CN104460178A - Four-line polarization mode signal light online erbium-doped optical fiber amplifier and running method thereof - Google Patents
Four-line polarization mode signal light online erbium-doped optical fiber amplifier and running method thereof Download PDFInfo
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- CN104460178A CN104460178A CN201410784211.9A CN201410784211A CN104460178A CN 104460178 A CN104460178 A CN 104460178A CN 201410784211 A CN201410784211 A CN 201410784211A CN 104460178 A CN104460178 A CN 104460178A
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- 239000013307 optical fiber Substances 0.000 title abstract description 17
- 230000010287 polarization Effects 0.000 title abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 218
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 40
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 22
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- 239000002019 doping agent Substances 0.000 description 3
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/395—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves in optical waveguides
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Abstract
The invention discloses a four-line polarization mode signal light online erbium-doped optical fiber amplifier and a running method thereof. The amplifier comprises a first mode multiplexing module, a first erbium-doped optical fiber, a second erbium-doped optical fiber and a second mode multiplexing module, fiber core erbium particles of the first erbium-doped optical fiber are doped annularly, a fiber core of the second erbium-doped optical fiber is doped centrally, and four-line polarization mode signal light and LP11 mode pumping light generated by a first pumping module are injected into the first erbium-doped optical fiber through the first mode multiplexing module. The running method includes that the pumping light and the signal light are subjected to beam combination and enter the first erbium-doped optical fiber, and centrifugal mode signal light acquires high optical gain; the pumping light and the signal light enter the second erbium-doped optical fiber, and central mode signal light acquires high optical gain; remaining pumping light is filtered, and amplified four-line polarization mode signal light is output. By the amplifier and the running method, the process for preparing erbium-doped optical fibers through a chemical vapor disposition method is simplified, only the LP11 mode pumping light is needed while the four-line polarization mode signal light is amplified, and centrifugal mode signal light gain and central mode signal light gain can be controlled respectively.
Description
Technical field
The present invention relates to optical communication technique, specifically the online Erbium-Doped Fiber Amplifier (EDFA) of a kind of four linearly polarized mode flashlight and operation method.
Background technology
In recent years, single mode fiber communications is subject to the restrictions such as optical fiber unintentional nonlinearity and magnification method, and its capacity approaches shannon limit.For satisfied following high capacity communication demand, still unemployed optical fiber space degree of freedom becomes current new focus.When front mould divides multiplexing (MDM) by extensive concern, it is one of important research direction likely breaking through optical fiber shannon limit.According to information theory, in less fundamental mode optical fibre, each pattern can be used as an independently transmission channel; If the transport propertys such as non-linear, the noise of pattern and single-mode fiber can be compared, then mould divides multiplexing MDM capacity to be directly proportional to mode multiplexing quantity.The MDM that the multiplexer mode of current report is maximum is front four the lowest-order linearly polarized modes of less fundamental mode optical fibre, i.e. basic mode LP
01, high-order mode LP
11, LP
21and LP
02mould.2013, the multiplexing MDM system of four moulds of U.S.'s Bell Laboratory report achieved the spectrum transmissions efficiency up to 32bit/s/Hz.This experiment adopts multiple general single mode Erbium-Doped Fiber Amplifier (EDFA) to amplify different mode flashlight, and due to the restriction of pattern related gain, its maximum transmission distance is only 177km.The online Erbium-Doped Fiber Amplifier (EDFA) of high-performance with few mould enlarging function is still one of important photonic device realizing remote, practical MDM system.Result of study shows, the amplifier mode gain unbalanced (i.e. pattern related gain) produced by different spaces mode field distributional difference is the key element affecting the lifting of MDM power system capacity; And after multiplexing line polarization mode is more than two, the pattern related gain of less fundamental mode optical fibre amplifier is extremely difficult to be controlled.2014, University of Southampton scholar proposed LP
21mould two directional pump merges complicated fibre core erbium particle doping design proposal, controls the Erbium-Doped Fiber Amplifier (EDFA) pattern related gain that inclined for support four line mould flashlight amplifies at about 2dB.But support that the Erbium-Doped Fiber Amplifier (EDFA) modal gain control program that four linearly polarized mode flashlights amplify requires that Er-doped fiber fibre core has complicated erbium particle doping design at present, segmentation scheme also needs to adopt High-Order Pump pattern (as LP simultaneously
41mould).These scheme Problems existing are: be difficult to based on improvement chemical vapour deposition technique the Er-doped fiber preparing somewhat complex design like this; High-Order Pump mode transfer is unstable; Realize four linearly polarized mode flashlight gains based on same Er-doped fiber to control, due to modal gain competitive influence, the dynamic adjustable extent of each modal gain is limited, is unfavorable for the pattern dependent loss etc. overcome in MDM transmitting procedure.
