CN1815338A - Broadband optical fiber amplifier - Google Patents
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- CN1815338A CN1815338A CN 200510033192 CN200510033192A CN1815338A CN 1815338 A CN1815338 A CN 1815338A CN 200510033192 CN200510033192 CN 200510033192 CN 200510033192 A CN200510033192 A CN 200510033192A CN 1815338 A CN1815338 A CN 1815338A
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Abstract
The optical fiber amplifier includes first amplification (Amp) module and second Amp module. Characters are that filtering module is cascaded between output end of first Amp module and input end of the second Amp module; input end of first Amp module is connected to circulator, and output end of second Amp module is connected to a reflection module; the filtering module generates actions of reflection and transmission respectively for signal lights in shot wavelength band and long wavelength band; reflection module reflects signal light in long wavelength band; a port of the circulator is connected to the input end of the first Amp module; other two ports of the circulator are use for receiving and outputting signal light; first Amp module is in use for magnifying powers of signal in shot wavelength band and long wavelength band, and second Amp module is in use for magnifying power of signal in long wavelength band. Features are: simple structure, low cost, high efficiency.
Description
Technical field
The present invention relates to optics, relate in particular to a kind of broadband optical fiber amplifier.
Background technology
Wavelength-division multiplex technique is meant the communication technology of the light signal of a plurality of wavelength of transmission in same optical fiber, wavelength division multiplexing communications systems typical structure synoptic diagram as shown in Figure 1, transmitter module TX1, TX2, TX3 ... it is λ 1 that TXn sends wavelength respectively, λ 2, λ 3 ... the flashlight of λ n, the flashlight of different wave length is coupled in the same optical fiber through a wavelength division multiplexer to be propagated, flashlight is input in the fiber amplifier then, signal light power is exaggerated lifting, flashlight is exaggerated the back and propagates in Transmission Fibers, because Transmission Fibers has loss characteristic, the flashlight of propagating in Transmission Fibers is by attenuation reduction gradually, flashlight amplifies through the next stage fiber amplifier more then, by that analogy, through multistage transmission and amplification, last flashlight is input in another wavelength division multiplexer, this wavelength division multiplexer is with different wave length λ 1, λ 2, λ 3 ... the flashlight of λ n separates and is sent to different output terminals, is received module RX1 respectively, RX2, RX3 ... RXn receives.
Fiber amplifier is mainly used to the amplifying signal luminous power at wave division multiplexing transmission system, and the compensated line loss plays relaying action.The most frequently used fiber amplifier is a rare earth-doped fiber amplifier in the wavelength-division multiplex system, and its basic functional principle is that the stimulated radiation of light is amplified.Advantages such as it is wide that Erbium-Doped Fiber Amplifier (EDFA) has gain bandwidth (GB), and polarization is uncorrelated, noise figure is low, and (during 1525nm～1565nm), the lowest loss window of corresponding optical fiber has obtained widespread use to be operated in C-band.By adjusting Er-doped fiber length and control pump power, gain of EDFA spectrum can be transferred to L-band (1570nm～1610nm), L-band also is positioned near the optical fiber lowest loss window, and the L-band Erbium-Doped Fiber Amplifier (EDFA) also obtains using more widely.
Along with the optical communication system data quantity transmitted increases day by day, the transmission bandwidth that increases optical-fiber network becomes in the practical application must not irrespective factor, in view of this application demand, the signal wavelength of wave division multiplexing transmission system transmission is more and more, the bandwidth of operation that is applied to fiber amplifier wherein is also more and more wideer, C+L wave band Erbium-Doped Fiber Amplifier (EDFA) occurred.
As shown in Figure 2, existing C+L-band Erbium-Doped Fiber Amplifier (EDFA) is by i.e. first amplification module 2 of the Erbium-Doped Fiber Amplifier (EDFA) of a C-band, with i.e. second amplification module 3 of the Erbium-Doped Fiber Amplifier (EDFA) of a L-band, cooperate C/L wavelength division multiplexer 1 formation in parallel, it comprises two C/L wavelength division multiplexers 1, one first amplification module 2 and second amplification module 3, first amplification module 2 and second amplification module 3 are connected to respectively between two C/L wavelength division multiplexers 1, its inner formation as shown in Figure 3, respectively comprise one section Er-doped fiber in first amplification module 2 and second amplification module 3, a pump laser and a pump light wave multiplexer, and input and output position therein respectively connects an optoisolator, flatness for gain spectral has strict demand, then gain flattening filter of polyphone behind isolator.
