CN1268952C - Chromatic dispersion optimized light-guide fiber with larger luminous spot area - Google Patents
Chromatic dispersion optimized light-guide fiber with larger luminous spot area Download PDFInfo
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- CN1268952C CN1268952C CNB2004100033590A CN200410003359A CN1268952C CN 1268952 C CN1268952 C CN 1268952C CN B2004100033590 A CNB2004100033590 A CN B2004100033590A CN 200410003359 A CN200410003359 A CN 200410003359A CN 1268952 C CN1268952 C CN 1268952C
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Abstract
A chromatic dispersion optimized light-guide fiber is provided with a larger luminous spot area which includes a center core area, a covering area, a ring core area and an outer glass area, wherein the covering area is provided at periphery of the center core area, the ring core area is provided at periphery of the covering area, the outer glass area surrounds the ring core area. The refractive index of the center core area and the ring core area is higher than that of the outer glass area, the refractive index of the covering area is lower than that of the outer glass area, and the refractive index is limited by a formula n1>n3>n4>n2. According to a preferable embodiment, the covering area is divided into two areas: an inner covering area and an outer covering region, the ring core area is arranged between the two. The inner covering area is provided at periphery of the outer covering area, the outer covering area is provided at periphery of the ring core area, and the outer glass area surrounds the outer covering area, and the the refractive index is limited by a formula n1>n3>n5>n2=n4.
Description
Technical field
The present invention relates to a kind of light transmitting fiber, especially relate to and a kind ofly produce having low dispersity, hanging down the chromatic dispersion optimized light-guide light transmitting fiber of dispersive power and high bright spot area of low dispersive power and efficient district at 1530～1565nm (C-band) and 1565～1625nm (L-band) with low dispersity, low dispersive power and high bright spot area; More particularly it relates to a kind of chromatic dispersion optimized light-guide light transmitting fiber of single-mode, this light transmitting fiber is suitable for the multichannel of high bandwidth by long Distance Transmission, have more uniform chromatic dispersion and pass through the transmission of third and fourth window with low power density, also have the mode field of optimization diameter, can have low bend induced loss at wavelength 1550nm and more crucial wavelength 1625nm place.
Background technology
Recently during the last ten years, light transmitting fiber grows up and backbone has been installed for audio frequency, video and the data transmission of interoffice network; Because the continuous increase and the expansion of remote communications facilities, fibre-optic importance progressively shows; Because they have high bandwidth adaptability its importance are further increased; Because the needs that infotech develops rapidly bandwidth will further increase by index law ground in time.
Worldwide, the optical communication of offered load just increases on explosion type ground; Owing to adopt intensive wave band zonal coding device of new generation (DWDM) can satisfy ever-increasing broadband demand, yet this of new generation intensive wave band zonal coding device that in 1530～1565nm (C-band) and 1565～1625nm (L-band) wavelength coverage, uses low chromatic dispersion single mode optical fibre, below be referred to as DWDM, need to use the light transmitting fiber that can support this intensive wave band zonal coding device (DWDM), the light transmitting fiber that particularly requires to use has high bright spot area and consistent (slope) chromatic dispersion at relevant wave band; By increase band channel quantity in the regulation wave band, DWDM can increase the fibre-optic valid data transfer rate of use.
The 850nm wave band multi-mode light transmitting fiber that tradition is used is progressively replaced by the zero chromatic dispersion single mode optical fibre at about 1310nm wave band, and single mode or single-mode light transmitting fiber have wideer wave band adaptability than traditional multi-mode light transmitting fiber.
Because this single mode optical fibre has low decay in 1300～1550nm wavelength band, therefore need develop this single mode optical fibre.
Yet in order to reduce decay, when single mode optical fibre passed through the 1550nm wave band, test showed that this single mode optical fibre has higher chromatic dispersion.
The major defect of existing single mode optical fibre is to have higher chromatic dispersion at the 1550nm wave band, and reason is that this light transmitting fiber hinders in high bit speed; This shortcoming of single mode optical fibre can be referred to as chromatic dispersion by use and shift fibre-optic improvement single-mode light transmitting fiber solution, shifts when passing through even carry out the 1550nm wave band, and this improvement single-mode light transmitting fiber can have zero chromatic dispersion.
