CN110048766B - Rapid optical fiber code identification system and identification method based on narrow-band light waves - Google Patents
Rapid optical fiber code identification system and identification method based on narrow-band light waves Download PDFInfo
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- CN110048766B CN110048766B CN201910323018.8A CN201910323018A CN110048766B CN 110048766 B CN110048766 B CN 110048766B CN 201910323018 A CN201910323018 A CN 201910323018A CN 110048766 B CN110048766 B CN 110048766B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 69
- 238000001228 spectrum Methods 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims description 53
- 238000005259 measurement Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The invention discloses a rapid optical fiber code identification system and an identification method based on narrow-band light waves, wherein the identification system comprises a laser light source for outputting a narrow-band spectrum, an annular coupler for forming a reflection loop, a photoelectric detection module for collecting reflected light signals, an optical fiber grating combination sequence for representing optical fiber codes and a main control module for controlling, the main control module is connected with the laser light source and the photoelectric detection module, an output end of the laser light source and the photoelectric detection module are respectively connected to the annular coupler through optical fibers, and an output end of the annular coupler is connected with the optical fiber grating combination sequence through optical fibers. The invention solves the problems of slow speed, poor ranging precision and high price when the traditional fiber grating demodulator recognizes the fiber grating combination sequence, adopts the narrow-band spectrum output and the photoelectric detection module, realizes high-speed recognition and high-precision ranging, has low price and is suitable for large-area popularization.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a rapid optical fiber coding recognition system and a recognition method based on narrow-band light waves.
Background
The existing optical fiber code identification technology mainly depends on an optical fiber grating mediator, but the existing optical fiber grating mediator adopts a CCD chip, the identification speed is low, the acquisition frequency is generally not more than 100KHz, and the optical fiber grating mediator is expensive and cannot be equipped for a large number of engineering personnel, so that the identification of the optical fiber grating combination sequence is unfavorable.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a rapid optical fiber coding recognition system and a recognition method based on narrow-band light waves, wherein the recognition system has a relatively simple structure, low manufacturing cost and high acquisition frequency, and is beneficial to large-area use.
According to a first aspect of the present invention, there is provided a rapid optical fiber coding identification system based on narrowband optical waves, which comprises a laser light source for outputting narrowband optical waves, an annular coupler for forming a reflection loop, a photoelectric detection module for collecting reflected optical signals, a fiber grating combination sequence for representing optical fiber coding, and a main control module for controlling, wherein the main control module is connected with the laser light source and the photoelectric detection module, an output end of the laser light source and the photoelectric detection module are respectively connected to the annular coupler through optical fibers, and an output end of the annular coupler is connected with the fiber grating combination sequence through optical fibers.
The rapid optical fiber coding identification system based on the narrow-band light waves has the following beneficial effects: the laser light source outputs a narrow-band spectrum to detect the fiber bragg grating combination sequence, the annular coupler is used for structurally receiving reflected light reflected by the same section of optical fiber, and the photoelectric detection module detects the reflected light to determine the distance and sequence characteristics of the fiber bragg grating combination sequence.
Further, according to the fast optical fiber coding identification system based on narrowband optical waves of the first aspect of the present invention, the laser light source includes a tunable laser and an optical switch for filtering a spectrum, the tunable laser is connected to the optical switch through an optical fiber, and the tunable laser and the optical switch are respectively connected to the main control module. By combining the tunable laser and the optical switch, the narrow-band pulse with very high precision and very small bandwidth can be output, which is beneficial to improving the identification precision.
Further, according to the rapid optical fiber coding identification system based on narrowband optical waves of the first aspect of the present invention, the laser light source comprises a broad spectrum pulse laser and a tunable filter, the broad spectrum pulse laser is connected with the tunable filter through an optical fiber, and the broad spectrum pulse laser and the tunable filter are respectively connected to the main control module. The broad spectrum pulse laser can output a narrow band spectrum through the tunable filter, and the realization is convenient and the cost is low.
