Optical fiber coding identification system and method for automatically determining measurement threshold

Abstract

The present invention discloses a fiber coding identification system for self-determining measurement thresholds, comprising: a light source module; 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 light source module; a splitter, the input end of the splitter being connected to the second port of the circulator, the splitter having a main splitting end and a secondary splitting end, the main splitting end being used to connect an optical fiber with fiber coding; a reflector, connected to the secondary splitting end of the splitter; a waveform detector, the input end of the waveform detector being connected to the third port of the circulator; and a main controller, electrically connected to the light source module and the waveform detector, respectively. The splitter and the reflector are used to reflect all the split light waves, and the system can determine the initial light intensity threshold according to the reflected light wave and the splitting ratio, and then calculate the light intensity threshold of the test point on the optical fiber. This solution does not require manual participation, and the system can determine the measurement threshold by itself, and the detection is efficient and can avoid environmental factors affecting the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication, and in particular to an optical fiber coding identification system and method for automatically determining a measurement threshold. Background Art

[0002] In the field of fiber optic communications, fiber coding is composed of multiple fiber gratings of different wavelengths, and the fiber coding identification system is an optical detection system that accurately identifies the wavelength of its fiber grating. Since different optical fibers require light signals of corresponding sizes to detect, the output light intensity of the current optical detection system relies on manual detection. Since the optical fiber has a certain distance, manual detection of the output light intensity is not only inefficient but also affected by the environment (such as changes in the optical path structure), resulting in insufficient accuracy. 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 fiber optic coding identification system that can determine the measurement threshold by itself, which can efficiently and accurately detect the threshold of the system output light intensity; the present invention also provides a method for the fiber optic coding identification system to determine the measurement threshold by itself.

[0004] According to the first aspect of the present invention, an optical fiber coding identification system that self-determines a measurement threshold comprises: a light source module, which is used to output a light wave signal for testing; 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 light source module; a splitter, the input end of the splitter being connected to the second port of the circulator, the splitter having a main splitter end and a sub-splitter end, the main splitter end being used to connect an optical fiber with optical fiber coding; a reflector, which is connected to the sub-splitter end of the splitter; a waveform detector, the input end of the waveform detector being connected to the third port of the circulator; and a main controller, which is electrically connected to the light source module and the waveform detector, respectively.

[0005] The optical fiber coding identification system for self-determining the measurement threshold according to the first embodiment of the present invention has at least the following beneficial effects: a total reflection point is formed by using a beam splitter and a reflector to reflect all the split light waves. The system can determine the initial light intensity threshold based on the reflected light wave and the splitting ratio, and then calculate the light intensity threshold of the test point on the optical fiber. This solution does not require human intervention, and the measurement threshold can be determined by the system itself. The detection is efficient and can avoid environmental factors affecting the detection accuracy.

[0006] According to some embodiments of the first aspect of the present invention, the light source module includes a driver with adjustable output current and a light source driven by the driver, and the driver is electrically connected to the main controller.

[0007] According to some embodiments of the first aspect of the present invention, the light source is a narrow bandwidth light source or a pulse light source.

[0008] According to some embodiments of the first aspect of the present invention, the light source module also includes a first SOA optical switch electrically connected to the main controller, the first SOA optical switch is connected between the light source and the first port of the circulator, and the light source adopts a large-bandwidth light source; a second SOA optical switch is arranged between the input end of the waveform detector and the third port of the circulator, and the second SOA optical switch is electrically connected to the main controller.

[0009] According to some embodiments of the first aspect of the present invention, the splitting ratio between the main splitting end and the auxiliary splitting end of the splitter is 99:1.

[0010] According to some embodiments of the first aspect of the present invention, the waveform detector uses a demodulator to achieve light wave separation and wavelength measurement.

[0011] According to some embodiments of the first aspect of the present invention, the main controller adopts an FPGA controller.

[0012] According to a second aspect of an embodiment of the present invention, a method for a fiber optic coding identification system to automatically determine a measurement threshold comprises the following steps: using a splitter to split the light wave output into two paths, one path is output to an optical fiber with fiber optic coding, and the other path is output to a reflector; collecting the light wave signal intensity reflected by the reflector, and calculating the initial light wave signal intensity based on the splitting output ratio of the splitter; using the initial light wave signal intensity and the attenuation coefficient of the optical fiber to calculate the threshold of the optical fiber measurement point, wherein the attenuation coefficient is determined by the optical fiber material and the optical fiber length.

