CN1888970A - Efficient circulating filling-in clad pumping optical fiber amplifier - Google Patents
Efficient circulating filling-in clad pumping optical fiber amplifier Download PDFInfo
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- CN1888970A CN1888970A CN 200610019644 CN200610019644A CN1888970A CN 1888970 A CN1888970 A CN 1888970A CN 200610019644 CN200610019644 CN 200610019644 CN 200610019644 A CN200610019644 A CN 200610019644A CN 1888970 A CN1888970 A CN 1888970A
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Abstract
A high-effective cycling injecting envelope pump fiber amplifier, including: the inputting end separator 4, the series connection standard monofilm fiber 10, the double envelopes fiber 1, the series connection standard monofilm fiber 10, and the outputting end separator 5, the characteristic is: uses the multimode / monofilm mixing WDN parts that consists of the monofilm single-core collimator, the medium filter slice and the multimode / monofilm mixing double-core collimator, and 2*1 multimode fiber combiner 14 to be the cycling injecting structure, the high reflectivity filter slice makes the sparing pump luminous energy to enter the cycling road, improves the pump efficiency of the envelope pump fiber amplifier, and reduces the cost.
Description
Technical field
The present invention relates to a kind of clad pumping optical fiber amplifier, specifically, relate to the clad pumping optical fiber amplifier of a kind of WDM of employing device and multimode optical fiber wave multiplexer circulation pumping configuration.
Background technology
The high-power fiber amplifier of newly-developed generally adopts multimode double clad pump technology, the major advantage of clad pumping optical fiber amplifier is as follows: 1) compare with the fiber core with single-mold pump technology, multimode cladding pumping technology has remarkable advantages, adopt multimode cladding pumping technology, be that pump light is inputed to hundreds of times to thousands of times of xsects among the multimode doubly clad optical fiber of single-mode fiber, therefore, same input optical density, the multimode cladding pumping can allow hundreds of times to the thousands of times inputs to the single mode pumping, thereby realizes the high-power or super high power output of fiber amplifier easily.2) optical texture is simple.3) high-power multimode pumping laser power is big, and cost is low, and the life-span is long, and the whole cost of pump module is reduced significantly.
Yet the cladding pumping mode also is not easy to realize the efficient of pumping, and this is to determine that by its special pumping configuration the raising that this has also directly had influence on the performance of clad pumping optical fiber amplifier has limited the further reduction of amplifier cost.People improve pump conversion efficiency in the doping double-cladding optical fiber by adopting various special optical fiber structures, the effect of these measures is limited, especially work as gain fibre more in short-term, in order to reach enough pumpings, usually bigger pump laser be must adopt, thereby unnecessary waste and excessive heat dissipation problem caused.Recently, someone has proposed to adopt the cladding-pump fiber laser spare (seeing Fig. 1 .1) of loop configuration, its objective is pumping remained to re-inject gain fibre after light is collected by second fiber coupler of the gain fibre other end, realize utilizing once more, improved the utilization factor of pump light.Yet because the special construction (seeing Fig. 1 .2) of the multimode optical fiber wave multiplexer that single mode and multimode are mixed, its covering that is used for the optical fiber of output signal light will inevitably be taken away the part pump light; In addition, the reverse transfer optical loss of multimode optical fiber wave multiplexer is apparently higher than forward, and therefore this method can only collection unit be divided pumping residue light, and the loss of pumping residue light is bigger; On the other hand, increase such fiber coupler and increased manufacture difficulty and whole cost undoubtedly, for image intensifer, be actually worthless.
The present invention proposes a kind of circulation pumping configuration, the technology of ripple is closed in employing based on WDM and multimode optical fiber, re-inject in the gain fibre after whole pumping residue light being collected, can improve pumping efficiency greatly, and have simple advantage, can effectively reduce the cost of whole high-power fiber amplifier.
Summary of the invention
The purpose of this invention is to provide a kind of efficient circulating filling-in clad pumping optical fiber amplifier, by adopting the circulation pump mode, realize the efficient pumping of cladding pumping high-power fiber amplifier,, the cost of high-power fiber amplifier is reduced greatly owing to adopted the pumping of WDM multimode to close wave technology.
