WO2003079075A1 - Fibre optique conservant la polarisation - Google Patents
Fibre optique conservant la polarisation Download PDFInfo
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- WO2003079075A1 WO2003079075A1 PCT/JP2003/003002 JP0303002W WO03079075A1 WO 2003079075 A1 WO2003079075 A1 WO 2003079075A1 JP 0303002 W JP0303002 W JP 0303002W WO 03079075 A1 WO03079075 A1 WO 03079075A1
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- optical fiber
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- maintaining optical
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- stress applying
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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
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
Definitions
- the present invention relates to a polarization-maintaining optical fiber having a clad diameter reduced to about 80 ⁇ m, and particularly to a connection loss with a normal polarization-maintaining optical fiber having a clad diameter of about 125 ⁇ . It relates to a reduced optical fiber.
- polarization-maintaining optical fibers are used as optical fibers for connecting polarization-dependent optical components, or are processed as transmission optical components such as optical fiber gratings and optical fiber power brass. It is used in various optical transmission devices, such as optical fiber gyroscopes, and measuring instruments.
- Examples of this type of polarization maintaining optical fiber include, for example, U.S. Pat. No. 4,478,849, and, as disclosed in Japanese Patent No. 2,750,345,
- the core having birefringence by forming stress applying portions in the clad on both sides of the core is widely used.
- a polarization maintaining optical fiber with this structure is called a PANDA type polarization maintaining optical fiber (Polarization-maintaining AND Absorption-reducing optical fiber). It has the excellent feature of being able to.
- Polarization-maintaining optical fibers generally have a cladding diameter of 125 ⁇ m in consideration of manufacturability, quality stability, and connectivity with ordinary transmission optical fibers.
- a proof test is generally performed by applying a predetermined tension to the polarization-maintaining optical fiber, and the proof test does not break the fiber. I try to use things.
- optical components for optical transmission and various measuring instruments often have a heating element inside, and improvement in cooling efficiency through miniaturization is also desired.
- a conventional polarization-maintaining optical fiber with a cladding diameter of 125 ⁇ m bending at a bending radius smaller than 20 to 30 mm increases the bend loss at the microphone opening, increases the probability of breakage, and improves the characteristics and reliability. Is a problem. For this reason, when connection between optical components and the like is made by optical fibers, a space corresponding to the bending radius of the optical fibers is required, which is a hindrance to downsizing the optical components.
- a polarization-maintaining optical fiber that can be bent with a bending radius smaller than a radius of 2 O mm is described in, for example, “Polarization-maintaining optical fiber” in Fujikura Technical Report No. 85 (issued October 19, 1993).
- a polarization maintaining optical fiber for a gyroscope having a reduced cladding diameter of 80 ⁇ m is known.
- This polarization maintaining optical fiber for a gyroscope has a normal polarization maintaining difference ⁇ (hereinafter simply referred to as a relative refractive index difference) between the core and the cladding to suppress the bend loss at the microphone opening. It is larger than the optical fiber (for example, 0.8 to 1.2%), and has a smaller mode field diameter (for example, 3 to 5 at a wavelength of 0.85 m; 5.5 at a wavelength of 1.55 ⁇ ). 77.5 ⁇ m).
- ⁇ normal polarization maintaining difference
- connection loss due to misalignment tends to increase when performing fusion splicing.
- connection loss becomes extremely large due to the mismatch of the mode field diameter.
- the gyroscope polarization maintaining optical fiber does not need to be connected to another optical fiber, the above-described structural parameters can be adopted. As a result, connection loss is a major problem. For this reason, the structural parameters used for the gyroscope polarization-maintaining optical fiber cannot be adopted for a polarization-maintaining optical fiber for connection or the like. Disclosure of the invention
- the present invention has been made in view of the above circumstances, and has excellent polarization maintaining characteristics even when the clad diameter is reduced to about 80 ⁇ , and has a clad diameter of 125 / m.
- An object of the present invention is to provide a polarization-maintaining optical fiber in which connection loss at the time of connection with a wave-maintaining optical fiber is extremely small.
- the present inventor reduced both the crosstalk and the connection loss by optimizing the structural parameters such as the relative refractive index difference of the polarization maintaining optical fiber and the diameter and spacing of the stress applying section. They have found that it is possible to achieve both connectivity and polarization characteristics, and have completed the present invention.
