CN106324749A - Few-mode optical fiber used for amplifier - Google Patents

Few-mode optical fiber used for amplifier Download PDF

Info

Publication number
CN106324749A
CN106324749A CN201610914554.1A CN201610914554A CN106324749A CN 106324749 A CN106324749 A CN 106324749A CN 201610914554 A CN201610914554 A CN 201610914554A CN 106324749 A CN106324749 A CN 106324749A
Authority
CN
China
Prior art keywords
sandwich layer
amplifier
optical fiber
mode optical
fundamental mode
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.)
Granted
Application number
CN201610914554.1A
Other languages
Chinese (zh)
Other versions
CN106324749B (en
Inventor
陈苏
杨玉诚
曹蓓蓓
朱继红
汪洪海
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.)
Yangtze Optical Fibre and Cable Co Ltd
Original Assignee
Yangtze Optical Fibre and Cable 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 Yangtze Optical Fibre and Cable Co Ltd filed Critical Yangtze Optical Fibre and Cable Co Ltd
Priority to CN201610914554.1A priority Critical patent/CN106324749B/en
Publication of CN106324749A publication Critical patent/CN106324749A/en
Application granted granted Critical
Publication of CN106324749B publication Critical patent/CN106324749B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • G02B6/02004—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
    • G02B6/02023—Based on higher order modes, i.e. propagating modes other than the LP01 or HE11 fundamental mode
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

The invention relates to a few-mode optical fiber used for an amplifier. The optical fiber comprises core layers and a covering layer. The optical fiber is characterized in that the core layers include the inner core layer and the outer core layer, the relative refractivity difference delta1 of the inner core layer is -0.1-0.2%, the radius R1 is 2-5 micrometers, the outer core layer closely surrounds the inner core layer, the relative refractivity difference delta2 of the outer core layer is 0.5-1.5%, the radius R2 is 6-12 micrometers, and the covering layer closely surrounds the outer core layer and is a pure quartz glass layer. The optical fiber is simple in structure and easy to manufacture. The special indented-ring-shaped core layer design is adopted, effective refractivity difference between modes can be effectively increased, mode coupling is reduced, and accordingly the coupling problem between the modes is solved better. By suppressing some high-order modes easy to couple, coupling between transmission modes required by a system is reduced, and the high-order mode capable of simultaneously transmitting multiple low crosstalks is achieved.

