DFB array coupled adjustable light source, optical fiber coding demodulation system and method

Abstract

The invention discloses a DFB array coupled adjustable light source, an optical fiber coding demodulation system and a method. The DFB array coupled adjustable light source comprises: a plurality of light source units, a wave combining module and a light wave amplification module. The light source unit comprises a first waveguide connecting part and a plurality of DFB light source modules connected in series through the first waveguide connecting part, and is used to generate light waves with different central wavelengths. The output ends of the plurality of light source units are connected to the input end of the wave combining module for combining the light waves. The light wave amplification module comprises a plurality of SOAs connected in series, each SOA having a different central wavelength. The output end of the wave combining module is connected to the input end of a first-stage SOA, and the output end of a last-stage SOA is used to output the light wave. The light wave amplification module amplifies the light wave and then outputs it, thereby reducing the attenuation caused by light wave transmission. SOAs with different central wavelengths can amplify light waves of different wavelength bands, and the output light wave energy is stable, thereby reducing the difficulty of optical fiber coding recognition.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication technology, and in particular to a DFB array coupled adjustable light source, an optical fiber coding demodulation system and a method. Background Art

[0002] When using DFB light source tuning for fiber code identification, due to the large number of DFB light sources, the multiple light waves generated have large attenuation when they converge in the chip, making fiber code identification difficult. One existing technology uses a semiconductor optical amplifier (SOA) to amplify the light wave to reduce the attenuation of the light wave, such as Figure 1 to Figure 2 As shown, SOAs with different central wavelengths have different gain levels for light waves in different bands, and the gain level for light waves close to the central wavelength of the SOA is greater. This results in large differences in the output light intensities of light waves with different central wavelengths after being amplified by the SOA, and the output cannot be smooth, making it difficult to identify optical fiber codes. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a DFB array coupled adjustable light source, a fiber coding demodulation system and method, which can solve the problem of high difficulty in fiber coding recognition due to large light wave attenuation and unstable light wave output energy in the existing DFB light source tuning technology.

[0004] According to the first aspect of the present invention, the DFB array-coupled tunable light source comprises: a plurality of light source units, wherein the light source units comprise a first waveguide connection portion and a plurality of DFB light source modules connected in series through the first waveguide connection portion, and are used to generate light waves with different central wavelengths; a wave combining module, wherein the output ends of the plurality of light source units are connected to the input end of the wave combining module for combining light waves; and a light wave amplification module, wherein the light wave amplification module comprises a plurality of SOAs connected in series, wherein the central wavelengths of the respective SOAs are different, the output end of the wave combining module is connected to the input end of the first-stage SOA, and the output end of the last-stage SOA is used to output light waves.

[0005] The DFB array coupled tunable light source according to the first aspect of the present invention has at least the following beneficial effects:

[0006] A plurality of DFB light source modules are connected in series through a first waveguide connection portion, and a plurality of light source units are connected in parallel to a wave combining module to form a DFB light source array. Light waves with different central wavelengths are generated by controlling different DFB light source modules to work. Light waves with different central wavelengths output by a plurality of light source modules are combined by the wave combining module and then pass through a light wave amplification module. The light wave amplification module amplifies the light waves and then outputs them, thereby reducing attenuation generated by transmission of the light waves in the first waveguide connection portion and the wave combining module. A plurality of SOAs with different central wavelengths in the light wave amplification module can amplify light waves of different wavelength bands, so that light waves of different wavelength bands are amplified to a similar degree, thereby reducing energy differences between light waves of different wavelength bands, outputting light wave energy stably, and reducing the difficulty of optical fiber coding recognition.

[0007] According to some embodiments of the present invention, the DFB light source module includes a first DFB light source and several second DFB light sources, the first DFB light source includes a first luminous body layer, a grating layer and a second luminous body layer stacked in sequence, the second DFB light source includes a first luminous body layer, a waveguide layer, a grating layer and a second luminous body layer stacked in sequence, the waveguide layer and the grating layer of the second DFB light source are connected to the waveguide layer of the second DFB light source of the next level through the first waveguide connecting portion, and the grating layer of the first DFB light source is connected to the waveguide layer of the second DFB light source of the first level through the first waveguide connecting portion.

[0008] According to some embodiments of the present invention, the first DFB light source further comprises a TEC layer disposed on the second luminophore layer of the first DFB light source.

