阅读说明：本技术 一种基于分布式传感的信息传输系统及方法 (Information transmission system and method based on distributed sensing ) 是由 朱惠君 薛鹏 白金刚 毛志松 邬耀华 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种基于分布式传感的信息传输系统及方法,系统包括：脉冲光源、环形器、信号发生器,用于生成物理信号并作用于通信光纤的外层以使光波信号按一定规则发生应变；光电探测器,用于接收通信光纤回传的按规则应变的光波信号；主控模块,用于控制脉冲光源的输出、控制光电探测器的接收以及识别按规则应变的光波信号。本方案将分布式传感技术于光纤通信相结合,信息输入端不用接入光缆而只在光缆外层进行应变激励,可避免现有传输设备被入侵后就失去效果进而导致通信无法完成的效果,尤其是针对某些信息采集不能使用无线或者卫星回传的情况,分布式传感的信息传输系统使用光缆自身回传可避免非法窃取。(The invention discloses an information transmission system and method based on distributed sensing, wherein the system comprises: the device comprises a pulse light source, a circulator and a signal generator, wherein the pulse light source is used for generating a physical signal and acting on the outer layer of the communication optical fiber so as to enable the light wave signal to generate strain according to a certain rule; the photoelectric detector is used for receiving the regularly-strained light wave signals returned by the communication optical fiber; and the main control module is used for controlling the output of the pulse light source, controlling the receiving of the photoelectric detector and identifying the light wave signal which is strained according to the rule. The scheme combines the distributed sensing technology with optical fiber communication, the 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, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.)

1. An information transmission system based on distributed sensing, comprising:

a pulsed light source (100) for outputting a lightwave signal;

a circulator (200), the circulator (200) having a first port, a second port, a third port; the first port of the circulator (200) is connected with the output end of the pulse light source (100);

a communication fiber (300), an input end of the communication fiber (300) being connected with a second port of the circulator (200);

the signal generator (400) is arranged on one side of the communication optical fiber (300) far away from the circulator (200) 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 light wave signal to be strained according to a certain rule;

the input end of the photoelectric detector (500) is connected with the third port of the circulator (200) and is used for receiving the regularly strained light wave signal transmitted back by the communication optical fiber (300);

the main control module (600) is respectively and electrically connected with the pulse light source (100) and the photoelectric detector (500) and is used for controlling the output of the pulse light source (100), controlling the receiving of the photoelectric detector (500) and identifying the regularly strained light wave signals.

2. The distributed sensing-based information transmission system according to claim 1, wherein: the signal generator (400) comprises a fixing plate (410), a power source (420), a control chip (430) and a strain gauge (440), wherein the power source (420) is arranged on the fixing plate (410), the control chip (430) and the strain gauge (440) are powered by the power source (420), the control chip (440) is used for controlling the strain gauge (440) to output a physical signal according to a certain rule, and one side of the communication optical fiber (300) is fixed on the fixing plate (410) and is in contact with the strain gauge (440).

3. The distributed sensing-based information transmission system according to claim 2, wherein: the strain gauge (440) is an electromagnetic vibrator, a heater, or a stress generator.

4. The distributed sensing-based information transmission system according to claim 2, wherein: the communication fiber (300) has an extended fiber loop (450) on the fixing plate (410), and the minimum fiber length L0 ═ T ═ c ×, r of the extended fiber loop (450), where T is the maximum pulse time of the pulsed light source (100), c is the speed of light, and r is the fiber group refractive index.

5. The distributed sensing-based 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, the waiting time of two adjacent basic signal elements is n T0, T0 is greater than (LL/(c r)). times.2, wherein n is a positive integer, LL is the set length of the optical fiber in contact with the strain gauge (440), c is the speed of light, and r is the refractive index of the optical fiber group.

6. An information transmission method based on distributed sensing is characterized in that: the method comprises the following steps of controlling a pulse light source to send pulse light waves, and enabling the pulse light waves to enter a communication optical fiber through a circulator;

generating a physical signal and acting on the outer layer of the communication optical fiber at a specific position so as to enable the pulse light wave to generate strain according to a certain rule;

receiving pulse light waves which are returned by the circulator in the communication optical fiber and are in strain according to rules by using a photoelectric detector;

the photoelectric detector transmits the pulse light waves received by the photoelectric detector according to the rule strain to the main control module, and the main control module identifies the pulse light waves according to the rule strain.

7. The information transmission method based on distributed sensing of claim 6, wherein: the physical signal is a vibration signal, a temperature signal or a stress signal.

8. The information transmission method based on distributed sensing of claim 6, wherein: the specific position of the outer layer of the communication optical fiber acted by the physical signal is determined by the difference between the sending time of the pulse light source and the receiving time of the photoelectric detector.

