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WO2004066007A1 - Fibre optique, intensificateur lumineux et source lumineuse - Google Patents

Fibre optique, intensificateur lumineux et source lumineuse Download PDF

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Publication number
WO2004066007A1
WO2004066007A1 PCT/JP2004/000141 JP2004000141W WO2004066007A1 WO 2004066007 A1 WO2004066007 A1 WO 2004066007A1 JP 2004000141 W JP2004000141 W JP 2004000141W WO 2004066007 A1 WO2004066007 A1 WO 2004066007A1
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WO
WIPO (PCT)
Prior art keywords
light
optical fiber
fiber
optical
output
Prior art date
Application number
PCT/JP2004/000141
Other languages
English (en)
Japanese (ja)
Inventor
Koji Seo
Nishimura Naoya
Original Assignee
The Furukawa Electric Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Furukawa Electric Co., Ltd filed Critical The Furukawa Electric Co., Ltd
Priority to JP2005508026A priority Critical patent/JP4330017B2/ja
Priority to US10/541,523 priority patent/US7400808B2/en
Publication of WO2004066007A1 publication Critical patent/WO2004066007A1/fr
Priority to US12/135,635 priority patent/US7747120B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • 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
    • G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/4482—Code or colour marking

Definitions

  • the present invention relates to an optical fiber used in an optical communication system, an optical amplifier such as a Raman amplifier and a rare-earth doped optical amplifier, and an optical source.
  • a broadband optical amplifier that can amplify a broadband signal light at a time is increasing.
  • a Raman amplifier and a rare-earth-doped fiber amplifier are considered to be amplifiers that meet the requirements.
  • the Raman amplifier uses the stimulated Raman scattering effect to amplify signal light. In order to generate the stimulated Raman scattering effect of this Raman amplifier efficiently, high-output pump light is required.
  • the Raman amplifier has been described above, the same can be said for a propagated signal light and a rare earth-doped fiber amplifier such as an EDFA.
  • high output light is propagated.
  • weak light such as signal light may become high power if it is multiplexed with a multiplexer such as an AWG.
  • a laser element used in combination with an EDFA its output may be increased.
  • the first problem is that the coating material of the optical fiber is burned. In the optical communication system, while the output of light is increasing, the necessity of mounting optical components at a high density for the purpose of further downsizing optical amplifiers and light sources is increasing.
  • a coating material covering an outer peripheral portion thereof absorbs hyper light leaked from a core and generates heat. For this reason, the small curvature diameter portion of the optical fiber is used at high temperatures. As a result, the coating material may deteriorate faster than before, and the optical fiber may be easily broken.
  • one object of the present invention is to solve the above-described conventional problems and to provide a high-output light In an optical fiber that propagates light, even if it is bent with a small radius of curvature, there is no problem such as deterioration of the coating material due to the optical power leaking from the core of the optical fiber through the cladding and the coating material.
  • Another object of the present invention is to provide an optical fiber that can transmit high-output light without any problem.
  • the second problem associated with increasing the output power of optical power is a problem related to a so-called fiber fuse.
  • the central portion of the optical fiber becomes First, it melts locally. Then, this melting phenomenon causes self-transmission toward the light source, that is, a so-called fiber fuse phenomenon occurs.
  • This fiber fuse phenomenon proceeds at a speed of about lmZs and continues as long as the optical transmission from the optical amplifier and the light source is stopped or the optical energy density in the optical fiber does not fall below a certain threshold. After the optical fiber has been transmitted by the fused portion, a transmission mark (cavity) is formed in the core, and the light is not transmitted.
  • Fiber fuse is a phenomenon that is most likely to occur when high-power light is transmitted with a light energy density above a certain threshold or is locally heated. For this reason, fiber fuses do not necessarily occur even if the area around the core is locally heated. Moreover, it occurs only when certain conditions are satisfied, and its occurrence probability is extremely low.
  • Another object of the present invention is to solve the above-mentioned conventional problems and to enable transmission of a high-power optical signal without generating or transmitting a fiber fuse phenomenon in an optical fiber.
