A heavy water vapor displacement device, a spectral measurement system and a method for reducing water peak absorption loss of a hollow core optical fiber

Abstract

The present application relates to the technical field of optical fiber manufacturing, and discloses a heavy water vapor displacement device, a spectrum measurement system and a method for reducing water peak absorption loss of a hollow-core optical fiber. The method for reducing water peak absorption loss of a hollow-core optical fiber is realized by using the heavy water vapor displacement device, and the effectiveness is verified by the spectrum measurement system. The heavy water vapor displacement device comprises a steam generating assembly, a first gas cavity assembly and a gas extraction assembly. The gas extraction assembly first extracts vacuum in the fiber core. The steam generating assembly generates heavy water vapor, and fills the fiber core of the hollow-core optical fiber with the heavy water vapor through the first gas cavity assembly. The heavy water vapor is prevented from mixing with the gas remaining in the fiber core, the heavy water vapor is ensured to completely fill the fiber core of the hollow-core optical fiber, the absorption peak is weakened, and especially the interference on S-band communication is greatly reduced. The hydroxyl group formed by the heavy water molecules has stable chemical properties, effectively delays the secondary adsorption of ordinary water vapor, and improves the transmission performance of the optical fiber.

Description

Technical Field

[0001] This invention relates to the field of optical fiber manufacturing technology, and in particular to a heavy water vapor replacement device, a spectral measurement system, and a method for reducing water peak absorption loss in hollow optical fibers. Background Technology

[0002] In long-distance communication applications, the water peak absorption loss of hollow optical fibers cannot be ignored, as it will affect the transmission performance of optical fiber communication systems.

[0003] The absorption loss of hollow-core optical fiber includes the absorption loss of the glass material forming the fiber core and the absorption loss of gas molecules within the fiber core. The absorption loss of the glass material mainly comes from the absorption loss of hydroxyl ions, while the absorption loss of gas molecules mainly comes from the absorption loss of water vapor. Hydroxyl ions and water vapor absorb electromagnetic radiation by forming multiple absorption peaks through rotational transitions and intermolecular vibrations and their combinations. The absorption effect is particularly significant for electromagnetic waves in the E-band (1360nm-1460nm) and the S-band (1460nm-1530nm), forming a "water peak effect" that causes distortion in communication signals.

[0004] In existing technologies, there are two solutions to reduce water peak absorption loss in hollow-core optical fibers: the first is to perform hydroxyl removal treatment during the glass material preparation stage; the second is to purge the fiber core with dry inert gas or nitrogen. However, both methods are insufficient to completely remove moisture from the fiber core. Furthermore, during the use of the optical fiber, moisture from the environment may re-enter the fiber core, causing repeated water peak absorption loss due to the "water peak effect," making complete elimination difficult.

[0005] Therefore, there is an urgent need to provide a heavy water vapor replacement device, a spectral measurement system, and a method to reduce the water peak absorption loss of hollow optical fibers in order to solve the above problems. Summary of the Invention

[0006] Based on the above, the first objective of the present invention is to provide a heavy water vapor replacement device to at least solve one of the above-mentioned problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A heavy water vapor replacement device, comprising:

[0009] The air extraction component is capable of extracting the gas remaining inside the core of the hollow optical fiber.

[0010] A steam generation assembly includes a liquid storage container and a bubbler. The liquid storage container contains liquid water in a sealed cavity. The liquid water is either ordinary liquid water or heavy liquid water. The bubbler is capable of introducing purge gas into the liquid water.

[0011] The first gas chamber assembly includes an optical fiber docking assembly, an air connector, and a T-tube. The two opposite ends of the optical fiber docking assembly can be connected to hollow optical fibers and solid optical fibers, respectively. The optical fiber docking assembly is sealed and installed in the air-filled chamber of the T-tube. The air connector is connected to the air-filled chamber and the sealed chamber, respectively.

[0012] Furthermore, the optical fiber docking assembly includes a first connector, a second connector, and a sleeve. The first connector and the second connector are connected through the sleeve. The first connector can connect to the hollow optical fiber, and the second connector can connect to the solid optical fiber.

[0013] Furthermore, the sleeve has a slit that can communicate with the inflation chamber and the first connector, respectively.

