CN111934772A - Optical fiber code identification system and method based on differential automatic noise elimination - Google Patents
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Abstract
The invention discloses an optical fiber code identification system and method based on differential automatic noise elimination, wherein the system comprises: the transmitting module comprises a wide-spectrum light source, a pulse light source, a first SOA optical switch and a first wavelength division multiplexer; a circulator; the optical splitter is provided with a main splitting end and an auxiliary splitting end, and the main splitting end is used for connecting optical fibers with optical fiber codes; a mirror; and the receiving module comprises a second wavelength division multiplexer, a photoelectric detector, a second SOA optical switch, a wavelength detector and a main controller. Coupling different wavelength bands of light waves through a wavelength division multiplexer, calculating the ratio Kn of the energy collected by a wavelength detector and the energy collected by a photoelectric detector by utilizing an optical splitter and a reflector, and taking the light wave energy collected by the photoelectric detector as background noise to carry out differential elimination by combining the characteristic that the photoelectric detector cannot identify the wavelength energy and can only identify narrow-spectrum pulse light waves so as to obtain the wavelength energy of optical fiber codes.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to an optical fiber code identification system and method based on differential automatic noise elimination.
Background
In the field of optical fiber communication, an optical fiber code consists of a plurality of optical fiber gratings with different wavelengths, and an optical fiber code identification system is an optical detection system for accurately identifying the wavelength and energy of the optical fiber gratings. Because the optical fiber code identification system depends on the detection of the control wavelength and energy of the optical switch on the receiving side, and the optical switch inevitably has noise mixed in, the energy of the optical fiber code wavelength identified by the system is not accurate enough.
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 optical fiber coding identification system based on differential automatic noise elimination, which can efficiently and accurately eliminate noise interference; the invention also provides a method for automatically eliminating noise based on difference for the optical fiber coding identification system.
According to the embodiment of the first aspect of the invention, the optical fiber code identification system based on differential automatic noise elimination comprises: the transmitting module comprises a wide-spectrum light source, a pulse light source, a first SOA optical switch and a first wavelength division multiplexer, wherein the wide-spectrum light source is connected with the first wavelength division multiplexer through the first SOA optical switch, the pulse light source is connected with the first wavelength division multiplexer, and the first wavelength division multiplexer is used for realizing coupling and wave combination of the wide-spectrum light source and the narrow-spectrum pulse light source; the circulator is provided with a first port, a second port and a third port, and the first port is connected with the output end of the first wavelength division multiplexer; the input end of the optical splitter is connected with the second port of the circulator, the optical splitter is provided with a main light splitting end and a secondary light splitting end, and the main light splitting end is used for connecting optical fibers with optical fiber codes; the reflecting mirror is connected with the secondary light splitting end of the light splitter; the receiving module comprises a second wavelength division multiplexer, a photoelectric detector, a second SOA optical switch and a wavelength detector, wherein the input end of the second wavelength division multiplexer is connected with the third port of the circulator and used for returning the wavelength division of the light wave, one output end of the second wavelength division multiplexer is connected with the photoelectric detector, and the other output end of the second wavelength division multiplexer is connected with the wavelength detector through the second SOA optical switch; and the main controller is electrically connected with the pulse light source, the first SOA optical switch, the photoelectric detector, the second SOA optical switch and the wavelength detector respectively.
The optical fiber code identification system based on differential automatic noise cancellation according to the first embodiment of the present invention has at least the following beneficial effects: coupling different wavelength bands of light waves through a wavelength division multiplexer, calculating the ratio Kn of the energy collected by a wavelength detector and the energy collected by a photoelectric detector by utilizing an optical splitter and a reflector, and taking the light wave energy collected by the photoelectric detector as background noise to carry out differential elimination by combining the characteristic that the photoelectric detector cannot identify the wavelength energy and can only identify narrow-spectrum pulse light waves so as to obtain the wavelength energy of optical fiber codes.
According to some embodiments of the first aspect of the present invention, the broad spectrum light source employs a wavelength band light source that is consistent with the wavelength band used for the fiber encoding.
According to some embodiments of the first aspect of the present invention, the splitting ratio of the primary splitting end to the secondary splitting end of the splitter is 99: 1.
According to some embodiments of the first aspect of the present invention, the wavelength detector employs a demodulator for achieving separation and wavelength measurement of the light waves.