[0009] According to some embodiments of the present invention, the second DFB light source further comprises a TEC layer disposed on the second luminophore layer of the second DFB light source.

[0010] According to some embodiments of the present invention, the optical wave amplification module includes a first SOA and a second SOA, the output end of the wave combining module is connected to the input end of the first SOA, the output end of the first SOA is connected to the input end of the second SOA, and the output end of the second SOA is used to output optical waves.

[0011] According to some embodiments of the present invention, a second waveguide connection portion is further included, and the output end of the first SOA is connected to the input end of the second SOA through the second waveguide connection portion.

[0012] According to some embodiments of the present invention, a substrate is further included, and a plurality of the light source units, the wave combining modules and the light wave amplifying modules are all arranged on the substrate.

[0013] According to the second aspect of the present invention, the DFB array coupled adjustable light source fiber coding and demodulation system comprises: the above-mentioned DFB array coupled adjustable light source; a control module, the output end of the control module is electrically connected to the control end of the DFB array coupled adjustable light source to control the DFB array coupled adjustable light source to emit light waves with different central wavelengths; a circulator, the output end of the DFB array coupled adjustable light source is connected to the first port of the circulator; an optical fiber with optical fiber coding, the second port of the circulator is connected to one end of the optical fiber, and the other end of the optical fiber is used to connect to a terminal communication device; a photoelectric collection module, the third port of the circulator is connected to the input end of the photoelectric collection module, and the output end of the photoelectric collection module is electrically connected to the input end of the control module.

[0014] The DFB array coupled adjustable light source optical fiber coding demodulation system according to the second aspect of the present invention has at least the following beneficial effects:

[0015] A plurality of DFB light source modules are connected in series through a first waveguide connection portion, and a plurality of light source units are connected in parallel to a wave combining module to form a DFB light source array. Light waves with different central wavelengths are generated by controlling different DFB light source modules to work. Light waves with different central wavelengths output by a plurality of light source modules are combined by the wave combining module and then pass through a light wave amplification module. The light wave amplification module amplifies the light waves and then outputs them, thereby reducing attenuation generated by transmission of the light waves in the first waveguide connection portion and the wave combining module. A plurality of SOAs with different central wavelengths in the light wave amplification module can amplify light waves of different wavelength bands, so that light waves of different wavelength bands are amplified to a similar degree, thereby reducing energy differences between light waves of different wavelength bands, outputting light wave energy stably, and reducing the difficulty of optical fiber coding recognition.

[0016] According to some embodiments of the present invention, the photoelectric acquisition module includes a photoelectric conversion module and an AD acquisition module, the third port of the circulator is connected to the input end of the photoelectric conversion module, the output end of the photoelectric conversion module is electrically connected to the input end of the AD acquisition module, and the output end of the AD acquisition module is electrically connected to the input end of the control module.

[0017] According to the DFB array coupled adjustable light source fiber coding demodulation method of the third aspect of the present invention, the fiber coding information table includes the following steps: obtaining a fiber coding information table, the fiber coding information table including a mapping relationship between fiber coding information and the center wavelength, reflection energy and distance of the light wave; emitting a light wave through a light source unit, and collecting the wavelength and energy of the light wave through a photoelectric collection module and recording the collection time; calculating the center wavelength, reflection energy and distance of the light wave according to the collection time, wavelength and energy of the light wave; and determining the fiber coding information according to the fiber coding information table and the center wavelength, reflection energy and distance of the light wave.

[0018] The DFB array coupled adjustable light source optical fiber coding demodulation method according to the third aspect of the present invention has at least the following beneficial effects:

[0019] A plurality of DFB light source modules are connected in series through a first waveguide connection portion, and a plurality of light source units are connected in parallel to a wave combining module to form a DFB light source array. Light waves with different central wavelengths are generated by controlling different DFB light source modules to work. Light waves with different central wavelengths output by a plurality of light source modules are combined by the wave combining module and then pass through a light wave amplification module. The light wave amplification module amplifies the light waves and then outputs them, thereby reducing attenuation generated by transmission of the light waves in the first waveguide connection portion and the wave combining module. A plurality of SOAs with different central wavelengths in the light wave amplification module can amplify light waves of different wavelength bands, so that light waves of different wavelength bands are amplified to a similar degree, thereby reducing energy differences between light waves of different wavelength bands, outputting light wave energy stably, and reducing the difficulty of optical fiber coding recognition.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 Schematic diagram of gain effect of a single SOA a;

