CN104765105A - Mechanical transfer (MT) inserting core and single mode fiber connector - Google Patents
Mechanical transfer (MT) inserting core and single mode fiber connector Download PDFInfo
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- CN104765105A CN104765105A CN201510188577.4A CN201510188577A CN104765105A CN 104765105 A CN104765105 A CN 104765105A CN 201510188577 A CN201510188577 A CN 201510188577A CN 104765105 A CN104765105 A CN 104765105A
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- 239000000835 fiber Substances 0.000 title claims abstract description 84
- 238000003780 insertion Methods 0.000 claims abstract description 22
- 230000037431 insertion Effects 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims description 127
- 239000013307 optical fiber Substances 0.000 claims description 53
- 239000012792 core layer Substances 0.000 claims description 37
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000005253 cladding Methods 0.000 claims description 10
- 230000008054 signal transmission Effects 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 6
- 230000009347 mechanical transmission Effects 0.000 description 6
- 210000001503 joint Anatomy 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
- G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type
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- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The embodiment of the invention provides a mechanical transfer (MT) inserting core and a single mode fiber connector. The MT inserting core comprises a first hole, and a first waveguide is inserted into the first hole, and comprises a first single mode fiber, a second sub-waveguide and a third sub-waveguide. When a light signal is transmitted through the first single mode fiber, the second sub-waveguide and the third sub-waveguide in sequence, the mode field of a fundamental mode of the light signal is enlarged in the second sub-waveguide, the light signal is excited to at least one high order mode in the third sub-waveguide, the fundamental mode and the excited high order modes of the light signal interfere with each other in the third sub-waveguide, and a mode field of the light signal is enlarged. Due to the fact that the mode field of the light signal is enlarged, under the conditions of that the dust size of the MT inserting core is not changed, the dust prevention performance of the MT inserting core is improved to a certain degree, and then the insertion loss of the fiber connector adopting the MT inserting core is reduced to a certain degree.
Description
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a Mechanical Transmission (MT) ferrule and a single-mode optical fiber connector.
Background
The carriers of optical information are optical fibers, which are mainly classified into two categories: single mode optical fibers and multimode optical fibers. The optical fiber connector solves the mainstream trend of information transmission between board levels and cabinets, and can precisely butt joint two end faces of an optical fiber so as to ensure that light energy output by a transmitting optical fiber can be coupled into a receiving optical fiber to the maximum extent. Based on the classification of single-mode fibers and multimode fibers, fiber connectors are also classified into single-mode fiber connectors and multimode fiber connectors, wherein the core diameter of a single-mode fiber in a single-mode fiber connector is usually 8-10 μm, and the single-mode fiber connector is suitable for long-distance transmission.
Typically, single mode fiber optic connectors are made up of three parts: the adapter is used for ensuring butt joint between the male head and the female head, the male head and the female head respectively comprise a Mechanical Transmission (MT) insertion core, the single-mode optical fibers inserted in the MT insertion core of the male head and the single-mode optical fibers inserted in the MT insertion core of the female head are in one-to-one correspondence, and a signal coupling relationship exists between each single-mode optical fiber positioned in the MT insertion core of the male head and the corresponding single-mode optical fiber positioned in the MT insertion core of the female head.
In the prior art, because the core diameter of the single-mode fiber is very small, it is difficult to accurately align the end surface of the single-mode fiber located in the MT ferrule of the male connector and the corresponding end surface of the single-mode fiber located in the MT ferrule of the female connector, and thus the insertion loss of the optical fiber connector is easily large.
Disclosure of Invention
The embodiment of the invention provides a mechanical transmission MT insertion core and a single-mode optical fiber connector, which are used for reducing the insertion loss of the optical fiber connector using the MT insertion core to a certain extent.
