A multi-wavelength patrol optical fiber coding identification system and method

Abstract

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 each high-power pulse light source of the high-power pulse light source group to patrol and emit light 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 collection frequency is more than 40 times that of a traditional wavelength detector, and can complete the reflection signal collection 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

[0001] The present invention relates to the field of optical fiber communication, and in particular to a multi-wavelength patrol optical fiber coding identification system and method. Background Art

[0002] In the field of optical fiber communication, optical fiber coding is a technical means of uniquely identifying optical fiber media. It is composed of multiple optical fiber Bragg gratings of different wavelengths. The optical fiber coding identification system is an optical detection system that accurately identifies the wavelength of its optical fiber Bragg grating. The existing optical fiber coding identification system mainly uses wavelength detectors (AD acquisition cards), which are expensive and take a long time to collect data at a time. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multi-wavelength patrol fiber coding identification system and method, which can realize low-cost and fast collection of reflection signals and fiber coding identification.

[0004] According to the first aspect of the present invention, a multi-wavelength patrol fiber coding identification system includes: a high-power pulse light source group, which is composed of a plurality of high-power pulse light sources in different wavelength bands; a wavelength division multiplexer, whose input ends are respectively connected to the plurality of high-power pulse light sources in different wavelength bands to realize wavelength coupling of the high-power pulse light source group; a circulator, the circulator having a first port, a second port, and a third port, the first port being connected to the output end of the wavelength division multiplexer; an optical fiber, the optical fiber input end being connected to the second port of the circulator, and the optical fiber being provided with optical fiber coding; an APD photoelectric collector, connected to the third port of the circulator to receive the optical wave signal returned by the optical fiber coding and convert it into a level signal; an AD acquisition card, connected to the output end of the APD photoelectric collector to convert the level signal of the APD photoelectric collector into a digital signal and feed it back to a main controller; a main controller, which is respectively electrically connected to the high-power pulse light source group, the APD photoelectric collector, and the AD acquisition card, and is used to control the patrol light emission of each high-power pulse light source of the high-power pulse light source group to realize the identification of the optical fiber coding.

[0005] The multi-wavelength patrol fiber optic coding identification system according to the first embodiment of the present invention has at least the following beneficial effects: this embodiment utilizes multiple high-power pulse light sources with different central wavelengths to emit light one by one in a patrol manner, 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 the reflection signal acquisition of a single central wavelength light source in the entire optical fiber link can be completed at one time, thereby realizing faster identification of optical fiber coding at a lower cost.

[0006] According to some embodiments of the first aspect of the present invention, the multi-wavelength patrol fiber coding identification system further includes an amplifier arranged between the APD photoelectric collector and the AD acquisition card.

[0007] According to some embodiments of the first aspect of the present invention, the high-power pulse light source group uses a DFB laser.

[0008] According to some embodiments of the first aspect of the present invention, the main controller adopts FPGA.

[0009] According to a second aspect of the present invention, a multi-wavelength patrol fiber coding identification method includes the following steps: a main controller outputs a pulse drive instruction to the first high-power pulse light source of the high-power pulse light source group, the start time is t0, and the pulse width is t; wherein each of the high-power pulse light sources adopts a central wavelength of different sizes, corresponding to different code elements of the fiber coding; the first high-power pulse light source outputs a pulse light wave of a central wavelength to a wavelength division multiplexer, a circulator, and a fiber to be tested containing the fiber coding; the main controller controls the APD photoelectric collector to start to receive the reflected light wave signal and convert it into an analog level signal, the start time is t0, and the wavelength and energy of the reflected light wave signal of a single central wavelength pulse light wave in the entire fiber to be tested are collected; the analog level signal collected by the APD photoelectric collector is converted into a digital signal by an AD acquisition card and fed 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 collected digital signal; the remaining high-power pulse light sources are controlled to emit light one by one in sequence, and the above steps are repeated to collect the wavelengths and energies corresponding to different code elements, thereby realizing complete identification of the fiber coding.