[0023] Figure 2 Schematic diagram of gain effect of a single SOA b;

[0024] Figure 3 It is a structural schematic diagram of the DFB array coupled with an adjustable light source of the present invention;

[0025] Figure 4 It is a cross-sectional schematic diagram of a DFB array coupled with an adjustable light source of the present invention;

[0026] Figure 5 A schematic diagram of the gain effect of the lightwave amplification module of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the DFB array coupled adjustable light source optical fiber coding and demodulation system of the present invention;

[0028] Figure 7 The present invention is a flow chart of the fiber optic coding and demodulation method of the DFB array coupled adjustable light source.

[0029] Reference numerals:

[0030] The light source unit 100, the first waveguide connection portion 110, the first DFB light source 120, the second DFB light source 130,

[0031] Combiner module 200,

[0032] first SOA 300, second SOA 310,

[0033] The second waveguide connection portion 400,

[0034] Base 500,

[0035] Control module 600,

[0036] Circulator 700,

[0037] Fiber 800,

[0038] Photoelectric conversion module 900 and AD acquisition module 910 . DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are 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 understood as a limitation on the present invention.

[0041] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0043] Refer to the following Figures 1 to 7 The DFB array coupled adjustable light source, fiber coded demodulation system and method according to the embodiments of the present invention are described.

[0044] like Figure 3As shown, a distributed feedback laser (DFB) array coupled tunable light source according to an embodiment of the first aspect of the present invention includes: a plurality of light source units 100, a wave combining module 200 and a light wave amplification module, wherein the light source unit 100 includes a first waveguide connection portion 110 and a plurality of DFB light source modules connected in series through the first waveguide connection portion 110, and is used to generate light waves with different central wavelengths, the output ends of the plurality of light source units 100 are connected to the input end of the wave combining module 200 for combining light waves, the light wave amplification module includes a plurality of SOAs connected in series, each SOA having a different central wavelength, the output end of the wave combining module 200 is connected to the input end of the first-stage SOA, and the output end of the last-stage SOA is used to output light waves. The first waveguide connection portion 110 and the wave combining module 200 are both made of waveguide materials.

[0045] A plurality of DFB light source modules are connected in series through the first waveguide connection part 110, and a plurality of light source units 100 are connected in parallel to the combiner module 200 to form a DFB light source array. Light waves with different central wavelengths are generated by controlling different DFB light source modules to work. Light waves with different central wavelengths output by the plurality of light source modules are combined by the combiner module 200 and then pass through the light wave amplification module. The light wave amplification module amplifies the light waves and then outputs them, thereby reducing the attenuation generated by the transmission of the light waves in the first waveguide connection part 110 and the combiner module 200. A plurality of SOAs with different central wavelengths in the light wave amplification module can amplify light waves of different wavelength bands, so that light waves of different wavelength bands are amplified to a similar degree, thereby reducing the energy difference between light waves of different wavelength bands, and the output light wave energy is stable, thereby reducing the difficulty of optical fiber coding recognition.

[0046] like Figure 3 As shown, the DFB light source module includes a first DFB light source 120 and a plurality of second DFB light sources 130. Figure 4As shown, the first DFB light source 120 includes a first luminous body layer, a grating layer, and a second luminous body layer stacked in sequence, and the second DFB light source 130 includes a first luminous body layer, a waveguide layer, a grating layer, and a second luminous body layer stacked in sequence. The waveguide layer and the grating layer of the second DFB light source 130 are connected to the waveguide layer of the second DFB light source 130 of the next stage through the first waveguide connecting portion 110, and the grating layer of the first DFB light source 120 is connected to the waveguide layer of the first stage second DFB light source 130 through the first waveguide connecting portion 110. The first DFB light source 120 emits light waves through the first light-emitting layer and the second light-emitting layer, and the light waves emitted by the first light-emitting layer and the second light-emitting layer are laterally output to the first waveguide connecting portion 110 through the grating layer, and the light waves emitted by the first DFB light source 120 enter the waveguide layer of the second DFB light source 130, and are sequentially and laterally transmitted to the multiplexing module 200 through a plurality of first waveguide connecting portions 110 and a plurality of waveguide layers of the second DFB light sources 130. The second DFB light source 130 emits light waves through the first light-emitting layer and the second light-emitting layer. The light waves emitted by the first light-emitting layer and the second light-emitting layer are laterally output to the first waveguide connection portion 110 through the grating layer. The light waves emitted by the second DFB light source 130 enter the waveguide layer of the second DFB light source 130 of the next stage, and are sequentially transmitted to the wave combining module 200 through the waveguide layers of several second DFB light sources 130. The thickness of the waveguide layer of the second DFB light source 130 of the next stage is the sum of the thickness of the grating layer and the waveguide layer of the second DFB light source 130 of the previous stage, so that the grating layers of the second DFB light sources 130 of each stage are misaligned, and the light waves emitted by the second DFB light sources 130 of each stage can be laterally transmitted to the wave combining module 200, so that the light waves with multiple different central wavelengths generated by the DFB light source module are transmitted to the wave combining module 200 with minimum attenuation.

