CN207135105U - A kind of multi-wavelength repeatless transmission system - Google Patents
A kind of multi-wavelength repeatless transmission system Download PDFInfo
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- CN207135105U CN207135105U CN201720793407.3U CN201720793407U CN207135105U CN 207135105 U CN207135105 U CN 207135105U CN 201720793407 U CN201720793407 U CN 201720793407U CN 207135105 U CN207135105 U CN 207135105U
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Abstract
The utility model discloses a kind of multi-wavelength repeatless transmission system, including multi-wavelength emission machine, multi-wavelength receiver and the Transmission Fibers of connection multi-wavelength emission machine and multi-wavelength receiver, multi-wavelength emission machine, which sends optical signal, to transmit at most multi-wavelength receiver by Transmission Fibers, wherein, in addition to：Erbium and ytterbium codoping high power light amplifier, erbium and ytterbium codoping high power light amplifier in is connected with multi-wavelength emission machine output end, erbium and ytterbium codoping high power light amplifier out is connected with Transmission Fibers, erbium and ytterbium codoping high power light amplifier can provide the power output more than 34dBm, multi-wavelength emission machine includes the transmitter module for suppressing function with SBS, and one end of multi-wavelength receiver also includes 2 rear end remote gain units, 2 rear end remotely pumping units and the rear end bypass fibers of connection rear end remote gain unit and rear end remotely pumping unit.Multi-wavelength repeatless transmission system provided by the utility model extends the transmission range of multi-wavelength repeatless transmission system.
Description
Technical field
It the utility model is related to technical field of optical fiber communication, more particularly to a kind of multi-wavelength repeatless transmission system.
Background technology
Particular application in undersea transmission or land, because natural conditions limit, it can not be built in transmission link
Vertical active relaying and monitoring system, or can not be born by operator using the operation after active relaying and maintenance cost.And surpass
Cable length between long span optical transmission system website typically can reach hundreds of kilometer, and any power supply is not present among circuit
Trunking, therefore any power supply unit is avoided the need between two websites of overlength span, exactly because such overlength span
Optical transmission system can reduce system Construction cost, while it is stronger to cause that its system has the characteristics of do not include electric trunking
Reliability and stability.One Non-relay Ultra Long Span Optical Transmission System is in order to realize that extra long distance relays conversion equipment without electricity, typically
Want the various fiber amplifier configuring technicals of integrated use.
Along with the increase of luminous power in optical fiber and being on the increase for the number of channel, the nonlinear effect in optical fiber has become
The key factor of influence system practical application.Due to stimulated Brillouin scattering（SBS）Threshold value is relatively low, so being easy in a fiber
Produce, it has also become the key issue that must take into consideration during design fibre system（In general single mode Transmission Fibers（SSMF）It is excited
Brillouin dissipates threshold value and is less than 10dBm）.
Simultaneously before the multi-wavelength that is used in the prior art in ultra-long span light transmission system to Raman amplifiction technology due to
The gain that it is provided is smaller, typically only 4~6dB, therefore can not meet longer transmission span requirement；And forward direction Raman is put
In big device, pump light enters optical fiber from transmitting terminal together with flashlight, because signal has very strong depletion action to pumping, so
The fluctuation of total power signal will cause the increase of pumping relative intensity noise, and in turn, the relative intensity noise of pumping can turn again
Move on on signal, form the signal cross-talk using pumping as medium.Document shows, right in order to ensure that the damage of Q values is no more than 0.5dB
In True-wave optical fiber, Raman gain must not exceed 6dB, and SMF raman gain fibers are not allowed then to be more than 10dB.
And although distant pump amplifying technique can provide certain gain, when pumping exceedes certain power, pump light exists
Self-excitation phenomena is produced in optical fiber, transmission signal is disturbed, even bypass Remote optical pumping amplifier, self-excitation phenomena can also limit pumping
The raising of power, and then limit transmission range.
Therefore, how to extend the transmission range of multi-wavelength repeatless transmission system turns into technical problem urgently to be resolved hurrily.
The content of the invention
The utility model is intended at least solve one of technical problem present in prior art, there is provided a kind of multi-wavelength is without in
After Transmission system, to solve the problems of the prior art.
As one side of the present utility model, there is provided a kind of multi-wavelength repeatless transmission system, including multi-wavelength emission
Machine, multi-wavelength receiver and the Transmission Fibers for connecting the multi-wavelength emission machine and the multi-wavelength receiver, the multi-wavelength
The optical signal that emitter is sent can be transmitted to the multi-wavelength receiver by the Transmission Fibers, wherein, the multi-wavelength
Repeatless transmission system also includes：Erbium and ytterbium codoping high power light amplifier, the input of the erbium and ytterbium codoping high power light amplifier
End is connected with the output end of the multi-wavelength emission machine, output end and the transmission of the erbium and ytterbium codoping high power light amplifier
Optical fiber connects, and the erbium and ytterbium codoping high power light amplifier can provide the power output more than 34dBm to lift more ripples
The power for the optical signal that long emitter is sent, the multi-wavelength emission machine includes the transmitter module for suppressing function with SBS, described
One end of multi-wavelength receiver also include 2 rear end remote gain units, 2 rear end remotely pumping units and connection it is described after
Hold the rear end bypass fibers of remote gain unit and the rear end remotely pumping unit, the 1st rear end remote gain unit
It is arranged on apart from the multi-wavelength receiver L1The position of length, the 2nd rear end remote gain unit are arranged on apart from institute
State multi-wavelength receiver L1+L2The position of length, and the 1st rear end remote gain unit of connection and the 1st rear end are remote
The length of the rear end bypass fibers of journey pump unit is L1, connect the 2nd rear end remote gain unit and the 2nd it is described after
The length for holding the rear end bypass fibers of remotely pumping unit is L1+L2, 2 rear end remotely pumping units with more ripples
Long receiver homonymy is set；The first input end of 2nd rear end remote gain unit passes through the Transmission Fibers and the erbium ytterbium
The output end connection of high power light amplifier is co-doped with, the second input of the 2nd rear end remote gain unit passes through the rear end
Bypass fibers are connected with the 2nd rear end remotely pumping unit, and the output end of the 2nd rear end remote gain unit passes through the transmission
Optical fiber is connected with the first input end of the 1st rear end remote gain unit, the second input of the 1st rear end remote gain unit
It is connected with the output end of the 1st rear end remotely pumping unit by the rear end bypass fibers, the 1st rear end remote gain unit
Output end be connected by the Transmission Fibers with the multi-wavelength receiver.