Summary of the invention
The object of the invention is the online Erbium-Doped Fiber Amplifier (EDFA) of a kind of four linearly polarized mode flashlight of design, comprise the first mode Multiplexing module, the first Er-doped fiber, the second Er-doped fiber and the second mode multiplexing module that are linked in sequence, the fibre core erbium particle of the first Er-doped fiber is annular doping, adulterate centered by second Er-doped fiber fibre core erbium particle, make model centrifuge flashlight and center mode flashlight can obtain gain respectively in the first Er-doped fiber and the second Er-doped fiber.
Another object of the present invention is to the operation method providing the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlights, in four linearly polarized mode flashlights of input, model centrifuge flashlight and center mode flashlight obtain gain respectively in the first Er-doped fiber and the second Er-doped fiber.
The online Erbium-Doped Fiber Amplifier (EDFA) of one four linearly polarized mode flashlight of the present invention's design, comprise mode multiplexing module and Er-doped fiber, be specially first mode Multiplexing module, the first Er-doped fiber, the second Er-doped fiber be connected with the second mode multiplexing sequence of modules, the fibre core erbium particle of the first Er-doped fiber is annular doping, and the internal diameter of doping ring is 2r
1, doping ring external diameter be Er-doped fiber core diameter, adulterate centered by the second Er-doped fiber fibre core erbium particle, Doping Center external diameter is 2r
2.The fiber core radius of described first Er-doped fiber and the second Er-doped fiber is a=4.67 μm ~ 12.8 μm, r
1=(0.45 ~ 0.75) a, r
2=(0.25 ~ 0.65) a.The length L of described first Er-doped fiber
1=1.0 ~ 4.5m, the length L of the second Er-doped fiber
2=1.5 ~ 6.5m.The numerical aperture of described first Er-doped fiber and the second Er-doped fiber is NA=0.10 ~ 0.20.The core diameter relative different of described first Er-doped fiber and the second Er-doped fiber is no more than 10%.The fiber core refractive index relative different of described first Er-doped fiber and the second Er-doped fiber is less than 5%.
First pump module is connected with described first mode Multiplexing module, and the first pump module is forward pumping module, and it produces LP
11mould pump light.
Described first mode Multiplexing module is made up of the first lens A, the double-tone spectroscope A that sequentially install and the second lens A, wherein double-tone spectroscope A reflected pump light, transmission four linearly polarized mode flashlight, the minute surface of double-tone spectroscope A becomes miter angle with the axis of the first lens A, the second lens A.Described second mode multiplexing module is made up of the first lens B, the double-tone spectroscope B that sequentially install and the second lens B, double-tone spectroscope B reflected pump light wherein, transmission four linearly polarized mode flashlight, the axes normal of the minute surface of double-tone spectroscope B and the first lens B, the second lens B.
Between described first Er-doped fiber and the second Er-doped fiber, welding is continuous.
Described Erbium-Doped Fiber Amplifier (EDFA) also can have the second pump module and described second mode multiplexing model calling.Second pump module is backward pump module, produces LP
11mould pump light.The minute surface of the double-tone spectroscope B of the second mode multiplexing module becomes 135 degree of angles with the axis of first, second lens B.The LP that second pump module produces
11mould pump light enters second Er-doped fiber to reflection in the other direction, the first lens B after converging through the double-tone spectroscope B of the second mode multiplexing module, implements to amplify to four linearly polarized mode flashlights.