[0047] like Figure 4 As shown, the first DFB light source 120 further includes a Thermo Electric Cooler (TEC) layer, which is disposed on the second luminous body layer of the first DFB light source 120. The TEC layer dissipates heat for the first DFB light source 120 to ensure the performance of the first DFB light source 120.

[0048] like Figure 4 As shown, the second DFB light source 130 further includes a TEC layer, which is disposed on the second luminous body layer of the second DFB light source 130. The TEC layer dissipates heat for the second DFB light source 130 to ensure the performance of the second DFB light source 130.

[0049] like Figure 3As shown, the optical wave amplification module includes a first SOA 300 and a second SOA 310. The output end of the combiner module 200 is connected to the input end of the first SOA 300, and the output end of the first SOA 300 is connected to the input end of the second SOA 310. The output end of the second SOA 310 is used to output the optical wave. The first SOA 300 and the second SOA 310 amplify the optical wave to reduce the attenuation of the optical wave transmitted in the first waveguide connection part 110 and the combiner module 200. Figure 5 As shown, the first SOA 300 and the second SOA 310 have different central wavelengths, and can amplify light waves of different wavelengths, so that light waves of different wavelengths are amplified to a similar degree, thereby reducing the energy difference between light waves of different wavelengths, outputting light wave energy steadily, and reducing the difficulty of optical fiber coding identification. It should be noted that the light wave amplification module can also increase or decrease the number of SOAs according to the application scenario.

[0050] like Figure 3 As shown, a second waveguide connecting portion 400 is further included, and the output end of the first SOA 300 is connected to the input end of the second SOA 310 through the second waveguide connecting portion 400 .

[0051] like Figure 4 As shown, it also includes a substrate 500, and a plurality of light source units 100, a wave combining module 200 and a light wave amplifying module are all arranged on the substrate 500, so as to realize integration and reduce the cost. The substrate 500 is a silicon substrate.

[0052] like Figure 6 As shown, according to the DFB array coupled adjustable light source fiber coding demodulation system of the second aspect of the present invention, it includes: the above-mentioned DFB array coupled adjustable light source, a control module 600, a circulator 700, an optical fiber 800 with optical fiber coding and a photoelectric collection module, the output end of the control module 600 is electrically connected to the control end of the DFB array coupled adjustable light source to control the DFB array coupled adjustable light source to emit light waves with different central wavelengths, the output end of the DFB array coupled adjustable light source is connected to the first port of the circulator 700, the second port of the circulator 700 is connected to one end of the optical fiber 800, the other end of the optical fiber 800 is used to connect to the terminal communication device, the third port of the circulator 700 is connected to the input end of the photoelectric collection module, and the output end of the photoelectric collection module is electrically connected to the input end of the control module 600.

[0053] A plurality of DFB light source modules of the DFB array coupled adjustable light source are connected in series through the first waveguide connection part 110, and a plurality of light source units 100 are connected in parallel to the wave combining module 200 to form a DFB light source array. Light waves with different central wavelengths are generated by controlling different DFB light source modules to work. Light waves with different central wavelengths output by the plurality of light source modules are combined by the wave combining module 200 and then pass through the light wave amplification module. The light wave amplification module amplifies the light waves and then outputs them, thereby reducing the attenuation generated by the transmission of the light waves in the first waveguide connection part 110 and the wave combining module 200. The plurality of SOAs with different central wavelengths in the light wave amplification module can amplify light waves of different wavelength bands, so that light waves of different wavelength bands are amplified to a similar degree, thereby reducing the energy difference between light waves of different wavelength bands, and the output light wave energy is stable, thereby reducing the difficulty of optical fiber coding recognition.

