Optical fiber and spectrometer

Abstract

The utility model provides an optical fiber and a spectrometer. The optical fiber includes a core and a cladding. The fiber core is a solid core, quantum dot film layers are integrated on the fiber core inlet end face and / or the fiber core outlet end face of the fiber core, the thickness of the quantum dot film layer at one end is smaller than 200 micrometers, the quantum dot film layers and the end face of the fiber core are directly attached together, and the fiber core is arranged in the wrapping layer. The spectrograph comprises a photoelectric detector and the optical fiber, and miniaturization of the spectrograph is facilitated. The quantum dot film layer and the end face of the fiber core are directly attached together, light is emitted from the optical fiber after being modulated by the quantum dot film layer, the conduction effect of the optical fiber and the modulation effect of the quantum dot film layer on light are combined into a whole, the integration degree is high, the structure is compact, miniaturization of a spectrograph is facilitated, and portability is improved.

Description

Technical Field

[0001] The present application relates to the field of spectral measurement, and in particular to optical fiber and spectrometer. Background Art

[0002] A spectrometer is an analytical instrument that can distinguish the intensity of light waves of different colors (wavelengths). In order to solve the problem that traditional spectrometers are too large to be moved, the prior art proposes a spectrometer based on quantum dots. However, in order to allow the optical path in the spectrometer to accurately pass through the relevant components (collimating lenses, beam splitters, reflectors, filter films, photodetectors, etc.), the position stability of various optical components in the optical path is required to be high.

[0003] The existing technology has set the optical path into a straight line to minimize the use of reflectors, keep the equipment stable, and have a relatively long service life. However, this design will limit the internal space of the spectrometer, which is not conducive to the miniaturization of the spectrometer and the positional freedom of the internal components.

[0004] The invention patent application with publication number CN109932058A discloses a miniature spectrometer based on an array filter, in which the positions of the optical elements are relatively fixed and the stability requirement is high; the optical path is set in a straight line, which is not conducive to miniaturization.

[0005] Therefore, there is still room for improvement in spectrometers. Utility Model Content

[0006] In order to improve or solve at least one problem raised by the background technology, the present application provides an optical fiber and a spectrometer.

[0007] The optical fibers provided in this application include:

[0008] A fiber core, wherein the fiber core is a solid core, a quantum dot film layer is integrated on a core inlet end face and / or a core outlet end face of the fiber core, a thickness of the quantum dot film layer at one end is less than 200 μm, and the quantum dot film layer is directly bonded to the end face of the fiber core;

[0009] A cladding, wherein the core is arranged in the cladding.

[0010] In at least one embodiment, the quantum dot film layer includes multiple first regions, at least some of which are provided with quantum dots, and the first regions are located at a first position of the quantum dot film layer corresponding to a first end face position of the core inlet end face and / or the core outlet end face.

[0011] In at least one embodiment, part of the first region is provided with the same or different quantum dots to form the same or different spectral channels at part of the first position; or

[0012] Each of the first regions is provided with the same or different quantum dots to form the same or different spectral channels at the first position.

[0013] In at least one embodiment, the quantum dot film layer also includes a second region, which is located at a second position of the quantum dot film layer corresponding to a second end face position of the core inlet end face and / or the core outlet end face, and the first position is different from the second position.

[0014] In at least one embodiment, some of the first regions are provided with the same or different quantum dots, other first regions are not provided with quantum dots, and the second regions are not provided with quantum dots, so as to form the same or different spectral channels at some of the first positions; or

[0015] The first regions are provided with the same or different quantum dots, and the second regions are not provided with the quantum dots, so as to form the same or different spectral channels at the first positions; or

[0016] The same or different quantum dots are arranged in each of the first regions and each of the second regions to form the same or different spectral channels at each of the first positions and each of the second positions.

[0017] In at least one embodiment, the shape of the first region and / or the second region includes at least one of a circle, a rectangle, a diamond, a polygon, and a strip.

[0018] In at least one embodiment, the optical fiber includes a first cladding and a plurality of cores disposed therein, the quantum dot film layer of each core forming a spectral channel, so that each core integrated with the quantum dot film layer forms a spectral channel, and the spectral channels in the optical fiber are the same, partially the same, or different.