[0014] Furthermore, the bubbler has an inlet end and an outlet end that are connected to each other. The inlet end can be used to introduce purge gas, and the outlet end is immersed in the liquid water.

[0015] Furthermore, the sealed cavity has a steam outlet, which is connected to the gas connector.

[0016] Furthermore, the pumping assembly includes a vacuum pump and a second gas chamber assembly. The structure of the second gas chamber assembly is the same as that of the first gas chamber assembly, and the gas connector of the second gas chamber assembly is connected to the vacuum pump.

[0017] Based on the above, a second objective of the present invention is to provide a method for reducing water peak absorption loss in hollow-core optical fibers, so as to at least solve one of the above-mentioned problems.

[0018] To achieve the above objectives, the present invention adopts the following technical solution:

[0019] A method for reducing water peak absorption loss in hollow optical fibers using the heavy water vapor replacement device described in any of the above schemes includes the following steps:

[0020] The gas remaining inside the core of the hollow optical fiber is extracted using an air extraction assembly.

[0021] The purging gas is introduced into the liquid heavy water through a bubbler, and heavy water vapor is formed in the closed cavity.

[0022] Heavy water vapor enters the air-filling chamber of the T-tube through the air connector, and then enters the optical fiber docking assembly and the hollow optical fiber from the air-filling chamber, so as to fill the core of the hollow optical fiber with heavy water vapor.

[0023] Furthermore, the pressure of the heavy water vapor filling the hollow optical fiber is greater than 5 bar.

[0024] Furthermore, the purging gas is an inert gas or nitrogen.

[0025] Based on the above, a third objective of the present invention is to provide a spectral measurement system that at least solves one of the aforementioned problems.

[0026] To achieve the above objectives, the present invention adopts the following technical solution:

[0027] A spectral measurement system for verifying the effectiveness of the method for reducing water peak absorption loss in hollow-core optical fibers according to any of the above schemes, comprising:

[0028] Fiber optic coupler;

[0029] Two sets of heavy water vapor replacement devices, with their first gas chamber components corresponding to liquid heavy water and liquid ordinary water, respectively;

[0030] A broadband light source is connected to two sets of heavy water vapor replacement devices via fiber optic couplers.

[0031] The spectrometer is connected to the extraction components in two sets of heavy water vapor replacement devices.

[0032] The beneficial effects of this invention are as follows:

[0033] This invention provides a heavy water vapor replacement device, comprising a vapor generation component, a first gas chamber component, and a vacuum component. The vacuum component can extract the gas remaining inside the core of a hollow optical fiber. The vapor generation component includes a liquid storage container and a bubbler. The sealed cavity of the liquid storage container stores liquid water, which can be ordinary liquid water or heavy liquid water. The bubbler can introduce purge gas into the liquid water. The first gas chamber component includes an optical fiber docking component, a gas connector, and a T-tube. The two opposite ends of the optical fiber docking component can respectively connect to a hollow optical fiber and a solid optical fiber. The optical fiber docking component is sealed and installed in the inflation cavity of the T-tube. The gas connector is connected to both the inflation cavity and the sealed cavity. The heavy water vapor replacement device can replace the gas retained in the core of hollow optical fiber with heavy water vapor generated by the vapor generation component, changing the atomic composition of gas molecules and hydroxyl groups on the glass wall within the core. The absorption peak of heavy water molecules red-shifts to a longer wavelength, and the absorption intensity is significantly reduced. The heavy water hydroxyl groups are adsorbed on the glass wall surface of the hollow optical fiber, acting as passivators, reducing the secondary adsorption of ordinary water hydroxyl groups and ordinary water vapor during the use of the hollow optical fiber, reducing the water peak absorption loss of the hollow optical fiber, and improving the transmission performance of the hollow optical fiber. It eliminates the need for hydroxyl removal treatment during the glass raw material preparation stage of the hollow optical fiber, and does not require modification of the glass raw material, making it economical and practical.

[0034] This invention provides a method for reducing water peak absorption loss in hollow-core optical fibers, achieved using the aforementioned heavy water vapor replacement device, comprising the following steps:

[0035] The gas remaining inside the core of the hollow optical fiber is extracted using an air extraction assembly.