  • the purpose of the present invention is to provide an optical signal transmission method and a control method. Disclosure of the invention
  • the present inventors have conducted intensive studies to solve the above-mentioned problems.
  • a coating material that absorbs less leaked light in an optical fiber that propagates high output light.
  • an optical fiber that can stably transmit high-output light without damaging the optical fiber has been found.
  • the coating layer of the optical fiber is composed of a primary coating layer, a secondary coating layer, and a coloring layer made of an ultraviolet curable resin, and the coloring layer has a surrounding layer.
  • the coloring layer has a surrounding layer.
  • the present inventors have found optical devices (optical amplifiers and light sources) using the above optical fibers and optical fiber cables connected to optical devices using the above optical fibers.
  • Disconnection of the optical fiber due to deterioration of the coating, which is a problem of the prior art, and ignition of the coating layer are further caused on the outer periphery of the optical fiber coated with the primary coating layer and the secondary coating layer made of the ultraviolet curing resin.
  • the primary coating layer and the secondary coating layer made of the ultraviolet curing resin When a colored layer is applied, it is considered that the energy of the leaked light that reaches the coating layer through the glass clad layer does not pass through the colored layer but is reflected and absorbed in the coating layer to generate heat.
  • the present inventor has performed various analyzes and experiments to determine whether fiber fuse transmission can occur.
  • the required minimum optical power P th (W) fiber fuse transmission threshold
  • the power P (W) of the propagating light can be controlled using the minimum optical power P th that is found.
  • FIG. 1 is a diagram showing an outline of a bending test apparatus for an optical fiber of the present invention and a conventional optical fiber.
  • FIG. 2 is a diagram showing a change in outer surface degree in a bending test of the optical fiber of the present invention and a conventional optical fiber.
  • FIG. 3 is a table showing bending test results of the optical fiber of the present invention and a conventional optical fiber.
  • FIG. 4 is a diagram showing an outline of a measuring device for measuring a fiber fuse transmission threshold value P th (W).
  • FIG. 5 is a diagram comparing the measurement results of the fiber fuse transmission threshold value P th (W) of the SMF, DSF, and DCF.
  • FIG. 6 is a diagram showing the relationship between the fiber fuse transmission threshold value P th (W) and the MFD.
  • FIG. 7 is a diagram showing a configuration diagram of an embodiment of a high-power wavelength-division multiplexing pump light source used for Raman amplification.
  • FIG. 8 is a flowchart showing a signal light transmission method for controlling the total output power P to be smaller than the fiber fuse transmission threshold Pth .
  • FIG. 9A is a diagram showing damage to the end face of the optical fiber.
  • FIG. 9B is a diagram showing damage to the end face of the optical fiber.
  • FIG. 9C is a diagram showing damage to the end face of the optical fiber.
  • FIG. 10 is a table showing the results of a damage test on the end of the optical fiber.
  • FIG. 11 is a diagram showing the effect of the high-power transmission on the coating layer.
  • Fig. 12 is a diagram showing the results of an experiment in which a 5-minute wire test was performed in a high-power transmission experiment.
  • FIG. 13 is a cross-sectional view showing a conventional optical fiber whose entire surface is covered with a colored layer.
  • FIG. 14 is a cross-sectional view showing an optical fiber having an intermittent colored layer according to the present invention.
  • FIG. 15 is a side view showing an optical fiber having a striped colored layer.
  • FIG. 16 is a side view showing an optical fiber having a spiral-stripe colored layer.
  • UV-curable resins In conventional optical fibers, urethane acrylate, epoxy acrylate, silicon-based UV-curable resin compositions (hereinafter referred to as UV-curable resins), nylon resins, etc. are used as the coating material.
  • the coating is colored for optical fiber identification. Accordingly, when the optical fiber is bent with a small radius of curvature, the coating absorbs the optical power that tends to leak to the outside through the core and clad of the optical fiber, and generates heat. Previously, low propagating optical power did not generate enough heat to cause problems. In the future, due to the higher output of signal light and pumping light to be propagated, the coloring of the coating material absorbs the power of the leaked light of the transmitted signal light and generates heat, which generates heat and damages the coating material.
  • the optical fiber may be broken.