[0013] The method for the optical fiber coding identification system to automatically determine the measurement threshold according to the second embodiment of the present invention has at least the following beneficial effects: a total reflection point is formed by using a beam splitter and a reflector to reflect all the split light waves. The system can determine the initial light intensity threshold based on the reflected light wave and the splitting ratio, and then calculate the light intensity threshold of the test point on the optical fiber. This solution does not require human intervention, and the measurement threshold can be determined by the system automatically. The detection is efficient and can avoid environmental factors affecting the detection accuracy.

[0014] According to some embodiments of the second aspect of the present invention, collecting the intensity of the light wave signal reflected by the reflector includes: obtaining a continuous spectrum of reflection; determining the position of the light wave signal reflected by the reflector from the continuous spectrum; and obtaining the intensity of the light wave signal at the position of the light wave signal reflected by the reflector.

[0015] According to some embodiments of the second aspect of the present invention, the threshold value F1 of the optical fiber measurement point is F0 / (10^(r / 10)), wherein F0 is defined as the initial light wave signal intensity, and r is the attenuation coefficient of the optical fiber.

[0016] 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

[0017] 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:

[0018] Figure 1 It is a schematic diagram of a fiber coding identification system according to an embodiment of the first aspect of the present invention;

[0019] Figure 2 A flow chart of a method for the optical fiber coding identification system to automatically determine a measurement threshold value according to an embodiment of the second aspect of the present invention;

[0020] Figure 3 A reflection position spectrum diagram of a reflector according to an embodiment of the second aspect of the present invention;

[0021] Figure 4 This is a fiber coded reflection position spectrum diagram of an embodiment of the second aspect of the present invention.

[0022] Reference numerals:

[0023] Light source module 100, driver 110, light source 120, first SOA optical switch 130, second SOA optical switch 140;

[0024] Circulator 200 , optical splitter 300 , optical fiber encoding 400 , optical fiber 500 , reflector 600 , waveform detector 700 , main controller 800 . DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] refer to Figure 1 As shown, a fiber optic coding identification system for self-determining a measurement threshold value according to an embodiment of the first aspect of the present technical solution comprises: a light source module 100, for outputting a light wave signal for testing; a circulator 200, the circulator 200 having a first port, a second port, and a third port, the first port being connected to the output end of the light source module 100; a splitter 300, the input end of the splitter 300 being connected to the second port of the circulator 200, the splitter 300 having a main splitting end and a sub-splitting end, the main splitting end being used to connect an optical fiber 500 with a fiber optic coding 400; a reflector 600, connected to the sub-splitting end of the splitter 300; a waveform detector 700, the input end of the waveform detector 700 being connected to the third port of the circulator 200; and a main controller 800, electrically connected to the light source module 100 and the waveform detector 700, respectively.

[0029] The working process is as follows: the main controller 800 controls the light source module 100 to output a light wave signal, which enters through the first port of the circulator 200 and is output to the optical splitter 300 through the second port. The optical splitter 300 outputs most of the input light waves from the main splitting end to the optical fiber 500 with the optical fiber coding 400 according to a preset ratio. A small part of the input light waves is all reflected from the reflector, and passes through the optical splitter 300, the second port of the circulator 200, the third end of the circulator 200, and the main controller port to the waveform detector 700 in sequence. The waveform detector 700 can detect the reflected light wave and feed it back to the main controller 800 to determine the initial light intensity threshold according to the splitting ratio, and then calculate the light intensity threshold of the test point on the optical fiber.

[0030] As described above, according to the first embodiment of the present invention, the optical fiber coding identification system that determines the measurement threshold by itself uses a spectrometer and a reflector to form a total reflection point to reflect all the split light waves. The system can determine the initial light intensity threshold based on the reflected light waves and the splitting ratio, and then calculate the light intensity threshold of the test point on the optical fiber. This solution does not require human intervention, and the measurement threshold can be determined by the system by itself. The detection is efficient and can avoid environmental factors affecting the detection accuracy.