Further, according to the fast optical fiber code identification system based on narrowband optical waves of the first aspect of the present invention, the photoelectric detection module is an amplifying type InGaAs avalanche photodiode.
Further, according to the rapid optical fiber coding identification system based on narrowband optical waves of the first aspect of the invention, the optical fiber grating combination sequence is an optical fiber bragg grating combination.
According to a second aspect of the present invention, there is provided an identification method using any one of the above-mentioned narrowband optical-wave-based rapid optical fiber code identification systems, comprising the steps of:
The laser light source outputs more than one narrow-band spectrum;
the photoelectric detection module detects the reflected light intensity of the narrowband spectrum reflected by the fiber grating combination sequence;
And the main control module obtains the sequence characteristics and the positions of the fiber bragg grating combination sequences according to the reflected light intensity and the reflected time of the narrow-band spectrum, wherein the wavelength corresponding to the maximum value of the reflected light intensity is the reflected wavelength of the fiber bragg grating combination sequences.
The rapid optical fiber coding identification method based on the narrow-band light waves has the following advantages: the high precision detection of the center wavelength of the fiber bragg grating combination sequence by utilizing the narrow band spectrum can enable the photoelectric detection module to accurately show the relation between the reflected light intensity and the time, the time difference between the emergent light and the incident light can be known by the time, so that the position of the fiber bragg grating combination sequence is calculated, and the corresponding center wavelength and the sequence characteristics of the fiber bragg grating combination sequence can be known by the reflected light intensity.
Further, according to the identification method based on the narrowband optical wave fast fiber encoding of the second aspect of the present invention, the laser light source outputs three measurement wavelengths, f0+n×f2-f1/4, f0+n×f2, and f0+n×f2+f1/4, respectively, where f0 is one of the central wavelengths of the fiber grating combination sequence, f1 is a bandwidth of the central wavelength f0, f2 is a wavelength interval between two adjacent central wavelengths, and n is a natural number smaller than the central wavelengths in the fiber grating combination sequence. The method is suitable for the multi-wavelength characteristic of the fiber bragg grating combination sequence, the output wavelength of the laser source is expanded by the central wavelength f0, the position and the sequence characteristic of the fiber bragg grating combination sequence can be accurately positioned, and the method is particularly suitable for specific known fiber bragg grating combination sequences.
Further, according to the identification method based on the rapid optical fiber coding of the narrowband optical wave of the second aspect of the present invention, the laser light source outputs continuous narrowband spectra, and the fiber grating combination sequence reflects more than one narrowband spectra. The continuous narrowband spectrum corresponds to scanning over a range of wavelengths, and the position and center wavelength of the fiber grating combination sequence in the undefined fiber can be determined.
Further, according to the identification method based on the rapid optical fiber coding of the narrowband optical wave of the second aspect of the present invention, the opening and closing interval duration of the photoelectric detection module is controlled according to the estimated position of the optical fiber grating combination sequence. The selection of the open window can avoid receiving noise and can also shield off non-target fiber grating combination sequences.
Further, according to the identification method based on the rapid optical fiber coding of the narrowband optical wave of the second aspect of the present invention, the laser light source includes a tunable laser and an optical switch for filtering a spectrum, the tunable laser is connected to the optical switch through an optical fiber, if the required ranging precision is low, the tunable laser directly outputs the narrowband spectrum, the optical switch is kept in a normally open state, if the ranging precision is high, the tunable laser is lifted to start preheating, and after entering normal operation, the optical switch is rapidly turned on and off to reduce the bandwidth of the narrowband spectrum. The working mode is selected according to the distance measurement precision, so that the method is very flexible, can adapt to different scenes and improves the recognition speed.