  • a transparent uv resin is used as a material for coating the optical fiber. Accordingly, when transmitting high-power light, the optical fiber is bent with a small radius of curvature, and even if leakage light occurs due to this bending, the amount of optical power absorbed by the coating material is greatly reduced. . Therefore, this coating material is not damaged by heat generation, and can continue to transmit high-output light as it is.
  • a test was conducted in which high-power light was propagated in a state where the optical fiber was bent to an arbitrary curvature diameter together with a conventional optical fiber.
  • FIG. 1 shows an outline of an apparatus for a bending test performed on the optical fiber of the present invention and a conventional optical fiber.
  • the optical fiber for the test includes an optical fiber coated with the transparent UV-curable resin of the present invention, and three types of optical fibers coated with white, blue, and green UV-curable resins, respectively, as conventional optical fibers. And a total of four types of optical fibers covered with a white nib.
  • an optical fiber coated with a UV curable resin is used in an optical device, and an optical fiber coated with a nylon is often used as an optical fiber connecting optical devices.
  • the outer diameter of the optical fiber is 250 m for the optical fiber coated with the UV curable resin, and the outer diameter for the optical fiber coated with nylon is 900 ⁇ m.
  • the output P (unit: W) of a laser light source having a wavelength of 148 O nm was changed in three stages of 1 W, 2 W, and 3 W.
  • the output of each laser The bending diameter A (unit: mm) was changed in five steps of 30 mm, 2 O mm, 15 mm, 1 O mm, and 5 mm, and the state of degradation of the coating material was observed.
  • the temperature change of the outer surface of the optical fiber was measured with a thermocouple.
  • the temperature change was measured under the most severe conditions, with the output P of the laser source set to a maximum of 3 W and the bending diameter A of the optical fiber set to 3 mm.
  • Figure 2 shows the results of the temperature measurement.
  • the optical fiber coated with the transparent UV curable resin of the present invention and the conventional optical fiber coated with a white UV curable resin were measured.
  • the vertical axis of the graph is temperature (unit: C)
  • the horizontal axis is time (unit: minute).
  • the temperature rises rapidly about 1 minute after passing through, and in about 2 to 3 minutes, the heat generated by the leaked light and the heat radiation from the outer surface are balanced, and the temperature is in an equilibrium state It has become.
  • the surface temperature of an optical fiber coated with a conventional white UV curable resin reached about 100 ° C.
  • the optical fiber coated with a transparent UV curable resin according to the present invention has a surface temperature of about 100 ° C.
  • the table in FIG. 3 shows the relationship between the optical fiber of the present invention (UV (transparent)) and four types of conventional optical fibers (UV (white), UV (blue), UV (green), and Nylon (white)). It shows the results of the comparative test.
  • bending diameter A is 30 mm, 2 O mm, 15 mm, 10 mm, and 5 m for each optical fiber. The observation result in the case of m is shown.
  • the optical fiber coated with the transparent UV curable resin of the present invention did not cause any damage at any bending diameter.
  • the coating material absorbs the leaked light and is damaged, and the optical fiber becomes hazy (deformed).
  • the covering material absorbs the leaked light and is damaged, causing the optical fiber to be damaged.
  • the material was dissolved, and the optical fiber itself was exposed.
  • the input light intensity P was 2 W
  • the optical fiber coated with the transparent UV-curable resin of the present invention did not cause any damage up to a bending diameter of 1 Omm.
  • the coating material turned brown.
  • the coating material When the bending diameter of all three colors of the optical fiber coated with the colored UV curable resin became 15 mm or less, the coating material absorbed the leaked light and was damaged, causing the optical fiber to become distorted. When the bending diameter was 5 mm or less, the coating material turned brownish in all three colors.
  • the covering material absorbs the leaked light and is damaged, and the fiber is damaged by the optical fiber, and the bending diameter is 5 mm or less. Then, the coating material broke.
  • the optical fiber coated with the transparent UV curable resin of the present invention did not cause any damage when the bending diameter was 1 O mm or more.
  • the bending diameter of the optical fiber was 5 mm or less, the material discolored brownish.