[0010] The multi-wavelength patrol fiber optic coding identification method according to the second aspect of the present invention has at least the following beneficial effects: this embodiment utilizes multiple high-power pulse light sources with different central wavelengths to emit light one by one in a patrol manner, 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 the reflection signal acquisition of a single central wavelength light source in the entire optical fiber link can be completed at one time, thereby realizing faster identification of optical fiber coding at a lower cost.

[0011] According to some embodiments of the second aspect of the present invention, the high-power pulse light source group is composed of a plurality of high-power pulse light sources, and the spectrum of each of the high-power pulse light sources is ±0.5 nm of its central wavelength.

[0012] According to some embodiments of the second aspect of the present invention, the pulse width t=k*t00, wherein t00 is a reference pulse width, and k is a specified coefficient associated with the measured maximum distance.

[0013] According to some embodiments of the second aspect of the present invention, the collection time interval of the APD photoelectric collector is t11, and the collection time of each collection point is m*t11, where m is the collection point sequence number, and t11=t00*k.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of a fiber optic coding identification system according to an embodiment of the present invention;

[0017] Figure 2 The figure is a flow chart of a fiber coding identification method according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] A high-power pulse light source group 100, a wavelength division multiplexer 200, a circulator 300, an optical fiber 400, an optical fiber encoding 410, an APD photoelectric collector 500, an AD acquisition card 600, a main controller 700, and an amplifier 800. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] refer to Figure 1As shown, a multi-wavelength patrol fiber optic coding identification system of an embodiment of the present technical solution includes: a high-power pulse light source group 100, which is composed of a plurality of high-power pulse light sources of different wavelength bands; a wavelength division multiplexer 200, whose input ends are respectively connected to the plurality of high-power pulse light sources of different wavelength bands to achieve wavelength coupling of the high-power pulse light source group 100; a circulator 300, the circulator 300 having a first port, a second port, and a third port, the first port being connected to the output end of the wavelength division multiplexer 200; an optical fiber 400, the input end of the optical fiber 400 being connected to the second port of the circulator 300, and the optical fiber 400 being provided with an optical fiber coding 410; an APD photoelectric collector 500, connected to the third port of the circulator 300 to receive the light wave signal returned by the optical fiber code 410 and convert it into a level signal; an AD acquisition card 600, connected to the output end of the APD photoelectric collector 500 to convert the level signal of the APD photoelectric collector 500 into a digital signal and feed it back to the main controller 700; the main controller 700, respectively electrically connected to the high-power pulse light source group 100, the APD photoelectric collector 500, and the AD acquisition card 600, for controlling the various high-power pulse light sources of the high-power pulse light source group 100 to emit light in a patrol manner to realize the recognition of the optical fiber code 410.

[0024] The working process is as follows: 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 of a single central wavelength, and at the same time starts the APD photoelectric collector 500. The high-power pulse light wave signal enters the wavelength division multiplexer 200 for wavelength coupling, enters through the first port of the circulator 300, and is output to the fiber coding 410 on the optical fiber 400 through the second port. The fiber coding 410 will return the reflected and scattered light wave signals with unique identification characteristics, and sequentially pass through the second port of the circulator 300 and the third port of the circulator 300 to the APD photoelectric collector 500 for photoelectric conversion. Then, the AD acquisition card 600 converts the analog level signal into a digital signal, and feeds it back to the main controller 700 to identify the code element wavelength and energy of the fiber coding 410 corresponding to the single central wavelength, and then patrols different high-power pulse light sources one by one to output high-power pulse light wave signals of different central wavelengths, identifies other code element wavelengths and energies of the fiber coding 410, and thus forms a complete light coding.

[0025] Since the existing wavelength detector (wavelength demodulator) can only collect frequencies up to 10MHz, and a SOA optical switch is required to realize pulse control of the received light wave, and since the collection rate of the wavelength detector is not enough, each time the light source emits light, only a small section of the optical fiber can be collected. Multiple light emission and collection can complete the collection of the entire optical fiber link, resulting in low efficiency of the entire optical fiber coding recognition. This embodiment uses multiple high-power pulse light sources with different central wavelengths to patrol and emit light one by one, and cooperates with the fast recognition module composed of APD photoelectric collector and AD acquisition card, which can reach up to 10GHz (to save costs, we chose 400MHz), the collection frequency is more than 40 times that of the traditional wavelength detector, and can complete the reflection signal collection of a single central wavelength light source in the entire optical fiber link at one time, realizing faster recognition of optical fiber coding at a lower cost.

