CN108152879B - kinds of multicore optical fiber with controllable crosstalk - Google Patents
kinds of multicore optical fiber with controllable crosstalk Download PDFInfo
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- CN108152879B CN108152879B CN201711326198.2A CN201711326198A CN108152879B CN 108152879 B CN108152879 B CN 108152879B CN 201711326198 A CN201711326198 A CN 201711326198A CN 108152879 B CN108152879 B CN 108152879B
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02042—Multicore optical fibres
Abstract
The invention discloses kinds of crosstalk-controllable multi-core optical fibers, which comprise a plurality of fiber core parts, a common cladding part and a coating part, and are characterized in that the fiber core parts comprise a pump optical fiber core and a transmission optical fiber core, the diameter of the pump optical fiber core is larger than that of the transmission optical fiber core, the position distribution of the pump optical fiber core and the transmission optical fiber core is asymmetric, the transmission optical fiber core comprises at least two transmission optical fiber cores, and the crosstalk of the multi-core optical fibers can be linearly regulated.
Description
Technical Field
The invention relates to the technical field of optical sensing, in particular to crosstalk-controllable multi-core optical fibers.
Background
The concept of multi-core single mode fiber was proposed by french telecommunications in 1994, which was designed and developed by alcatel corporation with french telecommunications. In the european optical communication conference in 2010, Space Division Multiplexing (SDM) technology based on multi-core fiber and few-mode fiber has been accepted by researchers of many organizations as a key technology for improving optical fiber communication systems, and is regarded as a second technical revolution of optical fiber transmission technology following the wavelength division multiplexing technology. According to the search, a plurality of batches of low-loss and low-crosstalk multi-core optical fibers are designed, drawn and tested internationally in a short period of several years, a plurality of low-loss and low-crosstalk multiplexers/demultiplexers are manufactured, and corresponding transmission experiments are conducted on international conferences such as an American optical fiber communication exhibition, a workshop (OFC), an European optical communication conference (ECOC) and the like for a plurality of times.
According to the mutual approaching degree of a plurality of groups of fiber cores in the multi-core fiber, the multi-core fiber develops two functions.
The fiber cores of the multiple groups are spaced greatly, and the center distance of the fiber cores is larger than 30.0 mu m, namely the structure does not generate optical coupling. The multi-core optical fiber can significantly improve the integration density per unit area of a transmission line. For example, the long-flying optical fiber cable member company in China draws homogeneous weak-coupling seven-core single-mode optical fibers in China through cooperation with the optical communication and optical network engineering research team of the university of science and technology in China. Through testing performance parameters such as optical fiber attenuation spectrum, cut-off wavelength, bending loss, crosstalk, chromatic dispersion, polarization mode chromatic dispersion and the like, the process is continuously optimized, and finally the seven-core optical fiber with low crosstalk and low loss is realized. The multi-core optical fiber attenuates about 0.20dB/km at 1550nm, has the crosstalk lower than-40 dB/100km, fills the technical blank in the field of the special optical fiber at home, and is close to numerous optical fiber manufacturers such as international leading OFS, Corning, rattan warehouse and the like in product performance.
The multi-core fiber design scheme is mainly aimed at improving the integration density of a unit area of a transmission line, different design schemes correspond to the optimization of parameters such as fiber attenuation spectrum, cut-off wavelength, bending loss, crosstalk, dispersion and polarization mode dispersion, and the multi-core fiber design with less crosstalk controllability is more important in numerous schemes.
Disclosure of Invention
In order to solve the problems, the invention provides crosstalk-controllable multi-core fibers, which comprise a plurality of fiber core portions, a shared cladding portion and a coating portion, wherein each fiber core portion comprises a pump fiber core and a transmission fiber core, the diameter of each pump fiber core is larger than that of each transmission fiber core, the positions of the pump fiber cores and the transmission fiber cores are distributed asymmetrically, each transmission fiber core comprises at least two transmission fiber cores, and crosstalk of the multi-core fibers can be regulated linearly.
Preferably, the diameter of the pump fiber core is in the range of 20.0-25.0 μm.
Preferably, the transmission fiber core comprises an th transmission fiber core and a second transmission fiber core, and the th transmission fiber core is located at a smaller central distance from the pump fiber core than the second transmission fiber core.
Preferably, the diameter of the transmission optical fiber core is in the range of 8.0-10.0 μm.
Preferably, the distance between the th transmission fiber core and the center of the pump fiber core is in the range of 38.0-65.0 μm.
Preferably, the distance between the center of the second transmission optical fiber core and the center of the pump optical fiber core is in the range of 68.0-95 μm.
Preferably, the center distance between the th transmission optical fiber core and the second transmission optical fiber core is in the range of 68.0-95 μm.
Preferably, the crosstalk value between the incident power of the pump fiber core and the th transmission fiber core satisfies the following linear relation:
C＝a×P-b，
wherein C represents the crosstalk value of the th transmission optical fiber core in dBm, P represents the incident power of the pump optical fiber core in dBm, a is 0.69-0.79, and b is 35-40.
