CN1721896A - Highly nonlinear optical fiber and highly nonlinear optical fiber module - Google Patents
Highly nonlinear optical fiber and highly nonlinear optical fiber module Download PDFInfo
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- CN1721896A CN1721896A CN 200510082586 CN200510082586A CN1721896A CN 1721896 A CN1721896 A CN 1721896A CN 200510082586 CN200510082586 CN 200510082586 CN 200510082586 A CN200510082586 A CN 200510082586A CN 1721896 A CN1721896 A CN 1721896A
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Abstract
A highly nonlinear optical fiber includes a core, a cladding surrounding the core, and a coating covering the cladding. A bending loss at a wavelength of 1550nm with a bending diameter of 20mm is equal to or less than 0.01 dB/m. A nonlinear coefficient at the wavelength of 1550nmis equal to or more than 10*W<-1>km<-1>. A cut-off wavelength is equal to or less than 1530nm. A zero dispersion wavelength is in a range between 1400nm and 1650nm. A diameter of the coating is 125 mu m with a tolerance of +-5% percent.
Description
Technical field
The present invention relates to high non-linearity (highly nonlinear) optical fiber and highly nonlinear optical fiber module; More specifically, relate to having and be used to utilize non-linear phenomena to carry out the highly nonlinear optical fiber of the big nonlinear factor that light signal handles, and as the highly nonlinear optical fiber module of holding the high non-linearity device that is coiled into eiloid highly nonlinear optical fiber.
Background technology
The transfer rate that is applied to the actual every wavelength channel of optical fiber communication at present is 10Gbit/s.In order to improve the total transmittability in high capacity wavelength-division multiplex (WDM) transmission, and do not make system's overcomplicated, just need to improve the transfer rate of every passage.In the case, carried out energetically at every passage 40Gbit/s or more high transmission rates carry out the research of hypervelocity Optical Fiber Transmission.
In response to the raising of transfer rate, the peak power of signal just increases, and along with non-linear phenomena (for example, from phase modulation (PM), phase modulation (PM) and the mixing of four ripples mutually) has appearred in signal peak power be increased in more significantly in the optical fiber.This type of non-linear phenomena has worsened transport property.On the other hand, the advantage of non-linear phenomena is that its high-speed response can be applied to high-speed optical signal and handle.
In recent years, developed highly nonlinear optical fiber (HNLF) with high non-linearity.Along with the carrying out of this exploitation, utilize the light signal processing of highly nonlinear optical fiber to obtain to popularize.
Highly nonlinear optical fiber is used to utilize the light signal of non-linear phenomena to handle.Highly nonlinear optical fiber is as transmission line, but form assembly (package) and be combined in transmitting device or light source in.When optical fiber was formed in this assembly, highly nonlinear optical fiber was around the bobbin coiling or do not use bobbin and cyclic coil, and obtains using.
Be coiled into the volume that eiloid optical fiber occupies assembly in this way and depend on the volume of optical fiber and the number percent in space thereof.The number percent in space is the number percent of the volume that optical fiber self occupies in the volume V of the part of coiled fiber.In bobbin shown in Figure 6, volume V is represented by following equation (1).Along with the xsect of optical fiber, i.e. the increase of optical fiber external diameter (hereinafter being referred to as coating diameter), the number percent in space increases.
V＝W×{((d
1-d
2)/2)
2-(d
2/2)
2)}×π (1)
When reducing the coiling diameter (internal diameter of bobbin) of optical fiber for the size that reduces assembly, the coiling of optical fiber distortion (winding distortion) increases.This coiling distortion is proportional with the diameter (hereinafter being referred to as cladding diameter) of fibre cladding.Thereby, must reduce cladding diameter, to reduce the coiling distortion.
Traditionally, as highly nonlinear optical fiber with the diameter that reduces, propose to have the optical fiber of 110 μ m cladding diameters and 150 μ m coating diameters and had 89 μ m cladding diameters and the optical fiber of 115 μ m coating diameters (see also, for example, U.S. Patent No. 6661958).
When reducing the cladding diameter of highly nonlinear optical fiber, its coiling diameter reduces.Yet, for example, this make be difficult to highly nonlinear optical fiber and optical fiber with conventional cladding diameter (as, be used to connect the optical fiber of verifying attachment) couple together.Normal dia that it should be noted that optical fiber is that about 125 μ m and its coating diameter are about 250 μ m.
In order to guarantee the quality of optical fiber, after manufacturing, to optical fiber relate to the 5-10 item (as, loss and dispersion characteristics) check.Equally highly nonlinear optical fiber is carried out identical check.
For example, the optical time domain reflectometer (OTDR) that is used to measure loss when employing is during as verifying attachment, and optical fiber to be tested is connected to OTDR by the optical fiber that is used to connect verifying attachment.
As the method for the optical fiber that is connected to each other, there are fusion joint method (fuse splicing method) and open joint method (butt joint method).In the fusion joint method, under the state that the coating with the place, connection end of optical fiber to be tested and the optical fiber that is used to be connected verifying attachment removes, when the optical axis of two optical fiber cooperated, the fiber end face of two optical fiber was heated and melts.Can reduce junction loss by using this method.Yet fusion is wasted time and energy.
On the other hand, in the open joint method, the coating that the connection end of two optical fiber is located removes, and to expose glass part, the end face with glass part on V-shaped groove docks each other, to connect.In this open joint method, can connect optical fiber in a short period of time.
The highly nonlinear optical fiber that is difficult to will to have minor diameter on V-shaped groove couples together with the optical fiber with normal dia that is used to be connected verifying attachment, and this is because the cladding diameter difference of two optical fiber.
Summary of the invention
The objective of the invention is to solve at least these problems in the conventional art.
According to the highly nonlinear optical fiber of one aspect of the invention comprise fibre core, around the covering of fibre core and the coating that covers covering.With after the bending of 20mm bending diameter on the 1550nm wavelength bending loss be equal to or less than 0.01dB/m.Nonlinear factor is equal to or greater than 10W on the 1550nm wavelength
-1Km
-1Cutoff wavelength is equal to or less than 1530nm.Zero-dispersion wavelength is in the scope between 1400nm and the 1650nm.The diameter of coating is 125 μ m, it has ± and 5% tolerance.
Highly nonlinear optical fiber module according to a further aspect of the invention comprises highly nonlinear optical fiber, and this highly nonlinear optical fiber comprises fibre core, around the covering of fibre core and the coating that covers covering.With after the bending of 20mm bending diameter on the 1550nm wavelength bending loss be equal to or less than 0.01dB/m.Nonlinear factor is equal to or greater than 10W on the 1550nm wavelength
-1Km
-1Cutoff wavelength is equal to or less than 1530nm.Zero-dispersion wavelength is in the scope between 1400nm and the 1650nm.The diameter of coating is 125 μ m, it has ± and 5% tolerance.
By reading the detailed description of currently preferred embodiments of the invention being carried out below in conjunction with accompanying drawing, above-mentioned and other purposes, feature, advantage and technology and industrial importance of the present invention will be understood better.