As shown in Figure 3, flashlight is imported from input end, then through being divided into C-band flashlight and L-band two paths of signals light behind C/L wavelength division multiplexer 1 demultiplexing, C-band flashlight and L-band flashlight are exaggerated through first amplification module 2 and second amplification module 3 respectively then, and C-band after will amplifying through a C/L wavelength division multiplexer more at last and L-band flashlight merge in the optical fiber of same road to be exported.
This light channel structure of existing C+L band optical fiber amplifier has determined necessary use two cover optical devices, optical device uses manyly more, and the amplifier cost is just high more, and the optical device that uses is many more, therefore process complicatedly more, the C+L band optical fiber amplifier manufacturing cost of this structure is higher; In addition, each optical passive component all has the loss effect, use a large amount of optical passive components to increase the insertion loss, and this parallel-connection structure impels the increase of welding point, each welding point also all can be lossy, influences the output power and the pump power transformation efficiency of amplifier.
Summary of the invention
The object of the present invention is to provide a kind of broadband optical fiber amplifier, can be used for S-band and long wave segment signal simultaneously and amplify, it is simple in structure, and cost is low, and the efficient height is to solve the problems of the prior art.
The technical solution adopted in the present invention is, this broadband optical fiber amplifier, comprise first amplification module and second amplification module, it is characterized in that: the filtration module of contacting between the described first amplification module output terminal and the second amplification module input end, the input end of described first amplification module connects circulator, the output terminal of described second amplification module connects reflecting module, described filtration module produces reflection and transmission respectively to S-band and L-band flashlight, described reflecting module produces reflection to the L-band flashlight, a port of described circulator links to each other with the first amplification module input end, and two other port of circulator receives respectively and output signal light;
Described first amplification module is used to amplify S-band and L-band signal power, and described second amplification module is used for amplification long-wave long-wave band signal power, and described S-band refers to C-band, and described L-band refers to L-band;
Described first amplification module and second amplification module are Erbium-Doped Fiber Amplifier (EDFA);
Er-doped fiber is by fully pumping in described first amplification module, and number average particle counter-rotating rate level is higher than 55%, not fully pumping of Er-doped fiber in described second amplification module, and number average particle counter-rotating rate level is lower than 40%;
Described second amplification module equals first amplification module poor to C-band and L-band signal gain to the gain of L-band signal;
Described filtration module is a Fiber Bragg Grating FBG type filtering unit, or is optically thin membranous type filtering unit;
Described filtration module comprises C/L wavelength division multiplexer and catoptron, the input end of described C/L wavelength division multiplexer links to each other with the output terminal of first amplification module, described C/L wavelength division multiplexer has C-band output terminal and L-band output terminal, wherein, the C-band output terminal links to each other with catoptron, and the L-band output terminal is connected to the input end of second amplification module;
Described filtration module comprises C/L wavelength division multiplexer and circulator, the input end of described C/L wavelength division multiplexer links to each other with the output terminal of first amplification module, described C/L wavelength division multiplexer has C-band output terminal and L-band output terminal, wherein, the C-band output terminal links to each other with circulator port 2, and circulator port 3 is connected with port one; The L-band output terminal is connected to the input end of second amplification module;
Described filtration module is relevant with wavelength to the reflectivity of C-band flashlight and L-band flashlight, and C-band flashlight and L-band flashlight are played the flat gain filter action;
Described reflecting module is a catoptron; Perhaps be circulator, described circulator port 2 links to each other with the output terminal of second amplification module, and described circulator port 3 is connected with port one;
Described reflecting module is 2 * 2 shunts, and described shunt port 2 is connected with port 3, and the shunt port one links to each other with the output terminal of second amplification module, shunt port one and port 4 equal output signal light;
Described reflecting module is relevant with wavelength to the reflectivity of L-band flashlight, and the L-band flashlight is played the flat gain filter action;
Described first amplification module is used to amplify S-band and L-band signal power, described second amplification module is used for amplification long-wave long-wave band signal power, described S-band refers to S-band, described L-band refers to the S+ wave band, and described first amplification module and second amplification module are thulium doped fiber amplifier.