In a first aspect, an embodiment of the present invention provides a mechanical transmission MT ferrule, where the MT ferrule includes a first hole, and a first waveguide is inserted in the first hole, where the first waveguide includes a first single-mode fiber, a second sub-waveguide, and a third sub-waveguide;
the first end of the first single-mode fiber is a tail fiber end of the first waveguide, and the second end of the third sub-waveguide is a splicing end of the first waveguide; the second end of the first single-mode optical fiber is communicated with the first end of the second sub-waveguide, and the second end of the second sub-waveguide is communicated with the first end of the third sub-waveguide; the first single-mode fiber is used for receiving a first optical signal through a first end of the first single-mode fiber and transmitting the first optical signal to the second sub-waveguide through a second end of the first single-mode fiber;
the second sub-waveguide is configured to receive the first optical signal through a first end of the second sub-waveguide, expand a fundamental mode field diameter of the first optical signal, and obtain the first optical signal with the expanded fundamental mode field diameter, and transmit the first optical signal with the expanded fundamental mode field diameter to the third sub-waveguide through a second end of the second sub-waveguide, where the first optical signal with the expanded fundamental mode field diameter will be excited into more than one higher-order mode in the third sub-waveguide when transmitted to the third sub-waveguide;
the third sub-waveguide is configured to receive the first optical signal with the expanded fundamental mode field diameter through a first end of the third sub-waveguide, where the first optical signal with the expanded fundamental mode field diameter is excited to generate one or more higher-order modes in the third sub-waveguide to obtain a second optical signal, and the higher-order modes of the second optical signal and the fundamental mode of the second optical signal both interfere in the third sub-waveguide to obtain the interfered second optical signal;
the third sub-waveguide is further configured to transmit the interfered second optical signal through a second end of the third sub-waveguide.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the third sub-waveguide is further configured to receive a third optical signal through the second end of the third sub-waveguide, where the third optical signal includes more than one higher-order mode and a fundamental mode, the higher-order modes of the third optical signal undergo destructive interference at a joint of the third sub-waveguide and the second sub-waveguide, and the fundamental mode of the third optical signal undergoes constructive interference at the joint of the third sub-waveguide and the second sub-waveguide, so as to obtain a fourth optical signal; the third sub-waveguide is further configured to transmit the fourth optical signal to the second sub-waveguide through a first end of the third sub-waveguide;
the second sub-waveguide is further configured to receive the fourth optical signal from the third sub-waveguide through a second end of the second sub-waveguide, and reduce a fundamental mode field diameter of the fourth optical signal, so as to obtain the fourth optical signal with a reduced fundamental mode field diameter; the second sub-waveguide is further used for transmitting the fourth optical signal with the reduced fundamental mode field diameter to the first single-mode optical fiber through the first end of the second sub-waveguide;
the first single-mode fiber is further configured to receive the fourth optical signal with the reduced fundamental mode field diameter through the second end of the first single-mode fiber, and transmit the fourth optical signal with the reduced fundamental mode field diameter through the first end of the first single-mode fiber.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the MT ferrule further includes at least one second hole, and one first waveguide is inserted into each second hole.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, in a case where the third sub-waveguide is a multimode optical fiber, the second sub-waveguide expands a fundamental mode field diameter of the first optical signal so that the fundamental mode field diameter of the first optical signal is greater than or equal to 50 μm and less than or equal to 250 μm.
With reference to the first aspect or any one of the first to the third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, a length of the second sub-waveguide in the first optical signal transmission direction is greater than or equal to 1 mm.
With reference to the first aspect or any one of the first to the fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the third sub-waveguide has a length ofWherein, weIs the equivalent width of the third sub-waveguide core layer, andw is the width of the third sub-waveguide core layer, nrIs said third sub-waveguideRefractive index of waveguide core layer, ncλ is a wavelength at which an optical signal is transmitted in free space, which is a refractive index of a cladding of the third wavelet waveguide.
With reference to the first aspect or any one of the first to the fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the cross section of the third sub-waveguide is circular, and the diameter of the cross section of the third sub-waveguide is greater than or equal to 50 μm and less than or equal to 250 μm; or the cross section of the third sub-waveguide is rectangular, and the width of the cross section of the third sub-waveguide is greater than or equal to 50 μm and less than or equal to 250 μm.
With reference to the first aspect or any one of the first to the sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, an area of an end face of the second end of the first single-mode fiber is equal to an area of an end face of the first end of the second sub-waveguide, an area of an end face of the second end of the first single-mode fiber is in contact with an area of an end face of the first end of the second sub-waveguide, and the area of the contact is equal to the area of an end face of the second end of the first single-mode fiber.
