WO2006025231A1 - シングルモード光ファイバ - Google Patents
シングルモード光ファイバ Download PDFInfo
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- WO2006025231A1 WO2006025231A1 PCT/JP2005/015293 JP2005015293W WO2006025231A1 WO 2006025231 A1 WO2006025231 A1 WO 2006025231A1 JP 2005015293 W JP2005015293 W JP 2005015293W WO 2006025231 A1 WO2006025231 A1 WO 2006025231A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02266—Positive dispersion fibres at 1550 nm
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/03644—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - + -
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03661—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 4 layers only
- G02B6/03672—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 4 layers only arranged - - + -
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03688—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 5 or more layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02223—Dual window fibres, i.e. characterised by dispersion properties around 1550 nm and in at least another wavelength window, e.g. 1310 nm
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02228—Dispersion flattened fibres, i.e. having a low dispersion variation over an extended wavelength range
- G02B6/02238—Low dispersion slope fibres
- G02B6/02242—Low dispersion slope fibres having a dispersion slope <0.06 ps/km/nm2
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03605—Highest refractive index not on central axis
- G02B6/03611—Highest index adjacent to central axis region, e.g. annular core, coaxial ring, centreline depression affecting waveguiding
Definitions
- the present invention has a wavelength dispersion characteristic equivalent to that of a conventional single mode optical fiber (hereinafter referred to as SMF), and has a very small bending loss when bent to a small diameter, and has a characteristic. About.
- SMF single mode optical fiber
- WDM Widelength Division Multiplexing
- Optical fibers for WDM transmission have been required to have characteristics such as suppression of nonlinear effects and dispersion control.
- a fiber with a reduced dispersion slope and a fiber with almost no increase in loss due to OH have been proposed for a system with a span of several hundred km called a metro.
- Patent Document 1 US Patent Application Publication No. 2004Z0213531
- Patent Document 2 Pamphlet of International Publication No. 01Z27667
- Patent Document 3 Japanese Patent Application Laid-Open No. 2004-133373
- Patent Document 4 Japanese Patent No. 2618400
- Non-Patent Document 1 Ikeda et al., "Low-loss optical fiber with reduced connection loss", IEICE Technical Report, 103, 255, OCS2003 -43 (2003)
- Non-Patent Document 2 Sato et al., “Small-Bend Optical Fiber for Optical Access”, Proceedings of the 2003 IEICE Communication Society Conference, B-10-30 (2003)
- Non-patent literature 3 S. Matsuo, et al., Bend- insensitive and Low-splice-loss optical fiber for indoor wiring in FTTH ", Technical Digest of OFC2004, ThI3 (2004)
- Non-Patent Document 4 Ikeda et al., "Low-loss optical fiber with reduced splice loss", IEICE Proceedings of 2004 General Conference, B-10-10 1
- JP 5 1. Sakabe, et al., Enhanced Bending Loss Insensitive Fiber and New Cables for CWDM Access Network, "Proceedings of the 53rd IWCS, pp.112—118 (2 004)
- optical fibers are generally not allowed to have a bending radius of about 30 mm, and careful attention was required to avoid excessive bending during routing.
- Fig. 1 is a graph illustrating the bending radius dependence of bending loss in an optical fiber with an allowable bending radius of 15 mm. As shown in Fig.
- the low bending loss optical fiber disclosed in Patent Document 1 shows an example of ⁇ 4.6 to 10.7 ps / nmZkm in the wavelength 1300 nm band.
- the chromatic dispersion in the 1300nm band of G.652 is calculated from the zero-dispersion wavelength and slope specification of G.652 and is in the range of 0 force -2.2ps / nm / km, whereas this conventional low
- the chromatic dispersion of the bending loss optical fiber has a large absolute value.
- this level of chromatic dispersion was almost a problem at transmission distances on the order of several tens of meters, such as in-home wiring.
- the optical fiber for the line is resistant to bending loss when handling in a cable or a closure box is taken into consideration.
- the chromatic dispersion value of such a low bending loss optical fiber may be a problem in a PON system.
- the wavelength 1500 nm band is used for transmission from the base station to the user
- the wavelength 130 Onm band is used for transmission from the user to the base station. It is prescribed by etc.
- Inexpensive Fabry-perot lasers (hereinafter referred to as FP lasers) are widely used as light sources for the 1300 nm wavelength band.
