresponding signals, after the monitoring station receives the signals, the required replied information is edited into corresponding vibration signals to vibrate the optical fiber coding of the local side, and the opposite side receives the signals, so that one-receiving and one-sending bidirectional data transmission is realized; because the strain signal transmission based on the physical layer is adopted, the communication is more stable and reliable, the optical fiber transmission is adopted, the electromagnetic interference is avoided, the physical layer transmission is adopted, the network intrusion cannot be influenced, and the strain signal transmission is mainly suitable for the emergency situation that the data transmission speed and the data transmission quantity are not too large, and is an effective supplement to the traditional carrier communication after the failure.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A two-way information transmission system based on optical fiber coding comprises a first transmission terminal and a second transmission terminal, and is characterized in that:
the first transmission terminal and the second transmission terminal each include: a light source (100) for outputting a lightwave signal; a circulator (200), the circulator (200) having a first port, a second port, 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 with the second port of the circulator (200), and the other end of the communication optical fiber (300) is provided with an optical fiber code (310); the signal generator (400) is arranged on one side of the optical fiber code (310) on the communication optical fiber (300) and is used for generating a physical signal and acting on the outer layer of the communication optical fiber (300) so as to enable the optical wave signal returned by the optical fiber code (310) to generate strain according to a certain rule; a second SOA optical switch (220) is arranged between the input end of the photoelectric detector (500) and the third port of the circulator (200) and is used for receiving the regularly strained light wave signal returned by the optical fiber code (310); the main control module (600) is respectively and electrically connected with the light source (100) and the photoelectric detector (500) and is used for controlling the output of the light source (100), controlling the receiving of the photoelectric detector (500) and identifying the optical wave signals strained according to the rule;
the main control modules (600) of the first transmission terminal and the second transmission terminal are respectively electrically connected with the signal generator (400) of the other side to edit the physical signals required to be sent.
2. The optical fiber coding-based bidirectional information transmission system according to claim 1, wherein: signal generator (400) include fixed plate (410) and set up power (420), control chip (430), strainers (440) on fixed plate (410), power (420) do control chip (430) and strainers (440) power supply, control chip (430) and the master control module (600) electric connection of sending side are used for according to certain rule control strainers (440) output physical signal, one side of optical fiber code (310) on communication optical fiber (300) is fixed in on fixed plate (410) and with strainers (440) contact.
3. The optical fiber coding-based bidirectional information transmission system according to claim 2, wherein: the strain gauge (440) is an electromagnetic vibrator, a heater, or a stress generator.
4. The optical fiber coding-based bidirectional information transmission system according to claim 2, wherein: 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 of two adjacent basic signal elements is n T0, wherein n is a positive integer.
5. The optical fiber coding-based bidirectional information transmission system according to claim 1, wherein: 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, the length L of the optical fiber code (310) from the photoelectric detector (500) is n T c r/2, wherein n is a positive integer, c is the speed of light, and r is the refractive index of the optical fiber group.
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