CN115396037A - A multi-wavelength interval DFB array light source, optical fiber code demodulation system and method - Google Patents

Abstract

The invention discloses a DFB array light source with multiple wavelength intervals, an optical fiber code demodulation system and a method. The DFB light source includes: a base; and at least two light source groups formed on the base, each light source group has multiple different wavelengths The light sources, and the light sources all have temperature modulation units to achieve non-overlapping wavelength bands; multiple wavelength bands of the light source group form continuous wavelength ranges; at least two wavelength coupling modules are used to couple the corresponding multiple wavelength bands of the light source group output of a light source; waveguide couplers are respectively connected to the output ends of different wavelength coupling modules. This scheme uses the modulation change between the temperature change of the light source and the wavelength, directly uses the temperature modulation to change the output wavelength of the light source, so that one light source can cover a wider band, and two or more light source components are interleaved wavelength coupling, which can make up for The gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer realizes the adjustable light source covering the whole wavelength range.

Description

A multi-wavelength interval DFB array light source, optical fiber code demodulation system and method

technical field

The invention relates to the field of optical fiber communication, in particular to a multi-wavelength interval DFB array light source, an optical fiber code demodulation system and method.

Background technique

Conventional multi-light sources are combined to form an adjustable light source to realize optical fiber code demodulation. Optical switches, two-two Y couplers, AWG (arrayed waveguide gratings) or dense wavelength division multiplexers are mainly used for coupling, but the switching of optical switches is slow and very slow. It is difficult to achieve the required ms level, the attenuation of two Y couplers after coupling under multiple light sources is too large, and the wavelength interval of AWG or dense wavelength division multiplexer coupling cannot be fully covered.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a light source based on a multi-wavelength interval DFB array, which can reduce attenuation and fully cover the program wavelength interval; the present invention also provides an optical fiber code demodulation system and method to realize the demodulation of optical fiber code .

A multi-wavelength spaced DFB array light source according to an embodiment of the first aspect of the present invention, comprising: a base; and formed on the base: at least two light source groups, each of which has a plurality of light sources with different wavelengths A light source, and the light sources all have a temperature modulation unit to achieve non-overlapping wavelength bands; multiple wavelength bands of the light source group form a continuous wavelength range; at least two wavelength coupling modules, and the number of the light source groups Consistent, for coupling multiple light source outputs corresponding to the light source group; waveguide couplers, respectively connected to the output ends of different wavelength coupling modules.

According to the first embodiment of the present invention, a multi-wavelength spaced DFB array light source has at least the following beneficial effects: This solution uses the modulation change between the temperature change of the light source and the wavelength, and directly uses temperature modulation to change the output wavelength of the light source, so that a The light source can cover a wider wavelength band, so that on the one hand, the quantity cost of the light source can be reduced. On the other hand, when multiple light sources are used, only a temperature sensor and a low-cost light intensity detection device are required. The temperature signal of the temperature sensor can be determined by temperature-wavelength The relationship matches the wavelength of the light source, and the light intensity detection device separately measures the light wave energy. In addition, the interleaved wavelength coupling of two or more light source components can make up the gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer, and realize the adjustable light source covering the whole wavelength range.

According to some embodiments of the first aspect of the present invention, the light source is a narrow-wave light source, and the length of the wavelength segment is 4 nanometers.

According to some embodiments of the first aspect of the present invention, the wavelength coupling module is a dense wavelength division multiplexer.

According to some embodiments of the first aspect of the present invention, the wavelength coupling module is an arrayed waveguide grating.

According to some embodiments of the first aspect of the present invention, SOA optical switches are arranged between the output terminals of different wavelength coupling modules and the waveguide couplers.

According to some embodiments of the first aspect of the present invention, the waveguide coupler is a Y-structure coupler.

According to some embodiments of the first aspect of the present invention, the output end of the waveguide coupler is connected with an optical fiber lead-out groove formed on the edge of the substrate.

According to some embodiments of the first aspect of the present invention, the substrate is a silicon substrate.

