WO2016114514A1 - Fibre optique en ruban comprenant des fibres optiques compactes à mode unique - Google Patents

Fibre optique en ruban comprenant des fibres optiques compactes à mode unique Download PDF

Info

Publication number
WO2016114514A1
WO2016114514A1 PCT/KR2015/014476 KR2015014476W WO2016114514A1 WO 2016114514 A1 WO2016114514 A1 WO 2016114514A1 KR 2015014476 W KR2015014476 W KR 2015014476W WO 2016114514 A1 WO2016114514 A1 WO 2016114514A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
optical
ribbon
cladding
mode
Prior art date
Application number
PCT/KR2015/014476
Other languages
English (en)
Korean (ko)
Inventor
정윤철
장준호
김훈
오치환
정창현
조형수
Original Assignee
한국과학기술원
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
Priority claimed from KR1020150187846A external-priority patent/KR101788628B1/ko
Application filed by 한국과학기술원 filed Critical 한국과학기술원
Publication of WO2016114514A1 publication Critical patent/WO2016114514A1/fr

Links

Images

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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables

Definitions

  • the present invention relates to a method for increasing transmission capacity per unit area, and more particularly, to a miniaturized single mode optical fiber and a ribbon optical fiber design for optical communication.
  • the transmission capacity to be handled in the optical communication network is greatly increased.
  • the amount of information that needs to be processed in data centers is increasing, it is expected that the use of additional fibers in the near future will soon be required.
  • installing new fiber and installing related equipment in a limited space such as a data center can be difficult in terms of space utilization and cost. Therefore, technologies for maximizing transmission capacity while using minimal space have been attracting attention.
  • the spatial multiplexing technique based on multicore optical fibers or multimode optical fibers can significantly increase the transmission capacity per unit area.
  • the transmission capacity of the optical fiber can be increased in proportion to the number of cores.
  • new connectors, amplifiers, and splitters, which are suitable for multicore optical fibers are required to be used. Therefore, it is expected to be difficult to apply to a real system.
  • the multimode optical fiber has an advantage of increasing the transmission capacity in proportion to the number of modes by using the orthogonality of each mode.
  • various new components and elements are required and the complexity of the transmitting and receiving end is required. Has the disadvantage of greatly increasing. In order to overcome these shortcomings and to be used in actual systems, it is necessary to improve the maturity of the industry, and it is expected to take considerable time in the future.
  • miniaturizing a single mode optical fiber which is currently widely used, has been proposed. Since it has a similar shape and characteristics to the existing single-mode fiber, the manufacturing method is simple, and the structure and various parts and elements of the system that are already installed can be utilized as it is. Of course, new types of devices such as optical connectors may be required for compatibility with existing optical fibers, but the complexity is relatively insignificant compared to the method using a multicore optical fiber or a multimode optical fiber. Therefore, miniaturized single-mode fiber can be an excellent alternative for building a space-efficient system in the near future before multicore fiber or multimode fiber can be utilized.
  • This method has less space efficiency gain than the method using multi-core fiber or multi-mode fiber, but the manufacturing method is relatively simple and the structure, various parts and elements of the system already installed can be used as it is. Can be.
  • the miniaturized single-mode fiber is used in the form of a ribbon, it is expected that the space efficiency can be significantly increased compared to the use of multiple strands of the conventional fiber.
  • Ribbon optical fiber refers to a form in which several optical fibers are arranged in parallel and grouped together using a matrix material.
  • Various optical cables used today have many forms in which the optical fiber in the form of a ribbon is closely arranged, and has the advantage of being high in space efficiency and easy to handle at the same time.
  • multiple fibers included in the ribbon fiber can be cut and connected at one time for convenient maintenance.
  • each of the fibers constituting the ribbon fiber must be significantly smaller than the conventional single mode fiber.
