CN112653509A - Multi-wavelength polling optical fiber code identification system and method - Google Patents
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Abstract
本发明公开了一种多波长轮巡的光纤编码识别系统及方法，系统包括：大功率脉冲光源组，由多个不同波长段的大功率脉冲光源组成；波分复用器；环形器；光纤，所述光纤上设置有光纤编码；APD光电采集器；AD采集卡；主控制器，分别与所述大功率脉冲光源组、APD光电采集器、AD采集卡电性连接，用于控制所述大功率脉冲光源组的各个大功率脉冲光源轮巡发光以实现光纤编码的识别。本实施例利用不同中心波长的多个大功率脉冲光源逐个轮巡发光，配合APD光电采集器与AD采集卡组成的快速识别模块，采集频率为传统波长探测器的40倍以上，且能一次完成单个中心波长的光源在光纤链路全程的反射信号采集，在成本更低的条件下实现光纤编码的更快识别。
The present invention discloses a multi-wavelength patrol fiber coding identification system and method, the system includes: a high-power pulse light source group, composed of a plurality of high-power pulse light sources in different wavelength bands; a wavelength division multiplexer; a circulator; an optical fiber, on which an optical fiber coding is arranged; an APD photoelectric collector; an AD acquisition card; and a main controller, which is electrically connected to the high-power pulse light source group, the APD photoelectric collector, and the AD acquisition card, respectively, and is used to control the patrol emission of each high-power pulse light source of the high-power pulse light source group to realize the identification of the fiber coding. This embodiment utilizes a plurality of high-power pulse light sources with different central wavelengths to patrol and emit light one by one, and cooperates with a fast identification module composed of an APD photoelectric collector and an AD acquisition card, the acquisition frequency is more than 40 times that of a traditional wavelength detector, and can complete the reflection signal acquisition of a single central wavelength light source in the entire optical fiber link at one time, and realizes faster identification of the fiber coding at a lower cost.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a multi-wavelength polling optical fiber code identification system and a multi-wavelength polling optical fiber code identification method.
Background
In the field of optical fiber communication, an optical fiber coding is used as a technical means for unique identification of an optical fiber medium and consists of a plurality of optical fiber gratings with different wavelengths, and an optical fiber coding identification system is an optical detection system for accurately identifying the wavelengths of the optical fiber gratings. The existing optical fiber coding and identifying system mainly uses a wavelength detector (AD acquisition card), and has high cost and long single acquisition time.
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 multi-wavelength polling optical fiber code identification system and method, which can realize low-cost rapid acquisition of reflection signals and optical fiber code identification.
According to the embodiment of the first aspect of the invention, the system for identifying the optical fiber code of the multi-wavelength polling comprises the following components: the high-power pulse light source group consists of a plurality of high-power pulse light sources with different wavelength bands; the input end of the wavelength division multiplexer is respectively connected with the high-power pulse light sources with different wavelength bands so as to realize the wavelength coupling of the high-power pulse light source group; 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 wavelength division multiplexer; the input end of the optical fiber is connected with the second port of the circulator, and the optical fiber is provided with an optical fiber code; the APD photoelectric collector is connected with a third port of the circulator to receive the light wave signal returned by the optical fiber code and convert the light wave signal into a level signal; the AD acquisition card is connected with the output end of the APD photoelectric collector and is used for converting the level signal of the APD photoelectric collector into a digital signal and feeding the digital signal back to the main controller; and the main controller is respectively electrically connected with the high-power pulse light source group, the APD photoelectric collector and the AD acquisition card and is used for controlling each high-power pulse light source of the high-power pulse light source group to emit light in turn so as to realize identification of optical fiber codes.
The multi-wavelength polling optical fiber code identification system according to the first embodiment of the invention has at least the following beneficial effects: in the embodiment, a plurality of high-power pulse light sources with different central wavelengths are used for making rounds of inspection and light emission one by one, and a rapid identification module consisting of an APD photoelectric collector and an AD acquisition card is matched, so that the acquisition frequency is more than 40 times that of a traditional wavelength detector, the reflected signal acquisition of the light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the rapid identification of optical fiber codes is realized under the condition of lower cost.
According to some embodiments of the first aspect of the present invention, the system for identifying an optical fiber code of a multi-wavelength polling further includes an amplifier disposed between the APD photo collector and the AD acquisition card.
According to some embodiments of the first aspect of the present invention, the high power pulsed light source group employs DFB lasers.
According to some embodiments of the first aspect of the present invention, the master controller employs an FPGA.