- the FP laser emits multimode light, its transmission characteristics are greatly affected by the chromatic dispersion of the optical fiber that forms the transmission line. Since current transmission equipment is designed with the wavelength dispersion characteristics of G. 652 in place, the wavelength dispersion value with a large absolute value of conventional low bending loss optical fiber may cause communication failure. It may not be preferable.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an SMF that has very low bending loss while complying with the chromatic dispersion characteristics defined in G.652.
- the present invention provides a cutoff wavelength of 1260 nm or less, a zero dispersion wavelength strength in the range of 300 nm to 1324 nm, a zero dispersion slope of 0.093 psZnm 2 Zkm or less, It provides an SMF that has an MFD in the range of 5.5 m to 7.9 m at a wavelength of 1310 nm and a bending loss of 0.5 dB or less at a wavelength of 1550 nm when it is wound 10 times around a radius of 10 mm.
- the cutoff wavelength is a deviation of a cable cutoff wavelength, a fiber cutoff wavelength, or a jumper cutoff wavelength.
- the chromatic dispersion value at a wavelength of 1550 nm is preferably +18 psZnmZkm or less, more preferably +17 psZnmZkm or less.
- the RDS defined by the dispersion slope Z wavelength dispersion value has a wavelength of 15
- It is preferably in the range of 0. 003nm- 1 ⁇ 0. 004nm _1 at 50nm.
- the bending loss generated when the wire is wound 10 times with a radius of 10 mm has a wavelength of 1
- 550nm! / Preferably less than 0.1 ldB! /.
- the bending loss generated when the radius of 7.5 mm is wound 10 times is the wavelength.
- a central core having a radius r and a refractive index n
- an inner cladding having a radius r and a refractive index n provided on the outer periphery of the central core, and an outer periphery of the inner cladding.
- the radius r of the trench portion is in the range of 6 ⁇ m to 20 ⁇ m.
- a central core having a radius r and a refractive index n, an inner cladding having a radius r and a refractive index n provided on the outer periphery of the central core, and an outer periphery of the inner cladding are provided.
- Preferred to have a distribution.
- the radius r of the inner cladding is 4.5 m to
- a range of 16 ⁇ m is preferred.
- the outer cladding radius r is 28 ⁇ m to 6 ⁇ m.
- the SMF of the present invention has an MFD of 5.5 / ⁇ at a cutoff wavelength of 1260 nm or less, a zero dispersion wavelength in the range of 1300 nm to 13 24 nm, a zero dispersion slope of 0.093 psZnm 2 Zkm or less, and a wavelength of 1310 nm. ⁇ to 7.9 m, and because the bending loss that occurs when winding 10 times on a radius of 10 mm is 0.5 dB or less at a wavelength of 1550 nm, it conforms to the chromatic dispersion characteristics specified in G. 652 While bending loss is very small SM F can be realized.
- FIG. 1 is a graph illustrating the bending radius dependence of bending loss in a conventional SMF.
- FIG. 2 is a graph illustrating the ⁇ dependence of bending loss.
- FIG. 3 is a graph showing the refractive index distribution of the low bending loss SMF produced in Example 1.
- FIG. 4 is a graph showing the refractive index distribution of the low bending loss SMF produced in Example 2.
- FIG. 5 is a graph showing the refractive index distribution of the low bending loss SMF produced in Example 3.
- FIG. 6 is a graph showing the refractive index distribution of the low bending loss SMF produced in Example 4.
- FIG. 7 is a graph showing the refractive index distribution of the low bending loss SMF produced in Example 5.
- FIG. 8 is a graph showing the refractive index distribution of the low bending loss SMF produced in Example 6.
- the low bending loss SMF of the present invention has an MFD at a cutoff wavelength of 1260 nm or less, a zero dispersion wavelength in the range of 1300 nm to 1324 nm, a zero dispersion slope of 0.093 ps / nm 2 / km or less, and a wavelength of 131 Onm. 5.5 Bending loss in the range of ⁇ to 7. and 10 times at a radius of 10 mm is 0.5 dB or less at a wavelength of 1550 nm.
- the cut-off wavelength of the low bending loss SMF of the present invention is defined by a cable cut-off wavelength, a fiber cut-off wavelength, or a jumper cut-off wavelength depending on the state of use of the fiber.
- the measurement method for each cutoff wavelength is specified in ITU-T G. 650. 1, "Definitions and test metnods for linear, deterministic attributes of single-mode fiber ana cable"! / .