[0026] In some embodiments of the first aspect of the present invention, the multi-wavelength patrol fiber optic coding identification system also includes an amplifier 800 arranged between the APD photoelectric collector 500 and the AD acquisition card 600 to amplify the level signal of the APD photoelectric collector, thereby increasing the detection distance.

[0027] In view of volume and performance requirements, in some embodiments of the first aspect of the present invention, the high-power pulse light source group 100 adopts a DFB laser.

[0028] In some embodiments of the first aspect of the present invention, the main controller 700 adopts FPGA. On the one hand, it realizes the round-robin pulse driving and power control of the high-power pulse light source, and on the other hand, it realizes the data collection of the AD acquisition module; it can also realize that the difference between the luminous time of the high-power pulse light source and the collection point time of the APD photoelectric collector 500 is used to calculate the optical fiber length of the collection point; the FPGA main control module calculates the voltage and current required for the light intensity of the light source and the required pulse time, and supplies power to the light source. After the light source emits light, it is input into the optical fiber coding through the wavelength division multiplexer, the circulator, and the optical fiber. The back-reflected light in the optical fiber enters the APD photoelectric collector through the circulator and is converted into an analog electrical signal. The analog electrical signal is amplified by the amplifier and then input into the AD acquisition module. The AD acquisition module continuously collects according to the collection frequency. After driving the light source, the FPGA main control module starts to obtain the data information of the AD acquisition module including energy and time, so as to complete the luminescence and collection of the wavelength of a single light source. The FPGA main control module calculates the energy value of each point in the optical fiber and the optical fiber coding reflection wavelength corresponding to the light source according to the collected energy and time signals; after the output of multiple light sources with different central wavelengths, the optical fiber coding corresponding to the central wavelength is collected, and the current position of the distance is used to combine them to realize the complete collection of the optical fiber coding.

[0029] like Figure 2As shown, a multi-wavelength patrol optical fiber coding identification method according to the second aspect of the present invention comprises the following steps:

[0030] The main controller outputs a pulse driving instruction to the first high-power pulse light source of the high-power pulse light source group, with a start time of t0 and a pulse width of t; wherein each of the high-power pulse light sources adopts a central wavelength of different sizes, corresponding to different code elements of the optical fiber encoding;

[0031] The first high-power pulse light source outputs a pulse light wave with a central wavelength to a wavelength division multiplexer, a circulator, and a fiber to be tested containing a fiber code;

[0032] The main controller controls the APD photoelectric collector to start up to receive the reflected light wave signal and convert it into an analog level signal. The start time is t0, and the wavelength and energy of the reflected light wave signal of a single central wavelength pulse light wave in the entire optical fiber to be tested are collected;

[0033] The analog level signal collected by the APD photoelectric collector is converted into a digital signal by using an AD acquisition card and fed back to the main controller;

[0034] The main controller calculates the energy value of each point in the optical fiber and the optical fiber coded reflection wavelength corresponding to the first high-power pulse light source based on the collected digital signal;

[0035] The remaining high-power pulse light sources are controlled to emit light one by one in sequence, and the above steps are repeated to collect the wavelengths and energies corresponding to different code elements, thereby achieving complete recognition of the optical fiber coding.

[0036] This embodiment utilizes multiple high-power pulse light sources with different central wavelengths to emit light one by one in rotation, 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 the reflection signal acquisition of a single central wavelength light source in the entire optical fiber link can be completed at one time, thereby realizing faster identification of optical fiber coding at a lower cost.

[0037] In some embodiments of the second aspect of the present invention, the high-power pulse light source group is composed of multiple high-power pulse light sources, the spectrum of each high-power pulse light source is ±0.5nm of its central wavelength, and the central wavelength interval between two adjacent high-power pulse light sources is 1nm; it is directly controlled by the FPGA main control module, and the light intensity and pulse modulation are performed one by one.