  • the coating material will absorb the leaked light and be damaged, causing damage to the optical fibers.
  • Green fiber has a bend diameter of 20 m At less than m, the cladding absorbed the leaked light and was damaged, resulting in a hazy optical fiber.
  • the coating material changed color for all three colors.
  • the covering material absorbs the leaked light and is damaged, causing the optical fiber to be damaged.
  • the bending diameter is 5 mm or less, The coating broke.
  • the optical fiber coated with the transparent UV-curable resin of the present invention has a high power of up to 3 W without any damage if the bending diameter is 1 O mm or more. Light could be transmitted.
  • the optical fiber coated with nylon was more severely damaged, and if the bending diameter was reduced to 5 mm or less, the coating material was melted or disconnected.
  • the optical fiber of the present invention has much better performance than the conventional optical fiber with respect to the damage resistance performance due to leakage light generated by bending.
  • the optical fiber having the coating material made of the transparent UV-curable resin described above is bent and installed in an optical device, a functional unit that absorbs leaked light outside the optical fiber is used. Goods may be arranged.
  • a functional unit that absorbs leaked light outside the optical fiber is used. Goods may be arranged.
  • the package member may be provided with a light-absorbing film on at least the inner surface thereof.
  • the package member may be provided with a temperature adjustment function.
  • Tight bending of optical fibers is not allowed due to long-term reliability, but short-term bending may be added in actual system installation. Severe bending causes light to leak from the core to the coating, and in high-power environments, the light leaks and generates heat, which in turn can lead to degradation of the coating.
  • the present inventors conducted the following tests on coating damage when bending is applied for a short period in a high-power environment.
  • the optical fiber used in the experiment of the present invention is a single mode fiber based on ITU-T G.625, and the coating layer of the optical fiber is composed of a primary coating layer and a secondary coating layer made of an ultraviolet curable resin. Of two-layer coating.
  • a soft resin with a Young's modulus of about 0.5 to 1 OMPa at room temperature is used for the primary coating layer of the optical fiber to prevent the influence of external force from being transmitted to the glass.
  • a hard resin having a Young's modulus at normal temperature of 100 to 100 MPa is used for protection.
  • Other properties include T g (glass transition temperature) A material with a temperature of 20 to 10 ° C is used as the coating material and a temperature of 60 to 120 ° C is used as the secondary coating material.
  • the refractive index of the coating layer is preferably used in a combination that increases from the glass clad to the primary coating layer and the secondary coating layer toward the outer periphery.
  • the ultraviolet-curable resin used in the present invention is a polyether-polyurethane acrylate-based ultraviolet-curable resin, has a thickness of 200 / zm, and is evaluated in a sheet at a UV irradiation amount of 500 mJm2 in air under air.
  • a resin having a Young's modulus of 1. OMPa, Tg-5 and a refractive index of 1.49 was used for the primary coating layer.
  • the secondary coating layer was made of a resin having a Young's modulus of 8 O OMPa, Tg of 90 ° C, and a refractive index of 1.53.
  • Optical fiber used in the present invention is a single mode off Aipa glass diameter 125 Myuitaiota, the primary coating layer diameter 195 Myupaiiota, whereas Oh ⁇ in the secondary coating layer diameter 245 ⁇ ⁇ , colored layer Not It is formed by adding various pigments or dyes to a cured ultraviolet-curable resin liquid, applying the pigment or dye uniformly to the coated fiber, and curing by UV irradiation. At this time, the greater the amount of the pigment or dye added, the deeper the color and color tone of the colored layer and the more easily distinguishable the color. Will decrease.
  • the transmittance of the colored layer can be measured with an ultraviolet spectrophotometer by preparing a colored ultraviolet curable resin film having the same thickness as the colored layer using a spin coater or the like. It can be obtained as a percentage (12 / 11X100) of the intensity I 1 of the light incident on the film and the intensity 12 of the light passing through it.
  • the colored layer is formed as a thin film having a thickness of 3 to 10 microns, but the diphotoinitiator used for the colored ultraviolet curing resin is a diphenylketone or aminoketone compound, and the absorption wavelength is It is approximately 330-420 nm.