[0031] In some embodiments of the first aspect of the present invention, the light source module 100 includes a driver 110 with adjustable output current and a light source 120 driven by the driver 110. The driver 110 is electrically connected to the main controller 800. The driver 110 supplies power to the light source. The driver 110 is controlled by the main controller 800 to control its output current according to the calculated light intensity threshold of the test point on the optical fiber, thereby controlling the light intensity of the light source 120.

[0032] In some embodiments of the first aspect of the present invention, the light source 120 is a narrow bandwidth light source or a pulse light source.

[0033] In view of the large wavelength band required for optical fiber coding, in some embodiments of the first aspect of the present invention, the light source 120 adopts a large-bandwidth light source. The light source module 100 also includes a first SOA optical switch 130 electrically connected to the main controller 800, and the first SOA optical switch 130 is connected between the light source 120 and the first port of the circulator 200; a second SOA optical switch 140 is arranged between the input end of the waveform detector 700 and the third port of the circulator 200, and the second SOA optical switch 140 is electrically connected to the main controller 800.

[0034] The first SOA optical switch 130 and the second SOA optical switch 140 have the function of high-speed opening and closing, and also have the function of light wave amplification. The two SOAs form pulse control of sending and receiving light waves, realize input of light waves into the optical fiber, and at the same time receive the light waves reflected and scattered by the optical fiber. The opening and closing time difference between the two times the speed of light is the light intensity transmission distance.

[0035] In some embodiments of the first aspect of the present invention, the splitting ratio between the main splitting end and the auxiliary splitting end of the splitter 300 is 99: 1. The splitter 300 realizes the energy distribution of the light wave. Considering that it is necessary to retain a sufficiently large light intensity to realize long-distance testing and the splitter is at the near end, a 99: 1 splitter is preferably used after calculation, 99% of the light intensity is output to the optical fiber 500, and 1% of the light intensity is output to the reflector 600.

[0036] In some embodiments of the first aspect of the present invention, the waveform detector 700 preferably adopts a demodulator to achieve separation of light waves and wavelength measurement.

[0037] In some embodiments of the first aspect of the present invention, the main controller 800 preferably adopts an FPGA controller.

[0038] like Figure 2 As shown, a method for a fiber optic coding identification system to automatically determine a measurement threshold value in an embodiment of the second aspect of the present invention includes the following steps: using a splitter to split the light wave output into two paths, one path is output to the optical fiber with fiber optic coding, and the other path is output to the reflector; collecting the light wave signal intensity reflected by the reflector, and calculating the initial light wave signal intensity based on the splitting output ratio of the splitter; using the initial light wave signal intensity and the attenuation coefficient of the optical fiber to calculate the threshold value of the optical fiber measurement point, wherein the attenuation coefficient is determined by the optical fiber material and the optical fiber length.

[0039] This embodiment uses a beam splitter and a reflector to form a total reflection point to reflect all the split light waves. The system can determine the initial light intensity threshold based on the reflected light waves and the splitting ratio, and then calculate the light intensity threshold of the test point on the optical fiber. This solution does not require human intervention, and the system can determine the measurement threshold by itself. The detection is efficient and can avoid environmental factors affecting the detection accuracy.

[0040] In some embodiments of the second aspect of the present invention, collecting the intensity of the light wave signal reflected by the reflector includes: obtaining a continuous spectrum of reflection; determining the position of the light wave signal reflected by the reflector from the continuous spectrum, such as Figure 3 ; Get the light wave signal intensity at the position of the light wave signal reflected by the reflector.

[0041] In some embodiments of the second aspect of the invention, the optical fiber measurement point (e.g. Figure 4 The threshold value of the fiber-coded continuous spectrum shown in the figure (the fiber-coded spectrum is composed of multiple fiber gratings of different wavelengths) is F1=F0 / (10^(r / 10)), where F0 is defined as the initial light wave signal intensity and r is the attenuation coefficient of the optical fiber.

[0042] In some embodiments of the second aspect of the present invention, the wavelength of the grating code can be determined by searching for a peak in the continuous spectrum of the grating according to the initial light wave signal intensity F0.

[0043] 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.