Preferably, the erbium and ytterbium codoping high power light amplifier is by the seed source amplifier of prime and the power amplification of rear class
Device forms, wherein the seed source amplifier of the prime by single mode Er-doped fiber as gain media, for by transmission signal
Power is lifted at least 15dBm, the power amplifier of the rear class from 0dBm to be situated between by erbium ytterbium co doped double clad fiber as gain
Matter, further at least 30dBm is arrived in lifting to the power for the transmission signal after the seed source amplifier lifting by the prime.
Preferably, it is long-range to include rear end Er-doped fiber, rear end wave multiplexer and rear end for each rear end remote gain unit
Passive module,
The first input end of rear end wave multiplexer in each rear end remote gain unit is that each rear end is long-range
The first input end of gain unit, each the second input of the rear end wave multiplexer in the rear end remote gain unit is each
The output of second input of the rear end remote gain unit, each the rear end wave multiplexer in the rear end remote gain unit
End and the input of the rear end remote passive module in each rear end remote gain unit pass through the rear end Er-doped fiber
Connection, each the output end of the rear end remote passive module in the rear end remote gain unit is that each rear end remotely increases
The output end of beneficial unit.
Preferably, first rear end remotely pumping unit includes at least one single order Ramar laser, and second rear end is remote
Journey pump unit includes at least one single order Ramar laser and at least one second order Ramar laser.
Preferably, the difference of the frequency of the 1 rank Ramar laser and the 2 rank Ramar laser is 13.2THz.
Preferably, the wave-length coverage of the single order Ramar laser is 1430 ~ 1480nm, the second order Ramar laser
Wave-length coverage is 1360 ~ 1400nm.
Preferably, the Insertion Loss of the rear end bypass fibers no more than the Transmission Fibers Insertion Loss, and by the rear end
Road fiber lengths are equal to the length of the corresponding Transmission Fibers.
Preferably, by the rear end for connecting first rear end remote gain unit and first rear end remotely pumping unit
The length L of road optical fiber1For 70 ~ 100km, second rear end remote gain unit and second rear end remotely pumping unit are connected
The length L of the rear end bypass fibers1+L2For 120 ~ 170km.
Preferably, the multi-wavelength repeatless transmission system includes preamplifier, the input of the preamplifier
It is connected with the output end of the 1st rear end remote gain unit, the output end of the preamplifier connects with the multi-wavelength
The input connection of receipts machine.
Preferably, the multi-wavelength repeatless transmission system includes the first dispersion compensation unit and the second dispersion compensation list
Member；
The input of first dispersion compensation unit is connected with the output end of the multi-wavelength emission machine, first color
The output end for dissipating compensating unit is connected with the input of the erbium and ytterbium codoping high power light amplifier, the first dispersion compensation list
The optical signal that member can be sent to the multi-wavelength emission machine carries out dispersion pre-compensation；
The input of second dispersion compensation unit is connected with the output end of the preamplifier, second dispersion
The output end of compensating unit is connected with the input of the multi-wavelength receiver, and second dispersion compensation unit can be to transmission
Optical signal before to the multi-wavelength receiver carries out dispersion compensation.
Multi-wavelength repeatless transmission system provided by the utility model, by setting erbium and ytterbium codoping high power light amplifier,
The power for the optical signal that multi-wavelength emission machine is sent can be lifted, so that the optical signal transmission that multi-wavelength emission machine is sent
It is farther, and then extend the transmission range of multi-wavelength repeatless transmission system；Received in addition in multi-wavelength emission machine and multi-wavelength
The rear end remote gain unit of cascade is set between machine, and the rear end remote gain list with cascade is set at multi-wavelength receiver
First corresponding rear end remotely pumping unit, and by rear between rear end remotely pumping unit and the rear end remote gain unit of cascade
Bypass fibers connection is held, rear end remotely pumping unit sends pump light source to corresponding rear end by rear end bypass fibers
Remote gain unit, the optical signal reached at the rear end remote gain unit is amplified, the transmission to be communicated with extended fiber
Distance, rear end remote gain unit of the utility model due to including cascade, it is thus possible in the non-relay biography of foregoing multi-wavelength
The transmission range that further extended fiber communicates on the basis of defeated system.
Brief description of the drawings
Accompanying drawing is to be further understood for providing to of the present utility model, and a part for constitution instruction, and following
Embodiment be used to explain the utility model together, but do not form to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is a kind of structural representation of embodiment of multi-wavelength repeatless transmission system provided by the utility model.
Fig. 2 is the structural representation of the another embodiment of multi-wavelength repeatless transmission system provided by the utility model
Figure.
Fig. 3 is the principle schematic that multi-wavelength repeatless transmission system provided by the utility model is extended transmission distance.
Fig. 4 is that the structure of first rear end remote gain unit 210 in Fig. 2 embodiments provided by the utility model is shown
It is intended to.
Fig. 5 is that the structure of second rear end remote gain unit 210 in Fig. 2 embodiments provided by the utility model is shown
It is intended to.
Fig. 6 is the structural representation of two rear end remote gain units 210 in Fig. 1 embodiments provided by the utility model
Figure.
Embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
As one side of the present utility model, as shown in Figure 1, there is provided a kind of multi-wavelength repeatless transmission system 10, bag
Include multi-wavelength emission machine 100, multi-wavelength receiver 200 and connect the multi-wavelength emission machine 100 and the multi-wavelength receiver
200 Transmission Fibers 300, the optical signal that the multi-wavelength emission machine 100 is sent can be transmitted by the Transmission Fibers 300 to
The multi-wavelength receiver 200, wherein, the multi-wavelength repeatless transmission system 10 also includes：Erbium and ytterbium codoping high power light is put
Big device 400, the input of the erbium and ytterbium codoping high power light amplifier 400 connect with the output end of the multi-wavelength emission machine 100
Connect, the output end of the erbium and ytterbium codoping high power light amplifier 400 is connected with the Transmission Fibers 300, and the erbium and ytterbium codoping is high
Power image intensifer 400 can provide the power output more than 34dBm, and the multi-wavelength emission machine 100 includes suppressing with SBS
The transmitter module of function, one end of the multi-wavelength receiver 200 also include 2 rear end remote gain units, 210,2 rear ends
Remotely pumping unit 220 and the rear end for connecting the rear end remote gain unit 210 and the rear end remotely pumping unit 220
Bypass fibers 230, the 1st rear end remote gain unit 210 are arranged on apart from the L of multi-wavelength receiver 2001Length
Position, the 2nd rear end remote gain unit 210 be arranged on apart from the L of multi-wavelength receiver 2001+L2The position of length
Put, and connect the rear end bypass of the 1st rear end remote gain unit 210 and the 1st rear end remotely pumping unit 220
The length of optical fiber 230 is L1, connect the 2nd rear end remote gain unit 210 and the 2nd rear end remotely pumping unit
The length of 220 rear end bypass fibers 230 is L1+L2, 2 rear end remotely pumping units 220 with the multi-wavelength receive
The homonymy of machine 200 is set；The first input end of 2nd rear end remote gain unit 210 passes through the Transmission Fibers 300 and the erbium
Ytterbium is co-doped with the output end connection of high power light amplifier 400, and the second input of the 2nd rear end remote gain unit 210 passes through
The rear end bypass fibers 230 are connected with the 2nd rear end remotely pumping unit 220, the 2nd rear end remote gain unit 210
Output end is connected by the Transmission Fibers 300 with the first input end of the 1st rear end remote gain unit 210, the 1st rear end
The output end of second input of remote gain unit 210 and the 1st rear end remotely pumping unit 220 is bypassed by the rear end
Optical fiber 230 is connected, and the output end of the 1st rear end remote gain unit 210 is connect by the Transmission Fibers 300 with the multi-wavelength
Receipts machine 200 connects.
Multi-wavelength repeatless transmission system provided by the utility model, by setting erbium and ytterbium codoping high power light amplifier,
The power for the optical signal that multi-wavelength emission machine is sent can be lifted, so that the optical signal transmission that multi-wavelength emission machine is sent
It is farther, and then extend the transmission range of multi-wavelength repeatless transmission system；Received in addition in multi-wavelength emission machine and multi-wavelength
Cascade rear end remote gain unit is set between machine, and setting is corresponding with rear end remote gain unit at multi-wavelength receiver
Rear end remotely pumping unit, and connected between rear end remotely pumping unit and rear end remote gain unit by rear end bypass fibers
Connect, rear end remotely pumping unit sends pump light source to corresponding rear end remote gain list by rear end bypass fibers
Member, the optical signal reached at the rear end remote gain unit is amplified, the transmission range to be communicated with extended fiber, this practicality
It is new due to including rear end remote gain unit, it is thus possible to enter one on the basis of foregoing multi-wavelength repeatless transmission system
The transmission range of step ground extended fiber communication.
Specifically, as shown in Figure 1,2 are set between the multi-wavelength emission machine 100 and the multi-wavelength receiver 200
Individual rear end remote gain unit 210, the distance of first rear end remote gain unit 210 to the multi-wavelength receiver 200 are
L1, the distance of second rear end remote gain unit 210 to the multi-wavelength receiver 200 is L1+L2, while connect in multi-wavelength
Receipts machine 200 sets 2 rear end remotely pumping units 220 corresponding with the rear end remote gain unit 210, wherein after first
End remotely pumping unit 220 is connected by the rear end bypass fibers 230 with first rear end remote gain unit 210,
Second rear end remotely pumping unit 220 passes through the rear end bypass fibers 230 and second rear end remote gain unit
210 connections.
It should be appreciated that each rear end remote gain unit 210 include first input end, the second input and
Output end, the first input end of the 2nd rear end remote gain unit 210 are used to be connected with the multi-wavelength emission machine 100,
The output end of the 1st rear end remote gain unit 210 is used to be connected with the multi-wavelength receiver 200.It is each it is described after
Second input of end remote gain unit 210 is used to by the rear end bypass fibers and the corresponding rear end expedition pump
The output end connection of Pu unit 220.Pump light is passed through the rear end bypass fibers by each rear end remotely pumping unit 220
Deliver to the corresponding rear end remote gain unit 210, so as to get up to the opening position of rear end remote gain unit 210
Optical signal is amplified by pump light, so as to transmit farther distance.
It is understood that first rear end remote gain unit 210 is apart from the distance of the multi-wavelength receiver 200
L1, thus after pump light is delivered to first rear end remote gain unit 210 by first rear end remotely pumping unit 220, can
So that the transmission range of the repeatless transmission system extends L1Distance, second rear end remotely pumping unit 220 is by pump light
After delivering to second rear end remote gain unit 210, the transmission range of the repeatless transmission system is enabled to extend L1+L2
Distance.
Specifically, the embodiment as the erbium and ytterbium codoping high power light amplifier 400, the erbium and ytterbium codoping are high
Power image intensifer 400 is made up of the seed source amplifier of prime and the power amplifier of rear class, wherein the seed of the prime
Source amplifier by single mode Er-doped fiber as gain media, for the power of transmission signal to be lifted at least 15dBm from 0dBm,
The power amplifier of the rear class by erbium ytterbium co doped double clad fiber as gain media, for the seed source of the prime to be put
Further at least 30dBm is arrived in lifting to the power of transmission signal after big device lifting.