According to some embodiments of the first aspect of the present invention, the master controller is an FPGA controller.
According to the second aspect of the invention, the method for automatically eliminating the noise of the optical fiber code identification system based on the difference comprises the following steps: the master controller synchronously controls the pulse light source and the first SOA optical switch to start, the first wavelength division multiplexer realizes the coupling and wave combination of the wide-spectrum light source and the narrow-spectrum pulse light source, and the coupling and wave combination is output to the circulator; the output of the circulator is coupled with the wave combiner and then is transmitted to the optical splitter, the optical splitter is utilized to divide the light wave output into two paths, one path of light wave is transmitted to the optical fiber with the optical fiber code, and the other path of light wave is transmitted to the reflector; the main controller synchronously controls the photoelectric detector and the second SOA optical switch to start at the time of T1, so that the wavelength detector and the photoelectric detector respectively collect the intensity of the light wave signals reflected by the reflector and feed back to the main controller, and the ratio Kn of the energy collected by the wavelength detector to the energy collected by the photoelectric detector is obtained by the main controller; and at the time of T2, the main controller synchronously controls the photoelectric detector and the second SOA optical switch to start, so that the wavelength detector and the photoelectric detector respectively collect the light wave energy reflected by the optical fiber codes and feed back the light wave energy to the main controller, and the main controller obtains the energy Pn (Pn-W) Kn/m of the wavelength Fn collected by the wavelength detector, wherein Pn is the original energy of the wavelength Fn collected by the wavelength detector, W is the original energy collected by the photoelectric detector, and m is the optical splitting coefficient output by the optical splitter to the optical fiber with the optical fiber codes.
The method for automatically eliminating the noise based on the difference of the optical fiber coding identification system according to the second embodiment of the invention has at least the following advantages: coupling different wavelength bands of light waves through a wavelength division multiplexer, calculating the ratio Kn of the energy collected by a wavelength detector and the energy collected by a photoelectric detector by utilizing an optical splitter and a reflector, and taking the light wave energy collected by the photoelectric detector as background noise to carry out differential elimination by combining the characteristic that the photoelectric detector cannot identify the wavelength energy and can only identify narrow-spectrum pulse light waves so as to obtain the wavelength energy of optical fiber codes.
According to some embodiments of the second aspect of the present invention, the T1 is a time required for the light wave to travel from the first SOA optical switch to the mirror and then to be reflected by the mirror to the second SOA optical switch.
According to some embodiments of the second aspect of the present invention, the T2 is a time required for the light wave to travel from the first SOA optical switch to the optical fiber code and then to be reflected by the optical fiber code to the second SOA optical switch.
According to some embodiments of the second aspect of the present invention, the wavelength detector at time T1 collects the light wave energy reflected by the mirror and includes fiber rayleigh backscatter energy, raman backscatter energy, and noise energy of the second SOA optical switch, and the photodetector at time T1 collects the light wave energy reflected by the mirror and includes fiber rayleigh backscatter energy, raman backscatter energy.
According to some embodiments of the second aspect of the present invention, the collecting of the optical wave energy reflected by the fiber code by the wavelength detector at time T2 includes optical fiber code wavelength energy, fiber rayleigh backscattering energy, raman backscattering energy and noise energy of the second SOA optical switch, and the collecting of the optical wave energy reflected by the mirror by the photodetector at time T2 includes fiber rayleigh backscattering energy, raman backscattering energy.
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 optical fiber encoding identification system according to an embodiment of the first aspect of the present invention;
FIG. 2 is a flowchart of a method for automatically eliminating noise based on difference for an optical fiber encoding identification system according to a second aspect of the present invention;
FIG. 3 is a spectral diagram of the energy collected by the wavelength detector at time T1 in accordance with an embodiment of the present invention;
fig. 4 is a spectrum diagram of the energy collected by the photodetector at time T1 according to the embodiment of the present invention.
Reference numerals:
the optical fiber module comprises a transmitting module 100, a wide spectrum light source 110, a pulse light source 120, a first SOA optical switch 130, and a first wavelength division multiplexer 140
A receiving module 700, a second wavelength division multiplexer 710, a photoelectric detector 720, a second SOA optical switch 730, a wavelength detector 740
A main controller 800.