- the low bending loss SMF of the present invention preferably has a chromatic dispersion value of +18 ps ZnmZkm or less at a wavelength of 1550 nm.
- a chromatic dispersion value of +18 ps ZnmZkm or less at a wavelength of 1550 nm.
- 17psZnmZkm is described as a typical value of the wavelength dispersion value at a wavelength of 1550 nm, and when the value is extremely larger than this, the viewpoint power of line design is preferable.
- the low bending loss SMF of the present invention is RDS (Relative Disp ersion Slope) is preferably in the range of 0.003 nm to 0.004 nm.
- This RDS is a parameter obtained by (dispersion slope) Z (wavelength dispersion value), and is an index for determining the compatibility between the dispersion compensating fiber and the compensated fiber.
- Current G. 652 to a defined light Fainoku RDS hereinafter referred to as G. 652 fiber.
- G. 652 fiber Is about 0. 0032nm _1.
- a dispersion compensating fiber is indispensable.
- the dispersion compensation fiber for G.652 fiber can be used and it is economical.
- RDS is if the range of 0. 0 03nm- 1 ⁇ 0. 004nm _1 , it is possible to use a dispersion compensating optical fiber for G. 652 fiber.
- the low bending loss SMF includes a central core having a radius r and a refractive index n, an inner cladding having a radius r and a refractive index n provided on the outer periphery of the central core,
- Each radius r, r, r of the outer cladding is the central force of the central core to the outer peripheral edge of each part
- 3 to 5 are diagrams illustrating the refractive index distribution of the low bending loss SMF10, 20, 30 having a trench portion, in which the reference numeral 1 is a central core, 2 is an inner cladding, and 3 is a trench. Sections 4 and 5 indicate the outer cladding.
- Patent Document 4 Such a refractive index distribution is disclosed in Patent Document 4.
- the invention described in Patent Document 4 discloses the effect of this refractive index distribution in the design of a so-called dispersion-shifted optical fiber having a zero dispersion wavelength near 1550 nm.
- Each of the relative refractive index differences ⁇ of the trench portion has the following relationship:
- Each of the radius r and the trench radius r has the following relationship:
- the relative refractive index difference ⁇ force SO. Of the central core is smaller than 40%, the MFD at a wavelength of 1310 nm is larger than 7. As a result, the bending loss that occurs when winding 10 times at a radius of 10 mm is reduced at a wavelength of 1550 nm. Since it exceeds 0.1 dB, the characteristic of low bending loss, which is the object of the present invention, cannot be satisfied.
- the relative refractive index difference ⁇ of the central core exceeds 0.85%, the zero-dispersion wavelength is reduced to 1300 ⁇ ! It becomes impossible to fit in the range of ⁇ 1324nm.
- ⁇ is — 0.20%
- the relative refractive index difference ⁇ of the trench is the power to reduce bending loss — 1.0% or more and less than ⁇
- the bending loss changes so as to have a minimum value with respect to ⁇ .
- ⁇ should be in the range of 0.2% to 0.6%
- r Zr is selected from the range of 1.5 to 3.0 according to ⁇ and the like. ⁇ force, otherwise
- a large r Zr is selected in the above range, and if ⁇ is large, a small r in the above range
- the reduction viewpoint power cannot achieve a sufficient effect. If it exceeds 3.0, it may be difficult to enable single mode transmission.
- the radius r of the trench portion is 5.0 m to 20 m depending on the combination of the parameters described above.
- the radius r of the outer cladding can be set regardless of the parameters described above.
- the radius r of the outer cladding of a typical optical fiber is 62.5 m (diameter 125 m) as the center value.
- the center value is suitably set in the range of 30 ⁇ m to 62.5 ⁇ m.
- r should be in the range of 28 ⁇ m to 64 ⁇ m! /.
- Tables 1 to 3 show design examples of the low bending loss SMF of the present invention having a trench portion under various conditions (see Example 1 to Example 22.) 0 In these Examples 1 to 22, the cable The cut-off wavelength was 1220 nm in all cases.