With reference to the first aspect or any one of the first possible implementation manner to the sixth possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, a cross-sectional area of a core layer of the first single-mode optical fiber is equal to an end-face area of the first end of the second sub-waveguide, a cross-section of the core layer of the first single-mode optical fiber is in contact with an end-face of the first end of the second sub-waveguide, and a contact area between the cross-section of the core layer of the first single-mode optical fiber and the end-face of the first end of the second sub-waveguide is equal to the cross-sectional area of the core layer of the first single-mode optical fiber; the cross section of the core layer of the first single-mode optical fiber is a cross section of the core layer of the first single-mode optical fiber along a direction perpendicular to the transmission direction of the first optical signal.
With reference to the first aspect or any one of the first to the eighth possible implementation manners of the first aspect, in a ninth possible implementation manner of the first aspect, an area of an end surface of the second end of the second sub-waveguide is equal to an area of an end surface of the first end of the third sub-waveguide, an end surface of the second end of the second sub-waveguide is in contact with an end surface of the first end of the third sub-waveguide, and the contact area is equal to the area of an end surface of the second end of the second sub-waveguide.
With reference to the first aspect or any one of the first possible implementation manner to the ninth possible implementation manner of the first aspect, in a tenth possible implementation manner of the first aspect, the cross section of the second sub-waveguide is circular, centers of a plurality of cross sections of the second sub-waveguide are located on the same straight line, and a second end cross-sectional diameter of the second sub-waveguide is larger than a first end cross-sectional diameter of the second sub-waveguide; the diameter of the cross section of the second sub-waveguide is larger along the transmission direction of the first optical signal, wherein the cross section of the second sub-waveguide is the cross section of the second sub-waveguide along the direction perpendicular to the transmission direction of the first optical signal.
With reference to the tenth possible implementation manner of the first aspect, in an eleventh possible implementation manner of the first aspect, the cross-sectional diameter of the second sub-waveguide becomes uniformly larger along the transmission direction of the first optical signal.
In a second aspect, an embodiment of the present invention provides a single-mode optical fiber connector, including a male connector and a female connector, where the male connector and the female connector both include the MT ferrule as described in any one of the possible embodiments of the first aspect or the first aspect, and the female connector also includes an MT ferrule, the MT ferrule of the male connector is provided with a guide pin, and the MT ferrule of the female connector is provided with a guide hole, and the guide pin is inserted into the guide hole.
The embodiment of the invention discloses an MT (fiber termination) ferrule and a single-mode fiber connector, wherein the MT ferrule comprises a first hole, a first waveguide is inserted into the first hole, and the first waveguide comprises a first single-mode fiber, a second sub-waveguide and a third sub-waveguide; when an optical signal is transmitted sequentially through the first single-mode fiber, the second sub-waveguide and the third sub-waveguide, a fundamental mode field diameter of the optical signal is enlarged in the second sub-waveguide, at least one high-order mode is excited in the third sub-waveguide, and the fundamental mode and the excited high-order mode of the optical signal are interfered in the third sub-waveguide, so that the mode field of the optical signal is enlarged.
Moreover, for the single-mode optical fiber connector with the MT insertion core used by the male head and the female head, as the mode fields of the optical signals of the MT insertion core positioned on the male head and the female head are enlarged, the precision requirement is reduced when the male head and the female head are aligned, so that the process complexity of the male head and the female head in alignment is reduced; moreover, because the mode fields of the optical signals of the MT inserting cores of the male connector and the female connector are enlarged, the dustproof performance of the single-mode optical fiber connector is improved under the condition that the sizes of dust at the butt joint ends of the male connector and the female connector are not changed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a single-mode fiber optic connector according to an embodiment of the present invention;
fig. 2 is a first cross-sectional view of an MT ferrule according to an embodiment of the present invention;
fig. 3 is a sectional view of a MT ferrule according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of an MT ferrule according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem that precise alignment between single-mode optical fibers is difficult to achieve in the prior art, and thus insertion loss is easily caused, the present invention provides a mechanical transmission MT ferrule, fig. 1 is a schematic diagram of a single-mode optical fiber connector provided by the present invention, and as shown in fig. 1, the single-mode optical fiber connector includes: the male head and the female head respectively comprise MT insertion cores, the MT insertion cores of the male heads are provided with guide needles, the MT insertion cores of the female heads are provided with guide holes, and the guide needles are inserted in the guide holes. Typically, the single mode fiber optic connector also includes an adapter and a housing, the adapter being positioned between the male and female connectors for securing the male and female connectors. The MT ferrule provided by the present invention is first described below.