[0036] The purging gas is introduced into the liquid heavy water through a bubbler, and heavy water vapor is formed in the closed cavity.

[0037] Heavy water vapor enters the air-filling chamber of the T-tube through the air connector, and then enters the optical fiber docking assembly and the hollow optical fiber from the air-filling chamber, so as to fill the core of the hollow optical fiber with heavy water vapor.

[0038] The vacuum pump first evacuates the fiber core to prevent heavy water vapor from mixing with the gas remaining in the fiber core, thus ensuring a more thorough replacement. This ensures that the heavy water vapor completely fills the core of the hollow fiber, reducing absorption peaks and significantly reducing interference with S-band communication. The hydroxyl groups formed by heavy water molecules have stable chemical properties, effectively delaying the secondary adsorption of ordinary water vapor and improving the transmission performance of the optical fiber.

[0039] This invention provides a spectral measurement system, including an optical fiber coupler, two sets of heavy water vapor replacement devices, a broadband light source, and a spectrometer. The first gas chamber components of the two sets of heavy water vapor replacement devices correspond to liquid heavy water and liquid ordinary water, respectively. The broadband light source is connected to the two sets of heavy water vapor replacement devices via the optical fiber coupler, and the spectrometer is connected to the pumping components in the two sets of heavy water vapor replacement devices. By measuring the transmission spectra of the two hollow-core optical fibers, the influence of heavy water vapor and ordinary water vapor on water peak absorption is directly compared to verify the effectiveness of the method for reducing water peak absorption loss in hollow-core optical fibers. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0041] Figure 1 This is a schematic diagram of the loss classification of hollow optical fibers and the replacement principle of the method for reducing water peak absorption loss of hollow optical fibers provided in the specific embodiments of the present invention.

[0042] Figure 2 This is a schematic diagram of the heavy water vapor replacement device provided in a specific embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the first gas chamber assembly provided in a specific embodiment of the present invention;

[0044] Figure 4 This is an exploded view of the first gas chamber assembly provided in a specific embodiment of the present invention;

[0045] Figure 5This is a schematic diagram of the structure of the spectral measurement system provided in a specific embodiment of the present invention;

[0046] Figure 6 These are absorption spectra of liquid heavy water and liquid ordinary water in the 1200nm-2600nm range.

[0047] In the picture:

[0048] 100. Heavy water vapor replacement device; 200. Hollow-core optical fiber; 300. Broadband light source; 400. Fiber optic coupler; 401. Single-pin; 402. Two-pin; 500. Spectrometer; 600. Solid-core optical fiber;

[0049] 1. Steam generation assembly; 2. First gas chamber assembly; 3. Gas extraction assembly;

[0050] 11. Liquid storage container; 12. Liquid water; 13. Bubble blower; 14. Steam generation pipe; 21. Fiber optic connector assembly; 22. Gas connector; 23. T-tube; 31. Vacuum pump; 32. Second gas chamber assembly; 33. Vacuum extraction pipe;

[0051] 111. Sealed cavity; 112. Steam outlet; 121. Liquid heavy water; 122. Liquid ordinary water; 131. Air inlet end; 132. Air outlet end; 211. First connector; 212. Second connector; 213. Sleeve; 231. Air filling cavity;

[0052] 2111, insert; 2112, handle; 2131, gap. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the drawings, not the entire structure.

[0054] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0057] like Figures 1-4 As shown, this embodiment provides a heavy water vapor replacement device 100, which is used to replace the gas remaining in the core of the hollow optical fiber 200 with heavy water vapor, so as to improve the transmission performance of the hollow optical fiber 200.

[0058] like Figure 1 As shown, the losses in hollow optical fibers include leakage loss, absorption loss, and scattering loss. Absorption loss includes material absorption loss and gas absorption loss. Material absorption loss includes transition metal ion absorption loss and hydroxyl ion absorption loss of the glass material. Gas absorption loss includes water vapor absorption loss and other gas absorption losses. The heavy water vapor replacement device 100 provided in this embodiment replaces the gas remaining in the core of the hollow optical fiber 200 with heavy water vapor. Utilizing the characteristic that the isotope of hydrogen atom (H)—deuterium (D)—has the same chemical properties, heavy water (DO) vapor is introduced into the hollow optical fiber, replacing the ordinary water vapor in the core of the hollow optical fiber. The absorption peak of heavy water molecules red-shifts to a longer wavelength, significantly reducing water peak absorption, thereby reducing water vapor absorption loss. At the same time, hydroxyl ions on the glass wall surface forming the core are replaced with heavy water hydroxyl ions. The treated hollow optical fiber exhibits a certain degree of passivation effect on water vapor in the application environment, delaying the impact of water vapor re-adsorption on optical fiber performance, thereby reducing hydroxyl ion absorption loss of the glass material.