Theoretical analysis shows that the low chromatic dispersion with efficient area and the single mode optical fibre of low-dispersion slope are suitable for above-mentioned high power capacity DWDM device communication most, yet, in the former technological operation, the chromatic dispersion transfer light transmitting fiber that is used for long haul transmission system has higher chromatic dispersion, therefore causes DWDM apparatus system poor-performing; And straight chromatic dispersion light transmitting fiber has less than 2ps/nm.km dispersion magnitude deviation in 1.3～1.6 mu m waveband scopes, and has zero chromatic dispersion at DWDM device regulation wave band, therefore can carry out four wave bands and mix use, thereby have good DWDM device performance.
Desirable light transmitting fiber chromatic dispersion should have a constant value within whole regulation wavelength band; Yet, owing to refractive index along with wavelength variations changes, light transmitting fiber chromatic dispersion numerical value also changes along with wavelength variations; Chromatic dispersion gradient coefficient S o represents this variability, and the chromatic dispersion gradient coefficient is low more, along with the wavelength dispersion amplitude of variation is more little; Low fibre-optic another advantage of chromatic dispersion low-dispersion slope is to have low chromatic dispersion, can suppress non-linear four wave bands by a minimum dispersion variation and mix; That is to say,, just can finish long range signals and transmit needed minimum chromatic dispersion and dispersion slope compensation by using the low dispersion variation of a regulation.
Test shows that bandwidth or lightwave system capacity can be expanded by following several method: A) increase light transmitting fiber regulation wave band (DWDM device) quantity; B) carry out communication (adopting a plurality of time zonal coding devices) by very fast transmission speed; Perhaps C) use light transmitting fiber quantity within the optical cable by increasing, yet the rated power of image intensifer has limited the maximum quantity that light transmitting fiber uses within the optical cable.
In fact, communication device system can be determined transmission performance curve, thereby the light transmitting fiber in the apparatus system twines and to become most important, as mentioned above, should control the light transmitting fiber performance, particularly the light transmitting fiber chromatic dispersion must be satisfied balance requirement between compensation requirement and the nonlinear effect; Its active zone must be enough big, thereby under the prerequisite that does not influence the light transmitting fiber performance, reduce nonlinear effect; And the light transmitting fiber chromatic dispersion gradient must be enough little, thereby can for example reduce the internal channel gap, and for example within the predetermined bits speed range, all channels transmit with an extremely low error.
Because light transmitting fiber need satisfy more and more higher requirement, the designer need further consider and optimize the transmission coefficient curve how again, like this, may need to adopt complicated more design; Yet somewhat complex design is highstrung for manufacturing process.Because the cable material physical property has limited the overall performance that obtains above-mentioned requirements light transmitting fiber performance, in actual final products, just each optimizes the compromise of performance, promptly not influencing under the prerequisite that system and device uses and the key parameter regulation requires, each parameter is optimized; And, carry out the sensory system modelling by analyzing each different parameters and influence thereof.
Major parameter, for example: each part of light transmitting fiber comprises the reflectivity of central core, coating, ring core and outer core and relation and core quantity and the coating quantity between radius size and each partial reflectance of light transmitting fiber and the radius, can determine to use fibre-optic performance characteristic and usability.
Therefore, existing technology light transmitting fiber can be distinguished by its characteristic parameter, and can determine by using above major parameter; The light transmitting fiber of explained hereafter in the past, but has the low non-linear high bending loses that has, perhaps have low bending loses but have and hang down active zone, perhaps may have high non-linear and high bending loses, perhaps not have consistent chromatic dispersion or have high chromatic dispersion gradient at the third and fourth window wave band; That is to say that former light transmitting fiber does not have optimize performance, in order to obtain a certain regulation performance, may be to sacrifice another performance index as cost.
Test shows that light transmitting fiber chromatic dispersion and chromatic dispersion gradient change along with wave band, and reflectivity is along with changing by wavelength variations.
Has the light transmitting fiber of optimizing chromatic dispersion, optimizing chromatic dispersion gradient and regulation bright spot area in order to develop, need to consider that light transmitting fiber chromatic dispersion and chromatic dispersion gradient change along with wave band and reflectivity has constant value as far as possible along with the variation of wavelength variations, thereby relatively easily obtain the reflection parameters curve and satisfy requirement is set, and the corresponding photoconduction fiber product that within wide as far as possible wavelength band, uses.
Therefore, the present inventor attempts developing the light transmitting fiber with complex optimum performance, that is to say, such light transmitting fiber need be in order not obtain a certain regulation performance, and to sacrifice another performance index as cost.
The needs of invention
Therefore, the light transmitting fiber that needs a kind of chromatic dispersion of exploitation and useful area to optimize, particularly a kind of light transmitting fiber that has alap chromatic dispersion gradient and high useful area when in 1530～1565nm (C-band) and 1565～1625nm (L-band) wavelength coverage, transmitting.Especially, need to develop a kind of being suitable for long apart from the inner width band transmission, and have the homogeneous chromatic dispersion and have high useful area at the third and fourth window wave band, thereby can have a low bending loss at 1550nm wave band and the crucial wave band of 1625nm.
Summary of the invention
The purpose of invention
Correspondingly, an object of the present invention is to provide a kind of low chromatic dispersion and low-dispersion slope light transmitting fiber, particularly at 1530～1565nm wave band.
Another object of the present invention provides a kind of low chromatic dispersion and low-dispersion slope light transmitting fiber of suitable long Distance Transmission.
Another object of the present invention is to provide a kind of 1550nm wave band to have the light transmitting fiber of higher useful area, and this light transmitting fiber have the cutoff wavelength of optimization and corresponding modes field diameter.
The present invention also has another purpose to provide a kind of light transmitting fiber, and this light transmitting fiber not only has very high bending ability, and has and at utmost reduce nonlinear optimum chromatic dispersion.
By reading, to those skilled in the art, find that other purpose of the present invention and preferred embodiment will be conspicuous below in conjunction with the accompanying drawing description of this invention.The content of accompanying drawing is not construed as limiting the invention.
Description of the invention and character
Carry out design implementation according to main design parameters of the present invention and analysis explanation, can find, the shortcoming and defect of technology light transmitting fiber product can have a kind of novel light transmitting fiber solution of 1.8～6.0ps/nm.km and 4.0～11ps/nm.km chromatic dispersion respectively by using at 1530～1565nm (C-wave band) and at 1565～1625nm (L-wave band) in the past, and had useful area and a 0.075ps/nm of typical case's 72 square microns within described wavelength band
2.km minimum chromatic dispersion gradient; Therefore, the present invention has disclosed a kind of novel light transmitting fiber with such refractive index curve and setting, this light transmitting fiber not only can obtain easily, and carry out processing and manufacturing easily, and this light transmitting fiber have corresponding chromatic dispersion, useful area and chromatic dispersion gradient feature in specialized range or regulation numerical value interval.
Correspondingly, the present invention relates to a kind of chromatic dispersion optimized light-guide light transmitting fiber with higher bright spot area, this light transmitting fiber comprises a center core area, a coating district, a ring core district and an outer glass district, wherein central core and ring core district have the refractive index higher than outer glass district, and the coating district has the refractive index lower than outer glass district, and the relation between these refractive indexes is shown in following formula:
n1＞n3＞n4＞n2
Carry out the setting of respective indices of refraction numerical value according to following formula, can create the light transmitting fiber that in C-band and L-band transmission course, has low-dispersion slope, hangs down chromatic dispersion and high useful area:
0.008＞(n1-n4)＞0.007
0.0018＞(n3-n4)＞0.0014
-0.0005＞(n2-n4)＞-0.0007
Wherein: n1, n2, n3 and n4 represent the refractive index in center core area 1, coating district 2, ring core district 3 and outer glass district 4 respectively.
The invention still further relates to a kind of chromatic dispersion optimized light-guide light transmitting fiber with higher bright spot area, this light transmitting fiber comprises a center core area, an inner coating district, an outside coating district, a ring core district and an outer glass district, wherein central core and ring core district have the refractive index higher than outer glass district, and inner coating district and outside coating district have the refractive index lower than outer glass district, and the relation between these refractive indexes is shown in following formula:
n1＞n3＞n4＞n5＝n6
Carry out the setting of respective indices of refraction numerical value according to following formula, can create the light transmitting fiber that in C-band and L-band transmission course, has low-dispersion slope, hangs down chromatic dispersion and high active zone:
0.008＞(n1-n4)＞0.007
0.0018＞(n3-n4)＞0.0014
-0.0005＞(n5-n4)＞-0.0007
-0.0005＞(n6-n4)＞-0.0007
Wherein: n1, n5, n3, n6 and n4 represent the refractive index in center core area 1, inner coating district 5, ring core district 3, outside coating district 6 and outer glass district 4 respectively.
Except various purposes listed above and advantage, be not listed in the accompanying drawing part of claim for those skilled in the art by reading the present invention, can become apparent finding to disclose various other purpose and various embodiment advantage of the present invention here.
Description of drawings
By using description of drawings, can help to understand character of the present invention; These accompanying drawings show the present invention and most preferred embodiment thereof, and these accompanying drawings are not within claim protection domain of the present invention by the form of certain view; Yet implementation result of the present invention is subjected to the index of refraction relationship formula of fibre-optic various parts radiuses of following further description of drawings and/or various parts and the restriction that reflects numerical value separately.
Fig. 1 shows the fibre-optic key feature synoptic diagram of the present invention.
Fig. 2 a shows a cut-open view of the fibre-optic specific embodiment of the present invention as shown in Figure 1.
Fig. 2 b shows the fibre-optic refractive index curve as the described the present invention of Fig. 2 a.
Fig. 3 shows along the diametric intensity distribution of light transmitting fiber shown in Fig. 2 a of the present invention.
Fig. 4 a shows a cut-open view of fibre-optic another specific embodiment of the present invention as shown in Figure 1.
Fig. 4 b shows to have fibre-optic refractive index curve shown in Fig. 4 a.
Fig. 5 shows along the diametric intensity distribution of light transmitting fiber shown in Fig. 4 a of the present invention.
Fig. 6 shows the dispersion profile figure of fibre-optic waveguide dispersion direction shown in Fig. 2 a and 4a.
Embodiment
Detailed description of the invention
According to first embodiment of the invention, illustrated light transmitting fiber comprises four districts, center core area 1, coating district 2, ring core district 3 and outer glass district 4.Shown in accompanying drawing 2a, light transmitting fiber comprises a center core area 1, coating district 2, a ring core district 3 and an outer glass district 4; Wherein coating district 2 can stipulate to be arranged on the outer of central core 1 and places, ring core 3 can be defined in coating district 2 outer place and outer glass district 4 be looped around ring core district 3 around (can be a) referring to Fig. 2.
According to this embodiment of the present invention, center core area 1 and ring core district 3 have the refractive index higher than outer glass district 4, and coating district 2 has the refractive index lower than outer glass district 4, (relation between these refractive indexes can referring to formula 1 and accompanying drawing 2a):
n1＞n3＞n4＞n2(1)
In first embodiment of the invention, for the light transmitting fiber refractive index of same district not, the refractive index in center core area 1, coating district 2, ring core district 3 and outer glass district 4 symbolization n1, n2, n3 and n4 respectively identifies; Carry out the setting of respective indices of refraction numerical value according to following formula 2～4, can create the light transmitting fiber that in C-band and L-band transmission course, has low-dispersion slope, hangs down chromatic dispersion and high useful area:
0.008＞(n1-n4)＞0.007(2)
0.0018＞(n3-n4)＞0.0014(3)
-0.0005＞(n2-n4)＞-0.0007(4)
Disclose in the above embodiment of the invention and in accompanying drawing 2a and 2b illustrated light transmitting fiber insensitive for the situation that little curved loss and chromatic dispersion gradient are not more than 0.08ps/nm2.km.
In first embodiment of the invention shown in accompanying drawing 2a, the light transmitting fiber not refractive index of same district has the index of refraction relationship that the following relationship formula shows in a special embodiment:
(n1-n4)=about 0.007 (5)
(n3-n4)=about 0.0016 (6)
(n2-n4)=about-0.0006 (7)
According to the light transmitting fiber in the first embodiment of the invention (can referring to accompanying drawing 2a), each district's radius can also identify respectively and become center core area 1, coating district 2, ring core district 3 and outer glass district 4, and these district's radiuses can be distinguished symbolization a
1, a
2, a
3And a
4Identify; According to this specific embodiment of the present invention, these district's radiuses can so be selected, promptly in C-band and L-band transmission course, bending loses is within the specialized range, and each district's radius of first embodiment of the invention is subjected to following 8～10 relational expressions restriction:
The about 2.7 μ m (8) of a1=
The about 6.3 μ m (9) of a2=
The about 8.8 μ m (10) of a3=
In the fibre-optic explanation embodiment according to the present invention, refractive index curve is included in the single annular ring that has plating germanium and plating fluorine between a plating germanium center core area 1 and the plating germanium ring core district 3 shown in accompanying drawing 2a be coating district 2; Outer glass district 4 can stipulate to be arranged on outer the placing in plating germanium ring core district 3.According to a first embodiment of the invention, light transmitting fiber has a refractive index curve shown in accompanying drawing 2a, and this fibre-optic each as mentioned above the relative radius of parts have following feature:
Decay≤0.22 at the 1550nm wave band;
Be in 2.2ps/nm.km to 6.0ps/nm.km respectively in 1530nm wave band to the chromatic dispersion of 1565nm wave band;
Be in 4.0ps/nm.km to 11ps/nm.km respectively in 1565nm wave band to the chromatic dispersion of 1625nm wave band;
(typical case) chromatic dispersion gradient is 0.07ps/nm
2.km;
Polarization mode dispersion (PMD)≤0.1ps/km0.5;
Mode field diameter (MFD) is 9.6 ± 0.4 μ m;
Cutoff wavelength (optical cable)≤1280nm;
Core concentric rate＜0.6 μ m;
(typical case) useful area is 70 square microns;
Microcosmic bending (pin grid array)＜0.05dB is at 1550nm wave band and 1625nm wave band;
(changeing in single axle of 32mm and 60mm axle with 100) macrobending＜0.5dB is at 1550nm wave band and 1625nm wave band;
Reception test adopts 100kpsi.
According to second embodiment of the invention, place therebetween by ring core district 3, illustrated fibre-optic coating district 2 can be divided into two coating districts, promptly inner coating district 5 and outside coating district 6, the outer glass district can stipulate to be placed on outer the placing in outside coating district 6, as outer glass district 4; Shown in accompanying drawing 4a, this light transmitting fiber comprises a center core area 1, inner coating district 5, ring core district 3, an outside coating district 6 and an outer glass district 4; Wherein inner coating or first coating district 5 can be defined in the outer of center core area 1 and place, ring core district 3 can stipulate to be placed on inner coating or the outer of first coating district 5 placed, and outside coating district or second coating district 6 can stipulate to be placed on the outer of ring core district 3 and place, and outer glass district 4 can stipulate to be placed on outside coating district or second coating district 6 around (can be a) referring to Fig. 4.
According to second embodiment of the present invention, center core area 1 and ring core district 3 have the refractive index higher than outer glass district 4, and inner coating district 5 and outside coating district 6 have the refractive index lower than outer glass district 4, (relation between these refractive indexes can referring to formula 11 and accompanying drawing 4b); According to the present invention's regulation, the refractive index in inner coating district 5 is identical with the refractive index in outside coating district 6:
n1＞n3＞n4＞n5＝n6(11)
In second embodiment of the invention, for the light transmitting fiber refractive index of same district not, center core area 1 and inner coating district 5 and can stipulate to be placed on ring core district 3 between inner coating district 5 and the outside coating district 6 and the refractive index in outside coating district 5 and outer glass district 4 symbolization n1, n5, n3, n6 and n4 identify respectively; Carry out the setting of respective indices of refraction numerical value according to following relationship formula 12～15, can create the light transmitting fiber that in C-band and L-band transmission course, has low-dispersion slope, hangs down chromatic dispersion and high useful area:
0.008＞(n1-n4)＞0.007(12)
0.0018＞(n3-n4)＞0.0014(13)
-0.0005＞(n5-n4)＞-0.0007(14)
-0.0005＞(n6-n4)＞-0.0007(15)
In above second embodiment of the invention, disclose and be not more than 0.08ps/nm for little curved loss and chromatic dispersion gradient at the light transmitting fiber of accompanying drawing 4a and 4b explanation
2.km situation is insensitive.
In second embodiment of the invention shown in accompanying drawing 4a, the light transmitting fiber not refractive index of same district has the index of refraction relationship that the following relationship formula shows in a special embodiment:
(n1-n4)=about 0.007 (16)
(n3-n4)=about 0.0016 (17)
(n5-n4)=about-0.0006 (18)
(n6-n4)=about-0.0006 (19)
According to the light transmitting fiber in the second embodiment of the invention (can referring to accompanying drawing 4a), center core area 1 and inner coating district 5 and can stipulate to be placed on ring core district 3 between inner coating district 5 and the outside coating district 6, the radius in outside coating district 6 and outer glass district 4 symbolization a1, a5, a3, a6 and a4 respectively identifies; According to this specific embodiment of the present invention, these district's radiuses can so be selected, promptly in C-band and L-band transmission course, bending loses is within the specialized range, and each district's radius of second embodiment of the invention is subjected to following 20～23 relational expressions restriction:
The about 2.7 μ m (20) of a1=
The about 6.3 μ m (21) of a5=
The about 8.8 μ m (22) of a3=
The about 10.8 μ m (23) of a6=
In fibre-optic second explanation embodiment according to the present invention, refractive index curve is included in shown in accompanying drawing 4a between a plating germanium center core area 1 and the plating germanium ring core district 3 has two plating germanium and plating fluorine annular ring, inner coating district 5 and outside coating district 6; Outside pure glass region 4 can stipulate to be placed on outer the placing in plating germanium and the outside coating of plating fluorine district 6.
According to second embodiment of the present invention, light transmitting fiber has a refractive index curve shown in accompanying drawing 4a, and this fibre-optic each as mentioned above the relative radius of parts have following feature:
Decay≤0.25 at the 1550nm wave band;
In 1530nm wave band to the chromatic dispersion of 1565nm wave band is 1.8ps/nm.km to 6.0ps/nm.km;
In 1565nm wave band to the chromatic dispersion of 1625nm wave band is 4.0ps/nm.km to 11ps/nm.km;
(typical case) chromatic dispersion gradient is 0.07ps/nm
2.km;
Polarization mode dispersion (PMD)≤0.1ps/km0.5;
Mode field diameter (MFD) is 9.6 ± 0.4 μ m;
Cutoff wavelength (optical cable)≤1480nm;
Core concentric rate＜0.6 μ m;
(typical case) useful area is 70 square microns;
Microcosmic bending (pin grid array)＜0.05dB is at 1550nm wave band and 1625nm wave band;
(changeing in single axle of 32mm and 60mm axle with 100) macrobending＜0.5dB is at 1550nm wave band and 1625nm wave band;
Reception test adopts 100kpsi.
According to the present invention's regulation, accompanying drawing 6 has disclosed fibre-optic dispersion characteristic shown in Fig. 2 a and Fig. 4 a.Simultaneously, accompanying drawing 6 shows also how waveguide dispersion controls fibre-optic low chromatic dispersion of announcement and low-dispersion slope; Wherein waveguide dispersion can be determined by following formula (24):
Wherein:
λ represents optical wavelength;
B represents the nominal propagation constant;
C represents light transmission speed;
Accompanying drawing 6 broken line curve representation light transmitting fibers have following waveguide feature:
(n1-n4)=about 0.007;
(n3-n4)=about 0.0016;
(n2-n4)=about-0.0006;
The about 2.7 μ m of a1=, about 8.8 μ m (n1-n4)=about 0.007 of about 6.3 μ m of a2=and a3=;
(n3-n4)=about 0.0016;
(n5-n4)=about-0.0006;
(n6-n4)=about-0.0006;
The about 2.7 μ m of a1=, a5=about 8.8 μ m of about 6.3 μ m a3=and the about 10.8 μ m of a6=: chromatic dispersion of present explanation light transmitting fiber and waveguide dispersion characteristic parameter with above architectural feature keep same numerical value.
Owing to rely on the non-linear increase of light transmitting fiber that lower refractive index causes for power, can determine by following Kerr effect formula (25):
N
1＝N
0+N
LP/A
eff(25)
Wherein:
N
0The expression refractive index;
N
LThe expression nonlinear refractive index;
P represents fibre-optic light intensity.
Above formula shows that large effective area can help to reduce the non-linear negative effect that causes.
Test findings shows, not influencing other light transmitting fiber parameters for example under the situation of chromatic dispersion gradient, chromatic dispersion and bending property, is difficult to obtain big useful area; Yet,, can keep the substantially constant of relevant light transmitting fiber controlled variable by the fibre-optic characteristic parameter design of the present invention.
The present invention disclose and illustrated have large effective area, the light transmitting fiber of low-dispersion slope and low micro-crooked susceptibility; Useful area is a fibre-optic characteristic parameter, and useful area is directly relevant with the mode field diameter; Because fibre-optic mode field can extend to fibre-optic coating, so mode field diameter (MFD) and core diameter tool are very different; Here it is, and mode field diameter (MFD) rather than core diameter are the reasons of an important control parameter.Accompanying drawing 3 and accompanying drawing 5 have disclosed the field strength distribution characteristics, and in the light transmitting fiber diametric(al), the mode field strength values overlaps respectively on accompanying drawing 2a and the accompanying drawing 4a.
By analyzing accompanying drawing, can help to understand and explanation the present invention, and these accompanying drawings do not limit the protection domain of claim of the present invention; Obviously, for the alternative technique personnel of this area, under the situation of listed spirit and scope, the light transmitting fiber of the embodiment of possible detailed description of the invention improves in not breaking away from claimed claims of the present invention.Therefore, the patentee also recognizes and will include this improvement within the rights protection scope in, and the present invention limits by following claim.
Claims (22)
1. chromatic dispersion optimized light-guide light transmitting fiber, has higher bright spot area, comprising a center core area (1), a coating district (2), a ring core district (3) and an outer glass district (4), it is characterized in that, the refractive index of said center core area (1) and ring core district (3) is higher than the refractive index in said outer glass district (4), the refractive index in said coating district (2) is lower than the refractive index in said outer glass district (4), and said refractive index is subjected to the restriction of following formula (1):
n1＞n3＞n4＞n2(1)
And the value of the refractive index of said center core area (1), coating district (2), ring core district (3) and outer glass district (4) is subjected to the restriction of following formula (2)-(4) so that optical fiber C-band promptly 1530～1565nm and L-band promptly have low chromatic dispersion gradient, low chromatic dispersion and higher effective area in the communication process of 1565～1625nm:
0.008＞(n1-n4)＞0.007 (2)
0.0018＞(n3-n4)＞0.0014 (3)
-0.0005＞(n2-n4)＞-0.0007 (4)
Wherein n1, n2, n3 and n4 represent the refractive index of said center core area (1), coating district (2), ring core district (3) and outer glass district (4) respectively.
2. according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 1, it is characterized in that, said coating district (2) is arranged on outer the placing of described center core area (1), described ring core district (3) is arranged on outer the placing in described coating district (2), and described outer glass district (4) is around described ring core district (3).
3. according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 1, it is characterized in that described optical fiber is no more than 0.08ps/nm for little curved loss and chromatic dispersion gradient
2.km insensitive.
4. according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 1, it is characterized in that said refractive index is further limited by following formula:
(n1-n4)=about 0.007 (5)
(n3-n4)=about 0.0016 (6)
(n2-n4)=about-0.0006 (7).
5. according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 1, it is characterized in that the radius of said center core area (1), coating district (2), ring core district (3) is limited by following formula (8)-(10):
The about 2.7 μ m (8) of a1=
The about 6.3 μ m (9) of a2=
The about 8.8 μ m (10) of a3=
Wherein said a1, a2 and a3 represent the radius of center core area (1), coating district (2) and ring core district (3) respectively.
6. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 1-5, it is characterized in that, the coating district (2) that between center core area (1) of plating germanium and said ring core district (3), includes plating germanium and plate fluorine, and said outer glass district (4) is arranged on the periphery in the ring core district (3) of said plating germanium.
7. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 1-5, it is characterized in that, decay≤0.22 at the 1550nm place is 2.2 to 6.0ps/nm.km in the chromatic dispersion of 1530 to 1565nm place's light, is 4.0 to 11ps/nm.km in the chromatic dispersion of 1565 to 1625nm place's light.
8. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 1-5, it is characterized in that typical chromatic dispersion gradient is 0.07ps/nm
2.km, the Polarization Dispersion slope is≤0.1ps/km
0.5, the mode field diameter is 9.6 ± 0.4 μ m.
9. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 1-5, it is characterized in that the cutoff wavelength of optical fiber is≤1280nm, core concentric rate＜0.6 μ m, useful area is 70 square microns.
10. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 1-5, it is characterized in that, 1550 and the little curved of 1625nm place be pin grid array＜0.05dB, 1550 and the 1625nm place, with the 100 macrobending＜0.5dB that change in single axle of 32mm and 60mm axle.
11., it is characterized in that said coating district (2) is divided into two districts-inner coating district (5) and outside coating district (6) according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 1, said ring core district (3) is arranged between the two.
12. according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 11, it is characterized in that, said optical fiber comprises a center core area (1), an inner coating district (5), a ring core district (3), an outside coating district (6) and an outer glass district (4), the refractive index of said center core area (1) and ring core district (3) is higher than the refractive index in said outer glass district (4), the refractive index in said inner coating district (5) and said outside coating district (6) is lower than the refractive index in said outer glass district (4), and said refractive index is subjected to the restriction of following formula (11):
n1＞n3＞n4＞n5＝n6(11)
And the value of the refractive index in said district is subjected to the restriction of following formula (12)-(15), so that optical fiber has low chromatic dispersion gradient, low chromatic dispersion and higher effective area in the communication process of C and L-band:
0.008＞(n1-n4)＞0.007 (12)
0.0018＞(n3-n4)＞0.0014 (13)
-0.0005＞(n5-n4)＞-0.0007?(14)
-0.0005＞(n6-n4)＞-0.0007?(15)
Wherein n1, n5, n3, n6 and n4 represent the refractive index of said center core area (1), inner coating district (2), ring core district (3), outside coating district (6) and outer glass district (4) respectively.
13., it is characterized in that the refractive index in said inner coating district (5) and said outside coating district (6) equates according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 11.
14. according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 11, it is characterized in that, said inner coating district (5) is arranged on the periphery of described center core area (1), described ring core district (3) is arranged between described inner coating district (5) and the outside coating district (6), described outside coating district (6) is arranged on the periphery in described ring core district (3), and described outer glass district (4) is around described outside coating district (6).
15., it is characterized in that described optical fiber is no more than 0.08ps/nm for little curved loss and chromatic dispersion gradient according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 11
2.km situation is insensitive.
16., it is characterized in that said refractive index is further limited by following formula (16)-(19) according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 11:
(n1-n4)=about 0.007 (16)
(n3-n4)=about 0.0016 (17)
(n5-n4)=about-0.0006 (18)
(n6-n4)=about-0.0006 (19).
17., it is characterized in that the radius in said district is limited by following formula (20)-(23) according to the described chromatic dispersion optimized light-guide light transmitting fiber of claim 11:
The about 2.7 μ m (20) of a1=
The about 6.3 μ m (21) of a5=
The about 8.8 μ m (22) of a3=
The about 10.8 μ m (23) of a6=
Wherein said a1, a5, a3 and a6 represent the radius in center core area (1), inner coating district (5), ring core district (3) and outside coating district (6) respectively.
18. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 11-17, it is characterized in that, the coating district, inside (5) and the outside coating district (6) that between plating center core area (1) of germanium and said ring core district (3), include plating germanium and plate fluorine, and said outer glass district (4) is arranged on said plating germanium and plates the periphery in the outside coating district (6) of fluorine.
19. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 11-17, it is characterized in that, decay≤0.25 at the 1550nm place, at 1530 to 1565nm places, the chromatic dispersion of light is 1.8 to 6.0ps/nm.km, is 4.0 to 11ps/nm.km in the chromatic dispersion of 1565 to 1625nm place's light.
20., it is characterized in that typical chromatic dispersion gradient is 0.07ps/nm according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 11-17
2.km, the Polarization Dispersion slope is≤0.1ps/km
0.5, mode field diameter MFD is 9.6 ± 0.4 μ m.
21., it is characterized in that cable cut-off wavelength≤1480nm, core concentric rate＜0.6 μ m according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 11-17; Typical case's useful area is 70 square microns.
22. according to the described chromatic dispersion optimized light-guide light transmitting fiber of any claim among the claim 11-17, it is characterized in that, 1550 and the microcosmic bending at 1625nm place be pin grid array＜0.05dB, 1550 and the 1625nm place, with the 100 macrobending＜0.5dB that change in single axle of 32mm and 60mm axle.
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| CN101825741A (en) * | 2010-03-29 | 2010-09-08 | 哈尔滨工程大学 | Coaxial dual-waveguide structured optical fiber with annular waveguide layer and preparation method thereof |
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| CN101764343B (en) * | 2010-01-08 | 2012-04-25 | 北京交通大学 | Optical fiber of coupling multilayer rare earth blending ring-shaped fiber core with single-mold fiber core |
| CN110749953B (en) * | 2019-10-29 | 2023-07-14 | 长飞光纤光缆股份有限公司 | Low-dispersion single-mode optical fiber |
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| CN101825741A (en) * | 2010-03-29 | 2010-09-08 | 哈尔滨工程大学 | Coaxial dual-waveguide structured optical fiber with annular waveguide layer and preparation method thereof |
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