CN207009890U - Combine raman pump source and raman amplifier - Google Patents
Combine raman pump source and raman amplifier Download PDFInfo
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Abstract
The utility model provides a kind of combination raman pump source, including one or more 1 rank raman pump sources, the one or more N ranks raman pump sources of one or more 2 rank raman pump sources ..., N >=2, and a broadband wave multiplexer；The output end of each raman pump source connects each input of broadband wave multiplexer respectively；1 rank raman pump source uses non-coherent broad band light source, and 2 ranks and 2 rank above raman pump sources use coherent laser light source；Input signal optical spectrum is located at the N rank Raman frequency shifts of N rank coherent laser light source frequency spectrums, N >=2, meanwhile, input signal optical spectrum is located at 1 rank Raman frequency shift of 1 rank non-coherent broad band light source frequency spectrum.The utility model at least realizes broadband flat-high-gain spectrum only with two light source cans, reduces cost, and is suitably applied the raman amplifier of a variety of pump modes, is particularly suitable for the raman amplifier of Pumped mode.
Description
Technical field
A kind of optical transmission device is the utility model is related to, especially a kind of raman pump source.
Background technology
Raman amplifier obtains more and more extensive application in recent years.Raman amplifier is to utilize stimulated Raman scattering phenomenon
The image intensifer of realization.One high-power pump light and the flashlight of a low-power are directed in same Transmission Fibers,
Energy from high-power pump light is transferred in the flashlight of low-power, and this completes the amplification of flashlight；
In typical case, the wavelength of high power pump light is less than the wavelength of low-power signal light, and both differences are designed to be approximately equal to
The Stokes transfer of transmission medium；Pump light and input signal light can use symport or reverse transfer structure to enter biography
Fibre is lost, that is, corresponds respectively to the mode of Pumped and backward pumping.
Raman amplifiction typically uses backward pumping mode, that is, pump light to enter gain fibre from receiving terminal, and it is transmitted
Direction with signal optical transmission direction on the contrary, this pump mode is using commonplace because pump light and flashlight reverse transfer,
The effect that many pumping amplifications at different moments accumulate during total amplification effect in terms of signal angle, so can be effectively smooth relative
Intensity noise and the signal cross-talk using pumping as medium；It is not in addition very high in the power of amplification region signal, pumping is exhausted
Act on it is smaller, can also reduce above-mentioned noise and interference influence.
And Pumped, pump light enter optical fiber from transmitting terminal together with flashlight, due to flashlight have to pumping it is very strong
Depletion action, so the fluctuation of total power signal will cause the increase of pumping relative intensity noise, in turn, pumping it is relative
Intensity noise can be transferred on flashlight again, form the signal cross-talk using pumping as medium；Document shows, in order to ensure that Q values are damaged
Wound is no more than 0.5dB, and for True-wave optical fiber, Raman gain must not exceed 6dB, and to SMF raman gain fibers then not
Allow to be more than 10dB；
At present frequently with pumping source have two kinds of the semiconductor laser group or optical fiber laser of multiplexing.Semiconductor laser
Device belongs to coherent source, has wavelength monochromaticjty good（Band width）, good directionality, the features such as coherence is good.Due to partly leading
The ripe development of body technique, commercial semiconductor lasers maximum can reach 500mW.Raman amplifier is typically using multiple
The method of polarization of semiconductor laser multiplexing forms raman pump source, eliminates and correlation is polarized caused by pumping polarization state difference
Gain.
The gain bandwidth of raman amplifier can be by selecting pumping source come flexible configuration, and uses multi wavelength pumping source
Broadband flat gain characteristic can also be realized.Such as to obtain 1dB flat gain and generally require using 4~6 semiconductor lasers
Device, if it is desired to obtaining 0.5dB gain flatness, generally require and combined using the semiconductor laser of 8~10 different wave lengths
Get up to form combination raman pump source.The problem of so bringing is that the cost price of laser pump source is too high.