[0059] The heavy water vapor replacement device 100 includes a vapor generation component 1, a first gas chamber component 2, and a vacuum component 3. The vacuum component 3 can extract the gas remaining in the core of the hollow optical fiber 200. The vapor generation component 1 includes a liquid storage container 11 and a bubbler 13. The sealed cavity 111 of the liquid storage container 11 stores liquid water 12, which can be ordinary liquid water 122 or heavy liquid water 121. The bubbler 13 can introduce purging gas into the liquid water 12. The first gas chamber component 2 includes an optical fiber docking component 21, a gas connector 22, and a T-tube 23. The two opposite ends of the optical fiber docking component 21 can be connected to the hollow optical fiber 200 and the solid optical fiber 600, respectively. The optical fiber docking component 21 is sealed and installed in the inflation cavity 231 of the T-tube 23. The gas connector 22 is connected to the inflation cavity 231 and the sealed cavity 111, respectively. The heavy water vapor replacement device 100 can replace the gas retained in the core of the hollow optical fiber 200 with heavy water vapor generated by the vapor generation component 1, changing the atomic composition of gas molecules and hydroxyl groups on the glass wall within the core. The absorption peak of heavy water molecules red-shifts to a longer wavelength, and the absorption intensity is significantly reduced. The heavy water hydroxyl groups are adsorbed on the glass wall surface of the hollow optical fiber 200, which acts as a passivation agent, reducing the secondary adsorption of ordinary water hydroxyl groups and ordinary water vapor during the use of the hollow optical fiber 200, reducing the water peak absorption loss of the hollow optical fiber 200, and improving the transmission performance of the hollow optical fiber 200. It eliminates the need for hydroxyl removal treatment during the glass raw material preparation stage of the hollow optical fiber 200, and does not require changing the glass raw material, making it economical and practical.

[0060] like Figure 2 As shown, the bubbler 13 has an inlet end 131 and an outlet end 132 connected together. The inlet end 131 can be filled with purging gas, and the outlet end 132 is immersed in liquid water 12.

[0061] Furthermore, the steam generation assembly 1 also includes a gas cylinder containing purge gas. The gas cylinder is connected to the air inlet 131 so that the purge gas can be introduced into the bubbler 13 to facilitate the generation of replacement water vapor.

[0062] Specifically, the purging gas can be nitrogen or an inert gas, which will not affect the gas replacement inside the fiber core, thus ensuring the transmission performance of the hollow fiber 200.

[0063] Furthermore, after the bubbler 13 is installed on the liquid storage container 11, the upper end of the liquid storage container 11 can be sealed by a lid or the like to form a closed cavity 111, so that the generated displacement water vapor can be smoothly filled into the first gas chamber assembly 2.

[0064] Specifically, the air inlet end 131 of the bubbler 13 is located outside the sealed cavity 111 of the liquid storage container 11 so that the air inlet end 131 can be connected to the gas cylinder.

[0065] Furthermore, the sealed cavity 111 has a steam outlet 112, which is located above the liquid surface of the liquid water 12 stored in the sealed cavity 111. The steam outlet 112 is connected to the gas connector 22 so that the generated displacement water vapor can be filled into the gas connector 22.

[0066] When the liquid water 12 is liquid heavy water 121, the displacement water vapor generated by the steam generation component 1 is heavy water vapor; when the liquid water 12 is liquid ordinary water 122, the displacement water vapor generated by the steam generation component 1 is ordinary water vapor.

[0067] Furthermore, the steam generation assembly 1 also includes a steam generation pipe 14, through which the steam generation port 112 and the gas connector 22 are connected. The steam generation pipe 14 needs to be dehumidified beforehand to prevent water vapor in the steam generation pipe 14 from interfering with the replacement result.