The operation method of the online Erbium-Doped Fiber Amplifier (EDFA) of a kind of four linearly polarized mode flashlight of the present invention's design is as follows:
I, four linearly polarized mode flashlight and LP
11mould pump light input first mode Multiplexing module.Four linearly polarized mode flashlights contain model centrifuge flashlight and center mode flashlight, model centrifuge flashlight and LP
11mould flashlight and LP
21mould flashlight, center mode flashlight and LP
01mould flashlight and LP
02mould flashlight.Four linearly polarized mode flashlights of input converge through the first lens A of described first mode Multiplexing module, the LP of the first pump module input
11mould pump light is reflected by double-tone spectroscope A, with the four linearly polarized mode signal combiners converged, then be coupled into the first Er-doped fiber through the second lens A.
II, LP
11mould pump light amplifies four linearly polarized mode flashlights in the first Er-doped fiber.
The optical gain of different mode flashlight depends primarily on three factors, i.e. mode distributions and fibre core erbium particle dopant profiles in mode distributions, pump light fiber core cross section in flashlight fiber core cross section; Three's space overlap degree is higher, and this mode signal gain of light is larger.
The fibre core erbium particle of the first Er-doped fiber is annular doping, model centrifuge flashlight, i.e. LP in the first Er-doped fiber
11mould flashlight and LP
21mould flashlight, with LP
11mould pump light, the fibre core erbium distribution of particles space overlap factor are large, therefore LP
11mould flashlight and LP
21mould flashlight obtains larger optical gain, LP
11mould flashlight and LP
21the gain that mould flashlight obtains in the first Er-doped fiber is by the first Er-doped fiber length L
1with the internal diameter 2r of fibre core erbium particle doping ring
1determine; And center mode flashlight, i.e. LP
01mould flashlight and LP
02mould flashlight, with LP in the first Er-doped fiber
11mould pump light, the fibre core erbium distribution of particles space overlap factor are low, LP
01mould and LP
02mould flashlight obtains optical gain at the first Er-doped fiber and is only LP
11mould and LP
2143% ~ 55% of the optical gain that mould flashlight obtains.
LP
01mould and LP
02mould flashlight in the first Er-doped fiber with LP
11the space overlap factor relative different of mould pump light, fibre core erbium distribution of particles is less than 10%, therefore LP
01mould and LP
02the optical gain relative different that mould flashlight obtains at the first Er-doped fiber is less than 10%.
III, after the first Er-doped fiber, remaining LP
11mould pump light and the four linearly polarized mode flashlights be amplified enter the second Er-doped fiber jointly.Adulterate centered by second Er-doped fiber, center mode flashlight, i.e. LP in the second Er-doped fiber
01mould flashlight and LP
02mould flashlight, with LP
11mould pump light, the fibre core erbium distribution of particles space overlap factor are large, therefore LP
01mould flashlight and LP
02mould flashlight obtains larger optical gain, LP
01mould flashlight and LP
02the gain that mould flashlight obtains in the second Er-doped fiber is by the second Er-doped fiber length L
2with fibre core erbium particle centre doping external diameter 2r
2determine; And model centrifuge flashlight, i.e. LP
11mould flashlight and LP
21mould flashlight, with LP in the second Er-doped fiber
11mould pump light, the fibre core erbium distribution of particles space overlap factor are extremely low, and it is minimum that institute obtains optical gain.
IV, after the second Er-doped fiber, four linearly polarized mode flashlights of amplification and remaining LP
11mould pump light sends into the second mode multiplexing module, through the first lens B convergence, the remaining LP of double-tone spectroscope B filtering
11mould pump light, then four linearly polarized mode flashlights of the amplification that is coupled by the second lens B, exports.
The LP of the first pump module input in described step I
11mould pumping light power is greater than 100mW.
Described Erbium-Doped Fiber Amplifier (EDFA) also has the second pump module and described second mode multiplexing model calling.Second pump module is backward pump module, produces LP
11mould pump light.The minute surface of the double-tone spectroscope B of the second mode multiplexing module becomes 135 degree of angles with the axis of first, second lens B.In described step III, through the LP of the second mode multiplexing module input
11mould pump light, is implemented to amplify to reflecting in the other direction, entering the second Er-doped fiber after the first lens B of the second mode multiplexing module converging to four linearly polarized mode flashlights by double-tone spectroscope B.
The LP of described second pump module input
11mould pumping light power is greater than 50mW.