Fig. 2 is a first cross-sectional view of an MT ferrule according to an embodiment of the present invention, and as shown in fig. 2, the MT ferrule according to the present invention includes a first hole, a first waveguide is inserted into the first hole, and the first waveguide includes a first single-mode fiber 1, a second sub-waveguide 2, and a third sub-waveguide 3; the first end 4 of the first single-mode fiber 1 is a tail fiber end of the first waveguide, and the second end 5 of the third sub-waveguide 3 is a splicing end of the first waveguide; the second end 6 of the first single-mode fiber 1 is communicated with the first end 7 of the second sub-waveguide 2, the second end 8 of the second sub-waveguide 2 is communicated with the first end 9 of the third sub-waveguide 3, and the first single-mode fiber 1 is used for receiving the first optical signal through the first end 4 of the first single-mode fiber 1 and transmitting the first optical signal to the second sub-waveguide 2 through the second end 6 of the first single-mode fiber 1; the second sub-waveguide 2 is configured to receive the first optical signal through a first end 7 of the second sub-waveguide 2, and expand a fundamental mode field diameter of the first optical signal, the second sub-waveguide 2 is further configured to transmit the first optical signal with the expanded fundamental mode field diameter to the third sub-waveguide 3 through a second end 8 of the second sub-waveguide 2, and when the first optical signal with the expanded fundamental mode field diameter is transmitted to the third sub-waveguide 3, more than one high-order mode is excited in the third sub-waveguide 3; the third sub-waveguide 3 is configured to receive the first optical signal with the expanded fundamental mode field diameter through the first end 9 of the third sub-waveguide 3, where the first optical signal with the expanded fundamental mode field diameter is excited in the third sub-waveguide 3 to form more than one higher-order mode, so as to obtain a second optical signal, and the higher-order mode of the second optical signal and the fundamental mode of the second optical signal are interfered in the third sub-waveguide 3, so as to obtain an interfered second optical signal; the third sub-waveguide 3 is further configured to transmit the interfered second optical signal out through the second end 5 of the third sub-waveguide 3.
Further, the third sub-waveguide 3 is further configured to receive a third optical signal through the second end 5 of the third sub-waveguide 3, where the third optical signal includes more than one higher-order mode and a fundamental mode, the higher-order mode of the third optical signal undergoes destructive interference at a joint of the third sub-waveguide 3 and the second sub-waveguide 2, and the fundamental mode of the third optical signal undergoes constructive interference at a joint of the third sub-waveguide 3 and the second sub-waveguide 2, so as to obtain a fourth optical signal; the third sub-waveguide 3 is further configured to transmit a fourth optical signal to the second sub-waveguide 2 through the first end 9 of the third sub-waveguide 3; the second sub-waveguide 2 is also used for receiving a fourth optical signal from the third sub-waveguide 3 through the second end 8 of the second sub-waveguide 2 and reducing the fundamental mode field diameter of the fourth optical signal; the second sub-waveguide 2 is further configured to transmit a fourth optical signal with the reduced fundamental mode field diameter to the first single-mode optical fiber 1 through the first end of the second sub-waveguide 2; the first single mode fiber 1 is further configured to receive the fourth optical signal with the reduced fundamental mode field diameter through the second end 6 of the first single mode fiber 1, and transmit the fourth optical signal with the reduced fundamental mode field diameter through the first end 4 of the first single mode fiber 1.
Optionally, the MT ferrule further includes at least one second hole, each second hole having one first waveguide inserted therein.