According to the second aspect of the invention, the method for identifying the optical fiber code of the multi-wavelength polling comprises the following steps: outputting a pulse driving command to a first high-power pulse light source of the high-power pulse light source group by the main controller, wherein the starting time is t0, and the pulse width is t; each high-power pulse light source adopts a central wavelength with different sizes and respectively corresponds to different code elements of optical fiber codes; the first high-power pulse light source outputs a pulse light wave with a central wavelength to the wavelength division multiplexer, the circulator and the optical fiber to be detected containing the optical fiber code; the master controller controls the APD photoelectric collector to start to receive the reflected light wave signals and convert the reflected light wave signals into analog level signals, the starting time is t0, and the reflected light wave signal wavelength and energy collection of the pulse light waves with single central wavelength in the whole process of the optical fiber to be detected is realized; converting the analog level signal acquired by the APD photoelectric acquisition unit into a digital signal by using an AD acquisition card and feeding the digital signal back to the main controller; the main controller calculates the energy value of each point in the optical fiber and the optical fiber coding reflection wavelength corresponding to the first high-power pulse light source according to the acquired digital signals; and sequentially controlling the rest high-power pulse light sources to emit light one by one, and repeating the steps to collect the wavelengths and the energies corresponding to different code elements, thereby realizing the complete identification of the optical fiber codes.
The method for identifying the optical fiber codes of the multi-wavelength polling according to the embodiment of the second aspect of the invention has at least the following beneficial effects: in the embodiment, a plurality of high-power pulse light sources with different central wavelengths are used for making rounds of inspection and light emission one by one, and a rapid identification module consisting of an APD photoelectric collector and an AD acquisition card is matched, so that the acquisition frequency is more than 40 times that of a traditional wavelength detector, the reflected signal acquisition of the light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the rapid identification of optical fiber codes is realized under the condition of lower cost.
According to some embodiments of the second aspect of the present invention, the set of high power pulsed light sources is composed of a plurality of high power pulsed light sources, each of the high power pulsed light sources having a spectrum with a center wavelength of ± 0.5 nm.
According to some embodiments of the second aspect of the present invention, the pulse width t ═ k × t00, where t00 is the reference pulse width and k is a specified coefficient associated with the measured maximum distance.
According to some embodiments of the second aspect of the present invention, the APD photo-harvester has an acquisition time interval t11, and each acquisition point has an acquisition time m × t11, m being an acquisition point number, where t11 ═ t00 × k.
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 present invention;
fig. 2 is a flowchart of an optical fiber code identification method according to an embodiment of the present invention.
Reference numerals:
the device comprises a high-power pulse light source group 100, a wavelength division multiplexer 200, a circulator 300, an optical fiber 400, an optical fiber code 410, an APD photoelectric collector 500, an AD acquisition card 600, a main controller 700 and an amplifier 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 code identification system for multi-wavelength polling according to an embodiment of the present invention includes: the high-power pulse light source group 100 consists of a plurality of high-power pulse light sources with different wavelength bands; the input end of the wavelength division multiplexer 200 is respectively connected with the plurality of high-power pulse light sources with different wavelength bands to realize the wavelength coupling of the high-power pulse light source group 100; a circulator 300, wherein the circulator 300 has a first port, a second port and a third port, and the first port is connected with the output end of the wavelength division multiplexer 200; the input end of the optical fiber 400 is connected with the second port of the circulator 300, and the optical fiber 400 is provided with an optical fiber code 410; the APD photoelectric collector 500 is connected to the third port of the circulator 300 to receive the optical wave signal transmitted back by the optical fiber code 410 and convert the optical wave signal into a level signal; the AD acquisition card 600 is connected with the output end of the APD photoelectric collector 500 and is used for converting the level signal of the APD photoelectric collector 500 into a digital signal and feeding the digital signal back to the main controller 700; and the main controller 700 is electrically connected with the high-power pulse light source group 100, the APD photoelectric collector 500 and the AD acquisition card 600 respectively, and is used for controlling each high-power pulse light source of the high-power pulse light source group 100 to emit light in turn so as to realize identification of the optical fiber codes 410.
The working process is that the main controller 700 controls one of the high-power pulse light sources of the high-power pulse light source group 100 to output a high-power pulse light wave signal with a single central wavelength, the APD photoelectric collector 500 is started simultaneously, the high-power pulse light wave signal enters the wavelength coupling of the wavelength division multiplexer 200, enters through the first port of the circulator 300, is output to the optical fiber code 410 on the optical fiber 400 through the second port of the circulator 300, is subjected to photoelectric conversion to the APD photoelectric collector 500 through the second port of the circulator 300 and the third port of the circulator 300 in sequence, is converted into a digital signal through the AD acquisition card 600, and is fed back to the main controller 700 to identify the code element wavelength and energy of the optical fiber code 400 corresponding to the single central wavelength, and then sequentially scans different high-power pulse light sources to output high-power pulse light wave signals with different central wavelengths, the other symbol wavelengths and energies of the light code 400 are identified to form a complete light code.