The content of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided one kind combination raman pump source,
Broadband flat-high-gain spectrum at least is realized only with two light source cans, reduces cost, and be suitably applied various pumps
The raman amplifier of Pu mode, it is particularly suitable for the raman amplifier of Pumped mode.The technical side that the utility model uses
Case is：
One kind combination raman pump source, including one or more 1 rank raman pump sources, one or more 2 rank Raman pumps
The one or more N ranks raman pump sources in source ..., N >=2, and a broadband wave multiplexer；The output end of each raman pump source point
Not Lian Jie broadband wave multiplexer each input；
1 rank raman pump source uses non-coherent broad band light source, and 2 ranks and 2 rank above raman pump sources use coherent laser light
Source；
Input signal optical spectrum is located at the N rank Raman frequency shifts of N rank coherent laser light source frequency spectrums, N >=2, meanwhile, input letter
Number optical spectrum is located at 1 rank Raman frequency shift of 1 rank non-coherent broad band light source frequency spectrum.
Further, described combination raman pump source, including a 1 rank raman pump source, one or more 2 rank Ramans
Pumping source, and a broadband wave multiplexer；The output end of each raman pump source connects each input of broadband wave multiplexer respectively；
1 rank raman pump source uses non-coherent broad band light source, and 2 rank raman pump sources use coherent laser light source；
Input signal optical spectrum is located at 2 rank Raman frequency shifts of 2 rank coherent laser light source frequency spectrums, meanwhile, input signal light
Frequency spectrum is located at 1 rank Raman frequency shift of 1 rank non-coherent broad band light source frequency spectrum.
Further, the frequency of coherent laser light source is higher than the frequency of non-coherent broad band light source, non-coherent broad band light source
Frequency be higher than flashlight frequency；The coherent laser light source frequency of high-order is higher than the coherent laser light source frequency of low order.
Further, the centre wavelength of 2 rank raman pump sources is between 1320nm~1380nm, narrower bandwidth, its
Three dB bandwidth is between 0.1~5nm；The centre wavelength of 1 rank raman pump source is between 1400nm~1500nm, broader bandwidth, its
Three dB bandwidth is between 10~100nm.
More preferably, for the centre wavelength of 1 rank raman pump source between 1420nm~1500nm, three dB bandwidth is 20~50nm.
Further, if combination raman pump source includes using 1 rank raman pump source of non-coherent broad band light source and adopted
With 2 rank raman pump sources of coherent laser light source, and the raman pump source in the absence of 3 ranks or more using coherent laser light source
When, the power of coherent laser light source is more than the power of non-coherent broad band light source.
Further, as N >=3, the coherent laser light source power of high-order is more than the coherent laser light source power of low order.
Further, wave multiplexer each input in broadband allows the raman pump source wave-length coverage by corresponding to connection therewith
Light, and the light-occlusive of other wave-length coverages is passed through；Common port allows through all raman pump sources being connected with each input
The light of wave-length coverage.
A kind of raman amplifier in the same direction, including transmitting terminal, power amplifier, signal pump combiner, described combination drawing
Graceful pumping source, Transmission Fibers, preamplifier, receiving terminal；
Transmitting terminal connects the input of power amplifier by optical fiber, and the output end of power amplifier is connected by optical fiber to be believed
The first end of number pump combiner, the output end of the combination raman pump source connect the of signal pump combiner by optical fiber
Two ends；The common port of signal pump combiner by Transmission Fibers connect preamplifier input, preamplifier it is defeated
Go out end and receiving terminal is connected by optical fiber.
A kind of reverse raman amplifier, including it is transmitting terminal, power amplifier, Transmission Fibers, signal pump combiner, described
Combination raman pump source, preamplifier, receiving terminal；
Transmitting terminal connects the input of power amplifier by optical fiber, and the output end of power amplifier is connected by Transmission Fibers
Connect the common port of signal pump combiner；The first end of signal pump combiner connects the input of preamplifier by optical fiber
End；The output end of the combination raman pump source connects the second end of signal pump combiner by optical fiber；Preamplifier
Output end connects receiving terminal by optical fiber.
The utility model has the advantage of：
（1）The combination raman pump source being bonded with coherent source and incoherent light source takes full advantage of coherent source
Monochromaticjty is good, and phase is unanimously and the characteristics of high-power output, while the characteristics of make use of incoherent light source wide bandwidth, with two
Light source can realizes broadband flat-high-gain spectrum.
（2）Overcome raman pump source that the single coherent source of tradition is formed in a fiber power density it is too high caused by by
Swash the non-linear phenomena such as Brillouin scattering, Raman lasing, higher Raman gain can be obtained；And the advantages of combining (1), can
To obtain higher broader Raman gain spectrum.
（3）By the cascade Raman frequency shift for selecting the frequency of coherent source and incoherent light source to form it, signal is set to exist
Power is more steady in optical fiber transmission, and noise figure is lower.
（4）The mode combined using coherent source and incoherent light source, overcome existing Raman pump in the same direction and be transmitted across
Intrinsic pumping-pumping in journey, pumping-signal, pumping-caused by signal-pumping increase Raman in the same direction the problems such as noise crosstalk interference
Benefit reaches 25dB, and receiving terminal OSNR OSNR improves more than 5dB, obtains more preferable laser propagation effect；With traditional pump mode
Compare, not only save the cost of raman amplifier, while system transmission performance is greatly improved, transmission range extends
More than 30km.
（5）The utility model proposes a kind of pumping source structure of optimization, by using the few light source can of quantity
Higher flat gain spectrum is obtained, saves cost.
（6）Combination raman pump source of the present utility model is adapted to the raman amplifier of various pump modes（Including pump in the same direction
Pu, backward pumping, bidirectional pumping structure, and distant pump Raman amplifier structure）, and advantage is more in co-pumping configuration
Substantially, can obtain than traditional raman amplifier（Pumping source is done only with coherent source）More preferable amplifier characteristic and system pass
Defeated characteristic.
（7）Raman pump source in the utility model has the characteristics of being easily achieved.High-order uses coherent source, and low order is adopted
With incoherent light source, agree with market actual provision situation.General incoherent light source power is difficult to reach more than watt level, and coherent light
Source is very easy to realize high power, and price is inexpensively.
Brief description of the drawings
Fig. 1 a are the 2 rank Raman amplifier structure schematic diagrames that conventionally employed coherent source combines.
Fig. 1 b are the spectrogram that conventionally employed coherent source is combined into 2 rank raman amplifiers.
Fig. 1 c are the gain spectra figure of 2 rank raman amplifiers of traditional coherent source.
Fig. 2 a are the structural representation of combination raman pump source of the present utility model.
Fig. 2 b are the flat gain spectrum figure of combination raman pump source of the present utility model.
Fig. 3 a are the spectrogram of 2 rank raman pump sources in one example of the utility model.
Fig. 3 b are the schematic diagram of a Raman pump frequency displacement of the present utility model.
Fig. 4 is the instance graph of one of the present utility model raman amplifier in the same direction of application.
Fig. 5 is the instance graph of one of the present utility model reverse raman amplifier of application.
Fig. 6 is the instance graph of an application two-way raman amplifier of the present utility model.
Fig. 7 is the instance graph of one of the present utility model distant pump raman amplifier of application.
Embodiment
With reference to specific drawings and examples, the utility model is described in further detail.
The rank raman amplifier of one kind 2 shown in Fig. 1 a needs 6 coherent sources as pumping source, wherein 1 rank Raman pump
4, source, wavelength are respectively 1425nm, 1435nm, 1445nm, 1455nm；2 rank raman pump sources are 2, and wavelength is respectively
1340nm, 1360nm；IPBCD1, IPBCD2 in Fig. 1 a are isolation polarized pump wave multiplexer, and MUX1 and MUX2 are broadband multiplex
Device；
The principle of Higher-order Raman pumping frequency displacement is to be transferred to the pump light of high power short wavelength by gain fibre power
The pump light of long wavelength, then again with the pump light of long wavelength come pump signal light；Principle such as Fig. 1 b of 2 rank Raman pump frequency displacements
Shown, the signal optical spectrum of wavelength 15xx nanometers is located at 2 rank Raman frequency shifts of wavelength 13xx nanometer pumping optical spectrums, wavelength
The signal optical spectrum of 15xx nanometers is located at 1 rank Raman frequency shift of wavelength 14xx nanometer pumping optical spectrums；The transfer process of pumping
It is from 13xx->14xx->15xx nanometers；
The gain spectra figure of 2 rank raman amplifiers shown in Fig. 1 a is referring to Fig. 1 c, from Fig. 1 c, its gain flatness
Index if requiring strict, it is also necessary to more coherent sources are as pumping source；
The utility model proposes combination raman pump source, as shown in Figure 2 a, including one or more 1 rank Raman pump
Source, the one or more N ranks raman pump sources of one or more 2 rank raman pump sources ..., N >=2, and a broadband multiplex
Device；The combination raman pump source at least only needs a 1 rank raman pump source, and a 2 rank raman pump sources and a broadband are closed
Ripple device；Also position of the utility model in raman amplifier in the same direction is illustrated in Fig. 2 a；The output end of each raman pump source point
Not Lian Jie broadband wave multiplexer each input；
1 rank raman pump source uses non-coherent broad band light source, and 2 ranks and 2 rank above raman pump sources use coherent laser light
Source；Coherent laser light source is laser type, can select Raman fiber lasers or semiconductor laser, has monochromaticjty
Well, the features such as phase is consistent, and power output is high；Non-coherent broad band light source is common wide light source, has spectral width is wide to wait spy
Point, spontaneous radiation light source, LED light source etc. can be used；Wherein there is following feature on the choice of frequencies：
Input signal optical spectrum is located at the N rank Raman frequency shifts of N rank coherent laser light source frequency spectrums, N >=2, meanwhile, input letter
Number optical spectrum is located at 1 rank Raman frequency shift of 1 rank non-coherent broad band light source frequency spectrum；The frequency of coherent laser light source is higher than incoherent
The frequency of wideband light source, the frequency of non-coherent broad band light source are higher than the frequency of flashlight；The coherent laser light source frequency of high-order is high
In the coherent laser light source frequency of low order.
After the light of coherent laser light source and non-coherent broad band light source enters gain transfer optical fiber jointly, the phase of high-order first
Its power is transferred to the coherent laser light source of low order by Raman frequency shift effect by dry LASER Light Source stepwise, and then 2 ranks are relevant swashs
Its power is transferred on 1 rank non-coherent broad band light source frequency spectrum and non-coherent broad band light source is amplified by radiant, after amplification
Power is further transferred to input signal light by non-coherent broad band light source power after being improved by Raman frequency shift；
Although simple incoherent light source can obtain relatively flat gain spectral, because spectral width is very wide, institute
It is scattered with luminous power, spectral concentration is also very low, so it is difficult to obtain higher Raman gain, that is to say, that pumping efficiency
Than relatively low.The mode combined using coherent source with incoherent light source, high frequency especially described in the utility model is using relevant
Light source, the method that low frequency uses incoherent light source, you can obtain high-gain to obtain flat gain and can, pump conversion efficiency is non-
Chang Gao.On the other hand, the situation for the light source supplied with reference to existing market, the Ramar laser of high frequency are very easy to obtain tens of watts
High power, and the incoherent light source power of low frequency is typically extremely difficult to a watt level.Thus the utility model is to combine real feelings
The effective scheme that condition proposes, is more suitable for actual conditions, is also more prone to implement.
It is the example of a combination raman pump source below, an including 1 rank raman pump source, 22 rank Raman pumps
Source, and a broadband wave multiplexer；The broadband flat gain spectrum figure that the combination raman pump source is realized is referring to Fig. 2 b；
22 rank raman pump sources use semiconductor laser or Raman fiber lasers, using the teaching of the invention it is possible to provide foot more than watt level
Enough high pump powers；Laser has the characteristics of monochromaticjty is good, and phase is consistent, and power output is high；Its RIN simultaneously（It is relatively strong
Spend noise）Noise figure is than relatively low, generally less than -110dB/Hz；
2 rank raman pump sources are coherent source, and its frequency is higher than the 1 rank raman pump source using non-coherent broad band light source, 2
The scheme of rank Raman pump source frequency selection is to allow flashlight to be located at its Stokes shift, even input signal optical spectrum position
In 2 rank raman pump sources of high frequency（Coherent laser light source）2 rank Raman frequency shifts at.