  • a colored resin having a thickness of 10 microns and a transmittance of 5% or more is usually used.
  • the colored ultraviolet curable resin in the present invention is a clear resin containing no pigment, and has a normal temperature Young's modulus in sheet evaluation at a UV irradiation dose of 500 mJ / cm2 under air at a thickness of 40 / zm. A resin having characteristics of 1100 MPa and TglO 0 ° C was used.
  • the coloring of the coloring resin used in the experiment of the present invention is blue and green, and the transmittance of each colored resin is 5% or more.
  • the colored core wire constituting the present invention has a structure in which a colored layer having a thickness of 5 ⁇ is applied to the outer periphery of the optical fiber according to each of Examples and Comparative Examples.
  • the ratio of the colored layer of the colored optical fiber core to the optical fiber is preferably 30 to 80%, more preferably 40 to 70% of the outer peripheral surface area of the optical fiber. If it is lower than 30%, it will be difficult to identify, and if it is higher than 80%, deformation will occur due to the effect of light leakage.
  • Example 1 was applied to a stripe at three places on the circumference of the optical fiber so that the coloring was alternated with the non-colored layer at about 50% of the outer surface area of the optical fiber. (See FIGS. 14 and 15.)
  • FIG. 13 shows a cross-sectional view of a conventional optical fiber having a colored layer on the entire surface.
  • Coloring was applied on the stripe at three places on the circumference of the optical fiber hatch wire so as to alternate with the non-colored layer at about 50% of the outer surface area of the optical fiber.
  • the optical fiber was twisted at the time of coloring so that the stripe became spiral. (See Fig. 16.)
  • the method of twisting is the same as the method of twisting an optical fiber while drawing to improve PMD characteristics. At the position after passing through the UV lamp, twisting is applied to form a striped spiral. The state formed.
  • Comparative Example 1 Comparative Example 1 was made by uniformly applying coloring on the outer periphery of the optical fiber.
  • Fig. 11 is a diagram of an experimental device for the effect of high power transmission on the coating layer.
  • the output of the laser light source was P [W] and the bending diameter was A [ram].
  • a light source with a center wavelength of 1480 nm and a maximum of 3 W was used.
  • Example 1 In Comparative Example 1, when the diameter was 2 Omm and the power was 3 W, deformation of the UV coating layer of the green fiber core wire (a state in which the habit was not restored) was observed. At diameters of 10 and 15 mm, deformation of the UV coating layer was observed for both the blue and green core wires at 2 W or more. On the other hand, in Example 1, no change was observed at a diameter of 15 mm or more. However, at a diameter of 1 O mm, deformation of the UV coating layer was observed for both the blue and green core wires.
  • Example 2 no change was observed under all conditions. It is thought that if the stripe coloring is made spiral, the intermittent coloring is uniform in both the radial and length directions of the surface of the strand, and it is considered that deformation becomes difficult.
  • the output of propagating signal light and pumping light is increasing, and the possibility of fire perfuse is increasing.
  • the relationship between the minimum optical power required for fiber fuse transmission (fiber fuse transmission threshold value P th ), the wavelength of the light source, the type of optical fiber, the type of dopant, and the MFD has been found. In other words, if the power of the propagating light is P, p ⁇ p th
  • Figure 4 shows the outline of a measuring device for measuring the full multiplexing fuse propagation ⁇ P th.
  • a light source that generates a maximum power of 5 W at a wavelength of 1664 nm or 1467 nm is connected to the optical fiber to be measured. Then, the power of the input light is increased, the optical fiber is locally heated, and a fiber fuse is generated at the heated portion. After that, when the power of the light source was lowered and the firefuse was extinguished, 0141
  • the optical power was set as the fiber fuse transmission threshold P. Therefore, this value is a value on the very safe side, and it is considered that firefighting is unlikely to occur with light having a power less than this value.
  • Figure 5 shows the single mode fiber (SMF), dispersion shifted fiber (DSF), and dispersion compensation fiber (DCF) fiber transmission at wavelengths of 1064 nm and 1467 nm.