Description of drawings
Fig. 1 is the sectional view and the index distribution of the high non-linearity exemplary fibers in the embodiment of the invention;
Fig. 2 is the synoptic diagram that is used to measure according to the system of the high non-linearity fiber properties of present embodiment;
Fig. 3 is the sectional view that is used to measure according to the V-shaped groove device of the high non-linearity fiber properties of present embodiment;
Fig. 4 utilizes the V-shaped groove device to connect sectional view according to the state of the high non-linearity fiber of present embodiment and illusory fiber (dummy fiber);
Fig. 5 is the curve map that concerns according between the junction loss of the high non-linearity fiber of present embodiment and conventional fiber connection and the fibre diameter ratio;
Fig. 6 is the side view that is used to coil according to the bobbin of the high non-linearity fiber of present embodiment;
Fig. 7 is the synoptic diagram of high non-linearity fibre module, wherein according to the high non-linearity fibre winding reel of present embodiment around and be contained in the framework;
Fig. 8 is the synoptic diagram of high non-linearity fibre module, does not wherein use bobbin and coils according to the high non-linearity fiber of present embodiment and be contained in the framework; And
Fig. 9 is sectional view and the index distribution according to another example of the high non-linearity fiber of present embodiment.
Embodiment
With reference to the accompanying drawings exemplary embodiment of the present is described.
As the parameter of the nonlinear characteristic of representing the high non-linearity fiber, nonlinear factor γ is represented by equation (2).In this expression formula, λ is a light wavelength, and n2 is the nonlinear refractive index of high non-linearity fiber, and Aeff is a net sectional area.
γ＝(2π/λ)×(n2/Aeff) (2)
Can produce non-linear phenomena effectively by improving nonlinear factor γ.Preferably, the high non-linearity fiber has 10W
-1Km
-1Or higher nonlinear factor, suitably to be used as the high non-linearity fiber.In order to improve γ, it is enough increasing the n2 in the equation (2) and reducing Aeff.Yet when improving γ by this kind method, cutoff wavelength (cut-off wavelength) migrates to long wavelength side.Cutoff wavelength is illustrated in the G.650.1 fiber cutoff wavelength λ C of middle definition of ITU-T (standardization department of international telecommunication union telecommunication).
In order to produce non-linear phenomena effectively, importantly, set cutoff wavelength to such an extent that be shorter than the amplification wavestrip of Erbium-Doped Fiber Amplifier (EDFA) (EDFA).Thereby, preferably cutoff wavelength is set at 1530nm or littler.In addition, when attempting to utilize non-linear phenomena to carry out wavelength Conversion, need be near the wavelength the zero-dispersion wavelength of fiber with the wavelength set of laser (pumpinglight).Thereby, preferably, the zero-dispersion wavelength of high non-linearity fiber is set in the scope between the 1400nm to 1650nm.
The following describes and to guarantee enough nonlinear high non-linearity fibers that suppresses cutoff wavelength simultaneously.It should be noted that the term that does not have special definition in the instructions subsequently will follow definition and the measuring method of ITU-T in G.650.
Fig. 1 is the sectional view of high non-linearity fiber in the embodiment of the invention and the schematic index distribution that makes progress in the footpath of this high non-linearity fiber.In this sectional view, the high non-linearity fiber has the cross section structure perpendicular to its central shaft.The horizontal ordinate of index distribution is corresponding to the position of the line I-I in the sectional view of high non-linearity fiber, though its ratio is different from the ratio of xsect.
In Fig. 1, high non-linearity fiber 10 has: first fibre core 1 with a μ m diameter that comprises optical axis center, around second fibre core 2 with b μ m diameter of first fibre core 1, around the 3rd fibre core 3 with c μ m diameter of second fibre core 2, and around the covering 4 of the 3rd fibre core 3.This first to the 3rd fibre core 1-3 and covering 4 are by for example silicon dioxide (SiO
2) sill formation.With the diameter of covering 4, promptly cladding diameter d sets little extremely for example 40,50,60,70 or 80 μ m for, to realize the reduction around the bobbin diameter of its coiling high non-linearity fiber 10.
First fibre core 1 forms with to SiO
2Mix scheduled volume GeO as adulterant
2And has n
C1Largest refractive index.Second fibre core 2 is formed by a kind of material, and this material has the refractive index that is lower than covering 4 and with for example to SiO
2Mix scheduled volume F and have n
C2Minimum refractive index.The 3rd fibre core 3 has the refractive index that is higher than covering 4 and is lower than first fibre core 1, and forms with to SiO
2Mix scheduled volume GeO
2And has n
C3Largest refractive index.It should be noted that first fibre core 1, second fibre core 2 and the 3rd fibre core 3 also are called central core (center core section), are subjected to suppress layer (depressedlayer) and side sandwich layer (side core layer).
Covering 4 has refractive index n
cAnd generally basically by pure SiO
2Form.Yet, also can add F to covering 4.
Respective indices of refraction n with first fibre core 1, second fibre core 2, the 3rd fibre core 3 and covering 4
C1, n
C2, n
C3And n
cBe set at and have n
C1＞n
C3＞n
c＞n
C2Relation.The index distribution of this type of high non-linearity fiber 10 is called W-portion segment type.
Refractive index contrast is expressed as follows in the distribution shown in Fig. 1.Refractive index n at covering 4
cThe basis on, calculate the refractive index contrast Δ 1 of first fibre core 1 by equation (3), calculate the refractive index contrast Δ 2 of second fibre core 2 by equation (4), calculate the refractive index contrast Δ 3 of the 3rd fibre core 3 by equation (5).
Δ1＝{(n
c1-n
c)/n
c1}×100％ (3)
Δ2＝{(n
c2-n
c)/n
c2}×100％ (4)
Δ3＝{(n
c3-n
c)/n
c3}×100％ (3)
It is desirable to, the high non-linearity fiber has 2.0% or bigger refractive index contrast Δ 1 and-0.3% or refractive index contrast Δ 2 still less, to guarantee enough characteristics.
In the periphery of covering 4, ultraviolet curable resin layer forms has double-deck coating 5.The first inboard coating 5a is formed by the material of the Young modulus with the second coating 5b that is lower than the outside.With the diameter of coating 5 peripheries, promptly coating diameter is set for little of for example 125 μ m ± 5%.
For the size of the assembly that reduces wherein to have held the high non-linearity fiber, optimize the cladding diameter and the coating diameter of high non-linearity fiber, and optimize the treatment effeciency in the high non-linearity fiber is tested.
In order to reduce the size of assembly, need perhaps coil the high non-linearity fiber around the ring that has than minor diameter, and not use bobbin with coil shape around less bobbin coiling high non-linearity fiber with coil shape.For with less coiling diameter coiling high non-linearity fiber 10, just need reduce the coating diameter of high non-linearity fiber 10.