Description

A kind of less fundamental mode optical fibre for amplifier
Technical field
The present invention relates to a kind of optical fiber in optic communication amplifier, particularly relate to few mould of a kind of erbium-based amplifier Optical fiber.
Background technology
The advantages such as single-mode fiber is fast due to its transfer rate, carries information capacity big, long transmission distance, are widely used Among optical communication network.And in recent years, along with the demand of capacity is grown with each passing day by communication and big data service, the network bandwidth is fast Speed expansion, the capacity of optical transport network is the most progressively close to the shannon limit of simple optical fiber: 100Tb/s.Space division multiplexing and mode division are multiple The shannon limit that can break traditions by technology, it is achieved the transmission of more high bandwidth, is the best method solving transmission capacity problem. Support optical fiber i.e. multi-core fiber and the less fundamental mode optical fibre of this multiplex technique.
Experiment shows, uses less fundamental mode optical fibre to combine MIMO technology and can transmit letter under more than one space-propagation mode Number.However as the increase of pattern in optical fiber, in traditional fiber, the process of MIMO will become complicated rapidly, and this will cause The cost of multiplexing and difficulty for higher order mode are greatly increased.
On the other hand, in order to use mode division multiplexing in long distance optic transmission system, need to connect Er-doped fiber in centre Amplifier (EDFA), currently in the system design of mode division multiplexing, EDFA, for single-mode fiber transmission design, works as single mode When EDFA is used for mode division multiplexing system, each pattern from the few mould Transmission Fibers of input needs to be separated, the most each mould Formula is converted into single mode and is individually amplified by single mode EDFA, after amplification, from amplifier output single mode signal again by It is converted into the pattern in few mould Transmission Fibers.This process is extremely complex and cost is the highest.
United States Patent (USP) US8848285 proposes er-doped less fundamental mode optical fibre and fiber amplifier for amplifying multiple pattern simultaneously Device, the program can solve the problem that pattern is amplified simultaneously, but when pattern increases, MIMO process is the most complicated.
The when of it is true that the coupling between pattern is reduced to a certain degree, can avoid using MIMO, thus simplify System, increases reliability and the extensibility of transmission.
Summary of the invention
The technical problem to be solved be the deficiency existed for above-mentioned prior art provide a kind of for The less fundamental mode optical fibre of amplifier, it can not only effective refractive index between effectively raising pattern poor, reduce Mode Coupling with Time transmit the purpose of higher order mode of multiple low crosstalk, and can simplified system.
Introduce summary of the invention for convenience, be defined as follows term:
Prefabricated rods: the radial refractive index distribution being made up of sandwich layer and covering meets optical fiber designs and requires directly to be drawn into The Glass rod of designed optical fiber or assembly；
Plug: the solid glass prefabricated component containing sandwich layer and part of clad；
Radius: the distance between this layer of external boundary and central point；
Refractive index profile: the relation between optical fiber or preform (including plug) glass refraction and its radius；
Refractive index contrast:
niAnd n0It is respectively refractive index and the refractive index of pure silicon dioxide glass of each corresponding optical fiber each several part；
The contribution amount of aluminum (Al): mix aluminum (Al) the quartz glass relative index of refraction difference (Δ relative to pure quartz glass Al), represent that with this mixing aluminum (Al) measures；
The contribution amount of phosphorus (P): p-doped (P) quartz glass relative to the relative index of refraction difference (Δ P) of pure quartz glass, with This represents that p-doped (P) is measured；
MCVD technique: prepare the quartz glass of desired thickness with the vapour deposition improved and sintering process；
Solwution method: enter to form the glassy layer of soot shape in prefabricated rods by rare earth doped by the method for solution soaking In, and form glassy structure by the way of sintering.
Vapor phase method: rare earth element is passed through bushing pipe inwall by the method for gas phase doping, and by dilute by gas phase of high temperature Soil ion Direct precipitation also forms the mode of doping.
Bare fibre: refer to the glass fiber without coat in optical fiber.
The present invention solves that the technical scheme that problem set forth above is used is: include sandwich layer and covering, its feature Being that described sandwich layer includes inner sandwich layer and outer sandwich layer, described inner sandwich layer refractive index contrast Δ 1 is-0.1%～0.2%, Radius R1 is 2 μm～5 μm；Described outer sandwich layer closely surrounds inner sandwich layer, and its refractive index contrast Δ 2 is 0.5%～1.5%, Radius R2 is 6 μm～12 μm, and described covering closely surrounds outer sandwich layer, for pure quartz glass layer.
By such scheme, described outer sandwich layer refractive index contrast from this sandwich layer center to inside and outside successively decrease, successively decrease in Step change type or gradation type.
By such scheme, described inner sandwich layer is mainly mixed with aluminum (Al) and/or phosphorus (P), and a small amount of erbium (Er) that adulterates, inner core Total contribution amount of layer aluminum (Al) and/or phosphorus (P) is 0%～0.2%, and the doping of erbium (Er) is less than or equal to 200ppm.
By such scheme, described outer sandwich layer is mainly mixed with aluminum (Al) and phosphorus (P), and doped with erbium (Er), outer sandwich layer aluminum (Al) and total contribution amount of phosphorus (P) is 0.5%～1.5%, the doping of erbium (Er) is 800ppm-4000ppm.
By such scheme, described inner sandwich layer is mixed with germanium (Ge) and/or fluorine (F), to adjust refractive index size.
By such scheme, described optical fiber supports 2 or more than 2 stable transmission modes at 1550nm wavelength.
By such scheme, 6 stable transmission modes supported at 1550nm wavelength by described optical fiber, are LP01 respectively, LP11, LP21 and LP31, LP41 and LP51.
By such scheme, the LP01 pattern of described optical fiber can keep stable work when bending radius is 5mm.
The beneficial effects of the present invention is: 1, use the ring-type sandwich layer of specific indent to design, it is possible to the common mould less of suppression The part higher order mode propagated in optical fiber, and present in this part of repressed higher order mode and optical fiber, communication mode has Close effective refractive index, is very easy to be formed crosstalk between transmission mode, affects the normal transmission of signal, by suppressing this After part higher order mode, optical fiber has bigger difference, between them between the effective refractive index of remaining communication mode Crosstalk is the lowest, thus effectively reduces the coupling between pattern, reaches to transmit the mesh of the higher order mode of multiple low crosstalk simultaneously 's.2, by design of specifically adulterating, adulterated al and phosphorus while of in sandwich layer so that rare earth erbium ion dissolubility in a fiber carries High, it is achieved high concentration rare earth ion doped, thus in use it is capable of higher gain performance, also improve meanwhile The anti-light sub-darkening performance of optical fiber, improves the service life of optical fiber；3, designed by structure and adulterate design, it is achieved that optical fiber Gain size basic simlarity between each pattern of C-band, and there is good bending property.
Accompanying drawing explanation
Fig. 1 is the optical fiber radial section structural representation of one embodiment of the invention.
Fig. 2 is the Refractive Index Profile of Optical schematic diagram of one embodiment of the invention.
Fig. 3 is the Refractive Index Profile of Optical figure of another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
One embodiment of the present of invention as shown in Figure 1, 2, includes inside and outside two sandwich layers and one layer of covering.Inner sandwich layer 1 by The quartz glass of p-doped (P) or the quartz glass mixed with fluorine and other adulterants (erbium) form, and refractive index contrast is Δ 1, by Prepared by MCVD technique.Outer sandwich layer 2 closely surrounds inner sandwich layer, MCVD technique the quartzy glass that the aluminum (Al) prepared and phosphorus (P) are co-doped with Glass forms, and can erbium doped.Covering 3 closely surrounds outer sandwich layer, forms for pure quartz glass, MCVD or OVD technique prepare, light The radius R3 of fine covering is 62.5 μm.
The coat of the present embodiment optical fiber uses double-coating coating process, and drawing speed is 400-1000m/min, optical fiber straight Footpath is 125 ± 2 μm.
According to the technical scheme of above-mentioned less fundamental mode optical fibre, in the range of its defined, the parameter of optical fiber is designed, and Require to manufacture plug, by sleeve pipe technique, OVD work according to the design of optical fiber by plug manufacturing process such as known MCVD techniques The over cladding process such as skill complete the manufacture of whole prefabricated rods.
The refractive index profile of institute's drawing optical fiber uses NR-9200 equipment (EXFO) to test, the refractive index profile of optical fiber And the major parameter of dopant material is as shown in table 1.
According to the optical fiber manufactured by technical scheme, it supports three to six stable biographies at 1550nm wavelength Defeated pattern, is LP01, LP11, LP21 and LP31 respectively, LP41 and LP51.As shown in table 2.
The Refractive Index Profile of Optical figure of another embodiment of the present invention as it is shown on figure 3, its be mainly characterized by described outside Sandwich layer refractive index contrast from this sandwich layer center to inside and outside successively decrease, successively decrease in gradation type, outer sandwich layer inner side relative Rate variance equals to or more than inner sandwich layer refractive index contrast, and outer sandwich layer outermost refractive index contrast is relative equal to or more than covering Refractivity.Table 1: the structure and material composition of embodiment less fundamental mode optical fibre
Table 2: the Specifeca tion speeification of embodiment less fundamental mode optical fibre