Compared with prior art, the advantage of the online Erbium-Doped Fiber Amplifier (EDFA) of the present invention four linearly polarized mode flashlight and operation method is: 1, make use of different mode flashlight and have different mode distributions feature, the two sections of Er-doped fiber cascades cleverly fibre core erbium particle being respectively annular doping and center doping form four linearly polarized mode flashlight amplifiers, model centrifuge flashlight realizes effectively amplifying by Er-doped fiber fibre core erbium particle annular doping, and center mode is then obtained by core centre doping and amplifies; Two sections of Er-doped fiber cascades of simply adulterating form four linearly polarized mode Erbium-Doped Fiber Amplifier (EDFA)s, and without the need to using the complicated Er-doped fiber that many rings adulterate and multistage doped in concentrations profiled designs, the technique that chemical vapour deposition technique prepares Er-doped fiber can simplify greatly; 2, only low-order mode pump light need be taked can to amplify four linearly polarized mode flashlights simultaneously, avoid the high-order mode pump light using transmission unstable; 3, in four linearly polarized mode flashlights, model centrifuge flashlight and center mode flashlight obtain gain respectively in the first Er-doped fiber and the second Er-doped fiber, as long as adjust first, second Er-doped fiber length and erbium particle doping diameter, the independent gain and the pattern related gain thereof that control two kinds of mode signal light can be facilitated; Overcome the impact that model centrifuge and center mode gain competition control modal gain, the optical gain of two kinds of mode signal light all has larger adjustable extent.
Accompanying drawing explanation
Fig. 1 is the structural representation of the online Erbium-Doped Fiber Amplifier (EDFA) embodiment 1 of this four linearly polarized mode flashlight;
Fig. 2 is the first Er-doped fiber fibre core erbium particle dopant profiles schematic diagram in Fig. 1;
Fig. 3 is the second Er-doped fiber fibre core erbium particle dopant profiles schematic diagram in Fig. 1;
Fig. 4 is first mode Multiplexing module structural representation in Fig. 1;
Fig. 5 is the second mode multiplexing modular structure schematic diagram in Fig. 1;
Fig. 6 is gain and the Er-doped fiber length relation schematic diagram of each mode signal light in this four linearly polarized mode flashlight online Erbium-Doped Fiber Amplifier (EDFA) embodiment 1 linearly polarized mode flashlight;
Fig. 7 is that the gain of four linearly polarized mode flashlights of the online Erbium-Doped Fiber Amplifier (EDFA) embodiment 1 of this four linearly polarized mode flashlight and pattern related gain thereof are with LP
11mould pump power change schematic diagram;
Fig. 8 is the structural representation of the online Erbium-Doped Fiber Amplifier (EDFA) embodiment 2 of this four linearly polarized mode flashlight;
Fig. 9 is the second mode multiplexing modular structure schematic diagram in Fig. 8.
Be numbered in figure:
1, first mode Multiplexing module, 11, the first lens A, 12, double-tone spectroscope A, the 13, second lens A, 2, the first Er-doped fiber, 3, the second Er-doped fiber, the 4, second mode multiplexing module, the 41, first lens B, 42, double-tone spectroscope B, 43, the second lens B, the 5, first pump module, the 6, second pump module.
Embodiment
Below in conjunction with drawings and Examples, content of the present invention is further elaborated, but is not limitation of the invention.
Embodiment 1
This four linearly polarized mode flashlight online Erbium-Doped Fiber Amplifier (EDFA) embodiment 1 structured flowchart as shown in Figure 1.First mode Multiplexing module 1, first Er-doped fiber 2, second Er-doped fiber 3 and the second mode multiplexing module 4 are linked in sequence, first pump module 5 is connected with described first mode Multiplexing module 4, described first Er-doped fiber 2 and the second Er-doped fiber 3 are continued by optical fiber splicer, and splice loss, splice attenuation is ignored.
The four linearly polarized mode flashlight P of this example are the basic mode LP of C-band
01, high-order mode LP
11, LP
21and LP
02flashlight, the power that the flashlight of each pattern injects described first Er-doped fiber 2 through described first mode Multiplexing module is-10dBm.
This example first pump module 5 is forward pumping module, and its pump light produced is LP
11mould, centre wavelength is 980nm, and the power injecting described first Er-doped fiber 2 through described first mode Multiplexing module 1 is 24.7dBm ~ 27.8dBm.
The fiber core radius a of this example first Er-doped fiber 2 and the second Er-doped fiber 3 is 9.35 μm, and the numerical aperture that cladding index is 1.4505,1550nm place is 0.11.