The high non-linearity fiber depends on the characteristic of high non-linearity fiber 10 and the design of application with respect to the length of an assembly.In other words, when nonlinear factor γ was big, high non-linearity fiber 10 was just short, and when nonlinear factor γ hour, high non-linearity fiber 10 was just long.For example, the longest about 400m of being of high non-linearity fiber that has big nonlinear factor γ.
For modularization in assembly and hold high non-linearity fiber 10, go forward side by side to exercise around for example bobbin coiling high non-linearity fiber 10 and use.The size of bobbin depends on the volume of high non-linearity fiber 10 and the number percent in space.For example, when the diameter with the coating 5 of high non-linearity fiber 10 was set at 100 μ m to 250 μ m, the number percent in space was fixed on 65% basically.Thereby the diameter of bobbin depends on the volume of high non-linearity fiber 10.When the length of high non-linearity fiber 10 fixedly the time, the diameter of bobbin depends on the coating diameter of high non-linearity fiber 10.Thereby,, only need to reduce the coating diameter of high non-linearity fiber 10 in order to reduce the size of bobbin.
When not using bobbin high non-linearity fiber 10 being formed the ringed line cast, reason is identical.The reducing of the coating diameter of high non-linearity fiber 10 causes the reducing of volume of annulus.
In order to reduce the coating diameter of high non-linearity fiber 10, must consider by coating 5 is applied to the effect that high non-linearity fiber 10 is obtained.
The glass that first purpose of coating is to prevent to form first to the 3rd fibre core 1-3 and covering 4 is scratched and is reduced its intensity.Second purpose of coating is to prevent that transport property is owing to the distortion that the stress that puts on high non-linearity fiber 10 causes is worsened.
Thereby in order to realize first purpose, coating 5 need have enough thickness, to prevent exotic contact glass.Even this thickness is less than the thickness of the required coating 5 of second purpose that is used to alleviate the pressure that puts on the high non-linearity fiber 10 for realization, this coating also can illustrate enough effects.
The thickness of coating 5 depends on the thickness that is used to realize second purpose.The deterioration of the transport property that causes for the distortion that prevents owing to first to the 3rd fibre core 1-3 and covering 4 preferably, forms double-deck coating 5 as shown in Figure 1.The Young modulus that will form the resin of the first coating 5a in the inboard is set lowly, and the Young modulus that will form the resin of the second coating 5b in the outside is set highly.Consequently, so-called shell effect occurs, transfer to first to the 3rd fibre core 1-3 and covering 4 to prevent external force.
Common optical fiber forms optical cable (cable) and can be used for various fields.Thereby, the external diameter of its coating 5 is set at about 250 μ m.On the other hand, because high non-linearity fiber 10 is treated to coil shape and is applied in the aforesaid device, compare with the optical fiber that forms optical cable, the stress that is applied thereto is very little.Thereby, can be with the Thickness Design of coating 5 less than common optical fiber.
, can not reduce core diameter and cladding diameter, to reduce the coating diameter of high non-linearity fiber 10 from preventing to cause the angle of distortion by external force yet.
In the wavestrip of 1.55 μ m (1530nm to 1570nm), mould field (modefield) diameter (MFD) of high non-linearity fiber 10 is generally equal to or less than 5 μ m.Generally, the cladding diameter that the mode field diameter of must having an appointment is 10 times is to transmit light reposefully.
Thereby, under the situation of high non-linearity fiber 10,, then can transmit light in the mode identical with optical fiber with bigger cladding diameter if cladding diameter is at least about 40 μ m.
When the diameter of the covering 4 that reduces high non-linearity fiber 10 in this way, can reduce coating diameter, and not change the thickness that the footpath of coating 5 makes progress.Thereby,, also can reduce the diameter of high non-linearity fiber 10 even on the level that function remains on optical fiber is identical usually with coating 5.
Thereby, except the thickness of the coating 5 that reduces high non-linearity fiber 10, can further reduce coating diameter by the diameter that reduces covering 4.This is favourable for the size that reduces assembly.
On the other hand, in order to guarantee the reliability of high non-linearity fiber 10, importantly suppress the distortion of high non-linearity fiber 10.The coiling distortion and the cladding diameter of high non-linearity fiber 10 are proportional.Thereby, when the increase of the coiling distortion of controlling high non-linearity fiber 10 by the cladding diameter that reduces high non-linearity fiber 10, can reduce the coiling diameter of high non-linearity fiber 10.This is favourable for the size that reduces coil.
Fig. 2 is the synoptic diagram of state that is used to utilize the measurement of OTDR device check optical propagation loss etc.In Fig. 2, the connector 12a with optical fiber of connector 12 is connected in OTDR device 11.As shown in the part that is centered on by dotted line among Fig. 2, an end fusion that is used to connect the illusory fiber 13 of verifying attachment is engaged in an end that does not have connector one side of the optical fiber with connector 12.
Have the optical fiber of connector 12 and illusory fiber 13 and formed by single-mode fiber, this single-mode fiber has 125 μ m cladding diameters and 250 μ m coating diameters.Illusory fiber 13 be used for replenishing the optical fiber with connector 12 length fiber and multiple folding around bobbin 17 coilings.Optical fiber with normal dia is as illusory fiber 13, so that illusory fiber 13 and various optical fiber are coupled together.
The other end of illusory fiber 13 is connected in an end of high non-linearity fiber 10 to be measured by V-shaped groove device 15, these high non-linearity fiber 10 rolls 16 coilings.
It should be noted that in explanation subsequently, suppose and use high non-linearity fiber 10 with 125 μ m coating diameters.
As shown in Figure 3, V-shaped groove device 15 comprises: the V-shaped groove liner 15b that is made of metal, and it has V-shaped groove 15a; By the stripper plate 15d that acrylic acid is made, it has teat 15c at the position relative with V-shaped groove 15a.It should be noted that Fig. 3 is the sectional view that covering 13a and fibre core 13c are held in the state between V-shaped groove 15a and the stripper plate 15d, covering 13a and fibre core 13c expose by the coating that removes illusory fiber 13 ends.
With the V-shaped groove 15a of identical width with the linear landform forming V-shape of identical degree of depth pit liner 15b.Thereby, after removing illusory fiber 13 and having the coating at end place of high non-linearity fiber 10 of minor diameter usually, when the method by open joint was docking together their end face on V-shaped groove 15a each other, departed from each other their first fibre core 1 and the position of 13c.This is because the diameter of the covering 4 of first fibre core 1 and 13c and covering 13a is very different.Consequently, junction loss increases and measuring accuracy decline.
Thereby, the coating of illusory fiber 13 ends is removed to expose the end face of covering 13a.On the other hand, expose the end face of high non-linearity fiber 10, keep coating 5 simultaneously.
Subsequently, as shown in Figure 4, the end face of a certain end face of the coating of high non-linearity fiber 10 and the glass part of illusory fiber 13 is butt joint each other on V-shaped groove 15a.Then, consistent each other basically and first fibre core 1 in the position of first fibre core 1 of the position of the fibre core 13c of illusory fiber 13 and high non-linearity fiber 10 suitably is connected with 13a.It should be noted that Fig. 4 is the sectional view along Fig. 3 center line II-II, though wherein used the ratio that is different among Fig. 3.