The object of the present invention is achieved like this:
A kind of efficient circulating filling-in clad pumping optical fiber amplifier, it comprises input end isolator 4, serial connection standard single-mode fiber 10, WDN device 2, doubly clad optical fiber 1, WDN device 2, serial connection standard single-mode fiber 10, output terminal isolator 5 successively, with loop multimode optical fiber 9,2 * 1 multimode optical fiber wave multiplexers 14, it is characterized in that:
Be connected in series the multimode/single mode mixing WDN device 2 of three ports respectively in doubly clad optical fiber 1 front and back end; The multimode of front end/single mode mixing WDN device 2 is made of the single core collimating apparatus 8 of standard single mode, dielectric filter sheet 6 and multimode/single mode mixing twin-core collimating apparatus 7 three parts successively, the multimode of rear end/single mode mixing WDN device 2 is made of the single core collimating apparatus of multimode/single mode mixing twin-core collimating apparatus 7, dielectric filter sheet 6 and standard single mode 8 three parts successively, comprises doubly clad optical fiber 1 and heavy in section multimode optical fiber 9 in multimode/single mode mixing twin-core collimating apparatus 7;
The light path of doubly clad optical fiber 1 and heavy in section multimode optical fiber 9 is finished multimode light by 6 reflections of dielectric filter sheet and is connected, and the single-mode fiber 10 in the single core collimating apparatus 8 of standard single mode is finished single mode optics through collimation lens with dielectric filter sheet 6 and doubly clad optical fiber 1 and is connected;
The heavy in section multimode optical fiber 9 of the heavy in section multimode optical fiber 9 in the multimode of front end/single mode mixing twin-core collimating apparatus 7 and the multimode of rear end/single mode mixing twin-core collimating apparatus 7; connect by 2 * 1 multimode optical fiber wave multiplexers 14, another input end of 2 * 1 multimode optical fiber wave multiplexers 14 connects the pump laser output terminal.
Aforesaid efficient circulating filling-in clad pumping optical fiber amplifier, it is characterized in that: 2 * 1 multimode optical fiber wave multiplexers 14 are the check configuration of two input-lists output, the heavy in section multimode optical fiber 9 of 14 output termination front end multimode/single mode mixing twin-core collimating apparatus 7 is finished the forward circulation pumping; Perhaps connect the heavy in section multimode optical fiber 9 in the multimode/single mode mixing twin-core collimating apparatus 7 of rear end, finish the recycle back pumping.
A kind of efficient circulating filling-in clad pumping optical fiber amplifier, it comprises input end isolator 4, serial connection standard single-mode fiber 10, WDN device 2, doubly clad optical fiber 1, WDN device 2, serial connection standard single-mode fiber 10, output terminal isolator 5 successively, with loop multimode optical fiber 9,2 * 1 multimode optical fiber wave multiplexers 14 etc., it is characterized in that:
Be connected in series the multimode/single mode mixing WDN device 3 of three ports respectively in doubly clad optical fiber 1 front and back end; The multimode of front end/single mode mixing WDN device 3 is made of the single core collimating apparatus 17 of multimode, dielectric filter sheet 6 and multimode/single mode mixing twin-core collimating apparatus 16 3 parts successively, the multimode of rear end/single mode mixing WDN device 3 is made of the single core collimating apparatus of multimode/single mode mixing twin-core collimating apparatus 16, dielectric filter sheet 6 and multimode 17 3 parts successively, comprises doubly clad optical fiber 1 and standard single-mode fiber 10 in multimode/single mode mixing twin-core collimating apparatus 16;
The light path of the single-mode fiber 10 in doubly clad optical fiber 1 and the multimode/single mode mixing twin-core collimating apparatus 16 is finished single mode optics by collimation lens and 6 reflections of dielectric filter sheet and is connected, and the heavy in section multimode optical fiber 9 in the single core collimating apparatus 17 of multimode is finished optics with dielectric filter sheet 6 with doubly clad optical fiber 1 through collimation lens and is connected;
Heavy in section multimode optical fiber 9 in the single core collimating apparatus 17 of multimode of heavy in section multimode optical fiber 9 in the single core collimating apparatus 17 of the multimode of front end and rear end, connect by 2 * 1 multimode optical fiber wave multiplexers 14, another input end of 2 * 1 multimode optical fiber wave multiplexers 14 connects the pump laser output terminal.
Aforesaid efficient circulating filling-in clad pumping optical fiber amplifier is characterized in that:
2 * 1 multimode optical fiber wave multiplexers 14 are the check configuration of two input-lists output, and the heavy in section multimode optical fiber 9 of 14 output termination front end multimode/single mode mixing twin-core collimating apparatus 7 is finished the forward circulation pumping; Perhaps connect the heavy in section multimode optical fiber 9 in the multimode/single mode mixing twin-core collimating apparatus 7 of rear end, finish the recycle back pumping.