As shown in Figure 3 a, wavelength is respectively 1340nm and 1360nm to the spectrum of 22 rank raman pump sources；Typically, 2 rank
The centre wavelength of raman pump source is between 1320nm~1380nm；The narrower bandwidth of 2 rank raman pump sources, its three dB bandwidth
Between 0.1~5nm；
1 rank raman pump source of low frequency uses non-coherent broad band light source, such as wavelength 14xx nm spontaneous radiation light source
（Non-laser）Or LED light source, the centre wavelength of non-coherent broad band light source is between 1400nm~1500nm, non-coherent broad band light
Source has that band is wide, between 10~100nm of bandwidth, the features such as phase is mixed and disorderly.The centre wavelength of non-coherent broad band light source is excellent
It is selected between 1420m~1500nm, typical three dB bandwidth such as 20~50nm of non-coherent broad band light source；Its RIN noise figure is low
In -110GHz.Its frequency selection scheme is：Input signal optical spectrum is located at 1 rank Raman frequency shift of non-coherent broad band light source；
So incoherent pump source can directly amplify to optical signal, the signal spectrum after amplification has with wide, the characteristics of flat gain；
Several semiconductor lasers in traditional scheme are replaced to obtain width only with an incoherent light source can in the utility model
Band flat gain spectrum；So the utility model has the characteristics of inexpensive.
Incoherent light source has the characteristics that broadband spectral.The characteristics of using light source broadband spectral, it can not only greatly reduce
The quantity of laser in pumping source, and because the wide spectrum characteristic of incoherent light source can effectively reduce the SBS in optical fiber（By
Swash Brillouin scattering）Damage.Due to incoherent pump phase error the characteristics of, can effectively suppress pump in Raman in the same direction transmission
Pu-pumping, the four-wave mixing between pumping-signal between ASE (magnification method) noise（FWM）Etc. nonlinear effect.
Broadband wave multiplexer can be a branch of by the light compositing of the coherent laser light source of high frequency and the non-coherent broad band light source of low frequency
Light, broadband wave multiplexer can be a branch of by the light compositing of different wave length, and each input allows the Raman pump by corresponding to connection therewith
The light of Pu source wavelength scope, and the light-occlusive of other wave-length coverages is passed through；Common port allows to pass through what is be connected with each input
The light of all raman pump source wave-length coverages；Such as one of input can by 1320~1380nm light, in addition one
Individual input can pass through 1400~1500nm light, its common port, it is allowed to 1320~1380nm ＆1400~1500nm wavelength
Light pass through.