- Example 1 2 3 4 5 6 7 8 9-1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.8-2.5 2.5 2.5 2.5 3.0 2.2 2.0 2.5 2.8
- Example 10 11 12 13 14 15 16 17 18-1.8 1.8 2.0 2.0 2.2 2.2 2.4 2.4 2.2-2.8 2.8 3.0 3.0 3.0 3.0 3.2 3.9 3.7
- the low bending loss SMF of Examples 1 to 18 according to the present invention has a chromatic dispersion value of +18 psZnmZkm or less at a wavelength of 1550 nm, and 10 times a radius of 1 Omm! ⁇ ⁇
- the bending loss generated at the time of 1550 nm is less than 0.1 dB, and SMF with very low bending loss can be realized while complying with the chromatic dispersion characteristics specified in G.652.
- the low bending loss SMF of the present invention is the same material as the conventionally known SMF (for example, quartz-based) except that the refractive index distribution and radius of each layer are appropriately set so as to satisfy the above-mentioned parameters. Glass) and similar manufacturing methods (for example, MCVD method, external method, etc.).
- the low bending loss SMF of the present invention does not conform to the chromatic dispersion characteristics specified in G.652. However, since the bending loss is very small, it can be suitably used as an SMF for home wiring in the FTTH system.
- the low bending loss SMF includes a central core having a radius!:, Refractive index n, and an inner cladding having a radius r and refractive index n provided on the outer periphery of the central core.
- the outer cladding with a radius r and a refractive index n provided on the outer periphery of the inner cladding.
- It is the distance at. 6 to 8 are diagrams illustrating the refractive index distribution of the low bending loss SM F40, 50, 60 having the W-type refractive index distribution of the present invention, in which the reference numeral 1 is the central core, 2 is The inner cladding, 4 and 5, indicate the outer cladding.
- the relative refractive index difference of the central core with respect to the outer cladding is ⁇
- the relative refractive index difference of the inner cladding is ⁇
- the relative refractive index difference ⁇ of the central core is smaller than 0.42%, the MFD at a wavelength of 1310 nm is larger than 7. Accordingly, the bending loss that occurs when winding 10 times at a radius of 10 mm is reduced to the wavelength. Since it exceeds 0.5 dB at 1550 nm, the object of realizing the low bending loss of the present invention cannot be achieved.
- the relative refractive index difference ⁇ exceeds 0.85%, the MFD at a wavelength of 1310 nm is less than 5. In this case, the connectivity may be deteriorated, which is not preferable.
- 2 1 2 2 1 is preferably in the range of 1 ⁇ 5 to 5 ⁇ 0, and ⁇ is preferably in the range of ⁇ 1.0% to 1.0%.
- y (r Zr) ⁇
- the zero dispersion wavelength can be set within the range of 1300 nm to 1324 nm. Furthermore, even when y is smaller than 0.075%, the two conditions cannot be satisfied.
- the inner cladding radius r is preferably in the range of 4.5 / ⁇ ⁇ to 16 m.
- the radius r of the outer cladding can be set regardless of the parameters described above.
- the radius r of the outer cladding of a typical optical fiber is 62.5 m (diameter 125 m) as the center value.
- the center value is suitably set in the range of 30 ⁇ m to 62.5 ⁇ m.
- r should be in the range of 28 ⁇ m to 64 ⁇ m! /.
- Tables 4 to 6 show design examples of the low bending loss SMF of the present invention having a W-type refractive index distribution under various conditions (see Examples 23 to 44;).
- the cable cutoff wavelength was set to 1220 nm.
- the low bending loss SMF of Examples 23 to 44 according to the present invention has a chromatic dispersion value of not more than +18 psZnmZkm at a wavelength of 155 Onm, and 10 times on a radius of 10 mm.
- the resulting bending loss is 0.5 dB or less at a wavelength of 1550 nm, and an SMF with very low bending loss can be realized while complying with the chromatic dispersion characteristics specified in G.652.
- the low bending loss SMF according to the present invention is calculated based on Example 14 shown in Table 2.
- Figure 3 shows the refractive index profile of the low bending loss SMFIO produced in this example.
- This low bending loss SMF10 is obtained by synthesizing the central core 1, inner clad 2, trench 3 and some outer clads 4 that also have silica-based glass power by the MCVD method, and then externally attaching the remaining outer clad 5
- the resulting optical fiber preform was manufactured by drawing in the same way as ordinary SMF. Each characteristic of the obtained low bending loss SMF10 was measured. The results are shown in Table 7.
- the low bending loss SMFIO of this example had a MFD at a wavelength of 1310 nm that was smaller than the range of 7.40 111 and 0.652.
- the zero-dispersion wavelength was 1316.5 nm, which satisfied the provisions of G. did.