[0044] 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 fiber coding recognition system that can automatically determine a measurement threshold, characterized in that: include: A light source module (100), used for outputting a light wave signal for testing; A circulator (200), the circulator (200) having a first port, a second port, and a third port, the first port being connected to an output end of the light source module (100); An optical splitter (300), the input end of the optical splitter (300) being connected to the second port of the circulator (200), the optical splitter (300) having a main optical splitting end and a secondary optical splitting end, the main optical splitting end being used to connect to an optical fiber (500) with an optical fiber code (400); A reflector (600) connected to the secondary light splitting end of the light splitter (300); A waveform detector (700), wherein an input end of the waveform detector (700) is connected to a third port of the circulator (200); A main controller (800) is electrically connected to the light source module (100) and the waveform detector (700), respectively; the main controller (800) determines an initial light intensity threshold according to the splitting ratio, and then calculates the light intensity threshold of a test point on the optical fiber; the method for the optical fiber coding identification system to automatically determine the measurement threshold comprises the following steps: using a splitter to split the light wave output into two paths, one path is output to the optical fiber with the optical fiber coding, and the other path is output to the reflector; collecting the light wave signal intensity reflected by the reflector, and calculating the initial light wave signal intensity according to the splitting output ratio of the splitter; calculating the threshold of the optical fiber measurement point using the initial light wave signal intensity and the attenuation coefficient of the optical fiber, wherein the attenuation coefficient is determined by the optical fiber material and the optical fiber length; the threshold of the optical fiber measurement point F1 = F0 / (10^(r / 10)), wherein F0 is defined as the initial light wave signal intensity, and r is the attenuation coefficient of the optical fiber.

2. The optical fiber coding identification system with self-determining measurement threshold according to claim 1, characterized in that: The light source module (100) comprises a driver (110) capable of adjusting output current and a light source (120) driven by the driver (110); the driver (110) is electrically connected to the main controller (800).

3. The optical fiber coding identification system with self-determining measurement threshold according to claim 2, characterized in that: The light source (120) is a narrow bandwidth light source or a pulse light source.

4. The optical fiber coding identification system with self-determining measurement threshold according to claim 2, characterized in that: The light source module (100) further comprises a first SOA optical switch (130) electrically connected to the main controller (800), the first SOA optical switch (130) being connected between the light source (120) and a first port of the circulator (200), the light source (120) being a large bandwidth light source; a second SOA optical switch (140) is arranged between an input end of the waveform detector (700) and a third port of the circulator (200), the second SOA optical switch (140) being electrically connected to the main controller (800).

5. The optical fiber coding identification system with self-determining measurement threshold according to claim 1, characterized in that: The light splitting ratio between the main light splitting end and the auxiliary light splitting end of the light splitter (300) is 99:

1.

6. The optical fiber coding identification system with self-determining measurement threshold according to claim 1, characterized in that: The waveform detector (700) adopts a demodulator to realize light wave separation and wavelength measurement.

7. The optical fiber coding identification system with self-determining measurement threshold according to claim 1, characterized in that: The main controller (800) adopts an FPGA controller.

8. A method for a fiber coding identification system to automatically determine a measurement threshold, applied to the fiber coding identification system according to any one of claims 1 to 7, characterized in that: The following steps are included The optical wave output is divided into two paths by using an optical splitter, one path is output to the optical fiber with optical fiber coding, and the other path is output to the reflector; Collecting the intensity of the light wave signal reflected by the reflector, and calculating the initial light wave signal intensity according to the light splitting output ratio of the light splitter; The threshold of the optical fiber measurement point is calculated using the initial light wave signal intensity and the attenuation coefficient of the optical fiber, wherein the attenuation coefficient is determined by the optical fiber material and the optical fiber length, and the threshold of the optical fiber measurement point is F1=F0 / (10^(r / 10)), wherein F0 is defined as the initial light wave signal intensity and r is the attenuation coefficient of the optical fiber.

9. A method for determining a measurement threshold value by an optical fiber coding identification system according to claim 8, characterized in that: Collecting the intensity of the light wave signal reflected by the reflector includes: Obtain a continuous spectrum of reflectance; Determine the position of the light wave signal reflected by the reflector in the continuous spectrum from the continuous spectrum; The light wave signal intensity of the light wave signal reflected by the reflector in the continuous spectrum is obtained based on the position.

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