WO2004015467A1 - Fibre optique monomodale a dispersion nulle et decalage stable pour sous-onde integrale - Google Patents

Fibre optique monomodale a dispersion nulle et decalage stable pour sous-onde integrale Download PDF

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Publication number
WO2004015467A1
WO2004015467A1 PCT/CN2003/000637 CN0300637W WO2004015467A1 WO 2004015467 A1 WO2004015467 A1 WO 2004015467A1 CN 0300637 W CN0300637 W CN 0300637W WO 2004015467 A1 WO2004015467 A1 WO 2004015467A1
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Prior art keywords
refractive index
layer
dispersion
core
wavelength
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PCT/CN2003/000637
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English (en)
Chinese (zh)
Inventor
Yeheng Wang
Original Assignee
Yeheng Wang
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Filing date
Publication date
Priority claimed from CNA021364125A external-priority patent/CN1474203A/zh
Priority claimed from CN 03141502 external-priority patent/CN1567005A/zh
Application filed by Yeheng Wang filed Critical Yeheng Wang
Priority to AU2003255096A priority Critical patent/AU2003255096A1/en
Publication of WO2004015467A1 publication Critical patent/WO2004015467A1/fr

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Classifications

    • 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
    • G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
    • G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
    • 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
    • G02B6/02276—Dispersion shifted fibres, i.e. zero dispersion 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
    • 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
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
    • 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 relates to a single-mode communication optical fiber, and in particular, to a sub-full-wave zero-dispersion stable-shift single-mode optical fiber and a dispersion-stable low-dispersion slope sub-full-wave optical fiber. Background technique
  • each layer of the core is measured in units of ⁇ m and is defined according to the refractive index.
  • Each specific layer has a first refractive index point and a final refractive index point.
  • the radius from the fiber axis to the location of the first refractive index point is the inner radius of the layer; the radius from the fiber axis to the location of the last refractive index point is the outer radius of the layer.
  • the radius of the central circular layer is measured from the fiber axis to the outer radius of the layer; the width of the first ring layer is measured from the inner radius of the first ring layer to the first ring layer The outer radius of the second annular layer is measured from the inner radius of the second annular layer to the outer radius of the second annular layer.
  • the relative refractive index difference ⁇ of the core circular center layer, the first ring layer, and the second ring layer. , A, and 2 are expressed in unit% and are defined as
  • ⁇ 2 ( ⁇ 2 2 - ⁇ ⁇ 1 2 ) / 2n 0 2
  • the refractive index profile is defined as the relative refractive index difference or the relationship between the refractive index and the radius.
  • ⁇ refractive index profile is defined as
  • the quasi-Bezier index profile with a platform is defined as
  • r is the radius of the location; a Q > 0 is the width of the platform; a is the radius of the circular central layer; ⁇ . Is the relative refractive index difference of the circular central layer; J. Is the first-order zero-order Bessel function; and c is the given parameter.
  • the effective area is in ⁇ 2 and is defined as
  • the integral limit is 0 to ⁇ ; E (r) is the electric field accompanying light propagation.
  • the integration limit is 0 to ⁇ ;
  • E (r) is the electric field accompanying light propagation.
  • Fiber bending loss Y decreases as the fiber bending loss factor a m increases, and the specific relationship is as follows:
  • R. Is the bending radius, in units of ⁇ m.
  • the partial dispersion instability SD A is measured in units of ps / nm-km, and refers to the change in fiber dispersion when the relative refractive index difference of each layer of the core changes by 2% in proportion while the refractive index profile and other structural parameters are unchanged.
  • the partial dispersion instability SD R is measured in units of ps / nm-km, which refers to the change in fiber dispersion when the radius of each layer of the core changes by 1% in proportion while other structural parameters are unchanged.
  • the total dispersion instability ⁇ D T is measured in ps / nm-km and refers to the sum of the absolute values of ⁇ 0 and ⁇ D A.
  • the zero-dispersion wavelength instability ⁇ ⁇ 0 is measured in units of nm , and refers to a change in the zero-dispersion wavelength caused by a dimensional tolerance of ⁇ 1% and a relative refractive index difference tolerance of ⁇ 2%.
  • the zero dispersion slope S Q is defined as the dispersion slope of a fiber at a wavelength of zero dispersion.
  • the dispersion stable state refers to a state in which the full dispersion instability SD T and the zero dispersion wavelength instability S ⁇ 0 are significantly smaller within the dispersion slope range S A SS a .
  • the attenuation water peak wavelength region is defined as a wavelength region with an attenuation coefficient of less than and equal to 0.35 dB / km near 1383 nm.