  • Existing optical fiber has a diameter of 125 ⁇ m of the cladding and 250 ⁇ m of the diameter including the coating, and thus it is necessary to reduce the thickness of the cladding or coating to manufacture a miniaturized optical fiber. For example, if the diameter of the optical fiber including the coating is reduced to 200 ⁇ m, a space efficiency increase of 36% may be obtained.
  • each fiber constituting the ribbon should have similar optical transmission characteristics as the conventional single mode fiber. Light transmission characteristics include light loss, mode field diameter (MFD), cutoff wavelength, refractive loss characteristics, and the like.
  • the design of the optical fiber and ribbon having the minimum cross-sectional area is required based on the analysis.
  • the present invention has been proposed to solve the above-mentioned conventional problems, and the object of the optical fiber ribbon optical fiber composed of a miniaturized single-mode optical fiber according to the present invention, compared to the conventional single-mode optical fiber, the transmission quality of the optical signal, mechanical
  • the present invention provides a means for maximizing transmission capacity per unit area without significantly different reliability and splicing characteristics.
  • each optical fiber has a refractive index of the core n 1 and a refractive index of n it includes 2 naegwak cladding, and a refractive index n 3 of the outer cladding,
  • the diameter d 2 of the inner cladding of each optical fiber is 40 ⁇ m to 50 ⁇ m
  • ⁇ 2 / ⁇ 1 The value of ⁇ 2 / ⁇ 1 is greater than 0 and less than 0.7
  • the diameter of each optical fiber including the cladding is 85 ⁇ m or less
  • ⁇ 1 (n 1 -n 3 ) / n 3 as a difference in refractive index between the core and the outer cladding
  • ⁇ 2 is a difference in refractive index between the inner cladding and the outer cladding
  • ⁇ 2 (n 2 -n 3 ) / n 3 .
  • each optical fiber is covered with one or more layers of coating, the number of optical fibers included in the ribbon optical fiber is N, the diameter of each optical fiber When referred to as d ⁇ m, the size of the ribbon optical fiber may not exceed (d ⁇ N + 60) ⁇ (N + 60) ⁇ m 2 .
  • the core diameter (d 1 ) of each optical fiber is 8 ⁇ m to 10 ⁇ m, and the refractive index difference ⁇ 1 between the core and the outer cladding may be 0.35% to 0.41%.
  • each optical fiber is covered with one or more coatings, the total diameter of each optical fiber including the coating may be 190 ⁇ m or less.
  • each optical fiber has a value of less than 0.4 dB / km in the wavelength band of 1310 nm, in the wavelength band of 1550 nm It may have a value less than 0.35 dB / km.
  • the mode field diameter of each optical fiber may be 8.6 ⁇ m to 9.5 ⁇ m in the wavelength band of 1310 nm.
  • the cable blocking wavelength of each optical fiber may have a value of 1300 nm or less.
  • the tensile strength of each optical fiber may have a value of at least 0.69 GPa.
  • each optical fiber the optical loss of 0.5 dB or less in the 1625 nm wavelength band when rotated 100 times in a state of bending radius 37.5 mm Can have
  • each optical fiber has a color dispersion of 20 ps / nm / km or less in the wavelength band of 1550 nm, 0.07 ps / nm 2 / It may have a change rate of chromatic dispersion according to the wavelength of less than km.
  • the optical fiber ribbon optical fiber composed of a miniaturized single-mode optical fiber according to the present invention is an optical fiber suitable for large-capacity optical transmission, and in particular, it is possible to provide an effective transmission capacity increasing method by maximizing the transmission capacity per unit area. have. In addition, it can relieve the burden of freeing up space in costly data centers.
  • 1 is a graph showing the change in bending loss with cladding thickness of single-mode fiber and the requirements of ITU-T G.652.
  • FIG. 2 is a structural diagram illustrating a structure of an optical fiber having a depressed cladding index profile according to an embodiment of the present invention.
  • 3 (a) and 3 (b) are graphs showing changes in bending loss and cable cutoff wavelength of an optical fiber according to an inner cladding diameter
  • FIG. 5 is a graph showing the change in minimum cladding thickness required to satisfy the bending loss conditions specified in ITU-T G.652, according to the structure of the optical fiber.
  • FIG. 6 is a graph showing the optical fiber structure required to satisfy the mode field diameter condition specified in ITU-T G.652.
  • Figure 7 is a schematic view showing the structure and design of the optical fiber ribbon optical fiber consisting of a miniaturized optical fiber according to an embodiment of the present invention.
