CN110865436B - Method and device for directly coupling hollow photonic band gap optical fiber ring and integrated optical chip based on composite light guide mechanism - Google Patents
Method and device for directly coupling hollow photonic band gap optical fiber ring and integrated optical chip based on composite light guide mechanism Download PDFInfo
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
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Abstract
The invention provides a method and a device for directly coupling a hollow photonic band gap fiber ring and an integrated optical chip based on a composite light guide mechanism, aiming at the problem of coupling the hollow photonic band gap fiber ring which restricts the performance of a hollow photonic band gap fiber gyroscope, and belongs to the technical field of manufacturing of optical fiber devices. The device comprises: the optical fiber comprises a hollow photonic band gap optical fiber ring with a composite light guide mechanism, a clamp and an integrated optical chip. The method comprises the following steps: step 1, obtaining a flat end face of a hollow photonic band gap optical fiber ring; step 2, injecting high-refractive-index and low-refractive-index optical cement into the large fiber core air hole and the small cladding air hole on the end face respectively; and 3, directly coupling the hollow photonic band gap optical fiber ring with the composite light guide mechanism with the integrated optical chip. The invention does not need welding, eliminates the influence of a welding point on the reciprocity of optical paths, and realizes the direct coupling of the hollow photonic band gap optical fiber ring and the integrated optical chip with low loss, low back reflection and high reliability by selecting and filling proper high-low refractive index optical cement.
Description
Technical Field
The invention belongs to the technical field of optical fiber device manufacturing, and particularly relates to a method and a device for directly coupling a hollow photonic band gap optical fiber ring and an integrated optical chip based on a composite light guide mechanism.
Background
The hollow photonic band gap fiber realizes light guiding based on the photonic band gap effect, the cladding of the hollow photonic band gap fiber is a glass tube which is periodically arranged, a two-dimensional photonic crystal with high refractive index and low refractive index which are periodically distributed is formed, a photonic band gap is generated, and light with the frequency within the photonic band gap cannot be transmitted in the cladding, so that the light cannot be transmitted in the cladding. The large air hole of the fiber core causes the two-dimensional photonic crystal to generate defects, the photonic band gap generates a defect state with extremely narrow frequency, the light energy with the specific frequency is transmitted in the fiber core, but the light is limited in the large air hole of the fiber core because the photonic band gap cannot be transmitted in the cladding, and the light guiding is realized. Compared with the traditional quartz optical fiber, the hollow photonic band gap optical fiber has the advantages of greatly reducing the influence of environmental factors on the optical fiber transmission performance by transmitting more than 95% of light in the air when guiding light, having low bending loss, low nonlinearity, radiation resistance, low magnetic sensitivity, low temperature sensitivity and the like, and can greatly improve the optical fiber gyroscope performance by replacing the traditional optical fiber in the optical fiber gyroscope. Therefore, the hollow photonic band gap fiber is an ideal choice for realizing a high-precision fiber-optic gyroscope and a deep space detection fiber-optic gyroscope.
The integrated optical chip and the optical fiber ring in the optical fiber gyroscope structure are connected to form a closed loop, and the rotating speed information based on the Sagnac effect sensitive system is a core component of the optical fiber gyroscope, so that for the hollow photonic band gap optical fiber gyroscope, the coupling quality of the hollow photonic band gap optical fiber ring and the integrated optical chip has important influence on the performance of the gyroscope. The integrated optical chip is an integrated optical waveguide device integrating functions of light splitting, modulation, polarization and the like, the existing hollow photonic band gap optical fiber ring and the integrated optical chip are mainly connected by a pigtail fusion welding method and are divided into a flat cutting fusion welding mode and a beveling fusion welding mode, and due to the porous structure of the hollow photonic band gap optical fiber, the fusion welding quality of a fusion welding point is extremely unreliable, and the strength is extremely low. And the refractive index at the welding point is suddenly changed to generate strong back reflection, and the back reflection light interferes with the main beam to influence the phase of the main beam. Compared with the flat cutting welding, the back reflection is reduced to a certain extent by the inclined cutting welding, but the welding difficulty is higher, and the quality of a welding point is more difficult to ensure. In addition, the high temperature generated in the fusion process can cause the collapse of air holes of the hollow-core photonic band-gap fiber near the fusion point, and generate larger coupling loss. In a word, the problems of strong backward reflection and mode field mismatch of the fusion connection mode of the hollow photonic band gap fiber ring and the tail fiber of the integrated optical chip are difficult to solve, so that the loss is large, high-efficiency light transmission cannot be realized, and the reciprocity and symmetry of a light path can be damaged by the tiny nonreciprocal phase shift generated by the tail fiber fusion point, so that the gyro precision is greatly influenced, and the development of the hollow photonic band gap fiber gyro is seriously hindered.