Drawings
The invention is further described below with reference to the drawings and examples;
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a structural connection of a second embodiment of the present invention;
FIG. 3 is a flow chart of an identification method of the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, a first embodiment of the present invention relates to a rapid optical fiber code recognition system based on narrowband optical waves, including a laser light source for outputting narrowband optical spectrum, a ring coupler for forming a reflection loop, a photoelectric detection module for collecting reflected optical signals, a fiber grating combination sequence for representing optical fiber codes, and a master control module for controlling, the laser light source includes a tunable laser and an optical switch for filtering optical spectrum, and an electrical connection portion includes: the main control module is connected with the tunable laser, the optical switch and the photoelectric detection module respectively, and the optical fiber connection part comprises: the tunable laser is connected with the optical switch, the optical switch and the photoelectric detection module are respectively connected to the annular coupler, and the output end of the annular coupler is connected with the fiber bragg grating combination sequence. The photodetecting module in this embodiment is an amplified InGaAs avalanche photodiode.
In order to improve the recognition accuracy, the optical switch uses a high-speed optical switch having a nanosecond response speed, and the photoelectric detection module, that is, the amplification type ingaas avalanche photodiode, indicates the received reflected light intensity exceeding the threshold value at a high level. The central wavelength of each grating in the fiber grating combination sequence can be arbitrarily selected, but in view of the limitation of the opening and closing starting time of the tunable laser, the central wavelength of one grating is preferably f0 and the bandwidth is preferably f1, and the interval between the central wavelengths of two adjacent gratings is kept to be f2, so that the identification of the fiber grating combination sequence can be realized without adopting full-range wavelength scanning.
Referring to fig. 3, for a rapid optical fiber code identification system based on narrowband optical waves in this embodiment, a rapid optical fiber code identification method based on narrowband optical waves is further provided, which includes the following steps:
The tunable laser outputs three narrowband spectrums through the optical switch, the three narrowband spectrums respectively comprising the following wavelengths: f0+nf2-f 1/4, f0+nf2 and f0+nf2+f1/4, wherein f0 is one of the central wavelengths of the fiber bragg grating combination sequence, f1 is the bandwidth of the central wavelength f0, f2 is the wavelength interval between two adjacent central wavelengths, and n is a natural number smaller than the central wavelength in the fiber bragg grating combination sequence;
The photoelectric detection module detects the reflected light intensity of the narrowband spectrum reflected by the fiber grating combination sequence;
The main control module obtains the sequence characteristics and the positions of the fiber bragg grating combination sequences according to the reflection light intensity and the reflection time of the narrow-band spectrum, wherein the wavelength corresponding to the maximum value of the reflection light intensity is the reflection wavelength of the fiber bragg grating combination sequences.
During practical use, a specific fiber bragg grating combination sequence is generally identified, and the opening and closing interval time of the photoelectric detection module is controlled according to the position of the estimated fiber bragg grating combination sequence, so that noise signals and non-target reflected signals can be shielded, and the calculated amount of the system is reduced.
Because the existing tunable laser has the problem of long starting time, the identification system automatically starts the tunable laser in advance to select a central wavelength, such as f0, outputs a narrow-wave spectrum, starts an optical switch and an amplifying indium gallium arsenic avalanche photodiode in the later period, outputs a plurality of narrow-band spectrums through a high-speed optical switch, then reflects corresponding narrow-band spectrums through a fiber bragg grating combination sequence, and the reflected narrow-band spectrums acquire high-level signals through the amplifying indium gallium arsenic avalanche photodiode, so that the identification, the ranging and the like of the fiber bragg grating are finally realized; specifically, for each grating in the fiber bragg grating combination sequence, a tunable laser selects a narrow-wave spectrum incident fiber with a central wavelength, when the energy value acquired by an amplifying InGaAs avalanche photodiode exceeds a threshold value, it is indicated that a fiber bragg grating corresponding to the narrow-wave spectrum exists in a certain acquisition point in the fiber, and when a continuous narrow-band spectrum is incident into the fiber, the fiber bragg grating reflects a plurality of corresponding narrow-band spectrums, the energy value of the reflection acquisition point is utilized to calculate the central wavelength, bandwidth and length of the corresponding fiber bragg grating, the fiber bragg grating combination sequence is found according to the length, and the fiber bragg code of the fiber bragg grating combination sequence is calculated, so that the identification and measurement of the fiber bragg grating combination sequence are completed.