  • SMF single mode fiber
  • DSF dispersion shifted fiber
  • DCF dispersion compensation fiber
  • FIG. 5 shows that the relationship between this wavelength and the fiber fuse transmission threshold is determined by the type of optical fiber.
  • the MFD (Mode Field Diameter) of the SMF is around ⁇ ⁇
  • the MFD of the DSF is around 7 to 8 ⁇
  • the MFD of the DCF is around 4 to 5 ⁇ .
  • MFD is smaller in the order of SMF, DSF, and DCF.
  • the fiber fuse transmission threshold value P th is in the order of SMF, DSF, and DCF.
  • Fig. 6 shows the relationship between the fiber fuse transmission threshold Pth and the MFD.
  • Data was measured using SMF, DSF, DCF, and other fibers with large MFD.
  • a fiber having a large MFD there is a thermal-diffused expanded core fiber (hereinafter referred to as 1 EC fiber).
  • the TEC fiber is a fiber in which the MFD (mode field diameter) of the optical fiber is locally enlarged by heat diffusion technology.
  • the vertical axis of the graph is the threshold (unit: W), and the horizontal axis is the MFD (unit: ⁇ ).
  • the experimental results show that the fiber fuse transmission threshold P th of the optical fiber is most affected by the size of the MFD. Other factors affecting the light transmission threshold Pth include: 0141
  • the relationship between the firefuse transmission threshold P th and the MFD has a quadratic approximation correlation.
  • the relationship between the two is a linear function; the Pth-O-ISX optical fiber MFD ( ⁇ ⁇ ) Or a similar correlation.
  • a predetermined fiber fuse transmission threshold value P th can be obtained based on the type and specification of the optical fiber as the transmission path and the wavelength of the signal light and the pump light to be transmitted.
  • Fig. 7 shows a configuration diagram of a high-power wavelength-division multiplexed pump light source used for Raman amplification.
  • This high-power wavelength-division multiplexing pump light source includes a total of seven laser elements of five types of wavelengths. The wavelength of this laser device is stabilized by an FBG, a multilayer filter, and the like. The pump light generated from these laser elements is subjected to polarization synthesis and wavelength synthesis in a multiplexer to obtain a high-output pump light.
  • This Raman amplifier can obtain a flat gain-wavelength characteristic by changing the output power of each wavelength.
  • This figure shows a backward pumping system, in which the connection parts A and B are connected to the signal light transmission line, and the above-described high-power pump light is propagated to the signal light transmission line via a WDM force bra.
  • a part of the high-power pumping light is branched into a small amount by a tapping force brazer on the way, and transmitted to the output power monitor. With this output power monitor, the total output power of The monitor is monitored and the monitored value is fed back to the drive control circuit.
  • the drive control circuit functions to control the output of the laser element so as to generate signal light and pump light of a predetermined output.
  • This control method is shown in the flowchart of FIG. As described above, the total output power P of the pump light unit is monitored. Then, a comparison is made with a fiber fuse transmission threshold value P th for various parameters set in advance. If the total output power P is smaller than the fiber fuse transmission threshold value P th , the power to maintain the power as it is ⁇ power is increased.
  • the fiber fuse transmission threshold P If the total output power P is larger than the fiber fuse transmission threshold P, a fiber fuse may be generated, and control to reduce the power P is performed. In this case, it is important that the power be reduced while maintaining a flat gain-wavelength characteristic.
  • the Raman amplifier can obtain a flat gain-wavelength characteristic by controlling the output power of the pump light of each wavelength.However, when reducing the total power, if the power of a specific wavelength is reduced, However, the flatness of the gain-wavelength characteristic is lost, and the performance cannot be fully exhibited. In particular, since the gain spectrum generated by the pump light on the short wavelength side tends to have ripples, it is usually necessary to perform control such as reducing the number of multiplexes to reduce the gain per wavelength.
  • the present invention it is possible to propagate high-power pump light and signal light without fear of generating or transmitting a fiber fuse.
  • the transmission method of the present invention it is possible to control the power of pumping light and signal light propagating without impairing the flat gain-wavelength characteristic of a Raman amplifier and the like, which is increasingly important in the future. And stable propagation of high-power pump light and signal light becomes possible.
