CN117666010A - Method and device for stabilizing near infrared bismuth luminescence center in bismuth-doped silicate optical fiber - Google Patents
Method and device for stabilizing near infrared bismuth luminescence center in bismuth-doped silicate optical fiber Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 123
- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 65
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 49
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 28
- 238000005086 pumping Methods 0.000 claims abstract description 62
- 238000004061 bleaching Methods 0.000 claims abstract description 24
- 238000004020 luminiscence type Methods 0.000 claims abstract description 20
- 230000002427 irreversible effect Effects 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims description 48
- 230000008859 change Effects 0.000 claims description 26
- 238000000295 emission spectrum Methods 0.000 claims description 23
- 238000000411 transmission spectrum Methods 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims description 19
- 238000001228 spectrum Methods 0.000 claims description 19
- 238000000862 absorption spectrum Methods 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 229910052724 xenon Inorganic materials 0.000 claims description 8
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 4
- 229910005793 GeO 2 Inorganic materials 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 5
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000002441 reversible effect Effects 0.000 description 8
- OXEOYJOKKOUHOJ-UHFFFAOYSA-N bismuth erbium Chemical compound [Er].[Bi] OXEOYJOKKOUHOJ-UHFFFAOYSA-N 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- -1 i.e. Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002189 fluorescence spectrum Methods 0.000 description 1
- 238000012966 insertion method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
- C03C13/046—Multicomponent glass compositions
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Luminescent Compositions (AREA)
Abstract
A method and a device for stabilizing near infrared bismuth luminescence center in bismuth-doped silicate optical fiber belong to the technical field of optical fiber preparation and solve the problem of instability in the application process of bismuth-doped optical fiber. The method of the invention comprises the following steps: the photo-bleaching effect of the near infrared bismuth luminescence center induced by the pumping light irradiation seriously affects the luminescence stability of the bismuth-doped optical fiber, and further affects the long-term stable service performance of the optical fiber laser/amplifier. The invention provides a method for stabilizing near infrared bismuth luminescence centers in bismuth-doped silicate optical fibers, which eliminates irreversible photo-bleaching effects in the optical fibers by repeated pumping, can stabilize the quantity of near infrared bismuth luminescence centers based on the method and can establish new standards for evaluating the quality and luminescence performance of bismuth-doped optical fibers. The preparation method is suitable for preparing bismuth-doped silicate optical fibers.
Description
Technical Field
The application relates to the technical field of optical fiber preparation, in particular to preparation of bismuth-doped silicate optical fibers.
Background
In the 21 st century, with the continuous explosive increase of information transmission capacity, new broadband near infrared luminescent materials are required to be developed to fill the gap of the existing communication window. In 2001, fujimoto reports ultra-wideband near-infrared light-emitting bismuth-doped quartz glass for the first time, the spectral range is 1000-1600nm, the light-emitting life at room temperature is 630 microseconds, and then, research on near-infrared light-emitting characteristics of bismuth-doped glass including silicate-doped glass, germanate-doped glass, phosphate-doped glass and borate-doped glass is started. In 2005, dianov et al reported bismuth doped aluminosilicate glass fibers prepared based on modified chemical vapor deposition techniques and achieved continuous laser emission in the 1150-1300nm range. In 2012, professor Gang-Ding Peng et al, university of new south wiles, proposed further broadening of bismuth-doped fiber emission bandwidth by co-doping with erbium, and prepared bismuth-erbium co-doped fiber by improved chemical vapor deposition and solution doping techniques, which can obtain ultra-wideband luminescence covering O-L band under single wavelength excitation. In 2013, wang Tianshu et al reported in patent CN103036135A an L-band broadband multi-wavelength tunable fiber laser based on erbium-doped bismuth fiber, tunable range was 1555-1620nm, tunable bandwidth was 65nm. In 2014, zhang Yaojing et al reported in patent CN103682961a an ultra-wideband fiber light source system based on erbium-doped fiber, bismuth-doped fiber and semiconductor pump laser, with emission range of 1100nm-1600nm.2021, luo Guwei et al reported in patent CN112689928a bismuth doped fiber amplifier system that allowed for an extended O-band transmission range and O-band transmission capacity with a 6dB gain bandwidth greater than 60nm, and the disclosed embodiments were capable of extending 400GBASE-LR-8 transmission distances to approximately 40km over an optical fiber compliant with ITU-t g.652 industry standards. Patent CN113540951A reports an ultra-wideband light source based on bismuth-erbium co-doped optical fibers, realizes high-brightness ultra-wideband fluorescence spectrum with the spectral range of 1400-1700nm, and has the total output power of 0.35-0.84 mW.
Although bismuth-doped glass and optical fibers show excellent near infrared luminescence properties such as wide bandwidth, long service life and the like, the bismuth-doped glass and optical fibers have good application prospects in meeting communication requirements, as the luminescence characteristics of bismuth-doped optical materials are greatly influenced by matrix materials, the luminescence mechanism of bismuth is still not clear, and post-treatment induced thermal darkening, thermal bleaching, photodarkening, photobleaching and the like have obvious influences on near infrared bismuth luminescence centers, so that the long-term stable application of lasers/amplifiers based on bismuth-doped optical fibers is seriously influenced. It is therefore desirable to find a method that can stabilize the near infrared bismuth luminescent center in bismuth-doped optical fibers.
Disclosure of Invention
The invention aims to solve the problem of instability in the application process of the existing bismuth-doped optical fiber, and provides a method and a device for stabilizing the near infrared bismuth luminescence center in the bismuth-doped silicate optical fiber.
The invention is realized by the following technical scheme, and in one aspect, the invention provides a method for stabilizing a near infrared bismuth luminescence center in a bismuth-doped silicate optical fiber, which comprises the following steps: irreversible photo-bleaching effects in the fiber are eliminated by repeated pumping.
Further, the composition of the optical fiber is SiO 2 ～85，GeO 2 ～12.9，P 2 O 5 ～0.94，Al 2 O 3 ～0.15，Er 2 O 3 ～0.01，Bi 2 O 3 0.16 in mol%.
Further, the optical fiber is a bismuth-doped silicate optical fiber.
Further, the repetitive pumping specifically includes:
step 1, pumping an optical fiber, recording the change of a forward emission spectrum of the optical fiber, observing attenuation of BAC-Si emission intensity in the optical fiber, and stopping pumping if the attenuation tends to be slow or stopped;
step 2, standing the optical fiber for a plurality of hours at room temperature to ensure the optical fiber to recover and relax, and recording the transmission spectrum change of the optical fiber at a plurality of moments between the end of pumping and the recovery and relaxation;
calculating an absorption spectrum according to the white light transmission spectrum, and judging whether the recovery condition of BAC-Si reaches the hundred percent reversibility or not from the angle of BAC-Si absorption change according to the change of the absorption spectrum at the plurality of moments; when the reversibility reaches 100%, the repeated pumping operation can be stopped, otherwise, the step 1 is returned.
Further, the time of the pumping fiber is 1 to 3 hours.
Further, the change of the forward emission spectrum of the recording optical fiber is specifically: the forward emission spectrum of the fiber was recorded every 1 minute for the first 20 minutes, every 2 minutes for the middle 20 minutes, and every 5 minutes for the last 20 minutes.
Further, the optical fiber is kept stand at room temperature for a plurality of hours, specifically: the fiber was allowed to stand at room temperature for more than 72 hours.
Further, in step 2, the plurality of moments are respectively: 5 minutes, 1 hour, 3 hours, 73 hours after the end of pumping.
Further, in step 2, the formula of the calculated absorption spectrum specifically includes:
using the formula
Wherein T is wL A white light transmission spectrum without an optical fiber is used as the loss spectrum measuring device; t (T) FUT The white light transmission spectrum after the optical fiber is connected into the loss spectrum measuring device; l is the length of the measured optical fiber, and is expressed in centimeters.
In a second aspect, the present invention provides an apparatus for a method of stabilizing near infrared bismuth luminescence centers in bismuth doped silicate optical fibers as described above, the apparatus comprising: xenon lamp, spectrum analyzer and continuous fiber laser;
the continuous fiber laser is used for pumping the fiber;
the spectrum analyzer is used for recording the change of the forward emission spectrum of the optical fiber and also used for recording the change of the transmission spectrum of the xenon lamp passing through the optical fiber.
The invention has the beneficial effects that:
the photo-bleaching effect of the near infrared bismuth luminescence center induced by the pumping light irradiation seriously affects the luminescence stability of the bismuth-doped optical fiber, and further affects the long-term stable service performance of the optical fiber laser/amplifier. The invention provides a method for stabilizing near infrared bismuth luminescence centers in bismuth-doped silicate optical fibers, which eliminates irreversible photo-bleaching effects in the optical fibers by repeated pumping, can stabilize the quantity of near infrared bismuth luminescence centers based on the method and can establish new standards for evaluating the quality and luminescence performance of bismuth-doped optical fibers.
The preparation method is suitable for preparing bismuth-doped silicate optical fibers.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of the optical fiber absorption spectrum measuring device (a), the optical fiber forward emission spectrum measuring device (b) and the repeated pumping operation process (c);
FIG. 2 is a graph of the optical fiber forward emission spectrum (a) at each measurement time of the first pump of example 1, bleaching and recovery of BAC-Si luminescence intensity (b) in five repeated pumps;
FIG. 3 is an enlarged portion (b) of the absorption spectrum (a) of the measured optical fiber at each measurement time in the five-time recovery relaxation process in example 1 in the range of 780-850 nm;
fig. 4 is a graph showing the irreversible bleaching and the reversible bleaching percentages during four recovery relaxations in example 1.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to illustrate the present invention and should not be construed as limiting the invention.
In one embodiment, a method for stabilizing near infrared bismuth luminescence centers in bismuth-doped silicate optical fibers, the method comprising: irreversible photo-bleaching effects in the fiber are eliminated by repeated pumping.
In the embodiment, the irreversible photo-bleaching effect in the optical fiber is eliminated by repeated pumping, and based on the method, the quantity of near infrared bismuth luminescent centers can be stabilized and a new standard for evaluating the quality and the luminescent performance of the bismuth-doped optical fiber is established.
In a second embodiment, the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the first embodiment is further defined, and the composition of the optical fiber in the second embodiment is further defined, and specifically includes:
the composition of the optical fiber is SiO 2 ～85，GeO 2 ～12.9，P 2 O 5 ～0.94，Al 2 O 3 ～0.15，Er 2 O 3 ～0.01，Bi 2 O 3 0.16 in mol%.
The method of this embodiment may be directed to BAC-Si, i.e., silicon-related bismuth active sites, in bismuth-doped silicate optical fibers.
In a third embodiment, the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the first embodiment is further defined, and the composition of the optical fiber in the third embodiment is further defined, and specifically includes:
the optical fiber is a bismuth-doped silicate optical fiber.
In this embodiment, the method can be applied to Er-free 2 O 3 The method of this embodiment is directed to BAC-Si, i.e., silicon-related bismuth active sites, in bismuth-doped silicate optical fibers only.
In a fourth embodiment, the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the first embodiment is further defined, and in this embodiment, the specific method for repeating pumping is further defined, and specifically includes:
the repeated pumping specifically comprises the following steps:
step 1, pumping an optical fiber, recording the change of a forward emission spectrum of the optical fiber, observing attenuation of BAC-Si emission intensity in the optical fiber, and stopping pumping if the attenuation tends to be slow or stopped;
step 2, standing the optical fiber for a plurality of hours at room temperature to ensure the optical fiber to recover and relax, and recording the transmission spectrum change of the optical fiber at a plurality of moments between the end of pumping and the recovery and relaxation;
calculating an absorption spectrum according to the white light transmission spectrum, and judging whether the recovery condition of BAC-Si reaches the hundred percent reversibility or not from the angle of BAC-Si absorption change according to the change of the absorption spectrum at the plurality of moments; when the reversibility reaches 100%, the repeated pumping operation can be stopped, otherwise, the step 1 is returned.
In this embodiment, by recording/observing the forward emission spectrum, observing the attenuation of BAC-Si emission intensity in the fiber, if the attenuation tends to be slow or stop, the pumping is stopped; the length of the pumping time only affects the degree of luminescence decay, and the final effect of repeated pumping operation, namely the stable BAC-Si, is not affected.
This embodiment gives a preferred embodiment of the re-pumping which further ensures that irreversible photo-bleaching effects in the fiber are eliminated, based on which the number of near infrared bismuth luminescent centers can be stabilized.
In a fifth embodiment, the present embodiment is a further limitation of the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the fourth embodiment, in the present embodiment, the time for pumping the optical fiber is further limited, and specifically includes:
the length of the pumping time is enough to reflect the trend of attenuation of the BAC-Si emission intensity, taking 1-3 hours.
In this embodiment, the length of the pumping time is selected to ensure that the tendency of the emission intensity of BAC-Si decays with the pumping time can be accurately reflected, in this embodiment, the emission intensity of BAC-Si decays rapidly in the first 20 minutes after the pumping starts, the decay rate becomes smaller in the next 20 minutes, and the attenuation of the emission intensity in the last 20 minutes gradually shows the tendency of saturation, i.e. the pumping time of 1 hour is enough to describe the tendency of the emission intensity of BAC-Si varying with the pumping time.
In a sixth embodiment, the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the fourth embodiment is further defined, in the present embodiment, the change of the forward emission spectrum of the recording optical fiber is further defined, and specifically includes:
the change of the forward emission spectrum of the recording optical fiber is specifically: the forward emission spectrum of the fiber was recorded every 1 minute for the first 20 minutes, every 2 minutes for the middle 20 minutes, and every 5 minutes for the last 20 minutes.
In this embodiment, the attenuation of BAC-Si emission intensity is rapid within the first 20 minutes after the start of pumping, the trend of change can be recorded more accurately by recording the forward emission spectrum of the optical fiber once every 1 minute, the attenuation rate of BAC-Si emission intensity becomes smaller within the middle 20 minutes, the time interval for recording the forward emission spectrum increases with it, the attenuation of BAC-Si emission intensity tends to be saturated within the last 20 minutes, and the time interval for recording the forward emission spectrum further increases.
In a seventh embodiment, the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the fourth embodiment is further defined, wherein the standing of the optical fiber at room temperature for several hours is further defined, and specifically includes:
the optical fiber is kept stand for a plurality of hours at room temperature, and the method specifically comprises the following steps: the fiber was allowed to stand at room temperature for more than 72 hours.
In this embodiment, the pumped fiber is allowed to stand at room temperature for 72 hours to allow sufficient time for the pumped fiber to recover and relax, i.e., to allow sufficient time for bleached inactivated BAC-Si to recover, and the BAC-Si that is reversible in bleaching and irreversible in bleaching is also distinguished during the recovery from standing.
In an eighth embodiment, the method for stabilizing a near infrared bismuth luminescent center in a bismuth doped silicate optical fiber according to the fourth embodiment is further defined, and in the embodiment, the plurality of times in step 2 are further defined, and specifically includes:
in step 2, the plurality of moments are respectively: 5 minutes, 1 hour, 3 hours, 73 hours after the end of pumping.
In this embodiment, the recovery rate of bleached inactivated BAC-Si is eventually smoothed from fast to slow as the rest time after the end of pumping increases, and these time measurements are chosen to be sufficiently accurate to describe the trend of recovery of bleached inactivated BAC-Si.
In a ninth embodiment, the method for stabilizing a near infrared bismuth luminescence center in a bismuth doped silicate optical fiber according to the fourth embodiment is further defined, and in the embodiment, the formula for calculating an absorption spectrum is further defined, and specifically includes:
in step 2, the formula of the calculated absorption spectrum specifically includes:
using the formula
Wherein T is wL A white light transmission spectrum without an optical fiber is used as the loss spectrum measuring device; t (T) FUT The white light transmission spectrum after the optical fiber is connected into the loss spectrum measuring device; l is the length of the measured optical fiber, and is expressed in centimeters.
There is no particular reason or advantage in this embodiment, which is a conventional method of measuring absorption in an optical fiber.
Embodiment ten, this embodiment is an example 1 of a method for stabilizing near infrared bismuth luminescence center in a bismuth doped silicate optical fiber as described above, specifically comprising:
the near infrared bismuth luminescent center (BAC-Si) related to silicon in the bismuth erbium co-doped silicate fiber is stabilized.
Measured optical fiber: the bismuth erbium co-doped silicate optical fiber is prepared by improved chemical vapor deposition and solution doping technology, and the fiber core is composed of SiO 2 ～85，GeO 2 ～12.9，P 2 O 5 ～0.94，Al 2 O 3 ～0.15，Er 2 O 3 ～0.01，Bi 2 O 3 0.16 unit is mol%, and the optical fiber of 100cm is cut off to be used as the optical fiber to be tested;
fig. 1 (a-b) are diagrams of a measuring apparatus in the present embodiment: an absorption spectrum measuring device of an optical fiber is composed of a xenon lamp (6280 NS, newport), a microscope of x40 and a spectrum analyzer (OSA: AQ6374, YOKOGAWA); the 830nm continuous fiber laser and the spectrum analyzer (OSA: AQ6374, YOKOGAWA) form a measuring device of the optical fiber forward emission spectrum.
