CN111273391A - Symmetric MZ structure double-core optical fiber and manufacturing method thereof - Google Patents
Symmetric MZ structure double-core optical fiber and manufacturing method thereof Download PDFInfo
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- CN111273391A CN111273391A CN202010226482.8A CN202010226482A CN111273391A CN 111273391 A CN111273391 A CN 111273391A CN 202010226482 A CN202010226482 A CN 202010226482A CN 111273391 A CN111273391 A CN 111273391A
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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Abstract
The embodiment of the invention provides a symmetrical MZ structure double-core optical fiber and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: cutting the dual-core optical fiber to be processed into n dual-core optical fiber cutting sections M1, M2 and … … Mn, wherein n is an integer greater than 1; reversely welding the double-core optical fiber cutting sections M1, M2 and … … Mn at each breaking point of the double-core optical fiber cutting sections M1, M2 and … … Mn to form a processed double-core optical fiber; and respectively connecting a single-mode optical fiber S1 and a single-mode optical fiber S2 at two ends of the processed double-core optical fiber. The symmetrical MZ structure double-core optical fiber has the characteristics of electromagnetic interference resistance, stable performance, large transmission capacity and the like, and also has the advantages of symmetry, complete coherence and higher reliability.
Description
Technical Field
The invention relates to the fields of optical fiber filtering, optical fiber sensing and all-optical information processing, in particular to a symmetrical MZ structure twin-core optical fiber and a manufacturing method thereof.
Background
At present, with the rapid development of the information age, the development of optical fiber communication and optical fiber sensing technologies is more and more mature. Compared with the traditional electric sensor, the optical fiber sensor has the advantages of electromagnetic interference resistance, high reliability, corrosion resistance, stable performance, low transmission loss, large transmission capacity, light weight, wide measurement parameters and the like, and is widely applied to the sensing field, wherein the Mach-Zehnder interference technology is one of important directions of research of people and has great application value.
The dual-core fiber Mach-Zehnder interferometer has good stability, under the same disturbance, the spectrum of the Mach-Zehnder interferometer made of two 3dB fiber couplers is changed violently, and under an ideal state, the spectrum of the dual-core fiber Mach-Zehnder interferometer is hardly changed.
In fact, in the manufacturing process of the dual-core optical fiber, the two cores cannot be completely consistent, assuming that the refractive indexes of the two cores are n1 and n2, n1 is approximately equal to n2, the physical length is L, the optical paths of light in the two cores are c1 and c2, respectively, the optical path difference is Δ c, the time for the two beams of light to reach the end position of the dual-core optical fiber is t1 and t2, the time difference is Δ t1, and the propagation speed of the light in vacuum is c. The optical path difference is Δ c, c1-c2, n 1-L-n 2-L, and the time difference of reaching the end position of the dual-core fiber is Δ t1, t1-t2, L (n1-n2)/c, so that the two beams are not completely coherent, which may cause adverse effects on the application of the dual-core fiber in the transmission and sensing fields.
Disclosure of Invention
The embodiment of the invention aims to provide a symmetrical MZ structure double-core optical fiber and a manufacturing method thereof, aiming at solving the problem that the refractive indexes of two fiber cores of the existing double-core optical fiber are not completely the same due to the manufacturing process and the like.
In order to achieve the above object, an embodiment of the present invention provides a method for manufacturing a symmetric MZ structure dual-core optical fiber, where the method includes the following steps: cutting a double-core optical fiber to be processed into n double-core optical fiber cutting sections M1, M2 and … … Mn, wherein n is an integer larger than 1; step two, reversely welding the double-core optical fiber cutting sections M1, M2 and … … Mn at each break point of the double-core optical fiber cutting sections M1, M2 and … … Mn to form a processed double-core optical fiber; and step three, respectively connecting a single-mode optical fiber S1 and a single-mode optical fiber S2 at two ends of the processed double-core optical fiber.
Optionally, in the first step, the dual-core optical fiber to be processed is averagely cleaved and divided into n pieces of dual-core optical fiber cleaved segments M1, M2, … … Mn.
Optionally, n is 2 or an integer multiple of 2.
Optionally, the core radius of the dual-core optical fiber is 4.1 μm, and the distance between cores is 33 μm.
On the other hand, the invention provides a symmetrical MZ structure double-core optical fiber which is obtained by adopting the manufacturing method of the symmetrical MZ structure double-core optical fiber.