  • optical fiber and the method for transmitting high-power pumping light and signal light of the present invention it is possible to provide various optical devices and optical communication systems compatible with high-power light.
  • test samples according to the standard did not change as expected.
  • test samples that were scratched with less appropriate polishing conditions did not show any further damage.
  • the temperature increased but no other damage was seen. No changes were seen in the test samples with the highly transparent impurities.
  • the temperature increased but this was probably due to splice loss.
  • test samples containing light-absorbing impurities such as metals and black components even if the splice loss is small, the ends of the test sample may be damaged and fiber fuses may occur.
  • the edge was damaged even with a power of only 50 mW.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

L'invention concerne un fibre optique gainée qui comporte une matière de gainage recouvrant sa surface extérieure et qui est capable de transmettre une lumière de grande intensité. Ladite fibre se caractérise en ce que la chauffe de la matière de gainage induite par l'absorption de lumière fuyant de la fibre optique est supprimée grâce à une résine transparente durcissant sous ultraviolet. L'invention porte également sur un procédé de transmission de lumière qui se caractérise en ce qu'une valeur seuil de propagation de fusion de fibre, qui correspond à la puissance optique minimum nécessaire à la propagation d'une fusion de fibre, est trouvée et en ce que l'intensité de la lumière transmise est modulée, de sorte qu'elle soit inférieure à la valeur seuil de propagation de fusion de fibre.
PCT/JP2004/000141 2003-01-10 2004-01-13 Fibre optique, intensificateur lumineux et source lumineuse WO2004066007A1 (fr)

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JP2005508026A JP4330017B2 (ja) 2003-01-10 2004-01-13 光増幅器の制御方法
US10/541,523 US7400808B2 (en) 2003-01-10 2004-01-13 Optical fiber, light amplifier, and light source
US12/135,635 US7747120B2 (en) 2003-01-10 2008-06-09 Optical fiber, light amplifier and light source

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US43940503P 2003-01-10 2003-01-10
US60/439,405 2003-01-10

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007139857A (ja) * 2005-11-15 2007-06-07 Fujikura Ltd シングルモード光ファイバ及びファイバレーザ
US7748913B2 (en) 2007-05-15 2010-07-06 Fujikura Ltd. Fusion splicing structure of optical fibers
WO2011122306A1 (fr) * 2010-03-30 2011-10-06 株式会社フジクラ Fibre optique et dispositif laser l'utilisant
US8189979B2 (en) 2006-09-25 2012-05-29 Prysmian S.P.A. Buffered optical fibre and method for improving the lifetime thereof
JP2012215708A (ja) * 2011-03-31 2012-11-08 Fujikura Ltd 光デリバリ部品、及び、それを用いたレーザ装置
JP2017223897A (ja) * 2016-06-17 2017-12-21 三菱電線工業株式会社 光コネクタ構造

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007139857A (ja) * 2005-11-15 2007-06-07 Fujikura Ltd シングルモード光ファイバ及びファイバレーザ
US8189979B2 (en) 2006-09-25 2012-05-29 Prysmian S.P.A. Buffered optical fibre and method for improving the lifetime thereof
US7748913B2 (en) 2007-05-15 2010-07-06 Fujikura Ltd. Fusion splicing structure of optical fibers
WO2011122306A1 (fr) * 2010-03-30 2011-10-06 株式会社フジクラ Fibre optique et dispositif laser l'utilisant
JP5214821B2 (ja) * 2010-03-30 2013-06-19 株式会社フジクラ 光ファイバ、及び、これを用いたレーザ装置
US8724949B2 (en) 2010-03-30 2014-05-13 Fujikura Ltd. Optical fiber, and laser device using the same
JP2012215708A (ja) * 2011-03-31 2012-11-08 Fujikura Ltd 光デリバリ部品、及び、それを用いたレーザ装置
US9263847B2 (en) 2011-03-31 2016-02-16 Fujikura Ltd. Light delivery component and laser system employing same
JP2017223897A (ja) * 2016-06-17 2017-12-21 三菱電線工業株式会社 光コネクタ構造

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