Beneficial effect of the present invention is, in the present invention, the reflection and the transmission effect that S-band and L-band flashlight are produced by filtration module, and reflecting module is to the reflection of long wave segment signal, twice of S-band signal is through the rare earth doped fiber in first amplification module, twice of long wave segment signal is through the rare earth doped fiber in first amplification module and second amplification module, the present invention is under the prerequisite that does not increase rare earth doped fiber length, increased the light path of flashlight in rare earth doped fiber, since gain and flashlight the light path of rare earth doped fiber of process be directly proportional, therefore signal has obtained being equivalent to the amplification of twice rare earth doped fiber length, obviously, with respect to prior art, for realizing identical gain, rare earth doped fiber length has been saved half in the present invention, greatly reduce cost, this series arrangement of the present invention is simple, optical device is few, and the final output of flashlight do not use wavelength division multiplexer, but is directly exported by circulator, reduced output loss, improved the pump power transformation efficiency, therefore, the present invention is simple in structure, cost is low, the efficient height.
In the present invention, by the control pump power, make the abundant pumping of the first amplification module middle rare earth optical fiber that is in prime, keep higher population inversion rate level, to the not fully pumping of the second amplification module middle rare earth optical fiber that is in the back level, adopt Erbium-Doped Fiber Amplifier (EDFA) as first amplification module and second amplification module, the shape of gain spectral mainly is subjected to the influence of number average particle counter-rotating rate, as shown in Figure 4, (1525nm～1565nm) and long wavelength's L-band are (for the signal of 1570nm～1610nm) for short wavelength's C-band, when the population inversion rate increases, the increase of C-band gain is more more remarkable than the increase of L-band, for the C-band signal, usually number average particle counter-rotating rate is relatively smooth 60%～70% o'clock gain spectral, for the L-band signal, usually number average particle counter-rotating rate gain spectral when 35% left and right sides is relatively smooth, in the present invention, by pump power control to first amplification module and second amplification module, make on the whole, the C-band flashlight total number average particle counter-rotating rate of Er-doped fiber of process be in the more smooth level of C ripple gain coefficient, the L-band flashlight total number average particle counter-rotating rate of Er-doped fiber of process be in the more smooth level of L ripple gain coefficient, thereby make the present invention make C-band signal and L-band signal all reach more smooth gain spectral on the whole.
Because the C-band gain coefficient is higher than the gain coefficient of L-band far away, therefore first amplification module gains much larger than the L-band flashlight is gained to the C-band flashlight; By controlling the pump power in second amplification module, make in second amplification module Er-doped fiber keep lower population inversion rate level, second amplification module only amplifies the L-band flashlight, in the present invention, second amplification module equals first amplification module poor to C-band and L-band signal gain to the gain of L-band signal, just can realize C-band signal and the identical effect of L-band signal overall gain, select from technology, only to include choosing of related parameter for this control of second amplification module and first amplification module.
By above analysis as can be known, among the present invention for guaranteeing to C-band and L-band flat gain and signal equal gain, the technology of the present invention realizes having inherent consistance, promptly by the control pump power, make the first amplification module population inversion rate keep higher level, make the second amplification module population inversion rate keep reduced levels, thereby obtain more smooth on the whole gain spectral, therefore, the present invention is practical.
Filtration module is relevant with wavelength in the transmissivity of the reflectivity of C-band and L-band, C-band flashlight and L-band flashlight are played the flat gain filter action, and reflecting module is relevant with wavelength at the reflectivity of L-band, the L-band flashlight is played the flat gain filter action, then be equivalent at filtration module and reflecting module integration gain flat filter, further improve flat gain of the present invention, simultaneously, because this flat gain filter action point is for C-band and L-band, all be in Er-doped fiber light path middle part, with respect to prior art, gain flattening filter places near the output terminal, flat gain filtering is less to the energy loss of flashlight among the present invention, further improves the pump power transformation efficiency.