When the distance measurement precision is low, the tunable laser directly outputs a pulse narrow-band spectrum, and the optical switch is normally open; when the distance measurement precision needs to be high, the tunable laser is started in advance, and the optical switch is started in the later stage to output a short pulse narrow band spectrum.
In addition, although the above measurement is performed by using a separate narrow-band pulse method, it is actually possible to perform a full-range narrow-band scanning to increase the precision of the center wavelength, and this corresponds to scanning in a wavelength range, and it is possible to determine the position and the center wavelength of the fiber grating combination sequence in the undefined optical fiber.
Referring to fig. 2, a second embodiment of the present invention relates to a rapid optical fiber code recognition system based on narrowband optical waves, including a laser light source for outputting narrowband spectrum, a ring coupler for forming a reflection loop, a photoelectric detection module for collecting reflected light signals, a fiber grating combination sequence for representing optical fiber codes, and a master control module for controlling, the laser light source includes a broad spectrum pulse laser and a tunable filter, and an electrical connection part includes: the main control module is connected with the broad spectrum pulse laser, the tunable filter and the photoelectric detection module respectively, and the optical fiber connection part comprises: the wide-spectrum pulse laser is connected with a tunable filter, the tunable filter and the photoelectric detection module are respectively connected to an annular coupler, and the output end of the annular coupler is connected with the fiber bragg grating combination sequence. In this embodiment, the fiber bragg grating combination sequence is a fiber bragg grating combination.
The difference between this embodiment and the first embodiment is that the manner of generating the narrowband spectrum is different, and since the on-off time of the tunable filter is long, the tunable filter needs to be turned on in advance as needed, and the tunable filter is set to a specific narrowband spectrum, the output manner and the detection manner after passing through the tunable filter are the same as those of the first embodiment.
The two embodiments of the invention solve the problems of slow speed, poor ranging precision and high price when the traditional fiber bragg grating demodulator recognizes the fiber bragg grating combined sequence, and the high-speed recognition and high-precision ranging of the fiber bragg grating combined sequence are realized by adopting the narrow-band spectrum output and the photoelectric detection module, and the whole system has low price and is suitable for large-area popularization.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (9)
1. A rapid optical fiber coding recognition system based on narrow-band light waves is characterized in that: the device comprises a laser light source for outputting a narrow-band spectrum, an annular coupler for forming a reflection loop, a photoelectric detection module for collecting reflected light signals, a fiber grating combination sequence for representing fiber coding and a main control module for controlling, wherein the main control module is connected with the laser light source and the photoelectric detection module, the output end of the laser light source and the photoelectric detection module are respectively connected to the annular coupler through optical fibers, and the output end of the annular coupler is connected with the fiber grating combination sequence through optical fibers; the laser light source comprises a tunable laser and an optical switch for filtering a spectrum, the tunable laser is connected with the optical switch through an optical fiber, if the required ranging accuracy is low, the tunable laser directly outputs a narrow-band spectrum, the optical switch is kept in a normally open state, if the ranging accuracy is high, the tunable laser is started to be preheated in advance, and after entering normal work, the optical switch is rapidly opened and closed to reduce the bandwidth of the narrow-band spectrum.
2. The rapid fiber optic code identification system based on narrowband optical waves of claim 1, wherein: the laser light source comprises a tunable laser and an optical switch for filtering a spectrum, the tunable laser is connected with the optical switch through an optical fiber, and the tunable laser and the optical switch are respectively connected to the main control module.
3. The rapid fiber optic code identification system based on narrowband optical waves of claim 1, wherein: the laser light source comprises a broad spectrum pulse laser and a tunable filter, wherein the broad spectrum pulse laser is connected with the tunable filter through an optical fiber, and the broad spectrum pulse laser and the tunable filter are respectively connected to the main control module.
4. A rapid optical fiber code identification system based on narrowband optical waves according to claim 1 or 2, characterized in that: the photoelectric detection module is an amplifying type InGaAs avalanche photodiode.
