A multi-wavelength interval DFB array light source, a fiber optic coding and demodulation system and method

Abstract

The present invention discloses a multi-wavelength interval DFB array light source, an optical fiber coding and demodulation system and method. The DFB light source includes: a substrate; and formed on the substrate are: at least two light source groups, each light source group having a plurality of light sources with different wavelengths, and each light source having a temperature modulation unit to achieve non-overlapping wavelength bands; the plurality of wavelength bands of the light source groups form a continuous wavelength interval; at least two wavelength coupling modules for coupling the outputs of the plurality of light sources of the corresponding light source groups; and a waveguide coupler respectively connected to the output ends of different wavelength coupling modules. This solution utilizes the modulation change between the light source temperature change and the wavelength, directly uses temperature modulation to change the output wavelength of the light source, enables one light source to cover a wider wavelength band, and the two or more light source groups are wavelength-coupled in an interleaved manner, which can make up for the gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer, and realizes a tunable light source with a full-coverage wavelength interval.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication, and particularly to a multi-wavelength interval DFB array light source, an optical fiber coding and demodulation system and method. Background Art

[0002] Conventionally, multiple light sources are combined to form a tunable light source to achieve optical fiber coding and demodulation. Mainly, optical switch switching, pairwise Y-couplers, AWG (arrayed waveguide grating) or dense wavelength division multiplexers are used for coupling. However, the optical switch switching is slow and it is difficult to reach the required millisecond level. The pairwise Y-couplers have excessive loss after coupling with multiple light sources. There is a problem that the wavelength interval cannot be fully covered in the coupling of AWG or dense wavelength division multiplexers. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a multi-wavelength interval DFB array light source, which can reduce loss and fully cover the program wavelength interval. The present invention also provides an optical fiber coding and demodulation system and method to realize the demodulation of optical fiber coding.

[0004] A multi-wavelength interval DFB array light source according to an embodiment of the first aspect of the present invention includes: a substrate; and formed on the substrate: at least two light source groups, each light source group having multiple light sources with different wavelengths, and each light source having a temperature modulation unit to achieve non-overlapping wavelength bands; the multiple wavelength bands of the light source groups form a continuous wavelength interval; at least two wavelength coupling modules, having the same number as the light source groups, for coupling the outputs of the multiple light sources of the corresponding light source groups; and a waveguide coupler, respectively connected to the output ends of different wavelength coupling modules.

[0005] A multi-wavelength interval DFB array light source according to the first embodiment of the present invention has at least the following beneficial effects: This solution utilizes the modulation change between the light source temperature change and the wavelength, and directly uses temperature modulation to change the output wavelength of the light source, so that one light source can cover a wider wavelength band. On the one hand, this can reduce the cost of the number of light sources. On the other hand, when using multiple light sources, only a temperature sensor and a low-cost light intensity detection device are needed. The temperature signal of the temperature sensor can match the light source wavelength according to the temperature-wavelength relationship, and the light intensity detection device measures the optical wave energy separately. And the multiple wavelength bands of two or more light source groups are coupled in an interleaved manner, which can make up for the gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer and realize a tunable light source with a fully covered wavelength interval.

[0006] 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 band is 4 nanometers.

[0007] According to some embodiments of the first aspect of the present invention, the wavelength coupling module is a dense wavelength division multiplexer.

[0008] According to some embodiments of the first aspect of the present invention, the wavelength coupling module is an arrayed waveguide grating.

[0009] According to some embodiments of the first aspect of the present invention, an SOA optical switch is provided between the output ends of different wavelength coupling modules and the waveguide coupler.

[0010] According to some embodiments of the first aspect of the present invention, the waveguide coupler is a Y-structure coupler.

[0011] According to some embodiments of the first aspect of the present invention, the output end of the waveguide coupler is connected to an optical fiber lead-out groove formed at the edge of the substrate.

[0012] According to some embodiments of the first aspect of the present invention, the substrate is a silicon substrate.