- the chromatic dispersion value at a wavelength of 1550 nm was 16.5 psZnmZkm, and a value according to the typical value of G.652 was obtained.
- the bending loss that occurs when winding 10 times on a radius of 10 mm is always 0.03 dB / J at a wavelength of 1550 nm, and an SMF with very low bending loss can be obtained while maintaining the chromatic dispersion characteristics of G.652. It was. [0060] (Example 2)
- the low bending loss SMF according to the present invention was manufactured based on Example 6 shown in Table 1.
- Figure 4 shows the refractive index profile of the low bending loss SMF20 produced in this example.
- This low bending loss SMF20 is synthesized by synthesizing the center core 1, inner clad 2, trench 3 and some outer clads 4 that also have silica-based glass power by MCVD, and then externally synthesize the remaining outer clad 5.
- the resulting optical fiber preform was then drawn in the same way as ordinary SMF.
- Each characteristic of the obtained low bending loss SMF20 was measured. The results are shown in Table 8.
- the low bending loss SMF20 of this example had an MFD of 6.19 / zm at a wavelength of 1310 nm, which was a smaller MFD than the SMF of Example 1.
- the zero-dispersion wavelength was 1306.2 nm, which satisfied the G.652 regulations.
- the chromatic dispersion value at a wavelength of 1550 nm was 16.6 psZnmZkm, and a value according to the typical value of G. 652 was obtained.
- the bending loss was not only 10 mm radius, but also a very small value of less than 0.1 dB at a wavelength of 1550 nm even when it was applied 10 times to a radius of 7.5 mm and a radius of 5. Omm.
- the low bending loss SMF according to the present invention was manufactured based on Example 6 shown in Table 1.
- Figure 5 shows the refractive index profile of the low bending loss SMF30 produced in this example.
- This low bending loss SMF30 is composed of the central core 1, the inner cladding 2, the trench 3, and a part of the outer cladding 4, which also has silica-based glass power.
- the resulting optical fiber preform was then drawn in the same way as ordinary SMF.
- Each characteristic of the obtained low bending loss SMF30 was measured. The results are shown in Table 9.
- the low bending loss SMF30 of this example had an MFD at a wavelength of 1310 nm of 7.67 ⁇ m, which was larger than the SMF of Example 1.
- the zero-dispersion wavelength is 1309.3nm, which satisfies the G.652 regulations.
- the chromatic dispersion value at a wavelength of 1550 nm was 17.3 psZnmZkm, and a value according to the typical value of G.652 was obtained.
- the bending loss that occurs when winding 10 times on a radius of 10 mm is always 0.03 dB / J at a wavelength of 1550 nm, and an SMF with very low bending loss can be obtained while maintaining the chromatic dispersion characteristics of G.652. It was.
- a low bending loss SMF according to the present invention was manufactured based on Example 24 shown in Table 4.
- Figure 6 shows the refractive index profile of the low bending loss SMF40 manufactured in this example.
- This low bending loss SMF40 is made by synthesizing the central core 1 and inner clad 2 made of silica glass by the VAD method and the outer clad 5 by the external method, and the resulting optical fiber preform is combined with ordinary SMF. It was produced by drawing in the same manner. Each characteristic of the obtained low bending loss SMF40 was measured. The results are shown in Table 10. [0067] [Table 10] Item Measurement result
- the low bending loss SMF40 of this example has a MFD at a wavelength of 1310 nm of 7.90 ⁇ m / G.652 / J, a force zero dispersion wavelength of 1313.8 nm, and a G.652 Satisfies the regulations.
- the chromatic dispersion value at a wavelength of 1550 nm was 16.4 psZnmZkm, and a value according to the typical value of G.652 was obtained.
- the bending loss that occurs when winding 10 times on a radius of 10 mm is always 0.14 dB / J at a wavelength of 1550 nm, and an SMF with very small bending loss can be obtained while maintaining the chromatic dispersion characteristics of G.652. It was.
- FIG. 7 shows the refractive index distribution of the low bending loss SMF50 produced in this example.
- This low bending loss SMF50 is obtained by synthesizing the central core 1, the inner cladding 2, and a part of the outer cladding 4, which also have silica-based glass power, by the MCVD method, and then externally attaching them to synthesize the remaining outer cladding 5.
- the resulting optical fiber preform is drawn in the same way as normal SMF. Manufactured.
- Each characteristic of the obtained low bending loss SMF50 was measured. The results are shown in Table 11.