Description of drawings
Fig. 1 is a wavelength division multiplexing communications systems typical structure synoptic diagram in the prior art;
Fig. 2 is existing C+L band optical fiber amplifier general illustration;
Fig. 3 constitutes synoptic diagram for existing C+L band optical fiber amplifier is inner;
Fig. 4 is gain coefficient spectral line, wavelength and population inversion rate corresponding relation synoptic diagram;
Fig. 5 is a general structure synoptic diagram of the present invention;
Fig. 6 compares synoptic diagram for the gain spectral of the present invention and prior art;
Fig. 7 is a filtration module application examples synoptic diagram of the present invention;
Fig. 8 is a filtration module application examples synoptic diagram of the present invention;
Fig. 9 is a filtration module application examples synoptic diagram of the present invention;
Figure 10 is a filtration module application examples synoptic diagram of the present invention;
Figure 11 is a reflecting module application examples synoptic diagram of the present invention;
Figure 12 is a reflecting module application examples synoptic diagram of the present invention;
Figure 13 is a reflecting module application examples synoptic diagram of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
According to Fig. 5, the present invention includes first amplification module 2 and second amplification module, 3, the first amplification modules 2 are used to amplify S-band and L-band signal power; Second amplification module 3 is used for amplification long-wave long-wave band signal power, and for present embodiment, particularly, S-band can refer to C-band, and L-band can refer to L-band.
As shown in Figure 5, the input end of polyphone filtration module 4, the first amplification modules 2 connects circulator 6 between first amplification module, 2 output terminals and second amplification module, 3 input ends, and circulator 6 ports 2 link to each other with first amplification module, 2 input ends; Two other port of circulator 6 receives respectively and output signal light, the input of circulator 6 port one received signal light, circulator 6 ports 3 output signal light; The output terminal of second amplification module 3 connects reflecting module 5, and 4 pairs of C-bands of filtration module and L-band flashlight produce reflection and transmission respectively, and 5 pairs of L-band flashlights of reflecting module produce reflection.
As shown in Figure 5, first amplification module 2 and second amplification module 3 are Erbium-Doped Fiber Amplifier (EDFA), comprise pump laser, wavelength division multiplexer and Er-doped fiber, wherein, Er-doped fiber is by fully pumping in first amplification module 2, and number average particle counter-rotating rate level is higher than 55%; Not fully pumping of Er-doped fiber in second amplification module 3, number average particle counter-rotating rate level is lower than 40%.
In the present invention, filtration module 4 comprises C/L wavelength division multiplexer 31 and catoptron 32, as shown in Figure 9, the input end of C/L wavelength division multiplexer 31 links to each other with the output terminal of first amplification module 2, C/L wavelength division multiplexer 31 has C-band output terminal and L-band output terminal, and wherein, the C-band output terminal links to each other with catoptron 32, the L-band output terminal is connected to the input end of second amplification module 3, and this filtration module 4 can reflect the remnant pump light of first amplification module 2 and second amplification module 3.
As shown in figure 11, reflecting module 5 adopts catoptron 51, and catoptron 51 can adopt optical thin film, fiber grating, metal-coated membrane or total reflection project organization, can reflect the remnant pump light of the L-band flashlight and second amplification module 3 simultaneously.
As shown in Figure 5, the flashlight of C-band and L-band is imported from circulator 6 port ones, from 2 outputs of circulator 6 ports, enter into the fully pumping of Er-doped fiber quilt in first amplification module, 2, the first amplification modules then, population inversion rate level is higher, as 60%～70%, the flashlight of C-band and L-band all obtains amplifying in first amplification module 2, and from 2 outputs of first amplification module, enters into filtration module 4.
As shown in Figure 5, catoptron 32 in the filtration module 4 reflects the flashlight of C-band, the flashlight of C-band enters first amplification module 2 by C/L wavelength division multiplexer 31 once more, in first amplification module 2, continue to be exaggerated, enter into circulator 6 ports 2 then, and from 3 outputs of circulator 6 ports; Simultaneously, the flashlight of L-band then enters into second amplification module 3 by the C/L wavelength division multiplexer 31 in the filtration module 4, second amplification module 3 is kept lower number average particle counter-rotating rate level, as 35%, the L-band flashlight that enters second amplification module 3 is continued to be amplified, export reflecting module 5 then to, reflecting module 5, be that catoptron 51 is with in flashlight reflected back second amplification module 3, the L-band flashlight is amplified by second amplification module 3 once more, and then through filtration module 4, enters into first amplification module 2 once more and continued to amplify, be input to circulator 6 ports 2 then, finally also from 3 outputs of circulator 6 ports.