  • the best long-distance large-capacity communication fiber currently available—non-zero dispersion-shifted single-mode fiber has two shortcomings: The dispersion has poor stability with respect to changes in structural parameters and a small working wavelength range.
  • the reason for the poor stability of dispersion with respect to changes in structural parameters is that the theory of the influence of dispersion slope on dispersion stability has not been known before.
  • the dispersion slope of existing fibers is either too high or too low, or the variation range is too large. In short, the conditions are not met. S A SS R.
  • non-zero dispersion shifted single-mode fiber The definition of non-zero dispersion shifted single-mode fiber is problematic. Based on the non-zero dispersion value at a certain wavelength (such as 1550nm), the irrational dispersion slope and the unsatisfactory dispersion stability make the zero dispersion wavelength unstable. For example, the range of the zero dispersion wavelength can reach about 40 nm, which is equivalent to a commonly used wavelength window width.
  • ——OH in water diffuses into the optical fiber, and resonates at a wavelength of 1383 ⁇ 3nm, forming an attenuated water peak, and the region of the attenuated water peak wavelength should not be used.
  • the dispersion can only be positive or negative in the working wavelength range, and because the maximum dispersion D (absolute value) and the minimum dispersion slope S are both limited, So greatly limits the working wavelength range.
  • the utilization rate of the wavelength resources of the existing non-zero dispersion shifted single-mode optical fiber reaches only 40% of 1280 ⁇ 1625nm.
  • the existing large effective area non-zero dispersion-shifted single-mode fiber not only has an insufficient effective area, but also has lower dispersion stability and a smaller operating wavelength range than conventional non-zero dispersion-shifted single-mode fibers. Diameter and bending loss issues.
  • the existing large effective area optical fibers mainly rely on increasing the dispersion slope to increase the effective area.
  • the adopted circular core central layered refractive index profile shape is not conducive to increasing the effective area of the optical fiber, resulting in the following limitations: or dispersion slope Too large, the dispersion stability is worse; or the effective area is not large enough due to the dispersion slope limitation.
  • Typical three-wavelength window non-zero dispersion shifted single-mode fiber at zero dispersion wavelength Cannot be included in large effective area fibers;
  • the existing two-wavelength window large effective area non-zero dispersion shifted single-mode fiber cannot be widened for three wavelength windows, for two reasons: On the one hand, the zero dispersion wavelength is unstable, and the S wavelength window or C The wavelength window has nonlinear distortion. On the other hand, the effective area decreases with decreasing wavelength. The effective area in the S wavelength window is not large enough. Therefore, the maximum working wavelength range of the existing large effective area non-zero dispersion shifted single-mode fiber is a two-wavelength window.
  • Some invented large effective area optical fibers can theoretically reach A eff ⁇ 2 at a wavelength of 1550 nm. Due to the large mode field diameter, the loss when connected to standard optical fibers is too large to be practical.
  • the purpose of the present invention is to overcome the shortcomings of poor dispersion stability and small working wavelength range of the existing non-zero dispersion-shifted single-mode fiber, and to overcome the insufficient effective area and large bending loss of the existing large-effective non-zero-dispersion-shifted single-mode fiber Shortcomings.
  • the invention provides a sub-full-wave zero-dispersion stable-shift single-mode optical fiber.
  • the optical fiber includes a core and a uniform cladding of pure SiO 2.
  • the core includes three layers: a circular central layer with an optical fiber axis as a circle center. A first annular layer covering the circular central layer and a second annular layer covering the first circular layer, the relative refractive index difference of the circular central layer is ⁇ .
  • the radius is a; the first The relative refractive index difference of the annular layer is ⁇ 1 in width ; the relative refractive index difference of the second annular layer is ⁇ 2 and the width is 3 ⁇ 4 ; the refractive index profile of the circular central layer is basically an ⁇ section, so The refractive index profiles of the first annular layer and the second annular layer are basically step-type profiles, wherein the relative refractive index difference ⁇ of the circular central layer.
  • the invention provides a large effective area sub-full-wave zero dispersion stable displacement single-mode fiber, which has an effective area A eff 85 m 2 at a wavelength of 1390 nm, and a bending loss loss factor a m 0.06% - ⁇ 1 , the mode Field diameter MFD II 8. 0-11. 0 ⁇ .
  • the invention also provides a dispersion-stabilized low-dispersion slope sub-full-wave optical fiber.
  • the optical fiber includes a core and a pure SiO 2 uniform cladding.
  • the core includes three layers: a circular center with an optical fiber axis as a circle center. Layering, a first annular layer covering the circular central layer, and a second annular layer covering the first circular layer, the relative refractive index difference of the circular central layer Is ⁇ .