At present, the research on the direct coupling of the hollow-core photonic band-gap fiber ring and the integrated optical chip is almost blank, and the development of a high-performance hollow-core photonic band-gap fiber gyroscope is restricted.
Disclosure of Invention
The invention provides a method and a device for directly coupling a hollow photonic band gap optical fiber ring and an integrated optical chip based on a composite light guide mechanism, aiming at the problems that the loss is large, the back reflection is strong, the reciprocity and the symmetry of a light path can be damaged by tiny nonreciprocal phase shift generated by a welding point, the gyro precision is greatly influenced, and the development of a hollow photonic band gap optical fiber gyro is seriously hindered in the conventional welding mode of the hollow photonic band gap optical fiber ring and the tail fiber of the integrated optical chip.
The invention relates to a hollow photonic band gap optical fiber ring and integrated optical chip direct coupling device based on a composite light guide mechanism, which comprises: the optical fiber comprises a hollow photonic band gap optical fiber ring with a composite light guide mechanism, a clamp and an integrated optical chip. The hollow photonic band gap fiber ring converts a light guiding mechanism of a fiber segment at one end coupled with a light outlet of the integrated optical chip into total internal reflection by injecting optical cement, and a fiber mode field is matched with a waveguide mode field on the integrated optical chip to the maximum extent. The end face of the integrated optical chip adopts a beveling mode, the end face of the hollow photonic band-gap optical fiber ring is fixed to a light outlet of the integrated optical chip through a clamp, and the end face of the hollow photonic band-gap optical fiber is directly coupled with a waveguide on the integrated optical chip.
The manufacturing method of the hollow photonic band gap optical fiber ring with the composite light guide mechanism comprises the following steps: injecting high-refractive-index optical cement into a large core air hole of a hollow photonic band-gap fiber section, and injecting low-refractive-index optical cement into a small cladding air hole of the hollow photonic band-gap fiber section, so that the core refractive index of the hollow photonic band-gap fiber of the glue injection part is greater than the cladding refractive index, the light guide mechanism is converted into total internal reflection, and the light guide mechanism and the non-glue injection hollow photonic band-gap fiber form a hollow photonic band-gap fiber ring of a composite light guide mechanism.
The invention relates to a method for directly coupling a hollow photonic band gap optical fiber ring based on a composite light guide mechanism with an integrated optical chip, which comprises the following steps:
injecting high-refractive-index optical cement into a large core air hole on the end face of the hollow photonic band-gap optical fiber ring, injecting low-refractive-index optical cement into a small cladding air hole on the end face of the hollow photonic band-gap optical fiber ring, finally, injecting glue, wherein the core refractive index of the hollow photonic band-gap optical fiber is larger than the cladding refractive index, a light guide mechanism is converted into total internal reflection, the light guide mechanism of the hollow photonic band-gap optical fiber without glue injection is still the photonic band-gap effect, and the hollow photonic band-gap optical fiber ring of the composite light guide;
beveling the end face of the integrated optical chip; establishing a model for direct coupling of the hollow photonic band gap fiber and the waveguide on the integrated optical chip through simulation software, simulating different coupling angles, calculating direct coupling efficiency, and obtaining an optimal coupling angle under the maximum coupling efficiency; under the condition of maximum coupling efficiency, grinding the coupling end face of the hollow-core photonic band-gap fiber according to the optimal coupling angle; the end face of the ground hollow photonic band gap fiber ring is fixed to a light outlet of the integrated optical chip through a clamp, so that direct coupling is realized.
Compared with the prior art, the invention has the following advantages and positive effects:
(1) the invention realizes the low-loss high-efficiency direct coupling of the hollow photonic band gap optical fiber ring and the integrated optical chip. The invention does not need to weld the hollow photonic band gap optical fiber ring and the chip tail fiber, thereby eliminating the extra high loss caused by welding points. The mode field diameter of the hollow photonic band gap fiber at the glue injection part can be effectively changed by reasonably selecting the optical glue with high and low refractive indexes, so that the mode field of the hollow photonic band gap fiber is matched with the mode field of the integrated optical chip to the maximum extent, and high-efficiency coupling is realized.
