EP1046069A1 - Optischer faser mit optimalem verhältnis zwischen effektiven flächen und dispersionsgradienten für faseroptische wellenlängemultiplexübertragungssystemen - Google Patents

Optischer faser mit optimalem verhältnis zwischen effektiven flächen und dispersionsgradienten für faseroptische wellenlängemultiplexübertragungssystemen

Info

Publication number
EP1046069A1
EP1046069A1 EP99942999A EP99942999A EP1046069A1 EP 1046069 A1 EP1046069 A1 EP 1046069A1 EP 99942999 A EP99942999 A EP 99942999A EP 99942999 A EP99942999 A EP 99942999A EP 1046069 A1 EP1046069 A1 EP 1046069A1
Authority
EP
European Patent Office
Prior art keywords
fiber
fiber according
index
ring
radius
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP99942999A
Other languages
English (en)
French (fr)
Inventor
Louis-Anne De Montmorillon
Pascale Nouchi
Jean-Claude Rousseau
Rapha[Lle Sauvageon
Jean-François Chariot
Alain Bertaina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draka Comteq BV
Original Assignee
Alcatel CIT SA
Alcatel SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26234549&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1046069(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from FR9811644A external-priority patent/FR2783609B1/fr
Priority claimed from FR9902028A external-priority patent/FR2790107B1/fr
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP1046069A1 publication Critical patent/EP1046069A1/de
Ceased legal-status Critical Current

Links

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
    • G02B6/036—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
    • G02B6/02004—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
    • G02B6/02014—Effective area greater than 60 square microns in the C band, i.e. 1530-1565 nm
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02266—Positive dispersion fibres at 1550 nm
    • G02B6/02271—Non-zero dispersion shifted fibres, i.e. having a small positive dispersion at 1550 nm, e.g. ITU-T G.655 dispersion between 1.0 to 10 ps/nm.km for avoiding nonlinear effects
    • 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
    • G02B6/0228—Characterised by the wavelength dispersion slope properties around 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
    • G02B6/028—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
    • 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
    • G02B6/03622—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 2 layers only
    • G02B6/03627—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 2 layers only arranged - +

Definitions

  • the present invention relates to the field of transmissions by optical fiber, and more particularly to the field of transmissions by multiplexing wavelengths with offset dispersion line fiber.
  • the index profile is generally qualified as a function of the shape of the graph of the function which associates the refractive index with the radius of the fiber.
  • the distance r to the center of the fiber is represented conventionally on the abscissa, and on the ordinate the difference between the refractive index and the refractive index of the fiber cladding.
  • the fiber To use a fiber in a transmission system, and in particular in a transmission system with wavelength multiplexing, it is advantageous for the fiber to have a large effective area in the wavelength range of the multiplex.
  • a large effective surface makes it possible to limit the power density in the fiber, at constant total power, and to limit or avoid undesirable non-linear effects.
  • the fiber provides single-mode propagation of the multiplex channels.
  • ITU-T G 650 gives a definition of the cable cut wavelength.
  • the theoretical fiber cut-off wavelength is generally several hundred nanometers longer than the cable cut wavelength. It appears in fact that the propagation in an optical fiber can be monomode, even if the theoretical cut-off wavelength is greater than the wavelength of the signals used: in fact, beyond a distance of a few meters or tens of meters, which is small compared to the propagation distances in fiber optic transmission systems, the secondary modes disappear due to too much attenuation. Propagation in the transmission system is then single mode. It is also important that the fiber has as low a sensitivity as possible to bends and microbends.
  • the sensitivity to bending is evaluated as explained in recommendation ITU-T G.650, by measuring the attenuation caused by the winding of 100 turns of a fiber around a coil of radius 30 mm.
  • the sensitivity to microbends is measured in a manner known per se; as in the following, it can be measured in relation to a fiber such as the fiber marketed by the applicant under the reference ASMF 200.
  • DSF offset dispersion shifted fibers
  • NZ-DSF (acronym for "non-zero dispersion shifted fibers") is termed fibers with offset dispersion, having a non-zero chromatic dispersion for the wavelengths at which they are used.
  • the non-zero value of the chromatic dispersion makes it possible to limit the non-linear effects in the fiber, and in particular the four-wave mixing between the channels of the multiplex.
  • EP-A-0 859 247 describes DSF fibers with a ring profile, and explains that there exists for such fibers a range in which the effective surface and the chromatic dispersion slope have different directions of variation.
  • the fibers given by way of example have a negative dispersion slope between -4.5 and - 1.0 ps / (nm.km). They have a cutoff wavelength greater than 1,500 nm, for a fiber length of 2 m.
  • Lucent offers under the name TrueWave / RS a fiber having the following characteristics: wavelength ⁇ o: 1468 nm; chromatic dispersion slope at 1550 nm: 0.045 ps / (nm 2 .km); chromatic dispersion at 1,550 nm: 3.7 ps / (nm.km); mode diameter at 1,550 nm: 8.4 ⁇ m; effective surface at 1,550 nm: 55 ⁇ m 2 .
  • Corning sells NZ-DSF fibers under the LEAF brand with an effective area of 72 ⁇ m 2 at 1550 nm, a chromatic dispersion slope of the order of 0.08 to 0.09 ps / (nm 2 .km) ; the chromatic dispersion is canceled out at approximately 1500 nm.
  • the invention proposes an optical fiber capable of being put in cable, and which presents an advantageous compromise between the effective surface and the chromatic dispersion slope, in particular due to the choice of the cut-off wavelength. More specifically, the invention proposes a single-mode optical fiber in cable, having, for a wavelength of 1,550 nm:
  • the fiber according to the invention has a chromatic dispersion at 1550 nm between 5 and 1 1 ps / (nm.km), and / or a dispersion slope less than 0.07 ps / (nm 2 .km).
  • the ratio between the effective surface and the chromatic dispersion slope preferably remains less than 5000 ⁇ m .nm 2 . km / ps.
  • the effective surface of the fiber is greater than or equal to 70 ⁇ m 2 .
  • the fiber exhibits bending losses at 1550 nm less than or equal to 0.05 dB for 100 turns of fiber around a radius of 30 mm and preferably less than or equal to 0.005 dB. It can also have a sensitivity to microbends less than 1, 2 and preferably less than 0.8.
  • the fiber has a theoretical cut-off wavelength greater than 1,550 nm., And a cable cut-off wavelength less than 1,300 nm.
  • the fiber has an attenuation at 1550 nm less than or equal to 0.23 dB / km, and a modal dispersion of polarization less than or equal to 0.08 ps.km " '.
  • the fiber has a trapezoid index profile with ring.
  • the difference between the index of the central part of the fiber and the index of the cladding is advantageously between 6.1 0 '3 and 9.1 0 "3
  • the difference between the index of the ring and the index of the sheath is between 2.1 0 " 3 and 5.10 " 3 .
  • the fiber is such that the ratio between the radius of the trapezoid and the outside radius of the ring is between 0.42 and 0.58.
  • the ratio between the inside radius of the ring and the outside radius of the ring is advantageously between 0.68 and 0.85. It is also advantageous for the outside radius of the ring to be between 8 and 1 0.5 ⁇ m.
  • the fiber has a profile of coaxial index with ring.
  • the fiber advantageously has one or more of the following characteristics: - difference between the index of the ring and the index of the cladding between 0.5.10 "3 and 5.10 "3 ; ratio between the inner radius of the ring and the outer radius of the ring between 0.65 and 0.85; outer radius of the ring between 7.5 and 11.5 ⁇ m.
  • the fiber can finally have a coaxial index profile with a buried external part. In this case, it is advantageous for the outside radius of the outer sheath to be between 7.5 and 9 ⁇ m.
  • the fiber advantageously has one or more of the following characteristics: - difference between the maximum index of the coaxial part of the fiber and the index of the cladding between 7.2.10 3 and 1 0.5.1 0 "3 ; difference between the index of the inner sheath and the index of the sheath between -6.7.10 " 3 and -4, 1.10 "3 ; ratio between the radius of the central part and the radius of the coaxial part between 0.35 and 0.55.
  • the invention further provides a fiber optic transmission system with wavelength multiplexing, comprising such a fiber as line fiber. It is then possible to additionally provide dispersion compensation fiber.
  • FIG. 1 a schematic representation of the trapezoid index profile with ring of a fiber according to a first embodiment of the invention
  • FIG. 2 a schematic representation of the profile of coaxial index with ring of a fiber according to a second embodiment of the invention
  • Figure 3 a schematic representation of the coaxial index profile with buried sheath of a fiber according to a third embodiment of the invention.
  • the invention proposes a fiber which presents an advantageous compromise between the effective surface and the chromatic dispersion slope, which makes it possible to limit the power density in the fiber, without however inducing distortions between the channels of a multiplex.
  • the fiber also has low losses by bending and by micro-bending, which makes it possible to place it in a cable; it ensures single-mode propagation when it is thus placed in a cable.
  • the possible characteristics of the fiber of the invention are therefore the following: effective area greater than or equal to 60 ⁇ m 2 , or even preferably greater than 70 ⁇ m 2 ; chromatic dispersion at 1,550 nm between 3 and 14 ps / (nm.km), and preferably between 5 and 11 1 ps / (nm.km); chromatic dispersion slope at 1,550 nm positive and less than 0.1 ps / (nm 2 .km), preferably less than or equal to 0.07 ps / (nm 2 .km); ratio between the effective surface and the chromatic dispersion slope greater than 1000 ⁇ m 2 .nm 2 .
  • the fiber can also have an attenuation at 1550 nm which is less than 0.23 dB / km, as well as a polarization modal dispersion less than or equal to 0.08 ps / km 0 ' 5 .
  • the radii are given in micrometers and measured relative to the axis of the fiber.
  • the indices are measured by the difference with the index of the fiber cladding.
  • FIG. 1 shows a schematic representation of a trapezoid index profile with ring, which is used in a first embodiment of the invention, for different fibers.
  • the profile presents, starting from the center of the fiber: a central part of radius r, with an index ⁇ n, substantially constant and greater than the index of the cladding; - A first annular part surrounding this central part, up to a radius r 2 , and in which the index decreases in a substantially linear manner as a function of the radius; these first two parts have the shape of a trapezoid; a second annular part, of index ⁇ n 3 substantially constant and less than or equal to the index of the sheath, and which extends to a radius r 3 ; this part is commonly referred to as an inner sheath; a third annular part of index ⁇ n 4 substantially constant and greater than the index of the sheath, which extends to a radius r 4 ; this part is called ring.
  • the fiber sheath extends around the ring
  • Table 1 gives possible radius and index values for fibers with a trapezoidal profile with ring. The rays are given in micrometers. Table 1
  • the difference ⁇ n between the index of the central part of the fiber and the index of the cladding can be between 6.1 0 "3 and 9.10 " 3 .
  • the difference ⁇ n 4 between the index of the ring and the index of the cladding is between
  • the ratio r / r 4 is between 0.42 and 0.58, while the ratio r 3 / r 4 is between 0.68 and 0.85.
  • the radius r 4 of the ring can be between 8 and 10.5 ⁇ m.
  • the fibers obtained for these radius and index values have the characteristics given in the corresponding lines of Table 2.
  • the units are as follows: theoretical cut-off wavelength ⁇ ⁇ : nm wavelength of cancellation of the chromatic dispersion ⁇ 0 : nm chromatic dispersion slope C: ps / (nm 2 .km) - effective area S ⁇ ff : ⁇ m 2 chromatic dispersion C: ps / (nm.km) bending losses PC: dB Bending losses are measured as indicated above by winding 100 turns of the fiber around a radius of 30 mm, and by measuring the induced losses.
  • the micro- bend losses S ⁇ c are measured with respect to the ASMF 200 fiber sold by the applicant, and are dimensionless.
  • the ratio S eff / C presents the dimension ⁇ m 2 .nm 2 . km / ps. Table 2
  • Figure 2 shows a schematic representation of a coaxial profile with ring, which is used in a second embodiment of the invention, for different fibers.
  • the profile starting from the center of the fiber: a central part of radius r, with an index ⁇ ⁇ substantially constant and less than or equal to the index of the cladding; a first annular part, surrounding this central part up to a radius r 2 , with an index ⁇ n 2 substantially constant and greater than the index of the central part; all of these first two parts forming a coaxial profile; a second annular part of index ⁇ n 3 substantially constant and which extends to a radius r 3 ; this part is called the inner sheath; - A third annular part of index ⁇ n 4 substantially constant and greater than the index of the sheath, which extends to a radius r 4 ; this part is called a ring.
  • the fiber sheath extends around the ring.
  • Table 3 again gives possible values of radii and index for fibers having the coaxial profile with ring of FIG. 2; as above, the radii are given in micrometers.
  • the difference ⁇ n 4 between the index of the ring and the index of the cladding is between 0.5.1 0 '3 and 5.1 0 "3.
  • the difference between the maximum index of the coaxial part and the index of the cladding is between 7.2.10 "3 10.5.10 " 3.
  • the difference in index ⁇ n 3 is between - 6.7.10 "3 and -4, 1.10 '3 .
  • the ratio r, / r 2 is between 0.35 and 0.55
  • the ratio r 3 / r 4 is between 0.42 and 0.58
  • the ratio r 3 / r 4 is between 0.65 and 0.85.
  • the radius r 4 of the ring can be between 7.5 and 11.5 ⁇ m.
  • Figure 3 shows a schematic representation of a coaxial profile with buried sheath, which is used in a third embodiment of the invention, for different fibers.
  • the profile has, as in the profile of Figure 2, a heart with a coaxial profile. However, it does not have a ring, and the inner sheath has an index strictly lower than that of the sheath.
  • the difference between the maximum index of the coaxial part and the index of the cladding is between 7.2.1 0 "3 10.5.1 0 " 3 .
  • the difference in index ⁇ n 3 is between -6.7.10 "3 and -4.1 .10 " 3 .
  • the ratio / r 2 is between 0.35 and 0.55, and the radius r 3 is between 7.2 and 10.5 ⁇ m.
  • the fibers obtained for these radius and index values have the characteristics given in table 6, with the same units as above.
  • the invention can be manufactured by a person skilled in the art using known techniques, such as MCVD or the other techniques commonly used for the manufacture of optical fibers.
  • the fiber of the invention can advantageously be used as line fiber in transmission systems, and in particular in transmission systems with wavelength multiplexing.
  • Dispersion compensation fiber arranged at regular intervals in the system, can also be provided in a system using such a line fiber, to limit variations in the dispersion.
  • the present invention is not limited to the examples and embodiments described and shown, but it is susceptible of numerous variants accessible to those skilled in the art.