[0068] Furthermore, the vacuum pump assembly 3 includes a vacuum pump 31 and a second gas chamber assembly 32. The structure of the second gas chamber assembly 32 is the same as that of the first gas chamber assembly 2, and the gas connector of the second gas chamber assembly 32 is connected to the vacuum pump 31. The vacuum pump assembly 3 is configured to evacuate the fiber core, preventing the heavy water vapor from mixing with the gas remaining in the fiber core, thereby ensuring a more thorough replacement, that is, ensuring that the heavy water vapor completely fills the fiber core of the hollow optical fiber 200.

[0069] Furthermore, the extraction assembly 3 also includes an extraction pipe 33, and the gas connector 22 of the second gas chamber assembly 32 is connected to the vacuum pump 31 through the extraction pipe 33. The extraction pipe 33 needs to be dehumidified beforehand to prevent water vapor in the extraction pipe 33 from interfering with the replacement result.

[0070] like Figure 3 and Figure 4 As shown, the fiber optic connector 21 includes a first connector 211, a second connector 212, and a sleeve 213. The first connector 211 and the second connector 212 are connected through the sleeve 213. The first connector 211 can connect to a hollow fiber 200, and the second connector 212 can connect to a solid fiber 600.

[0071] Specifically, the first connector 211 and the second connector 212 are sealed in the air-filling cavity 231 of the T-shaped tube 23 with UV adhesive to prevent heavy water vapor from flowing out of the air-filling cavity 231, so as to fill the core of the hollow optical fiber 200 with heavy water vapor.

[0072] Furthermore, the sleeve 213 has a slit 2131, which can communicate with the inflation chamber 231 and the first connector 211 respectively. This arrangement ensures that heavy water vapor enters the slit 2131 from the inflation chamber 231, then enters the first connector 211, and subsequently enters the core of the hollow optical fiber 200, so that the core of the hollow optical fiber 200 is filled with heavy water vapor.

[0073] Furthermore, both the first connector 211 and the second connector 212 may have gaps, which also facilitates the entry of heavy water vapor into the core of the hollow optical fiber 200, making it easier to complete the replacement process.

[0074] Specifically, the width of the slit 2131 of the sleeve 213 is less than 1 mm, the width of the slit of the first connector 211 is within 100 micrometers, and the width of the slit of the second connector 212 is within 100 micrometers.

[0075] Furthermore, the second connector 212 is located in the TEC mode field, which facilitates coupling with the hollow fiber 200.

[0076] Furthermore, the spacing between the TEC mode field where the second connector 212 is located and the hollow fiber 200 is within 100 micrometers, which ensures the coupling efficiency between the TEC mode field and the hollow fiber 200 while also facilitating air filling.

[0077] Furthermore, the first connector 211 includes a ferrule 2111 and a ferrule 2112. The ferrule 2111 is fixedly installed on the ferrule 2112. The ferrule 2111 is connected to the sleeve 213. The hollow optical fiber 200 is inserted into the ferrule 2112 and then into the ferrule 2111.

[0078] Specifically, after the hollow fiber 200 is inserted into the ferrule 2111, the hollow fiber 200 is fixed in the ferrule 2112 with UV adhesive.

[0079] In this embodiment, the structure of the second connector 212 is similar to that of the first connector 211. The only difference is that the solid optical fiber 600 passes through the ferrule 2112 of the second connector 212 and is inserted into the ferrule 2111 of the second connector 212.

[0080] In this embodiment, the two opposite ends of the sleeve 213 are fixedly connected to the insert 2111 of the first connector 211 and the insert 2111 of the second connector 212, respectively.

[0081] Specifically, the sleeve 213 and the insert 2111 of the first connector 211, as well as the sleeve 213 and the insert 2111 of the second connector 212, are fixedly connected by UV adhesive to prevent the docking coupling vibration caused by excessive air pressure during the evacuation process, prevent additional insertion loss, and ensure the accuracy of the replacement results.

[0082] In this embodiment, the structure of the second gas chamber assembly 32 is the same as that of the first gas chamber assembly 2. The first connector of the second gas chamber assembly 32 is connected to the hollow optical fiber 200, the second connector of the second gas chamber assembly 32 is connected to the solid optical fiber 600, and the gas connector of the second gas chamber assembly 32 is connected to the vacuum pump 31. The specific structure will not be described in detail here.