The raman amplifier in the same direction formed with the combination raman pump source（Or to be preceding to raman amplifier）'s
Example as shown in figure 4, including transmitting terminal, power amplifier, signal pump combiner, combination raman pump source, Transmission Fibers, can
Preamplifier, the receiving terminal of choosing；Transmitting terminal connects the input of power amplifier, the output end of power amplifier by optical fiber
The first end of signal pump combiner is connected by optical fiber, the output end for combining raman pump source connects signal pumping by optical fiber
Second end of wave multiplexer；The common port of signal pump combiner connects the input of preamplifier by Transmission Fibers, preposition
The output end of amplifier connects receiving terminal by optical fiber；
To amplification due to pump light and flashlight injection fibre simultaneously before traditional Raman, due to coherent source bandwidth very
It is narrow, only 2nm or so, so its spectral concentration is very high, it is very easy to reach non-linear threshold, produces in a fiber serious non-
Linearly；Nonlinear effect in optical fiber will cause inter-channel crosstalk and energy loss, influence the transmission quality of signal, limit system
Transmission rate and transmission range；Using the technical solution of the utility model, 1 rank raman pump source uses the incoherent light in broadband
Source, spectral bandwidth can be up to tens nanometers, and spectral concentration is low to be not readily reachable by non-linear threshold, and then avoids producing in a fiber
Nonlinear effect.Still further aspect, 2 rank above raman pump sources use high-power relevant pumping in the utility model
Source, 1 rank use noncoherent Broadband pump source, and this combination is especially suitable for forward pumping mode.This combination drop
The low power requirement to 1 rank raman pump source, because the power of 2 rank pumping sources is shifted by Raman frequency shift in Transmission Fibers
To 1 rank pumping source, this transfer is progressively carried out in the transmission, so being not in 1 big rank pumping everywhere in optical fiber
Power is also gradually to be transferred to by Raman frequency shift on signal light wavelength by power, similarly, 1 rank pumping source, this power transfer
And progressively carry out in a fiber.Flat signal gain spectrum can be not only obtained in this way, and signal exists
Transmitting procedure in optical fiber is all uniform everywhere, has been effectively shielded from nonlinear effect in optical fiber.Meanwhile by this pumping source
Be applied in the system of fl transmission, reduce before to ASE noise powers.
The utility model and the forward pumping mode formed using common diode-end-pumped（Gain is less than
10dB）Compare, forward direction Raman gain reaches more than 20dB, system transmission surplus increase 6dB, transmission range increase more than 30km；
OSNR OSNR improves more than 5dB.
If combining raman pump source is included using 1 rank raman pump source of non-coherent broad band light source and using coherent laser
2 rank raman pump sources of light source, and in the absence of 3 ranks or more using coherent laser light source raman pump source when, coherent laser
The power of light source is more than the power of non-coherent broad band light source.
When combining the raman pump source for also including 3 ranks or more use coherent laser light source in raman pump source, high-order
Coherent laser light source power be more than low order coherent laser light source power, effect can be more preferably；And the power of 2 rank raman pump sources
1 rank raman pump source can be less than（Non-coherent broad band light source）Power；As shown in Figure 3 b, λsignalFor signal light wavelength, λ1st、
λ2nd、λ3rdRespectively 1 rank, 2 ranks, the optical wavelength of 3 rank raman pump sources；
The reverse raman amplifier formed with the combination raman pump source is as shown in figure 5, including transmitting terminal, power amplification
Device, Transmission Fibers, signal pump combiner, described combination raman pump source, preamplifier, receiving terminal；Transmitting terminal passes through
Optical fiber connects the input of power amplifier, and the output end of power amplifier connects signal pump combiner by Transmission Fibers
Common port；The first end of signal pump combiner connects the input of preamplifier by optical fiber；The combination Raman pump
The output end in source connects the second end of signal pump combiner by optical fiber；The output end of preamplifier is connect by optical fiber
Receiving end.
The two-way raman amplifier formed with the combination raman pump source is as shown in Figure 6；It is exactly Raman amplifiction in the same direction
The combination of device and reverse raman amplifier；
The combination raman pump source can also be used in the raman amplifier of distant pump mode, as shown in fig. 7, the combination Raman pump
Pu source provides reverse raman pump light source for Transmission Fibers 2 first, to Raman gain after being produced in Transmission Fibers 2；Transmission
The length of optical fiber 2 is generally 70~120km.The remotely pumping source of the combination raman pump source or remote gain module simultaneously,
Erbium-doped fiber in Fig. 7 is as remote gain module.Pump light is used for by there remains part pump power after Transmission Fibers 2
As the pumping of Er-doped fiber, larger erbium fibre gain is produced in Er-doped fiber.
Claims (10)
1. one kind combination raman pump source, it is characterised in that including one or more 1 rank raman pump sources, one or more 2 ranks
The one or more N ranks raman pump sources of raman pump source ..., N >=2, and a broadband wave multiplexer；Each raman pump source
Output end connects each input of broadband wave multiplexer respectively；
1 rank raman pump source uses non-coherent broad band light source, and 2 ranks and 2 rank above raman pump sources use coherent laser light source；
Input signal optical spectrum is located at the N rank Raman frequency shifts of N rank coherent laser light source frequency spectrums, N >=2, meanwhile, input signal light
Frequency spectrum is located at 1 rank Raman frequency shift of 1 rank non-coherent broad band light source frequency spectrum.