- the problem is a polarization maintaining optical fiber comprising: a core; a pair of stress applying portions provided radially outward of the core; and a clad surrounding the core and the stress applying portion.
- the cladding diameter is 70 to 90 m
- the diameter of the stress applying part is 21 to 32 m
- the distance between the stress applying parts is 6 to 17 ⁇ m
- the relative refractive index between the core and the cladding is solved by a polarization maintaining optical fiber having a difference of 0.3 to 0.5%.
- the diameter of the stress applying section is 22 to 28 ⁇ , and the distance between the stress applying sections is 8.5 to 1 and 1 mu m, and the mode birefringence 3 X 1 0 one 4 or more, the mode field diameter that put the wavelength 0. 98 / zm 5. 3 ⁇ 6. it is preferable that the 5 m.
- the stress applying part diameter is 22-28 ⁇
- the distance between the stress applying parts is 9-13 m
- the mode birefringence and rate of 3 X 1 0 one 4 or more from 7.1 to 9 a mode field diameter at a wavelength of 1. 30 ⁇ m. it is preferable to 0 mu m.
- the diameter of the stress applying section is 22 to 28 m, and the interval between the stress applying sections is 13 to 16 ⁇ .
- the above-described polarization maintaining optical fiber is suitable as a polarization maintaining optical fiber used for an optical fiber amplifier, a semiconductor laser, and a modulator. Lasers and modulators can be manufactured.
- FIG. 1 is a schematic sectional view showing an example of the polarization maintaining optical fiber of the present invention.
- Figure 2 shows the diameter D of the stress applying part 2 and the stress when the mode birefringence B is constant.
- 9 is a graph showing an example of a relationship with an interval R between the application units 2.
- Figure 3 shows 7 is a graph showing an example of a relationship between a mode field radius and a connection loss caused by a 1 / m axis shift at the time of FIG.
- FIG. 4 is a graph showing an example of a connection loss when an optical fiber having a different MFD is connected with an axis deviation of 1 ⁇ m in the polarization maintaining optical fiber for the 0.98 ⁇ band.
- Fig. 5 is a graph showing an example of the connection loss when the optical fibers with different MFDs are connected with an axis deviation of 1 tim in the polarization maintaining optical fiber for the 1.40 to 1.63 m band. .
- Fig. 6 is a graph showing an example of the connection loss when the optical fibers with different MFDs are connected with a 1 m axis shift in the 1.30 ⁇ band polarization maintaining optical fiber.
- FIG. 7 is a diagram for explaining a method of evaluating the deterioration of the polarization maintaining characteristic due to the application of the adhesive.
- FIG. 8 is a schematic diagram illustrating an example of the configuration of a polarization-maintaining optical fiber amplifier. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic sectional view showing an example of the polarization maintaining optical fiber of the present invention.
- the structure of the polarization maintaining optical fiber of the present invention is similar to that of the conventional PANDA type polarization maintaining optical fiber.
- the core 1 and the stress applying parts 2 and 2 are surrounded by a clad 3.
- a material having a higher refractive index than the clad 3 is used for the core 1, and a material having a larger coefficient of thermal expansion than the core 1 and the clad 3 is used for the stress applying section 2.
- any materials can be used as long as they are used in the conventional PANDA type polarization maintaining optical fiber.
- quartz to which germanium is added (doped) as the core 1 is used. used as the stress-applying parts 2, boron B 2_Rei 1 in 3 of the sectional weight concentration conversion 7-2 1 wt% of doped B 2 0 3 - S I_ ⁇ 2 Gala A configuration using pure quartz as the clad 3 is exemplified.
- the cladding diameter of the polarization maintaining optical fiber of the present invention is 70 to 90 m, more preferably 77 to 83 ⁇ m.
- the diameter D of each stress applying section 2 is 21 to 32 ⁇ , the distance R between the stress applying sections 2 and 2 is 6 to 17 m, and the relative refractive index difference ⁇ is 0.3 to 0. It is 5%.
- the cladding diameter is reduced, so that the bending radius of the optical fiber can be reduced to about 13 mm, and polarization crosstalk is suppressed to a small level, and excellent polarization retention is achieved.