Preferably, the pump fiber core is used for transmitting high-power pump light energy, and the transmission fiber core is used for transmitting optical communication signals.
Preferably, the pump optical fiber core and the transmission optical fiber core each comprise a core and a cladding.
The invention has the beneficial effects that:
the invention provides kinds of crosstalk-controllable multi-core optical fibers, which can change and control the optical wave coupling effect generated between fiber cores by controlling the incident light power in the core of a pump optical fiber, so that the multi-core optical fiber has the crosstalk-controllable characteristic, and the limit of the core diameter of the optical fiber core and the allowable error of the distance between adjacent fiber cores is greatly reduced.
Drawings
Fig. 1 is a cross-sectional schematic view of a crosstalk-controllable multi-core optical fiber of the present invention.
Fig. 2 is a diameter dimension chart of various fiber cores in the crosstalk controllable multi-core fiber of the present invention, wherein the multi-core fiber diameter D1, the pump fiber core diameter D2, and the transmission fiber core diameter D3.
Fig. 3 is a diagram illustrating center distances between various optical fiber cores in the crosstalk-controllable multi-core optical fiber of the present invention, where a distance between a pump optical fiber core and an th transmission optical fiber core is L1, a distance between a pump optical fiber core and a second transmission optical fiber core is L2, and a center distance between a th transmission optical fiber core and a second transmission optical fiber core is L3.
Fig. 4 is a graph of incident optical power in the pump fiber core versus crosstalk in the transmission fiber core of the present invention, where "triangle" represents crosstalk in the th transmission fiber core that is closer to the pump fiber core, the solid line represents its fitted curve, "circle" represents crosstalk in the second transmission fiber core that is farther from the pump fiber core, and the dotted line represents its fitted curve.
Detailed Description
The following detailed description of the invention, given in connection with the drawings , is not intended to limit the invention to the particular form set forth, but is to be construed as being illustrative and not limiting.
Example 1
Referring to fig. 1 to 4, the present invention provides kinds of crosstalk-controllable multi-core optical fibers including a plurality of core portions, a common cladding portion 1, and a coating portion, wherein the core portions include pump fiber cores 2 and transmission fiber cores having different sizes, the pump fiber cores 2 are for transmitting high-power pump light energy, the transmission fiber cores are for transmitting optical communication signals, the pump fiber cores 2 and the transmission fiber cores each include a core and a cladding and each extend along a central axis of the multi-core optical fiber, and the common cladding portion physically holds the core portions therein in a state where the pump fiber cores 2 and the transmission fiber cores are spaced apart from each other.
Specifically, the multi-core optical fiber comprises a pumping optical fiber core 2 and a transmission optical fiber core, wherein the diameters of the fiber cores of the two optical fiber cores are different, and the position arrangement and distribution of the two optical fiber cores are asymmetric and are approximately triangular; the diameter D2 of the pump optical fiber core 2 is within the range of 20.0-25.0 μm, and the diameter D3 of the transmission optical fiber core is within the range of 8.0-10.0 μm; the transmission fiber core includes at least two.
The transmission optical fiber core comprises a th transmission optical fiber core 3 and a second transmission optical fiber core 4, the th transmission optical fiber core 3 is closer to the pump optical fiber core 2 than the second transmission optical fiber core 4, the central distance L1 between the th transmission optical fiber core 3 and the pump optical fiber core 2 is within the range of 38.0-65.0 μm in steps, the central distance L2 between the second transmission optical fiber core 4 and the pump optical fiber core 2 is within the range of 68.0-95.0 μm, and the central distance L3 between the th transmission optical fiber core 3 and the second transmission optical fiber core 4 is within the range of 68.0-95.0 μm.
In the present embodiment, the diameter D1 of the multi-core optical fiber is preferably 125.0 μm, wherein the diameter of the pump optical fiber core 2 is 20.0 μm, the diameters of the th transmission optical fiber core 3 and the second transmission optical fiber core 4 are equal and 8.0 μm, the distance L1 between the centers of the pump optical fiber core 2 and the th transmission optical fiber core 3 is 38.0 μm, the distance L2 between the centers of the pump optical fiber core 2 and the second transmission optical fiber core 4 is 78.0 μm, and the distance L3 between the centers of the th transmission optical fiber core 3 and the second transmission optical fiber core 4 is 78.0 μm.
In order to verify that the incident light power in the core of the pump fiber is controlled, the multi-core fiber of the present invention can generate tunable optical coupling effect and has the crosstalk controllable characteristic, the following experiment was performed.
Preparing a multi-core fiber A, a multi-core fiber B, a multi-core fiber C, a multi-core fiber D, a multi-core fiber E, a multi-core fiber F and a multi-core fiber G (the specific dimensions are shown in the following table, wherein the diameters D1 of the multi-core fibers are all 125.0 mu m), gradually increasing the incident light power in the pump fiber core from 0 to 35dBm by adjusting the output power of a pump laser, and measuring the crosstalk value of each transmission fiber core.