2. combination raman pump source as claimed in claim 1, it is characterised in that including a 1 rank raman pump source, one or
Multiple 2 rank raman pump sources, and a broadband wave multiplexer；The output end of each raman pump source connects broadband wave multiplexer respectively
Each input；
1 rank raman pump source uses non-coherent broad band light source, and 2 rank raman pump sources use coherent laser light source；
Input signal optical spectrum is located at 2 rank Raman frequency shifts of 2 rank coherent laser light source frequency spectrums, meanwhile, input signal optical spectrum
At 1 rank Raman frequency shift of 1 rank non-coherent broad band light source frequency spectrum.
3. combination raman pump source as claimed in claim 1 or 2, it is characterised in that
The frequency of coherent laser light source is higher than the frequency of non-coherent broad band light source, and the frequency of non-coherent broad band light source is higher than flashlight
Frequency；
The coherent laser light source frequency of high-order is higher than the coherent laser light source frequency of low order.
4. combination raman pump source as claimed in claim 3, it is characterised in that
The centre wavelength of 2 rank raman pump sources is between 1320nm~1380nm, narrower bandwidth, its three dB bandwidth be 0.1~
Between 5nm；The centre wavelength of 1 rank raman pump source is between 1400nm~1500nm, broader bandwidth, its three dB bandwidth be 10~
Between 100nm.
5. combination raman pump source as claimed in claim 4, it is characterised in that
For the centre wavelength of 1 rank raman pump source between 1420nm~1500nm, three dB bandwidth is 20~50nm.
6. combination raman pump source as claimed in claim 2, it is characterised in that
The power of coherent laser light source is more than the power of non-coherent broad band light source.
7. combination raman pump source as claimed in claim 6, it is characterised in that
As N >=3, the coherent laser light source power of high-order is more than the coherent laser light source power of low order.
8. combination raman pump source as claimed in claim 1 or 2, it is characterised in that
Wave multiplexer each input in broadband allows the light of the raman pump source wave-length coverage by corresponding to connection therewith, and to other ripples
The light-occlusive of long scope passes through；Common port allows the light through all raman pump source wave-length coverages being connected with each input.
9. a kind of raman amplifier in the same direction, it is characterised in that including transmitting terminal, power amplifier, signal pump combiner, such as weigh
Profit requires combination raman pump source, Transmission Fibers, preamplifier, the receiving terminal any one of 1~8；
Transmitting terminal connects the input of power amplifier by optical fiber, and the output end of power amplifier connects signal pump by optical fiber
The first end of Pu wave multiplexer, the output end of the combination raman pump source connect the second of signal pump combiner by optical fiber
End；The common port of signal pump combiner connects the input of preamplifier, the output of preamplifier by Transmission Fibers
End connects receiving terminal by optical fiber.
10. a kind of reverse raman amplifier, it is characterised in that including transmitting terminal, power amplifier, Transmission Fibers, signal pumping
Wave multiplexer, combination raman pump source such as according to any one of claims 1 to 8, preamplifier, receiving terminal；
Transmitting terminal connects the input of power amplifier by optical fiber, and the output end of power amplifier is connected by Transmission Fibers to be believed
The common port of number pump combiner；The first end of signal pump combiner connects the input of preamplifier by optical fiber；Institute
The output end for stating combination raman pump source connects the second end of signal pump combiner by optical fiber；The output end of preamplifier
Receiving terminal is connected by optical fiber.
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| CN107171169A (en) * | 2017-07-03 | 2017-09-15 | 无锡市德科立光电子技术有限公司 | Combine raman pump source and raman amplifier |
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| CN107171169A (en) * | 2017-07-03 | 2017-09-15 | 无锡市德科立光电子技术有限公司 | Combine raman pump source and raman amplifier |
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