5. The rapid fiber optic code identification system based on narrowband optical waves of claim 1, wherein: the fiber bragg grating combination sequence is a fiber bragg grating combination.
6. A method of identifying a rapid optical fiber code identification system based on narrowband optical waves as claimed in any one of claims 1 to 5, comprising the steps of:
The laser light source outputs more than one narrow-band spectrum;
the photoelectric detection module detects the reflected light intensity of the narrowband spectrum reflected by the fiber grating combination sequence;
The main control module obtains the sequence characteristics and the positions of the fiber bragg grating combination sequences according to the reflected light intensity and the reflected time of the narrow-band spectrum, wherein the wavelength corresponding to the maximum value of the reflected light intensity is the reflected wavelength of the fiber bragg grating combination sequences;
The laser light source comprises a tunable laser and an optical switch for filtering a spectrum, the tunable laser is connected with the optical switch through an optical fiber, if the required ranging accuracy is low, the tunable laser directly outputs a narrow-band spectrum, the optical switch is kept in a normally open state, if the ranging accuracy is high, the tunable laser is started to be preheated in advance, and after the tunable laser enters normal operation, the optical switch is rapidly opened and closed to reduce the bandwidth of the narrow-band spectrum.
7. The identification method of claim 6, wherein: the laser light source outputs three measurement wavelengths, namely f0+n f2-f1/4, f0+n f2 and f0+n f2+f1/4, wherein f0 is one of the center wavelengths of the fiber bragg grating combination sequence, f1 is the bandwidth of the center wavelength f0, f2 is the wavelength interval between two adjacent center wavelengths, and n is a natural number smaller than the center wavelength in the fiber bragg grating combination sequence.
8. The identification method of claim 6, wherein: the laser light source outputs continuous narrow-band spectrum, and the fiber bragg grating combination sequence reflects more than one narrow-band spectrum.
9. The identification method of claim 6, wherein: and controlling the opening and closing interval time of the photoelectric detection module according to the estimated position of the fiber bragg grating combination sequence.
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| CN201910323018.8A CN110048766B (en) | 2019-04-22 | 2019-04-22 | Rapid optical fiber code identification system and identification method based on narrow-band light waves |
| PCT/CN2019/098596 WO2020215518A1 (en) | 2019-04-22 | 2019-07-31 | Narrowband light wave-based rapid optical fiber code recognition system and recognition method |
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| CN110048766B (en) * | 2019-04-22 | 2024-04-26 | 佛山市冰蓝科技有限公司 | Rapid optical fiber code identification system and identification method based on narrow-band light waves |
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| CN111693077A (en) * | 2020-06-23 | 2020-09-22 | 中山水木光华电子信息科技有限公司 | Optical fiber code identification system and method for automatically determining measurement threshold |
| CN111665520B (en) * | 2020-06-24 | 2023-09-29 | 中山水木光华电子信息科技有限公司 | Identification system, method, device and storage medium |
| CN111934811A (en) * | 2020-07-24 | 2020-11-13 | 中山水木光华电子信息科技有限公司 | System and method for realizing field operation optical cable optimal transmission waveband through optical fiber coding |
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| CN113904730B (en) * | 2021-10-13 | 2024-11-01 | 中山水木光华电子信息科技有限公司 | Optical fiber coding recognition and communication integrated system and control method |
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| CN115396037A (en) * | 2022-08-25 | 2022-11-25 | 中山水木光华电子信息科技有限公司 | A multi-wavelength interval DFB array light source, optical fiber code demodulation system and method |
| CN115473581B (en) * | 2022-09-29 | 2024-12-27 | 佛山市冰蓝科技有限公司 | DFB array coupling adjustable light source, optical fiber coding demodulation system and method |
| CN117706529A (en) * | 2023-12-22 | 2024-03-15 | 扬州群发光芯科技有限公司 | Wavelength tuning method suitable for OPA laser radar and optical module |
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