This example first Er-doped fiber 2 fibre core erbium particle is annular doping, and as shown in Figure 2, in figure, horizontal ordinate is the radial r of fibre core, and unit be μm, and ordinate is the erbium particle concentration N adulterated, and unit is m
-3.The erbium particle concentration N of this example doping
0=1.50 × 10
25m
-3, doping ring internal diameter 2r
1for 1.4a=13.09 μm, the length L of the first Er-doped fiber 2
1for 3.5m.
Adulterate centered by this example second Er-doped fiber 3 fibre core erbium particle, as shown in Figure 3, in figure, horizontal ordinate is the radial r of fibre core, and unit be μm, and ordinate is the erbium particle concentration N adulterated, and unit is m
-3.The erbium particle concentration N of this example doping
0=1.50 × 10
25m
-3, Doping Center external diameter 2r
2for 0.6a=5.61 μm, the length L of the second Er-doped fiber 3
1for 5.3m.
This routine first mode Multiplexing module 1 as shown in Figure 4, be made up of the first lens A11, the double-tone spectroscope A12 that sequentially install and the second lens A13, double-tone spectroscope A12 wherein reflects 980nm pump light, transmission C-band four linearly polarized mode flashlight, the minute surface of double-tone spectroscope A12 becomes miter angle with the axis of the first lens A11, the second lens A13.
This example second mode multiplexing module 4 as shown in Figure 5, be made up of the first lens B41, the double-tone spectroscope B42 that sequentially install and the second lens B43, double-tone spectroscope B42 wherein reflects 980nm pump light, transmission C-band four linearly polarized mode flashlight, the axes normal of the minute surface of double-tone spectroscope B42 and the first lens B41, the second lens B43.
The operation method of this four linearly polarized mode flashlight online Erbium-Doped Fiber Amplifier (EDFA) embodiment 1 is specific as follows:
I, four linearly polarized mode flashlight P and LP
11mould pump light input first mode Multiplexing module 1, four linearly polarized mode flashlight P contains model centrifuge flashlight and center mode flashlight, model centrifuge flashlight and LP
11mould flashlight and LP
21mould flashlight, center mode flashlight and LP
01mould flashlight and LP
02mould flashlight.Four linearly polarized mode flashlights of input converge through the first lens A11 of described first mode Multiplexing module 1, the LP that the first pump module 5 inputs
11mould pump light is reflexed to horizontal direction by the double-tone spectroscope A12 that 45 degree are placed, and the four linearly polarized mode signal combiners converged with the first lens A11, jointly enter the second lens A13 and be coupled, then enter described first Er-doped fiber 2.
II, LP
11mould pump light amplifies four linearly polarized mode flashlights in the first Er-doped fiber 2.
Basic mode LP in four linearly polarized mode flashlight P
01, high-order mode LP
11, LP
21and LP
02the power that flashlight injects the first Er-doped fiber is-10dBm.
This example injects the LP of the first Er-doped fiber 2
11mould pumping light power is 24.7dBm ~ 27.8dBm.
The fibre core erbium particle of the first Er-doped fiber 2 is annular doping, model centrifuge flashlight, i.e. LP in the first Er-doped fiber 2
11mould flashlight and LP
21mould flashlight, with LP
11mould pump light, the fibre core erbium distribution of particles space overlap factor are large, therefore LP
11mould flashlight and LP
21mould flashlight obtains larger optical gain, LP
11mould flashlight and LP
21the gain that mould flashlight obtains in the first Er-doped fiber 2 is by the first Er-doped fiber 2 length L
1with the internal diameter 2r of fibre core erbium particle doping ring
1determine; And center mode flashlight, i.e. LP
01mould flashlight and LP
02mould flashlight, with LP in the first Er-doped fiber 2
11mould pump light, the fibre core erbium distribution of particles space overlap factor are low, this routine LP
01mould and LP
02mould flashlight obtains optical gain at the first Er-doped fiber 2 and is only LP
11mould and LP
21about 50% of the optical gain that mould flashlight obtains.LP
01mould flashlight and LP
02mould flashlight in the first Er-doped fiber 2 with LP
11mould pump light, fibre core erbium distribution of particles space overlap factor relative different are less than 4.9%, therefore LP
01mould and LP
02the optical gain relative different that mould flashlight obtains at the first Er-doped fiber 2 is also less than 4.9%.