[0013] An optical fiber coding and demodulation system according to an embodiment of the second aspect of the present invention includes

[0014] The multi-wavelength interval DFB array light source as described above, which is used to output light waves of different wavelengths;

[0015] 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 be connected to the optical fiber coding to be demodulated through an optical fiber;

[0016] An APD photoelectric conversion unit, which is connected to the third end of the circulator to receive and convert the light waves reflected by the optical fiber coding;

[0017] An AD high-speed acquisition unit, which is connected to the APD photoelectric conversion unit and is used to acquire the light wave signal converted by the APD photoelectric conversion unit;

[0018] A high-speed control module, which 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, receive the light wave signal transmitted by the AD high-speed acquisition unit, and analyze the center wavelength combination, reflection energy, and distance of the optical fiber coding according to the light wave signal transmitted by the AD high-speed acquisition unit.

[0019] An optical fiber coding and demodulation system according to an embodiment of the second aspect of the present invention has at least the following beneficial effects: This solution utilizes the modulation change between the light source temperature change and the wavelength, directly uses temperature modulation to change the output wavelength of the light source, enabling a single light source to cover a wider wavelength band. In this way, on the one hand, the cost of the number of light sources can be reduced, and 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 match the light source wavelength according to the temperature-wavelength relationship, and the light intensity detection device measures the optical wave energy independently. Moreover, two or more light source components are coupled with staggered wavelengths, which can make up for the gap between adjacent wavelength bands of traditional dense wavelength division multiplexers, realizing an adjustable light source with a full coverage wavelength range, which is more conducive to realizing low-cost optical fiber coding and demodulation.

[0020] An optical fiber coding and demodulation method according to an embodiment of the third aspect of the present invention is applied to the above-mentioned optical fiber coding and demodulation system. The optical fiber coding and demodulation method includes:

[0021] The high-speed control module controls the multi-wavelength interval DFB array light source to enable a single light source to emit a stable central wavelength optical wave;

[0022] The optical wave is input into the optical fiber coding through the circulator. The optical fiber coding reflects the corresponding wavelength and is collected by the APD photoelectric conversion unit through the circulator and converted into an electrical signal;

[0023] When the high-speed control module controls the light source to send pulsed optical waves, it synchronously performs high-speed acquisition on the AD high-speed acquisition unit;

[0024] Control the light source to send optical waves with different central wavelengths, and finally form a data group with wavelength as the coordinate;

[0025] The high-speed control module forms a three-dimensional data group with the acquisition time point as the X coordinate, the wavelength as the Y coordinate, and the energy as the vertical coordinate. The data at the same time point is the reflection of the same optical fiber coding. According to the energy difference, the central wavelength and the reflection energy are finally calculated, and the distance is calculated from the time point. Finally, the central wavelength combination, reflection energy, and distance of the optical fiber coding are formed.

[0026] A fiber optic coding demodulation method according to an embodiment of the third aspect of the present invention has at least the following beneficial effects: This solution utilizes the modulation change between the light source temperature and wavelength, directly uses temperature modulation to change the output wavelength of the light source, enabling one light source to cover a wider wavelength band. On the one hand, this can reduce the cost of the number of light sources. 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 match the light source wavelength through the temperature-wavelength relationship, and the light intensity detection device measures the optical wave energy independently. Moreover, two or more light source components are wavelength-coupled in an interleaved manner, which can make up for the gap between adjacent wavelength bands of traditional dense wavelength division multiplexers, realizing a tunable light source with a full coverage wavelength range, and is more conducive to realizing low-cost fiber optic coding demodulation.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0029] Figure 1 is a schematic diagram of a multi-wavelength interval DFB array light source according to an embodiment of the first aspect of the present invention;

[0030] Figure 2 is a cross-sectional structure diagram of a multi-wavelength interval DFB array light source according to an embodiment of the first aspect of the present invention;

[0031] Figure 3 is a schematic diagram of a fiber optic coding demodulation system according to an embodiment of the second aspect of the present invention;

[0032] Figure 4a 、 Figure 4b 、 Figure 4c are respectively fiber optic coding schematic diagrams of different types;

[0033] Figure 5 is a flowchart of a fiber optic coding demodulation method according to an embodiment of the third aspect of the present invention.