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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)
EP99942999A 1998-09-17 1999-09-17 Optischer faser mit optimalem verhältnis zwischen effektiven flächen und dispersionsgradienten für faseroptische wellenlängemultiplexübertragungssystemen Ceased EP1046069A1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9811644 1998-09-17
FR9811644A FR2783609B1 (fr) 1998-09-17 1998-09-17 Fibre optique monomode optimisee pour les hauts debits
FR9902028A FR2790107B1 (fr) 1999-02-18 1999-02-18 Fibre de ligne pour systemes de transmission a fibre optique a multiplexage en longueurs d'onde
FR9902028 1999-02-18
PCT/FR1999/002220 WO2000017681A1 (fr) 1998-09-17 1999-09-17 Fibre optique a rapport optimise entre l'aire effective et la pente de dispersion pour systemes de transmission a fibre optique a multiplexage en longueurs d'onde

Publications (1)

Publication Number Publication Date
EP1046069A1 true EP1046069A1 (de) 2000-10-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99942999A Ceased EP1046069A1 (de) 1998-09-17 1999-09-17 Optischer faser mit optimalem verhältnis zwischen effektiven flächen und dispersionsgradienten für faseroptische wellenlängemultiplexübertragungssystemen

Country Status (4)

Country Link
US (1) US6535676B1 (de)
EP (1) EP1046069A1 (de)
JP (1) JP4499288B2 (de)
WO (1) WO2000017681A1 (de)

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US6535676B1 (en) 2003-03-18
JP2002525671A (ja) 2002-08-13
JP4499288B2 (ja) 2010-07-07

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