- the connection loss when connecting to a general optical fiber for communication (cladder diameter: 125 ⁇ ⁇ ) is also reduced.
- the diameter of each stress applying section 2 should be 22 to 28 ⁇ , and the distance between the stress applying sections 2 and 2 should be the spacing and 8.. 5 to ll ⁇ m, and the mode birefringence 3 X 1 0 one 4 or more, the mode field diameter at a wavelength of 0. 9 8 mu m and 5. 3 ⁇ 6. 5 ⁇ ⁇ that Is preferred.
- the diameter of each stress applying section 2 is 22 to 28 ⁇ , and the interval between the stress applying sections 2 and 9 is 9 to 13 ⁇ .
- the mode birefringence and 3 X 1 0- 4 or more, the mode field diameter at a wavelength of 1. 30 m 7. 1 ⁇ 9. 0 is preferably set to Myupaiiota.
- each stress applying section 2 is set to 22 to 28 ⁇ , and the stress is applied. part 2, 2 interval between each and 1 3 ⁇ 1 6 ⁇ ⁇ and the mode birefringence 3 X 1 0- 4 or more, wavelength 1.5 5 mode field diameter at ⁇ 8. 5 ⁇ 1 0. It is preferable to set the structure parameter of the polarization-maintaining optical fiber of the present invention within the above range.
- Polarization maintaining characteristics of the polarization-maintaining optical fiber the two orthogonal polarization modes (X-polarization, y-polarization) of the polarization-maintaining optical fiber for the equivalent refractive index n x, the difference n y (n x —N y ) is known to depend on the mode birefringence B. As the mode birefringence B increases, the propagation constant difference between the two polarization modes increases, and the polarization maintaining optical fiber The polarization maintaining characteristics of the bar are improved.
- the mode birefringence B is expressed by the following equation (1) (PL Chu et. Al: "Analytical Method for Calculation of Stress and Material Birefringence in Polarization-Maintaining Optical Fiber, "J. of Lightwave Technol. Vol. LT-2, No.5, Oct. 1984)
- B is the mode birefringence
- E is the Young's modulus of quartz
- C is the photoelastic coefficient
- V is the Poisson's ratio
- ⁇ 2 is The thermal expansion coefficient of the cladding 3
- ct 3 is the thermal expansion coefficient of the stress applying section 2
- T is the difference between the melting point of the stress applying section 2 and the actual use environment temperature
- dt is the stress applying section 2
- (1 2 is the distance between the center of the core 1 and the center of the stress applying section 2
- b is the radius of the cladding 3.
- the factor represented by can be determined by the material of the stress applying section 2.
- B 2 ⁇ 3 added quartz is used as the material of the stress applying section 2, and the amount of boron added is It is desirable that the weight be 21% by weight or less in terms of the cross-sectional weight of the polymer (see, for example, Japanese Patent Publication No. 2002-214446).
- the material of the stress applying part 2 is empirically known as: E 7830 kg / mm 2 , v: 0.186, (H 2 — H 3 ) T: 1. by using a value of 6 9 X 1 0 one 3, a typical stress applying portions 2 material can be expressed.
- each stress applying section 2 is increased, and the stress applying sections 2, 2 It can be seen that the interval R between them should be reduced.
- the mode birefringence B can be increased by reducing the distance R between the stress applying sections 2.
- the distance R between the stress applying parts 2 and 2 cannot be smaller than the diameter of the core 1.
- the diameter of the mode field 4 or the mode field diameter (MFD) is such that the electric field intensity due to light propagation is 1 / e times (e is the natural logarithm) the center of the core 1 The diameter of the part.
- the mode field 4 becomes non-circular due to the effect that the stress applying part 2 has a lower refractive index than the cladding 3, and the connection loss increases. There is a possibility that it will be large.
- the non-circularity of the mode field 4 is set to 3 in order to reduce the connection loss to about 0.3 dB or less, as described in Japanese Patent Application No. 2001-2109648. It is preferably at most 2%. For this reason, it is preferable that the distance R between the stress applying parts 2 is as large as possible. From the results shown in FIG. 2, the diameter D of the stress applying part 2 is preferably 21 to 32 ⁇ m.
- the thickness of the cladding 3 located outside the stress applying section 2 becomes thin, and the manufacturing becomes difficult. Is preferably within the range.