[0083] Furthermore, the air connector 22 and the T-shaped pipe 23 can be connected by threads, making them plug-and-play and more convenient and quick to use.

[0084] Furthermore, the first gas chamber assembly 2 and the second gas chamber assembly 32 are dehumidified as a whole to prevent the gas in the first gas chamber assembly 2 and the second gas chamber assembly 32 from affecting the replacement result and to ensure a more thorough replacement.

[0085] The heavy water vapor replacement device 100 is applicable to all hollow optical fibers 200, including anti-resonant hollow optical fibers, photonic crystal bandgap hollow optical fibers, etc., and this embodiment does not limit it.

[0086] In practical applications, the core of the hollow optical fiber 200 is filled with heavy water vapor using the heavy water vapor replacement device 100, forming a passivation-like film that adheres to the glass wall of the core. Then, the end face of the hollow optical fiber 200 is sealed to prevent the core of the hollow optical fiber 200 from contacting the environment and to avoid secondary adsorption of environmental moisture.

[0087] This embodiment also provides a method for reducing water peak absorption loss in hollow-core optical fibers, which is achieved using the aforementioned heavy water vapor replacement device 100, and includes the following steps:

[0088] The gas remaining in the core of the hollow optical fiber 200 is extracted using the air extraction component 3.

[0089] The purging gas is introduced into the liquid heavy water 121 through the bubbler 13, and heavy water vapor is formed in the sealed cavity 111.

[0090] Heavy water vapor enters the inflation chamber 231 of the T-tube 23 through the air connector 22, and then enters the optical fiber docking assembly 21 and the hollow optical fiber 200 from the inflation chamber 231, so as to fill the core of the hollow optical fiber 200 with heavy water vapor.

[0091] The vacuum pump 3 first evacuates the fiber core to prevent the heavy water vapor from mixing with the gas remaining in the fiber core, thus ensuring a more thorough replacement. This ensures that the heavy water vapor completely fills the core of the hollow fiber 200, reducing absorption peaks and significantly reducing interference in S-band communication. The hydroxyl groups formed by heavy water molecules have stable chemical properties, effectively delaying the secondary adsorption of ordinary water vapor and improving the transmission performance of the optical fiber.

[0092] The step of introducing purge gas into liquid heavy water 121 through bubbler 13 and forming heavy water vapor in sealed cavity 111 includes the following specific steps:

[0093] The purge gas in the gas cylinder enters the bubbler 13 through the inlet 131. The purge gas is then discharged from the outlet 132 of the bubbler 13, and then mixes and dissolves with the liquid heavy water 121, forming heavy water vapor above the surface of the liquid heavy water 121.

[0094] Furthermore, the pressure of heavy water vapor filling the hollow optical fiber 200 is greater than 5 bar, which can increase the rate at which heavy water vapor replaces ordinary water vapor.

[0095] like Figure 5 As shown, this embodiment also provides a spectral measurement system, including an optical fiber coupler 400, two sets of heavy water vapor replacement devices 100, a broadband light source 300, and a spectrometer 500. The first gas chamber components 2 of the two sets of heavy water vapor replacement devices 100 correspond to liquid heavy water 121 and liquid ordinary water 122, respectively. The broadband light source 300 is connected to the two sets of heavy water vapor replacement devices 100 through the optical fiber coupler 400, and the spectrometer 500 is connected to the pumping components 3 in the two sets of heavy water vapor replacement devices 100. By measuring the transmission spectra of the two hollow optical fibers 200, the effects of liquid heavy water vapor 121 and liquid ordinary water vapor 122 on water peak absorption are directly compared to verify the effectiveness of the method for reducing water peak absorption loss in hollow optical fibers.

[0096] Furthermore, the fiber optic coupler 400 has a single pin 401 and a double pin 402. The single pin 401 is fused to the broadband light source 300, and the two pins of the double pin 402 are connected to the second connector 212 in the two sets of heavy water vapor replacement devices 100 through solid optical fibers 600.

[0097] Specifically, the two pins of the dual-pin 402 are fused to two solid-core optical fibers 600 respectively.