An optical fiber coding and demodulation system according to a second embodiment of the present invention, comprising

The multi-wavelength spaced DFB array light source as described is used to output light waves of different wavelengths;

A circulator, the first end of the circulator is connected to the output end of the multi-wavelength interval DFB array light source through an optical fiber, and the second end of the circulator is used to connect the optical fiber code to be demodulated through an optical fiber;

APD photoelectric conversion unit, connected to the third end of the circulator, to receive and convert the light wave reflected by the optical fiber code;

AD high-speed acquisition unit, connected with the APD photoelectric conversion unit, for collecting the light wave signal converted by the APD photoelectric conversion unit;

The high-speed control module is electrically connected to the multi-wavelength interval DFB array light source and the AD high-speed acquisition unit respectively, and is used to control the light wave output of the multi-wavelength interval DFB array light source and receive the light wave transmitted by the AD high-speed acquisition unit signal, and analyze the central wavelength combination, reflected energy, and distance of the optical fiber code according to the light wave signal transmitted by the AD high-speed acquisition unit.

According to the second aspect of the present invention, an optical fiber code demodulation system has at least the following beneficial effects: This solution uses the modulation change between the temperature change of the light source and the wavelength, and directly uses the temperature modulation to change the output wavelength of the light source, so that a The light source can cover a wider wavelength band, so that on the one hand, the quantity cost of the light source can be reduced. On the other hand, when multiple light sources are used, only a temperature sensor and a low-cost light intensity detection device are required. The temperature signal of the temperature sensor can be determined by temperature-wavelength The relationship matches the wavelength of the light source, and the light intensity detection device separately measures the light wave energy. And two or more light source components are interleaved wavelength coupling, which can make up the gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer, and realize the adjustable light source with full coverage of the wavelength range, which is more conducive to the realization of low-cost Optical fiber code demodulation.

An optical fiber coding and demodulation method according to the embodiment of the third aspect of the present invention is applied to the above-mentioned optical fiber coding and demodulation system, and the optical fiber coding and demodulation method includes:

The high-speed control module controls the multi-wavelength spaced DFB array light source, so that a single light source emits a stable central wavelength light wave;

The light wave enters the optical fiber code through the circulator, and the optical fiber code reflects the corresponding wavelength, and is collected by the APD photoelectric conversion unit through the circulator and converted into an electrical signal;

When the high-speed control module controls the light source to send pulsed light waves, it simultaneously performs high-speed acquisition on the AD high-speed acquisition unit;

Control the light source to send light waves with different central wavelengths, and finally form a data group with wavelength as the coordinate;

According to the collected time point, the high-speed control module forms a three-dimensional data group with X coordinate, wavelength as Y coordinate, and energy as vertical coordinate. The data at the same time point is the reflection of the same optical fiber code, and finally calculates the center wavelength and reflection energy according to the energy difference. Calculate the distance at the time point, and finally form the central wavelength combination, reflected energy, and distance of the optical fiber code.

According to the third aspect of the present invention, an optical fiber code demodulation method has at least the following beneficial effects: This solution uses the modulation change between the temperature change of the light source and the wavelength, and directly uses temperature modulation to change the output wavelength of the light source, so that a The light source can cover a wider wavelength band, so that on the one hand, the quantity cost of the light source can be reduced. On the other hand, when multiple light sources are used, only a temperature sensor and a low-cost light intensity detection device are required. The temperature signal of the temperature sensor can be determined by temperature-wavelength The relationship matches the wavelength of the light source, and the light intensity detection device separately measures the light wave energy. And two or more light source components are interleaved wavelength coupling, which can make up the gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer, and realize the adjustable light source with full coverage of the wavelength range, which is more conducive to the realization of low-cost Optical fiber code demodulation.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic diagram of a multi-wavelength spaced DFB array light source of an embodiment of the first aspect of the present invention;

2 is a cross-sectional structure diagram of a multi-wavelength spaced DFB array light source according to the first embodiment of the present invention;

FIG. 3 is a schematic diagram of an optical fiber coding and demodulation system according to an embodiment of the second aspect of the present invention;

Figure 4a, Figure 4b, and Figure 4c are schematic diagrams of different types of optical fiber encoding;

Fig. 5 is a flow chart of an optical fiber code demodulation method according to an embodiment of the third aspect of the present invention.