The length of the second sub-waveguide 2 in the first optical signal transmission direction is greater than or equal to 1 mm. The section of the second sub-waveguide 2 is circular, the centers of a plurality of sections of the second sub-waveguide 2 are located on the same straight line, and the section diameter of a second end 8 of the second sub-waveguide 2 is larger than that of a first end 7 of the second sub-waveguide 2; the cross-sectional diameter of the second sub-waveguide 2 along the transmission direction of the first optical signal is larger, wherein the cross-section of the second sub-waveguide 2 refers to the cross-section of the second sub-waveguide 2 along the direction perpendicular to the transmission direction of the first optical signal. And the cross-sectional diameter of the second sub-waveguide 2 becomes uniformly large along the transmission direction of the first optical signal.
The third sub-waveguide 3 has a length ofWherein, weIs the equivalent width of the core layer of the third sub-waveguide, andw is the width of the core layer of the third sub-waveguide, nrIs the refractive index of the core layer of the third sub-waveguide, ncλ is the wavelength at which an optical signal propagates in free space, which is the refractive index of the cladding of the third wavelet waveguide. Wherein the cross section of the third sub-waveguide 3 is circular, and the diameter of the cross section of the third sub-waveguide 3 is greater than or equal to 50 μm and less than or equal to 250 μm; alternatively, the cross section of the third sub-waveguide 3 is rectangular, and the width of the cross section of the third sub-waveguide 3 is greater than or equal to 50 μm and less than or equal to 250 μm.
Specifically, the specific method of determining the length of the third sub-waveguide 3 described above is as follows: according to the principle of multimode interference, 0 order in the waveguideAnd resonant length of 1 st order guided modeWherein beta is0Is the propagation constant of the 0 th order guided mode, beta1Is the propagation constant of the 1 st order guided mode, weThe equivalent width of the third sub-waveguide core layer,w is the width of the core layer of the third sub-waveguide, nrIs the refractive index of the core layer of the third sub-waveguide, ncIs the refractive index of the cladding of the third sub-wave guide, lambda is the wavelength of the optical signal transmitted in free space, and when the sum of the lengths of the third sub-wave guides 3 of the male head and the female head isThen, the transmission from the single-mode waveguide to the single-mode waveguide can be realized, so that for a single male head and a single female head, the length of the third sub-waveguide 3 is equal to that of the single male head and the single female headFurther, when the end face of the second end 5 of the third sub-waveguide 3 is ground by a grinding technique, the length of the third sub-waveguide 3 isWherein Δ L is the distance from the ground position of the second end 5 of the third sub-waveguide 3 to the original second end 5.
Further, in the case where the third sub-waveguide 3 is a multimode optical fiber, the second sub-waveguide 2 enlarges the fundamental mode field diameter of the first optical signal so that the fundamental mode field diameter of the first optical signal is 50 μm or more and 250 μm or less.
Alternatively, fig. 3 is a cross-sectional view of a MT ferrule according to an embodiment of the present invention, as shown in fig. 3, an end surface area of the second end 6 of the first single-mode fiber 1 is equal to an end surface area of the first end 7 of the second sub-waveguide 2, an end surface of the second end 6 of the first single-mode fiber 1 is in contact with an end surface of the first end 7 of the second sub-waveguide 2, and the contact area is equal to the end surface area of the second end 6 of the first single-mode fiber 1. In this case, the first single-mode optical fiber 1 and the second sub-waveguide 2 are generally integrally molded.
Alternatively, as shown in fig. 2, the cross-sectional area of the core layer of the first single-mode fiber 1 is equal to the end surface area of the first end 7 of the second sub-waveguide 2, the cross-section of the core layer of the first single-mode fiber 1 is in contact with the end surface of the first end 7 of the second sub-waveguide 2, and the contact area between the cross-section of the core layer of the first single-mode fiber 1 and the end surface of the first end 7 of the second sub-waveguide 2 is equal to the cross-sectional area of the core layer of the first single-mode fiber 1; the cross section of the core layer of the first single-mode fiber 1 refers to a cross section of the core layer of the first single-mode fiber 1 along a direction perpendicular to the transmission direction of the first optical signal, and in this case, the core layer of the first single-mode fiber 1 and the second sub-waveguide 2 are integrally formed.