Conventional single-mode fiber with 125 μ m cladding diameters is used as illusory fiber 13, and prepares a plurality of high non-linearity fibers with minor diameter as high non-linearity fiber 10, and described a plurality of high non-linearity fibers have the different coating diameter.Connect illusory fiber 13 and high non-linearity fiber as illustrated in fig. 4.When in the case the junction loss that is relevant to high non-linearity fiber coat diameters being measured, obtain result as shown in Figure 5.
Among Fig. 5, horizontal ordinate is represented the fibre diameter ratio, and it is the ratio of the coating diameter of high non-linearity fiber with respect to the cladding diameter 125 μ m of illusory fiber 13.Ordinate is represented the junction loss of illusory fiber 13 and high non-linearity fiber 10.
According to Fig. 5, as can be seen, when the fibre diameter ratio increases ± 5% or more for a long time, junction loss sharply rises.
Thereby, adopt the open joint method, as shown in Figure 4, this method is used to utilize V-shaped groove device 15 to connect illusory fiber 13 and the high non-linearity fiber 10 with minor diameter.So, if use the high non-linearity fiber 10 of the coating diameter of the cladding diameter 95-105% with illusory fiber 13, then can suitably connect high non-linearity fiber 10 and illusory fiber 13.
The key property that has the high non-linearity fiber 10 of minor diameter shown in the table 1-3.Shown in Fig. 3 and 4, in measuring these characteristics, have the high non-linearity fiber 10 to be measured of minor diameter by V-shaped groove 15a and stripper plate 15d clamping, and need not to divest its coating.Consequently, can use general illusory fiber 13 these characteristics to be carried out the measurement of success with 125 μ m cladding diameters.It should be noted that the symbol Φ in " bending loss " item represents bending diameter in the table.
Table 1
Δ1：2.8％ Δ2：-0.55％ Δ3：0.3％、a/b：0.6、b/c：1.25、b：6.7μm
| Fibre length | km | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Fibre diameter | μm | 80 | 70 | 60 | 50 | 40 |
| Coating diameter | μm | 128 | 127 | 125 | 124 | 123 |
| Loss (1550nm) | dB/km | 0.91 | 0.87 | 0.84 | 0.84 | 0.82 |
| Dispersion values (1550nm) | ps/(nm·km) | 0.12 | 0.57 | 0.31 | 0.21 | 0.35 |
| Chromatic dispersion gradient (1550nm) | ps/(nm 2·km) | 0.015 | 0.012 | 0.011 | 0.013 | 0.018 |
| λ 0 | nm | 1542.0 | 1502.5 | 1521.8 | 1533.8 | 1530.6 |
| Cutoff wavelength | nm | 1456 | 1383 | 1425 | 1401 | 1425 |
| MFD(1550nm) | μm | 4.0 | 4.1 | 4.1 | 4.0 | 4.1 |
| Aeff(1550nm) | μm 2 | 11.2 | 11.3 | 11.3 | 11.2 | 11.5 |
| PMD | ps/km 1/2 | 0.10 | 0.12 | 0.08 | 0.09 | 0.11 |
| Bending loss (Φ 20nm, 1550nm) | dB/m | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 |
| γ | l/W/km | 19.1 | 20.1 | 19.3 | 18.2 | 18.5 |
Table 2
Δ1：2.8％ Δ2：-1.0％ Δ3：0.3％、a/b：0.4、b/c：1.25、b：9.1μm
| Fibre length | km | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Fibre diameter | μm | 80 | 70 | 60 | 50 | 40 |
| Coating diameter | μm | 129 | 127 | 125 | 124 | 123 |
| Loss (1550nm) | dB/km | 1.21 | 1.20 | 1.15 | 1.09 | 1.03 |
| Dispersion values (1550nm) | ps/(nm·km) | 0.12 | -0.31 | 0.55 | -0.54 | 0.32 |
| Chromatic dispersion gradient (1550nm) | Ps/(nm 2·km) | 0.011 | 0.011 | 0.010 | 0.014 | 0.010 |
| λ 0 | nm | 1538.6 | 1577.4 | 1496.1 | 1589.7 | 1517.0 |
| Cutoff wavelength | nm | 1401 | 1358 | 1310 | 1287 | 1355 |
| MFD(1550nm) | μm | 3.5 | 3.4 | 3.4 | 3.5 | 3.5 |
| Aeff(1550nm) | μm 2 | 10.3 | 10.1 | 10.2 | 10.3 | 10.3 |
| PMD | ps/km 1/2 | 0.05 | 0.12 | 0.22 | 0.30 | 0.09 |
| Bending loss (Φ 20nm, 1550nm) | dB/m | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 |
| γ | l/W/km | 23.1 | 24.1 | 23.3 | 23.2 | 23.8 |
Table 3
Δ1：2.0％ Δ2：-0.55％ Δ3：0.3％、a/b：0.57、b/c：1.25、b：7.8μm
| Fibre length | km | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Fibre diameter | μm | 80 | 70 | 60 | 50 | 40 |
| Coating diameter | μm | 128 | 126 | 124 | 123 | 123 |
| Loss (1550nm) | dB/km | 0.38 | 0.38 | 0.36 | 0.35 | 0.35 |
| Dispersion values (1550nm) | ps/(nm·km) | 0.56 | -0.25 | 0.61 | 0.05 | -0.22 |
| Chromatic dispersion gradient (1550nm) | ps/(nm 2·km) | 0.023 | 0.023 | 0.017 | 0.018 | 0.008 |
| λ 0 | nm | 1526.0 | 1561.1 | 1514.7 | 1547.2 | 1579.3 |
| Cutoff wavelength | nm | 1225 | 1258 | 1191 | 1207 | 1185 |
| MFD(1550nm) | μm | 4.5 | 4.4 | 4.6 | 4.5 | 4.4 |
| Aeff(1550nm) | μm 2 | 14.2 | 13.5 | 14.5 | 14.2 | 14.4 |
| PMD | ps/km 1/2 | 0.13 | 0.04 | 0.02 | 0.06 | 0.03 |
| Bending loss (Φ 20nm, 1550nm) | dB/m | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 |
| γ | l/W/km | 12.5 | 12.4 | 11.8 | 12.3 | 12.7 |
The mode field diameter of high non-linearity fiber 10 is generally about 4 μ m, and it is minimum comparing this with the single-mode fiber of routine.Thereby, consider connectivity etc., common practice is that the end that utilizes the fusion joint method will be coiled into end of multiple folding high non-linearity fiber and single-mode fiber in assembly couples together and by single-mode fiber the high non-linearity fiber is connected to conventional fiber outside the assembly.
Single-mode fiber utilization with the cladding diameter that reduces has the high non-linearity fiber manufacturing of minor diameter and fusion and engages and form, to form the small modules of the high non-linearity fiber shown in the following example.
Small modules is to utilize as shown in Figure 6 bobbin 20 to make in structure as shown in Figure 7 to form.If do not use bobbin, small modules is just made in structure as shown in Figure 8 and is formed.