[0019] In at least one embodiment, the optical fiber includes a first cladding and one or more cores disposed therein, and the quantum dot film layer of each core includes multiple different spectral channels, so that each core integrated with the quantum dot film layer includes multiple different spectral channels.

[0020] In at least one embodiment, the optical fiber includes multiple second claddings, each of which is provided with a core, and the quantum dot film layer of each core forms a spectral channel, so that each core integrated with the quantum dot film layer forms a spectral channel, and the spectral channels in the optical fiber are the same, partially the same, or different.

[0021] In at least one embodiment, the optical fiber includes multiple second claddings, each of which has a core disposed therein, and the quantum dot film layer of each core includes multiple different spectral channels, so that each core integrated with the quantum dot film layer includes multiple different spectral channels.

[0022] In at least one embodiment, the quantum dot film layer is integrated on both the core inlet end face and the core outlet end face, and the quantum dot film layer on the core inlet end face and the quantum dot film layer on the core outlet end face are the same or different.

[0023] In at least one embodiment, a plurality of quantum dot film layers are disposed on the end face of the fiber core, and the plurality of quantum dot film layers include a filter layer for filtering light and / or a splitting layer for splitting light.

[0024] The spectrometer provided in this application includes:

[0025] An optical fiber as previously described;

[0026] A photoelectric detector, wherein the core outlet end face on the optical fiber faces the receiving side of the photoelectric detector, the core outlet end face is provided with the quantum dot film layer, and the quantum dot film layer is connected to the receiving side of the photoelectric detector.

[0027] The implementation method of the present application transmits light through optical fiber, and the optical path where the optical fiber is located can be appropriately bent, which is conducive to the miniaturization of the spectrometer. The implementation method of the present application directly adheres the quantum dot film layer to the end face of the fiber core, and the light is modulated by the quantum dot film layer before it is emitted from the optical fiber. There is no need to set a collimating lens between the end face of the fiber core and the quantum dot film layer, and the overall structure is more compact. The quantum dot film layer fits tightly with the fiber core, combining the conduction function of the optical fiber and the modulation function of the quantum dot film layer on light into one, without the need for alignment installation, with a higher degree of integration, which is conducive to the miniaturization of the spectrometer and improves portability.

[0028] The spectrometer provided in the present application includes the above-mentioned optical fiber and thus also has the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of an optical fiber according to a first embodiment of the present application is shown.

[0030] Figure 2 A schematic structural diagram of an optical fiber according to a second embodiment of the present application is shown.

[0031] Figure 3 A schematic diagram of the end face structure of an optical fiber according to a third embodiment of the present application is shown.

[0032] Figure 4A schematic diagram of the end face structure of an optical fiber according to the fourth embodiment of the present application is shown.

[0033] Figures 5 to 8 A schematic diagram of the layout of spectral channels in a quantum dot film layer according to an embodiment of the present application is shown.

[0034] Description of Reference Numerals

[0035] 100 fiber core; 110 fiber core entrance end face; 120 fiber core exit end face;

[0036] 200 quantum dot film layers;

[0037] 300 cladding; 310 cladding end face; 320 first cladding; 330 second cladding;

[0038] 400 1st area;

[0039] 500 Second area. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0041] Optical fiber is a fiber made of glass or plastic that can be bent, making it easy to build optical paths and reduce the complex and dense optical paths in spectrometers. Quantum dots are quasi-zero-dimensional semiconductor nanocrystals with a radius smaller than or close to the exciton Bohr radius. The response characteristics of quantum dots to light can be precisely controlled by regulating the type and / or size of quantum dots.

[0042] Based on optical fiber and quantum dots, the present application provides an optical fiber and a spectrometer.

[0043] See also Figure 1 , Figure 2 The optical fiber may include a core 100 and a cladding 300, wherein the core 100 may be a solid core, and a quantum dot film layer 200 is integrated on the core entrance end face 110 and / or the core exit end face 120 of the core 100. The quantum dot film layer 200 is directly bonded to the end face of the core 100.

[0044] The quantum dot film layer 200 may include quantum dots. For example, the present application may utilize the absorption characteristics, fluorescence characteristics, etc. of quantum dots to have a light modulation function. Preferably, the present application utilizes the absorption characteristics of quantum dots. The quantum dots may be BaS (barium sulfide), AgInS 2 (Silver Indium Sulfide), NaCl (Sodium Chloride), Fe 2 O 3 (Iron Oxide), In2 O 3 (Indium Oxide), InAs (Indium Arsenide), InN (Indium Nitride), InP (Indium Phosphide), CdS (Cadmium Sulfide), CdSe (Cadmium Selenide), CdTe (Cadmium Telluride), ZnS (Zinc Sulfide), ZnSe (Zinc Selenide), ZnTe (Zinc Telluride), GaAs (Gallium Arsenide), GaN (Gallium Nitride), GaS (Gallium Sulfide), GaSe (Gallium Selenide), InGaAs (Indium Gallium Arsenide), MgS (Magnesium Sulfide), MgSe (Magnesium Selenide), MgTe (Magnesium Telluride), PbS (Lead Sulfide), PbSe (Lead Selenide), PbTe (Lead Telluride), Cd(S x Se 1-x )(CdSSe), BaTiO 3 (barium titanate), PbZrO 3 (Lead zirconate), CsPbCl 3 (cesium lead chloride), CsPbBr 3 (cesium lead bromide), CsPbI 3 (cesium lead iodide). The concentration and diameter of the quantum dots can meet the requirements of the spectroscopic film layer. For example, the concentration can be (0.6-5.0)×10 24 m -3 The diameter can be 1.9 to 9 nm, and the radiation and absorption in the ultraviolet, visible and infrared bands cover the wavelength band of 250 to 2340 nm.

[0045] The thickness of the quantum dot film layer 200 at one end may be less than 200 μm. Exemplarily, when both the core inlet end face 110 and the core outlet end face 120 are provided with a quantum dot film layer 200, the thickness of the quantum dot film layer 200 at the core inlet end face 110 and the quantum dot film layer 200 at the core outlet end face 120 are both less than 200 μm. In one example of the present application, the thickness of the quantum dot film layer 200 at one end may be less than 60 μm. In one example of the present application, the thickness of the quantum dot film layer 200 at one end may be 10 to 50 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc. In one example of the present application, the thickness of the quantum dot film layer 200 at one end may be 20 to 30 μm, for example, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, etc.

[0046] A multi-layer quantum dot film layer 200 may be provided on the end face of the core 100. The multi-layer quantum dot film layer 200 may include a filter layer for filtering light, a spectroscopic layer for spectroscopic and other layers. Preferably, the quantum dot film layer 200 includes a filter layer and a spectroscopic layer. The quantum dots on the filter layer for filtering light may be the same kind of quantum dots, and the quantum dots on the spectroscopic layer for spectroscopic are different kinds of quantum dots. The filter layer allows light of a specific wavelength to pass through, while absorbing or reflecting light of other wavelengths. The spectroscopic layer allows light of multiple different wavelength bands to pass through. Of course, the quantum dot film layer 200 may be composed of a single layer or a multi-layer. When a multi-layer quantum dot film layer 200 is provided at one end of the core 100, the total thickness of the multi-layer quantum dot film layer 200 at one end may be less than 200 μm. Preferably, the total thickness of the multi-layer quantum dot film layer 200 at one end of the core 100 may be less than 60 μm. When the quantum dot film layer 200 at one end of the fiber core 100 is composed of a single layer, the thickness of the quantum dot film layer 200 may be less than 60 μm.

[0047] The inlet end face and the outlet end face (i.e., the cross section) of the fiber core 100 may be circular, square, or other shapes. The shape of the quantum dot film layer integrated on the inlet end face and / or the outlet end face of the fiber core may be the same, which may be circular, square, or other shapes. Figure 5 , the quantum dot film layer 200 may include a plurality of first regions 400 .

[0048] In one embodiment of the present application, see Figure 5 , the quantum dot film layer 200 has and only has a first region 400. At least part of the first region 400 is provided with quantum dots, for example Figure 5 The black blocks in the figure indicate that quantum dots are provided, the white blocks indicate that quantum dots are not provided, and the black blocks are surrounded by white blocks, so that the area where the quantum dots represented by the black blocks are located can form a spectral channel, and no crosstalk occurs between adjacent spectral channels. The first region 400 is located at a first position of the quantum dot film layer 200 corresponding to the first end face position of the core inlet end face 110 and / or the core outlet end face 120. It can be understood that in the quantum dot film layer 200, the position where the first region 400 is located is called the first position of the quantum dot film layer 200. On the end face of a core 100 corresponding to the quantum dot film layer 200, the end face position corresponding to the first region 400 is called the first end face position of the core.