  • the radius is a; the refractive index of the first annular layer is substantially constant and is the same as the refractive index of the uniform cladding layer, and the width is H 1; the relative refractive index difference of the second annular layer is ⁇ 2 , the width Is ⁇ 2; wherein the relative refractive index difference A Q of the circular central layer is larger than the relative refractive index difference ⁇ 2 of the second annular layer ; the refractive index profile of the circular central layer is basically quasi-Bezier
  • the sub-full-wave zero-dispersion stable-shift single-mode fiber according to the present invention can satisfy the work by placing the zero-dispersion wavelength in the middle portion of the attenuation water peak wavelength region, placing the dispersion slope in the dispersion-stabilizing region, and selecting an appropriate ⁇ . Wide wavelength range, good dispersion stability, large effective area and / or small bending loss are required. Therefore, the sub-full-wave zero-dispersion stable-shift single-mode optical fiber of the present invention is significantly superior to the existing non-zero-dispersion shift single-core large-area non-zero dispersion-shift single-core fiber with a three-layer core and a circular central layer with a refractive index profile. Mode fiber.
  • the inventor named the invented optical fiber a dispersion-stabilized low-dispersion slope sub-full-wave fiber, which revealed that the zero-color The dispersion wavelength is placed in the middle of the wavelength range of the attenuation water peak, but the inventor did not explicitly put forward the concept of a zero dispersion stable displacement single-mode fiber at the time.
  • the dispersion-stabilized low-dispersion slope sub-full-wave fiber in the earlier application and the zero-dispersion stable displacement single-mode fiber in the subsequent application have the same specific technical characteristics.
  • Figure 1 is a refractive index profile of the invented sub-full-wave zero-dispersion stable-shift single-mode fiber.
  • Fig. 2 is a refractive index profile view of the invented dispersion-stable low dispersion slope sub-full-wave fiber. detailed description
  • the inventor's research on the fiber core system including three layered fiber found that:
  • the effective area-bending loss factor product is related to the alpha value of the circular central layered refractive index profile shape and the zero dispersion slope. Under the condition that the product is constant, adjusting the relative refractive index difference width of the first annular layer and the relative refractive index difference ⁇ 2 and width of the second annular layer can obtain the required effective area and corresponding Bending loss factor.
  • the zero dispersion wavelength is used as the design basis.
  • Optimizing the zero-dispersion wavelength, merging the zero-dispersion wavelength region and the attenuation water peak wavelength region with each other can improve the utilization rate of the optical fiber wavelength resource, and the absolute value of the dispersion outside the attenuation water peak wavelength region is greater than a given value, which can avoid nonlinear distortion.
  • the zero-dispersion wavelength is located in a wavelength range of 1390 ⁇ 5 nm.
  • the dispersion slope satisfies S A SS R , and the optical fiber is in a dispersion stable state.
  • S. 0.076 ⁇ 0.088ps / nm 2 -km.
  • ——Preferred zero dispersion slope that is, the dispersion slope that satisfies SA A SS R in the zero dispersion wavelength region is selected, so that the optical fiber is in a dispersion stable state.
  • the product of the bending loss factor of the effective area is basically determined.
  • the relative refractive index difference width By describing the relative refractive index difference ⁇ 2 and the width of the second annular layer, a desired effective area and a corresponding bending loss factor can be obtained.
  • the present invention adopts a fiber core structure including three layered optical fibers.
  • the refractive index profile of the fiber is shown in Figures 1 and 2.
  • FIG. 1 is a refractive index profile view of the invented sub-full-wave zero-dispersion stable-shift single-mode fiber, where 1, 2, 3, and 4 respectively represent the circular central portion of the invented sub-full-wave zero-dispersion stable-shift single-mode fiber Layer, first annular layer, second annular layer, and pure SiO 2 uniform cladding.
  • 5, 6 and 7 show a circular central hierarchical radius a, a first annular segment and a second annular segment width width H 2.
  • n Q , ⁇ and n 2 represent the maximum refractive indices of the circular central layer, the first annular layer and the second annular layer, respectively, and n d is the refractive index of pure Si0 2 uniform cladding.
  • the circular central layer uses a ct refractive index profile, and the range of cx varies widely, from about 1 to about 100, that is, from about a triangular profile to an approximately step profile, and the figure shows the ideal refractive index. In the cross section, there is not drawn a small central depression near the fiber axis.
  • FIG. 2 is a refractive index profile view of the invented dispersion-stable low-dispersion slope sub-full-wave fiber, where 11, 12, 13, and 14 respectively represent the circular central layer, the first annular layer, and the first layer of the invented fiber.
  • Two annular layers and pure SiO ⁇ uniform cladding. 15, 16 and 17 denote a circular central hierarchical radius a, the width of the first annular segment and a second annular segment 1 ⁇ width H 2.