Wherein: the light path of C-band flashlight is:
Circulator 6 port ones → circulator 6 ports 2 → the first amplification modules 2 →
The light path of L-band flashlight is:
Circulator 6 port ones → circulator 6 ports 2 → the first amplification modules 2 →
This shows, the C-band flashlight is amplified twice by first amplification module 2, the L-band flashlight is respectively amplified twice by first amplification module 2 and second amplification module 3, the present invention is under the prerequisite of certain Er-doped fiber length, C-band and L-band flashlight have all obtained the light path of the corresponding Er-doped fiber length of twice, that is, the light path of C-band flashlight is: the twice of Er-doped fiber length in first amplification module 2; The light path of L-band flashlight is: the twice of Er-doped fiber length sum in first amplification module 2 and second amplification module 3.
In first amplification module 2, population inversion rate level is higher, and is relatively smooth for C-band signal gain spectrum; In second amplification module 3, population inversion rate level is lower, and is relatively smooth for L-band signal gain spectrum; Thereby the present invention makes C-band signal and L-band signal reach more smooth gain spectral on the whole.
The gain of 3 pairs of L-band signals of second amplification module equals the poor of 2 pairs of C-bands of first amplification module and L-band signal gain, and like this, the present invention just realizes C-band signal and the identical effect of L-band signal overall gain.
In the present invention, filtration module 4 can be relevant with wavelength to the reflectivity of C-band flashlight, the C-band flashlight is played the flat gain filter action, light path as above-mentioned C-band flashlight illustrates as can be known, this flat gain filter action point is in Er-doped fiber light path middle part, and the Er-doped fiber of first amplification module 2 is respectively arranged before and after this application point; Reflecting module is relevant with wavelength to the reflectivity of L-band flashlight, the L-band flashlight is played the flat gain filter action, equally, this flat gain filter action point is in Er-doped fiber light path middle part, and first amplification module 2 of polyphone and the Er-doped fiber of second amplification module 3 are respectively arranged before and after this application point.
The present invention as shown in table 1 and prior art main performance and relevant parameter comparison table.
Wherein, the prior art light channel structure as shown in Figure 3.
| The present invention | Prior art | |
| Bandwidth of operation | ?1529nm～1561nm& ?1572nm～1604nm | ?1529nm～1561nm& ?1572nm～1604nm |
| Channel number | 80 (C, each 40 ripple of L-band distribute according to the 100GHz wavelength interval) | 80 (C, each 40 ripple of L-band distribute according to the 100GHz wavelength interval) |
| Single ripple power input | ?-20dBm | ?-20dBm |
| Gain | ?＞24dB | ?＞24dB |
| Gross output | ?23.58dBm | ?23.42dBm |
| The fine length of the first amplification module erbium | 6 meters | 13.3 rice |
| The fine length of the second amplification module erbium | 38.7 rice | 97 meters |
| The fine total length of erbium | 44.7 rice | 110.3 rice |
| The first amplification module pump power | ?450mW@980nm | ?380mW@980nm |
| The second amplification module pump power | ?50mW@1480nm | ?520mW@1480nm |
| Total pump power | ?500mW | ?900mW |
| The pump power transformation efficiency | ?45.6％ | ?24.4％ |
| The passive device number | ?6 | ?10 |
| The pump laser number | ?2 | ?2 |
Table 1
The present invention as shown in Figure 6 and the gain spectral of prior art be synoptic diagram relatively, wherein, the curve that is conspired to create by " * " is a gain spectral of the present invention, the curve that is conspired to create by " ◇ " is the gain spectral of prior art, and with both contrasts as can be known, both gains are all greater than 24dB, gain flatness is all less than 1dB, according to table 1 as can be seen, same signal light is realized identical gain, the present invention is than the Er-doped fiber consumption of prior art saving 59% and 44% pump power; Pump power transformation efficiency of the present invention is 1.85 times of prior art approximately; The present invention lacks than prior art and has used 4 optical passive components.
In a word, for realizing identical functions, light channel structure of the present invention is simpler, and Er-doped fiber length is shorter, and pump power is lower, optical passive component still less, the pump power transformation efficiency is higher.
In the present invention, filtration module 4 can adopt other application structure:
For example, filtration module 4 can adopt the stand-alone assembly of Fiber Bragg Grating technology and optical film technique to realize, as shown in Figure 7, filtration module 4 adopts Fiber Bragg Grating FBG type filtering unit 11; Or as shown in Figure 8, filtration module 4 adopts optically thin membranous type filtering unit 21.