Further, as shown in fig. 2 and fig. 3, the area of the end surface of the second end 8 of the second sub-waveguide 2 is equal to the area of the end surface of the first end 9 of the third sub-waveguide 3, the end surface of the second end 8 of the second sub-waveguide 2 is in contact with the end surface of the first end 9 of the third sub-waveguide 3, and the contact area is equal to the area of the end surface of the second end 8 of the second sub-waveguide 2. Usually the second sub-waveguide 2 and the third sub-waveguide 3 are integrally formed.
Fig. 4 is a schematic perspective view of an MT ferrule according to an embodiment of the present invention, and as shown in fig. 4, the MT ferrule further includes a housing, an optical fiber fixing hole 10 is formed on an upper surface of the housing, and the single mode fiber 1 is fixed by filling glue in the optical fiber fixing hole, and generally, an optical fiber sleeve 11 is further provided, one end of which is fixed in the MT ferrule and is used for fixing the single mode fiber 1.
It is worth to be noted that the second sub-waveguide comprises a second sub-waveguide cladding layer and a second sub-waveguide core layer, the second sub-waveguide cladding layer is wrapped on the outer side of the second sub-waveguide core layer, and the refractive index of the second sub-waveguide core layer is larger than that of the second sub-waveguide cladding layer. The third sub-waveguide generally includes a third sub-waveguide cladding layer and a third sub-waveguide core layer, the third sub-waveguide cladding layer is wrapped outside the third sub-waveguide core layer, and the refractive index of the third sub-waveguide core layer is greater than that of the third sub-waveguide cladding layer.
The second sub-waveguide in the present invention may be a tapered-width optical fiber, and the third sub-waveguide may be a multimode optical fiber, wherein the tapered-width optical fiber is a result of a change in shape and structure of the multimode optical fiber, and the single-mode optical fiber is a result of a change in shape and structure of the tapered-width optical fiber.
The embodiment of the invention provides an MT (fiber termination) ferrule, which comprises a first hole, wherein a first waveguide is inserted into the first hole and comprises a first single-mode fiber, a second sub-waveguide and a third sub-waveguide; when an optical signal is transmitted sequentially through the first single-mode fiber, the second sub-waveguide and the third sub-waveguide, a fundamental mode field diameter of the optical signal is enlarged in the second sub-waveguide, at least one high-order mode is excited in the third sub-waveguide, and the fundamental mode and the excited high-order mode of the optical signal are interfered in the third sub-waveguide, so that the mode field of the optical signal is enlarged.
An embodiment of the present invention further provides a single-mode optical fiber connector, which is suitable for single-mode optical fibers such as LC and SC, and with reference to fig. 1, the optical fiber connector includes: the male head and the female head respectively comprise MT insertion cores, the MT insertion cores of the male heads are provided with guide needles, the MT insertion cores of the female heads are provided with guide holes, and the guide needles are clamped with the guide holes. Typically, the single mode fiber optic connector also includes an adapter and a housing, the adapter being positioned between the male and female connectors for securing the male and female connectors. The MT ferrule comprises a first hole, a first waveguide is inserted into the first hole, and the first waveguide comprises a first single mode fiber, a second sub-waveguide and a third sub-waveguide; the first end of the first single-mode fiber is a tail fiber end of the first waveguide, and the second end of the third sub-waveguide is a splicing end of the first waveguide; the second end of the first single-mode fiber is communicated with the first end of the second sub-waveguide, the second end of the second sub-waveguide is communicated with the first end of the third sub-waveguide, and the first single-mode fiber is used for receiving the first optical signal through the first end of the first single-mode fiber and transmitting the first optical signal to the second sub-waveguide through the second end of the first single-mode fiber; the second sub-waveguide is used for receiving the first optical signal through the first end of the second sub-waveguide and expanding the diameter of a fundamental mode field of the first optical signal, and is also used for transmitting the first optical signal with the expanded diameter of the fundamental mode field to the third sub-waveguide through the second end of the second sub-waveguide, and when the first optical signal with the expanded diameter of the fundamental mode field is transmitted to the third sub-waveguide, more than one high-order mode is excited in the third sub-waveguide; the third sub-waveguide is used for receiving the first optical signal with the expanded fundamental mode field diameter through the first end of the third sub-waveguide, wherein the first optical signal with the expanded fundamental mode field diameter is excited into more than one high-order mode in the third sub-waveguide to obtain a second optical signal, and the high-order mode of the second optical signal and the fundamental mode of the second optical signal are interfered in the third sub-waveguide to obtain an interfered second optical signal; the third sub-waveguide is also used for transmitting the interfered second optical signal out through the second end of the third sub-waveguide.
Because the mode fields of the optical signals of the MT insertion cores positioned on the male head and the female head are enlarged, the precision requirement is reduced when the male head and the female head are aligned, and the process complexity of the male head and the female head in alignment is reduced; moreover, because the mode fields of the optical signals of the MT inserting cores of the male connector and the female connector are enlarged, the dustproof performance of the single-mode optical fiber connector is improved under the condition that the sizes of dust at the butt joint ends of the male connector and the female connector are not changed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. The MT insertion core is characterized by comprising a first hole, a first waveguide is inserted into the first hole, and the first waveguide comprises a first single mode fiber, a second sub-waveguide and a third sub-waveguide;
the first end of the first single-mode fiber is a tail fiber end of the first waveguide, and the second end of the third sub-waveguide is a splicing end of the first waveguide; the second end of the first single-mode optical fiber is communicated with the first end of the second sub-waveguide, and the second end of the second sub-waveguide is communicated with the first end of the third sub-waveguide;
the first single-mode fiber is used for receiving a first optical signal through a first end of the first single-mode fiber and transmitting the first optical signal to the second sub-waveguide through a second end of the first single-mode fiber;
the second sub-waveguide is configured to receive the first optical signal through a first end of the second sub-waveguide, expand a fundamental mode field diameter of the first optical signal, and obtain the first optical signal with the expanded fundamental mode field diameter, and transmit the first optical signal with the expanded fundamental mode field diameter to the third sub-waveguide through a second end of the second sub-waveguide, where the first optical signal with the expanded fundamental mode field diameter will be excited into more than one higher-order mode in the third sub-waveguide when transmitted to the third sub-waveguide;
the third sub-waveguide is configured to receive the first optical signal with the expanded fundamental mode field diameter through a first end of the third sub-waveguide, where the first optical signal with the expanded fundamental mode field diameter is excited to generate one or more higher-order modes in the third sub-waveguide to obtain a second optical signal, and the higher-order modes of the second optical signal and the fundamental mode of the second optical signal both interfere in the third sub-waveguide to obtain the interfered second optical signal;
the third sub-waveguide is further configured to transmit the interfered second optical signal through a second end of the third sub-waveguide.
2. The MT ferrule of claim 1,
the third sub-waveguide is further configured to receive a third optical signal through the second end of the third sub-waveguide, the third optical signal includes more than one higher-order mode and a fundamental mode, the higher-order modes of the third optical signal undergo interference cancellation at the joint of the third sub-waveguide and the second sub-waveguide, and the fundamental mode of the third optical signal undergoes interference constructive at the joint of the third sub-waveguide and the second sub-waveguide, so as to obtain a fourth optical signal; the third sub-waveguide is further configured to transmit the fourth optical signal to the second sub-waveguide through a first end of the third sub-waveguide;
the second sub-waveguide is further configured to receive the fourth optical signal from the third sub-waveguide through a second end of the second sub-waveguide, and reduce a fundamental mode field diameter of the fourth optical signal, so as to obtain the fourth optical signal with a reduced fundamental mode field diameter; the second sub-waveguide is further used for transmitting the fourth optical signal with the reduced fundamental mode field diameter to the first single-mode optical fiber through the first end of the second sub-waveguide;
the first single-mode fiber is further configured to receive the fourth optical signal with the reduced fundamental mode field diameter through the second end of the first single-mode fiber, and transmit the fourth optical signal with the reduced fundamental mode field diameter through the first end of the first single-mode fiber.
3. The MT ferrule of claim 1 or 2,
the MT insertion core further comprises at least one second hole, and one first waveguide is inserted into each second hole.
