CN113740968A - Low-loss ring core few-mode multiplexer - Google Patents
Low-loss ring core few-mode multiplexer Download PDFInfo
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- CN113740968A CN113740968A CN202010464753.3A CN202010464753A CN113740968A CN 113740968 A CN113740968 A CN 113740968A CN 202010464753 A CN202010464753 A CN 202010464753A CN 113740968 A CN113740968 A CN 113740968A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 claims description 25
- 239000013307 optical fiber Substances 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 19
- 230000008878 coupling Effects 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 101100477784 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SMF2 gene Proteins 0.000 claims description 15
- 101150102131 smf-1 gene Proteins 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 4
- 101000962053 Homo sapiens Pyrin Proteins 0.000 claims description 3
- 238000005253 cladding Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 13
- 238000011160 research Methods 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000010365 information processing Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000004088 simulation 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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
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- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention provides a low-loss ring core few-mode (de) multiplexer; a pure silicon dioxide material ring core channel is adopted, so that the loss is effectively reduced; the mode crosstalk is effectively reduced by adopting large refractive index difference; the three-mode multiplexing and demultiplexing operation of the ring-core few-mode (demultiplexing) multiplexer is realized.
Description
Technical Field
The invention relates to a low-loss ring core few-mode (de) multiplexer which can be applied to the fields of fiber optics, fiber communication, fiber wireless access, optical information processing, new-generation information technology and the like.
Background
In recent years, the traffic volume of various communications has increased exponentially, and single-mode fiber communications have been challenged unprecedentedly. The fiber optic communications industry has surrounded space division multiplexing (including core multiplexing and mode division multiplexing and combinations thereof)The physical dimension realizes breakthrough on the transmission capacity of the communication network; multicore fibers and few-mode fibers in Space division multiplexing and related devices and application research become leading-edge research hotspots [ Guifang Li, New Bai, and Ningbo Zhao and Cen Xia, Space-division multiplexing: the next front in optical communications& Photonics, 2014, 6(4): 5041-5046；Guifang Li, Magnus Karlsson, Xiang Liu, and Yves Quiquempois, Focus issue introduction: space-division multiplexing, Opt. Express 2014, 22, 32526-32527; He Wen, Hongjun Zheng et al. Few-mode fibre-optic microwave photonic links [J]Light, Science and Applications 2017, 6, 8, zheng hong, li xin, baicheng forest, transmission of chirped pulses in optical fiber, beijing: scientific publishers, 2018, 1-184; dongqiu Huan, Liuyang, Zhenghongjunli, Baichengling, Hu Sheng, etc., lesser modulo multiplexing (demultiplexing) technical research in modulo division multiplexing system [ J]The university newspaper of chat (Nature science edition), 2020, 33(2): 50-67; wang Xiagui, Zheng hong Jun (Communicator), Li Xin, Liuyang, wish, Baicheng forest, Hu sanitary, development of optical fiber research in Modal division multiplexing system, Chun university journal (Nature science edition), 2019.4, 32(2): 69-79](ii) a A ring core few-mode optical fiber is also concerned by people; the Ring-Core Few-Mode Fiber only supports a single radial Mode, and has a large refractive index difference between modes [ Yongmin Jung, Qiongyue Kang, Hongyan Zhou, Rui Zhang, Su Chen, Honghai Wang, Yuche Yang, Xianqing Jin, Frank P. Payne, Shaif-ul Alam, and David J. Richardson, 'Low-Loss 25.3 km Few-Mode Ring-Core Fiber for Mode-Division multiplex Transmission,' J. light technique 35, 1363-](ii) a Effective Refractive Index Difference (ERID) of less-mode fiber in different modes is greater than 0.5x10-3Mode coupling can be avoided (Pierre Sillard et al Few-Mode Fibers for Space-Division Multiplexed Transmissions [ J], European Conference &Inhibition on Optical Communication, 2013.03 (A1): 1-3; Roland Ryf. Switching and Multiplexing Technologies for Mode-Division Multiplexed Networks, Optical Fiber Communication reference & exposure, 2017, Tu2 c); pure silica core can effectively reduce lightFiber attenuation and fusion loss are currently mostly applied to single-mode optical fibers (T. Hasegawa et al, 2016. Advances in ultra-low-loss silica fibers [ J. ]]. Frontiers in Optics, paper FTu2B.2; S. Ten. 2016. Ultra Low-loss Optical Fiber Technology[J]. Optical Fiber Communication Conference, paper Th4E.5; Yoshiaki Tamura. 2018. Ultra-low loss silica core fiber for long haul transmission [J]Optical Fiber Communication Conference, paper M4 B.1). Mode division multiplexing research based on few-mode optical fibers becomes one of the research hotspots in recent years; the few-mode division multiplexer becomes one of key devices for mode division multiplexing transmission, and the research of the few-mode division multiplexer is widely concerned. Coupled Mode theory [ John D, Love and Nicolas Riesen, "Mode-selective couplers for now-Mode optical fiber networks," Opt, Lett. 37, 3990-]And numerical simulation of the Beam Propagation Method (BPM) [ John D. Love and Nicolas Riesen, "Mode-selective couplers for now-Mode optical fiber networks," Opt. Lett. 37, 3990-; t, Joseph and J. John, "Two-core fiber based mode converter and mode multiplexer," Journal of optical Society of America B, vol.36, No.8, pp. 1987-; t, Joseph and J. John, "thermal expanded multicore-fiber-based mode multiplexer/demultiplexer," Journal of optical Society of America B, vol.36, No.12, pp. 3499-3504, Dec.2019]All in agreement with experimental demonstrations of inter-core Mode multiplexers and demultiplexers using the directional coupling method [ h. Uemura, y. Sasaki, s. Nishimoto, t. Uematsu, k. Takenaga, k. Omichi, r. Goto, s. Matsuo, k. Saitoh, "Mode multiplexer/demultiplexer based on a partial electrically connected multi-core fiber," in proceedings of optical fiber communication 2014, paper. Tu 3D; s, Gross, N, Riesen, J.D. Love, and M.J. Withford, "Three-dimensional ultra-
broad band integrated taped mode multiplexers ", Laser & Photonics Reviews, vol.8, No. 5, pp. L81-L85, Sep.2014 ]. The mode multiplexing and demultiplexing of these two-core and three-core Mode Selective Couplers (MSCs) employ a directional coupling method. Research has shown that mode multiplexing and demultiplexing are feasible using a directional coupling approach.