Its concrete course of work is as follows: as shown in figure 10, the C-band and the L-band flashlight of 2 outputs of first amplification module are input to C/L wavelength division multiplexer 41, the flashlight of C-band and L-band is separated then, and C-band output terminal and the L-band output terminal C from C/L wavelength division multiplexer 41 exports respectively.
As shown in figure 10, the L-band flashlight is input in second amplification module 3; L-band flashlight process C/L wavelength division multiplexer 41 by second amplification module 3 returns enters in first amplification module 2.
As shown in figure 10, the C-band flashlight is input to circulator 42 ports 2, transfer to circulator 42 ports 3 then, because circulator 42 ports 3 are connected with port one, therefore, the C-band flashlight is transported to circulator 42 port ones, is returned by circulator 42 ports 2 and exports C/L wavelength division multiplexer 41 to, enters once more in first amplification module 2 through C/L wavelength division multiplexer 41.
Reflecting module 5 also can adopt other application structure:
For example, as shown in figure 12, reflecting module 5 adopts circulator 61, and circulator 61 ports 2 link to each other with the output terminal of second amplification module 3, and circulator 61 ports 3 are connected with port one.
Its concrete course of work is as follows: as shown in figure 12, flashlight and pump light by 3 outputs of second amplification module are imported from circulator 61 ports 2, be back to port 2 through circulator 61 ports 3, port one successively then, flashlight and pump light turn back to second amplification module 3 again.
As shown in figure 13, reflecting module 5 adopts 2 * 2 shunts 71, and described shunt 71 ports 2 are connected with port 3, and shunt 71 port ones link to each other with the output terminal of second amplification module 3, shunt port one and port 4 equal output signal light.
Its concrete course of work is as follows: as shown in figure 13, flashlight and pump light by 3 outputs of second amplification module are input to shunt 71 port ones, through being divided into two-way behind the shunt 71 respectively from port 2 and port 3 outputs, be input to shunt 71 ports 3 and port 2 then respectively, export from port one and port 4 through shunt 71 again, wherein, flashlight in the port one and pump light turn back in second amplification module 3, the flashlight and the pump light of port 4 outputs then are depleted, and adopt this kind application structure can produce the loss of 3dB.
The above for example understands other application structure of filtration module 4 and reflecting module 5, and structure of other parts, principle and the course of work and noted earlier same or similar repeat no more herein when being applied in whole optical path as for it.
The above for example understands structure, principle and the course of work of C+L wave band Erbium-Doped Fiber Amplifier (EDFA), adopt similar structure, principle and the course of work, first amplification module and second amplification module adopt thulium doped fiber amplifier, can realize for S-band, (1450nm～1480nm) and L-band, (1480nm～1510nm) amplifies in the time of signal as the S+ wave band as S-band.
Claims (13)
1. broadband optical fiber amplifier, comprise first amplification module and second amplification module, it is characterized in that: the filtration module of contacting between the described first amplification module output terminal and the second amplification module input end, the input end of described first amplification module connects circulator, the output terminal of described second amplification module connects reflecting module, described filtration module produces reflection and transmission respectively to S-band and L-band flashlight, described reflecting module produces reflection to the L-band flashlight, a port of described circulator links to each other with the first amplification module input end, and two other port of circulator receives respectively and output signal light.
2. broadband optical fiber amplifier according to claim 1, it is characterized in that: described first amplification module is used to amplify S-band and L-band signal power, described second amplification module is used for amplification long-wave long-wave band signal power, described S-band refers to C-band, and described L-band refers to L-band.
3. broadband optical fiber amplifier according to claim 1 is characterized in that: described first amplification module and second amplification module are Erbium-Doped Fiber Amplifier (EDFA).
4. broadband optical fiber amplifier according to claim 3 is characterized in that: Er-doped fiber is by fully pumping in described first amplification module, and number average particle counter-rotating rate level is higher than 55%; Not fully pumping of Er-doped fiber in described second amplification module, number average particle counter-rotating rate level is lower than 40%.
5. according to claim 1 or 2 or 3 or 4 described broadband optical fiber amplifiers, it is characterized in that: described second amplification module equals first amplification module poor to C-band and L-band signal gain to the gain of L-band signal.
6. broadband optical fiber amplifier according to claim 1 and 2 is characterized in that: described filtration module is a Fiber Bragg Grating FBG type filtering unit, or is optically thin membranous type filtering unit.