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, an optical fiber coding identification system based on differential automatic noise cancellation according to an embodiment of a first aspect of the present disclosure includes:
the transmitting module 100, the transmitting module 100 includes a wide-spectrum light source 110, a pulsed light source 120, a first SOA optical switch 130, and a first wavelength division multiplexer 140, the wide-spectrum light source 110 is connected with the first wavelength division multiplexer 140 through the first SOA optical switch 130, the pulsed light source 120 is connected with the first wavelength division multiplexer 140, and the first wavelength division multiplexer 140 is used for realizing coupling and wave combination of the wide-spectrum light source and the narrow-spectrum pulsed light source;
a circulator 200, wherein the circulator 200 has a first port, a second port and a third port, and the first port is connected with the output end of the first wavelength division multiplexer 140;
the input end of the optical splitter 300 is connected with the second port of the circulator 200, the optical splitter 300 is provided with a main light splitting end and a secondary light splitting end, and the main light splitting end is used for connecting an optical fiber 500 with the optical fiber code 400; a reflecting mirror 600 connected to the sub-splitting end of the splitter 300;
the receiving module 700, the receiving module 700 includes a second wavelength division multiplexer 710, a photodetector 720, a second SOA optical switch 730, and a wavelength detector 740, an input end of the second wavelength division multiplexer 710 is connected to a third port of the circulator 200 and is used for backward wavelength division of the optical wave, one output end of the second wavelength division multiplexer 710 is connected to the photodetector 720, and the other output end is connected to the wavelength detector 740 through the second SOA optical switch 730; the main controller 800 is electrically connected to the pulsed light source 120, the first SOA optical switch 130, the photodetector 720, the second SOA optical switch 730, and the wavelength detector 740, respectively.
When the optical fiber coupler works, a wide-spectrum light source and a narrow-spectrum pulse light source of light waves with different wavelength bands are coupled through the first wavelength division multiplexer 140 and are transmitted to the optical splitter 300 and the reflector 400 through the first port and the second port of the circulator 200, the reflector 400 fully emits the coupled light waves of the branch in which the light waves are located according to the light splitting proportion, the wavelength detector 740 collects fiber Rayleigh backward scattering energy, Raman backward scattering energy and noise energy of a second SOA optical switch, the photodetector 720 collects the fiber Rayleigh backward scattering energy and Raman backward scattering energy, the ratio Kn of the energy collected by the wavelength detector and the energy collected by the photodetector is calculated, light wave signals reflected by the fiber code 400 are received according to time sequence control, the photodetector can not identify the wavelength energy but only can identify the characteristics of the narrow-spectrum pulse light waves, the light wave energy collected by the photodetector is used as background noise for differential elimination, the wavelength energy of the fiber code 400 can be derived.
The SOA optical switch has the functions of high-speed opening and closing and has the function of light wave amplification. The two SOAs form pulse control of sending and receiving light waves, so that the light waves are input into the optical fiber, the optical fiber is connected to reflect and scatter the light waves in a backward direction, and the light wave transmission distance is obtained by multiplying the opening and closing time difference between the two optical fibers by the light speed.
In some embodiments of the first aspect of the present invention, the fiber code 400 is a fiber code that is organized into distinct wavelengths according to a regular spacing, with different distinct wavelength fiber codes using different spacings and wavelengths. The broad spectrum light source 110 uses a wavelength band light source corresponding to the wavelength band used by the fiber code 400, so that the fiber code 400 reflects the light wave signal of the corresponding wavelength band.
In some embodiments of the first aspect of the present invention, the splitting ratio of the primary splitting end to the secondary splitting end of the splitter 300 is 99:1, and the splitter 300 achieves energy distribution of light waves, and considering that it is necessary to keep enough light intensity to achieve long-distance testing while the splitter is at the proximal end, it is calculated that the ratio of 99:1 splitter, 99% output into fiber 500, and 1% intensity output into mirror 600.
In some embodiments of the first aspect of the present invention, the wavelength detector 700 employs a demodulator for achieving separation and wavelength measurement of light waves.
In some embodiments of the first aspect of the present invention, the main controller 800 employs an FPGA controller.