Aforesaid efficient circulating filling-in clad pumping optical fiber amplifier, it is characterized in that: 2 * 1 multimode optical fiber wave multiplexers 14 are the check configuration of two input-lists output, heavy in section multimode optical fiber 9 in the single core collimating apparatus 17 of the multimode of 14 output termination front end is finished the forward circulation pumping; Perhaps connect the heavy in section multimode optical fiber 9 in the single core collimating apparatus 17 of multimode of rear end, finish the recycle back pumping.
2 * 1 multimode optical fiber wave multiplexers 14 are check configuration, have the ripple of closing low loss characteristic, multimode optical fiber technical specification: 105/125/250-0.22A.The pump light (pumping laser and residual pump light) that is injected into the pump light loop when needs is during more than two, can limit according to needs and adopt more 2 * 1 multimode optical fiber wave multiplexers to realize that the pumping of many pump lights injects; Also can adopt N * 1 multimode optical fiber wave multiplexer, and this many infusions are gone into the optical loss that does not additionally increase loop.
Can realize circulating forward or backwards pumping configuration by the direction that changes 2 * 1 multimode optical fiber wave multiplexers to obtain best fiber amplifier characteristic.
Aforesaid efficient circulating filling-in clad pumping optical fiber amplifier, it is characterized in that:, act on each inter-stage flexible allocation pumping light power by the pump light injection of WDM device or the ripple that closes of centrifugation and multimode 2 * 1 (or N * 1) optical fiber wave multiplexer with two-stage or multistage clad pumping optical fiber amplifier serial or parallel connection.
Principle of the present invention is:
The fiber amplifier optical module constitutes multimode pumping optical loop by an input end and the output terminal of preceding multimode/single mode mixing WDM device 2 (or 3), rear-earth-doped doubly clad optical fiber 1, back multimode/single mode mixing WDM 2 (or 3), multimode optical fiber 9,2 * 1 multimode optical fiber wave multiplexers 14; The pump laser luminous power is injected in the pump light loop by the another input end of multimode optical fiber 9 and 2 * 1 multimode optical fiber wave multiplexers 14.
The operation logic of device is such, after pump light injects by multimode optical fiber 9 and 2 * 1 multimode optical fiber wave multiplexers 14, multimode/single mode mixing WDM 2 or 3 by front end is coupled in the inner cladding of doping double-cladding optical fiber 1, when in the inner cladding of doping double-cladding optical fiber 1, transmitting, by with the effect of single mode doped core, absorbed by rare earth ion, realize population inversion, and flashlight is amplified; Unabsorbed pump light is coupled in the multimode optical fiber at the WDM 2 or 3 places of rear end in doping double-cladding optical fiber 1, and through entering first WDM device behind 2 * 1 multimode optical fiber wave multiplexers 14 once more, realizes the circulation injection.
By adopting three port WDM device technologies, optical filter by high reflectance (or high-transmission rate) efficiently is injected into pump light in the gain fibre on the one hand, on the other hand residual pump light all is coupled in the loop, it is little that device inserts loss, improved the utilization factor of pump light; By adopting 2 * 1 (or N * 1) multimode optical fiber wave multiplexer simple in structure, utilize its forward to close the little characteristic of ripple loss and realize that low-loss loop makes up and the loop of pump laser luminous power injects.
The present invention has the following advantages and good effect:
1. because the special construction of three port WDM, make and respectively adopt one three port WDM just can constitute the loop (multimode pigtail of two WDM is linked to each other) of a sealing at the doped gain fiber two ends, form pump light annular traveling wave structure, both avoided the waste of pump light, again filtering may enter the pump light of signal light path forward or backwards, played the effect of isolating.This method is that than the advantage of the loop configuration that adopts fiber coupler three port WDM device architectures are simple on the one hand, than the fiber coupler of single mode multimode mixed structure lower manufacture difficulty and cost is arranged; On the other hand, owing to adopt the optical filter of high reflectance to make residual pump light can all enter loop, the residual pump light utilization factor is higher; And the part pump light must be arranged with flashlight entering signal passage when adopting fiber coupler, and the loss of multi-module optical fiber coupler reverse transfer is bigger, thereby loop loss is bigger.
2. because employing has 2 * 1 multimode optical fiber wave multiplexers that close the ripple low loss characteristic, make when injecting the pumping laser power in the annular traveling wave structure and can not introduce bigger loss.
3. owing to adopt the circulation pumping configuration, pump light single transmission in gain fibre is absorbed when insufficient, can re-inject gain fibre by loop, make the pumping light power of gain fibre porch can surpass the output power of pump laser, absorb thereby strengthen, finally be issued to high absorptivity in latent attitude.Total output power that equals pump laser that absorbs deducts loop loss under the stable state, as long as loop loss is enough low, just can realize very high pump absorption rate, and the pump absorption rate of this circulation pumping configuration and gain fibre length are irrelevant, this makes the design of fiber amplifier more flexible.