4. The MT ferrule of any one of claims 1 to 3,
in the case where the third sub-waveguide is a multimode optical fiber, the second sub-waveguide enlarges a fundamental mode field diameter of the first optical signal so that the fundamental mode field diameter of the first optical signal is 50 μm or more and 250 μm or less.
5. The MT ferrule of any one of claims 1 to 4,
the length of the second sub-waveguide in the first optical signal transmission direction is greater than or equal to 1 mm.
6. The MT ferrule of any one of claims 1 to 5, wherein:
the third sub-waveguide has a length ofWherein, weIs the equivalent width of the third sub-waveguide core layer, andw is the width of the third sub-waveguide core layer, nrIs the refractive index of the third sub-waveguide core layer, ncλ is a wavelength at which an optical signal is transmitted in free space, which is a refractive index of a cladding of the third wavelet waveguide.
7. The MT ferrule of any one of claims 1 to 6,
the section of the third sub-waveguide is circular, and the diameter of the section of the third sub-waveguide is greater than or equal to 50 μm and less than or equal to 250 μm; or,
the cross section of the third sub-waveguide is rectangular, and the width of the cross section of the third sub-waveguide is greater than or equal to 50 μm and less than or equal to 250 μm.
8. The MT ferrule of any one of claims 1 to 7,
the end face area of the second end of the first single-mode fiber is equal to the end face area of the first end of the second sub-waveguide, the end face of the second end of the first single-mode fiber is in contact with the end face of the first end of the second sub-waveguide, and the contact area is equal to the end face area of the second end of the first single-mode fiber.
9. The MT ferrule of any one of claims 1 to 7,
the cross-sectional area of the core layer of the first single-mode fiber is equal to the end surface area of the first end of the second sub-waveguide, the cross-section of the core layer of the first single-mode fiber is in contact with the end surface of the first end of the second sub-waveguide, and the contact area between the cross-section of the core layer of the first single-mode fiber and the end surface of the first end of the second sub-waveguide is equal to the cross-sectional area of the core layer of the first single-mode fiber; the cross section of the core layer of the first single-mode optical fiber is a cross section of the core layer of the first single-mode optical fiber along a direction perpendicular to the transmission direction of the first optical signal.
10. The MT ferrule of any one of claims 1 to 9,
the area of the end face of the second end of the second sub-waveguide is equal to the area of the end face of the first end of the third sub-waveguide, the end face of the second end of the second sub-waveguide is in contact with the end face of the first end of the third sub-waveguide, and the contact area is equal to the area of the end face of the second end of the second sub-waveguide.
11. The MT ferrule of any one of claims 1 to 10,
the section of the second sub-waveguide is circular, the circle centers of a plurality of sections of the second sub-waveguide are positioned on the same straight line, and the section diameter of the second end of the second sub-waveguide is larger than that of the first end of the second sub-waveguide; the diameter of the cross section of the second sub-waveguide is larger along the transmission direction of the first optical signal, wherein the cross section of the second sub-waveguide is the cross section of the second sub-waveguide along the direction perpendicular to the transmission direction of the first optical signal.
12. The MT ferrule of claim 11,
the cross-sectional diameter of the second sub-waveguide becomes uniformly larger along the transmission direction of the first optical signal.
13. A single-mode optical fiber connector comprises a male connector and a female connector,
the male head and the female head both comprise an MT ferrule according to any one of claims 1 to 12, the MT ferrule of the male head is provided with a guide pin, the MT ferrule of the female head is provided with a guide hole, and the guide pin is inserted into the guide hole.
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| CN201510188577.4A CN104765105B (en) | 2015-04-20 | 2015-04-20 | Mechanical transfer MT lock pins and single-mode optical fiber connector |
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| CN201510188577.4A CN104765105B (en) | 2015-04-20 | 2015-04-20 | Mechanical transfer MT lock pins and single-mode optical fiber connector |
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| CN110618491A (en) * | 2019-04-28 | 2019-12-27 | 中航光电科技股份有限公司 | Optical cross interconnection assembly |
| CN110618502A (en) * | 2019-04-28 | 2019-12-27 | 中航光电科技股份有限公司 | Insert core component |
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| CN104765105B (en) | 2017-10-03 |
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