The x40 microscope functions, among other things, to focus and couple the light from the xenon lamp into the optical fiber.
Fig. 1 (c) is a schematic diagram of the repeated pumping operation in this embodiment:
firstly, recording a transmission spectrum of a xenon lamp passing through an initial measured optical fiber by using a loss spectrum measuring device;
then pumping the detected optical fiber for 1 hour by using an 830nm continuous laser, wherein a spectrum analyzer records the change of the forward emission spectrum of the optical fiber, during the period, the forward emission spectrum of the optical fiber is recorded once every 1 minute in the first 20 minutes, the forward emission spectrum of the optical fiber is recorded once every 2 minutes in the middle 20 minutes, and the forward emission spectrum of the optical fiber is recorded once every 5 minutes in the last 20 minutes;
standing the optical fiber at room temperature for 73 hours after the pumping is finished to ensure that the measured optical fiber has enough relaxation time, and recording the transmission spectrum change of the xenon lamp passing through the measured optical fiber by using a spectrum analyzer at the time of 5 minutes, 1 hour, 3 hours, 73 hours and the like after the pumping is finished;
by the Lap index equationCan fit the change of the luminescence intensity of the bismuth luminescence center related to silicon along with the pumping time, and uses a loss spectrum calculation formula based on an insertion methodCalculating the change of the optical fiber loss spectrum after the pumping and the relaxation recovery process, wherein T wL For the white light transmission spectrum which is not connected with the measured optical fiber in the loss spectrum measuring device, the white light transmission spectrum is recorded once, T FUT The white light transmission spectrum after the measured optical fiber is connected into the loss spectrum measuring device is recorded once before the first pumping is started, and then the moments of 5min, 1h, 3h and 73h after the pumping is finished are recorded once respectively; l is the length of the measured optical fiber, and is expressed in centimeters.
According to the white light transmission spectrum, calculating an absorption spectrum by using a formula 2, and judging whether the recovery condition of BAC-Si reaches the hundred percent reversibility or not from the angle of BAC-Si absorption change through the change of absorption spectrums of 5min, 1h, 3h and 73h after the pumping is finished; when the reversibility reaches 100%, the repeated pumping operation may be stopped.
FIG. 2 shows the photo-bleaching amounts of normalized luminous intensity of BAC-Si in the measured optical fiber after five pumping steps in this example, which are 17.2%, 9.6%, 6.2%, 7.5%, and 7.3%, respectively;
FIG. 3 is an absorption spectrum of the measured optical fiber at each measurement time in the five recovery relaxation process in this example, the absorption in the remaining range is unchanged except the absorption band at 808nm related to BAC-Si, taking the first recovery relaxation as an example, the absorption of the initial light is 0.175dB/cm, the absorption after 5 minutes from the end of pumping is reduced to 0.155dB/cm, and the absorption after 73 hours from the end of pumping is restored to 0.160dB/cm;
fig. 4 is a graph of the percentage of irreversible bleaching and reversible bleaching during four recovery relaxations.
FIG. 2 shows the photo-bleaching amounts of normalized luminous intensity of BAC-Si in the measured optical fiber after five pumps in this example, respectively, 17.2%, 9.6%, 6.2%, 7.5%, 7.3%, and it can be seen that the amount of each pump is gradually reduced, thereby calculating the percentage of irreversible and reversible bleaching during four recovery relaxation, and as a result, as shown in FIG. 4, the percentage of irreversible bleaching is gradually reduced, and the percentage of reversible bleaching is gradually increased until reaching 100%, which means that the photo-bleaching irreversible BAC-Si in the measured optical fiber has been eliminated by repeating the pumping operation, and the photo-bleaching reversible BAC-Si is gradually increased during the subsequent pumping and recovery relaxation.
The analysis of the results in combination with fig. 2-4 shows that the unbleached irreversible BAC-Si in the bismuth erbium co-doped fiber can be eliminated by repeated pumping, and the unbleached reversible BAC-Si is gradually increased in the subsequent pumping and restoring relaxation process, so that the BAC-Si in the bismuth erbium co-doped fiber can be determined to be stable, the unbleached reversible and the unbleached irreversible, and the quantity of BAC-Si in the fiber can be stabilized, and a new standard for evaluating the quality and the luminous performance of the bismuth erbium co-doped fiber can be further established based on the method.
Claims (10)
1. A method of stabilizing near infrared bismuth luminescence centers in bismuth doped silicate optical fibers, the method comprising: irreversible photo-bleaching effects in the fiber are eliminated by repeated pumping.
2. The method for stabilizing near infrared bismuth luminescence center in bismuth doped silicate fiber according to claim 1, wherein said fiber has a composition of SiO 2 ～85，GeO 2 ～12.9，P 2 O 5 ～0.94，Al 2 O 3 ～0.15，Er 2 O 3 ～0.01，Bi 2 O 3 0.16 in mol%.
3. The method of stabilizing near infrared bismuth luminescent centers in a bismuth doped silicate fiber according to claim 1, wherein said fiber is a bismuth doped silicate fiber.
4. The method for stabilizing near infrared bismuth luminescence centers in bismuth doped silicate optical fiber according to claim 1, wherein the re-pumping specifically comprises:
step 1, pumping an optical fiber, recording the change of a forward emission spectrum of the optical fiber, observing attenuation of BAC-Si emission intensity in the optical fiber, and stopping pumping if the attenuation tends to be slow or stopped;
step 2, standing the optical fiber for a plurality of hours at room temperature to ensure the optical fiber to recover and relax, and recording the transmission spectrum change of the optical fiber at a plurality of moments between the end of pumping and the recovery and relaxation;
calculating an absorption spectrum according to the white light transmission spectrum, and judging whether the recovery condition of BAC-Si reaches the hundred percent reversibility or not from the angle of BAC-Si absorption change according to the change of the absorption spectrum at the plurality of moments; when the reversibility reaches 100%, the repeated pumping operation can be stopped, otherwise, the step 1 is returned.
5. The method of stabilizing near infrared bismuth luminescent centers in a bismuth doped silicate fiber according to claim 4, wherein the time of the pumping fiber is 1-3 hours.
6. The method for stabilizing near infrared bismuth luminescence center in bismuth doped silicate fiber according to claim 4, wherein the recording fiber forward emission spectrum changes, specifically: the forward emission spectrum of the fiber was recorded every 1 minute for the first 20 minutes, every 2 minutes for the middle 20 minutes, and every 5 minutes for the last 20 minutes.
7. The method for stabilizing near infrared bismuth luminescence center in bismuth doped silicate fiber according to claim 4, wherein the fiber is allowed to stand at room temperature for several hours, specifically: the fiber was allowed to stand at room temperature for more than 72 hours.
8. The method for stabilizing near infrared bismuth luminescent centers in bismuth doped silicate optical fiber according to claim 4, wherein in step 2, the several moments are respectively: 5 minutes, 1 hour, 3 hours, 73 hours after the end of pumping.
9. The method for stabilizing near infrared bismuth luminescence center in bismuth doped silicate fiber according to claim 4, wherein in step 2, the calculated absorption spectrum formula is specifically:
using the formula
Wherein T is wL A white light transmission spectrum without an optical fiber is used as the loss spectrum measuring device; t (T) FUT The white light transmission spectrum after the optical fiber is connected into the loss spectrum measuring device; l is the length of the measured optical fiber, and is expressed in centimeters.
10. An apparatus for use in the method of stabilizing near infrared bismuth luminescent centers in bismuth doped silicate optical fiber as claimed in claims 1-9, wherein the apparatus comprises: xenon lamp, spectrum analyzer and continuous fiber laser;
the continuous fiber laser is used for pumping the fiber;
the spectrum analyzer is used for recording the change of the forward emission spectrum of the optical fiber and also used for recording the change of the transmission spectrum of the xenon lamp passing through the optical fiber.
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| CN202311549287.9A CN117666010A (en) | 2023-11-21 | 2023-11-21 | Method and device for stabilizing near infrared bismuth luminescence center in bismuth-doped silicate optical fiber |
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| CN202311549287.9A CN117666010A (en) | 2023-11-21 | 2023-11-21 | Method and device for stabilizing near infrared bismuth luminescence center in bismuth-doped silicate optical fiber |
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