Claims (8)

1., for a less fundamental mode optical fibre for amplifier, include sandwich layer and covering, it is characterised in that described sandwich layer includes inner core Layer and outer sandwich layer, described inner sandwich layer refractive index contrast Δ 1 is-0.1%～0.2%, and radius R1 is 2 μm～5 μm；Described Outer sandwich layer closely surrounds inner sandwich layer, and its refractive index contrast Δ 2 is 0.5%～1.5%, and radius R2 is 6 μm～12 μm, described bag Layer closely surrounds outer sandwich layer, for pure quartz glass layer.
2. the less fundamental mode optical fibre for amplifier as described in claim 1, it is characterised in that described outer sandwich layer relative index of refraction Difference from this sandwich layer center to inside and outside successively decrease, successively decrease in step change type or gradation type.
3. the less fundamental mode optical fibre for amplifier as described in claim 1 or 2, it is characterised in that described inner sandwich layer is mixed with aluminum And/or phosphorus, and a small amount of erbium that adulterates, the contribution amount of inner sandwich layer aluminum and/or phosphorus is 0%～0.05%, the doping of erbium less than or etc. In 200ppm.
4. the less fundamental mode optical fibre for amplifier as described in claim 1 or 2, it is characterised in that described outer sandwich layer mainly mixed with Aluminum and phosphorus, and doped with erbium, total contribution amount of outer sandwich layer aluminum and phosphorus is 0.5%～1.5%, and the doping of erbium is 800ppm- 4000ppm。
5. the less fundamental mode optical fibre for amplifier as described in claim 3, it is characterised in that described inner sandwich layer mixed with germanium and/or Fluorine.
6. the less fundamental mode optical fibre for amplifier as described in claim 1 or 2, it is characterised in that described optical fiber is at 1550nm wavelength Place supports 2 or more than 2 stable transmission modes.
7. the less fundamental mode optical fibre for amplifier as described in claim 6, it is characterised in that described optical fiber is at 1550nm wavelength Support 6 stable transmission modes, be LP01, LP11, LP21 and LP31 respectively, LP41 and LP51.
8. the less fundamental mode optical fibre for amplifier as described in claim 7, it is characterised in that the LP01 pattern of described optical fiber is curved Stable work can be kept when bilge radius is 5mm.
CN201610914554.1A 2016-10-20 2016-10-20 Few-mode optical fiber for amplifier Active CN106324749B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610914554.1A CN106324749B (en) 2016-10-20 2016-10-20 Few-mode optical fiber for amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610914554.1A CN106324749B (en) 2016-10-20 2016-10-20 Few-mode optical fiber for amplifier

Publications (2)

Publication Number Publication Date
CN106324749A true CN106324749A (en) 2017-01-11
CN106324749B CN106324749B (en) 2020-01-14

Family

ID=57819525

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610914554.1A Active CN106324749B (en) 2016-10-20 2016-10-20 Few-mode optical fiber for amplifier

Country Status (1)

Country Link
CN (1) CN106324749B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106707408A (en) * 2017-03-28 2017-05-24 中山大学 Graded index fiber based on ring-structure fiber core
CN108761634A (en) * 2018-03-26 2018-11-06 北京大学 The dual annular core structure optical fiber of one mode weak coupling
CN110297288A (en) * 2019-04-15 2019-10-01 长飞光纤光缆股份有限公司 A kind of low decaying step change type orbital angular momentum optical fiber
CN111517637A (en) * 2020-05-22 2020-08-11 长飞光纤光缆股份有限公司 Rare earth doped multi-core optical fiber, optical fiber preform, preparation method and application thereof
CN113791471A (en) * 2021-09-09 2021-12-14 中山大学 Double-layer fiber core optical fiber with multiband mode weak coupling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1292882A (en) * 1998-04-30 2001-04-25 住友电气工业株式会社 Optical fiber
US6275638B1 (en) * 1997-08-28 2001-08-14 Sumitomo Electric Industries, Ltd. Dispersion-shifted fiber
CN104714273A (en) * 2015-03-31 2015-06-17 长飞光纤光缆股份有限公司 Low-attenuation and few-mode fiber
CN105137536A (en) * 2015-09-18 2015-12-09 长飞光纤光缆股份有限公司 Single-mode fiber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6275638B1 (en) * 1997-08-28 2001-08-14 Sumitomo Electric Industries, Ltd. Dispersion-shifted fiber
CN1292882A (en) * 1998-04-30 2001-04-25 住友电气工业株式会社 Optical fiber
CN104714273A (en) * 2015-03-31 2015-06-17 长飞光纤光缆股份有限公司 Low-attenuation and few-mode fiber
CN105137536A (en) * 2015-09-18 2015-12-09 长飞光纤光缆股份有限公司 Single-mode fiber

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106707408A (en) * 2017-03-28 2017-05-24 中山大学 Graded index fiber based on ring-structure fiber core
CN108761634A (en) * 2018-03-26 2018-11-06 北京大学 The dual annular core structure optical fiber of one mode weak coupling
CN110297288A (en) * 2019-04-15 2019-10-01 长飞光纤光缆股份有限公司 A kind of low decaying step change type orbital angular momentum optical fiber
CN111517637A (en) * 2020-05-22 2020-08-11 长飞光纤光缆股份有限公司 Rare earth doped multi-core optical fiber, optical fiber preform, preparation method and application thereof
CN111517637B (en) * 2020-05-22 2021-04-27 长飞光纤光缆股份有限公司 Rare earth doped multi-core optical fiber, optical fiber preform, preparation method and application thereof
CN113791471A (en) * 2021-09-09 2021-12-14 中山大学 Double-layer fiber core optical fiber with multiband mode weak coupling

Also Published As

Publication number Publication date
CN106324749B (en) 2020-01-14

Similar Documents

Publication Publication Date Title
CN101101354B (en) Fluorine doped optical fiber
CN106443876B (en) A kind of low crosstalk less fundamental mode optical fibre
CN101770051B (en) Low bend loss optical fiber
CN102411168B (en) Low loss optical fiber designs and methods for their manufacture
US9120693B2 (en) Multi-core optical fiber ribbons and methods for making the same
CN106324749A (en) Few-mode optical fiber used for amplifier
CN104698534B (en) A kind of low decay less fundamental mode optical fibre
CN102354019B (en) Bent non-sensitive micro-structured optical fiber and production method thereof
CN105204110B (en) A kind of less fundamental mode optical fibre with relatively low differential mode group delay
CN104714273B (en) Low decaying less fundamental mode optical fibre
CN102308235A (en) Bend insensitive optical fibers with low refractive index glass rings
CN103323908B (en) Single mode fiber and manufacturing method thereof
CN106842419B (en) A kind of broadband bend-insensitive multimode fibre
CN104216045A (en) Optical fiber and manufacturing method thereof
CN108181683B (en) Low-crosstalk large-mode-area multi-core optical fiber and preparation method thereof
CN107608023A (en) A kind of ultralow decay less fundamental mode optical fibre of step change type
CN105223645A (en) A kind of low loss fiber and preparation method thereof
CN104216044B (en) A kind of low attenuation bend-insensitive single-mode optical fiber
CN107247304A (en) A kind of ultralow decay less fundamental mode optical fibre for mode division multiplexing system
CN111807699A (en) Manufacturing method of bending-resistant optical fiber and optical fiber corresponding to manufacturing method
CN103364870B (en) A kind of single-mode fiber and manufacture method thereof
CN106338793A (en) Few-mode fiber
CN108363139A (en) A kind of two mode fibers of ultralow decaying of step change type
CN104261670A (en) Method for manufacturing optical fiber
CN109445023A (en) Doping-optimized ultra-low attenuation single-mode fiber

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant