A fiber optic coding identification system and method with multi-wavelength synchronous output

Abstract

The present invention discloses a fiber coding identification system and method with multi-wavelength synchronous output, the system comprising: a high-power pulse light source group; a wavelength division multiplexer, respectively connected to the high-power pulse light source to achieve wavelength coupling of the high-power pulse light source group; a circulator, the first port of which is connected to the output end of the wavelength division multiplexer; an optical fiber, on which optical fiber coding is arranged; a modem, connected to the third port of the circulator to receive the optical wave signal returned by the optical fiber coding; a wavelength demodulator, connected to the output end of the modem; a main controller, respectively electrically connected to the high-power pulse light source group, the modem, and the wavelength demodulator to realize the identification of the optical fiber coding. This embodiment selects a plurality of high-power pulse light sources of different wavelength bands as light sources, and then uses a wavelength division multiplexer to couple and become a wide-spectrum light wave, thereby realizing the output of a high-power, large-bandwidth pulse light source, and can detect long-distance optical fiber coding.

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 multi-wavelength synchronous output. 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 gratings of different wavelengths. The optical fiber coding identification system is an optical detection system that accurately identifies the wavelength of its optical fiber grating. The existing optical fiber coding identification system mainly uses a wide spectrum light source, which has the disadvantages of not being able to form pulsed light waves and low light intensity. 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 coding identification system and method with multi-wavelength synchronous output, which can realize the output of high-power and high-bandwidth pulse light sources.

[0004] According to the first aspect of the present invention, a multi-wavelength synchronous output optical 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 achieve 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; a modem, connected to the third port of the circulator to receive an optical wave signal returned by the optical fiber coding to achieve pulse modulation of the optical wave signal; a wavelength demodulator, connected to the output end of the modem for wavelength and energy collection of the optical wave input to the modem; and a main controller, electrically connected to the high-power pulse light source group, the modem, and the wavelength demodulator, respectively, to achieve optical fiber coding identification.

[0005] The optical fiber coding identification system with multi-wavelength synchronous output according to the first embodiment of the present invention has at least the following beneficial effects: This embodiment selects a plurality of high-power pulse light sources in different wavelength bands as light sources, and then uses a wavelength division multiplexer to couple them and turn them into wide-spectrum light waves, thereby realizing the output of high-power, high-bandwidth pulse light sources, and can detect long-distance optical fiber coding.

[0006] According to some embodiments of the first aspect of the present invention, the multi-wavelength synchronous output optical fiber coding identification system also includes a digital power supply control module connected to the main controller, and the digital power supply control module is respectively connected to the multiple high-power pulse light sources in different wavelength bands to control input current and voltage.

[0007] According to some embodiments of the first aspect of the present invention, the digital power supply control module and the multiple high-power pulse light sources in different wavelength bands are both connected to a digital control module.

[0008] Some embodiments according to the first aspect of the present invention further include an amplifier arranged between the modem and the third port of the circulator.

[0009] According to some embodiments of the first aspect of the present invention, the high-power pulse light source group uses a DFB laser.

[0010] According to some embodiments of the first aspect of the present invention, the main controller adopts FPGA.

[0011] According to a second aspect of the present invention, a method for identifying optical fiber codes with synchronous output of multiple wavelengths comprises the following steps: a main controller outputs a pulse drive instruction to a high-power pulse light source group, with a start time of t0 and a pulse width of t; the high-power pulse light source group outputs high-power pulse light waves of different wavelength bands to a wavelength division multiplexer for coupling and becoming wide-spectrum light waves; the coupled wide-spectrum light waves enter the optical fiber to be tested containing the optical fiber code through a circulator; the main controller controls the modem to start to receive the reflected light wave signal, with a start time of t1, wherein t1=t0+n*t00, n is a given variable, and t00 is a reference pulse width; a wavelength demodulator is used to identify the wavelength and energy of the reflected light wave signal, and the results are fed back to the main controller; the main controller adjusts the size of n to achieve segment-by-segment scanning of the optical fiber to be tested.

[0012] The optical fiber coding identification method with multi-wavelength synchronous output according to the second aspect of the present invention has at least the following beneficial effects: This embodiment selects a plurality of high-power pulse light sources in different wavelength bands as light sources, and then uses a wavelength division multiplexer to couple them and turn them into wide-spectrum light waves, thereby realizing the output of high-power, high-bandwidth pulse light sources, and can detect long-distance optical fiber coding.

[0013] 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 narrow-spectrum high-power pulse light sources, the spectrum of each of the narrow-spectrum high-power pulse light sources is ±0.5 nm of its central wavelength, and the plurality of narrow-spectrum high-power pulse light sources constitute a complete spectrum segment.

[0014] According to some embodiments of the second aspect of the present invention, the main controller provides current and voltage signals to the high-power pulse light source group through a digital power supply control module, and adjusts the current and voltage of the corresponding high-power pulse light source according to the wavelength and energy of the identified reflected light wave signal, so that the output energy of each of the high-power pulse light sources is consistent.

[0015] According to some embodiments of the second aspect of the present invention, a numerical control module is arranged between the digital power supply control module and the high-power pulse light source, clock synchronization is set between the digital power supply control module and the numerical control module, and the digital power supply control module is used as a clock synchronization reference.

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

[0019] Figure 2 The figure is a flow chart of a fiber coding identification method according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 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, a modem 500, a wavelength demodulator 600, a main controller 700, a digital power supply control module 800, and an amplifier 900. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] refer to Figure 1As shown, a multi-wavelength synchronous output optical fiber 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 in different wavelength bands; a wavelength division multiplexer 200, whose input ends 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 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 circulator The optical fiber 400 is connected to the second port of the circulator 300, and the optical fiber code 410 is arranged on the optical fiber 400; the modem 500 is connected to the third port of the circulator 300 to receive the light wave signal returned by the optical fiber code 410 to realize pulse modulation of the light wave signal; the wavelength demodulator 600 is connected to the output end of the modem 500 to collect the wavelength and energy of the light wave input to the modem 500; the main controller 700 is electrically connected to the high-power pulse light source group 100, the modem 500, and the wavelength demodulator 600 respectively to realize the recognition of the optical fiber code 410.

[0026] The working process is as follows: the high-power pulse light source group 100 outputs a plurality of high-power pulse light wave signals of different wavelength bands, and the high-power pulse light wave signals enter the wavelength division multiplexer 200 to realize the wavelength coupling of the high-power pulse light source group, forming a wide-spectrum high-power pulse light wave, entering through the first port of the circulator 300 and outputting through the second port to the fiber coding 410 on the optical fiber 400, and 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 modem 500 for pulse modulation, and the wavelength demodulator 600 can detect the reflected and scattered light wave signals, and feed back to the main controller 700 to identify the wavelength and energy of the fiber coding 400.

[0027] Since existing devices do not have a large-bandwidth modem, it is impossible to directly use a high-power light source in conjunction with a modem to achieve high-bandwidth and high-power pulse output. Therefore, this embodiment selects multiple high-power pulse light sources in different wavelength bands as light sources, and then uses a wavelength division multiplexer to couple them and become wide-spectrum light waves, thereby achieving the output of high-power, high-bandwidth pulse light sources, which can detect long-distance optical fiber coding.

[0028] In some embodiments of the first aspect of the present invention, the multi-wavelength synchronous output fiber optic coding identification system also includes a digital power supply control module 800 connected to the main controller 700, and the digital power supply control module 800 is respectively connected to the multiple high-power pulse light sources in different wavelength bands to control the input current and voltage, thereby realizing output light intensity control and pulse light emission of the high-power pulse light source group.

[0029] In some embodiments of the first aspect of the present invention, the digital power supply control module 800 and the high-power pulse light sources of the multiple different wavelength bands are both connected to a numerical control module, clock synchronization is set between the digital power supply control module 800 and the numerical control module, and the digital power supply control module 800 is used as a clock synchronization reference. Optionally, the digital power supply control module 800 is a RAM control chip, and the numerical control module is an integrated numerical control power supply module.

[0030] Since the echo signal is weak, some embodiments of the first aspect of the present invention further include an amplifier 900 arranged between the modem 500 and the third port of the circulator 300. Adding the amplifier 900 can amplify the echo signal, increase the detection distance, and facilitate the detection of long-distance optical fiber coding.

[0031] In view of the volume and performance requirements, a high-power narrow-band pulse light source is used. In some embodiments of the first aspect of the present invention, the high-power pulse light source group 100 adopts a DFB laser.

[0032] In some embodiments of the first aspect of the present invention, the main controller 700 adopts FPGA.

[0033] like Figure 2 As shown, a method for optical fiber coding identification with multi-wavelength synchronous output according to the second aspect of the present invention is provided, comprising the following steps:

[0034] The main controller outputs a pulse drive instruction to the high-power pulse light source group, with the start time being t0 and the pulse width being t, where t=k*t00, t is a specified coefficient associated with the maximum distance measured;

[0035] The high-power pulse light source group outputs high-power pulse light waves of different wavelength bands to the wavelength division multiplexer for coupling and becomes a wide-spectrum light wave;

[0036] The coupled wide spectrum light wave enters the optical fiber to be tested containing the optical fiber coding through the circulator;

[0037] The modem is controlled by the main controller to start receiving the reflected light wave signal, and the start time is t1, where t1=t0+n*t00, n is a given variable, and t00 is the reference pulse width; the length of the optical fiber segment measured each time is l0=t*c*r, where c is the speed of light, r is the group refractive index, and the distance of the optical fiber segment from the starting point is L0=(t1-t0)*c*r / 2;

[0038] The wavelength and energy of the reflected light wave signal are identified by a wavelength demodulator and fed back to the main controller; the main controller realizes the segment-by-segment scanning of the optical fiber to be tested by adjusting the size of n, such as n=n+1, n is less than nt, nt=the specified maximum measurement length Lt / (c*r), n gradually increases from 1 to nt, thereby realizing the segment-by-segment scanning of the entire optical fiber.

[0039] Since existing devices do not have a large-bandwidth modem, it is impossible to directly use a high-power light source in conjunction with a modem to achieve high-bandwidth and high-power pulse output. Therefore, this embodiment selects multiple high-power pulse light sources in different wavelength bands as light sources, and then uses a wavelength division multiplexer to couple them and become wide-spectrum light waves, thereby achieving the output of high-power, high-bandwidth pulse light sources, which can detect long-distance optical fiber coding.

[0040] Due to the lack of traditional high-power, large-bandwidth light sources, the existing light sources covering 80nm can basically only reach 10mW. In some embodiments of the second aspect of the present invention, the high-power pulse light source group is composed of multiple narrow-spectrum high-power pulse light sources, and the spectrum of each narrow-spectrum high-power pulse light source is ±0.5nm of its central wavelength. Multiple narrow-spectrum high-power pulse light sources form a complete spectrum segment.

[0041] The existing large-bandwidth light source is not flat enough, with a large middle and small sides. For the same pulse, the fiber code of the middle wavelength can reflect energy, while the two sides cannot. If the pulse is increased or the output light intensity is increased, the middle part will exceed the maximum energy threshold of the wavelength demodulator; therefore, in some embodiments of the second aspect of the present invention, the main controller provides current and voltage signals to the high-power pulse light source group through a digital power supply control module, and adjusts the current and voltage of the corresponding high-power pulse light source according to the wavelength and energy of the identified reflected light wave signal, so that the output energy of each high-power pulse light source is consistent. It is possible to use light sources with different central wavelengths to form a completely flat large-bandwidth light source, and the overall flatness can be achieved by adjusting the light sources with different central wavelengths, so that the light intensity received by the fiber code of each different central wavelength is consistent. The flatter the light source, the better, which can avoid the fiber code of the middle wavelength being recognizable while the two sides cannot be recognizable. After flattening, for the same pulse, the energy returned by the middle and the two sides is consistent.

[0042] In some embodiments of the second aspect of the present invention, a numerical control module is arranged between the digital power supply control module and the high-power pulse light source respectively, clock synchronization is set between the digital power supply control module and the numerical control module, and the digital power supply control module is used as the clock synchronization reference to synchronously realize the synchronous turning on and off of multiple high-power pulse light sources.

[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 identification system with multi-wavelength synchronous output, 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); A modem (500) connected to the third port of the circulator (300) to receive the optical wave signal returned by the optical fiber encoding (410) to achieve pulse modulation of the optical wave signal; A wavelength demodulator (600) connected to the output end of the modem (500) for collecting the wavelength and energy of the light wave input to the modem (500); The main controller (700) is electrically connected to the high-power pulse light source group (100), the modem (500), and the wavelength demodulator (600) respectively to realize the recognition of the optical fiber code (410).

2. The optical fiber coding identification system with multi-wavelength synchronous output according to claim 1, characterized in that: It also comprises a digital power supply control module (800) connected to the main controller (700), wherein the digital power supply control module (800) is respectively connected to the plurality of high-power pulse light sources in different wavelength bands to control input current and voltage.

3. The optical fiber coding identification system with multi-wavelength synchronous output according to claim 2, characterized in that: The digital power supply control module (800) and the multiple high-power pulse light sources in different wavelength bands are both connected to a digital control module.

4. The optical fiber coding identification system with multi-wavelength synchronous output according to claim 1, characterized in that: Also included is an amplifier (900) disposed between the modem (500) and the third port of the circulator (300).

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

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

7. A method for optical fiber coding identification with multi-wavelength synchronous output, applied to the optical fiber coding identification system with multi-wavelength synchronous output as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: The main controller outputs a pulse drive instruction to the high-power pulse light source group, with the start time being t0 and the pulse width being t; The high-power pulse light source group outputs high-power pulse light waves of different wavelength bands to the wavelength division multiplexer for coupling and becomes wide-spectrum light waves; The coupled wide spectrum light wave enters the optical fiber to be tested containing the optical fiber coding through the circulator; The main controller controls the modem to start up to receive the reflected light wave signal, and the start time is t1, where t1=t0+n*t00, n is a given variable, and t00 is the reference pulse width; Using a wavelength demodulator to identify the wavelength and energy of the reflected light wave signal, and feeding back to the main controller; The main controller adjusts the size of n to achieve segment-by-segment scanning of the optical fiber to be tested.

8. The optical fiber coding identification method with multi-wavelength synchronous output according to claim 7, characterized in that: The high-power pulse light source group is composed of a plurality of narrow-spectrum high-power pulse light sources, the spectrum of each narrow-spectrum high-power pulse light source is ±0.5nm of its central wavelength, and the plurality of narrow-spectrum high-power pulse light sources form a complete spectrum segment.

9. The optical fiber coding identification method with multi-wavelength synchronous output according to claim 7, characterized in that: The main controller provides current and voltage signals to the high-power pulse light source group through a digital power supply control module, and adjusts the current and voltage of the corresponding high-power pulse light source according to the wavelength and energy of the identified reflected light wave signal, so that the output energy of each high-power pulse light source is consistent.

10. The optical fiber coding identification method with multi-wavelength synchronous output according to claim 9, characterized in that: A numerical control module is provided between the digital power supply control module and the high-power pulse light source respectively, clock synchronization is provided between the digital power supply control module and the numerical control module, and the digital power supply control module is used as a clock synchronization reference.

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