9. The information transmission method based on distributed sensing of claim 6, wherein: the rear end of the specific position where the communication optical fiber is strained is provided with an extended optical fiber ring, the minimum length L0 of the optical fiber of the extended optical fiber ring is T c r, wherein T is the maximum pulse time of the pulse light source, c is the light speed, and r is the refractive index of the optical fiber group.

10. The information transmission method based on distributed sensing of claim 6, wherein: 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, the waiting time of two adjacent basic signal elements is n T0, T0 is greater than (LL/(c r)). times.2, wherein n is a positive integer, LL is the set length of the optical fiber between the action position of the vibration signal and the circulator, c is the speed of light, and r is the refractive index of the optical fiber group.

Technical Field

The invention relates to the field of optical fiber communication, in particular to an information transmission system and method based on distributed sensing.

Background

The existing optical fiber communication system mainly depends on the sending and receiving of bidirectional light waves, depends on a large number of chips for signal transmission, and cannot carry out effective signal transmission under special conditions (such as the situations that wireless signals cannot be used, optical fiber transmission equipment is invaded, long-distance physical media are needed for transmitting information, and the like).

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an information transmission system based on distributed sensing, which can adapt to information transmission under special conditions; the invention also provides an information transmission method based on distributed sensing.

An information transmission system based on distributed sensing according to an embodiment of a first aspect of the present invention includes: the pulse light source is used for outputting a light wave signal; a circulator having a first port, a second port, and a third port; the first port of the circulator is connected with the output end of the pulse light source; the input end of the communication optical fiber is connected with the second port of the circulator; the signal generator is arranged on one side of the communication optical fiber far away from the circulator and used for generating a physical signal and acting on the outer layer of the communication optical fiber so as to enable the light wave signal to be strained according to a certain rule; the input end of the photoelectric detector is connected with the third port of the circulator and is used for receiving the regularly strained light wave signal returned by the communication optical fiber; and the main control module is respectively and electrically connected with the pulse light source and the photoelectric detector and is used for controlling the output of the pulse light source, controlling the receiving of the photoelectric detector and identifying the optical wave signals which are strained according to rules.

The information transmission system based on distributed sensing according to the first embodiment of the invention has at least the following beneficial effects: the scheme combines the distributed sensing technology with optical fiber communication, the 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, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.

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 supplying power to the control chip and the strain gauge, the control chip being configured to control the strain gauge to output a physical signal according to a certain rule, and one side of the communication fiber being fixed to the fixing plate and contacting 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 communication fiber has an extended fiber loop on the fixing plate, the extended fiber loop having a minimum fiber length L0 ═ T × c × r, where T is a maximum pulse time of the pulsed light source, c is a speed of light, and r is a fiber group refractive index.

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 base signal element, the duration of the base signal element is T0, the waiting time of two adjacent base signal elements is n × T0, and T0 is greater than (LL/(c × r)) × 2, where n is a positive integer, LL is the set length of the optical fiber in contact with the strain gauge, 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 information transmission method based on distributed sensing comprises the following steps: controlling a pulse light source to send pulse light waves, wherein the pulse light waves enter a communication optical fiber through a circulator; generating a physical signal and acting on the outer layer of the communication optical fiber at a specific position so as to enable the pulse light wave to generate strain according to a certain rule; receiving pulse light waves which are returned by the circulator in the communication optical fiber and are in strain according to rules by using a photoelectric detector; the photoelectric detector transmits the pulse light waves received by the photoelectric detector according to the rule strain to the main control module, and the main control module identifies the pulse light waves according to the rule strain.

The information transmission method based on distributed sensing according to the second embodiment of the present invention has at least the following advantages: the scheme combines the distributed sensing technology with optical fiber communication, the 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, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.

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 specific location of the outer layer of the optical communication fiber on which the physical signal is applied is determined by a difference between a transmission time of the pulsed light source and a reception time of the photodetector.

According to some embodiments of the second aspect of the present invention, the back end of the specific location where the communication fiber is strained has an extended fiber loop, the minimum length of the fiber of the extended fiber loop is L0 ═ T × c × r, where T is the maximum pulse time of the pulsed light source, 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, the waiting time of two adjacent basic signal elements is n × T0, T0 is greater than (LL/(c × r)). 2, where n is a positive integer, LL is the set length of the optical fiber between the vibration signal application position and the circulator, c is the optical speed, and r is the refractive index of the optical fiber group.

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 an 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 waveform of the return pulse in an unstrained state in accordance with an embodiment of the present invention;

FIG. 4 is a waveform of a return pulse under strain according to an embodiment of the first aspect of the present invention;

fig. 5 is a flowchart of an information transmission method according to a second aspect of the present invention.

Reference numerals:

the device comprises a pulse light source 100, a circulator 200, a communication optical fiber 300, a signal generator 400, a fixing plate 410, a power supply 420, a control chip 430, a strain gauge 440, an extension optical fiber ring 450, 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.