In first example, high non-linearity fiber 10 with 80 μ m cladding diameters and 125 μ m coating diameters coils around bobbin shown in Figure 6 20 as the high non-linearity fiber and with the length of 400m, to make module, this high non-linearity fiber has structure as shown in fig. 1.In the case, consider the coiling distortion of high non-linearity fiber 10, with the coiling diameter in the bobbin 20, the i.e. inner diameter d of bobbin 20
2Be set at 45mm.It should be noted that the inner diameter d of bobbin 20
2The external diameter of the main body 20a of expression bobbin 20.
In the case, because the coating diameter of high non-linearity fiber 10 is set at 125 μ m, thereby the volume of high non-linearity fiber 10 can be decreased to 1/4 of optical fiber with 250 μ m coating diameters.This causes the reduction of bobbin size.
Thereby bobbin 20 has following shape, wherein with inner diameter d
2Be set at 45mm, with the outside diameter d of collar part 20b
1Be set at 65mm, the inner width W between the two collar part 20b is set at 5mm, and with the width W of collar part 20b
1Be set at 1mm.
As shown in Figure 7, an end fusion that will have a single-mode fiber 21 of 80 μ m cladding diameters is engaged in the two ends that form eiloid high non-linearity fiber 10.Then, high non-linearity fiber 10 is contained in the framework 23 by following state, wherein chuck (connector) 22 is connected in other ends of single-mode fiber 21.
Thereby, make the high non-linearity optical module (HNLM) that has from the single-mode fiber of chuck extraction.
As mentioned above, the splice-losses in the fusion with the high non-linearity fiber 10 with 80 μ m cladding diameters engages can have the single-mode fiber 21 of 80 μ m cladding diameters and successfully be controlled to be 0.1 decibel or littler by use.
Consider the simplicity of using optical fiber, attempt single-mode fiber 21 with 105 μ m cladding diameters and the high non-linearity fiber 10 with minor diameter are carried out the fusion joint.When use has the high non-linearity fiber of 80 μ m cladding diameters, the splice-losses that engages with single-mode fiber 21 fusions successfully can be controlled to be 0.1 decibel or littler.The single mode fibre with 125 μ m cladding diameters that links to each other with connector can be connected in this module and use this single mode fibre.
Because the size of bobbin 20 is minimized as mentioned above, so module size can be reduced to 70mm on length, be reduced to 100mm and in height be reduced to 10mm on width.Internal diameter that it should be noted that bobbin can be set at 20-60mm, and its inner width can be set at 5-20mm.
In second example, the optical fiber with 60 μ m cladding diameters can coil around bobbin shown in Figure 6 20 as high non-linearity fiber 10 and with 400m length, to make module.In the case, consider the coiling distortion of high non-linearity fiber 10, will coil diameter, i.e. the inner diameter d of bobbin 20
2Be set at 30mm.Bobbin 20 has following shape, wherein with the outside diameter d of the collar part 20b of bobbin 20
1Be set at 55mm, the inner width W between the two collar part 20b is set at 5mm, and with the width W of collar part 20b
1Be set at 1mm.
As shown in Figure 7, an end fusion that will have a single-mode fiber 21 of 80 μ m cladding diameters is engaged in the two ends that form eiloid high non-linearity fiber 10.Then, coil is contained in the framework 23, wherein chuck 22 is connected in other ends of single-mode fiber 21.
Thereby, make the high non-linearity optical module (HNLM) that has from the single-mode fiber of chuck extraction.
As mentioned above, the splice-losses in the fusion with the high non-linearity fiber 10 with 60 μ m cladding diameters engages can have the single-mode fiber 21 of 80 μ m cladding diameters and successfully be controlled to be 0.1 decibel or littler by use.
Consider the simplicity of using optical fiber, adopt single-mode fiber 21 with 105 μ m cladding diameters.Splice-losses during the fusion that will have the single-mode fiber 21 of 105 μ m cladding diameters and have a high non-linearity fiber 10 of 60 μ m cladding diameters engages successfully is controlled to be 0.2 decibel or littler.The single mode fibre with 125 μ m cladding diameters that links to each other with connector can be connected in this module and use this single mode fibre.It should be noted that and the internal diameter of bobbin can be set at 20-40mm, and its inner width is set at 5-10mm.
Because the size of bobbin 20 reduces as mentioned above, so also module size can be reduced to 60mm on length, be reduced to 90mm and in height be reduced to 10mm on width.
In above-mentioned first and second examples, can change axle collar width d by application according to module
1And the contrast between the inner width W, and the size of change bobbin 20, wherein high non-linearity fiber 10 is around this bobbin coiling.
The size of bobbin 20 as shown in Figure 6 depends on the volume of optical fiber and the number percent in space thereof.In this explanation, the coating diameter of optical fiber is set at 100-250 μ m, and the number percent in space is fixed on 65% basically.Thereby the size of bobbin 20 depends on the volume of optical fiber.
Relation between fiber volume (fibre length and coating diameter) and the bobbin size is represented by equation (6).In equation (6), L is a fibre length, d
fIt is coating diameter.
L＝650W×{(d
1-d
2)
2-d
2 2/d
f 2}×π (6)
Obtain equation (7) by equation (6).
It should be noted that if the fiber reel coiled is had and axle collar diameter d
1Identical diameter, coiling will be subsided.Thereby, in axle collar diameter d
1And need variant slightly between the coiling diameter of optical fiber.This species diversity of diameter is by nargin d
sDetermine.Nargin d
sBe preferably 2-10mm, to prevent that fiber reel is around subsiding and realizing reducing of size of components.Thereby, consider nargin d
s, preferably, axle collar diameter d
1Satisfy following relational expression.
When using relational expression (8), small-sized bobbin has following as the size shown in the sample table.
For example, when L is 400m, d
2Be 30mm, W is 5mm, and d
fWhen being 125 μ m, calculate d
1Be 55.1≤d
1≤ 63.1mm.Thereby, can obtain having d less than 60mm
1Bobbin.In addition, when L is 400m, d
2Be 30mm, W is 10mm, and d
fWhen being 125 μ m, calculate d
1Be 45.1≤d
1≤ 53.1mm.Thereby, can obtain having d less than 50mm
1Bobbin.In addition, when L is 400m, d
2Be 30mm, W is 20mm, and d
fWhen being 125 μ m, calculate d
1Be 39.2≤d
2≤ 47.2mm.Thereby, can obtain having d less than 45mm
1Bobbin.
When the optical fiber with 125 μ m coating diameters coils with 400m length,, can inner width be reduced to 15mm and axle collar diameter is reduced to 5mm from above-mentioned size as the size of bobbin with 45mm internal diameter.In addition, as the size of bobbin, can inner width be reduced to 15mm and axle collar diameter is reduced to 45mm from above-mentioned size with 30mm internal diameter.
In the module that adopts the high non-linearity fiber, used fibre length is to set according to the application of the parameter of optical fiber and module.For fixed fiber stably, when employing has the optical fiber of predetermined length, go forward side by side to exercise around the bobbin coiled fiber and use.Yet, when optical fiber very in short-term, be not always to need bobbin.Below as the 3rd example, illustrated and do not used bobbin and module by fiber reel coiled ringed line cast is made.
Fig. 8 does not use bobbin and synoptic diagram by module that high non-linearity fiber disc coiled ringed line cast is formed.
At first, adopt the high non-linearity fiber 10 with 80 μ m cladding diameters shown in Figure 1 to be coiled into the ringed line cast, to make module as the high non-linearity fiber and with 100m length.Consider reliability, the internal diameter of annulus 30 is set at 45mm.It should be noted that by constraint instrument 31 and prevent that annulus 30 from moving up and down.
End with single-mode fiber 32 of 80 μ m cladding diameters utilizes the fusion joint method to engage with the two ends of the high non-linearity fiber 10 that is coiled into the ringed line cast.Cyclic coil high non-linearity fiber 10 also is contained in it in framework 34 by following state, and wherein chuck (connector) 33 is connected in other ends of single-mode fiber 32.Thereby, make the high non-linearity module that has from the single-mode fiber 32 of chuck extraction.
Splice-losses in the fusion with the high non-linearity fiber 10 with 60 μ m cladding diameters engages can have the single-mode fiber 32 of 80 μ m cladding diameters and successfully be controlled to be 0.1 decibel or littler by use.Also single-mode fiber 32 can be suitably be connected in owing to have the high non-linearity fiber 10 of 80 μ m cladding diameters, thereby single-mode fiber 32 can be used with 105 μ m cladding diameters with 105 μ m cladding diameters.The single-mode fiber with 125 μ m cladding diameters that links to each other with connector can be connected in this module and use single-mode fiber.It should be noted that and the internal diameter of this ring can be set at 20-60mm.
In the 4th example, at first, adopt optical fiber as shown in Figure 1 to be coiled into the ringed line cast, to make module as highly nonlinear optical fiber and with 100m length with 60 μ m cladding diameters.Consider reliability, the internal diameter of annulus is set at 30mm.
End fusion with single-mode fiber 32 of 80 μ m cladding diameters is engaged in the two ends of the high non-linearity fiber 10 that is coiled into the ringed line cast.This coil is contained in the framework by following state, and wherein chuck is connected in other ends of single-mode fiber 32.Thereby, make the high non-linearity module that has from the single-mode fiber of chuck extraction.
Splice-losses in the fusion with the high non-linearity fiber 10 with 60 μ m cladding diameters engages can have the single-mode fiber 32 of 80 μ m cladding diameters and successfully be controlled to be 0.1 decibel or littler by use.The single-mode fiber that links to each other with connector can be connected in this module and use single-mode fiber.It should be noted that and the internal diameter of this ring can be set at 20-40mm.
In the 5th example, the optical fiber with 60 μ m cladding diameters as high non-linearity fiber 10 and with 400m length around as shown in Figure 6 bobbin 20 coilings, to make module.To coil diameter, i.e. the inner diameter d of bobbin 20
2Be set at 15mm.Bobbin 20 has following shape, is about to the outside diameter d of bobbin 20 axis ring portion 20b
1Be set at 50mm, the inner width W between the collar part 20b is set at 4.5mm, and with the width W of collar part 20b
1Be set at 0.5mm.
End fusion with single-mode fiber of 125 μ m cladding diameters is engaged in the two ends that form eiloid high non-linearity fiber 10.Then, this coil is contained in the framework by following state, wherein connector is connected in other ends of single-mode fiber.Thereby, make high non-linearity module (HNLM) with connector connection single-mode fiber thereon.
When the difference between the 125 μ m cladding diameters of the cladding diameter of high non-linearity fiber 10 and conventional single mode fiber increases, the just extremely difficult splice-losses of fusion in engaging that reduce.
In fusion fiber optic splicing process, the end face of optical fiber is heated under the situation that end face docks each other, with fusing and connection optical fiber.If the cladding diameter difference of optical fiber, the heat of unit volume that puts on each optical fiber is also just different.Thereby if put on the optical fiber that the heat of optical fiber is suitable for having big cladding diameter, the optical fiber that then has less cladding diameter evaporates with regard to being completely melted.
On the other hand, if heat is suitable for having the optical fiber of less cladding diameter, then put on have larger-diameter optical fiber shortage of heat suitably to melt this optical fiber.Consequently, can not suitably engage these optical fiber.Because the high non-linearity fiber with 60 μ m cladding diameters described in the 5th example has visibly different glass volume with the single-mode fiber with 125 μ m cladding diameters, thereby high non-linearity fiber and single-mode fiber suitably can not be coupled together under usual conditions.Thereby, regulate the fusion engaging condition in the following manner, thereby the optical fiber with 60 μ m cladding diameters can not evaporate in engaging process, this optical fiber and the single-mode fiber with 125 μ m cladding diameters can be joined together.
1) strength of discharge is set very low.
2) will get very short from beginning discharge time set between optical fiber docks each other.
3) after docking optical fiber each other, more in depth promote optical fiber toward each other, have the optical fiber of 60 μ m cladding diameters to prevent to crush.
4) will set discharge time very shortly.
In fusion engages, in the 5th example splice-losses successfully is controlled to be 0.3 decibel or littler.Owing to reduce the size of bobbin 20 as mentioned above, can successfully module size be reduced to 55mm on length, on width, be reduced to 85mm, in height be reduced to 7.5mm.
In the 6th example, adopt high non-linearity fiber 10 to be coiled into the ringed line cast, to make module as the high non-linearity fiber and with 100m length with 60 μ m cladding diameters.The internal diameter of this ring is set at 15mm.
The one end fusion that will have the single-mode fiber of 125 μ m cladding diameters is engaged in the two ends of the high non-linearity fiber 10 that forms the ringed line cast.Then, this coil is contained in the framework by following state, wherein connector is connected in other ends of single-mode fiber.Thereby, make the high non-linearity module that has from the single-mode fiber of connector extraction.
Use the fusion engaging condition described in the 5th example, the splice-losses that will have the fusion joint of the single-mode fiber of 125 μ m cladding diameters and the high non-linearity fiber 10 with 60 μ m cladding diameters successfully is controlled to be 0.3 decibel or littler.
The reduction of the coiling diameter appreciable impact fiber optic coils size of optical fiber.In other words, because the coiling distortion and the cladding diameter of optical fiber are proportional, thus can be by reducing the coiling diameter that cladding diameter reduces optical fiber, console panel is around the increase of distortion simultaneously.This is favourable for the size that reduces coil.When normally used optical fiber with 125 μ m cladding diameters coils with the 60mm internal diameter, the probability of the fatigure failure of optical fiber is about 0.25%/20 year.Fatigure failure is provided by following equation (11).
λ＝α×N
p×{(β
p/E
2)/(B/E
2)
β}×{(ε
n×t)
β/(ε
p np×t
p)} (11)
At this, n
pBe the endurance ratio of optical fiber under the shielding environment, n is the endurance ratio of optical fiber under environment for use, ε
pBe at shield test reactor time institute stress application, ε is institute's stress application under environment for use, t
pBe the stress application ε of institute
pThe time that is applied in, t is the time that the stress application ε of institute is applied in, N
pBe the number of times of the fatigure failure of per unit length when shield test reactor, m is the Weibull distribution coefficient, and α is m/ (n
p-2), β is (n
p-2)/(n-2), (β
p/ E
2)/(B/E
2) β is the constant of being determined by environment, E is the elastic modulus of optical fiber, B is a constant, B
pBe the B in the shield test reactor atmosphere, and λ is the probability of fatigure failure.
The major parameter relevant with the characteristic of optical fiber is m and n in this expression formula
pProbability of fatigue failure is being carried out in the calculation process, " 20 " described in the internationally recognized Telcordia GR-20-CORE are being used as n
p, as m,, and will make the stress levels of optic fibre extension 1% be used as ε because m is about 3 to 6 usually with " 3 "
p
Under the situation of the optical fiber with 60 μ m cladding diameters, when optical fiber coiled with the 30mm internal diameter, the probability that utilizes identical parameters to calculate fatigure failure was 0.25%/20 year.Thereby this internal diameter is applied in second example and the 4th example.The m and the n that are used for the high non-linearity fiber with 60 μ m cladding diameters of second example when measurement
pThe time, n and n
pBe respectively " 1.2 " and " 27 ".If with ε
pWhen being set at the stress levels that makes optic fibre extension 1%, can guarantee reliability simultaneously with 20mm internal diameter coiled fiber.When with ε
pWhen being set at the stress levels that makes optic fibre extension 2%, can be with 12mm internal diameter coiled fiber.When with ε
pWhen being set at the stress levels that makes optic fibre extension 2.1%, can be with 10mm internal diameter coiled fiber.Based on above result, in the 5th example and the 6th example, adopt the 15mm internal diameter.
As mentioned above, according to present embodiment, the usefulness optical fiber with the segment type distribution of W portion as shown in Figure 1 is as the high non-linearity fiber.Yet the high non-linearity fiber is not limited thereto.Can adopt the optical fiber of structure as shown in Figure 9, wherein refractive index has the distribution of W type.
In Fig. 9, high non-linearity fiber 40 comprises: a that has that comprises optical axis center
1First fibre core 41 of μ m diameter is around the b that has of first fibre core 41
1Second fibre core 42 of μ m diameter is around the covering 43 of second fibre core 42.First fibre core 41 and second fibre core 42 and covering 43 are by for example silicon dioxide (SiO
2) sill formation.With the diameter of covering 43, promptly cladding diameter is set for little of for example 40-70 or 40-80 μ m.
First fibre core 41 forms with to SiO
2Mix scheduled volume GeO as adulterant
2And has n
C11Largest refractive index.Second fibre core 42 is formed by a kind of material, and this material has the refractive index that is lower than covering 43 and with for example to SiO
2Mix scheduled volume F and have n
C22Minimum refractive index.
Covering 43 has refractive index n
C0And generally basically by pure SiO
2Form.Yet, also can mix F to covering 43.
Respective indices of refraction n with first fibre core 41, second fibre core 42 and covering 43
C11, n
C22And n
C0Be set at and have n
C11＞n
C0＞n
C22Relation.The index distribution of this type optical fiber 40 is called the W type.
Refractive index contrast is expressed as follows in the distribution shown in Fig. 9.Refractive index n at covering 43
C0The basis on, calculate the refractive index contrast Δ 11 of first fibre core 41 by equation (9), and calculate the refractive index contrast Δ 22 of second fibre core 42 by equation (10).
Δ11＝{(n
c11-n
c0)/n
c11}×100％ (9)
Δ22＝{(n
c22-n
c0)/n
c22}×100％ (10)
When optical fiber was as shown in Figure 9 made the high non-linearity fiber, table 4-6 illustrated the key property of this high non-linearity fiber.
Table 4
Δ11：2.8％ Δ22：-0.55％、a
1/b
1：0.6、b
1：6.7μm
| Fibre length | km | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Fibre diameter | μm | 80 | 70 | 60 | 50 | 40 |
| Coating diameter | μm | 128 | 127 | 125 | 124 | 123 |
| Loss (1550nm) | dB/km | 0.93 | 0.86 | 0.84 | 0.83 | 0.82 |
| Dispersion values (1550nm) | ps/(nm·km) | 0.09 | 0.87 | 0.11 | 1.02 | 0.25 |
| Chromatic dispersion gradient (1550nm) | ps/(nm 2·km) | 0.017 | 0.017 | 0.016 | 0.018 | 0.024 |
| λ 0 | nm | 1544.7 | 1500.2 | 1543.5 | 1491.5 | 1539.7 |
| Cutoff wavelength | nm | 1436 | 1370 | 1433 | 1383 | 1424 |
| MFD(1550nm) | μm | 4.1 | 4.0 | 4.1 | 4.1 | 4.2 |
| Aeff(1550nm) | μm 2 | 11.1 | 11.3 | 11.4 | 11.2 | 11.8 |
| PMD | ps/km 1/2 | 0.08 | 0.08 | 0.11 | 0.05 | 0.12 |
| Bending loss (Φ 20nm, 1550nm) | dB/m | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 |
| γ | l/W/km | 19.0 | 20.9 | 19.6 | 17.9 | 18.3 |
Table 5
Δ11：2.8％ Δ22：-1.0％、a
1/b
1：0.4、b
1：9.1μm
| Fibre length | km | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Fibre diameter | μm | 80 | 70 | 60 | 50 | 40 |
| Coating diameter | μm | 128 | 126 | 125 | 123 | 122 |
| Loss (1550nm) | dB/km | 1.29 | 1.18 | 1.10 | 1.09 | 1.06 |
| Dispersion values (1550nm) | ps/(nm·km) | -0.56 | -0.08 | -0.18 | 1.12 | 0.24 |
| Chromatic dispersion gradient (1550nm) | ps/(nm 2·km) | 0.011 | 0.011 | 0.010 | 0.014 | 0.010 |
| λ 0 | nm | 1603.5 | 1557.0 | 1567.5 | 1467.4 | 1525.7 |
| Cutoff wavelength | nm | 1370 | 1354 | 1239 | 1224 | 1359 |
| MFD(1550nm) | μm | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
| Aeff(1550nm) | μm 2 | 10.3 | 10.1 | 10.2 | 10.3 | 10.2 |
| PMD | ps/km 1/2 | 0.13 | 0.13 | 0.03 | 0.01 | 0.02 |
| Bending loss (Φ 20nm, 1550nm) | dB/m | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 |
| γ | l/W/km | 22.5 | 24.6 | 22.5 | 24.5 | 23.3 |
Table 6
Δ1：2.0％ Δ2：-0.55％、a
1/b
1：0.57、b
1：7.8μm
| Fibre length | km | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Fibre diameter | μm | 80 | 70 | 60 | 50 | 40 |
| Coating diameter | μm | 127 | 126 | 125 | 123 | 123 |
| Loss (1550nm) | dB/km | 0.39 | 0.38 | 0.35 | 0.35 | 0.35 |
| Dispersion values (1550nm) | ps/(nm·km) | -0.28 | 0.13 | 0.16 | 0.18 | -0.18 |
| Chromatic dispersion gradient (1550nm) | ps/(nm 2·km) | 0.023 | 0.023 | 0.017 | 0.018 | 0.008 |
| λ 0 | nm | 1562.0 | 1544.3 | 1540.6 | 1540.3 | 1573.5 |
| Cutoff wavelength | nm | 1195 | 1190 | 1160 | 1217 | 1110 |
| MFD(1550nm) | μm | 4.4 | 4.4 | 4.7 | 4.4 | 4.7 |
| Aeff(1550nm) | μm 2 | 14.4 | 13.6 | 14.8 | 14.1 | 14.6 |
| PMD | ps/km 1/2 | 0.13 | 0.04 | 0.02 | 0.06 | 0.03 |
| Bending loss (Φ 20nm, 1550nm) | dB/m | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 | ＜0.01 |
| γ | l/W/km | 12.2 | 12.8 | 11.1 | 12.4 | 11.9 |
As mentioned above, the diameter with coating is set at 125 μ m ± 5%.This makes can provide the high non-linearity fiber, when with this high non-linearity fiber disc coiled coil shape, it can form very little size, and when passing through release coating and exposing covering, and it can improve the connectivity with the optical fiber with 125 μ m cladding diameters that is used to be connected verifying attachment.In addition, can provide the high non-linearity fibre module that adopts this high non-linearity fiber.
Though describe the present invention in conjunction with specific embodiments to carry out fully with clearly open, but claims are not to be restricted therefrom, and be construed as, it comprises and falls into all modification and the optional structure that those skilled in the art can relate in the said basic teachings fully.
Claims (17)
1. highly nonlinear optical fiber comprises:
Fibre core;
Covering around fibre core; And
Cover the coating of covering, wherein
With after the bending of 20mm bending diameter on the 1550nm wavelength bending loss be equal to or less than 0.01dB/m,
Nonlinear factor is equal to or greater than 10W on the 1550nm wavelength
-1Km
-1,
Cutoff wavelength is equal to or less than 1530nm,
Zero-dispersion wavelength is in the scope between 1400nm and the 1650nm, and
The diameter of coating is 125 μ m, it has ± and 5% tolerance.
2. highly nonlinear optical fiber as claimed in claim 1, the diameter of its floating coat are the 95%-105% for the diameter that carries out the illusory fibre cladding that attribute inspection connects.
3. highly nonlinear optical fiber as claimed in claim 1, wherein the diameter of covering is in the scope between 40 μ m and the 80 μ m.
4. highly nonlinear optical fiber as claimed in claim 1, wherein the diameter of covering is in the scope between 40 μ m and the 70 μ m.
5. high non-linearity fiber as claimed in claim 1, wherein
Fibre core comprises
First fibre core, it is positioned at the center, has first refractive index; With
Second fibre core, it has second refractive index around first fibre core, and
Covering has the third reflect rate, and this third reflect rate is lower than first refractive index and is higher than second refractive index, and
Second fibre core is equal to or less than-0.3% with respect to the refractive index contrast of covering.
6. highly nonlinear optical fiber as claimed in claim 5, wherein fibre core also comprises the 3rd fibre core between second fibre core and the covering, and the 3rd fibre core has the fourth reflect rate, and this fourth reflect rate is lower than first refractive index and is higher than the third reflect rate.
7. highly nonlinear optical fiber module, it comprises highly nonlinear optical fiber, this highly nonlinear optical fiber comprises fibre core, around the covering of fibre core and the coating that covers covering, wherein
With after the bending of 20mm bending diameter on the 1550nm wavelength bending loss be equal to or less than 0.01dB/m,
Nonlinear factor is equal to or greater than 10W on the 1550nm wavelength
-1Km
-1,
Cutoff wavelength is equal to or less than 1530nm,
Zero-dispersion wavelength is in the scope between 1400nm and the 1650nm, and
The diameter of coating is 125 μ m, it has ± and 5% tolerance.
8. highly nonlinear optical fiber module as claimed in claim 7, wherein
Single mode fibre is connected in the two ends of highly nonlinear optical fiber, and
The cladding diameter of this single mode fibre is in the scope between 80 μ m and the 130 μ m.
9. highly nonlinear optical fiber module as claimed in claim 7, wherein
Single mode fibre is connected in the two ends of highly nonlinear optical fiber, and
The cladding diameter of this single mode fibre is in the scope between 120 μ m and the 130 μ m.
10. highly nonlinear optical fiber module as claimed in claim 7, wherein
Single mode fibre is connected in the two ends of highly nonlinear optical fiber, and
The cladding diameter of this single mode fibre is in the scope between 80 μ m and the 105 μ m.
11. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber coils around bobbin, and
The external diameter of bobbin satisfies
D wherein
1Be the external diameter of bobbin, L is the length of highly nonlinear optical fiber, and W is the inner width between the axle collar of bobbin, d
2Be the internal diameter of bobbin, and d
fIt is the diameter of coating.
12. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber coils around bobbin, and
The internal diameter of bobbin is in the scope between 10mm and the 60mm.
13. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber coils around bobbin, and
The internal diameter of bobbin is in the scope between 10mm and the 40mm.
14. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber coils around bobbin, and
Inner width between the axle collar of bobbin is in the scope between 4mm and the 20mm.
15. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber coils around bobbin, and
Inner width between the axle collar of bobbin is in the scope between 4mm and the 10mm.
16. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber is coiled into the annulus shape, and
The internal diameter of this annulus shape is in the scope between 10mm and the 60mm.
17. highly nonlinear optical fiber module as claimed in claim 7, wherein
Highly nonlinear optical fiber is coiled into the annulus shape, and
The internal diameter of this annulus shape is in the scope between 10mm and the 40mm.
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| CN109155499A (en) * | 2016-05-13 | 2019-01-04 | 康宁股份有限公司 | Optics tube waveguide emits laser medium and associated method |
| CN106772781A (en) * | 2017-01-12 | 2017-05-31 | 烽火通信科技股份有限公司 | A kind of bend insensitive optical fiber made suitable for the joints of optical fibre |
| CN106772781B (en) * | 2017-01-12 | 2019-06-21 | 烽火通信科技股份有限公司 | A kind of bend insensitive optical fiber suitable for optical fiber connector production |
| CN112513700A (en) * | 2018-08-24 | 2021-03-16 | 住友电气工业株式会社 | Optical fiber circuit, module, and optical fiber circuit manufacturing method |
| CN112513700B (en) * | 2018-08-24 | 2022-10-28 | 住友电气工业株式会社 | Optical fiber circuit, module, and optical fiber circuit manufacturing method |
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