  • miniaturized single-mode optical fiber suitable for optical communication must have optical transmission characteristics similar to the conventional single-mode optical fiber to be practical.
  • the size of the conventional single mode optical fiber has a cladding diameter of 125 ⁇ m and a coating diameter of 250 ⁇ m.
  • Various requirements have been established for single-mode fiber, and the standards for the most commonly used fiber optics for communications are specified in ITU-T G.652.
  • the main items of the above standards are optical loss, mode field diameter, cable cut-off wavelength, bending loss, and tensile strength. Satisfying these conditions is the most important part of fiber design.
  • a method for reducing the cross-sectional area of the optical fiber is a method for reducing the thickness of the cladding and coating.
  • the refractive index of the cladding is designed to be lower than the refractive index of the core, allowing light to travel through the core.
  • the progress of light intensity does not only exist in the core but also in the cladding, so as the thickness of the cladding decreases, the probability of exiting the cladding increases. That is, this may increase the light loss.
  • the optical fiber is bent, the distribution of light is directed to the outside of the optical fiber, so the thinner the cladding, the more susceptible it is to light loss due to the bending. FIG.
  • ⁇ (n 1 -n 2) / n 2.
  • a method for suppressing the bending loss of the optical fiber is to increase the difference between the refractive index of the core and the refractive index of the cladding. If the core-cladding refractive index difference is ⁇ , the larger the ⁇ , the more the light propagating through the optical fiber is toward the core, so that the light does not escape to the outside of the cladding. However, if ⁇ is increased, the mode field diameter is greatly reduced.
  • the mode field diameter represents the extent to which light propagates through an optical fiber, and the ITU-T G.652 standards specify that it should have a value of 8.6 to 9.5 ⁇ m at a 1310 nm wavelength.
  • the mode field diameter is important because of its compatibility with existing optical fibers.
  • Equation 1 The splice loss occurring when two optical fibers having different mode field diameters are connected is represented by Equation 1 below.
  • W 1 and W 2 are the mode field diameters of the respective optical fibers, and d is the optical fiber connection offset.
  • connection loss occurs when the mode field diameter of each optical fiber is different, and as the difference increases, the connection loss increases. Since the optical transceivers and various optical devices currently used are connected to optical fibers having a mode field diameter of 8.6 to 9.5 ⁇ m at a wavelength of 1310 nm, miniaturized single mode optical fibers should be designed to have similar mode field diameters.
  • a depressed cladding index profile was used instead of a step index.
  • 2 shows the structure of a depressed cladding index profile.
  • the cladding is divided into an inner cladding (i) and an outer cladding (o), and a refractive index of the inner cladding (i) is lower than that of the outer cladding (o).
  • a lower bending loss can be obtained for the same mode field diameter as compared to the step index profile.
  • the cladding In the case of a typical step index profile, the cladding consists of pure silica and the core portion increases refractive index through germanium doping. However, due to the difference in doping, the hardness and other properties are different, and thus two materials having different properties are adjacent to each other and thus have properties that are vulnerable to external stress. However, if the outer cladding uses pure silica and the inner cladding is a small amount of doping such as fluorine, the above problems can be alleviated. In addition, since the doping concentration of the core can be relatively lower than that of the step index, it is advantageous to obtain low light loss.
  • n 3 ) / n 3 and ⁇ 2 (n 2 -n 3 ) / n 3 .
  • 3 (a) shows the bending loss of the optical fiber with respect to the inner cladding diameter d 2 .
  • d 1 , d 3, and ⁇ 1 + ⁇ 2 were set to 9 ⁇ m, 80 ⁇ m, and 0.44%, respectively, and the value of ⁇ 2 / ⁇ 1 was considered 0.1 or 0.7.
  • the bending radius was set to 17.5 mm, much smaller than the recommended 37.5 mm of ITU-T G.652.
  • the wavelength was assumed to be 1625 nm.
  • the bending loss decreases as d 2 increases, and when the value of ⁇ 2 / ⁇ 1 is 0.1, the bending loss of 0.001 dB / turn or less is obtained when d 2 is 40 ⁇ m or more. Can be.