(2) The invention realizes the low back reflection direct coupling of the hollow photonic band gap optical fiber ring and the integrated optical chip. The invention removes the welding point of the hollow photonic band gap optical fiber ring and the tail fiber and eliminates the extra high back reflection brought by the welding point.
(3) The invention realizes the high-reliability coupling of the hollow photonic band gap optical fiber ring and the integrated optical chip. The invention has no welding operation, eliminates the unreliability of welding points and eliminates the influence of the welding points on the reciprocity and symmetry of an optical path. The hollow photonic band gap fiber ring subjected to glue injection treatment is directly in butt coupling with the integrated optical chip, and the butt joint point is reliable in quality and high in strength. In addition, the glue injection on the end face of the hollow photonic band gap optical fiber ring has the function of sealing air holes of the optical fiber, so that the influence of air components in the environment on the optical performance of the hollow photonic band gap optical fiber can be effectively reduced, and the environmental adaptability is greatly improved.
(4) The direct coupling method of the hollow photonic band gap optical fiber ring and the integrated optical chip has universality. By selecting and filling proper high-low refractive index optical cement, the direct coupling of different hollow-core photonic band gap optical fiber rings and the integrated optical chip can be realized.
Drawings
FIG. 1 is a schematic structural diagram of an end face of a hollow core photonic band gap fiber used in the present invention;
FIG. 2 is an axial cross-sectional view of the hollow-core photonic band-gap fiber of FIG. 1 after glue injection;
FIG. 3 is a perspective view of the three-dimensional structure of the hollow-core photonic band-gap fiber after glue injection;
FIG. 4 is a schematic diagram of the present invention for determining an optimal coupling angle when directly coupling a hollow-core photonic band-gap fiber ring to an integrated optical chip;
FIG. 5 is a schematic diagram of a process of directly coupling a hollow-core photonic band-gap fiber ring and an integrated optical chip based on a composite light guide mechanism according to the present invention;
FIG. 6 is a schematic structural diagram of a direct coupling device of a hollow-core photonic band-gap fiber ring and an integrated optical chip of the composite light guide mechanism of the present invention;
fig. 7 is a schematic flow chart of a method for directly coupling a hollow-core photonic band-gap fiber ring and an integrated optical chip based on a composite light guide mechanism according to the present invention.
In the figure:
1-large air holes of fiber core; 2-cladding small air holes; 3-a cladding quartz layer; 4-high refractive index optical cement; 5-low refractive index optical cement; 6-glue injection a area hollow photonic band gap fiber; 7-glue injection b area hollow photonic band gap fiber; 8-hollow photonic band gap fiber without glue injection; 9-hollow photonic band gap fiber ring clamp; 10-integrated optical chip upper surface waveguide; 11-an integrated optical chip; 12-hollow core photonic band gap fiber ring.
Detailed Description
The present invention will be described in further detail and with reference to the accompanying drawings so that those skilled in the art can understand and practice the invention.
Firstly, the device for directly coupling the hollow-core photonic band-gap optical fiber ring based on the composite light guide mechanism and the integrated optical chip is described.
As shown in fig. 1, the end face structure of the hollow-core photonic band gap fiber used in the present invention includes a core large air hole 1, a cladding small air hole 2, and a cladding quartz layer 3.
As shown in FIG. 2, the invention injects high refractive index optical cement 4 into the large core air hole 1 of the end face of the hollow photonic band gap fiber, and injects low refractive index optical cement 5 into the small cladding air hole 2. The hollow-core photonic band-gap fiber is axially marked as a hollow-core photonic band-gap fiber 6 in a glue injection a area, the part where the high-refractive-index optical glue 4 and the low-refractive-index optical glue 5 exist simultaneously is marked as a hollow-core photonic band-gap fiber 7 in a glue injection b area, and the part where the high-refractive-index optical glue 4 and the low-refractive-index optical glue 5 do not exist is marked as a hollow-core photonic band-gap fiber 8 without glue injection. The three-dimensional structure of the hollow-core photonic band gap fiber after glue injection is shown in figure 3. The light guiding mechanism of the hollow-core photonic band gap fiber 6 in the glue injection area a and the hollow-core photonic band gap fiber 7 in the glue injection area b is total internal reflection, so that the whole hollow-core photonic band gap fiber ring has a composite light guiding mechanism of total internal reflection and photonic band gap effect.