Because the acquisition frequency of the existing wavelength detector (wavelength demodulator) can only reach 10MHz at most, and a SOA optical switch is needed to realize the pulse control of the received light wave, and because the acquisition rate of the wavelength detector is not enough, the light source can only acquire a small segment of optical fiber once when emitting light, and the acquisition of the whole optical fiber link can be completed only by multiple times of light emission and acquisition, so that the identification efficiency of the whole optical fiber code is low. In the embodiment, a plurality of high-power pulse light sources with different central wavelengths are used for sequentially emitting light, the highest frequency of the high-power pulse light sources can reach 10GHz (400 MHz is selected for saving cost) by matching with a quick identification module consisting of an APD photoelectric collector and an AD acquisition card, the acquisition frequency is more than 40 times of that of a traditional wavelength detector, the reflected signal acquisition of the light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the optical fiber codes can be identified more quickly under the condition of lower cost.
In some embodiments of the first aspect of the present invention, the optical fiber code identification system for multi-wavelength polling further includes an amplifier 800 disposed between the APD photoelectric collector 500 and the AD acquisition card 600, so as to amplify the level signal of the APD photoelectric collector, and improve the detection distance.
In view of the volume and performance requirements, in some embodiments of the first aspect of the present invention, the high power pulsed light source group 100 employs DFB lasers.
In some embodiments of the first aspect of the present invention, the main controller 700 employs an FPGA. On one hand, the round training pulse driving and the power control of the high-power pulse light source are realized, and on the other hand, the data acquisition of an AD acquisition module is realized; the length of the optical fiber of the collection point can be calculated by only the difference between the light-emitting time of the high-power pulse light source and the time of the collection point of the APD photoelectric collector 500; the FPGA main control module calculates the voltage and current required by the light intensity of the light source and the required pulse time, supplies power to the light source, the light source emits light and then inputs the light into an optical fiber code through a wavelength division multiplexer, a circulator and an optical fiber, backward reflected light in the optical fiber enters an APD photoelectric collector through the circulator to be converted into an analog electric signal, the analog electric signal is amplified by an amplifier and then is input into an AD acquisition module, the AD acquisition module continuously acquires the data information of the AD acquisition module according to the acquisition frequency, the FPGA main control module starts to acquire the data information of the AD acquisition module after driving the light source, the data information comprises energy and time, so that the light emission and the acquisition of the wavelength of a single light source are completed, and the FPGA main control module calculates the energy value of each point in the; the optical fiber codes corresponding to the central wavelengths are collected after the light sources with different central wavelengths are output, and the optical fiber codes are combined by using the current positions of the distances of the optical fiber codes, so that the complete collection of the optical fiber codes is realized.
As shown in fig. 2, a method for identifying an optical fiber code of a multi-wavelength polling according to a second embodiment of the present invention includes the following steps:
outputting a pulse driving command to a first high-power pulse light source of the high-power pulse light source group by the main controller, wherein the starting time is t0, and the pulse width is t; each high-power pulse light source adopts a central wavelength with different sizes and respectively corresponds to different code elements of optical fiber codes;
the first high-power pulse light source outputs a pulse light wave with a central wavelength to the wavelength division multiplexer, the circulator and the optical fiber to be detected containing the optical fiber code;
the master controller controls the APD photoelectric collector to start to receive the reflected light wave signals and convert the reflected light wave signals into analog level signals, the starting time is t0, and the reflected light wave signal wavelength and energy collection of the pulse light waves with single central wavelength in the whole process of the optical fiber to be detected is realized;
converting the analog level signal acquired by the APD photoelectric acquisition unit into a digital signal by using an AD acquisition card and feeding the digital signal back to the main controller;
the main controller calculates the energy value of each point in the optical fiber and the optical fiber coding reflection wavelength corresponding to the first high-power pulse light source according to the acquired digital signals;
and sequentially controlling the rest high-power pulse light sources to emit light one by one, and repeating the steps to collect the wavelengths and the energies corresponding to different code elements, thereby realizing the complete identification of the optical fiber codes.
In the embodiment, a plurality of high-power pulse light sources with different central wavelengths are used for making rounds of inspection and light emission one by one, and a rapid identification module consisting of an APD photoelectric collector and an AD acquisition card is matched, so that the acquisition frequency is more than 40 times that of a traditional wavelength detector, the reflected signal acquisition of the light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the rapid identification of optical fiber codes is realized under the condition of lower cost.
In some embodiments of the second aspect of the present invention, the high power pulsed light source group is composed of a plurality of high power pulsed light sources, each of the high power pulsed light sources has a spectrum with a central wavelength of ± 0.5nm, and the central wavelength interval between two adjacent high power pulsed light sources is 1 nm; the LED lamp is directly controlled by the FPGA main control module to emit light by light intensity and pulse modulation one by one.
In some embodiments of the second aspect of the present invention, the pulse width t ═ k × t00, where t00 is the reference pulse width and k is a specified coefficient associated with the measured maximum distance.
In some embodiments of the second aspect of the present invention, the acquisition time interval of the APD photo-collector is t11, the acquisition time of each acquisition point is m × t11, m is the serial number of the acquisition point, where t11 ═ t00 × k, where t11 directly affects the acquisition accuracy, and the smaller the value, the higher the acquisition accuracy.
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.
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