In summary, the concept of pure silica fiber core and ring core refractive index distribution few-mode optical fiber is organically fused, a directional coupling method is adopted, and a novel few-mode (de) multiplexer is provided, so that the problem of research challenge of the existing few-mode optical fiber transmission is hopefully solved, and the novel few-mode (de) multiplexer has important academic value and application value, great research significance and wide application prospect.
Disclosure of Invention
Under the support of special expenses of construction engineering of national science foundation (serial numbers 61671227 and 61431009), Shandong province science foundation (ZR 2011FM 015) and Taishan scholars, the invention provides a low-loss ring core less-mode multiplexer, which adopts the proposed ring core main transmission channel and adopts single-mode channels as two adjacent coupling channels; according to the reversible principle of light, the multiplexer is used reversely, and then the demultiplexing function is achieved. The (de) multiplexer combines the advantages of pure silica fiber core and ring core refractive index distribution few-mode fiber core, and provides important support for the deep research in the fields of fiber optics, fiber communication, fiber wireless access, optical information processing, new generation information technology and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a low-loss ring core few-mode multiplexer; the method is characterized in that: the few-mode ring core channel FMF is the main transmission channel of the few-mode (de) multiplexer; single mode cores SMF1 and SMF2 as coupling channels, placed on the X and Y axes, respectively; the mode LP01 is respectively incident from the left ends of FMF, SMF2 and SMF1, and is in transmission coupling multiplexing along the Z direction; LP11a and LP11b will be coupled from SMF2 and SMF1, respectively, into FMF, realizing 3 modes of mode division multiplexing; if 3 modes are all incident from the FMF, LP11a and LP11b are coupled from the FMF into SMF2 and SMF1, respectively, then mode demultiplexing of the 3 modes is achieved; according to the relationship between the coupling length of each mode and the channel spacing, the initial center-to-center channel spacing of FMF and SMF1 is 14 μm, and the channel periphery spacing is 4 μm; the distance between FMF and SMF2 is the same as the former; the length of each channel is 2640 μm; the condition of the main transmission channel of the few-mode (de) multiplexer is as follows, when r is less than 1.5 mu m, the fiber core adopts fluorine-doped silicon dioxide material, and the refractive index is 1.4350; when r is more than or equal to 1.5 mu m and less than or equal to 5 mu m, the fiber core is made of pure silicon dioxide material, and the refractive index is 1.4440; when r is more than 5 mu m, the optical fiber cladding adopts fluorine-doped silicon dioxide material, and the refractive index is 1.4350; the single-mode coupling channel radius is r =5 μm; in the whole C wave band, the intrinsic loss of two modes of the main transmission channel of the ring-core few-mode (de) multiplexer is small and is less than 0.156 dB/km; a pure silicon dioxide material ring core transmission channel is adopted, so that the loss is effectively reduced; and by adopting large refractive index difference, the mode crosstalk is effectively reduced, and the performance of the few-mode (de) multiplexer is further improved.
The invention has the following beneficial effects:
1. a pure silicon dioxide material ring core transmission channel is adopted, so that the loss is effectively reduced;
2. by adopting large refractive index difference between modes, the mode crosstalk is effectively reduced;
3. the optical fiber integrates the advantages of a pure silicon dioxide channel and a ring core channel, so that the performance of the few-mode (de) multiplexer is further improved, and important support is provided for the deep research in the fields of optical fiber optics, optical fiber communication, optical fiber wireless access and optical information processing, new-generation information technology and the like.
Drawings
FIG. 1 is a schematic diagram of a low loss ring core few-mode (de) multiplexer
Fig. 2 is a ring core refractive index profile of a few-mode (de) multiplexer main transmission channel.