III, after the first Er-doped fiber 2, remaining LP
11mould pump light and the four linearly polarized mode flashlights be amplified enter the second Er-doped fiber 3 jointly.Adulterate centered by second Er-doped fiber 3, center mode flashlight, i.e. LP in the second Er-doped fiber 3
01mould flashlight and LP
02mould flashlight, with LP
11mould pump light, the fibre core erbium distribution of particles space overlap factor are large, therefore LP
01mould and LP
02mould flashlight obtains larger optical gain, LP
01mould flashlight and LP
02the gain that mould flashlight obtains in the second Er-doped fiber 3 is by the second Er-doped fiber 3 length L
2with fibre core erbium particle centre doping external diameter 2r
2determine; LP
11mould flashlight and LP
21mould flashlight in the second Er-doped fiber 3 with LP
11mould pump light, the fibre core erbium distribution of particles space overlap factor are extremely low, and it is minimum that institute obtains gain.
In the online Erbium-Doped Fiber Amplifier (EDFA) of this example four linearly polarized mode flashlight, the gain of each mode signal light and Er-doped fiber length relation are as shown in Figure 6, in figure, horizontal ordinate is the total length L of the first Er-doped fiber 2 and the second Er-doped fiber 3, unit is rice (m), ordinate is yield value G, unit is that in dB, figure, solid line represents LP
01the gain trace of mould flashlight in the first Er-doped fiber 2 and the second Er-doped fiber 3, short stroke of dotted line represent LP
11the gain trace of mould flashlight in the first Er-doped fiber 2 and the second Er-doped fiber 3, pecked line represent LP
21the gain trace of mould flashlight in the first Er-doped fiber 2 and the second Er-doped fiber 3, dot-and-dash line represent LP
02the gain trace of mould flashlight in the first Er-doped fiber 2 and the second Er-doped fiber 3, through the LP of 26.4dBm
11the four linearly polarized mode flashlight average gains exported after mould pump power amplifies reach 19.1dB, and pattern related gain is less than 2dB.
This routine LP
11mould pump light is in different capacity situation, and through amplifying the average gain of four linearly polarized mode flashlights that exports and pattern related gain thereof as shown in Figure 7, in figure, horizontal ordinate is LP
11mould pumping light power, unit are milliwatt (mW), left side ordinate is flashlight yield value G, unit is dB, right side ordinate is pattern associated gain value Δ G, unit is dB, in figure, the line of zero represents four kinds of mode signal light average gains of output and the relation curve of pumping light power, flashlight average gain increases to 21.3dB with the increase of pumping light power from 15.1dB, the line intermediate scheme related gain of ☆ and the relation curve of pumping light power in figure, when pumping light power increases, pattern related gain remains between 1.86dB ~ 2.50dB.
IV, after the second Er-doped fiber 3, four linearly polarized mode flashlights of amplification and remaining LP
11mould pump light sends into the second mode multiplexing module 4, through the first lens B41 convergence, the remaining LP of double-tone spectroscope B42 filtering
11mould pump light, then four linearly polarized mode flashlight P ' of the amplification that is coupled by the second lens B43, exports.
Embodiment 2
As shown in Figure 8, difference from Example 1 is this four linearly polarized mode flashlight online Erbium-Doped Fiber Amplifier (EDFA) embodiment 2 structured flowchart:
(1) there are two pump modules, the first pump module 5 and the second pump module 6.First pump module 5 is forward pumping module, and it produces 980nm LP
11mould pump light; Second pump module 6 is backward pump module, and it produces 980nm LP
11mould pump light;
As shown in Figure 9, the angle of double-tone spectroscope B42 wherein and the first lens B41, the second lens B43 axis is 135 degree to the structure of (2) second mode multiplexing modules 4.
Other structure is identical with embodiment 1.
The operation method of this example is similar to embodiment 1, and difference is: in described step III, through the LP that the second mode multiplexing module 4 inputs
11mould pump light by double-tone spectroscope B42 to opposite direction horizontal reflection, through first lens B41 converge after inject the second Er-doped fiber 3, inject the LP of the second Er-doped fiber 3
11mould pumping light power is 16.9dBm ~ 24.7dBm, implements to amplify to four linearly polarized mode flashlights.