Reference signs:

Multi-wavelength interval DFB array light source 100, substrate 110, light source group 120, light source 121, temperature modulation unit 122, grating 123, wavelength coupling module 130, waveguide coupler 140, SOA optical switch 150, optical fiber lead-out groove 160,

circulator 200,

APD photoelectric conversion unit 300,

AD high-speed acquisition unit 400,

High-speed control module 500,

Fiber code 600.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for 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 descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it 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 otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

Referring to Fig. 1 and Fig. 2, it is a multi-wavelength interval DFB array light source 100 according to the first embodiment of the technical solution, including: a substrate 110; and formed on the substrate 110: two light source groups 120 or more Light source groups 120, each light source group 120 has a plurality of light sources 121 with different wavelengths, and the light sources 121 all have temperature modulation units 122 to achieve non-overlapping wavelength segments; multiple wavelength segments of the light source groups 120 form continuous wavelengths interval; two wavelength coupling modules 130 or multiple wavelength coupling modules 130, which are consistent with the number of light source groups 120, are used to couple the output of multiple light sources 121 of the corresponding light source group 120; waveguide couplers 140 are respectively connected to different wavelength coupling modules 130 output connection.

Among them, each light source uses the temperature modulation unit 122 to increase the wavelength by a maximum of 4.2nm, that is, to meet the requirements of 0.1nm/degree. From 20-62 degrees, it fully meets the working requirements of the light source chip. The overall coverage of multiple light sources is 1510-1590nm. Realize gapless coverage, for example, in the first light source group 120, there are 1510, 1518, 1526, 1534, using temperature modulation 4nm, it can cover different wavelengths such as 1510-1514, 1518-1522, 1526-1530, 1534-1538nm 1512±2, 1520±2, 1528±2, 1536±2 can be selected for its dense wavelength division; in the second light source group 120, there are 1514, 1522, 1530, using temperature modulation 4nm, it can cover 1514- For different wavelength bands such as 1518, 1522-1526, 1530-1534, etc., the dense wavelength division can be selected as 1516±2, 1524±2, 1532±2; in this way, the two groups of light sources can be combined to cover 1510-1538nm, and at the same time, it can meet the requirement of dense wavelength Gaps brought by the sub-wavelength filling. Finally, the output of the two wavelength coupling modules 130 is coupled using a Y structure, and the attenuation of the optical fiber is reduced again. If the wavelength gap of dense wavelength division is wider, the number of light source groups 120 needs to be increased.

As shown in Figure 2, the light source 121 is provided with a grating 123 on the illuminant, and each light source has a grating 123 with a different wavelength to select the wavelength. The temperature of the grating 123 can be changed, and then the wavelength of the output light wave can be changed, so as to realize the temperature modulation of the output wavelength of the light source. Specifically, control the temperature at the required temperature to modulate the increase in the wavelength of the light source, basically according to 0.1nm/degree, for example, the wavelength of the light source 121 at 20 degrees is 1520.00nm, we need 1521. Adjust to 30 degrees to emit a wavelength of 1521.00nm.

This solution uses the modulation change between the temperature change of the light source and the wavelength, directly uses the temperature modulation to change the output wavelength of the light source, so that a light source can cover a wider band, so that on the one hand, the quantity cost of the light source can be reduced; When the light source is used, only a temperature sensor and a low-cost light intensity detection device are required. The temperature signal of the temperature sensor can match the wavelength of the light source with the temperature-wavelength relationship, and the light intensity detection device measures the light wave energy alone. In addition, two or more light source groups are coupled with 120 points of interleaved wavelengths, which can make up the gap between adjacent wavelength bands of traditional dense wavelength division multiplexers, and realize an adjustable light source that covers a full range of wavelengths.

It can be seen that this solution is aimed at: the dense wavelength division technology mainly realizes the convergence of multiple wavelength bands, but there is a certain gap between adjacent wavelength bands, which requires at least two or more dense wavelength division staggered wavelength bands, The complete wavelength coverage can only be completed by superimposing each other, which is the main inventive idea of this solution.