  • n Q and n 2 represent the maximum refractive index of the circular central layer and the second annular layer, respectively, and are pure SiO 2 uniform cladding refractive indexes
  • 18 is a small central depression near the axis.
  • the circular central layer uses a quasi-Bezier function refractive index profile with a platform to draw a small central depression near the axis of the optical fiber.
  • optical fiber structure parameters can be calculated through their own customary methods without creative labor.
  • the following are examples of the basic methods and steps adopted by the inventors of the present invention when calculating the optical fiber structure parameters of the present invention:
  • the characteristic parameters of a sub-full-wave zero-dispersion stable-shift single-mode fiber according to the present invention are: zero-dispersion wavelength ⁇ .
  • a set of example structural parameters that can implement the characteristic parameters are: ⁇ -refractive index profile of the core circular layer of the core takes ⁇ ⁇ 0.7, ⁇ .
  • Table 1 shows the characteristics of a preferred embodiment of a single-mode fiber with a large effective area sub-full wave and zero dispersion stable displacement in accordance with the present invention:
  • Table 2 gives a set of example structural parameters that can achieve the large effective area sub-full wave zero dispersion stable displacement single-mode fiber shown in Table 1:
  • Table 3 shows the characteristics of a preferred embodiment of a submode full-wave zero dispersion stable displacement single-mode fiber with small bending loss according to the present invention:
  • Table 4 shows a set of example structural parameters that can achieve the small bending loss sub-full-wave zero dispersion stable displacement single-mode fiber shown in Table 3:
  • Table 5 shows the characteristics of a preferred embodiment of the dispersion-stabilized low-dispersion slope sub-full-wave fiber in accordance with the present invention:
  • Table 6 shows a set of example structural parameters that can achieve the dispersion stable low dispersion slope sub-full-wave fiber shown in Table 5:
  • the refractive index profile of the circular central layer is either basically an ⁇ profile or a substantially quasi-Bezier function refractive index profile, and includes light having a shape similar to that of the a-section or the quasi-Bezier function profile. Other refractive index profiles with similar transmission properties.
  • the refractive index profile of an optical fiber can actually consist of multiple layers of deposition; the number of layers varies depending on the manufacturing method, ranging from a few layers to as many as several hundred layers.
  • the circular refractive index profile of the smooth layer can be regarded as the limit case of the infinite multilayer trapezoidal profile.
  • the refractive index profile of the optical fiber will have a small central depression near the axis.
  • a small central depression will not seriously affect the basic performance of the optical fiber.
  • the depth of the central depression and the radius of the bottom surface of the inverted cone are small, the influence may not be counted, and it may be regarded as the limit situation. There is no central depression.
  • the data listed in the table correspond to the following conditions:
  • the circular central layer has a smooth refractive index profile and no central depression.
  • the relevant data is slightly different from the corresponding data in the table.
  • the sub-full-wave zero-dispersion stable-shift single-mode fiber according to the present invention has the advantages of high wavelength resource utilization and good dispersion stability of the zero-dispersion stable-shift single-mode fiber according to the principle discovered by the inventor, and is effective from a larger scale.
  • the product of area-bending loss factor makes the effective area large and the bending loss small.
  • the dispersion-stabilized low-dispersion slope sub-full-wave fiber according to the present invention has lower dispersion stability, but has a wider operating wavelength range. Big.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne une fibre optique monomodale à dispersion nulle et décalage stable pour sous-onde intégrale, comprenant un coeur ainsi qu'une gaine uniforme, ledit coeur comportant trois couches : une couche circulaire centrale, la première couche d'enveloppe appliquée sur ladite couche circulaire centrale et la seconde couche d'enveloppe appliquée sur ladite première couche d'enveloppe. Ladite fibre est caractérisée en ce que la différence d'indice relatif Δ0 de ladite couche circulaire centrale est supérieure à la différence d'indice relatif Δ2 de la seconde couche d'enveloppe, et la longueur d'onde μ0 à une dispersion nulle se trouve dans la partie moyenne de la région de longueur d'onde de crête d'atténuation, la pente à dispersion nulle S0=0,076~0,088ps/nm2-km. La présente invention concerne également une fibre optique monomodale à dispersion nulle et décalage stable pour la sous-onde intégrale présentant une section efficace croissante, et une fibre présentant une faible perte de courbe.
PCT/CN2003/000637 2002-08-07 2003-08-07 Fibre optique monomodale a dispersion nulle et decalage stable pour sous-onde integrale WO2004015467A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003255096A AU2003255096A1 (en) 2002-08-07 2003-08-07 Zero dispersion stable shift single mode optical fiber for the sub-whole band

