CN1251985C - Treatment method of reducing hydrogen loss of optical fiber and devices in use for the method - Google Patents
Treatment method of reducing hydrogen loss of optical fiber and devices in use for the method Download PDFInfo
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- CN1251985C CN1251985C CN 200410008654 CN200410008654A CN1251985C CN 1251985 C CN1251985 C CN 1251985C CN 200410008654 CN200410008654 CN 200410008654 CN 200410008654 A CN200410008654 A CN 200410008654A CN 1251985 C CN1251985 C CN 1251985C
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- optical fiber
- deuterium
- treatment chamber
- gas
- deuterium treatment
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 107
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 33
- 239000001257 hydrogen Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims abstract description 105
- 229910052805 deuterium Inorganic materials 0.000 claims abstract description 105
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 67
- 239000000203 mixture Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 238000003672 processing method Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 8
- 230000002950 deficient Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229940085805 fiberall Drugs 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
The present invention relates to an optical fiber deuterium processing method for reducing hydrogen loss of optical fibers and an apparatus used by the method, which is mainly characterized in that When being used for processing optical fibers which are pulled to form in a deuterium treatment mode, the method and the apparatus of the present invention reduce and eliminate the defects existing in the optical fibers so as to reduce the hydrogen loss of optical fibers. The additional loss of the optical fibers treated by the method and the apparatus of the present invention is less than or equal to 0.01 dB/km, when the hydrogen loss is 1383 nm.
Description
Technical field
The present invention relates to a kind of treatment process and this method institute use equipment that reduces the optical fiber hydrogen loss, relate in particular to the deuterium treatment process and the employed deuterium treatment facility of this technology of optical fiber.
Background technology
Current, Fibre Optical Communication Technology continues to develop towards two-forty large vol direction.Concrete technical development approach mainly comprises the channel number that improves single-channel transfer rate and increase wavelength-division multiplex (WDM).In order to increase the multiplexing channel number of WDM, two approach are arranged, one reduces channel spacing; Its two, the expansion optical fiber available band.Optic fibre manufacturing technology is always in the available band effort for expansion optical fiber.
Since producing the silica glass single-mode fiber that first loss be lower than 20dB/km from Corning Incorporated in 1970, the operation wavelength of optical fiber (being also referred to as " window ") is expansion constantly.Before nineteen ninety, optical fiber mainly contains 3 windows: i.e. 850nm, 1310nm and 1550nm are called first, second and the 3rd window.These 3 windows are that hydroxyl (OH) the ionic absorption peak (being also referred to as " water peak ") that is positioned at 950nm, 1250nm and 1385nm is separated.Before and after nineteen ninety-five, open up the L wavestrip of 1625nm, be called the four-light mouth.New development along with aspect technology such as wavelength-division multiplex (WDM), amplifier and laser sources, how to eliminate OH ionic absorption peak, open the 5th window of 1350-1450nm, seem important day by day thereby make the operation wavelength of single-mode fiber extend to 1625nm always from 1260nm.
The technical superiority of this low-water-peak fiber is: the first, operating wavelength range than conventional single-mode fiber broadening 100nm, this means the channel spacing of more WDM channel or broad will help reducing system cost.The second, have only conventional single-mode fiber in below 1/2 of 1550nm dispersion values in the chromatic dispersion of 1350-1450nm wavelength region, this means that in that not need transmission range under the dispersion compensation situation to double many, this helps reducing system cost.The 3rd, utilize low-water-peak fiber, can carry out different transmission at different wave bands, multiple service is provided.For example, different transmission standard---digital-to-analogs, different transfer rates---low speed/at a high speed, different transmission content---voice/images etc. can be assigned to optimum wave band, and will be by an Optical Fiber Transmission, not only convenient but also economical.
For low-water-peak fiber, the IEC60793-2-50 standard has strict regulation, and promptly optical fiber must be less than or equal to the reduction coefficient of 1310nm regulation through the maximum attenuation coefficient of optical fiber hydrogen loss at 1383 ± 3nm.The ITU-T standard is also with reference to the IEC60793-2-50 standard.
At present, optical fiber at high temperature draws to be optical fiber all by the preparation of prefabricated rods again.The method of making preform comprises outside vapour deposition process (OVD), modified chemical vapor deposition process (MCVD) (MCVD), axial vapor deposition method (VAD) and plasma chemical vapor deposition (PCVD).For pipe outer method (OVD and VAD),, can reduce the content of OH group by the pyrochemistry dehydration; For method (PCVD and MCVD) in the pipe, because hydrogen containing foreign and hydroxyl impurity in the starting material halogenide, the aqueous vapor of current-carrying gas, and the OH in quartz glass tube diffusion, there is not the step of chemical dehydration again, make OH content want high with respect to OVD and VAD method, but can be by exquisite starting material, purifying carrier gas to remove the moisture that gas was contained, closed system adopts the quartz glass tube and the induction furnace of low OH content to melt methods such as shortening rod into, reduces the OH content in the prefabricated rods.
And obtain optical fiber by the high temperature wire drawing, exist defective, the existence of these defectives can cause optical fiber added losses after hydrogen loss obviously to increase, and makes after the hydrogen loss reduction coefficient at 1383 ± 3nm greater than the reduction coefficient of 1310nm regulation, does not meet the standard of low-water-peak fiber.How to eliminate defective, become the focus that industry is paid close attention to for the moment.In optical fiber, main defect structure is Si-OO-Si, is called as the hollow defective of non-bridging oxygen (NBOHCs), when in the atmospheric environment or the cable material hydrogen scattering and permeating of separating out when going in the optical fiber, react with the defect structure of thermodynamic instability attitude, form the silicon hydroxyl
This has caused the increase of added losses after the hydrogen loss.Though, such as reduce wire-drawing temperature, reduction receipts thread tension etc. by the optimization of drawing process, can reduce the defective in the optical fiber, the additional attenuation after the hydrogen loss has still surpassed the degree that the low-water-peak fiber standard is allowed.
Therefore, need a kind of production technique that can reduce defective in the optical fiber, and the employed equipment of this technology.
Summary of the invention
The object of the invention provides a kind of treatment process that reduces the optical fiber hydrogen loss.This method can reduce the added losses that the optical fiber hydrogen loss is produced.
Another object of the present invention provides and reduces the employed optical fiber deuterium of optical fiber hydrogen loss treatment process treatment facility.
Below explain in detail know-why of the present invention.
The ventilation property of silica glass is more much bigger than simple glass, is equivalent to send 10 times of Simon Rex glass, and there is suitable micro channel in 300 times of soda-lime glass in this explanation silica glass.Work as D
2When scattering and permeating is gone in the optical fiber, occupy the hollow defective of non-bridging oxygen in advance, this chemical reaction process is by following expression:
Form Si-O-D in the represented chemical reaction process of reaction formula (2), this chemical reaction process need be considered the variation of bond energy, and this changes mainly from two aspects, the one, and disassociation D
2The time absorb energy, the 2nd, the energy that discharges when the OD key forms, from the data of table 1, the energy variation that can calculate this reaction is that-498.8kJ/mol illustrates that this is reflected on the energy is quite favourable.
The bond energy of table 1 related substances
| Material | H 2 | D 2 | H 2O | D 2O |
| Bond energy (kJ/mol) | 436 | 443 | 463.5 | 470.9 |
In optical fiber, also there is the possibility that following chemical reaction takes place:
In this chemical reaction, being changed to+7.8kJ/mol of bond energy, i.e. this reaction is thermo-negative reaction, be disadvantageous on energy, so that in the use of optical fiber, the represented chemical reaction of formula (3) is difficult to carry out, these just can't form the OH group in optical fiber.
The vibration absorption peak of OH, because the OH chemical bond is flexible or bending motion causes, and these vibrations are to be similar to simple harmonic quantity.Frequency computation part formula according to simple harmonic oscillation
Wherein μ is into the reduced mass of key two atoms, μ=m
1* m
2/ (m
1+ m
2), m
1And m
2It is respectively the quality of two atoms; K is the bond force constant of the Cheng Jian of two atoms institute, can think approx to be directly proportional with the size of bond energy.The wavelength such as the table 2 of the vibration absorption peak correspondence of OH can calculate the wavelength of the vibration absorption peak correspondence of OD so by table 1 and formula (4), the result is as shown in table 2:
The contrast of the vibration absorption peak of table 2 OH and OD
| Frequency | OH(μm) | OD(μm) |
| v1+2v3 | 1.24 | 1.69 |
| 2v3 | 1.38 | 1.88 |
| 2v1+v3 | 1.90 | 2.59 |
| v1+v3 | 2.22 | 3.03 |
| v3 | 2.72 | 3.71 |
According to the data in the table 2 as can be known, the main vibration absorption peak of OD has moved on to more than the 1600nm.
Defect density in optical fiber is quite low in fact, for the optical fiber behind the prefabricated stick drawn wire, can determine its concentration by the added losses of hydrogen loss.In glass fibre, when the concentration of OH group is 10ppb, because its caused loss of absorption of vibrations is 0.66dB/km.For example when added losses were 0.033dB/km, according to Law of Lambert-Beer, the concentration of its defective was 0.5ppb.For the defect density of ppb magnitude, be in 0.5～3% the gas mixture when optical fiber is in deuterium gas concentration, its diffusion impellent is sizable, is equivalent to 10
7Magnitude.For optical fiber, its external diameter is less than 0.28mm in addition.All these helps using D
2Reduce the validity of optical fiber hydrogen loss.
A kind of optical fiber deuterium treatment process that reduces the optical fiber hydrogen loss provided by the invention, this method comprises the following steps: pending optical fiber after drawing moulding is placed in the optical fiber deuterium treatment chamber, rare gas element is passed in the optical fiber deuterium treatment chamber purges, temperature in the optical fiber deuterium treatment chamber is heated to 25 to 50 ℃, to vacuumize in the optical fiber deuterium treatment chamber, with deuterium gas concentration is that the mixed gas of 0.5% to 3% deuterium gas and nitrogen feeds in the optical fiber deuterium treatment chamber, and makes this indoor mixture pressure reach 1.01 * 10
5Pa to 2.02 * 10
5Pa kept this room temp and pressure 10 to 30 hours, rare gas element is fed in the optical fiber deuterium treatment chamber also this room temp is cooled to normal temperature, and the gas in the optical fiber deuterium treatment chamber is released.
A kind of optical fiber deuterium treatment process that reduces the optical fiber hydrogen loss of the present invention, wherein: rare gas element continues 15 minutes to the purge of optical fiber deuterium treatment chamber, the optical fiber deuterium is handled the room temp heating and is remained on 40 ℃, deuterium gas content is 2% in the mixed gas of feeding optical fiber deuterium treatment chamber, and mixture pressure is 1.15 * 10 in the optical fiber deuterium treatment chamber
5Pa, optical fiber deuterium treatment chamber was kept this temperature and pressure 20 hours.
A kind of optical fiber deuterium treatment facility that reduces the optical fiber hydrogen loss provided by the invention, this equipment comprises: deuterium gas inlet is used for deuterium gas or deuterium gas gas mixture are input to the deuterium treatment chamber; Flow controlling unit is used to measure and control the gas that is input to the deuterium treatment chamber; Inert gas entrance is used for rare gas element is input to the deuterium treatment chamber; Thermometric and temperature conditioning unit are used to measure and control the temperature that deuterium is handled indoor gas; Vacuum interface is used for the deuterium treatment chamber is vacuumized processing; The pressure display unit is used to indicate deuterium treatment chamber internal gas pressure; Optical fiber deuterium treatment chamber is used to hold the optical fiber that draws moulding and carries out the deuterium processing therein; Pressure control unit is used to control deuterium treatment chamber internal gas pressure; Bleed outlet is used to discharge deuterium and handles indoor gas.
In the above-mentioned optical fiber deuterium treatment facility of the present invention, for being handled room temp, heats deuterium, can in the deuterium treatment chamber, heating unit be installed, be each composition of making mixed gas uniform distribution and fully contact in the deuterium treatment chamber with optical fiber, the gas disturbance device is installed, and the bleed outlet of deuterium treatment chamber is installed in deuterium treatment chamber upper end in the deuterium treatment chamber.Above-mentioned optical fiber deuterium treatment facility of the present invention also can be used for the hydrogen loss of optical fiber to be handled.
Use rare gas element, main purpose is to keep the cleaning of optical fiber processing chamber and the safety of working space; Indoor in optical fiber processing, heating unit and gas disturbance device are arranged, realize even heating and strengthen the effect that deuterium gas spreads; Bleed outlet design is in the upper end of treatment chamber, helps hazardous gas such as deuterium gas and drains.
Beneficial effect of the present invention (1) can reduce the hydrogen loss of optical fiber at 1383nm, added losses maximum value≤0.01dB/km that the optical fiber after deuterium is handled is caused by hydrogen loss; (2) the present invention can additionally not produce the disagreeableness waste of environment when implementing, and also can not cause damage to human body in implementation process; (3) art breading compact equipment of the present invention is taken up an area of and is lacked low cost of manufacture, safety performance height; (4) equipment of the present invention also can be used for the hydrogen loss of optical fiber.
Description of drawings
Fig. 1 carries out deuterium to drawing moulding optical fiber to handle employed equipment.
The represented equipment unit of mark shown in the figure is: mark 1 is represented D
2Or D
2The deuterium gas inlet of gas mixture, mark 2 is represented flow controlling unit, mark 3 is represented other inert gas entrances, mark 4 is represented thermometric and temperature conditioning unit, and mark 5 is represented vacuum interface, and mark 6 is represented gate valve, mark 7 representative pressure display units, mark 8 is represented optical fiber deuterium treatment chamber, mark 9 representative pressure control units, and mark 10 is represented bleed outlet.
Embodiment
The optical fiber of moulding will be drawn, put in the optical fiber deuterium treatment chamber 8 shown in Figure 1, fed purified inert gas purge equipment 15 minutes by inert gas entrance 3, and then the temperature in the optical fiber deuterium treatment chamber is heated to 25 to 50 ℃, optimum temps is 40 ℃, to vacuumize in the treatment chamber subsequently, in the deuterium treatment chamber, feed the mixed gas of deuterium gas and nitrogen by deuterium gas inlet 1, wherein the concentration of deuterium gas is 0.5% to 3%, best deuterium gas concentration is 2%, the pressure 1.01 * 10 of mixed gas in the optical fiber deuterium treatment chamber
5Pa to 2.02 * 10
5Pa, optimum pressure are 1.15 * 10
5Pa, kept this state 10 to 30 hours, Best Times is 20 hours, and then by inert gas entrance 3 feeding rare gas elementes deuterium is handled the room temp cool to room temperature, then the gas in the deuterium treatment chamber is released in the atmosphere by bleed off mouth 10, to guarantee the safety of working space.After the deuterium processing, the added losses≤0.01dB/km of optical fiber hydrogen loss.
For making accompanying drawing of the present invention concisely clear, in Fig. 1, do not express heating unit and the gas disturbance device installed in the optical fiber deuterium treatment chamber.Heating unit is used for the gas in the deuterium treatment chamber is heated, is incubated, and the gas disturbance device is used to make the continuous convection current of mixed gas in the deuterium treatment chamber, keeps interior each position mixed gas composition of deuterium treatment chamber even, and guarantees that gas fully contacts with optical fiber.
Claims (6)
1. optical fiber deuterium treatment process that reduces the optical fiber hydrogen loss, this method comprises the following steps:
Pending optical fiber after drawing moulding is placed in the optical fiber deuterium treatment chamber,
Rare gas element be passed in the optical fiber deuterium treatment chamber purge,
Temperature in the optical fiber deuterium treatment chamber is heated to above 40 ℃ and be no more than 50 ℃ scope, will vacuumizes in the optical fiber deuterium treatment chamber,
With deuterium gas concentration is that the mixed gas of 0.5% to 3% deuterium gas and nitrogen feeds in the optical fiber deuterium treatment chamber,
Make this indoor mixture pressure reach 1.01 * 10
5Pa to 2.02 * 10
5Pa,
Kept this room temp and pressure 10 to 20 hours,
Rare gas element is fed in the optical fiber deuterium treatment chamber and this room temp is cooled to normal temperature,
Gas in the optical fiber deuterium treatment chamber is released.
2. according to a kind of optical fiber deuterium treatment process that reduces the optical fiber hydrogen loss of claim 1, it is characterized in that:
Rare gas element continues 15 minutes to the purge of optical fiber deuterium treatment chamber,
Deuterium gas content is 2% in the deuterium gas of feeding optical fiber deuterium treatment chamber and the nitrogen mixture body,
Mixture pressure is 1.15 * 10 in the optical fiber deuterium treatment chamber
5Pa,
Optical fiber deuterium treatment chamber was kept this temperature and pressure 20 hours.
3. optical fiber deuterium treatment facility that reduces the optical fiber hydrogen loss, this equipment comprises:
Deuterium gas inlet is used for deuterium gas or deuterium gas gas mixture are input to the deuterium treatment chamber;
Flow controlling unit is used to measure and control the gas that is input to the deuterium treatment chamber;
Inert gas entrance is used for rare gas element is input to the deuterium treatment chamber;
Thermometric and temperature conditioning unit are used to measure and control the temperature that deuterium is handled indoor gas;
Vacuum interface is used for the deuterium treatment chamber is vacuumized processing;
The pressure display unit is used to indicate deuterium treatment chamber internal gas pressure;
Optical fiber deuterium treatment chamber is used to hold the optical fiber that draws moulding and carries out the deuterium processing therein;
Pressure control unit is used to control deuterium treatment chamber internal gas pressure;
Bleed outlet is used to discharge deuterium and handles indoor gas;
Heating unit is installed in the optical fiber deuterium treatment chamber, is used for that deuterium is handled room temp and heats.
4. the optical fiber deuterium treatment facility of reduction optical fiber hydrogen loss according to claim 3 is characterized in that the gas disturbance device is installed in the optical fiber deuterium treatment chamber, each composition that is used to make mixed gas uniform distribution and fully contact with optical fiber in the deuterium treatment chamber.
5. the optical fiber deuterium treatment facility of reduction optical fiber hydrogen loss according to claim 3 is characterized in that the upper end of bleed outlet design at the deuterium treatment chamber.
6. the purposes of the optical fiber deuterium treatment facility of reduction optical fiber hydrogen loss according to claim 3 is characterized in that this equipment is used for the hydrogen loss processing of optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008654 CN1251985C (en) | 2004-03-18 | 2004-03-18 | Treatment method of reducing hydrogen loss of optical fiber and devices in use for the method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008654 CN1251985C (en) | 2004-03-18 | 2004-03-18 | Treatment method of reducing hydrogen loss of optical fiber and devices in use for the method |
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| Publication Number | Publication Date |
|---|---|
| CN1562844A CN1562844A (en) | 2005-01-12 |
| CN1251985C true CN1251985C (en) | 2006-04-19 |
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|---|---|---|---|
| CN 200410008654 Expired - Lifetime CN1251985C (en) | 2004-03-18 | 2004-03-18 | Treatment method of reducing hydrogen loss of optical fiber and devices in use for the method |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8111961B2 (en) * | 2008-02-26 | 2012-02-07 | Ofs Fitel, Llc | Accelerated aging of phosphorus-doped optical fibers |
| CN102757187A (en) * | 2011-04-27 | 2012-10-31 | 三星(海南)光通信技术有限公司 | Deuterium treating device and method for optical fiber |
| CN103962021B (en) * | 2014-05-07 | 2016-06-22 | 江苏亨通光纤科技有限公司 | A kind of concentration, the adjustable optical fiber deuterium matching method of Simultaneous Pressure |
| CN108129036B (en) * | 2016-03-31 | 2020-08-21 | 杭州富通通信技术股份有限公司 | Process for manufacturing optical fiber |
| CN108929050A (en) * | 2017-05-24 | 2018-12-04 | 中天科技光纤有限公司 | A kind of optical fiber deuterium processing unit, system and method |
| CN112634994A (en) * | 2021-01-18 | 2021-04-09 | 杭州永特信息技术有限公司 | Method for establishing combination of deuterium concentration and treatment time for optical fiber deuterium treatment |
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Assignee: Nanjing Fiberhome Fujikura Optical Communication Ltd. Assignor: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. Contract fulfillment period: 2007.9.17 to 2013.9.16 Contract record no.: 2009420010004 Denomination of invention: Treatment method of reducing hydrogen loss of optical fiber and devices in use for the method Granted publication date: 20060419 License type: Exclusive license Record date: 20090328 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.9.17 TO 2013.9.16; CHANGE OF CONTRACT Name of requester: NANJING FENGHUOTENG CANGGUANG COMMUNICATION CO., L Effective date: 20090328 |
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