In some embodiments of the first aspect of the present invention, the wavelength coupling module 130 is a dense wavelength division multiplexer.

In some embodiments of the first aspect of the present invention, the wavelength coupling module 130 is an arrayed waveguide grating to replace a dense wavelength division multiplexer, both of which are applicable to this solution, wherein the arrayed waveguide grating can be directly processed on a silicon chip , so it is more preferable.

Considering the problem of light intensity weakening after light wave coupling, as shown in FIG. 1, in some embodiments of the first aspect of the present invention, SOA light The switch 150 has a certain amplification effect. In view of the limitation of the wavelength width covered by the SOA optical switch 150, the SOA optical switch 150 is placed behind the wavelength coupling module 130 to increase the light intensity.

In some embodiments of the first aspect of the present invention, the waveguide coupler 140 is a Y-structure coupler. Although there is a certain attenuation, compared with all light sources using Y-structure couplers to couple two by two, the Y structure of this technical solution Structural couplers use a very small proportion, which can greatly reduce attenuation.

In order to facilitate the connection of external devices, in some embodiments of the first aspect of the present invention, the output end of the waveguide coupler 140 is connected with an optical fiber lead-out groove 160 formed on the edge of the base 110 to facilitate light wave output.

In some embodiments of the first aspect of the present invention, the substrate 110 is a silicon substrate, and the light source, temperature modulation unit 122, wavelength coupling module 130, SOA optical switch 150, and waveguide coupling are processed directly on the silicon substrate using techniques such as holographic exposure. The device 140 can realize the chip of the DFB light source, and the structure is more compact and the cost is greatly reduced. It should be pointed out that the silicon substrate is a relatively mature existing technology, but it is not the only one, and other substrates such as gallium nitride can also be used instead.

As shown in FIG. 3 , it is a kind of optical fiber code demodulation system according to the embodiment of the second aspect of the present invention, including a multi-wavelength spaced DFB array light source 100, which is used to output light waves of different wavelengths;

A circulator 200, the first end of the circulator 200 is connected to the output end of the multi-wavelength interval DFB array light source through an optical fiber, and the second end of the circulator 200 is used to connect the optical fiber code 600 to be demodulated through an optical fiber;

The APD photoelectric conversion unit 300 is connected to the third end of the circulator 200 to receive and convert the light wave reflected by the optical fiber code;

The AD high-speed acquisition unit 400 is connected with the APD photoelectric conversion unit 300 for collecting the light wave signal converted by the APD photoelectric conversion unit 300;

The high-speed control module 500 is electrically connected with the multi-wavelength interval DFB array light source 100 and the AD high-speed acquisition unit 400 respectively, and is used to control the light wave output of the multi-wavelength interval DFB array light source 100, receive the light wave signal transmitted by the AD high-speed acquisition unit 400, and According to the light wave signal transmitted by the AD high-speed acquisition unit 400, the central wavelength combination, reflected energy, and distance of the optical fiber code 600 are analyzed.

This embodiment takes advantage of the modulation change between the temperature change of the light source and the wavelength, directly uses the temperature modulation to change the output wavelength of the light source, so that one light source can cover a wider wave band, so that on the one hand, the quantity cost of the light source can be reduced, and on the other hand, the output wavelength of the light source can be changed. When using multiple light sources, only a temperature sensor and a low-cost light intensity detection device are required. The temperature signal of the temperature sensor can match the wavelength of the light source according to the temperature-wavelength relationship, and the light intensity detection device measures the light wave energy alone. In addition, two or more light source groups with 120-point interleaving wavelength coupling can make up the gap between adjacent wavelength bands of traditional dense wavelength division multiplexers, and realize an adjustable light source with full coverage of the wavelength range, which is more conducive to realizing low-cost Fiber code demodulation.

The optical fiber code 600 in this technical solution is composed of a single or multiple marking points that reflect or transmit light waves, which can be uniquely identified by combining different wavelengths; it can also be realized by using the distance difference between adjacent groups to form different combinations. Unique identification; it is also possible to use the difference between reflected or transmitted energy to form a combination to achieve unique identification; the characteristics of optical fiber coding are mainly to realize the unique identification characteristics of light waves, which requires the marking points to have reflection or transmission energy for light waves. Differentiation is formed in the spectrum; from the perspective of reflection, it can form reflection or transmission for fiber gratings, filter devices, fusion points, and physical connection points. However, the fusion points and physical connection points will have overall attenuation, that is, for Light waves form a large amount of energy attenuation; filter devices include chip filters and membrane filters in addition to fiber grating filters. The wavelength width of existing processes is too large, which is not conducive to large-scale applications from an engineering point of view; , small attenuation, etc., are preferred in this embodiment; fiber gratings can be engraved with fiber gratings of different wavelengths on optical fiber media and silicon-based circuits, and it has processing on optical fibers and processing on silicon-based circuit boards, as well as direct coupling with optical fibers and The excellent characteristics of transmitting light waves are preferred in this embodiment;

Among fiber gratings, fiber Bragg gratings have the advantages of narrow wavelength, controllable single wavelength, and possible reflection energy, which are preferred in this embodiment; however, there are also chirped fiber gratings, phase fiber gratings, and sampling fiber gratings in fiber gratings. It has a very special advantage, that is, it can produce multiple fiber gratings with different wavelengths at the same time. However, due to the poor control of the wavelength stability of the existing processing functions, it cannot be effectively realized on a large scale;

In the optical fiber code 600, the combination of each identification point can be in the form of wavelength combination, spacing combination, reflection energy combination and mixed combination, as shown in Figure 4a, Figure 4b, and Figure 4c, which are schematic diagrams of optical fiber encoding for different wavelength combinations, Schematic diagram of light encoding with the same wavelength and different spacing, and optical fiber encoding with different combinations of reflected energy.

Among them, the combination of reflected energy is a combination of different reflected energies that is processed according to different reflectivities when the marking points are processed; this method is suitable for use under the conditions of short distances and a small number of optical fiber codes. The main reasons are as follows: First, it is difficult to accurately control and process the reflected energy; second, the energy shielding between multiple optical fiber coding combinations affects the final reflected energy recognition; third, the optical fiber will produce corresponding attenuation, and after a long distance , its reflected energy will be reduced, which is not conducive to the identification of reflected energy differences.

The combination of the same wavelength and different spacing distances can be processed into marking points according to a certain distance difference, which can be used on a large scale. However, it still has certain limitations. First, the distance difference is too large to be convenient for application; second, the distance difference If the pulse is too small, the light pulse of the light source is required to be smaller. The smaller the pulse, the smaller the light intensity, and the shorter the recognition distance. Only meters can form different reflection points, unless the light source intensity is controlled in real time to reduce the light intensity, but it also affects the recognition distance; third, the frequency collected by the APD photoelectric conversion unit 300 and the AD high-speed acquisition unit 400, and the sampling space accuracy, which adopts the spatial accuracy The smaller the distance difference is, the smaller the identified distance difference will be, but the cost will be higher. However, in the way of pitch combination, a single-wavelength light source or a relatively narrow light source can be used, so that the cost will also be reduced.

The optical fiber code 600 of different wavelength combinations is processed by marking points with different central wavelengths, which reflect different central wavelengths in the same timetable, so as to realize unique combination. Its disadvantage is that it needs to demodulate the wavelength, and the cost is high, but it is not limited by distance.

As shown in FIG. 5, it is an optical fiber coding and demodulation method according to the embodiment of the third aspect of the present invention, which is applied to the above-mentioned optical fiber coding and demodulation system. The optical fiber coding and demodulation method includes:

S100. The high-speed control module 500 controls the multi-wavelength interval DFB array light source 100, so that a single light source 121 emits a stable central wavelength light wave;

S200, the light wave enters the optical fiber code 600 through the circulator 200, the optical fiber code 600 reflects the corresponding wavelength, and is collected by the APD photoelectric conversion unit 300 through the circulator 200 and converted into an electrical signal;

S300. When the high-speed control module 500 controls the light source to send pulsed light waves, it synchronously performs high-speed acquisition on the AD high-speed acquisition unit 400;

S400. Control the light source 121 to send light waves with different central wavelengths, and finally form a data group with the wavelength as the coordinate;

S500, the high-speed control module 500 forms a three-dimensional data group according to the collected time point as X coordinate, wavelength as Y coordinate, and energy as ordinate, and the data at the same time point is the reflection of the same optical fiber code, and finally calculates the central wavelength and Reflect energy, calculate the distance at the time point, and finally form the central wavelength combination, reflected energy, and distance of the optical fiber code 600.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A multi-wavelength spaced DFB array light source, comprising:

a substrate; and formed on the substrate

At least two light source groups, each of which has a plurality of light sources with different wavelengths and a temperature modulation unit to realize non-overlapping wavelength bands; a plurality of wavelength bands of the light source group form a continuous wavelength interval;

at least two wavelength coupling modules, the number of which is consistent with that of the light source groups, and the wavelength coupling modules are used for coupling a plurality of light source outputs of the corresponding light source groups;

and the waveguide couplers are respectively connected with the output ends of the different wavelength coupling modules.

2. The multiple wavelength spaced DFB array light source of claim 1, wherein: the light source is a narrow-wave light source, and the length of the wavelength band is 4 nanometers.

3. The multiple wavelength spaced DFB array light source of claim 1, wherein: the wavelength coupling module is a dense wavelength division multiplexer.

4. The multiple wavelength spaced DFB array light source of claim 1, wherein: the wavelength coupling module is an array waveguide grating.

5. The multiple wavelength spaced DFB array light source of claim 1, wherein: SOA optical switches are arranged between the output ends of the different wavelength coupling modules and the waveguide couplers.

6. The multiple wavelength spaced DFB array light source of claim 1, wherein: the waveguide coupler is a Y-structure coupler.

7. The multiple wavelength spaced DFB array light source of claim 1 or 6, wherein: the output end of the waveguide coupler is connected with an optical fiber leading-out groove formed on the edge of the substrate.

8. The multiple wavelength spaced DFB array light source of claim 1, wherein: the substrate is a silicon substrate.

9. An optical fiber encoding and demodulating system, characterized in that: comprises that

A multiple wavelength spaced DFB array light source as claimed in any one of claims 1 to 8 for outputting light waves of different wavelengths;

a first end of the circulator is connected with the output end of the multi-wavelength interval DFB array light source through an optical fiber, and a second end of the circulator is used for connecting an optical fiber code to be demodulated through an optical fiber;

the APD photoelectric conversion unit is connected with the third end of the circulator to receive and convert the light waves reflected by the optical fiber codes;

the AD high-speed acquisition unit is connected with the APD photoelectric conversion unit and is used for acquiring the light wave signals converted by the APD photoelectric conversion unit;

and the high-speed control module is respectively electrically connected with the multi-wavelength interval DFB array light source and the AD high-speed acquisition unit, and is used for controlling the light wave output of the multi-wavelength interval DFB array light source, receiving the light wave signals transmitted by the AD high-speed acquisition unit and analyzing the central wavelength combination, the reflection energy and the distance of the optical fiber code according to the light wave signals transmitted by the AD high-speed acquisition unit.

10. An optical fiber encoding and demodulating method, characterized by: an optical fiber coding and demodulating system applied to the optical fiber coding and demodulating system of claim 9, wherein the optical fiber coding and demodulating method comprises the following steps:

the high-speed control module controls the multi-wavelength interval DFB array light source to realize that a single light source emits stable central wavelength light waves;

the light wave is input into the optical fiber code through the circulator, the optical fiber code reflects the corresponding wavelength, and is collected and converted into an electric signal by the APD photoelectric conversion unit through the circulator;

the high-speed control module synchronously carries out high-speed acquisition on the AD high-speed acquisition unit when the light source is controlled to send pulse light waves;

controlling a light source to send light waves with different central wavelengths to finally form a data set with the wavelengths as coordinates;

the high-speed control module forms a three-dimensional data set with an X coordinate, a Y coordinate and a vertical coordinate according to the collected time points, the data at the same time point are reflected by the same optical fiber code, the central wavelength, the reflected energy and the time point are finally calculated according to the energy difference, and the central wavelength combination, the reflected energy and the distance of the optical fiber code are finally formed.

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