As shown in fig. 4, in the invention, the hollow-core photonic band-gap fiber after glue injection needs to be directly coupled with the integrated optical chip, and at this time, an optimal coupling angle needs to be determined, a direct coupling model of the end face of the integrated optical chip 11 and the hollow-core photonic band-gap fiber 6 in the glue injection a region is established through simulation software, and the optimal coupling angle is selected by simulating the direct coupling efficiency at different coupling angles θ.
As shown in fig. 5, the direct coupling device of the present invention designs a hollow photonic band gap fiber ring clamp 9, and fixes the hollow photonic band gap fibers 6 and 7 in the glue injection region a and region b on the hollow photonic band gap fiber ring clamp 9, and then forms an optical fiber assembly together and fixes the optical fiber assembly on the multidimensional displacement table. After the optimal coupling angle is determined, the end face of the hollow-core photonic band-gap fiber 6 in the glue injection area a is ground according to the optimal coupling angle, and then the multidimensional displacement table is controlled to carry the fiber assembly to be in butt joint with the end face of the waveguide 10 at the optimal coupling angle. The structure of the direct coupling device of the hollow photonic band gap optical fiber ring and the integrated optical chip of the composite light guide mechanism is shown in fig. 6.
The implementation flow of the method for directly coupling the hollow-core photonic band-gap optical fiber ring based on the composite light guide mechanism and the integrated optical chip is shown in fig. 7, and is described by dividing into 4 steps.
the selection of the high-refractive-index optical cement 4 and the low-refractive-index optical cement 5 needs to meet two conditions, firstly, the mode field of the hollow photonic band-gap fiber 6 in the glue injection area a is matched with the mode field of the waveguide 10 in the integrated optical chip 11 to the greatest extent, and the coupling efficiency is improved; secondly, the light generates the back reflection and the loss as small as possible on the interface of the injected part and the uninjected part. The interface between the glue injection part and the glue non-injection part is the boundary between the hollow-core photonic band-gap fiber 7 in the glue injection b region and the non-glue injection hollow-core photonic band-gap fiber 8 in fig. 2. Before glue injection, the optical glue meeting the two conditions needs to be selected according to theoretical calculation and experimental simulation results.
And 2, cutting the tail end of the hollow photonic band gap fiber ring, and removing fiber scraps and dust in an air hole of the end face to obtain a smooth end face of the optical fiber, as shown in figure 1, so as to prepare for glue injection.
And 3, injecting high-refractive-index optical cement 4 into the large core air hole 1 and injecting low-refractive-index optical cement 5 into the small cladding air hole 2 respectively.
According to the capillary phenomenon effect, high-refractive-index optical cement 4 is injected into the large air hole 1 of the fiber core of the optical fiber, so that the large air hole 1 of the fiber core of the hollow photonic band-gap fiber close to a section of length of the end face is filled with the high-refractive-index optical cement 4. When the high-refractive-index optical cement 4 is injected into the large core air hole 1, a part of the high-refractive-index optical cement 4 enters the small cladding air hole 2, and the small cladding air hole 2 is polluted. The diameters of the large core air hole 1 and the small cladding air hole 2 are both micron-sized, and the rising rate of liquid in the capillary phenomenon is in direct proportion to the square of the diameter of the air hole, so that the filling rate of the high-refractive-index optical cement 4 in the large core air hole 1 is high, the filling length of the high-refractive-index optical cement 4 in the large core air hole 1 is longer than that of the small cladding air hole 2 within a certain time, the hollow photonic band gap fiber filled with the high-refractive-index optical cement 4 in the small cladding air hole 2 is cut off, and the fiber filled with the high-refractive-index optical cement 4 in the large core air hole 1 is left. Cleaning the end face again, injecting low-refractive-index optical cement 5 into the cladding small air hole 2, wherein the core large air hole 1 is filled with the solidified high-refractive-index optical cement 4, so that the low-refractive-index optical cement 5 cannot enter the core large air hole 1, and the three-dimensional perspective structure of the hollow photonic band-gap optical fiber after glue injection is shown in fig. 3.