- the mode birefringence B is found to clad diameter 1 2 5 ⁇ ⁇ If polarization maintaining optical fiber, be a 3 X 1 0 one 4 more preferred. It is presumed that when the clad diameter is about 80 ⁇ m, the influence of the lateral pressure becomes more liable. If the diameter is at least 3 ⁇ 10— “ 1 or more, it is considered that good polarization retention characteristics can be obtained. Therefore, it can be seen from the results in FIG. 2 that the distance R between the stress applying sections 2 needs to be 17 ⁇ m or less.
- Equation (4) is the radius of the mode field 4 of the first polarization-maintaining optical fiber
- W 2 is the radius of the mode field 4 of the second polarization-maintaining optical fiber
- d is the first and the second. This is the deviation (axis deviation) of the center of the core 1 between the second polarization maintaining optical fibers.
- equation (4) becomes the following equation (6)
- a connection loss that can occur when two polarization-maintaining optical fibers are connected is preferably 0.5 dB or less.
- the mode field diameter (diameter) is preferably 6 ⁇ or more in order to reduce the connection loss due to a 1 ⁇ m axis deviation to 0.5 dB or less. Therefore, the distance R between the stress applying parts 2 must be at least 6 ⁇ m or more.
- Polarization-maintaining optical fibers for connection between optical components used in optical communication are often used in a wavelength of 0.98 ⁇ band, 1.30 ⁇ band, or 1.55 m band.
- the 0.98- ⁇ m polarization-maintaining optical fiber is used as a bigtail for connecting an excitation laser of an erbium-doped optical fiber amplifier (EDFA), for example.
- EDFA erbium-doped optical fiber amplifier
- 1 Polarization-maintaining optical fibers for the 30 ⁇ band and for the 1.55 / zm band are used, for example, as bigtails for connecting semiconductor lasers and modulators.
- the cut-off wavelength is determined by the transmission band wavelength, and the size of the MFD is also substantially determined.
- FIG. 4 shows the result of determining the connection loss when the optical fiber having a different MFD is connected with an axis deviation of 1 ⁇ to the conventional polarization maintaining optical fiber using the above equation (4).
- the MFD of the 0.98 ⁇ band polarization maintaining optical fiber of the present embodiment should be 5.3 ⁇ m or more. It turns out that it is necessary. If the MFD is too large, the splice loss increases due to mode field 4 mismatch.Therefore, the MFD at a wavelength of 0.98 ⁇ m should be in the range of 5.3 to 6.5 ⁇ m. Is preferred.
- the distance R between the stress applying portions 2 is within a range of 8.5 to 11 ⁇ . If the distance R is less than 8.5 ⁇ m, the distance between the stress applying part 2 and the core 1 becomes too small, and the mode field 4 becomes non-circular, which may lead to an increase in connection loss. On the other hand, if the interval R exceeds 11 ⁇ m, it is not preferable because the polarization maintaining characteristic is deteriorated.
- the typical value of MFD is 10.5 ⁇ .
- the connection loss was calculated by the above equation (4), the results were as shown in Fig. 5. From this result, in order to reduce the connection loss to 0.5 d ⁇ or less, the MFD of the polarization maintaining optical fiber for the 1.40 to 1.63 ⁇ m band of this embodiment has a wavelength of 1. It can be seen that at 55 ⁇ , it is necessary to be 8.0 ⁇ or more.
- the MFD is preferably in the range of 8.5 to 10.5 ⁇ .
- the distance R between the stress applying sections 2 is preferably in the range of 13 to 16 ⁇ . If the distance R is less than 13 / m, the distance between the stress applying part 2 and the core 1 becomes too small, and the non-circularity of the mode field 4 becomes undesirably high. On the other hand, if the distance R exceeds 16 ⁇ , the polarization maintaining characteristic is undesirably deteriorated.
- the typical value of MFD is 9.0 ⁇ m.
- the connection loss was calculated by the above equation (4), the result was as shown in Fig. 6. From this result, in order to reduce the connection loss to 0.5 dB or less, the MFD of the polarization maintaining optical fiber for the 1.40 to 1.63 ⁇ m band of the present embodiment has a wavelength of 1.30 ⁇ m. It can be seen that in ⁇ m, it must be 7.1 ⁇ um or more.