4. adopt the multimode pumping light beam of WDM to go into and derive, reduced the manufacture difficulty of Primary Component in the high power cladding pumping fiber amplifier, reduced the cost of clad pumping optical fiber amplifier;
5. in reflection-type multimode/single mode mixing WDN device, adopt the doping double-cladding tail optical fiber of band surrounding layer, both solved the echo problems of pumping end, protected the multimode waveguide structure of doping double-cladding optical fiber again.
6. 2 * 1 multimode optical fiber wave multiplexers to close the loss of ripple direction very little, 2 * 1 multimode optical fiber wave multiplexers of cascade inject when also can be used for a plurality of pump laser; And 2 * 1 multimode optical fiber wave multiplexer manufacture crafts are simple more than the single mode multimode mixed structure fiber coupler wave multiplexer of (N * 1)+1.
Description of drawings
The circulation pumping multimode clad pumping optical fiber amplifier structure of the existing employing fiber coupler of Fig. 1 .1-.
Multimode optical fiber wave multiplexer structural representation among Fig. 1 .2-Fig. 1 .1.
Fig. 2-embodiment of the invention 1: the circulation pumping high power amplifier light channel structure synoptic diagram that adopts pump light reflection-type WDM device.
The fundamental diagram of reflection-type pumping WDM 2 among Fig. 3-Fig. 2.
Multimode among Fig. 4 .1-Fig. 3/single mode mixing twin-core collimating apparatus 7 optical fiber sectional views.
The single core collimating apparatus of standard single mode 8 optical fiber cross section structures among Fig. 4 .2-Fig. 3.
Fig. 5-embodiment of the invention 2: based on the circulation pumping high power amplifier light channel structure synoptic diagram of pump light transmission-type WDM device.
The fundamental diagram of transmission-type pumping WDM 3 among Fig. 6-Fig. 5.
Multimode among Fig. 7 .1-Fig. 6/single mode mixing twin-core collimating apparatus 16 optical fiber cross section structures 1.
Multimode among Fig. 7 .2-Fig. 6/single mode mixing twin-core collimating apparatus 16 optical fiber cross section structures 2.
The single core collimating apparatus of multimode 17 optical fiber cross section structures among Fig. 7 .3-Fig. 6.
Fig. 8 .1-2 * 1 multimode optical fiber wave multiplexer theory structure.
Fig. 8 .2-2 * 1 multimode optical fiber wave multiplexer strengthens the structure of closing weave efficiency.
Fig. 9-circulation pumping principle of work.
Figure 10-embodiment of the invention 3: backward pumping light channel structure synoptic diagram.
The circulation pumping high power amplifier of Figure 11-many pumps of employing.
Figure 12 .1-adopts the circulation pumping to optimize the application of the two-stage series connection image intensifer 1 of pump power distribution.
Figure 12 .2-adopts the circulation pumping to optimize the application of the two-stage series connection image intensifer 2 of pump power distribution.
Figure 12 .3-adopts the circulation pumping to optimize the application of the parallel-connection structure wide-band optical amplifier of pump power distribution.
Wherein:
The 1-doping double-cladding optical fiber;
1.1-doubly clad optical fiber protective seam; 1.2-doubly clad optical fiber surrounding layer; 1.3-doubly clad optical fiber inner cladding; 1.4-doubly clad optical fiber single mode waveguide (or fiber core with single-mold);
2-reflection-type pumping WDM;
3-transmission-type pumping WDM;
4-input end isolator;
5-output terminal isolator;
The 6-dielectric coating filter;
7-multimode/single mode mixing twin-core collimating apparatus;
7.1-twin-core fiber contact pin casing profile;
8-single mode list core collimating apparatus;
8.1-single-core fiber contact pin casing profile;
9-heavy in section multimode optical fiber;
9.1-multimode optical fiber covering; 9.2-multimode fibre core;
The 10-standard single-mode fiber;
10.1-single-mode fiber covering; 10.2-fiber core with single-mold;
The 11-pump light;
The 12-flashlight;
13-(N * 1)+1 multimode optical fiber wave multiplexer;
14-2 * 1 multimode optical fiber wave multiplexer;
15-single-mode fiber WDM;
16-multimode/single mode mixing twin-core collimating apparatus;
16.1-twin-core fiber contact pin casing profile;
The single core collimating apparatus of 17-multimode;
17.1-single-core fiber contact pin casing profile.
Embodiment
Main design philosophy of the present invention is:
1, will be in the present clad pumping optical fiber amplifier realize that pump light injects multimode/single mode the mixings WDN device replacement with three ports of multimode/single-mode fiber wave multiplexer (figure-1.1 devices 13) of adopting, realization is gone into and the separating of residual pump light by the multimode pumping light beam of WDM device.The clad pumping optical fiber amplifier optical texture of circulation pumping configuration is made up of doping double-cladding optical fiber 1, multimode/single mode mixing WDM 2 (or 3), I/ O optoisolator 4 and 5,2 * 1 multimode optical fiber wave multiplexers 14, I/O single-mode fiber 10 etc. shown in figure-2; Wherein constitute multimode pumping optical loop by WDM 2 (or 3)-doping double-cladding optical fiber 1-2 * 1 multimode optical fiber wave multiplexer 14-WDM2 (or 3); Pump light is injected in the pump light loop by multimode optical fiber 9 and 2 * 1 multimode optical fiber wave multiplexers 14.
2, the multimode of three ports/single mode mixing WDN device 2 is by multimode/single mode mixing twin-core collimating apparatus 7, and single core collimating apparatus 8 of standard single mode and dielectric filter sheet 6 three parts constitute.
3, the structure of multimode/single mode mixing twin-core collimating apparatus 7 fully taken into account the multimode pump light through the collimation lens back reflection to the multimode spot size of doping double-cladding optical fiber and the relation of optical fiber sectional dimension; for avoiding pump laser one end echo, take suitably to increase fibre core spacing from structure.Adopt the doping double-cladding optical fiber and the heavy in section multimode optical fiber (Φ 105/125um) of removing surrounding layer of band surrounding layer (Φ 250um) particularly, seen figure-3 and figure-4.1.Pump light is reflected by the dielectric filter sheet after the multimode optical fiber-GRIN Lens of heavy in section, enters the inner cladding of doping double-cladding optical fiber again after GRIN Lens, finishes injection.
4, in multimode/single mode mixing WDN device 3 structures (figure-6) of another three port, comprise doping double-cladding optical fiber and single-mode fiber in multimode/single mode mixing twin-core collimating apparatus 16, doping double-cladding optical fiber in multimode/single mode mixing twin-core collimating apparatus can keep surrounding layer and protective seam, also can only remain to inner cladding, but need to fill the space, see figure-7.3 with the surrounding layer medium; Comprise the heavy in section multimode optical fiber in the single core collimating apparatus 17 of multimode, after GRIN Lens-dielectric filter sheet-GRIN Lens, enter the inner cladding of doping double-cladding optical fiber in the multimode optical fiber of pump light from the single core collimating apparatus 17 of multimode, finish injection.Adopt the light channel structure of the clad pumping optical fiber amplifier employing figure-5 of this WDM device architecture.
5, the pump light that enters doping double-cladding optical fiber in transmission course with the dopant ion effect of fibre core, be partially absorbed, the other end at doubly clad optical fiber, remaining pump light is coupled in the multimode optical fiber through another WDM device, this multimode optical fiber is connected with the multimode input optical fibre of the WDM device of front by 2 * 1 multimode optical fiber wave multiplexers, 14 backs with the multimode optical fiber of pump laser output, finish the injection of loop and pump light, see figure-2,5,10,11.
6, consider the reason that pumping light power is bigger, the WDM designs becomes heat conduction encapsulating structure and adopt the good material of heat conduction efficiently.
7,2 * 1 multimode optical fiber wave multiplexers 14 have the unidirectional low-loss characteristic of ripple of closing.2 * 1 multimode optical fiber wave multiplexers are the check configuration of two input-lists output, have the ripple of closing low loss characteristic, multimode optical fiber technical specification: 105/125/250-0.22A.The pump light (pumping laser and residual pump light) that is injected into the pump light loop when needs is during more than two, can adopt more 2 * 1 multimode optical fiber wave multiplexers to realize that the pumping of many pump lights injects as required; Also can adopt N * 1 multimode optical fiber wave multiplexer, this many infusions are gone into the optical loss that does not additionally increase loop.
Further specify below in conjunction with drawings and Examples.
Fig. 1 .1 is a kind of structure of the cladding-pump fiber laser of announcing recently, in this structure, enter doping double-cladding optical fiber 1 behind the pump light process multimode optical fiber wave multiplexer 13, absorbed by the dopant ion in the single mode waveguide when in 1, transmitting, the other end of arrival 1 will remain the multimode pump light and collect in each multimode optical fiber behind another multimode optical fiber wave multiplexer 13, these pump lights enter gain fibre through first multimode optical fiber wave multiplexer 13 more then, finish recycling.This structure has the problem of two aspects, and the one, too complicated, device cost is very high, especially works as amplifier and need adopt the multilevel hierarchy pump light to divide timing, and device scale and cost all are difficult to accept; On the other hand; because the special construction (Fig. 1 .2) of the multimode optical fiber wave multiplexer that single mode and multimode are mixed; the covering that is used for the optical fiber of output signal light must carry the part pump light; in addition; the reverse transfer optical loss of multimode optical fiber wave multiplexer 13 is apparently higher than forward, and therefore this method can only collection unit be divided pumping residue light.
The structure of the embodiment of the invention 1 is as figure-2, two WDM devices 2 have been used at the two ends of double clad gain fibre 1, by a WDM device 2 pump light is injected in the optical fiber 1, at the other end of optical fiber 1 under the multimode optical fiber of another WDM device 2 is collected the unnecessary pump light of pump absorption not yet in effect, and, reach the effect of utilization once more by the photosynthetic ripple that one 2 * 1 multimode optical fiber wave multiplexer 14 will unnecessary pump light be exported with pump laser.
The structure of WDM device 2 and principle of work are seen figure-3, multimode/single mode mixing WDM device has adopted a multimode/single mode mixing twin-core collimating apparatus 7 that contains heavy in section multimode optical fiber 9 and doping double-cladding optical fiber 1, and will reflex to from the pump light 11 of heavy in section multimode optical fiber 9 in the covering of doping double-cladding optical fiber 1 by WDM dielectric filter 6, realize the injection of pump light, the numerical aperture of doping double-cladding optical fiber is not less than the numerical aperture (multimode optical fiber is generally 0.22) of heavy in section multimode optical fiber to guarantee sufficiently high coupling efficiency; The WDM dielectric filter is the high state that sees through to flashlight, and the flashlight 12 in the doping double-cladding optical fiber fiber core with single-mold arrives output (or input) single-mode fiber by twin-core collimating apparatus-dielectric filter-single mode single-core fiber collimator structure.Figure-4.1 and figure-4.2 are the cross section structure of twin-core in the WDM device 2 (figure-4.1) and single core (figure-4.2) collimating apparatus.
Figure-5 is embodiment 2: a kind of organization plan that adopts the circulation pumping high power amplifier of pump light transmittance structure WDM device.
Based on flashlight high anti-/ pumping sees through the principle of work of WDM device 3 of dielectric coating filter shown in figure-6; this structure multimode/single mode mixing WDM device is the single mode reflection; multimode transmission-type structure; the collimator sectional structure is as figure-7.1; wherein owing to there is not the pump light echo problems of reflection configuration, its twin-core collimating apparatus can adopt littler fibre core spacing from (figure-7.2).The advantage of this structure is, can adopt the special GRIN Lens that helps the coupling of multimode luminous power in single core collimating apparatus of injecting pump light, to improve the coupling efficiency of pump light.
The structure of 2 * 1 multimode optical fiber wave multiplexers 14 is seen figure-8.1, and it is very little that it closes the ripple loss, and this is the characteristics that the multimode wave multiplexer significantly is different from the single mode wave multiplexer, for reaching low-loss, when making 2 * 1 multimode optical fiber wave multiplexers, can suitably strengthen the sectional dimension of single fiber end, as figure-8.2.
Multimode wherein/single mode mixing WDM device has adopted a single-mode fiber-doping double-cladding optical fiber twin-core collimating apparatus, will reflex to from the flashlight 12 of single-mode fiber in the fibre core 1.4 of doping double-cladding optical fiber 1 by WDM dielectric filter 6; 6 pairs of pump lights of WDM dielectric filter see through fully, from the pump light 11 of heavy in section multimode optical fiber 9 by behind the WDM dielectric filter 6, incide in the covering of doping double-cladding optical fiber 1, the numerical aperture of doping double-cladding optical fiber 1 is not less than the numerical aperture (being generally 0.22) of heavy in section multimode optical fiber 9.