[0038] In some embodiments of the second aspect of the present invention, the pulse width t=k*t00, wherein t00 is a reference pulse width, and k is a specified coefficient associated with the maximum distance measured.

[0039] In some embodiments of the second aspect of the present invention, the collection time interval of the APD photoelectric collector is t11, and the collection time of each collection point is m*t11, where m is the collection point sequence number, and t11=t00*k, where t11 directly affects the collection accuracy, and the smaller the value, the higher the collection accuracy.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-wavelength patrol optical fiber coding identification system, characterized in that: include A high-power pulse light source group (100), composed of a plurality of high-power pulse light sources in different wavelength bands; A wavelength division multiplexer (200), the input ends of which are respectively connected to the plurality of high-power pulse light sources in different wavelength bands to achieve wavelength coupling of the high-power pulse light source group (100); A circulator (300), the circulator (300) having a first port, a second port, and a third port, the first port being connected to an output end of the wavelength division multiplexer (200); An optical fiber (400), the input end of the optical fiber (400) being connected to the second port of the circulator (300), and an optical fiber code (410) being provided on the optical fiber (400); An APD photoelectric collector (500) is connected to the third port of the circulator (300) to receive the optical wave signal returned by the optical fiber encoding (410) and convert it into a level signal; An AD acquisition card (600) connected to the output end of the APD photoelectric collector (500) for converting the level signal of the APD photoelectric collector (500) into a digital signal and feeding it back to the main controller (700); The main controller (700) is electrically connected to the high-power pulse light source group (100), the APD photoelectric collector (500), and the AD acquisition card (600), respectively, and is used to control the high-power pulse light sources of the high-power pulse light source group (100) to emit light in a round-robin manner to realize the recognition of the optical fiber code (410).

2. The multi-wavelength patrol optical fiber coding identification system according to claim 1, characterized in that: It also includes an amplifier (800) arranged between the APD photoelectric collector (500) and the AD acquisition card (600).

3. The multi-wavelength patrol fiber coding identification system according to claim 1, characterized in that: The high-power pulse light source group (100) adopts a DFB laser.

4. The multi-wavelength patrol optical fiber coding identification system according to claim 1, characterized in that: The main controller (700) adopts FPGA.

5. A multi-wavelength patrol fiber coding identification method, applied to the multi-wavelength patrol fiber coding identification system as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: The main controller outputs a pulse driving instruction to the first high-power pulse light source of the high-power pulse light source group, with a start time of t0 and a pulse width of t; wherein each of the high-power pulse light sources adopts a central wavelength of different sizes, corresponding to different code elements of the optical fiber encoding; The first high-power pulse light source outputs a pulse light wave with a central wavelength to a wavelength division multiplexer, a circulator, and a fiber to be tested containing a fiber code; The main controller controls the APD photoelectric collector to start up to receive the reflected light wave signal and convert it into an analog level signal. The start time is t0, and the wavelength and energy of the reflected light wave signal of a single central wavelength pulse light wave in the entire optical fiber to be tested are collected; The analog level signal collected by the APD photoelectric collector is converted into a digital signal by using an AD acquisition card and fed back to the main controller; The main controller calculates the energy value of each point in the optical fiber and the optical fiber coded reflection wavelength corresponding to the first high-power pulse light source based on the collected digital signal; The remaining high-power pulse light sources are controlled to emit light one by one in sequence, and the above steps are repeated to collect the wavelengths and energies corresponding to different code elements, thereby achieving complete recognition of the optical fiber coding.

6. A multi-wavelength patrol optical fiber coding identification method according to claim 5, characterized in that: The high-power pulse light source group is composed of a plurality of high-power pulse light sources, and the spectrum of each high-power pulse light source is ±0.5 nm of its central wavelength.

7. The optical fiber coding identification method of multi-wavelength patrol according to claim 5, characterized in that: The pulse width t=k*t00, wherein t00 is a reference pulse width, and k is a specified coefficient associated with the maximum distance measured.

8. A multi-wavelength patrol optical fiber coding identification method according to claim 7, characterized in that: The collection time interval of the APD photoelectric collector is t11, and the collection time of each collection point is m*t11, where m is the collection point sequence number, and t11=t00*k.

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