  • the wavelength band to be used must be longer than the blocking wavelength of the optical fiber.
  • LP11 mode as well as LP01 mode exist, so the signal dispersion can seriously distort the signal. Therefore, when designing a miniaturized single-mode fiber, various design parameters should be determined so that the blocking wavelength is sufficiently low.
  • the cable cutoff wavelength is defined as the shortest wavelength at which LP11 mode losses of more than 19.3 dB occur when light is transmitted through a 22 m long fiber.
  • the 22 m long optical fiber consists of an optical fiber part wound twice in the state of bend radius 40 mm and the remaining optical fiber part wound in the state of bend radius 140 mm.
  • the cable blocking wavelength increases. This is because the wider the inner cladding region, the less leakage of higher-order modes such as LP11 mode is suppressed.
  • d 2 should be set to 50 ⁇ m or less in order to obtain a cable cutoff wavelength shorter than 1300 nm. In this embodiment, a low bending loss and a short cable cutoff wavelength are simultaneously obtained. D 2 was set to 45 ⁇ m.
  • d 1 and ⁇ 1 on the bending loss were examined for various d 3 .
  • 4 shows the minimum d 3 required to obtain a bending loss of 0.001 dB / turn or less.
  • the bend radius was set here to 17.5 mm, less than the recommended 37.5 mm of ITU-T G.652. This is to consider the effect of reducing the bending radius due to errors that may occur in the manufacturing and processing. It was found that the larger the d 1 and the larger the value of ⁇ 1 , the more satisfied the bending loss condition for the thinner cladding. 5 also shows the effect of d 1 and ⁇ 1 on the cable blocking wavelength.
  • the blocking wavelength increases, because higher light gathers toward the core, higher order modes such as LP11 mode can be guided at relatively higher wavelengths.
  • the blocking wavelength increases. Therefore, it is advantageous to design small values of d 1 and ⁇ 1 to obtain a short cutoff wavelength.
  • FIG. 6 shows values of d 1 and ⁇ 1 such that the mode field diameter is from 8.6 ⁇ m to 9.5 ⁇ m in the wavelength band of 1310 nm.
  • This range is the range of the mode field diameters of a typical single mode fiber, which improves the compatibility between the fibers.
  • the diameter (d 3 ) of the outer cladding can be made 80 ⁇ m or less
  • the cable cut-off wavelength is 1300 nm or less
  • d 1 which can satisfy the requirements of the mode field diameter simultaneously
  • ⁇ 1 values are present in the range of 8 ⁇ m ⁇ d 1 ⁇ 10 ⁇ m, 0.35% ⁇ d 1 ⁇ 0.41%.
  • the core has a diameter of about 9.0 ⁇ m and ⁇ 1 is about 0.4%, and the outer cladding diameter at this time may be reduced to 80 ⁇ m or less.
  • the mode field diameter (@ 1550 nm) of the optical fiber having this design value was 10.3 ⁇ m, which is almost similar to the mode field diameter of a general single mode optical fiber.
  • the coating consisted of dual-layer acrylate and had a refractive index of about 1.51 to 1.53, which is higher than the refractive index of the cladding.
  • the characteristics of the fabricated fiber and its comparison with the ITU-T G.652 standards are summarized in Table 1.
  • the macro bending loss is the value at the bending radius of 16 mm for the measurement and at the bending radius of 32.5 mm for the ITU-T G.652 standards. Even in more severe bending conditions, bending losses lower than 0.005 dB / turn, the tolerances specified in the ITU-T G.652 standards, were obtained. It can be seen that the size of the optical fiber is reduced by about 40% compared to a single mode optical fiber having a typical 250 ⁇ m coating diameter. At the same time, it was confirmed that all items except the cable cut-off wavelength met the ITU-T G.652 standards. Cable blocking wavelengths nevertheless have values less than 1300 nm, allowing broadband optical transmission.
  • a ribbon optical fiber By arranging the single-mode optical fibers with a smaller cross-sectional area in a row, a ribbon optical fiber can be usefully used for optical cables and various connectors.
  • Four, eight and twelve optical fiber-based ribbons are available.
  • 5 illustrates a design value of a ribbon optical fiber based on twelve optical fibers as an example.
  • the ribbon jacket for attaching each optical fiber was designed to have a thickness of about 25 ⁇ m. This is set in consideration of the situation that the optical fibers are not evenly arranged.
  • the size of the optical fiber ribbon fabricated in this form was measured to be 2320 ⁇ m in width and 240 ⁇ m in length, and the cross-sectional area was about 556,800 ⁇ m 2 .