Figure-9 is the power transfer analysis under circulation pumping condition of the present invention.The luminous power of supposing pump laser output is P
0The absorptivity of pump light is η in optical fiber 1, and loop loss is δ P
0, reaching under the steady state conditions, be Δ P by the pump light that enters loop behind second WDM partial wave
0, the pumping light power that then is injected under the steady state conditions in the doping double-cladding optical fiber 1 should equal absorbed power and the residual pump light power sum that enters loop:
P
0+Δ·P
0-δ·P
0＝(P
0+Δ·P
0-δ·P
0)·η+Δ·P
0
Therefore have: (P
0+ Δ P
0-δ P
0) η=P
0-δ P
0(i)
If ignore loop loss, (P
0+ Δ P
0) η=P
0(ii)
(ii) the formula presentation of results is when ignoring loop loss, and power absorbed equals whole pumping laser output powers under the stable state, promptly reaches 100% absorption; The part of then changing when (i) the formula presentation of results is considered loop loss will be deducted loop loss, as long as loop loss is enough little, still can obtain higher conversion ratio, and for example during loop loss 1dB, conversion ratio also can reach more than 80%; Even loop loss 3dB also can reach 50% and absorb.Importantly, this circulation pump mode makes the absorption probability η of the capable ripple of pump light single become inessential, this has reduced the technological requirement for doped fiber on the one hand, also makes pump light absorptivity and fiber lengths irrelevant simultaneously, has increased the design flexibility of fiber amplifier.
Figure-10 is embodiment 3: a kind of organization plan of recycle back pumped high-power amplifier.
Figure-11 is a kind of organization plan that adopts the circulation pumping high power amplifier of double pump, realize the adding of second pump laser by increasing by one 2 * 1 multimode optical fiber wave multiplexer 14, therefore second 2 * 1 multimode optical fiber wave multiplexer of cause can't increase the loss of loop outside loop; According to said method the quantity of pump can also be increased to a plurality of to satisfy various requirement.
Figure 12 .1 and Figure 12 .2 are the application of the two-stage series connection image intensifer of employing WDM device optimization circulation pumping power division; Figure 12 .3 is the application of the parallel-connection structure wide-band optical amplifier of employing WDM device optimization circulation pumping power division.
Claims (5)
1, a kind of efficient circulating filling-in clad pumping optical fiber amplifier, it comprises input end isolator (4), serial connection standard single-mode fiber (10), WDN device (2), doubly clad optical fiber (1), WDN device (2), serial connection standard single-mode fiber (10), output terminal isolator (5) successively, with loop multimode optical fiber (9), 2 * 1 multimode optical fiber wave multiplexers (14) etc., it is characterized in that:
Be connected in series the multimode/single mode mixing WDN device (2) of three ports respectively in doubly clad optical fiber (1) front and back end; The multimode of front end/single mode mixing WDN device (2) is made of the single core collimating apparatus (8) of standard single mode, dielectric filter sheet (6) and multimode/single mode mixing twin-core collimating apparatus (7) three parts successively, the multimode of rear end/single mode mixing WDN device (2) is made of the single core collimating apparatus of multimode/single mode mixing twin-core collimating apparatus (7), dielectric filter sheet (6) and standard single mode (8) three parts successively, comprises doubly clad optical fiber (1) and heavy in section multimode optical fiber (9) in multimode/single mode mixing twin-core collimating apparatus (7);
Doubly clad optical fiber (1) and heavy in section multimode optical fiber (9) are finished multimode light by collimation lens and dielectric filter sheet (6) reflection and are connected, and the single-mode fiber (10) in the single core collimating apparatus of standard single mode (8) is finished single mode optics with dielectric filter sheet (6) with doubly clad optical fiber (1) through collimation lens and is connected;
The heavy in section multimode optical fiber (9) of the heavy in section multimode optical fiber (9) in the multimode of front end/single mode mixing twin-core collimating apparatus (7) and the multimode of rear end/single mode mixing twin-core collimating apparatus (7); connect by 2 * 1 multimode optical fiber wave multiplexers (14), another input end of 2 * 1 multimode optical fiber wave multiplexers (14) connects the pump laser output terminal.
2, a kind of efficient circulating filling-in clad pumping optical fiber amplifier, it comprises input end isolator (4), serial connection standard single-mode fiber (10), WDN device (2), doubly clad optical fiber (1), WDN device (2), serial connection standard single-mode fiber (10), output terminal isolator (5) successively, with loop multimode optical fiber (9), 2 * 1 multimode optical fiber wave multiplexers (14) etc., it is characterized in that:
Be connected in series the multimode/single mode mixing WDN device (3) of three ports respectively in doubly clad optical fiber (1) front and back end; The multimode of front end/single mode mixing WDN device (3) is made of the single core collimating apparatus (17) of multimode, dielectric filter sheet (6) and multimode/single mode mixing twin-core collimating apparatus (16) three parts successively; The multimode of rear end/single mode mixing WDN device (3) is made of the single core collimating apparatus of multimode/single mode mixing twin-core collimating apparatus (16), dielectric filter sheet (6) and multimode (17) three parts successively; Comprise doubly clad optical fiber (1) and standard single-mode fiber (10) in multimode/single mode mixing twin-core collimating apparatus (16), comprise multimode optical fiber (9) in the single core collimating apparatus of multimode (17).
Single-mode fiber (10) in doubly clad optical fiber (1) and the multimode/single mode mixing twin-core collimating apparatus (16) is finished single mode optics by collimation lens and dielectric filter sheet (6) reflection and is connected, and the heavy in section multimode optical fiber (9) in the single core collimating apparatus of multimode (17) is finished multimode optics with dielectric filter sheet (6) with doubly clad optical fiber (1) through collimation lens and is connected;
Heavy in section multimode optical fiber (9) in heavy in section multimode optical fiber (9) in the single core collimating apparatus of the multimode of front end (17) and the single core collimating apparatus of the multimode of rear end (17), connect by 2 * 1 multimode optical fiber wave multiplexers (14), another input end of 2 * 1 multimode optical fiber wave multiplexers (14) connects the pump laser output terminal.
3, efficient circulating filling-in clad pumping optical fiber amplifier as claimed in claim 1 is characterized in that:
2 * 1 multimode optical fiber wave multiplexers (14) are the check configuration of two input-lists output, and the heavy in section multimode optical fiber (9) of the output termination front end multimode/single mode mixing twin-core collimating apparatus (7) of (14) is finished the forward circulation pumping; Perhaps connect the heavy in section multimode optical fiber (9) in the multimode/single mode mixing twin-core collimating apparatus (7) of rear end, finish the recycle back pumping.
4, efficient circulating filling-in clad pumping optical fiber amplifier as claimed in claim 2 is characterized in that:
2 * 1 multimode optical fiber wave multiplexers (14) are the check configuration of two input-lists output, and the heavy in section multimode optical fiber (9) in the single core collimating apparatus of the multimode of the output termination front end of (14) (17) is finished the forward circulation pumping; Perhaps connect the heavy in section multimode optical fiber (9) in the single core collimating apparatus of multimode (17) of rear end, finish the recycle back pumping.
5, as claim 1 or 2 or 3 or 4 described efficient circulating filling-in clad pumping optical fiber amplifiers, it is characterized in that:, act on each inter-stage flexible allocation pumping light power by the pump light injection of WDM device or the ripple that closes of centrifugation and multimode 2 * 1 (or N * 1) optical fiber wave multiplexer with two-stage or multistage clad pumping optical fiber amplifier serial or parallel connection.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570269A (en) * | 2012-01-18 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Annular backward pumping structure of high-power all-fiber laser |
| CN103048737A (en) * | 2012-12-28 | 2013-04-17 | 清华大学 | Optical fiber beam splitter |
| CN107516811A (en) * | 2017-09-30 | 2017-12-26 | 清华大学 | Fiber amplifier and multi-stage fiber amplifier system |
| CN110556688A (en) * | 2019-09-28 | 2019-12-10 | 北京航空航天大学合肥创新研究院 | terahertz generation device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3092703B2 (en) * | 1998-01-14 | 2000-09-25 | 日本電気株式会社 | Bidirectional optical amplifier module |
| FR2791820B1 (en) * | 1999-03-29 | 2001-10-19 | Cit Alcatel | SINGLE-BAND OPTICAL FIBER AMPLIFIER |
| KR100415548B1 (en) * | 2001-08-16 | 2004-01-24 | 한국전자통신연구원 | Long-wavelength-band erbium-doped fiber amplifier |
| JP4310971B2 (en) * | 2002-06-18 | 2009-08-12 | 日本電気株式会社 | Optical fiber amplifier |
| CN1240166C (en) * | 2003-06-04 | 2006-02-01 | 清华大学 | All optical fibre adjustable width continuous spectrum laser pump source for superflat wide-band Raman amplification |
| CN1750334A (en) * | 2005-09-09 | 2006-03-22 | 南开大学 | Composite chamber adjustable Raman optical fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102570269A (en) * | 2012-01-18 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Annular backward pumping structure of high-power all-fiber laser |
| CN103048737A (en) * | 2012-12-28 | 2013-04-17 | 清华大学 | Optical fiber beam splitter |
| CN107516811A (en) * | 2017-09-30 | 2017-12-26 | 清华大学 | Fiber amplifier and multi-stage fiber amplifier system |
| CN110556688A (en) * | 2019-09-28 | 2019-12-10 | 北京航空航天大学合肥创新研究院 | terahertz generation device |
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