- the MFD be within the range of 7.:! To 9. ⁇ ⁇ . ,.
- the distance R between the stress applying sections 2 is preferably in the range of 9 to 13 ⁇ . If the distance R is less than 9 / m, the distance between the stress applying part 2 and the core 1 becomes too small, and the non-circularity of the mode field 4 becomes undesirably high. On the other hand, if the distance R exceeds 13 ⁇ m, the polarization maintaining characteristic is undesirably deteriorated.
- the polarization maintaining optical fiber of the present invention even if the cladding diameter is reduced to about 80 ⁇ , the polarization maintaining optical fiber has excellent polarization maintaining characteristics and a cladding diameter of 125 ⁇ m. Connection loss at the time of connection with the optical fiber is extremely small. Therefore, this polarization-maintaining optical fiber is used as an optical component for optical transmission such as an optical fiber amplifier, a semiconductor laser, and a modulator, and as an optical fiber for connection used in optical measurement equipment. Thus, the bending radius of the connecting optical fiber can be reduced, and the size can be remarkably reduced as compared with the related art.
- a plurality of polarization-maintaining optical fibers for the 0.98 / im band, for the 1.30 ⁇ band, and for the 1.40-1. Band were manufactured by changing the structural parameters of the optical fiber.
- the relative refractive index difference ⁇ becomes 0.25%, 0.35%, 0.4%, 0.45%, 0.6%, 1.0%.
- a VAD base material having a core portion made of germanium (Ge) -doped quartz and a clad portion made of pure quartz was prepared.
- quartz glass was deposited on the outer periphery so as to obtain a predetermined cutoff wavelength and sintered to obtain a core clad preform of a PANDA type polarization maintaining optical fiber. Holes are drilled on both sides of the core portion of this core clad base material at predetermined positions and diameters using an ultrasonic drill, and the inner surface of the holes is ground and polished to make a mirror-finished surface, thereby producing a perforated base material. did.
- a base material of quartz tube inside the boron (B) was a B 2 0 3 of the cross section by weight concentration in terms of depositing a 2 1 wt% of the added silica of the original stress applying portions using MCVD method I got Then, the quartz tube on the outer periphery of the original base material was removed by grinding, and the outer surface was polished until it became a mirror surface, thereby obtaining a stress applying member serving as a stress applying portion of the polarization maintaining optical fiber.
- the diameter of the stress applying member is smaller than the diameter of the hole of the perforated base material by about 0.5 mm.
- the stress applying member was inserted into the perforated base material, heated in a drawing furnace, and drawn to a cladding diameter of 80 ⁇ m.
- the drawn optical fiber was coated with two layers of UV-curable acrylate resin to obtain an optical fiber.
- the coating diameter of the first layer was about 122 ⁇
- the coating diameter of the second layer was about 165 ⁇ m.
- the polarization-maintaining optical fiber obtained in this way was evaluated for transmission loss and polarization crosstalk when wrapped around a shipping bobbin.
- the coating 11 of the test optical fiber 10 was 30 to 40 mm. After the optical fiber bare wire 12 was exposed by removing it to a degree, it was fixed to the pedestal 14 using an epoxy-based adhesive 13, and the polarization crosstalk of the cured optical fiber wire 10 was measured.
- Tables 1 to 6 show these results together with the structural parameters of each polarization-maintaining optical fiber.