Above-described embodiment, be only the specific case further described object of the present invention, technical scheme and beneficial effect, the present invention is not defined in this.All make within scope of disclosure of the present invention any amendment, equivalent replacement, improvement etc., be all included within protection scope of the present invention.
Claims (8)
1. the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlights, comprises mode multiplexing module and Er-doped fiber, it is characterized in that:
Its first mode Multiplexing module (1), the first Er-doped fiber (2), the second Er-doped fiber (3) and the second mode multiplexing module (4) are linked in sequence; The fibre core erbium particle of the first Er-doped fiber (2) is annular doping, and the internal diameter of doping ring is 2r
1, doping ring external diameter be Er-doped fiber core diameter; Adulterate centered by second Er-doped fiber (3) fibre core erbium particle, Doping Center external diameter is 2r
2; The fiber core radius of described first Er-doped fiber (2) and the second Er-doped fiber (3) is a=4.67 μm ~ 12.8 μm, r
1=(0.45 ~ 0.75) a, r
2=(0.25 ~ 0.65) a; The length L of described first Er-doped fiber (2)
1=1.0 ~ 4.5m, the length L of the second Er-doped fiber (3)
2=1.5 ~ 6.5m; Described first Er-doped fiber (2) is 0.10 ~ 0.20 with the numerical aperture span of the second Er-doped fiber (3); Described first Er-doped fiber (2) is no more than 10% with the core diameter relative different of the second Er-doped fiber (3); Described first Er-doped fiber (2) is less than 5% with the fiber core refractive index relative different of the second Er-doped fiber (3);
First pump module (5) is connected with described first mode Multiplexing module (1), and the first pump module (5) is forward pumping module, and it produces LP
11mould pump light;
Described first mode Multiplexing module (1) is made up of the first lens A (11), the double-tone spectroscope A (12) that sequentially install and the second lens A (13), double-tone spectroscope A (12) reflected pump light wherein, transmission four linearly polarized mode flashlight, the minute surface of double-tone spectroscope A (12) becomes miter angle with the axis of the first lens A (11), the second lens A (13); Described second mode multiplexing module (4) is made up of the first lens B (41), the double-tone spectroscope B (42) that sequentially install and the second lens B (43), double-tone spectroscope B (42) reflected pump light wherein, transmission four linearly polarized mode flashlight, the axes normal of the minute surface of double-tone spectroscope B (42) and the first lens B (41), the second lens B (43).
2. the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlight according to claim 1, is characterized in that:
Between described first Er-doped fiber (2) and the second Er-doped fiber (3), welding is continuous.
3. the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlight according to claim 1, is characterized in that:
Described Erbium-Doped Fiber Amplifier (EDFA) also can have the second pump module (6) to be connected with described second mode multiplexing module (4), and the second pump module (6) is backward pump module, and it produces LP
11mould pump light;
The minute surface of the double-tone spectroscope B (42) of described second mode multiplexing module (4) becomes 135 degree of angles with the axis of the first lens B (41), the second lens B (43).
4. the operation method of the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlight according to claim 1, is characterized in that specific as follows:
I, four linearly polarized mode flashlight P and LP
11mould pump light input first mode Multiplexing module (1), four linearly polarized mode flashlight P contain flashlight and the center mode flashlight of model centrifuge, the flashlight of model centrifuge and LP
11mould flashlight and LP
21mould flashlight, center mode flashlight and LP
01mould flashlight and LP
02mould flashlight; Four linearly polarized mode flashlights of input converge through the first lens A (11) of described first mode Multiplexing module (1), the LP that the first pump module (5) inputs
11mould pump light by double-tone spectroscope A (12) reflection, with the four linearly polarized mode signal combiners converged, then be coupled into the first Er-doped fiber (2) through the second lens A (13);
II, LP
11mould pump light amplifies four linearly polarized mode flashlights in the first Er-doped fiber (2),
The fibre core erbium particle of the first Er-doped fiber (2) is annular doping, the LP of model centrifuge in the first Er-doped fiber (2)
11mould flashlight and LP
21mould flashlight obtains larger optical gain; And the LP of center mode
01mould flashlight and LP
02mould flashlight obtains optical gain at the first Er-doped fiber (2) and is only LP
11mould flashlight and LP
2143% ~ 55% of the optical gain that mould flashlight obtains;
III, after the first Er-doped fiber, remaining LP
11mould pump light and the four linearly polarized mode flashlights be amplified enter the second Er-doped fiber (3) jointly; Adulterate centered by second Er-doped fiber (3), center mode flashlight and LP in the second Er-doped fiber
11mould pump light, the fibre core erbium distribution of particles space overlap factor are large, LP
01mould flashlight and LP
02mould flashlight obtains larger optical gain, LP
11mould flashlight and LP
21the optical gain that mould flashlight obtains in the second Er-doped fiber (3) is minimum;
IV, after the second Er-doped fiber, four linearly polarized mode flashlights of amplification and remaining LP
11mould pump light sends into the second mode multiplexing module (4), through the first lens B (41) convergence, the remaining LP of double-tone spectroscope B (42) filtering
11mould pump light, then four linearly polarized mode flashlights of the amplification that is coupled by the second lens B (43), exports.