[0098] Furthermore, the spectrometer 500 is connected to the extraction components 3 in the two sets of heavy water vapor replacement devices 100 via solid optical fibers 600.

[0099] In this embodiment, the welding loss is less than 0.01dB, which is negligible.

[0100] In this embodiment, the solid fiber 600 can be a single-mode solid fiber SMF-28.

[0101] The broadband light source 300 is connected to the second connector 212 via a single-mode patch cord, and then coupled into the hollow fiber 200. Because the mode field of the second connector 212 is similar in size to that of the hollow fiber 200, the coupling efficiency is high, reducing losses.

[0102] Solid fiber 600 was chosen to connect the heavy water vapor replacement device 100 to the fiber optic coupler 400 and the heavy water vapor replacement device 100 to the spectrometer 500. This is to ensure that the coupling conditions of the spectrometer 500 remain unchanged and to guarantee the accuracy of the verification results.

[0103] Within the same time period, ordinary water vapor and heavy water vapor of the same flow rate were injected into two hollow optical fibers of equal length 200 to ensure the consistency of experimental conditions.

[0104] The final output spectrum obtained by the spectral measurement system is as follows: Figure 6 As shown, the substitution process of phonon absorption of the same order will cause the absorption peak to redshift. At the same time, the absorption of the third-order phonon of the short wave will redshift to the vicinity of this position, but the absorption intensity is one order of magnitude smaller, that is, the absorption intensity is significantly reduced compared with ordinary water. The absorption spectrum of liquid heavy water 121 is broadened, which has a passivating effect on the glass wall inside the core of hollow fiber 200, delays the secondary adsorption of water vapor in the environment, and improves the transmission performance of hollow fiber 200.

[0105] In this embodiment, the absorption peak of ordinary water vapor at 1470 nm is red-shifted to around 2000 nm to form a heavy water absorption peak, thereby reducing the interference of water vapor absorption on S-band communication. The wavelength of the heavy water absorption peak formed after the red-shift of the absorption peak of ordinary water vapor at 1470 nm is related to the molecular vibration intensity of heavy water vapor. Since heavy water atoms have a larger mass, their vibration intensity is smaller, their frequency is smaller, and their absorption wavelength is longer.

[0106] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A heavy water vapor displacement device, characterized by, The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method.

2. The heavy water water displacement device of claim 1, wherein, The application relates to a kind of heavy water vapor generator and method.

3. The heavy water water displacement device of claim 2, wherein, The application relates to a kind of heavy water vapor generator and method.

4. The heavy water water displacement device of claim 1, wherein, The application relates to a kind of heavy water vapor generator and method.

5. The heavy water water displacement device of claim 1, wherein, The application relates to a kind of heavy water vapor generator and method.

6. The heavy water water displacement device of claim 1, wherein, The application relates to a kind of heavy water vapor generator and method.

7. A method for reducing water peak absorption loss of a hollow core fiber by using the heavy water vapor displacement device according to any one of claims 1-6. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method.

8. The method of claim 7, wherein the step of reducing the water peak absorption loss of the hollow core optical fiber is performed by, The application relates to a kind of heavy water vapor generator and method.

9. The method of claim 7, wherein the step of reducing the water peak absorption loss of the hollow core optical fiber is performed by, The application relates to a kind of heavy water vapor generator and method.

10. A spectral measurement system for verifying the effectiveness of the method of reducing water peak absorption loss in a hollow core fiber as claimed in any one of claims 7-9 implemented using the heavy water vapor displacement device, characterized in that, The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to a kind of heavy water vapor generator and method. The application relates to Two groups of heavy water vapor replacement devices (100), wherein the first gas cavity assembly (2) in one group of the heavy water vapor replacement device (100) corresponds to liquid heavy water (121), and the corresponding liquid heavy water (121) in the first gas cavity assembly (2) in the other group of the heavy water vapor replacement device (100) is replaced by liquid ordinary water (122); A broadband light source (300) is connected with the two groups of heavy water vapor replacement devices (100) through a fiber coupler (400) respectively; A spectrometer (500) is connected with the gas extraction assembly (3) in the two groups of heavy water vapor replacement devices (100) respectively.

Images