- the low bending loss SMF50 of the present example has a MFD at a wavelength of 1310 nm of 7.28 ⁇ m, which is a value smaller than the range of G. 652.
- the zero-dispersion wavelength is 1302.3 nm, and G. 652 Satisfies the regulations.
- the chromatic dispersion value at a wavelength of 1550 nm was 16.6 psZnmZkm, and a value according to the typical value of G.652 was obtained.
- the bending loss caused by winding 10 times at a radius of 7.5 mm is very small at 0.15 dB at a wavelength of 1550 nm. SMF with a very small bending loss while maintaining the chromatic dispersion characteristics of G.652. was gotten.
- a low bending loss SMF according to the present invention was manufactured based on Example 35 shown in Table 5.
- Fig. 8 shows the refractive index profile of the low bending loss SMF60 manufactured in this example.
- This low bending loss SMF60 is composed of the central core 1, the inner cladding 2, After the outer cladding 4 is synthesized by the MCVD method, external attachment is performed, the remaining outer cladding 5 is synthesized, and the resulting optical fiber preform is drawn in the same manner as ordinary SMF. did.
- Each characteristic of the obtained low bending loss SMF60 was measured. The results are shown in Table 12.
- the low bending loss SMF60 of this example has a MFD at a wavelength of 1310nm of 6.27 ⁇ m, which is a value smaller than the range of G.652.
- the zero-dispersion wavelength is 1310.8 nm, Satisfies the regulations.
- the chromatic dispersion value at a wavelength of 1550 nm was 15.6 psZnmZkm, and a value according to the typical value of G.652 was obtained.
- the bending loss that occurs when winding 10 times on a radius of 5mm is always 0.09dB / J at a wavelength of 1550nm, and an SMF with very low bending loss was obtained while maintaining the chromatic dispersion characteristics of G.652. .
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Abstract
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800280660A CN101006372B (zh) | 2004-08-30 | 2005-08-23 | 单模光纤 |
KR1020077005444A KR100890976B1 (ko) | 2004-08-30 | 2005-08-23 | 싱글 모드 광파이버 |
EP05775131.5A EP1788411B1 (en) | 2004-08-30 | 2005-08-23 | Single-mode optical fiber |
JP2006531923A JP4833071B2 (ja) | 2004-08-30 | 2005-08-23 | シングルモード光ファイバ |
DK05775131.5T DK1788411T3 (en) | 2004-08-30 | 2005-08-23 | Single-mode optical fiber |
US11/679,001 US7440663B2 (en) | 2004-08-30 | 2007-02-26 | Single-mode optical fiber |
Applications Claiming Priority (4)
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JP2004-250039 | 2004-08-30 | ||
JP2004250039 | 2004-08-30 | ||
JP2004296369 | 2004-10-08 | ||
JP2004-296369 | 2004-10-08 |
Related Child Applications (1)
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US11/679,001 Continuation US7440663B2 (en) | 2004-08-30 | 2007-02-26 | Single-mode optical fiber |
Publications (1)
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WO2006025231A1 true WO2006025231A1 (ja) | 2006-03-09 |
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PCT/JP2005/015293 WO2006025231A1 (ja) | 2004-08-30 | 2005-08-23 | シングルモード光ファイバ |
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US (1) | US7440663B2 (ja) |
EP (2) | EP1788411B1 (ja) |
JP (1) | JP4833071B2 (ja) |
KR (1) | KR100890976B1 (ja) |
CN (1) | CN101006372B (ja) |
DK (2) | DK2348344T3 (ja) |
WO (1) | WO2006025231A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP1788411A4 (en) | 2010-10-27 |
EP1788411A1 (en) | 2007-05-23 |
EP2348344A1 (en) | 2011-07-27 |
KR20070041618A (ko) | 2007-04-18 |
DK2348344T3 (da) | 2013-04-15 |
US20070147756A1 (en) | 2007-06-28 |
US7440663B2 (en) | 2008-10-21 |
EP2348344B1 (en) | 2013-02-20 |
JP4833071B2 (ja) | 2011-12-07 |
KR100890976B1 (ko) | 2009-03-27 |
CN101006372A (zh) | 2007-07-25 |
CN101006372B (zh) | 2010-09-08 |
DK1788411T3 (en) | 2014-03-17 |
EP1788411B1 (en) | 2014-01-01 |
JPWO2006025231A1 (ja) | 2008-05-08 |
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