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CNA021364125A CN1474203A (zh) 2002-08-07 2002-08-07 色散稳定型低色散斜率亚全波光纤
CN02136412.5 2002-08-07
CN 03141502 CN1567005A (zh) 2003-07-09 2003-07-09 亚全波零色散稳定位移单模光纤
CN03141502.4 2003-07-09

Publications (1)

Publication Number Publication Date
WO2004015467A1 true WO2004015467A1 (fr) 2004-02-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600800A1 (fr) * 2004-05-28 2005-11-30 Samsung Electronics Co., Ltd. Fibre à dispersion décalée pour réseau métropolitain

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1351268A (zh) * 2000-10-31 2002-05-29 住友电气工业株式会社 光纤
US6424776B1 (en) * 1998-09-17 2002-07-23 Alcatel Monomode optical fiber with optimized dispersion shift for high speeds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6424776B1 (en) * 1998-09-17 2002-07-23 Alcatel Monomode optical fiber with optimized dispersion shift for high speeds
CN1351268A (zh) * 2000-10-31 2002-05-29 住友电气工业株式会社 光纤

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600800A1 (fr) * 2004-05-28 2005-11-30 Samsung Electronics Co., Ltd. Fibre à dispersion décalée pour réseau métropolitain
US7305165B2 (en) 2004-05-28 2007-12-04 Samsung Electronics Co., Ltd. Optical fiber for metro network

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