Through above-mentioned technical scheme, the beneficial effect that can bring is: the defects of an existing twin-core fiber MZ interference structure are overcome, the twin-core fiber is cut into segments and then is reversely welded at break points, the problem that the refractive indexes of two fiber cores are not identical due to the problems of manufacturing processes and the like is solved, light passes through a symmetrical novel MZ structure, the time of two light beams in the two fiber cores reaching the tail end of the twin-core fiber is consistent, and the two light beams are completely coherent. Ideally, t1 is t2, but during the cleaving process, the position of one half of the dual-core fiber cannot be strictly guaranteed, a slight error of Δ L exists, and a time difference of reaching the end of the fiber is generated, wherein Δ t is ± 2 Δ L (n1-n2)/c, and is significantly smaller than Δ t1, and the influence of Δ t can be ignored.
The structure of the invention is suitable for the fields of optical fiber filtering, optical fiber sensing, all-optical information processing and the like, and has the characteristics of electromagnetic interference resistance, stable performance, large transmission capacity and the like of the optical fiber, as well as symmetry, complete coherence and higher reliability.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 and fig. 2 are schematic diagrams of a symmetric MZ structure dual-core optical fiber according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a symmetric MZ structure twin-core fiber according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a symmetric MZ structure twin-core fiber according to the third embodiment of the invention;
FIG. 5 is a schematic diagram of a symmetric MZ structure twin-core fiber according to four embodiments of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
The invention provides a manufacturing method of a symmetrical MZ structure double-core optical fiber, which comprises the following steps:
cutting a double-core optical fiber to be processed into n double-core optical fiber cutting sections M1, M2 and … … Mn, wherein n is an integer larger than 1;
step two, reversely welding the double-core optical fiber cutting sections M1, M2 and … … Mn at each break point of the double-core optical fiber cutting sections M1, M2 and … … Mn to form a processed double-core optical fiber;
and step three, respectively connecting a single-mode optical fiber S1 and a single-mode optical fiber S2 at two ends of the processed double-core optical fiber.
According to the manufacturing method of the symmetrical MZ structure twin-core fiber, the defects of an existing twin-core fiber MZ interference structure are overcome, the twin-core fiber is cut into the segments and then is reversely welded at the break points, the problem that the refractive indexes of two fiber cores are not identical due to the problems of manufacturing processes and the like is solved, and the time for two light beams in the two fiber cores to reach the tail end of the twin-core fiber is consistent through the symmetrical novel MZ structure, so that the two light beams are completely coherent. The structure of the invention is suitable for the fields of optical fiber filtering, optical fiber sensing, all-optical information processing and the like, and has the characteristics of electromagnetic interference resistance, stable performance, large transmission capacity and the like of the optical fiber, as well as symmetry, complete coherence and higher reliability.
Preferably, in order to make the dual-core optical fiber have better symmetry, the dual-core optical fiber can be uniformly cut, that is, in the step one, the dual-core optical fiber to be processed is equally cut and divided into n dual-core optical fiber cut segments M1, M2 and … … Mn.
Preferably, in order to make the manufacturing method of the symmetric MZ structure dual-core fiber convenient to operate and obtain the structurally strictly symmetric dual-core fiber, n may be 2 or an integer multiple of 2. Thus, when n is 2, the dual-core optical fiber to be processed is averagely cut and divided into n dual-core optical fiber cut sections M1, M2 and … … Mn, wherein the dual-core optical fiber to be processed can be cut from the middle half part, so that the dual-core optical fiber with strictly symmetrical structure is obtained; when n is 4, the dual-core optical fiber to be processed is cut from the middle half position, reversely welded at the break point, then cut and reversely welded at the quarter position, and cut and reversely welded at the three quarter position, so as to obtain the dual-core optical fiber with strictly symmetrical structure; when n is 8, the dual-core optical fiber to be processed may be cut from the middle half, and reversely fused at the break point, and then cut and reversely fused at the eighth, the quarter, the third eighth, the fifth eighth, the third quarter, and the seventh eighth, respectively, so as to obtain the dual-core optical fiber with strictly symmetrical structure.
More preferably, the core radius of the dual-core optical fiber is 4.1 μm, and the inter-core distance is 33 μm.
On the other hand, the invention also provides a symmetrical MZ structure double-core optical fiber which is obtained by adopting the manufacturing method of the symmetrical MZ structure double-core optical fiber.
This symmetry MZ structure twin-core fiber has overcome the not enough of current twin-core fiber MZ interference structure, cuts double-core fiber and welds in breakpoint department reverse behind the double-core fiber cutting section, has compensatied because the not identical problem of two fibre core refracting indexes of preparation technology scheduling problem, and light passes through the novel MZ structure of symmetry, and two light beams in two fibre cores arrive the time unanimity at the twin-core fiber end, make it totally coherent. The structure of the invention is suitable for the fields of optical fiber filtering, optical fiber sensing, all-optical information processing and the like, and has the characteristics of electromagnetic interference resistance, stable performance, large transmission capacity and the like of the optical fiber, as well as symmetry, complete coherence and higher reliability.
Exemplary embodiments of a symmetric MZ structure dual-core optical fiber and a method for fabricating the same according to the present invention are described in detail below with reference to the accompanying drawings.
Example one
Referring to fig. 1 and 2, an exemplary symmetric MZ structure dual-core fiber is shown. When a symmetrical MZ structure twin-core fiber is manufactured, the twin-core fiber 5 including the first fiber core 6 and the second fiber core 7 is cut from the middle half to obtain the first half 1 and the second half 2 of the first fiber core 6 and the first half 3 and the second half 4 of the second fiber core 7. And (3) reverse fusion welding is carried out at a breakpoint, namely the first half section 1 of the first fiber core 6 is connected with the second half section 4 of the second fiber core 7, the first half section 3 of the second fiber core 7 is connected with the second half section 2 of the first fiber core 6, and finally, the two ends of the double-core fiber which is fused again are connected with the single- mode fibers 8 and 9.
The dual core optical fiber described in this embodiment preferably has a core radius of 4.1 μm and an inter-core distance of 33 μm.
Example two
Referring to FIG. 3, an exemplary symmetric MZ structure dual-core fiber is shown. When the symmetrical MZ structure dual-core fiber is manufactured, the dual-core fiber 5 comprising the first fiber core 6 and the second fiber core 7 is cut from the middle half 11, is reversely welded at a breaking point, is cut and reversely welded at the quarter 10, and is finally cut and reversely welded at the third quarter 12, and the obtained dual-core fiber is symmetrical in structure. And finally, connecting the two ends of the double-core optical fiber which is welded again with the single-mode optical fibers 8 and 9.
The dual core optical fiber described in this embodiment preferably has a core radius of 4.1 μm and an inter-core distance of 33 μm.
EXAMPLE III
Referring to FIG. 4, an exemplary symmetric MZ structure dual-core fiber is shown. When a symmetrical MZ-structured two-core optical fiber is manufactured, the two-core optical fiber 5 including the first core 6 and the second core 7 is cut from the middle half 16, is reversely fused at a break point, is cut at the eighth 13, the quarter 14, the third eighth 15, the fifth eighth 17, the third quarter 18 and the seventh eighth 19, and is reversely fused, and the obtained two-core optical fiber is symmetrical in structure. And finally, connecting the two ends of the double-core optical fiber which is welded again with the single-mode optical fibers 8 and 9.
The dual core optical fiber described in this embodiment preferably has a core radius of 4.1 μm and an inter-core distance of 33 μm.
Example four
Referring to FIG. five, an exemplary symmetric MZ structure twin-core fiber is shown. When the symmetrical MZ structure dual-core optical fiber is manufactured, the dual-core optical fiber to be processed is averagely cut into n parts of integers, each section of the dual-core optical fiber is marked as M1, M2, M3, M4 and … … Mn, then the dual-core optical fiber is reversely welded at the break point of the optical fiber, namely, the M1 first fiber core M11 is connected with the M22 second fiber core M2, the M1 second fiber core M12 is connected with the M2 first fiber core M21, and the dual-core optical fiber which is welded again is sequentially welded to connect the two ends of the dual-core optical fiber with the single-mode optical fibers S1 and S2.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The use of the phrase "including an" as used herein does not exclude the presence of other, identical elements, components, methods, articles, or apparatus that may include the same, unless expressly stated otherwise.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (5)
1. A manufacturing method of a symmetrical MZ structure double-core optical fiber comprises the following steps:
cutting a double-core optical fiber to be processed into n double-core optical fiber cutting sections M1, M2 and … … Mn, wherein n is an integer larger than 1;
step two, reversely welding the double-core optical fiber cutting sections M1, M2 and … … Mn at each break point of the double-core optical fiber cutting sections M1, M2 and … … Mn to form a processed double-core optical fiber;
and step three, respectively connecting a single-mode optical fiber S1 and a single-mode optical fiber S2 at two ends of the processed double-core optical fiber.
2. The method for manufacturing the symmetrical MZ-structured dual-core optical fiber according to claim 1, wherein in step one, the dual-core optical fiber to be processed is equally cleaved and divided into n pieces of dual-core fiber cleaved segments M1, M2, … … Mn.
3. The method of claim 2, wherein the method comprises: and n is 2 or an integral multiple of 2.
4. The method for manufacturing the symmetrical MZ structure twin-core fiber of any one of claims 1 to 3, wherein said twin-core fiber has a core radius of 4.1 μm and an inter-core distance of 33 μm.
5. A symmetric MZ structure dual-core optical fiber obtained by the method of making a symmetric MZ structure dual-core optical fiber according to any one of claims 1 to 4.
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