As the embodiment of the rear end remote gain unit 210, specifically, each rear end remote gain
Unit 210 includes rear end Er-doped fiber, rear end wave multiplexer and rear end remote passive module,
The first input end of rear end wave multiplexer in each rear end remote gain unit is that each rear end is long-range
The first input end of gain unit, each the second input of the rear end wave multiplexer in the rear end remote gain unit is each
The output of second input of the rear end remote gain unit, each the rear end wave multiplexer in the rear end remote gain unit
End and the input of the rear end remote passive module in each rear end remote gain unit pass through the rear end Er-doped fiber
Connection, each the output end of the rear end remote passive module in the rear end remote gain unit is that each rear end remotely increases
The output end of beneficial unit.
Specifically, as shown in Fig. 2 each rear end remote gain unit 210 includes rear end remote passive module, rear end
Wave multiplexer WDM1And connect the rear end remote passive module and the rear end wave multiplexer WDM1Rear end Er-doped fiber, first
The output end of rear end remote passive module in the individual rear end remote gain unit 210 and rear end wave multiplexer WDM1It is first defeated
Enter end to connect by the rear end Er-doped fiber, the rear end remote passive mould in second rear end remote gain unit 210
The input of block and rear end wave multiplexer WDM2Output end connection, the rear end in second rear end remote gain unit 210
The output end of remote passive module passes through in the Transmission Fibers 300 and the described first rear end remote gain unit 210
Rear end remote passive module input connection.In addition, the rear end multiplex in first rear end remote gain unit 210
Device WDM1Output end be connected by the Transmission Fibers 300 with the multi-wavelength receiver 200, the 2nd rear end is long-range
Rear end wave multiplexer WDM in gain unit 2102First input end pass through the Transmission Fibers 300 and the multi-wavelength emission
Machine 100 connects.
Accordingly, each rear end remotely pumping unit 220 at the multi-wavelength receiver 200 passes through respectively
Pumping source is delivered into corresponding each rear end wave multiplexer with the rear end bypass fibers of corresponding Transmission Fibers equal length
Second input, realize the pumping to rear end remote passive module.
It should be noted that two rear end remote gain units 210 in multi-wavelength repeatless transmission system shown in Fig. 2
Using different pump modes, wherein first rear end remote gain unit 210 is located at apart from receiving terminal L1The place of distance, its
Pumping source is that several semiconductors being located at by wavelength near 1430 ~ 1480nm swash with great distance end-pumping source positioned at receiving terminal
Light device is formed, between 1 ~ 1.5W of pumping general power.Pump power is to be delivered to gain fibre by Transmission Fibers.With great distance journey
Two effects are played in pumping：First, providing Raman pump to Transmission Fibers, Raman gain is produced in Transmission Fibers；Second,
Raman residue pump power is passed into first rear end remote gain unit 210 by Transmission Fibers, it is remote first rear end
Certain gain is produced in journey gain unit 210.
Second rear end remote gain unit 210 is located at apart from receiving terminal computer room L1+L2Place, its distal end pumping source is still
So it is located at receiving terminal computer room.Because second rear end remote gain unit 210 is farther from its pumping, so needing bigger pumping
Power.By the way of two directional pump, pumping is carried out to gain fibre respectively from the front and back of gain fibre, pump light is
It is L by two segment length1+L2Bypass fibers transmission it is past.
Preferably, in the embodiment shown in Fig. 2, the structural representation of first rear end remote gain unit 210
For figure as shown in figure 4, using with road pump mode, pump light is introduced into Transmission Fibers 300, after reaching rear end remote passive module,
Pumping is by from inverse injection to rear end wave multiplexer WDM2In.
In embodiment shown in Fig. 2, structural representation such as Fig. 5 of second rear end remote gain unit 210
Shown, its structure is similar with Fig. 4, but pump mode is bypass pumping.
Preferably, in the embodiment shown in Fig. 1, after first rear end remote gain unit 210 and second
Hold the concrete structure of remote gain unit 210 identical, its structural representation is as shown in fig. 6, using bypass pump mode.
As the embodiment of previously described rear end remotely pumping unit 220, first rear end remotely pumping list
Member 220 includes at least one single order Ramar laser, and second rear end remotely pumping unit 220 includes at least one single order Raman
Laser and at least one second order Ramar laser.
Preferably, the difference of the frequency of the 1 rank Ramar laser and the 2 rank Ramar laser is 13.2THz.
It is further preferred that the wave-length coverage of the single order Ramar laser is 1430 ~ 1480nm, the second order Raman swashs
The wave-length coverage of light device is 1360 ~ 1400nm.
It is understood that follow Raman between the wavelength of the 2nd rank Ramar laser and the wavelength of the 1st rank Ramar laser
The relation of the Stokes shift of excitation wavelength, the i.e. difference of the frequency of the two are 13.2THz or so, and the Ramar laser
It can be replaced with the semiconductor laser.
Specifically, first rear end remotely pumping unit 220 is typically made up of several 1 rank Raman pump lasers, its
Wavelength is normally near 1430 ~ 1480nm, for direct to the Er-doped fiber in its corresponding rear end remote gain unit 210
Pumping and produce gain.The length of the corresponding rear end bypass fibers is typically 70 ~ 100km, L2Length for 50 ~
70km.Usual L1+ L2Length is longer, and the transmission range of the multi-wavelength repeatless transmission system is longer.
It should be noted that the frequency transmission signal of first rear end remotely pumping unit 220 is located at 1 rank pump laser
Raman frequency shift at, 1 rank pump laser can directly amplify signal power.
Second rear end remotely pumping unit 220 is by several 1 rank Ramar lasers and several 2 rank Raman pump laser
Device is formed.Wherein 1 rank pump laser, its wavelength are located near 1430 ~ 1480nm, for Er-doped fiber pump-coupling and
Gain is produced, 2 rank Raman pump laser its wavelength are located near 1360 ~ 1400nm, and the frequency of 1 rank pumping source is located at 2 rank pumps
At the Raman frequency shift in Pu source, for producing Raman gain first to 1 rank pump laser, i.e., hold in the rear in bypass fibers,
Optical signal is before second rear end remote gain unit 210 is reached, and 2 rank pumping laser therein is first to 1 rank pumping
Laser carries out pumping, and is amplified the laser signal of 1 rank pumping wavelength, and 1 rank pump power is improved, and passes through this method
1 rank pump power can be improved, and 1 rank pumping source is pushed to apart from the farther position of multi-wavelength receiver, i.e., apart from multi-wavelength
Receiver L1+L2At second back-end gain cell position of distance, therefore can second back-end gain by this structure
Unit is positioned at the optical signal for remaining able to make the multi-wavelength emission machine transmitting apart from the farther place of the multi-wavelength receiver
Obtain actual gain.
Therefore, transmission range of the optical signal that sends of multi-wavelength emission machine in Transmission Fibers is caused to increase through the above way
L is added2。
2nd rear end remotely pumping unit 220 is made up of several 1 ranks, several 2 rank Raman pump lasers, is passed through
Bypass fibers L1+L2Pump light is delivered in second rear end remote gain unit 210.During pumping is sent to, utilize
Rear end bypass fibers L1+L2As gain media, 2 rank raman laser therein amplifies 1 rank raman laser first, and 1 rank Raman swashs
Luminous power is greatly enhanced so that 1 rank raman pump power can transmit farther, reach L1+L2Place second it is described after
Hold remote gain unit 210.Thus, corresponding unrepeatered system transmission range improves L1+L2.Pass through this collocation method energy
It is enough that remote gain unit is delivered to the place more remote apart from multi-wavelength receiver, that is, accordingly increase the non-relay biography of multi-wavelength
The distance of defeated system.
As shown in figure 1, apart from multi-wavelength receiver fiber length it is L in main road transmission line1, L1+L2Etc. match somebody with somebody respectively
First rear end remote gain unit 210 and second rear end remote gain unit 210 are put, is connect in the multi-wavelength
The first rear end remotely pumping unit corresponding with first rear end remote gain unit 210 is respectively configured in receipts machine
220 and the second rear end remotely pumping unit 220 corresponding with second rear end remote gain unit 210
Deng.Wherein, the described first rear end remotely pumping unit 220, second rear end remotely pumping unit 220 and first
Fiber distance between the individual rear end remote gain unit 210 and second rear end remote gain unit 210 is respectively
L1, L1+L2.First rear end remotely pumping unit 220 is L by length1The rear end bypass fibers pumping source is given
Pumping is carried out to the described first rear end remote gain unit 210 and to it, second rear end remotely pumping unit
220 by length be L1+L2The rear end bypass fibers pumping source is delivered into the described second rear end remote gain unit
210。
It should be noted that second rear end remotely pumping unit 220 due to it by 1 rank pump laser and
2 rank pump lasers are formed, thus overcome the too high caused self-excitation of 1 rank Raman pump power in the rear end bypass optical fiber
Effect is penetrated, so as to which pump power is delivered to apart from the farther place of multi-wavelength receiver, that is, it is increased to reach transmission range
Purpose, and L2It is exactly increased transmission range.
With reference to shown in Fig. 3, the principle extended transmission distance to multi-wavelength repeatless transmission system provided by the utility model
Further illustrate.
The setting principle of remotely pumping unit is to be based on multiple Raman scattering, and Higher-order Raman effect is also referred to as multiple Raman and dissipated
Penetrate, i.e., the energy positioned at the high-power photon of high frequency can pass through Stokes shift for several times, step by step pumping low frequency photon.With two
Exemplified by the transfer of rank Raman pump power, second-order pump mode is exactly in conventional first order pump light（It is higher that frequency is added in 14XXnm)
Second-order pump（13XXnm）, existing single order pump light is amplified first, obtains some additional single order pump lights, is added
Pump light so as to flashlight（15XXnm）It is amplified, to obtain the signal of the signal power distribution being more uniformly distributed and Geng Gao
Power output.The distant pump amplification of high-order is similar with Higher-order Raman amplification principle, and exactly the pump wavelength of 1 rank is typically selected in erbium fibre
Near absorbing window 1480nm, the pumping wavelength of the corresponding distant pump of 2 rank is located near 1390nm.
For example, second rear end remotely pumping unit 220 is made up of 1 rank pumping source and 2 rank pumping sources, this combination
The shortcomings that 1 rank raman pump power that mode overcomes in bypass optical fiber can not be too high（1 rank pumping light power is too high to be exceeded
Raman lasing threshold, spontaneous emission noise will be caused in the range of signal spectrum, amplified signal will be interfered）.1 rank pumping
It is low, raman pump power can not be delivered to far place again, so 1 rank pump power is combined with 2 rank pump powers, entered simultaneously
Enter in optical fiber, 1 rank pump power can transmit while amplify in a fiber, can thus be sent to 1 rank pump power
Farther place, that is, reach the increased purpose of transmission range.Or with higher power when reaching gain module, in gain
Cause bigger gain in module, while 2 rank pumpings deliver to pump power apart from the farther place of multi-wavelength receiver, therefore
L2The transmission range exactly extended.
Preferably, the Insertion Loss of the rear end bypass fibers no more than the Transmission Fibers Insertion Loss, and by the rear end
Road fiber lengths are equal to the length of the corresponding Transmission Fibers.
It should be noted that the rear end bypass fibers can be different types with the transmission ray, for example, described
Rear end bypass fibers can bypass light with the small optical fiber of the small optical fiber of selecting unit loss distance or nonlinear factor, the rear end
Fibre can select the small optical fiber of Insertion Loss, although so its length is identical with the Transmission Fibers of main road, Insertion Loss is smaller, position
Pump light in the remotely pumping unit of the computer room of multi-wavelength receiver passes through the rear end bypass fibers transmission loss
Also it is small, the remaining pump power of remote gain unit is reached with regard to bigger, therefore larger pump power can is described remote
Higher gain is obtained in journey gain unit.
In addition, the rear end bypass fibers can also select nonlinear factor small, the big fiber type of effective area, so
Powerful pump light positioned at the remotely pumping unit of multi-wavelength receiver is reached being transferred to via bypass optical fiber
During the remote gain unit, the non-linear effects in bypass fibers are held in the rear with regard to smaller, it is non-linear to bring
System injury it is also small, thereby may be ensured that the remotely pumping unit can configure higher pump power, there is bigger pumping
Power is injected without causing transmission impairment in multi-wavelength receiver, and this is the pursued optimum target of transmission, so described in arrival
The pump power of remote gain unit also will be bigger, and bigger gain can be brought in gain unit.
Specifically, by the rear end for connecting first rear end remote gain unit and first rear end remotely pumping unit
The length L of road optical fiber1For 70 ~ 100km, second rear end remote gain unit and second rear end remotely pumping unit are connected
The length L of the rear end bypass fibers1+L2For 120 ~ 170km.
In order to realize transmission of the optical signal in the multi-wavelength repeatless transmission system, the multi-wavelength repeaterless transmission
System includes preamplifier, the output of the input of the preamplifier and the N-1 rear end remote gain unit
End connection, the output end of the preamplifier are connected with the input of the multi-wavelength receiver.
Specifically, it is described as shown in figure 1, the multi-wavelength repeatless transmission system includes the preamplifier 500
Preamplifier 500 can be amplified to the optical signal that enter the multi-wavelength receiver 200, in order to the multi-wavelength
Receiver 200 can recognize the optical signal.
As the embodiment of the multi-wavelength repeatless transmission system, in order to complete the non-relay biography of the multi-wavelength
The dispersion accumulation that Transmission Fibers are brought in defeated system, as shown in figure 1, the multi-wavelength repeatless transmission system 10 includes the first color
Dissipate the dispersion compensation unit 700 of compensating unit 600 and second；
The input of first dispersion compensation unit 600 is connected with the output end of the multi-wavelength emission machine 100, described
The output end of first dispersion compensation unit 600 is connected with the input of the erbium and ytterbium codoping high power light amplifier 400, and described
The optical signal that one dispersion compensation unit 600 can be sent to the multi-wavelength emission machine 100 carries out dispersion pre-compensation；
The input of second dispersion compensation unit 700 is connected with the output end of the preamplifier 500, and described
The output end of two dispersion compensation units 700 is connected with the input of the multi-wavelength receiver 100, the second dispersion compensation list
Member 700 can carry out dispersion compensation to transmitting to the optical signal before the multi-wavelength receiver 100.
It should be noted that first dispersion compensation unit 600 accounts for the 10 ~ 30% of the total compensation rate of dispersion, second color
Dissipate compensating unit 700 and account for the 70 ~ 90% of the total compensation rate of dispersion.First dispersion compensation unit 600 and second dispersion compensation
Unit 700 is grating type optical fiber, dispersion compensating fiber type or the dispersion compensation module based on other dispersion compensation principles.
It should be appreciated that the multi-wavelength emission machine 100 is by N number of transmitting terminal module composition, the tune of the transmitter module
Speed processed is 2.5G, 10G or 40G, and the transmitter module is made up of N number of super forward error correction FEC encoder, each superpower
Transceiver module in forward error correction FEC encoder is all with suppression Brillouin scattering（SBS）, SBS threshold brings up to 19dBm
More than.
It is to be further understood that the multi-wavelength emission machine 100 includes multiple transmission signals, each transmission signal
Wavelength meets ITU-T standard, and more than wavelength interval 50GHz, and number of wavelengths is more than 20.
It should be noted that the erbium and ytterbium codoping high power light amplifier 400 positioned at the multi-wavelength emission machine can provide
Power output more than 34dBm, than common erbium-doped fiber amplifier（Power output is not more than 27dBm) can provide it is higher
Power output.Therefore, the end of multi-wavelength emission machine 100 can be caused using the erbium and ytterbium codoping high power light amplifier 400
Optical signal transmission it is farther, so as to extend the transmission range of multi-wavelength repeatless transmission system.
As the embodiment of the erbium and ytterbium codoping image intensifer 400, the erbium and ytterbium codoping high power light amplifier
400 are typically made up of the seed source amplifier of prime and the power amplifier of rear class.The seed source amplifier of prime typically uses
Single mode Er-doped fiber as gain media, for by lower-powered transmission signal power from 0dBm or so lifted to 15dBm with
On, the power amplifier of rear class typically uses erbium ytterbium co doped double clad fiber as gain media, for by from seed source
Power is further promoted to more than 30dBm.
The multi-wavelength receiver 200 corresponding with the multi-wavelength emission machine is by N number of super error correction decoder and N number of connects
Module composition is received, wherein the speed of the receiving module needs and the speed of the transmitter module matches.
It should be appreciated that in the multi-wavelength emission machine 100, pass through multi-wavelength multiplex device（MUX）By different wave length
Light compositing into an optical fiber；And in the multi-wavelength receiver 200, pass through multi-wavelength demultiplexer（DEMUX）It will arrive
Separate up to the different wave length in the Transmission Fibers at the multi-wavelength receiver, assigned to according to wavelength in N number of receiving module.
It is to be further understood that the preamplifier 500 is used to that the small-signal of the multi-wavelength receiver 200 will to be reached
Further amplification, while the loss that multi-wavelength receiver compensating unit 700 below and Wave division multiplexer/demultiplexer are brought is compensated,
The signal power for ensureing to reach receiving terminal still is able to the sensitivity requirement for meeting the multi-wavelength receiver 200.
The operation principle of multi-wavelength repeatless transmission system provided by the utility model is described further, such as Fig. 2 institutes
Show, receiving terminal can further be extended transmission distance using cascade remote gain amplification system；Cascade remote gain amplification system
Comprising two rear end remote gain units, the two rear end remote gain units are placed on the diverse location in Transmission Fibers,
The two rear end remote gain units use different pump modes, wherein first rear end remote gain unit 210 be located at away from
From receiving terminal L1The place of distance, its pumping source be positioned at receiving terminal with great distance end-pumping source, by wavelength positioned at 1430 ~
Several semiconductor lasers near 1480nm are formed, between 1 ~ 1.5W of pumping general power.Pump power is to pass through transmission light
Fibre is delivered to gain fibre.Two effects are played with road remotely pumping：First, to Transmission Fibers L1Raman pump is provided,
Raman gain is produced in Transmission Fibers；Second, pass through Transmission Fibers L1Raman residue pump power is passed into first rear end
Remote gain unit 210, certain gain is produced in first rear end remote gain unit 210.
Second rear end remote gain unit 210 is located at apart from receiving terminal computer room L1+L2Place, its distal end pumping source is still
So it is located at receiving terminal computer room.Because second rear end remote gain unit 210 is farther from its pumping, so needing bigger pumping
Power.By the way of two directional pump, pumping is carried out to gain fibre respectively from the front and back of gain fibre.Pump light is
It is L by two segment length1+L2Bypass fibers transmission it is past.Loss of the loss of bypass fibers no more than transmission fiber end；
The small ultra-low-loss fiber of attenuation coefficient, or big, the small optical fiber of nonlinear factor from effective area can be selected in bypass fibers,
Or select has attenuation coefficient small and the big optical fiber of effective area simultaneously, such as：EX2000 optical fiber.L1+L2Length for 120 ~
170km；Between 1430 ~ 1480nm, pump power is generally between 1 ~ 1.5W its 1 rank pumping wavelength, and its 2 rank pumping wavelength is
Between 1360 ~ 1400nm, pump power is generally 2 ~ 5W.This remotely pumping source can be in second rear end remote gain unit
Larger erbium fibre gain is produced in 210, gain is generally between 15 ~ 25dB.Can be that second rear end is remote by two directional pump
Journey gain unit 210 provides higher pump power, improves the gain of second rear end remote gain unit 210.
Receiving terminal is made up of N number of super error correction decoder and N number of receiving module.The speed of receiving module needs and transmitting mould
The speed of block matches.MUX is multi-wavelength multiplex device, for by the light compositing of different wave length into an optical fiber；DEMUX is more
Wavelength demultiplexer, for the different wave length in the Transmission Fibers for reaching receiving terminal to be separated, N number of reception is assigned to according to wavelength
End.
Preamplifier is used to further amplify the small-signal for reaching receiving terminal, while compensates dispersion post-compensation below
The loss that module and Wave division multiplexer/demultiplexer are brought, the signal power for ensureing to reach receiving terminal still are able to the spirit for meeting receiver
Sensitivity requirement.
Multi-wavelength repeatless transmission system provided by the utility model, it is multiple by the multi-wavelength emission machine being sequentially connected, wavelength-division
With device, transmitter compensation unit, high power erbium and ytterbium codoping image intensifer, Transmission Fibers, remote gain unit, remotely pumping list
Member, demultiplexer, preamplifier, the receiver dispersion compensation unit and the multi-wavelength receiving mechanism are into by institute
To state multi-wavelength emission generator terminal and be provided with high power erbium and ytterbium codoping image intensifer so that the transmit power of transmitting terminal may be up to 34dBm,
Multistage remote gain unit is set by diverse location in the line, while phase therewith is configured in the multi-wavelength receiver end
The remotely pumping unit matched somebody with somebody, finally achieve over 500km multi-wavelength repeaterless transmission.In addition, the erbium ytterbium in the utility model
Being co-doped with image intensifer, not only power output can reach more than 34dBm, and not found in multi-wavelength emission generator terminal after entering optical fiber
Obvious non-linear phenomena.
It is understood that embodiment of above is merely to illustrate that principle of the present utility model and used exemplary
Embodiment, but the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case of the spirit and essence of utility model, various changes and modifications can be made therein, and these variations and modifications are also considered as this reality
With new protection domain.
Claims (10)
1. a kind of multi-wavelength repeatless transmission system, including multi-wavelength emission machine, multi-wavelength receiver and the connection multi-wavelength
The Transmission Fibers of emitter and the multi-wavelength receiver, the optical signal that the multi-wavelength emission machine is sent can be by the biographies
Lose fibre to transmit to the multi-wavelength receiver, it is characterised in that the multi-wavelength repeatless transmission system also includes：Erbium ytterbium is total to
Mix high power light amplifier, the output end of the input of the erbium and ytterbium codoping high power light amplifier and the multi-wavelength emission machine
Connection, the output end of the erbium and ytterbium codoping high power light amplifier are connected with the Transmission Fibers, the erbium and ytterbium codoping high power
Image intensifer can provide the power output more than 34dBm to lift the power for the optical signal that the multi-wavelength emission machine is sent,
The multi-wavelength emission machine includes the transmitter module for suppressing function with SBS, and one end of the multi-wavelength receiver also includes 2
Rear end remote gain unit, 2 rear end remotely pumping units and the connection rear end remote gain unit and the rear end are remote
The rear end bypass fibers of journey pump unit, the 1st rear end remote gain unit are arranged on apart from the multi-wavelength receiver
L1The position of length, the 2nd rear end remote gain unit are arranged on apart from the multi-wavelength receiver L1+L2The position of length
Put, and connect the rear end bypass fibers of the 1st rear end remote gain unit and the 1st rear end remotely pumping unit
Length is L1, the rear end for connecting the 2nd rear end remote gain unit and the 2nd rear end remotely pumping unit bypasses light
Fine length is L1+L2, 2 rear end remotely pumping units with the multi-wavelength receiver homonymy set；2nd rear end
The first input end of remote gain unit passes through the Transmission Fibers and the output end of the erbium and ytterbium codoping high power light amplifier
Connection, the second input of the 2nd rear end remote gain unit pass through the rear end bypass fibers and the 2nd rear end remotely pumping
Unit connects, and the output end of the 2nd rear end remote gain unit passes through the Transmission Fibers and the 1st rear end remote gain unit
First input end connection, the second input of the 1st rear end remote gain unit is defeated with the 1st rear end remotely pumping unit
Go out end to connect by the rear end bypass fibers, the output end of the 1st rear end remote gain unit by the Transmission Fibers and
The multi-wavelength receiver connection.
2. multi-wavelength repeatless transmission system according to claim 1, it is characterised in that the erbium and ytterbium codoping high power light
Amplifier is made up of the seed source amplifier of prime and the power amplifier of rear class, wherein the seed source amplifier of the prime by
Single mode Er-doped fiber is as gain media, for the power of transmission signal to be lifted at least 15dBm from 0dBm, the rear class
Power amplifier by erbium ytterbium co doped double clad fiber as gain media, after the seed source amplifier lifting by the prime
Transmission signal power further lifting arrive at least 30dBm.
3. multi-wavelength repeatless transmission system according to claim 1, it is characterised in that each rear end remote gain
Unit includes rear end Er-doped fiber, rear end wave multiplexer and rear end remote passive module,
The first input end of rear end wave multiplexer in each rear end remote gain unit is each rear end remote gain
The first input end of unit, each the second input of the rear end wave multiplexer in the rear end remote gain unit is each described
Second input of rear end remote gain unit, the output end of the rear end wave multiplexer in each rear end remote gain unit with
The input of rear end remote passive module in each rear end remote gain unit is connected by the rear end Er-doped fiber,
The output end of rear end remote passive module in each rear end remote gain unit is each rear end remote gain list
The output end of member.
4. multi-wavelength repeatless transmission system according to claim 3, it is characterised in that first rear end remotely pumping list
Member includes at least one single order Ramar laser, and second rear end remotely pumping unit includes at least one single order Ramar laser
With at least one second order Ramar laser.
5. multi-wavelength repeatless transmission system according to claim 4, it is characterised in that the single order Ramar laser with
The difference of the frequency of the second order Ramar laser is 13.2THz.
6. multi-wavelength repeatless transmission system according to claim 5, it is characterised in that the single order Ramar laser
Wave-length coverage is 1430 ~ 1480nm, and the wave-length coverage of the second order Ramar laser is 1360 ~ 1400nm.
7. multi-wavelength repeatless transmission system according to claim 2, it is characterised in that the rear end bypass fibers are inserted
The Insertion Loss no more than the Transmission Fibers is damaged, and the rear end bypass fibers length is equal to the corresponding Transmission Fibers
Length.
8. multi-wavelength repeatless transmission system according to claim 2, it is characterised in that first rear end of connection remotely increases
The length L of the rear end bypass fibers of beneficial unit and first rear end remotely pumping unit1For 70 ~ 100km, second is connected
The length L of the rear end bypass fibers of rear end remote gain unit and second rear end remotely pumping unit1+L2For 120 ~
170km。
9. multi-wavelength repeatless transmission system as claimed in any of claims 1 to 8, it is characterised in that described more
Wavelength repeatless transmission system includes preamplifier, and the input of the preamplifier remotely increases with the 1st rear end
The output end connection of beneficial unit, the output end of the preamplifier are connected with the input of the multi-wavelength receiver.
10. multi-wavelength repeatless transmission system according to claim 9, it is characterised in that the non-relay biography of multi-wavelength
Defeated system includes the first dispersion compensation unit and the second dispersion compensation unit；
The input of first dispersion compensation unit is connected with the output end of the multi-wavelength emission machine, and first dispersion is mended
The output end for repaying unit is connected with the input of the erbium and ytterbium codoping high power light amplifier, the first dispersion compensation unit energy
Enough optical signals sent to the multi-wavelength emission machine carry out dispersion pre-compensation；
The input of second dispersion compensation unit is connected with the output end of the preamplifier, second dispersion compensation
The output end of unit is connected with the input of the multi-wavelength receiver, and second dispersion compensation unit can be to transmitting to institute
State the optical signal before multi-wavelength receiver and carry out dispersion compensation.
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| CN201720793407.3U CN207135105U (en) | 2017-07-03 | 2017-07-03 | A kind of multi-wavelength repeatless transmission system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181529A (en) * | 2017-07-03 | 2017-09-19 | 无锡市德科立光电子技术有限公司 | A kind of multi-wavelength repeatless transmission system |
| CN112953640A (en) * | 2021-01-18 | 2021-06-11 | 中国南方电网有限责任公司超高压输电公司 | Cascade remote pump amplification system, remote gain unit and signal light amplification method |
| CN113310565A (en) * | 2021-05-25 | 2021-08-27 | 武汉光迅科技股份有限公司 | Ultra-long distance distributed optical fiber vibration sensing system and method |
| US11641246B2 (en) | 2018-12-29 | 2023-05-02 | Huawei Technologies Co., Ltd. | Optical switching apparatus and system, and power calculation method |
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2017
- 2017-07-03 CN CN201720793407.3U patent/CN207135105U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181529A (en) * | 2017-07-03 | 2017-09-19 | 无锡市德科立光电子技术有限公司 | A kind of multi-wavelength repeatless transmission system |
| US11641246B2 (en) | 2018-12-29 | 2023-05-02 | Huawei Technologies Co., Ltd. | Optical switching apparatus and system, and power calculation method |
| CN112953640A (en) * | 2021-01-18 | 2021-06-11 | 中国南方电网有限责任公司超高压输电公司 | Cascade remote pump amplification system, remote gain unit and signal light amplification method |
| CN113310565A (en) * | 2021-05-25 | 2021-08-27 | 武汉光迅科技股份有限公司 | Ultra-long distance distributed optical fiber vibration sensing system and method |
| CN113310565B (en) * | 2021-05-25 | 2023-12-01 | 武汉光迅科技股份有限公司 | Ultra-long distance distributed optical fiber vibration sensing system and method |
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Address after: 214028 plot 93-c, science and Technology Industrial Park, Xinwu District, Wuxi City, Jiangsu Province Patentee after: Wuxi dekeli Optoelectronic Technology Co.,Ltd. Address before: 214028 plot 93-c, science and Technology Industrial Park, Xinwu District, Wuxi City, Jiangsu Province Patentee before: WUXI TACLINK OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |