CN215222202U - Optical fiber coding identification system of temperature modulation multi-spectral matrix - Google Patents
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Abstract
The utility model discloses an optical fiber coding identification system of temperature modulation multi-spectrum matrix, include: the tunable laser module group consists of a plurality of tunable laser modules with different wavelength bands, and each tunable laser module comprises a light-emitting chip and a temperature modulation device; a wavelength division multiplexer; a circulator; the optical fiber is provided with an optical fiber code; an APD photoelectric collector; an AD acquisition card; and a main controller. In this embodiment, a plurality of tunable laser modules emit light one by one in a round-trip manner, and are matched with 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 device can complete the reflected signal acquisition of a single light source with a central wavelength in the whole process of an optical fiber link at one time, and realize the faster identification of optical fiber codes under the condition of lower cost. The temperature modulation device is combined to act on the light-emitting chip to realize multiple changes of the central wavelength of a single light source, and the identification precision of the optical fiber codes is improved.
Description
Technical Field
The utility model relates to an optical fiber communication field, in particular to optical fiber coding identification system of temperature modulation multi-spectral matrix.
Background
In the field of optical fiber communication, an optical fiber coding is used as a technical means for unique identification of an optical fiber medium and consists of a plurality of optical fiber gratings with different wavelengths, and an optical fiber coding identification system is an optical detection system for accurately identifying the wavelengths of the optical fiber gratings. The existing optical fiber coding and identifying system mainly uses a wavelength detector (AD acquisition card) to have long single acquisition time, the used main light wave is non-communication wavelength, and the bandwidth of the central wavelength light wave emitted by a single laser is too large, so that the identification precision is insufficient.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a temperature modulation multi-spectral matrix's optical fiber code identification system can realize high accuracy and gather reflection signal and optical fiber code discernment fast.
According to the utility model discloses the optical fiber coding identification system of temperature modulation multispectral matrix of first aspect embodiment includes: the tunable laser module group consists of a plurality of tunable laser modules with different wavelength bands, each tunable laser module comprises a light-emitting chip with different wavelength bands and a temperature modulation device, and the temperature modulation device is used for modulating the central wavelength of the light-emitting chip; the input end of the wavelength division multiplexer is respectively connected with the tunable laser modules with different wavelength bands to realize the wavelength coupling of the tunable laser module group; the circulator is provided with a first port, a second port and a third port, and the first port is connected with the output end of the wavelength division multiplexer; the input end of the optical fiber is connected with the second port of the circulator, and the optical fiber is provided with an optical fiber code; the APD photoelectric collector is connected with a third port of the circulator to receive the light wave signal returned by the optical fiber code and convert the light wave signal into a level signal; the AD acquisition card is connected with the output end of the APD photoelectric collector and is used for converting the level signal of the APD photoelectric collector into a digital signal and feeding the digital signal back to the main controller; and the main controller is respectively electrically connected with the tunable laser module group, the APD photoelectric collector and the AD acquisition card and is used for controlling each tunable laser module of the tunable laser module group to emit light in turn so as to realize identification of optical fiber codes.
According to the utility model discloses the optical fiber coding identification system of temperature modulation multispectral matrix of first embodiment has following beneficial effect at least: in the embodiment, a plurality of tunable laser modules with different central wavelengths are used for sequentially emitting light, and a rapid identification module consisting of an APD photoelectric collector and an AD acquisition card is matched, so that the acquisition frequency is more than 40 times of that of a traditional wavelength detector, the reflected signal acquisition of a light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the rapid identification of optical fiber codes is realized under the condition of lower cost; in addition, the temperature modulation device is combined to act on the light emitting chip to realize multiple changes of the central wavelength of a single light source, so that the single light source can send light waves with different central wavelengths, and the identification precision of optical fiber codes is improved.
According to some embodiments of the first aspect of the present invention, the temperature modulation device includes drive control module, temperature sensor and semiconductor refrigeration piece, drive control module respectively with main control unit, light emitting chip, temperature sensor and semiconductor refrigeration piece electric connection, just temperature sensor and semiconductor refrigeration piece all attach in light emitting chip surface.
According to some embodiments of the first aspect of the present invention, the optical fiber encoding identification system of the temperature modulation multi-spectral matrix further comprises an amplifier disposed between the APD photo collector and the AD acquisition card.
According to some embodiments of the first aspect of the present invention, the tunable laser module group employs a DFB laser.
According to some embodiments of the first aspect of the present invention, the main controller employs an FPGA.
According to the utility model discloses the optical fiber coding identification method of temperature modulation multiple spectrum matrix of second aspect embodiment, including following step: s100, outputting a pulse driving command to a first tunable laser module of the tunable laser module group by the main controller, wherein the starting time is t0, and the pulse width is t; each tunable laser module adopts a central wavelength with different sizes and respectively corresponds to different code elements of optical fiber codes; s200, outputting a pulse light wave with a central wavelength to a wavelength division multiplexer, a circulator and an optical fiber to be tested containing an optical fiber code by a first tunable laser module; s300, the master controller controls the APD photoelectric collector to start so as to receive the reflected light wave signals and convert the reflected light wave signals into analog level signals, the starting time is t0, and the reflected light wave signal wavelength and energy collection of the pulse light waves with single central wavelength in the whole process of the optical fiber to be detected is realized; s400, converting the analog level signals collected by the APD photoelectric collector into digital signals by using an AD collection card and feeding the digital signals back to the main controller; s500, calculating the energy value of each point in the optical fiber and the optical fiber coding reflection wavelength corresponding to the first tunable laser module by the main controller according to the acquired digital signals; s600, performing temperature modulation on the first tunable laser module at least twice to change the output center wavelength, and repeating the steps from S100 to S500 to complete the test of the multi-spectral wavelength near the center wavelength of the first code element; and S700, sequentially controlling the rest tunable laser modules to emit light one by one, and repeating the steps from S100 to S600 to collect the wavelengths and the energies corresponding to different code elements, thereby realizing the complete identification of the optical fiber codes.
According to the utility model discloses the optic fibre coding identification method of temperature modulation multispectral matrix of second aspect embodiment has following beneficial effect at least: in the embodiment, a plurality of tunable laser modules with different central wavelengths are used for sequentially emitting light, and a rapid identification module consisting of an APD photoelectric collector and an AD acquisition card is matched, so that the acquisition frequency is more than 40 times of that of a traditional wavelength detector, the reflected signal acquisition of a light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the rapid identification of optical fiber codes is realized under the condition of lower cost; in addition, the temperature modulation device is combined to act on the light emitting chip to realize multiple changes of the central wavelength of a single light source, so that the single light source can send light waves with different central wavelengths, and the identification precision of optical fiber codes is improved.
According to some embodiments of the second aspect of the present invention, the tunable laser module group is composed of a plurality of tunable laser modules, each of whose spectrum is its center wavelength ± 0.5 nm.
According to some embodiments of the second aspect of the present invention, the pulse width t ═ k × t00, where t00 is the reference pulse width and k is a specified coefficient associated with the measured maximum distance.
According to some embodiments of the second aspect of the present invention, the collecting time interval of the APD optoelectronic collector is t11, the collecting time of each collecting point is m × t11, and m is the serial number of the collecting point, wherein t11 ═ t00 × k.
According to some embodiments of the second aspect of the present invention, the temperature difference interval of the temperature modulation is 2 degrees celsius.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of an optical fiber encoding and identifying system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a tunable laser module according to an embodiment of the present invention;
fig. 3 is a flowchart of an optical fiber encoding identification method according to an embodiment of the present invention.
Reference numerals:
tunable laser module group 100, light emitting chip 110, drive control module 120, temperature sensor 130 and semiconductor chilling plate 140
The device comprises a wavelength division multiplexer 200, a circulator 300, an optical fiber 400, an optical fiber code 410, an APD photoelectric collector 500, an AD acquisition card 600, a main controller 700 and an amplifier 800.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, a fiber coding identification system of a temperature-modulated multi-spectral matrix according to an embodiment of the present disclosure includes: the tunable laser module group 100 is composed of a plurality of tunable laser modules with different wavelength bands, each tunable laser module includes a light emitting chip 110 with different wavelength bands and a temperature modulation device, and the temperature modulation device is used for modulating the central wavelength of the light emitting chip; the input end of the wavelength division multiplexer 200 is respectively connected with the tunable laser modules of the plurality of different wavelength bands to realize the wavelength coupling of the tunable laser module group 100; a circulator 300, wherein the circulator 300 has a first port, a second port and a third port, and the first port is connected with the output end of the wavelength division multiplexer 200; the input end of the optical fiber 400 is connected with the second port of the circulator 300, and the optical fiber 400 is provided with an optical fiber code 410; the APD photoelectric collector 500 is connected to the third port of the circulator 300 to receive the optical wave signal transmitted back by the optical fiber code 410 and convert the optical wave signal into a level signal; the AD acquisition card 600 is connected with the output end of the APD photoelectric collector 500 and is used for converting the level signal of the APD photoelectric collector 500 into a digital signal and feeding the digital signal back to the main controller 700; and the main controller 700 is electrically connected with the tunable laser module group 100, the APD photoelectric collector 500 and the AD acquisition card 600 respectively, and is used for controlling each tunable laser module of the tunable laser module group 100 to emit light in turn so as to realize identification of the optical fiber code 410.
The working process is that the main controller 700 controls one tunable laser module of the tunable laser module group 100 to output a high-power pulse optical wave signal with a single central wavelength, and simultaneously starts the APD photoelectric collector 500, the high-power pulse optical wave signal enters the wavelength coupling of the wavelength division multiplexer 200, enters through the first port of the circulator 300, is output to the optical fiber code 410 on the optical fiber 400 through the second port, the optical fiber code 410 returns a reflected and scattered optical wave signal with unique identification characteristics, is subjected to photoelectric conversion to the APD photoelectric collector 500 through the second port of the circulator 300 and the third port of the circulator 300 in sequence, is converted into a digital signal through the AD acquisition card 600, and feeds back to the main controller 700 to identify the code element wavelength and energy of the optical fiber code 400 corresponding to the single central wavelength, and changes the output wavelength of the tunable laser module through temperature modulation, the above process is repeated to improve the recognition accuracy. And then, the tunable laser modules sequentially scan for different high-power pulse light wave signals with different central wavelengths, the temperature modulation is repeated, and other code element wavelengths and energy of the light code 400 are identified, so that a complete light code can be formed.
Because the acquisition frequency of the existing wavelength detector (wavelength demodulator) can only reach 10MHz at most, and a SOA optical switch is needed to realize the pulse control of the received light wave, and because the acquisition rate of the wavelength detector is not enough, the light source can only acquire a small segment of optical fiber once when emitting light, and the acquisition of the whole optical fiber link can be completed only by multiple times of light emission and acquisition, so that the identification efficiency of the whole optical fiber code is low. In the embodiment, a plurality of tunable laser modules with different central wavelengths are used for sequentially emitting light, and the rapid identification module composed of an APD photoelectric collector and an AD acquisition card is matched, so that the maximum frequency can reach 10GHz (400 MHz is selected for saving cost), the acquisition frequency is more than 40 times of that of a traditional wavelength detector, the reflected signal acquisition of a light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the optical fiber codes can be identified more rapidly under the condition of lower cost. In addition, the temperature modulation device is combined to act on the light emitting chip to realize multiple changes of the central wavelength of a single light source, so that the single light source can send light waves with different central wavelengths, and the identification precision of optical fiber codes is improved.
As shown in fig. 2, in some embodiments of the first aspect of the present invention, the temperature modulation device includes a driving control module 120, a temperature sensor 130 and a semiconductor refrigeration piece 140, the driving control module is electrically connected to the main controller 700, the light emitting chip 110, the temperature sensor 130 and the semiconductor refrigeration piece 140, and the temperature sensor 130 and the semiconductor refrigeration piece 140 are both attached to the surface of the light emitting chip 110. The drive control module 120 receives an external instruction, pulse power supply is carried out on the light-emitting chip 110, the light-emitting chip 110 can generate heat after being started, the semiconductor refrigerating piece 140 is responsible for cooling, the drive control module 120 receives the temperature acquired by the surface mount type temperature sensor 130 to adjust the semiconductor refrigerating piece 140 to cool, the light-emitting chip is controlled to be at a required temperature, the wavelength of the light-emitting chip changes along with the temperature change, and the light-emitting chip is basically kept at 0.1 nm/degree centigrade through a large number of tests.
In some embodiments of the first aspect of the present invention, the optical fiber coding identification system of the temperature modulation multi-spectral matrix further comprises an amplifier 800 disposed between the APD photoelectric collector 500 and the AD acquisition card 600, so as to amplify the level signal of the APD photoelectric collector and improve the detection distance.
In view of the volume and performance requirements, in some embodiments of the first aspect of the present invention, the tunable laser module set 100 employs a DFB laser.
In some embodiments of the first aspect of the present invention, the main controller 700 employs an FPGA. On one hand, the round training pulse driving and the power control of the tunable laser module are realized, and on the other hand, the data acquisition of the AD acquisition module is realized; the difference between the light-emitting time of the tunable laser module and the time of the acquisition point of the APD photoelectric acquisition device 500 can be realized to calculate the length of the optical fiber of the acquisition point; the FPGA main controller calculates the voltage and current required by the light intensity of the light source and the required pulse time, supplies power to the light source, the light source emits light and then inputs the light into an optical fiber code through a wavelength division multiplexer, a circulator and an optical fiber, backward reflected light in the optical fiber enters an APD photoelectric collector through the circulator to be converted into an analog electric signal, the analog electric signal is amplified by an amplifier and then inputs the analog electric signal into an AD acquisition module, the AD acquisition module continuously acquires the data information of the AD acquisition module according to the acquisition frequency, the FPGA main controller starts to acquire the data information of the AD acquisition module after driving the light source, the data information comprises energy and time, so that the light emission and the acquisition of the wavelength of a single light source are completed, and the FPGA main controller calculates the energy value of each point in the optical fiber and the optical fiber code reflection wavelength corresponding to the light source according to the acquired energy and time signals; the optical fiber codes corresponding to the central wavelengths are collected after the light sources with different central wavelengths are output, and the optical fiber codes are combined by using the current positions of the distances of the optical fiber codes, so that the complete collection of the optical fiber codes is realized.
As shown in fig. 3, a method for identifying an optical fiber code of a temperature-modulated multi-spectral matrix according to an embodiment of the second aspect of the present invention includes the following steps:
s100, outputting a pulse driving command to a first tunable laser module of the tunable laser module group by the main controller, wherein the starting time is t0, and the pulse width is t; each tunable laser module adopts a central wavelength with different sizes and respectively corresponds to different code elements of optical fiber codes;
s200, outputting a pulse light wave with a central wavelength to a wavelength division multiplexer, a circulator and an optical fiber to be tested containing an optical fiber code by a first tunable laser module;
s300, the master controller controls the APD photoelectric collector to start so as to receive the reflected light wave signals and convert the reflected light wave signals into analog level signals, the starting time is t0, and the reflected light wave signal wavelength and energy collection of the pulse light waves with single central wavelength in the whole process of the optical fiber to be detected is realized;
s400, converting the analog level signals collected by the APD photoelectric collector into digital signals by using an AD collection card and feeding the digital signals back to the main controller;
s500, calculating the energy value of each point in the optical fiber and the optical fiber coding reflection wavelength corresponding to the first tunable laser module by the main controller according to the acquired digital signals;
s600, performing temperature modulation on the first tunable laser module at least twice to change the output center wavelength, and repeating the steps from S100 to S500 to complete the test of the multi-spectral wavelength near the center wavelength of the first code element;
and S700, sequentially controlling the rest tunable laser modules to emit light one by one, and repeating the steps from S100 to S600 to collect the wavelengths and the energies corresponding to different code elements, thereby realizing the complete identification of the optical fiber codes.
In the embodiment, a plurality of tunable laser modules with different central wavelengths are used for sequentially emitting light, and a rapid identification module consisting of an APD photoelectric collector and an AD acquisition card is matched, so that the acquisition frequency is more than 40 times of that of a traditional wavelength detector, the reflected signal acquisition of a light source with a single central wavelength in the whole process of an optical fiber link can be completed at one time, and the rapid identification of optical fiber codes can be realized under the condition of lower cost. In addition, the temperature modulation device is combined to act on the light emitting chip to realize multiple changes of the central wavelength of a single light source, so that the single light source can send light waves with different central wavelengths, and the identification precision of optical fiber codes is improved.
In some embodiments of the second aspect of the present invention, the tunable laser module group is composed of a plurality of tunable laser modules, the spectrum of each tunable laser module is the central wavelength ± 0.5nm, and the central wavelength interval between two adjacent tunable laser modules is 1 nm; the LED lamp is directly controlled by an FPGA main controller, and light intensity and pulse modulation light emission are carried out one by one.