Fig. 3 is a graph of the two-mode intrinsic loss of a low-loss ring core few-mode (de) multiplexer main transmission channel.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
Example 1
Fig. 1 is a schematic diagram of a low loss ring core few-mode (de) multiplexer structure. And respectively arranging two mode channels of the same mode group of the (de) multiplexer in an XZ plane and a YZ plane, and forming the three-dimensional directional coupling type multiplexer and the de-multiplexer by the two mode channels of the same mode group and the main channel. The few-mode ring core channel FMF is a main transmission channel of a mode division multiplexer and a demultiplexer, and single-mode coupling channels SMF1 and SMF2 are respectively placed on an X axis and a Y axis; the mode LP01 is respectively incident from the left ends of FMF, SMF2 and SMF1, and is in transmission coupling multiplexing along the Z direction; LP11a and LP11b would couple from SMF2 and SMF1, respectively, into FMF, enabling 3-mode division multiplexing. If 3 modes are all incident from the FMF, LP11a and LP11b are coupled from the FMF into SMF2 and SMF1, respectively, then mode demultiplexing of the 3 modes is achieved. The initial center-to-center channel spacing of FMF and SMF1 was 14 μm, the channel perimeter spacing was 4 μm, and the distance between FMF and SMF2 was the same as the former, depending on the coupling length of each mode versus the channel spacing. The length of each channel is 2640 μm.
FIG. 2 is a ring core refractive index profile of a few-mode (de) multiplexer main transmission channel; as can be seen from fig. 2, when r is less than 1.5 μm, the channel is made of fluorine-doped silica material and has a refractive index of 1.4350; when r is more than or equal to 1.5 mu m and less than or equal to 5 mu m, pure silicon dioxide material is adopted, and the refractive index is 1.4440; when r is more than 5 mu m, the cladding layer is made of fluorine-doped silicon dioxide material, and the refractive index is 1.4350; and a pure silicon dioxide material ring core channel is adopted, so that the channel loss is effectively reduced. Both single-mode coupling channels have a radius of r =5 μm.
FIG. 3 is a graph of the two-mode intrinsic loss of the main transmission channel of a low-loss ringed-core few-mode (de) multiplexer, which can be seen to reach the lowest value at a wavelength of 1.54 μm, when the intrinsic losses of the LP01 mode and the LP11 mode are 0.149dB/km and 0.151dB/km, respectively; when the wavelength is less than 1.54 μm, the intrinsic loss of the two modes increases as the wavelength becomes smaller; when the wavelength is greater than 1.54 μm, the intrinsic loss of the two modes increases as the wavelength becomes larger; the intrinsic loss of the two modes is small and is less than 0.156 dB/km in the whole C band.
In summary, the proposed fiber achieves low loss, low crosstalk ring-core two mode operation. It should be noted that the specific embodiments are merely representative examples of the present invention, and it is obvious that the technical solution of the present invention is not limited to the above examples, and many variations are possible. Those skilled in the art, having the benefit of this disclosure and the benefit of this written description, will appreciate that other embodiments can be devised which do not depart from the specific details disclosed herein.
Claims (1)
1. A low loss ring core few-mode multiplexer; the method is characterized in that: the few-mode ring core channel FMF is the main transmission channel of the few-mode (de) multiplexer; single mode cores SMF1 and SMF2 as coupling channels, placed on the X and Y axes, respectively; the mode LP01 is respectively incident from the left ends of FMF, SMF2 and SMF1, and is in transmission coupling multiplexing along the Z direction; LP11a and LP11b will be coupled from SMF2 and SMF1, respectively, into FMF, realizing 3 modes of mode division multiplexing; if 3 modes are all incident from the FMF, LP11a and LP11b are coupled from the FMF into SMF2 and SMF1, respectively, then mode demultiplexing of the 3 modes is achieved; according to the relationship between the coupling length of each mode and the channel spacing, the initial center-to-center channel spacing of FMF and SMF1 is 14 μm, and the channel periphery spacing is 4 μm; the distance between FMF and SMF2 is the same as the former; the length of each channel is 2640 μm; the condition of the main transmission channel of the few-mode (de) multiplexer is as follows, when r is less than 1.5 mu m, the fiber core adopts fluorine-doped silicon dioxide material, and the refractive index is 1.4350; when r is more than or equal to 1.5 mu m and less than or equal to 5 mu m, the fiber core is made of pure silicon dioxide material, and the refractive index is 1.4440; when r is more than 5 mu m, the optical fiber cladding adopts fluorine-doped silicon dioxide material, and the refractive index is 1.4350; the single-mode coupling channel radius is r =5 μm; in the whole C wave band, the intrinsic loss of two modes of the main transmission channel of the ring-core few-mode (de) multiplexer is small and is less than 0.156 dB/km; a pure silicon dioxide material ring core transmission channel is adopted, so that the loss is effectively reduced; and by adopting large refractive index difference, the mode crosstalk is effectively reduced, and the performance of the few-mode (de) multiplexer is further improved.
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