5. the operation method of the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlight according to claim 4, is characterized in that:
In described step II, LP
01mould flashlight and LP
02mould flashlight in the first Er-doped fiber (2) with LP
11the relative different of mould pump light, the fibre core erbium distribution of particles space overlap factor is less than 10%, LP
01mould and LP
02the optical gain relative different that mould flashlight obtains at the first Er-doped fiber (2) is less than 10%.
6. the operation method of the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlights according to claim 4 or 5, is characterized in that
The LP that in described step I, the first pump module (5) inputs
11the power of mould pump light is greater than 100mW.
7. the operation method of the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlight according to claim 6, is characterized in that:
Described Erbium-Doped Fiber Amplifier (EDFA) also has the second pump module (6) to be connected with described second mode multiplexing module (4), and the second pump module (6) is backward pump module, its LP produced
11mould pump light; The minute surface of the double-tone spectroscope B (42) of described second mode multiplexing module (4) becomes 135 degree of angles with the axis of the first lens B (41), the second lens B (43);
In described step III, through the LP that the second mode multiplexing module (4) inputs
11mould pump light by double-tone spectroscope B (42) to opposite direction horizontal reflection, through first lens B (41) converge after enter the second Er-doped fiber (3), to four linearly polarized mode flashlights implement amplify.
8. the operation method of the online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlight according to claim 7, is characterized in that:
The LP that described second pump module (6) inputs
11the power of mould pump light is greater than 50mW.
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| CN108899751A (en) * | 2018-08-20 | 2018-11-27 | 桂林电子科技大学 | Support the EDFA and its modal gain equalization methods of six linearly polarized mode signal light amplification |
| CN110658662A (en) * | 2019-08-27 | 2020-01-07 | 同济大学 | MM-EDFA-based hybrid multimode amplifier and implementation method |
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| US20140063592A1 (en) * | 2012-09-05 | 2014-03-06 | Nec Laboratories America, Inc. | 6x28-Gbaud Few-Mode Fiber Recirculating Loop Transmission with Gain-Equalized Inline Few-Mode Fiber Amplifier |
| CN104185804A (en) * | 2012-01-12 | 2014-12-03 | 康宁股份有限公司 | Few mode optical fibers for er doped amplifiers, and amplifiers using such |
| CN204256337U (en) * | 2014-12-16 | 2015-04-08 | 桂林电子科技大学 | The online Erbium-Doped Fiber Amplifier (EDFA) of four linearly polarized mode flashlights |
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| US20010043388A1 (en) * | 2000-02-29 | 2001-11-22 | Yochay Danziger | High order mode erbium-doped fiber amplifier |
| JP2001358388A (en) * | 2000-06-13 | 2001-12-26 | Mitsubishi Cable Ind Ltd | Optical fiber, optical fiber amplifier, and fiber laser |
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| CN108899751A (en) * | 2018-08-20 | 2018-11-27 | 桂林电子科技大学 | Support the EDFA and its modal gain equalization methods of six linearly polarized mode signal light amplification |
| CN108899751B (en) * | 2018-08-20 | 2024-05-28 | 桂林电子科技大学 | EDFA supporting six-linear polarization mode signal light amplification and mode gain equalization method thereof |
| CN110658662A (en) * | 2019-08-27 | 2020-01-07 | 同济大学 | MM-EDFA-based hybrid multimode amplifier and implementation method |
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