[0054] The control module 600 obtains a fiber coding information table, which includes a mapping relationship between fiber coding information and the center wavelength, reflected energy and distance of the light wave. The control module 600 controls the light source unit 100 to emit light waves with different center wavelengths, and at the same time collects the wavelength and energy of the light wave through the photoelectric collection module and records the collection time. The control module 600 calculates the center wavelength, reflected energy and distance of the light wave according to the collection time, wavelength and energy of the light wave. The control module 600 determines the fiber coding information according to the fiber coding information table and the center wavelength, reflected energy and distance of the light wave.

[0055] like Figure 6 As shown, the photoelectric acquisition module includes a photoelectric conversion module 900 and an AD acquisition module 910. The third port of the circulator 700 is connected to the input end of the photoelectric conversion module 900, the output end of the photoelectric conversion module 900 is electrically connected to the input end of the AD acquisition module 910, and the output end of the AD acquisition module 910 is electrically connected to the input end of the control module 600. The photoelectric conversion module 900 converts the optical signal into an electrical signal and outputs it to the AD acquisition module 910. The AD acquisition module 910 collects the electrical signal and transmits it to the control module 600, and the control module 600 parses the data information. The photoelectric conversion module 900 is an avalanche photo diode (APD), which also has a signal gain function and can amplify the light wave.

[0056] like Figure 7 As shown, according to the DFB array coupled adjustable light source optical fiber coding demodulation method of the third aspect of the present invention,

[0057] The following steps are involved:

[0058] S100, obtaining an optical fiber coding information table, where the optical fiber coding information table includes a mapping relationship between optical fiber coding information and a central wavelength of a light wave, reflected energy, and distance;

[0059] S200, emitting light waves through the light source unit 100, and collecting the wavelength and energy of the light waves through the photoelectric collection module and recording the collection time;

[0060] S300, calculating the central wavelength, reflection energy and distance of the light wave according to the acquisition time, wavelength and energy of the light wave, the specific method is: forming a three-dimensional data group with the acquisition time as the X coordinate, the wavelength of the light wave as the Y coordinate, and the energy of the light wave as the Z coordinate, the light wave data with the same acquisition time are the same optical fiber coded reflection, the central wavelength and reflection energy of the light wave are calculated according to the energy difference, and the distance is calculated according to the acquisition time;

[0061] S400, determining the optical fiber coding information according to the optical fiber coding information table and the central wavelength of the light wave, the reflected energy and the distance.

[0062] A plurality of DFB light source modules of the DFB array coupled adjustable light source are connected in series through the first waveguide connection part 110, and a plurality of light source units 100 are connected in parallel to the wave combining module 200 to form a DFB light source array. Light waves with different central wavelengths are generated by controlling different DFB light source modules to work. Light waves with different central wavelengths output by the plurality of light source modules are combined by the wave combining module 200 and then pass through the light wave amplification module. The light wave amplification module amplifies the light waves and then outputs them, thereby reducing the attenuation generated by the transmission of the light waves in the first waveguide connection part 110 and the wave combining module 200. The plurality of SOAs with different central wavelengths in the light wave amplification module can amplify light waves of different wavelength bands, so that light waves of different wavelength bands are amplified to a similar degree, thereby reducing the energy difference between light waves of different wavelength bands, and the output light wave energy is stable, thereby reducing the difficulty of optical fiber coding recognition.

[0063] The control module 600 obtains a fiber coding information table, which includes a mapping relationship between fiber coding information and the central wavelength, reflected energy and distance of the light wave. The control module 600 controls the light source unit 100 to emit light waves with different central wavelengths, and at the same time collects the wavelength and energy of the light wave through the photoelectric collection module and records the collection time. The control module 600 calculates the central wavelength, reflected energy and distance of the light wave according to the collection time, wavelength and energy of the light wave. The control module 600 determines the fiber coding information according to the fiber coding information table and the central wavelength, reflected energy and distance of the light wave, thereby realizing the fiber coding and decoding function.