As shown in fig. 2, it is an axial cross section of the hollow-core photonic band gap fiber after glue injection. The large core air hole 1 and the small cladding air hole 2 of the hollow photonic band-gap fiber 6 in the glue injection a region are filled with high-refractive-index optical cement 4 and low-refractive-index optical cement 5 respectively, the refractive index of the core is larger than that of the cladding, the total internal reflection condition is met, and due to reasonable selection of the high-refractive-index optical cement 4 and the low-refractive-index optical cement 5, the mode field of the fiber in the region is matched with the mode field of the waveguide 10 on the integrated optical chip to the maximum extent. The large air holes 1 of the fiber core of the hollow photonic band-gap fiber 7 in the glue injection b area are filled with high-refractive-index optical glue 4, and the small air holes 2 of the cladding are not filled with glue, so that the total internal reflection condition is still met. The light guiding mechanism of the hollow-core photonic band gap fibers in the two regions is converted into total internal reflection, the hollow-core photonic band gap fiber 8 without glue injection still guides light by the photonic band gap effect, and the whole hollow-core photonic band gap fiber ring has a composite light guiding mechanism of the total internal reflection and the photonic band gap effect.
And 4, directly coupling the hollow photonic band gap optical fiber ring with the integrated optical chip.
In order to reduce back reflection, the end face of the integrated optical chip 11 is chamfered, and when the glue injection a-region hollow-core photonic band gap fiber 6 and the integrated optical chip 11 are directly coupled through the end face, light is refracted on an interface due to the fact that the refractive indexes of the two are different and the incident angle i is larger than 0 degree. As shown in fig. 4, light is refracted at the end face of the waveguide 10 on the integrated optical chip 11, and the angle of the light deviating from the original propagation direction can be calculated according to the law of refraction, so as to preliminarily determine the coupling angle θ of the hollow-core photonic band gap fiber 6 in the glue injection a region.
In order to determine the optimal coupling angle more accurately, the direct coupling model is established by using simulation software, the direct coupling efficiency under different coupling angles theta is simulated, a comparative physical experiment is carried out, and finally, simulation and experiment results are synthesized to obtain the optimal coupling angle of the hollow-core photonic band gap fiber 6 in the glue injection a region and the integrated optical chip 11 when the direct coupling efficiency is maximum.
And in the later direct coupling, the end face of the hollow-core photonic band-gap fiber 6 in the glue injection a area needs to be ground into a determined optimal coupling angle. As shown in fig. 5, a hollow-core photonic band-gap fiber ring clamp 9 is designed, when the direct coupling operation is performed, firstly, the glue-injected a-region hollow-core photonic band-gap fibers 6 and 7 are fixed on the hollow-core photonic band-gap fiber ring clamp 9 to form an optical fiber assembly, the fiber coupling end face of the optical fiber assembly is ground at a predetermined optimal coupling angle, then a multidimensional displacement table is controlled to carry the optical fiber assembly to be in butt joint with the end face of the waveguide 10 at the optimal coupling angle, the end face of the glue-injected a-region hollow-core photonic band-gap fiber 6 and the end face of the light outlet of the waveguide 10 are ensured to be parallel and close to each other as much as possible, after the maximum coupling optical power is achieved through adjustment, the hollow-core photonic band-gap fiber ring clamp 9 is fixed on an integrated optical chip 11 at the current position, and finally.
Compared with a pigtail fusion splicing mode, the direct coupling mode of the hollow photonic band gap fiber ring and the integrated optical chip eliminates two fusion splicing points, eliminates the nonreciprocal and symmetrical influence of the fusion splicing points on an optical path, is easier to realize low loss, low back reflection, high reliability, simple in realization process, can give full play to the advantages of environmental adaptability of the hollow photonic band gap fiber and the like, is more beneficial to the development of high-precision fiber gyroscopes, and lays a foundation for the development of high-precision hollow photonic band gap fiber gyroscopes.
Claims (6)
1. A direct coupling device of a hollow photonic band gap optical fiber ring and an integrated optical chip based on a composite light guide mechanism is characterized by comprising: the optical fiber comprises a hollow photonic band gap optical fiber ring with a composite light guide mechanism, a clamp and an integrated optical chip;
the end face of the hollow photonic band gap fiber ring is fixed to a light outlet of the integrated optical chip by the clamp, and the end face of the hollow photonic band gap fiber is directly coupled with the waveguide on the integrated optical chip;
the hollow photonic band gap fiber ring converts a light guide mechanism of a fiber segment at one end coupled with a light outlet of the integrated optical chip into total internal reflection by injecting optical cement;
the manufacturing method of the hollow photonic band gap optical fiber ring with the composite light guide mechanism comprises the following steps: injecting high-refractive-index optical cement into a large core air hole of a hollow photonic band-gap fiber section, and injecting low-refractive-index optical cement into a small cladding air hole of the hollow photonic band-gap fiber section, so that the core refractive index of the hollow photonic band-gap fiber of the glue injection part is greater than the cladding refractive index, the light guide mechanism is converted into total internal reflection, and the light guide mechanism and the non-glue injection hollow photonic band-gap fiber form a hollow photonic band-gap fiber ring of a composite light guide mechanism.
2. The device according to claim 1, wherein the hollow-core photonic band-gap fiber ring with the composite light guiding mechanism is characterized in that in the axial direction, the part where the high-refractive-index optical cement and the low-refractive-index optical cement exist simultaneously is marked as a hollow-core photonic band-gap fiber in a glue-injection a area, and the part where the high-refractive-index optical cement exists only is marked as a hollow-core photonic band-gap fiber in a glue-injection b area; the light guiding mechanism of the hollow photonic band gap fiber in the glue injection area a and the hollow photonic band gap fiber in the glue injection area b is total internal reflection.
3. The apparatus of claim 1, wherein the selection of the high index of refraction optical glue and the low index of refraction optical glue satisfies two conditions: (1) the mode field of a section of glue injection hollow photonic band gap fiber connected with the integrated optical chip is matched with the mode field of the waveguide in the integrated optical chip to the maximum extent; (2) the back reflection and loss on the interface of the injected part and the uninjected part of the hollow-core photonic band gap fiber are as small as possible.
4. The apparatus of claim 1, wherein the end face of the integrated optical chip is chamfered; establishing a model for direct coupling of the hollow-core photonic band-gap fiber and the waveguide on the integrated optical chip through simulation software, simulating different coupling angles, calculating direct coupling efficiency, obtaining an optimal coupling angle, and grinding the coupling end face of the hollow-core photonic band-gap fiber according to the optimal coupling angle.
5. A method for directly coupling a hollow photonic band gap optical fiber ring and an integrated optical chip based on a composite light guide mechanism is characterized by comprising the following steps:
step 1, obtaining a flat end face of a hollow photonic band gap fiber by using a cutting knife, and cleaning a section;
injecting high-refractive-index optical cement into a large core air hole on the end face of the hollow photonic band-gap optical fiber ring, injecting low-refractive-index optical cement into a small cladding air hole on the end face of the hollow photonic band-gap optical fiber ring, and finally converting the core refractive index of the hollow photonic band-gap optical fiber into the cladding refractive index, wherein the light guide mechanism is converted into total internal reflection and forms a hollow photonic band-gap optical fiber ring of a composite light guide mechanism with the hollow photonic band-gap optical fiber which is not injected with glue; the optical fiber mode field of the part of the hollow photonic band gap fiber, in which the high-refractive-index optical cement and the low-refractive-index optical cement exist simultaneously, is matched with the waveguide mode field on the integrated optical chip to the maximum extent;
step 3, directly coupling the hollow photonic band gap optical fiber ring with the composite light guide mechanism with the integrated optical chip;
beveling the end face of the integrated optical chip; establishing a model for directly coupling the hollow photonic band-gap fiber and the waveguide on the integrated optical chip through simulation software, simulating different coupling angles, calculating direct coupling efficiency, obtaining an optimal coupling angle under the maximum coupling efficiency, and grinding the coupling end face of the hollow photonic band-gap fiber with a composite light guide mechanism according to the optimal coupling angle; and fixing the end face of the ground hollow photonic band gap optical fiber ring to a light outlet of the integrated optical chip through a clamp.
6. The method according to claim 5, wherein in step 2, the selection of the high refractive index optical cement and the low refractive index optical cement satisfies two conditions: (1) the mode field of a section of glue injection hollow photonic band gap fiber connected with the integrated optical chip is matched with the mode field of the waveguide in the integrated optical chip to the maximum extent; (2) the back reflection and loss on the interface of the injected part and the uninjected part of the hollow-core photonic band gap fiber are as small as possible.
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