[0034] REFERENCE SIGNS:

[0035] 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, fiber optic lead-out groove 160,

[0036] Circulator 200,

[0037] APD photoelectric conversion unit 300,

[0038] AD high-speed acquisition unit 400,

[0039] high-speed control module 500,

[0040] optical fiber encoder 600. Specific embodiments

[0041] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0042] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present invention.

[0043] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. 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.

[0044] Referring to Figure 1 、 Figure 2 As shown, a multi-wavelength interval DFB array light source 100 according to an embodiment of the first aspect of the present technical solution includes: a substrate 110; and formed on the substrate 110 are: two light source groups 120 or multiple light source groups 120, each light source group 120 having multiple light sources 121 with different wavelengths, and each light source 121 having a temperature modulation unit 122 to achieve non-overlapping wavelength bands; the multiple wavelength bands of the light source group 120 form a continuous wavelength interval; two wavelength coupling modules 130 or multiple wavelength coupling modules 130, the number of which is the same as that of the light source groups 120, for coupling the outputs of the multiple light sources 121 of the corresponding light source groups 120; and a waveguide coupler 140, which is respectively connected to the output ends of different wavelength coupling modules 130.

[0045] Among them, each light source utilizes the temperature modulation unit 122, and can increase the wavelength by up to 4.2 nm, that is, it meets 0.1 nm / degree. From 20 to 62 degrees, it fully meets the working requirements of the light source chip. Multiple light sources overall cover 1510 - 1590 nm, achieving gapless coverage. For example, in the first group of light source groups 120, there are 1510, 1518, 1526, 1534. By using temperature modulation of 4 nm, it can cover different wavelength bands such as 1510 - 1514, 1518 - 1522, 1526 - 1530, 1534 - 1538 nm, etc. Its dense wavelength division can select 1512 ± 2, 1520 ± 2, 1528 ± 2, 1536 ± 2; in the second group of light source groups 120, there are 1514, 1522, 1530. By using temperature modulation of 4 nm, it can cover different wavelength bands such as 1514 - 1518, 1522 - 1526, 1530 - 1534, etc. Its dense wavelength division can select 1516 ± 2, 1524 ± 2, 1532 ± 2; these two groups of light sources can be combined to cover 1510 - 1538 nm, and at the same time can meet the gap wavelength filling brought by dense wavelength division. Finally, the outputs of the two wavelength coupling modules 130 are coupled using a Y structure, and the fiber attenuation is reduced. If the wavelength gap of the dense wavelength division is wider, the number of light source groups 120 needs to be increased.

[0046] As Figure 2 shown, the light source 121 is provided with a grating 123 on the light-emitting body. Each light source has a grating 123 with a different wavelength to select the wavelength. The grating 123 is affected by temperature changes, and its wavelength also changes. By using the temperature modulation unit 122 TEC, the temperature of the grating 123 can be changed, and thus the output light wave wavelength can be changed, realizing the temperature modulation of the output wavelength of the light source. Specifically, the temperature is controlled at the required temperature to modulate the increased value of the light source wavelength, basically according to 0.1 nm / degree. For example, the wavelength of the light source 121 at 20 degrees is 1520.00 nm. If we need 1521. nm, we only need to adjust the temperature to 30 degrees to emit a wavelength of 1521.00 nm.

[0047] This solution utilizes the modulation change between the light source temperature change and the wavelength, and directly uses temperature modulation to change the output wavelength of the light source, enabling a single light source to cover a wider wavelength band. On the one hand, this can reduce the cost of the number of light sources. On the other hand, 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 light source wavelength according to the temperature - wavelength relationship, and the light intensity detection device measures the light wave energy alone. And two or more light source groups 120 are wavelength-coupled in an interleaved manner, which can make up for the gap between adjacent wavelength bands of the traditional dense wavelength division multiplexer, realizing an adjustable light source with a full coverage wavelength range.

[0048] It can be seen that the present solution is directed to the main inventive concept of the present solution that 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 divisions to stagger the wavelength bands and superimpose each other to complete the coverage of the complete wavelength.

[0049] In some embodiments of the first aspect of the present invention, the wavelength coupling module 130 is a dense wavelength division multiplexer.