[0064] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. DFB array coupled tunable light source, characterized in that: include: A plurality of light source units (100), the light source units (100) comprising a first waveguide connecting portion (110) and a plurality of DFB light source modules connected in series via the first waveguide connecting portion (110), and used for generating light waves with different central wavelengths; A wave combining module (200), wherein the output ends of a plurality of the light source units (100) are connected to the input end of the wave combining module (200) for combining light waves; A light wave amplification module, the light wave amplification module comprising a plurality of SOAs connected in series, each SOA having a different central wavelength for amplifying light waves of different wavelength bands, the output end of the wave combining module (200) being connected to the input end of the first stage SOA, and the output end of the last stage SOA being used for outputting light waves; The DFB light source module comprises a first DFB light source (120) and a plurality of second DFB light sources (130); the first DFB light source (120) comprises a first luminous body layer, a grating layer and a second luminous body layer stacked in sequence; the second DFB light source (130) comprises a first luminous body layer, a waveguide layer, a grating layer and a second luminous body layer stacked in sequence; the waveguide layer and the grating layer of the second DFB light source (130) are connected to the waveguide layer of the second DFB light source (130) of the next stage via the first waveguide connecting portion (110); and the grating layer of the first DFB light source (120) is connected to the waveguide layer of the second DFB light source (130) of the first stage via the first waveguide connecting portion (110).

2. The DFB array coupled tunable light source according to claim 1, characterized in that: The first DFB light source (120) further comprises a TEC layer, wherein the TEC layer is disposed on the second luminous body layer of the first DFB light source (120).

3. The DFB array coupled tunable light source according to claim 1, characterized in that: The second DFB light source (130) further comprises a TEC layer, wherein the TEC layer is disposed on the second luminous body layer of the second DFB light source (130).

4. The DFB array coupled tunable light source according to claim 1, characterized in that: The optical wave amplification module comprises a first SOA (300) and a second SOA (310), the output end of the wave combining module (200) is connected to the input end of the first SOA (300), the output end of the first SOA (300) is connected to the input end of the second SOA (310), and the output end of the second SOA (310) is used to output optical waves.

5. The DFB array coupled tunable light source according to claim 4, characterized in that: It also includes a second waveguide connecting portion (400), and the output end of the first SOA (300) is connected to the input end of the second SOA (310) through the second waveguide connecting portion (400).

6. The DFB array coupled tunable light source according to claim 1, characterized in that: It also comprises a substrate (500), on which a plurality of the light source units (100), the wave combining modules (200) and the light wave amplifying modules are all arranged. 7.DFB array coupled adjustable light source optical fiber coding demodulation system, characterized in that: include: The DFB array coupled tunable light source according to any one of claims 1 to 6; A control module (600), wherein an output end of the control module (600) is electrically connected to a control end of the DFB array coupled tunable light source so as to control the DFB array coupled tunable light source to emit light waves with different central wavelengths; A circulator (700), wherein the output end of the DFB array coupled with the adjustable light source is connected to a first port of the circulator (700); An optical fiber (800) with optical fiber coding, the second port of the circulator (700) being connected to one end of the optical fiber (800), and the other end of the optical fiber (800) being used to connect to a terminal communication device; A photoelectric collection module, wherein the third port of the circulator (700) is connected to the input end of the photoelectric collection module, and the output end of the photoelectric collection module is electrically connected to the input end of the control module (600).

8. The DFB array coupled adjustable light source optical fiber coding and demodulation system according to claim 7, characterized in that: The photoelectric acquisition module comprises a photoelectric conversion module (900) and an AD acquisition module (910); the third port of the circulator (700) is connected to the input end of the photoelectric conversion module (900); the output end of the photoelectric conversion module (900) is electrically connected to the input end of the AD acquisition module (910); and the output end of the AD acquisition module (910) is electrically connected to the input end of the control module (600).

9. A DFB array coupled adjustable light source optical fiber coding demodulation method, characterized in that: The DFB array coupled adjustable light source optical fiber coding demodulation system as claimed in claim 7 comprises the following steps: Obtaining an optical fiber coding information table, wherein the optical fiber coding information table includes a mapping relationship between the optical fiber coding information and the central wavelength, reflection energy and distance of the light wave; A light wave is emitted through a light source unit (100), and a photoelectric collection module is used to collect the wavelength and energy of the light wave and record the collection time; Calculate the central wavelength, reflected energy and distance of the light wave according to the acquisition time, wavelength and energy of the light wave; The optical fiber coding information is determined according to the optical fiber coding information table and the central wavelength of the light wave, the reflected energy and the distance.

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