In some embodiments of the second aspect of the present invention, the pulse width t ═ k × t00, where t00 is the reference pulse width and k is a specified coefficient associated with the measured maximum distance.
In some embodiments of the second aspect of the present invention, the collecting time interval of the APD photoelectric collector is t11, the collecting time of each collecting point is m × t11, m is the collecting point sequence number, wherein t11 ═ t00 × k, wherein t11 directly affects the collecting precision, and the smaller the value, the higher the collecting precision.
In some embodiments of the second aspect of the present invention, the tunable laser module is based on 25 degrees at normal temperature, the center wavelength thereof is stabilized at a certain value, 1 degree of the center wavelength thereof is increased to change 0.1nm, the same tunable laser module realizes the output of a plurality of center wavelengths, the existing 1nm wavelength interval precision is improved to 0.1nm or 0.2nm, and the interval is preferably 0.2nm through actual testing and calculation. For this purpose, the temperature adjustment of the tunable laser module is based on 2 degrees.
The FPGA main controller sends a 25-degree pulse light-emitting instruction to the 1 st tunable laser module, the 1 st tunable laser module controls the temperature to carry out pulse light-emitting at 25 degrees, after the FPGA receives AD acquisition module data, the FPGA sends a 27-degree pulse light-emitting instruction to the 1 st tunable laser module, AD acquisition is carried out for the 2 nd time, the same tunable laser module changes 3 times of temperature light-emitting and AD data acquisition under the same temperature condition, and the light-emitting precision can be improved to 0.2nm precision.
By analogy, the rotation training luminescence and AD data of n tunable laser modules can be realized, the measurable wavelength precision can be improved to 0.2nm, and if the temperature is adjusted to 1-degree interval, the wavelength progress can be improved to 0.1 nm;
in the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A fiber optic coded identification system for a temperature modulated multi-spectral matrix, comprising: comprises that
The tunable laser module group (100) is composed of a plurality of tunable laser modules with different wavelength bands, each tunable laser module comprises a light-emitting chip (110) with different wavelength bands and a temperature modulation device, and the temperature modulation device is used for modulating the central wavelength of the light-emitting chip;
the input end of the wavelength division multiplexer (200) is respectively connected with the tunable laser modules of the plurality of different wavelength bands to realize the wavelength coupling of the tunable laser module group (100);
a circulator (300), wherein the circulator (300) is provided with a first port, a second port and a third port, and the first port is connected with the output end of the wavelength division multiplexer (200);
the input end of the optical fiber (400) is connected with the second port of the circulator (300), and an optical fiber code (410) is arranged on the optical fiber (400);
the APD photoelectric collector (500) is connected with a third port of the circulator (300) to receive the light wave signal returned by the optical fiber code (410) and convert the light wave signal into a level signal;
the AD acquisition card (600) is connected with the output end of the APD photoelectric collector (500) and is used for converting the level signal of the APD photoelectric collector (500) into a digital signal and feeding the digital signal back to the main controller (700);
and the main controller (700) is electrically connected with the tunable laser module group (100), the APD photoelectric collector (500) and the AD acquisition card (600) respectively and is used for controlling each tunable laser module of the tunable laser module group (100) to emit light in turn so as to realize the identification of the optical fiber codes (410).
2. The system according to claim 1, wherein the optical fiber encoding identification system comprises: the temperature modulation device comprises a drive control module (120), a temperature sensor (130) and a semiconductor refrigeration piece (140), wherein the drive control module is electrically connected with the main controller (700), the light-emitting chip (110), the temperature sensor (130) and the semiconductor refrigeration piece (140), and the temperature sensor (130) and the semiconductor refrigeration piece (140) are attached to the surface of the light-emitting chip (110).
3. The system according to claim 1, wherein the optical fiber encoding identification system comprises: the APD photoelectric collector further comprises an amplifier (800) arranged between the APD photoelectric collector (500) and the AD acquisition card (600).
4. The system according to claim 1, wherein the optical fiber encoding identification system comprises: the tunable laser module group (100) adopts a DFB laser.
5. The system according to claim 1, wherein the optical fiber encoding identification system comprises: the main controller (700) adopts an FPGA.
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