[0049] Of course, each first region 400 can be provided with the same quantum dots (not shown in the figure) to form the same spectral channel at the first position, and the same spectral channels are synthesized into one spectral channel, so that the quantum dot film layer 200 forms one spectral channel. Each first region 400 can also be provided with different quantum dots (not shown in the figure) to form different spectral channels at the first position, so that the quantum dot film layer 200 forms multiple spectral channels.

[0050] You can also use Figure 5 The first row, the third row, etc. are provided with the same quantum dots, and the second row, the fourth row, etc. are not provided with quantum dots. The second row, the fourth row, etc. without quantum dots do not form a spectral channel. The first row, the third row, etc. form the same spectral channel in rows. The same spectral channels can be synthesized into one spectral channel, so that the quantum dot film layer 200 forms one spectral channel. When the first row, the third row, etc. are provided with different quantum dots, and the second row, the fourth row are not provided with quantum dots, the second row, the fourth row without quantum dots do not form a spectral channel. The first row, the third row, etc. form different spectral channels in rows, so that the quantum dot film layer 200 forms a plurality of different spectral channels.

[0051] In one embodiment of the present application, see Figure 6 , the quantum dot film layer 200 may also include a second region 500, and the second region 500 is located at a second position of the quantum dot film layer 200 corresponding to the second end face position of the core inlet end face 110 and / or the core outlet end face 120. It can be understood that in the quantum dot film layer 200, the position where the second region 500 is located is called the second position of the quantum dot film layer 200. And on the end face of a core 100 corresponding to the quantum dot film layer 200, the end face position corresponding to the second region 500 is called the second end face position of the core. Among them, the first position is different from the second position. That is, Figure 6 The rectangular areas in the figure may represent the first area 400 , and the blank areas between the rectangular areas may represent the second area 500 .

[0052] In one embodiment of the present application, see Figure 6 , some of the first regions 400 are provided with the same or different quantum dots, other first regions 400 are not provided with quantum dots, and the second regions 500 are not provided with quantum dots, so as to form the same or different spectral channels at some of the first positions. For example, the black rectangular region is the first region 400 provided with quantum dots, and the white rectangular region is the first region 400 not provided with quantum dots. The layout of various spectral channels is formed according to the same or different quantum dots (described later).

[0053] In one embodiment of the present application, see Figure 7, the same or different quantum dots are arranged in each first region 400, and no quantum dots are arranged in the second region 500, so as to form the same or different spectral channels in the first position. When the same spectral channel is formed in each first position, the same spectral channel can be merged into one spectral channel, so that one spectral channel is formed in the quantum dot film layer; when different spectral channels are formed in each first position, a plurality of different spectral channels are formed in the quantum dot film layer.

[0054] In one embodiment of the present application, the same or different quantum dots are arranged in each first region 400 and each second region 500 to form the same or different spectral channels at the first position and the second position. When the first position and the second position form the same spectral channel, the same spectral channel can be merged into one spectral channel, so that one spectral channel is formed in the quantum dot film layer; when the first position and the second position form different spectral channels, multiple different spectral channels are formed in the quantum dot film layer.

[0055] The shape of the first region 400 includes at least one of a circle, a rectangle, a diamond, a polygon, and a strip.

[0056] In one embodiment of the present application, see Figure 8 , the second region 500 may also be formed as a structure around the first region 400. The shape of the second region 500 may also include at least one of a circle, a rectangle, a diamond, a polygon, and a strip. The shapes of the first region 400 and the second region 500 may be the same or different. Of course, for example Figure 7 As shown, when the shape of the second area 500 is complementary to the shape of the first area 400, the shape of the second area 500 can be considered to be a collection of multiple rectangles. Therefore, the shape of the second area 500 can also be called to include at least one of a circle, a rectangle, a diamond, a polygon, and a strip.

[0057] It can be understood that the same spectral channel can be formed by the same kind of quantum dots of the same type and size, and different spectral channels can be formed by different quantum dots (of different types and / or sizes).