[0050] In some embodiments of the first aspect of the present invention, the wavelength coupling module 130 is an arrayed waveguide grating, which is used to replace the dense wavelength division multiplexer. Both are applicable to the present solution. Among them, the arrayed waveguide grating can be directly processed on a silicon-based chip, so it is more preferred.

[0051] Considering the problem of light intensity attenuation after optical wave coupling, as Figure 1 described, in some embodiments of the first aspect of the present invention, an SOA optical switch 150 is provided between the output ends of different wavelength coupling modules 130 and the waveguide coupler 140, which has a certain amplification effect. In view of the limitation of the wavelength coverage width of the SOA optical switch 150, the SOA optical switch 150 is placed behind the wavelength coupling module 130 to increase the light intensity.

[0052] In some embodiments of the first aspect of the present invention, the waveguide coupler 140 is a Y-shaped coupler. Although there is also a certain attenuation, compared with all light sources using Y-shaped couplers for pairwise coupling, the proportion of Y-shaped couplers used in the present technical solution is extremely small, which can greatly reduce the attenuation.

[0053] 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 to an optical fiber lead-out groove 160 formed on the edge of the substrate 110, which is convenient for the output of optical waves.

[0054] In some embodiments of the first aspect of the present invention, the substrate 110 is a silicon substrate. By directly processing a light source, a temperature modulation unit 122, a wavelength coupling module 130, an SOA optical switch 150, and a waveguide coupler 140 on the silicon substrate using holographic exposure and other technologies, chipization of the DFB light source can be achieved, and the structure is more compact and the cost is greatly reduced. It should be noted 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 to replace it.

[0055] As Figure 3 shown, a fiber optic coding and demodulation system according to an embodiment of the second aspect of the present invention includes a multi-wavelength interval DFB array light source 100 for outputting optical waves of different wavelengths;

[0056] Circulator 200, the first end of the circulator 200 is connected to the output end of the multi-wavelength spaced DFB array light source through an optical fiber, and the second end of the circulator 200 is used to be connected to the fiber optic code 600 to be demodulated through an optical fiber;

[0057] APD photoelectric conversion unit 300, connected to the third end of the circulator 200 to receive and convert the light wave reflected by the fiber optic code;

[0058] AD high-speed acquisition unit 400, connected to the APD photoelectric conversion unit 300, for acquiring the light wave signal converted by the APD photoelectric conversion unit 300;

[0059] High-speed control module 500, electrically connected to the multi-wavelength spaced DFB array light source 100 and the AD high-speed acquisition unit 400 respectively, for controlling the light wave output of the multi-wavelength spaced DFB array light source 100, receiving the light wave signal transmitted by the AD high-speed acquisition unit 400, and parsing out the center wavelength combination, reflection energy, and distance of the fiber optic code 600 according to the light wave signal transmitted by the AD high-speed acquisition unit 400.

[0060] In this embodiment, there is a modulation change between the light source temperature change and the wavelength. The temperature modulation is directly used to change the output wavelength of the light source, so that one light source can cover a wider wavelength band. On the one hand, this can reduce the cost of the number of light sources. On the other hand, when multiple light sources are used, only a temperature sensor and a low-cost light intensity detection device are needed. The temperature signal of the temperature sensor can match the light source wavelength according to the temperature-wavelength relationship, and the light intensity detection device measures the light wave energy alone. And two or more light source groups 120 are coupled with staggered wavelengths, which can make up for the gap between adjacent wavelength segments of the traditional dense wavelength division multiplexer, realizing an adjustable light source with a full coverage wavelength range, which is more conducive to realizing low-cost fiber optic code demodulation.

[0061] The optical fiber code 600 in this technical solution is composed of single or multiple identification points that reflect or transmit light waves. It can achieve unique identification through wavelength combination; it can also use the distance difference between adjacent ones to form different combinations for unique identification; it can also use the difference between reflection or transmission energies to form combinations for unique identification. The main feature of the optical fiber code lies in the unique identification feature of light waves, which requires the identification points to have the reflection or transmission energy of light waves, forming a differentiation on the light wave spectrum. From the reflection perspective, fiber Bragg gratings, filtering devices, fusion joints, and physical connection points can all form reflection or transmission. However, both fusion joints and physical connection points have overall attenuation, that is, a large amount of energy attenuation to light waves. For filtering devices, in addition to fiber Bragg grating filtering, there are also chip filtering and film filtering. In the existing process, their wavelength widths are too large, which is not conducive to large-scale application from an engineering perspective. Fiber Bragg gratings have characteristics such as fiber material and low attenuation, and are preferred for this embodiment. Fiber Bragg gratings can engrave fiber Bragg gratings with different wavelengths on fiber media and silicon-based circuits. They have excellent characteristics of processing on fibers, processing on silicon-based circuit boards, directly coupling with fibers, and transmitting light waves, and are preferred for this embodiment.