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

Une fibre optique en ruban comprenant des fibres optiques compactes à mode unique, selon un mode de réalisation de la présente invention, est une fibre optique en ruban permettant d'augmenter une capacité de transmission par unité de surface. Chaque fibre optique qui constitue la fibre optique en ruban est considérablement compacte, par comparaison avec une fibre optique existante, de sorte que la surface de section transversale de cette dernière peut être réduite à environ 40 % ou plus de celle de la fibre optique existante, ce qui augmente la capacité de transmission d'un réseau de transmission optique tout en réduisant au minimum la fixation d'un espace supplémentaire qui est très coûteuse. Les fibres optiques ont une propriété de transmission optique, une fiabilité mécanique, et analogues, qui sont similaires à celles de la fibre optique existante, et peuvent être facilement reliées les unes aux autres, ce qui permet d'obtenir une excellente compatibilité. Bien qu'un profil d'indice de gaine enfoncée, qui est relativement facile à fabriquer, est utilisé, divers types de propriétés des fibres optiques sont appropriés pour un réseau de communication optique par l'intermédiaire de l'optimisation de chaque valeur numérique, et il est possible de maximiser l'effet d'une augmentation de capacité de transmission tout en utilisant divers types de dispositifs et éléments optiques, utilisés dans le réseau de communication optique existant, tels qu'ils sont.
PCT/KR2015/014476 2015-01-12 2015-12-30 Fibre optique en ruban comprenant des fibres optiques compactes à mode unique WO2016114514A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20150004304 2015-01-12
KR10-2015-0004304 2015-01-12
KR10-2015-0187846 2015-12-28
KR1020150187846A KR101788628B1 (ko) 2015-01-12 2015-12-28 소형화된 단일모드 광섬유로 구성된 리본 광섬유

Publications (1)

Publication Number Publication Date
WO2016114514A1 true WO2016114514A1 (fr) 2016-07-21

Family

ID=56406022

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2015/014476 WO2016114514A1 (fr) 2015-01-12 2015-12-30 Fibre optique en ruban comprenant des fibres optiques compactes à mode unique

Country Status (1)

Country Link
WO (1) WO2016114514A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110140070A (zh) * 2016-10-27 2019-08-16 康宁股份有限公司 低弯曲损耗单模光纤
CN113848608A (zh) * 2020-06-28 2021-12-28 中天科技精密材料有限公司 单模光纤及其制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000214342A (ja) * 1999-01-21 2000-08-04 Sumitomo Electric Ind Ltd プラスチッククラッド光ファイバおよびその製造方法
KR20010101304A (ko) * 1998-12-17 2001-11-14 오카야마 노리오 광섬유
KR20090116651A (ko) * 2008-05-06 2009-11-11 드라카 콤텍 비.브이. 벤드-인센서티브 싱글 모드 광파이버
US20120275751A1 (en) * 2011-04-27 2012-11-01 Draka Comteq B.V. High-Bandwidth, Radiation-Resistant Multimode Optical Fiber
KR101273759B1 (ko) * 2005-11-10 2013-06-12 드라카 콤텍 비.브이. 단일 모드 광섬유