[0058] When quantum dots are not provided in the first region 400 and the second region 500, the positions thereof may be gaps or filled with materials. The filling material may be a light-transmitting material or an opaque material, and the signal corresponding to the intensity of light transmitted from the second region may be used to calibrate the spatial distribution of intensity.

[0059] The fiber core 100 may be disposed in the cladding 300 , and the cladding end face 310 of the cladding 300 may be circular. The cladding end face 310 may include a core entrance end face 110 and a core exit end face 120 , so that the optical fiber provided in the present application may be processed based on an ordinary cylindrical optical fiber.

[0060] It can be understood that the light at the output end of the optical fiber appears as a diffusely reflected beam with a large light spot. When directly replacing the optical path on the existing spectrometer with optical fiber, the light at the outlet of the optical fiber needs to be collimated before passing through the quantum dot film layer 200. However, the present application directly integrates the quantum dot film layer 200 on the end face of the fiber core 100, and there is no need to set a collimating lens between the optical fiber and the quantum dot film layer 200, and they are directly bonded together, and the overall structure is more compact. The quantum dot film layer 200 and the optical fiber do not need to be installed in alignment, and the integration is higher, which is conducive to the miniaturization of the spectrometer and improves portability.

[0061] A single quantum dot film layer 200 may contain the same quantum dots to form a spectral channel. Based on this, multiple fiber cores 100 may be integrated, and the spectral channels of the quantum dot film layer 200 on each fiber core 100 are different, thereby forming an optical fiber with multiple spectral channels.

[0062] Alternatively, a single quantum dot film layer 200 includes multiple quantum dots to form multiple different spectral channels. Based on this, a single fiber core 100 can have multiple different spectral channels.

[0063] An optical fiber may have one core 100 or multiple cores 100 to further increase the number of spectral channels. For example, the number of spectral channels in the optical fiber provided by the present application may be greater than 4. Furthermore, the number of spectral channels in the optical fiber may be greater than 10.

[0064] In one embodiment of the present application, see Figure 3 The optical fiber includes a first cladding 320 and a plurality of cores 100, and the plurality of cores 100 are arranged in the first cladding 320. The quantum dot film layer 200 of each core 100 forms a spectral channel, so that each core 100 integrated with the quantum dot film layer 200 forms a spectral channel, and the spectral channels in the optical fiber are the same, partially the same, or different.

[0065] Based on the array of rows and columns of the fiber core 100, the spectral channels of the quantum dot film layer 200 can form a filter array. For example, see Figure 3 , 13 fiber cores 100 can be arranged in the first cladding 320, which are regularly arranged in 5 rows and 5 columns, and the spacing between adjacent fiber cores 100 is the same or approximately the same, so that the 13 spectral channels formed by the quantum dot film layers 200 respectively integrated on the 13 fiber cores 100 can also be formed into a regularly arranged filter array, which is convenient for cooperating with the photosensitive array on the image sensor. Of course, the fiber cores 100 can also be arranged in other ways so that the spectral channels have other types of arrangements. It can be understood that the optical fiber can also have conventional structures such as a coating layer and an outer sheath, which will not be described in detail in this application.

[0066] In one embodiment of the present application, the optical fiber may include a first cladding 320 and one or more cores 100 arranged therein, and the quantum dot film layer 200 of each core 100 includes multiple different spectral channels, so that each core 100 integrated with the quantum dot film layer 200 includes multiple different spectral channels.

[0067] In one embodiment of the present application, see Figure 4 The optical fiber includes a plurality of second claddings 330, and a core 100 is disposed in each second cladding 330. The quantum dot film layer 200 of each core 100 forms a spectral channel, so that each core 100 integrated with the quantum dot film layer 200 forms a spectral channel, and the spectral channels in the optical fiber are the same, partially the same, or different.

[0068] Based on the circumferential arrangement of the fiber core 100, the spectral channels of the quantum dot film layer 200 integrated on the fiber core 100 can form a filter array. Figure 4 The optical fiber in this embodiment may include 8 second claddings 330 and 8 fiber cores 100 arranged in a circumferential array, and has 8 spectral channels arranged in a circumferential array. The optical fiber configuration is similar to an optical cable, wherein conventionally arranged reinforcing cores, fillers and other structures are not described in detail in this application.