As shown in fig. 2, a method for automatically eliminating noise based on difference for an optical fiber coding identification system according to a second embodiment of the present invention includes the following steps:
the master controller synchronously controls the pulse light source and the first SOA optical switch to start, the first wavelength division multiplexer realizes the coupling and wave combination of the wide-spectrum light source and the narrow-spectrum pulse light source, and the coupling and wave combination is output to the circulator;
the output of the circulator is coupled with the wave combiner and then is transmitted to the optical splitter, the optical splitter is utilized to divide the light wave output into two paths, one path of light wave is transmitted to the optical fiber with the optical fiber code, and the other path of light wave is transmitted to the reflector;
as shown in fig. 3 and 4, at time T1, the main controller synchronously controls the photodetector and the second SOA optical switch to start, so that the wavelength detector and the photodetector respectively collect the intensity of the light wave signal reflected by the mirror and feed back the intensity to the main controller, and the main controller obtains the ratio Kn between the energy collected by the wavelength detector and the energy collected by the photodetector;
at time T2, the main controller synchronously controls the photodetector and the second SOA optical switch to start, so that the wavelength detector and the photodetector respectively collect the light wave energy reflected by the optical fiber code and feed back the light wave energy to the main controller, and the main controller obtains the energy Pn of the wavelength Fn collected by the wavelength detector (Pn-W Kn)/m, where Pn is the original energy of the wavelength Fn collected by the wavelength detector, W is the original energy collected by the photodetector, m is the splitting coefficient output by the splitter to the optical fiber with the optical fiber code, and m in this embodiment is 99%.
Coupling different wavelength bands of light waves through a wavelength division multiplexer, calculating the ratio Kn of the energy collected by a wavelength detector and the energy collected by a photoelectric detector by utilizing an optical splitter and a reflector, and taking the light wave energy collected by the photoelectric detector as background noise to carry out differential elimination by combining the characteristic that the photoelectric detector cannot identify the wavelength energy and can only identify narrow-spectrum pulse light waves so as to obtain the wavelength energy of optical fiber codes.
In some embodiments of the second aspect of the present invention, the T1 is the time required for a light wave to travel from the first SOA optical switch to the mirror and then to be reflected by the mirror to the second SOA optical switch. The interval time T1 can be controlled by the main controller controlling the on-time difference between the first SOA optical switch and the second SOA optical switch.
In some embodiments of the second aspect of the present invention, the T2 is the time required for the light wave to travel from the first SOA optical switch to the fiber code and then to be reflected by the fiber code to the second SOA optical switch. The interval time T2 can be controlled by the main controller controlling the on-time difference between the first SOA optical switch and the second SOA optical switch.
In some embodiments of the second aspect of the present invention, the wavelength detector at time T1 collects the light wave energy reflected by the mirror and includes fiber rayleigh backscattered energy, raman backscattered energy and noise energy of the second SOA optical switch, and the photodetector at time T1 collects the light wave energy reflected by the mirror and includes fiber rayleigh backscattered energy, raman backscattered energy.
In some embodiments of the second aspect of the present invention, the wavelength detector at time T2 collects the light wave energy reflected by the fiber code, and includes fiber code wavelength energy, fiber rayleigh backscattering energy, raman backscattering energy, and noise energy of the second SOA optical switch, and the photodetector at time T2 collects the light wave energy reflected by the mirror, and includes fiber rayleigh backscattering energy, raman backscattering energy.
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 (10)
1. An optical fiber coding identification system based on differential automatic noise elimination is characterized in that: comprises that
The transmission module (100) comprises a wide-spectrum light source (110), a pulsed light source (120), a first SOA optical switch (130) and a first wavelength division multiplexer (140), wherein the wide-spectrum light source (110) is connected with the first wavelength division multiplexer (140) through the first SOA optical switch (130), the pulsed light source (120) is connected with the first wavelength division multiplexer (140), and the first wavelength division multiplexer (140) is used for realizing the coupling wave combination of the wide-spectrum light source and the narrow-spectrum pulsed light source;
a circulator (200), wherein the circulator (200) is provided with a first port, a second port and a third port, and the first port is connected with the output end of the first wavelength division multiplexer (140);
an optical splitter (300), an input end of the optical splitter (300) is connected with the second port of the circulator (200), the optical splitter (300) is provided with a main splitting end and a secondary splitting end, and the main splitting end is used for connecting an optical fiber (500) with an optical fiber code (400);
a reflector (600) connected to the secondary splitting end of the splitter (300);
a receiving module (700), wherein the receiving module (700) comprises a second wavelength division multiplexer (710), a photodetector (720), a second SOA optical switch (730) and a wavelength detector (740), an input end of the second wavelength division multiplexer (710) is connected with a third port of the circulator (200) and is used for backward wave division of the light wave, one output end of the second wavelength division multiplexer (710) is connected with the photodetector (720), and the other output end of the second wavelength division multiplexer is connected with the wavelength detector (740) through the second SOA optical switch (730);
and the main controller (800) is respectively electrically connected with the pulse light source (120), the first SOA optical switch (130), the photoelectric detector (720), the second SOA optical switch (730) and the wavelength detector (740).