7. broadband optical fiber amplifier according to claim 1 and 2, it is characterized in that: described filtration module comprises C/L wavelength division multiplexer and catoptron, the input end of described C/L wavelength division multiplexer links to each other with the output terminal of first amplification module, described C/L wavelength division multiplexer has C-band output terminal and L-band output terminal, wherein, the C-band output terminal links to each other with catoptron, and the L-band output terminal is connected to the input end of second amplification module.
8. broadband optical fiber amplifier according to claim 1 and 2, it is characterized in that: described filtration module comprises C/L wavelength division multiplexer and circulator, the input end of described C/L wavelength division multiplexer links to each other with the output terminal of first amplification module, described C/L wavelength division multiplexer has C-band output terminal and L-band output terminal, wherein, the C-band output terminal links to each other with circulator port 2, and circulator port 3 is connected with port one; The L-band output terminal is connected to the input end of second amplification module.
9. broadband optical fiber amplifier according to claim 1 and 2 is characterized in that: described filtration module is relevant with wavelength to the reflectivity of C-band flashlight and L-band flashlight, and C-band flashlight and L-band flashlight are played the flat gain filter action.
10. broadband optical fiber amplifier according to claim 1 and 2 is characterized in that: described reflecting module is a catoptron; Perhaps be circulator, described circulator port 2 links to each other with the output terminal of second amplification module, and described circulator port 3 is connected with port one.
11. broadband optical fiber amplifier according to claim 1 and 2, it is characterized in that: described reflecting module is 2 * 2 shunts, described shunt port 2 is connected with port 3, and the shunt port one links to each other with the output terminal of second amplification module, shunt port one and port 4 equal output signal light.
12. broadband optical fiber amplifier according to claim 1 and 2 is characterized in that: described reflecting module is relevant with wavelength to the reflectivity of L-band flashlight, and the L-band flashlight is played the flat gain filter action.
13. broadband optical fiber amplifier according to claim 1, it is characterized in that: described first amplification module is used to amplify S-band and L-band signal power, described second amplification module is used for amplification long-wave long-wave band signal power, described S-band refers to S-band, described L-band refers to the S+ wave band, and described first amplification module and second amplification module are thulium doped fiber amplifier.
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| CN106654827A (en) * | 2016-11-03 | 2017-05-10 | 北京信息科技大学 | Realization method of (C+L)-wave-band ASE light source based on double pumping sources |
| CN110176711A (en) * | 2019-06-14 | 2019-08-27 | 杭州电子科技大学 | A kind of S-band, C-band, L-band erbium-doped fiber amplifier |
| WO2020062139A1 (en) * | 2018-09-29 | 2020-04-02 | 华为技术有限公司 | Optical terminal multiplexer, control method, and wavelength division multiplexing system |
| WO2022068676A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Optical fiber amplification apparatus |
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2005
- 2005-02-04 CN CN 200510033192 patent/CN1815338A/en active Pending
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| CN103477514A (en) * | 2011-04-14 | 2013-12-25 | 阿尔卡特朗讯 | Polarization stabilization scheme for un-cooled self-tuning cavity for colorless ultra broadband PON |
| WO2015127575A1 (en) * | 2014-02-26 | 2015-09-03 | 上海交通大学 | Fully optically controlled phased array radar transmitter |
| US9689968B2 (en) | 2014-02-26 | 2017-06-27 | Shanghai Jiao Tong University | Wholly optically controlled phased array radar transmitter |
| CN106654827A (en) * | 2016-11-03 | 2017-05-10 | 北京信息科技大学 | Realization method of (C+L)-wave-band ASE light source based on double pumping sources |
| CN106654827B (en) * | 2016-11-03 | 2019-09-06 | 北京信息科技大学 | A kind of implementation method of the achievable C+L wave band ASE light source based on double pumping action |
| WO2020062139A1 (en) * | 2018-09-29 | 2020-04-02 | 华为技术有限公司 | Optical terminal multiplexer, control method, and wavelength division multiplexing system |
| CN110176711A (en) * | 2019-06-14 | 2019-08-27 | 杭州电子科技大学 | A kind of S-band, C-band, L-band erbium-doped fiber amplifier |
| CN110176711B (en) * | 2019-06-14 | 2020-04-24 | 杭州电子科技大学 | Erbium-doped optical fiber amplifier with S wave band, C wave band and L wave band |
| WO2022068676A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Optical fiber amplification apparatus |
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