[0062] Among fiber Bragg gratings, the Bragg fiber grating has advantages such as narrow wavelength, controllable single wavelength, and possible reflection energy, and is preferred in this embodiment. However, there are also chirped fiber gratings, phase fiber gratings, and sampled fiber gratings in fiber Bragg gratings. They have a very special advantage, that is, they can generate multiple fiber Bragg gratings with different wavelengths at the same time. However, due to the poor control of wavelength stability in the existing processing functions, it cannot be effectively realized on a large scale.

[0063] In the optical fiber code 600, the combination methods of each identification point can be wavelength combination, spacing combination, reflection energy combination, and mixed combination. For example Figure 4a , Figure 4b , Figure 4c shown, they are respectively the schematic diagram of the optical fiber code with different wavelength combinations, the optical fiber code with the same wavelength and different spacings, and the optical fiber code with different reflection energy combinations.

[0064] Among them, the reflection energy combination is processed according to different reflectivities during the processing of the identification points, and then a combination method of different reflection energies is formed. This method is suitable for use under the conditions of short distance and few optical fiber codes. The main reasons are as follows: First, it is difficult to accurately control the processing of reflection energy; second, there is energy shielding between multiple optical fiber codes when used in combination, affecting the final reflection energy recognition; third, the optical fiber will generate corresponding attenuation, and after a long distance, its reflection energy will decrease, which is not conducive to the recognition of reflection energy differences.

[0065] Identical wavelengths with different spacing combinations are used to process identification points at a certain distance difference, which can be used on a large scale. However, there are still certain limitations. First, a too large distance difference is not convenient for application. Second, a too small distance difference places a smaller requirement on the light emission pulse of the light source. The smaller the pulse, the smaller the light intensity, and the shorter the recognition distance. For example, for a light source pulse of 5 ns, its coverage distance is approximately 0.5 meters. That is to say, the distance difference must be greater than 0.5 meters to form different reflection points, unless the light source intensity is controlled in real time to reduce the light intensity, but this will also affect the recognition distance. Third, the frequencies collected by the APD photoelectric conversion unit 300 and the AD high-speed acquisition unit 400, and the sampling spatial accuracy. The smaller the spatial accuracy used, the smaller the recognized distance difference, but the cost will also be higher. However, for the spacing combination method, a single-wavelength light source or a relatively narrow light source can be used, which will also reduce the cost.

[0066] The optical fiber coding 600 with different wavelength combinations, that is, identification points with different central wavelengths are processed. It reflects different central wavelengths at the same time schedule to achieve a unique combination. Its disadvantage is that wavelength demodulation is required, and the cost is relatively high, but it is not restricted by distance, etc.

[0067] As Figure 5 shown, it is a method for demodulating optical fiber coding according to an embodiment of the third aspect of the present invention, which is applied to the above-mentioned optical fiber coding demodulation system. The optical fiber coding demodulation method includes:

[0068] S100. The high-speed control module 500 controls the multi-wavelength spaced DFB array light source 100 to enable a single light source 121 to emit a stable central wavelength light wave;

[0069] S200. The light wave is input into the optical fiber coding 600 through the circulator 200. The optical fiber coding 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;

[0070] S300. When the high-speed control module 500 controls the light source to send a pulsed light wave, it synchronously performs high-speed acquisition on the AD high-speed acquisition unit 400;

[0071] S400. Control the light source 121 to send light waves with different central wavelengths, and finally form a data group with wavelength as the coordinate;

[0072] S500. The high-speed control module 500 forms a three-dimensional data group with the collected time points as the X coordinate, the wavelength as the Y coordinate, and the energy as the vertical coordinate. The data at the same time point is reflected by the same optical fiber coding. According to the energy difference, the central wavelength and the reflected energy are finally calculated, and the distance is calculated from the time point. Finally, the central wavelength combination, the reflected energy, and the distance of the optical fiber coding 600 are formed.

[0073] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do 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.

[0074] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-wavelength interval DFB array light source, characterized in that, Comprising: A substrate; And at least two light source groups formed on the substrate, each light source group having a plurality of light sources with different wavelengths, and each light source having a temperature modulation unit to achieve non-overlapping wavelength bands; the plurality of wavelength bands of the light source groups form a continuous wavelength range, and two or more light source groups are wavelength-coupled in an interleaved manner; the light source is provided with a grating on the light-emitting body, and each light source has a grating with a different wavelength to select the wavelength. The grating is affected by temperature changes and its wavelength also changes. By using the temperature modulation unit, the temperature of the grating can be changed, thereby changing the output light wave wavelength and realizing the temperature modulation of the output wavelength of the light source; At least two wavelength coupling modules, the number of which is the same as that of the light source groups, for coupling the outputs of the plurality of light sources of the corresponding light source groups; A waveguide coupler, respectively connected to the output ends of different wavelength coupling modules. The light source is a narrow-wave light source, and the length of the wavelength band is 4 nanometers.

2. The multi-wavelength interval DFB array light source according to claim 1, wherein: The wavelength coupling module is a dense wavelength division multiplexer.

3. A multi-wavelength interval DFB array light source according to claim 1, characterized in that: The wavelength coupling module is an arrayed waveguide grating.

4. A multi-wavelength interval DFB array light source according to claim 1, characterized in that: SOA optical switches are provided between the output ends of different wavelength coupling modules and the waveguide coupler.

5. A multi-wavelength interval DFB array light source according to claim 1, characterized in that: The waveguide coupler is a Y-structure coupler.

6. A multi-wavelength interval DFB array light source according to claim 1, characterized in that: The output end of the waveguide coupler is connected to an optical fiber lead-out groove formed at the edge of the substrate.

7. A multi-wavelength interval DFB array light source according to claim 1 or 6, characterized in that: The substrate is a silicon substrate.

8. A multi-wavelength interval DFB array light source according to claim 1, characterized in that: Including 9. An optical fiber coding and demodulation system, characterized in that: A multi-wavelength interval DFB array light source according to any one of claims 1 to 8, for outputting light waves with 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 to a fiber optic code to be demodulated through an optical fiber; An APD photoelectric conversion unit, connected to the third end of the circulator to receive and convert the light wave reflected by the fiber optic code; An AD high-speed acquisition unit, connected to the APD photoelectric conversion unit, for acquiring the light wave signal converted by the APD photoelectric conversion unit; A high-speed control module, electrically connected to the multi-wavelength interval DFB array light source and the AD high-speed acquisition unit respectively, for controlling the light wave output of the multi-wavelength interval DFB array light source, receiving the light wave signal transmitted by the AD high-speed acquisition unit, and analyzing the central wavelength combination, reflection energy, and distance of the fiber optic code according to the light wave signal transmitted by the AD high-speed acquisition unit. Applied to an optical fiber code demodulation system according to claim 9, the optical fiber code demodulation method includes:

10. An optical fiber coding and demodulation method, characterized in that: The high-speed control module controls the multi-wavelength interval DFB array light source to achieve a stable central wavelength light wave emitted by a single light source; The light wave is input into the fiber optic code through the circulator, the fiber optic 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 synchronously performs high-speed acquisition on the AD high-speed acquisition unit; Controlling the light source to send light waves with different central wavelengths, and finally forming a data group with wavelength as the coordinate; ​ The high-speed control module forms a three-dimensional data set with the time points collected as the X coordinate, the wavelength as the Y coordinate, and the energy as the vertical coordinate. The data at the same time point is the reflection of the same fiber optic code. Based on the energy difference, the central wavelength, the reflected energy, and the distance are finally calculated from the time point. Ultimately, the central wavelength combination, the reflected energy, and the distance of the fiber optic code are formed.

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