- Example 1-1 Example 1-2
- Example 1-3 Example 1-4
- Example 1-5 Example 1-6 Structure /
- Relative refractive index difference ⁇ (%) 0.25 0.35 0.4 0.45 0.6 1.0 Diameter of stress applying part D (urn) 23 23 23 23 23 23 23 Ratio between spacing R between stress applying parts and mode field diameter MFD 1.6 1.6 1.6 1.6 1.6 1.5 Spacing between stressed parts R m) 16.8 16.0 14.8 14.2 11.9 8.9 Mod field diameter at wavelength 1.55 um MFD (m) 10.5 10.0 9.2 8.8 7.4 6.0 Characteristic measurement results ''
- Example 1-7 Example 1-3
- Example 1-9 Example 1-10
- Relative refractive index difference ⁇ (%) 0.25 0.35 0.4 0.45 0.6
- Example 2-7 Example 2-8 Example 2-3 Example 2-9 Example 2-10 Example 2-11 Structure Eight. Lameta
- Example 3-1-Example 3-2 Example 3-3
- Example 3-4 Example 3-5
- Example 3-6 Structure ⁇ °
- Relative refractive index difference ⁇ (%) 0.25 0.3 0.4 0.45 0.6 1.0 Diameter of stress applying part D im) 23 23 23 23 23 23 23 Ratio between spacing R between stress applying parts and mode field diameter MFD 1.6 1.6 1.6 1.6 1.6 1.6 Spacing between stressed parts R (m) 15.4 12.5 11.5 11.1 8.9 8.5 Mod field diameter at wavelength 1.30 m FD (m) 9.6 7.8 7.2 7.1 5.7 5.2 Characteristic measurement results
- Table 1 shows that stress was applied to the polarization maintaining optical fiber for the 1.40 to 1.63 / m band in order to evaluate the effect of the stress applying section 2 on the mode field 4 of the optical fiber equally.
- a comparison is shown in which the ratio between the relative spacing R and the MFD is kept constant and the relative refractive index difference ⁇ is changed.
- the polarization-maintaining optical fibers of Examples 1-1, 1, 1-2, 1-3, and 1-4 have a splice loss when spliced with a polarization-maintaining optical fiber with a cladding diameter of 125 ⁇ m.
- Examples 1-5 and Examples 1-6 are extremely low.
- the polarization cross-talk during the application of the adhesive and the winding of the pobin is suppressed to be smaller in the case of Examples 1-2, 1-13, and 1-14 than in the case of Examples 1-11, It can be seen that both the connectivity and the polarization maintaining characteristics are compatible.
- Table 2 shows that, for the polarization maintaining optical fiber for the 1.40 to 1.63 m band, the relative refractive index difference ⁇ and MFD were kept constant, and the distance R between the stress applying sections 2 was 2. The comparison in which is changed is shown.
- Table 3 shows that, for the 0.98 m polarization-maintaining optical fiber, the effects of the stress applying section 2 on the mode field 4 of the optical fiber were evaluated equally, and the stress applying section spacing R and MFD were used.
- Figure 2 shows a comparison in which the relative refractive index difference ⁇ is changed while keeping the ratio of the optical fibers constant.
- the polarization-maintaining optical fibers of Examples 2-1, 1, 2 and 2, and 2 and 4 have a cladding diameter of 1 2
- the splice loss when fusion spliced with a 5 ⁇ m polarization-maintaining optical fiber is much lower than those in Examples 2-5 and 2-6.
- the polarization crosstalk during application of the adhesive and the bobbin winding is reduced to a lesser extent in Examples 2-2, 2-3 and 4-2 than in Example 2-1. It can be seen that both the connectivity and the polarization maintaining characteristics are compatible. '
- Table 4 shows a comparison of the 0.98 ⁇ -band polarization maintaining optical fiber with the relative refractive index difference ⁇ and MFD kept constant and the distance R between the stress applying sections 2 and 2 changed. Show.
- Table 5 shows that, for the 1.30 im polarization maintaining optical fiber, the stress applying section 2 and the stress applying section interval R were evaluated in order to evaluate the effects of the stress applying section 2 on the mode field 4 of the optical fiber equally. This shows a comparison with the relative refractive index difference ⁇ changed while keeping the ratio with the MFD constant.
- the polarization-maintaining optical fibers of Examples 3-1, 1, 3-2, 3-3, and 3-4 have a splice loss when spliced with a polarization-maintaining optical fiber with a cladding diameter of 125 ⁇ .
- Example 3-5 extremely lower than those of Examples 3 -6.
- the polarization crosstalk during adhesive application and bobbin winding was reduced to a smaller extent than in Example 3-1. It can be seen that both the connectivity and the polarization maintaining characteristics are compatible.
- Table 6 shows a comparison of the polarization maintaining optical fiber for the 1.30 ⁇ band with the relative refractive index difference ⁇ and MFD kept constant and the distance R between the stress applying sections 2 and 2 changed. Show.
- an optical fiber amplifier was manufactured by the following procedure.
- a base material for an erbium-doped optical fiber (EDF) was manufactured as the core clad base material, and a polarization maintaining EDF having a cladding diameter of 80 ⁇ m was manufactured by the same manufacturing method as described above. Table 7 shows the characteristics of this EDF.
- Mode birefringence B (X10-4) 4.8 E Crosstalk by T-saw winding (dB / 100m) -30.5
- This optical fiber amplifier has a general configuration, and includes a signal light input port 101, a pump light input port 102, and a 980 nm—155 nm nm polarization maintaining optical power amplifier. 0, a polarization maintaining EDF 104, a signal light output port 105, and two polarization maintaining optical isolators 106, 106. These components are connected by a connection optical fiber 107.
- the bending radius of the connecting optical fiber 107 can be reduced to 20 mm or less.
- the external dimensions were 140 mm ⁇ 90 mm ⁇ 15 mm.
- the connecting optical fiber 107 the polarization maintaining optical fiber for the 1.40 to 1.63 ⁇ m band of the above Example 1-3 and 0.98 ⁇ m of the above Example 2-3 are used.
- the bending radius of the connecting optical fiber 107 is set to about 13 mm, and the outer dimensions of the optical fiber amplifier are set to 90 mm X 70 mm X 15 mm.
- We were able to. We were able to manufacture a polarization-maintaining optical fiber amplifier that was about half as small in volume.
- the polarization maintaining optical fiber of the present invention even if the clad diameter is reduced to 70 to 90 ⁇ , more preferably, it is excellent even if the diameter is reduced to 77 to 83 ⁇ .
- the connection loss when connecting to an optical fiber with a cladding diameter of 125 ⁇ m is extremely small.
- this polarization-maintaining optical fiber as an optical fiber for optical transmission such as an optical fiber amplifier, a semiconductor laser, and a modulator, and as an optical fiber for connection used in an optical measuring instrument, the optical fiber for connection is bent.
- the radius can be reduced, and the size can be significantly reduced as compared with the related art.
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EP03712678.6A EP1486804B1 (en) | 2002-03-15 | 2003-03-13 | Polarization preserving optical fiber |
US10/937,495 US7289687B2 (en) | 2002-03-15 | 2004-09-10 | Polarization-maintaining optical fiber |
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JP2002073194 | 2002-03-15 | ||
JP2002-073194 | 2002-03-15 | ||
JP2003-051194 | 2003-02-27 | ||
JP2003051194A JP3833621B2 (ja) | 2002-03-15 | 2003-02-27 | 偏波保持光ファイバ |
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EP (1) | EP1486804B1 (ja) |
JP (1) | JP3833621B2 (ja) |
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WO2023119925A1 (ja) * | 2021-12-24 | 2023-06-29 | 住友電気工業株式会社 | 屈曲光ファイバ、屈曲光ファイバの製造方法、および光接続部品 |
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JP3833621B2 (ja) * | 2002-03-15 | 2006-10-18 | 株式会社フジクラ | 偏波保持光ファイバ |
JP2004207677A (ja) * | 2002-11-07 | 2004-07-22 | Nippon Telegr & Teleph Corp <Ntt> | 光デバイスおよび増幅媒体用光ファイバ |
US7280730B2 (en) | 2004-01-16 | 2007-10-09 | Imra America, Inc. | Large core holey fibers |
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JP2007010896A (ja) * | 2005-06-29 | 2007-01-18 | Fujikura Ltd | 偏波保持光ファイバ及び光ファイバジャイロ |
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US10261246B2 (en) | 2016-12-14 | 2019-04-16 | Ofs Fitel, Llc | Polarization-maintaining fiber device supporting propagation in large mode field diameters |
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WO2023145863A1 (ja) * | 2022-01-31 | 2023-08-03 | 株式会社フジクラ | 偏波保持ファイバ |
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Also Published As
Publication number | Publication date |
---|---|
EP1486804A4 (en) | 2005-06-01 |
EP1486804B1 (en) | 2017-10-11 |
EP1486804A1 (en) | 2004-12-15 |
JP3833621B2 (ja) | 2006-10-18 |
CN1323303C (zh) | 2007-06-27 |
US20050031280A1 (en) | 2005-02-10 |
JP2003337238A (ja) | 2003-11-28 |
CN1643418A (zh) | 2005-07-20 |
US7289687B2 (en) | 2007-10-30 |
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