It is found that crosstalk in the range of-40 dB/100km to-12 dB/100km is obtained in the th transmission fiber core closer to the pump fiber core and varies approximately linearly, while crosstalk is not significantly changed in the second transmission fiber core farther from the pump fiber core and is maintained at about-40 dB/100km, as shown in fig. 4.
According to the measured values, the incident power of the pump fiber core and the crosstalk value of the th transmission fiber core satisfy the following linear relation:
C＝a×P-b，
wherein C represents the crosstalk value of the th transmission optical fiber core in dBm, P represents the incident power of the pump optical fiber core in dBm, a is 0.69-0.79, and b is 35-40.
Therefore, the crosstalk difference between the th transmission fiber core and the second transmission fiber core can be linearly tuned by changing the incident light power in the pumping fiber core.
It should be noted that the multi-core fiber of the present invention is suitable for preparing a novel fiber sensor in national defense, industrial production and civil fields, especially for those applications of systems that need to introduce controllable crosstalk, including variations in amplitude, phase, etc., on different optical transmission paths, such as a photoelectric oscillator, a microwave photonic filter, an optical delay line, etc.
The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed in the present invention should be covered within the protection scope of the present invention.
Claims (7)
- A multi-core optical fiber includes a plurality of core portions, a common cladding portion and a coating portion, wherein the core portions include a pump optical fiber core and a transmission optical fiber core, the diameter of the pump optical fiber core is larger than that of the transmission optical fiber core, the positions of the pump optical fiber core and the transmission optical fiber core are asymmetrically distributed, the transmission optical fiber core includes at least two transmission optical fiber cores, crosstalk of the multi-core optical fiber can be linearly controlled, wherein,the diameter of the pump optical fiber core is within the range of 20.0-25.0 μm;the transmission fiber core comprises th transmission fiber core and a second transmission fiber core, the th transmission fiber core is closer to the center of the pump fiber core than the second transmission fiber core is to the center of the pump fiber core;the incident power of the pump fiber core and the crosstalk value of the th transmission fiber core satisfy the following linear relation:C＝a×P-b，wherein C represents the crosstalk value of the th transmission optical fiber core in dBm, P represents the incident power of the pump optical fiber core in dBm, a is 0.69-0.79, and b is 35-40.
- 2. The multicore optical fiber of claim 1, wherein the transmission fiber core has a diameter in the range of 8.0 to 10.0 μm.
- 3. The multicore optical fiber of claim 1, wherein the th transmission fiber core is located at a center distance of 38.0 μm to 65.0 μm from the pump fiber core.
- 4. The multi-core optical fiber as claimed in claim 1, wherein the second transmission fiber core is located at a center distance from the pump fiber core in a range of 68.0 μm to 95 μm.
- 5. The multicore optical fiber of claim 2, wherein the th transmission fiber core is located at a center distance from the second transmission fiber core in the range of 68.0 μm to 95 μm.
- 6. The multi-core optical fiber as claimed in claim 1, wherein the pump fiber core is configured to transmit high power pump light energy and the transmission fiber core is configured to transmit optical communication signals.
- 7. The multicore optical fiber of claim 1, wherein the pump optical fiber core and the transmission optical fiber core each comprise a core and a cladding.
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| CN108957626B (en) * | 2018-06-19 | 2020-09-08 | 全球能源互联网研究院有限公司 | Feedback energy transmission optical fiber and optical fiber energy transmission system and device |
| CN113660039A (en) * | 2021-08-17 | 2021-11-16 | 广东工业大学 | Programmable controlled multi-dimensional multiplexing microwave photon filter and filtering method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101876774A (en) * | 2009-11-27 | 2010-11-03 | 北京交通大学 | Large-power multiband multi-core optical fiber amplifier |
| US8811787B2 (en) * | 2011-11-30 | 2014-08-19 | At&T Intellectual Property I, L.P. | Multicore optical fiber with reduced inter-core crosstalk |
| CN107132610A (en) * | 2016-02-29 | 2017-09-05 | 株式会社藤仓 | Multi-core fiber |
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| US8320769B2 (en) * | 2009-06-26 | 2012-11-27 | Alcatel Lucent | Transverse-mode multiplexing for optical communication systems |
| JP2013020074A (en) * | 2011-07-11 | 2013-01-31 | Hitachi Cable Ltd | Multi-core fiber |
| JP6138481B2 (en) * | 2012-12-25 | 2017-05-31 | 株式会社フジクラ | Multi-core fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101876774A (en) * | 2009-11-27 | 2010-11-03 | 北京交通大学 | Large-power multiband multi-core optical fiber amplifier |
| US8811787B2 (en) * | 2011-11-30 | 2014-08-19 | At&T Intellectual Property I, L.P. | Multicore optical fiber with reduced inter-core crosstalk |
| CN107132610A (en) * | 2016-02-29 | 2017-09-05 | 株式会社藤仓 | Multi-core fiber |
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