2. The differential automatic noise cancellation-based optical fiber coding identification system according to claim 1, wherein: the broad spectrum light source (110) employs a wavelength band light source that is consistent with the wavelength band used by the fiber optic code (400).
3. The differential automatic noise cancellation-based optical fiber coding identification system according to claim 1, wherein: the light splitting ratio of the main light splitting end and the auxiliary light splitting end of the light splitter (300) is 99: 1.
4. The differential automatic noise cancellation-based optical fiber coding identification system according to claim 1, wherein: the wavelength detector (700) adopts a demodulator for realizing the separation of light waves and the wavelength measurement.
5. The differential automatic noise cancellation-based optical fiber coding identification system according to claim 1, wherein: the main controller (800) adopts an FPGA controller.
6. A method for automatically eliminating noise of an optical fiber coding identification system based on difference is characterized in that: comprises the following steps
The master controller synchronously controls the pulse light source and the first SOA optical switch to start, the first wavelength division multiplexer realizes the coupling and wave combination of the wide-spectrum light source and the narrow-spectrum pulse light source, and the coupling and wave combination is output to the circulator;
the output of the circulator is coupled with the wave combiner and then is transmitted to the optical splitter, the optical splitter is utilized to divide the light wave output into two paths, one path of light wave is transmitted to the optical fiber with the optical fiber code, and the other path of light wave is transmitted to the reflector;
the main controller synchronously controls the photoelectric detector and the second SOA optical switch to start at the time of T1, so that the wavelength detector and the photoelectric detector respectively collect the intensity of the light wave signals reflected by the reflector and feed back to the main controller, and the ratio Kn of the energy collected by the wavelength detector to the energy collected by the photoelectric detector is obtained by the main controller;
and at the time of T2, the main controller synchronously controls the photoelectric detector and the second SOA optical switch to start, so that the wavelength detector and the photoelectric detector respectively collect the light wave energy reflected by the optical fiber codes and feed back the light wave energy to the main controller, and the main controller obtains the energy Pn (Pn-W) Kn/m of the wavelength Fn collected by the wavelength detector, wherein Pn is the original energy of the wavelength Fn collected by the wavelength detector, W is the original energy collected by the photoelectric detector, and m is the optical splitting coefficient output by the optical splitter to the optical fiber with the optical fiber codes.
7. The method for automatically eliminating noise based on difference for fiber coding recognition system according to claim 6, wherein: the T1 is the time required for the light wave to travel from the first SOA optical switch to the mirror and then to be reflected by the mirror to the second SOA optical switch.
8. The method for automatically eliminating noise based on difference for fiber coding recognition system according to claim 6, wherein: the T2 is the time required for the light wave to travel from the first SOA optical switch to the fiber code and then to be reflected by the fiber code to the second SOA optical switch.
9. The method for automatically eliminating noise based on difference for fiber coding recognition system according to claim 6, wherein: the wavelength detector at the time of T1 collects the light wave energy reflected by the reflector, including fiber rayleigh backscattered energy, raman backscattered energy and noise energy of the second SOA optical switch, and the photodetector at the time of T1 collects the light wave energy reflected by the reflector, including fiber rayleigh backscattered energy, raman backscattered energy.
10. The method for automatically eliminating noise based on difference for fiber coding recognition system according to claim 6, wherein: the wavelength detector at the time of T2 collects the light wave energy reflected by the fiber code, including fiber code wavelength energy, fiber rayleigh backscattering energy, raman backscattering energy and noise energy of the second SOA optical switch, and the photodetector at the time of T2 collects the light wave energy reflected by the mirror, including fiber rayleigh backscattering energy and raman backscattering energy.
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