[0069] In one embodiment of the present application, the optical fiber includes a plurality of second claddings 330, a core 100 is disposed in each second cladding 330, and the quantum dot film layer 200 of each core 100 includes a plurality of spectral channels, so that each core 100 integrated with a quantum dot film layer 200 includes a plurality of different spectral channels.

[0070] It can be understood that after setting up multiple quantum dot film layers 200 arrays, the response of each area in the quantum dot filter array to light can be extracted through a photodetector, and then through data processing and calculation, the light intensity of each wavelength can be inverted, thereby realizing spectral detection.

[0071] The core inlet end face 110 and the core outlet end face 120 may both be integrated with quantum dot film layers 200 , and the quantum dot film layer 200 on the core inlet end face 110 and the quantum dot film layer 200 on the core outlet end face 120 may be the same or different.

[0072] For example, a quantum dot film layer 200 with the same filtering wavelength can be provided on the inlet end face 110 and the outlet end face 120 to ensure that only optical signals of a specific wavelength pass through, thereby reducing noise and interference and improving the purity of the optical signal. In addition, the use of the same quantum dot film layer 200 can simplify the design of the optical fiber and facilitate integration. For example, it can be used in an optical fiber communication system to reduce signal attenuation and dispersion and improve transmission quality in long-distance communications.

[0073] If quantum dot film layers 200 with different wavelengths are arranged on the inlet end face 110 and the outlet end face 120, the inlet end face 110 will first filter out the unnecessary wavelengths, and then the outlet end face 120 will also filter out the unnecessary wavelengths. By utilizing the selectivity of different quantum dot film layers 200 for wavelengths, multi-channel transmission can be achieved in the same optical fiber to improve spectrum efficiency. For example, in an optical fiber sensor, sensing can be performed by light of a specific wavelength, and different quantum dot film layers 200 can improve the sensitivity and selectivity of the sensor.

[0074] Providing the quantum dot film layer 200 at both ends can more effectively filter out unwanted wavelengths, ensuring that only light signals of specific wavelengths pass through, thereby improving the purity of the signal. In addition, the quantum dot film layer 200 at the outlet end face 120 can reduce the reflection of the light signal back to the inlet end face 110, reducing the back reflection in the optical fiber. Providing the quantum dot film layer 200 at only one end of the optical fiber can reduce the complexity and cost of the optical fiber system. For example, in an optical fiber amplifier, a quantum dot film layer 200 is provided at the input end to protect the amplifier from the influence of light of unwanted wavelengths.

[0075] It can be understood that the current preparation methods of quantum dot-doped optical fibers mainly include melt drawing and colloidal filling. The melt drawing method is a traditional method, but for glass substrate materials, the melt drawing method has problems such as secondary growth of quantum dots and photon darkening under pumping conditions. The colloidal filling method is a method of using existing hollow core optical fibers or microstructured optical fibers to fill or assemble liquid or colloidal quantum dots to form quantum dot-doped optical fibers. It needs to consider issues such as the refractive index matching of the substrate material of the quantum dot sol and the difficulty of infusion.

[0076] The embodiment of the present application only integrates the quantum dot film layer 200 on the end face of the fiber core 100, rather than integrating the quantum dots in the optical fiber, which can avoid the complex problems of the traditional quantum dot and optical fiber integration process and is easy to process. The quantum dot film layer 200 can be integrated on the end face of the fiber core 100 using a processing technology commonly used in the art. Exemplarily, the integration method can include spin coating, inkjet printing, etc.

[0077] For example, an inkjet device may be used to print a quantum dot material to a designated location on the end face of an optical fiber (eg, where a certain fiber core 100 is located).

[0078] The spectrometer provided in the embodiment of the present application may include a photodetector and the aforementioned optical fiber. The core outlet end face 120 on the optical fiber faces the receiving side (target surface) of the photodetector. Exemplarily, the photodetector may be a CCD (charge coupled device) image sensor, a CMOS (complementary metal oxide semiconductor) image sensor, etc.

[0079] The light transmitted through the object to be tested, or the light reflected and scattered after irradiating the object to be tested, propagates through the optical fiber, and can be filtered by the quantum dot film layer 200 on the end face of the fiber core 100, and then received by the photodetector to obtain the wavelength intensity spectrum of the light after filtering by the quantum dot film layer 200 of each fiber core 100. By calculating the wavelength intensity spectrum, the spectrum information of the object to be tested can be obtained, and the spectrum measurement can be realized.