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010101304A (ko) * 1998-12-17 2001-11-14 오카야마 노리오 광섬유
JP2000214342A (ja) * 1999-01-21 2000-08-04 Sumitomo Electric Ind Ltd プラスチッククラッド光ファイバおよびその製造方法
KR101273759B1 (ko) * 2005-11-10 2013-06-12 드라카 콤텍 비.브이. 단일 모드 광섬유
KR20090116651A (ko) * 2008-05-06 2009-11-11 드라카 콤텍 비.브이. 벤드-인센서티브 싱글 모드 광파이버
US20120275751A1 (en) * 2011-04-27 2012-11-01 Draka Comteq B.V. High-Bandwidth, Radiation-Resistant Multimode Optical Fiber

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110140070A (zh) * 2016-10-27 2019-08-16 康宁股份有限公司 低弯曲损耗单模光纤
CN113848608A (zh) * 2020-06-28 2021-12-28 中天科技精密材料有限公司 单模光纤及其制备方法
CN113848608B (zh) * 2020-06-28 2023-08-08 中天科技精密材料有限公司 单模光纤及其制备方法

Similar Documents

Publication Publication Date Title
KR100299807B1 (ko) 에르븀 증폭기 영역에서 낮은 분산 구배를 갖는 광섬유
CN1143148C (zh) 在铒放大器区域中具有负色散及低斜率的光纤
EP3432041B1 (fr) Fibre à âmes multiples
US8693830B2 (en) Data-center cable
KR101614943B1 (ko) 싱글 모드 광파이버
Hayashi et al. Low-crosstalk and low-loss multi-core fiber utilizing fiber bend
CN100555014C (zh) 适于室外光纤到用户应用的光纤分支电缆
CN105425335B (zh) 一种通信用抗弯多芯光纤
KR20090049612A (ko) 로우 밴드 손실 단일 모드 광섬유
WO2010119930A1 (fr) Fibre optique multicoeur
EP2057493A1 (fr) Fibre optique présentant de faibles pertes de courbure et comportant une gaine dont la zone annulaire centrale présente un pourcentage d'indice de réfraction relatif négatif
CN112219145B (zh) 多芯光纤和多芯光纤缆线
JP5660627B2 (ja) 多芯単一モード光ファイバおよび光ケーブル
CN111474626A (zh) 一种多芯光纤
EP3812815B1 (fr) Câble à fibres optiques
CN113325510B (zh) 一种多芯光纤及其易分支光缆
WO2016114514A1 (fr) Fibre optique en ruban comprenant des fibres optiques compactes à mode unique
US20110176766A1 (en) Optical fiber connection structure and single-mode fiber
EP4209811A1 (fr) Fibres optiques à très faible perte pour communications longue distance
EP4231065A1 (fr) Fibre optique multicoeur assistée par tranchée avec diaphonie réduite
Sasaki et al. Variations in the Optical Characteristics of 200 μm and 250 μm Coated Multicore Fibres Owing to Cabling
Imada et al. Unique Bending Loss Properties and Design Consideration for Coupled Multi-core Fiber
KR101788628B1 (ko) 소형화된 단일모드 광섬유로 구성된 리본 광섬유
CN113589422A (zh) 一种易于识别的多芯光纤
JP2007521513A (ja) 標準的なシングルモードファイバに対する、高性能指数の分散補償ファイバおよび当該分散補償ファイバを使用する伝送システム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15878158

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15878158

Country of ref document: EP

Kind code of ref document: A1