[0080] In one embodiment of the present application, the quantum dot film layer 200 is connected to the receiving side of the photodetector, for example, by gluing or other types of fasteners to achieve packaging and fixing of the quantum dot filter array and the photodetector.

[0081] The above is a preferred embodiment of the present application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An optical fiber, characterized in that: include: A fiber core, wherein the fiber core is a solid core, a quantum dot film layer is integrated on a core inlet end face and / or a core outlet end face of the fiber core, a thickness of the quantum dot film layer at one end is less than 200 μm, and the quantum dot film layer is directly bonded to the end face of the fiber core; A cladding, wherein the core is arranged in the cladding.

2. The optical fiber according to claim 1, characterized in that The quantum dot film layer includes a plurality of first regions, at least some of which are provided with quantum dots, and the first regions are located at first positions of the quantum dot film layer corresponding to first end face positions of the fiber core inlet end face and / or the fiber core outlet end face.

3. The optical fiber according to claim 2, characterized in that Part of the first regions are provided with the same or different quantum dots to form the same or different spectral channels at part of the first positions; or Each of the first regions is provided with the same or different quantum dots to form the same or different spectral channels at the first position.

4. The optical fiber according to claim 2, characterized in that The quantum dot film layer also includes a second region, which is located at a second position of the quantum dot film layer corresponding to a second end face position of the core inlet end face and / or the core outlet end face, and the first position is different from the second position.

5. The optical fiber according to claim 4, characterized in that Part of the first regions are provided with the same or different quantum dots, another part of the first regions are not provided with quantum dots, and the second regions are not provided with quantum dots, so as to form the same or different spectral channels at part of the first positions; or The first regions are provided with the same or different quantum dots, and the second regions are not provided with the quantum dots, so as to form the same or different spectral channels at the first positions; or The same or different quantum dots are arranged in each of the first regions and each of the second regions to form the same or different spectral channels at each of the first positions and each of the second positions.

6. The optical fiber according to claim 4, characterized in that The shape of the first area and / or the second area includes at least one of a circle, a rectangle, a diamond, a polygon, and a strip.

7. The optical fiber according to claim 3 or 5, characterized in that: The optical fiber includes a first cladding and a plurality of cores arranged therein, the quantum dot film layer of each core forms a spectral channel, so that each core integrated with the quantum dot film layer forms a spectral channel, and the spectral channels in the optical fiber are the same, partially the same, or different.

8. The optical fiber according to claim 3 or 5, characterized in that: The optical fiber includes a first cladding and one or more cores arranged therein, and the quantum dot film layer of each core includes multiple different spectral channels, so that each core integrated with the quantum dot film layer includes multiple different spectral channels.

9. The optical fiber according to claim 3 or 5, characterized in that: The optical fiber includes multiple second claddings, each of which is provided with a core, and the quantum dot film layer of each core forms a spectral channel, so that each core integrated with the quantum dot film layer forms a spectral channel, and the spectral channels in the optical fiber are the same, partially the same, or different.

10. The optical fiber according to claim 3 or 5, characterized in that: The optical fiber includes multiple second claddings, each of which has a core disposed therein, and the quantum dot film layer of each core includes multiple different spectral channels, so that each core integrated with the quantum dot film layer includes multiple different spectral channels.

11. The optical fiber according to claim 1, characterized in that The quantum dot film layer is integrated on both the core inlet end face and the core outlet end face, and the quantum dot film layer on the core inlet end face and the quantum dot film layer on the core outlet end face are the same or different.

12. The optical fiber according to claim 1, characterized in that The end face of the fiber core is provided with multiple layers of the quantum dot film layer, and the multiple layers of the quantum dot film layer include a filter layer for filtering light and / or a splitting layer for splitting light.

13. A spectrometer, characterized in that: include: The optical fiber according to any one of claims 1 to 12; A photoelectric detector, wherein the core outlet end face on the optical fiber faces the receiving side of the photoelectric detector, the core outlet end face is provided with the quantum dot film layer, and the quantum dot film layer is connected to the receiving side of the photoelectric detector.

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