CN102893544B - A kind of optical amplification device, method and passive optical network and equipment - Google Patents
A kind of optical amplification device, method and passive optical network and equipment Download PDFInfo
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- CN102893544B CN102893544B CN201180001862.0A CN201180001862A CN102893544B CN 102893544 B CN102893544 B CN 102893544B CN 201180001862 A CN201180001862 A CN 201180001862A CN 102893544 B CN102893544 B CN 102893544B
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
A kind of optical amplification device, comprises mixed light signal synthesizer, for receiving burst luminous signal and continuous light signal, and by described burst luminous signal and continuous light signal syntheses mixed light signal; Erbium-doped fiber amplifier, amplifies for the mixed light signal exported described mixed light signal synthesizer; Wherein, continuous light signal in described mixed light signal, for consuming the partial inversion particle of described erbium-doped fiber amplifier, makes the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the burst luminous signal in described mixed light signal maintain poised state.A kind of method of light amplification and passive optical network and equipment are also provided.
Description
Technical field
The present invention relates to Access Network field, particularly relate to a kind of optical amplification device, method and EPON (Passive Optical Network, PON) system and equipment.
Background technology
At present, PON technology is through development for many years, and gradually ripe, it, with cheap cost, huge bandwidth capacity, is widely used in Access Network field.
PON system generally comprises an optical line terminal (Optical Line Terminal, OLT), an optical distribution network (Optical Distribution Network for branch/coupling or multiplex/demultiplex, and several optical network units (Optical Network Unit, ONU) ODN).Typical ethernet passive optical network (Ethernet Passive Optical Network, and Gigabit Passive Optical Network (Gigabit-CapablePON EPON), GPON) transmission range is 20Km to the maximum, adopt tree topology, downlink data uses broadcast transmission, and upstream data uses time division multiplexing mode transmission.
Along with the increase day by day of bandwidth demand, the growth rate of network cost is far above the growth rate of bandwidth, and the profit margin of operator is compressed continuously.Extend the coverage distance of PON, increase the branching ratio that PON system can be supported, make PON can support more user, then share and will effectively reduce to the network cost of each user, this becomes a kind of trend of PON development gradually.The topmost feature of PON technology, be that its ODN part uses passive device, make maintenance cost very cheap, but be limited to the utilizing emitted light power of light emitting devices and the receiving sensitivity of light receiving element, the transmission range of EPON and GPON of current commercialization is limited in 20Km, and branching ratio is limited within 1: 32.
In order to improve system power budget, in PON system, add image intensifer is a comparatively simple and direct approach.Simultaneously in order to keep the sourceless characteristic of ODN network in PON system and reduce the cost of ONU end, can by image intensifer centre local side.In optical communication link, erbium-doped fiber amplifier (Erbium DopedFiber Amplifier, EDFA) is a kind of conventional image intensifer.EDFA has good gain characteristic at 1550nm wave band, and noiseproof feature is more outstanding, but its response for burst luminous signal exists surge effect as described below.
The surge effect of EDFA is determined by its operation principle, and the erbium ion in optical fiber transits to pumping state (life-span 1us) under the effect of pump light, and then relax to metastable state in Henan rapidly; Under pumping endlessly, metastable particle gets more and more, thus realizes population inversion; When light signal by time, metastable particle stimulated radiation transits to ground state, discharges a photon identical with light signal simultaneously, realizes light amplification.Under outburst surroundings, when not having light signal to input, the inverted population of EDFA is through accumulation for a long time, and gain is larger.When burst luminous signal arrives out of the blue, consume rapidly reversion particle, until the generation of reversion particle and consume and again reach balance and enter steady-working state, therefore, also there is a stable process in the gain of EDFA.As shown in Figure 1, Fig. 1 a is the burst luminous signal of input EDFA, and Fig. 1 b is the output optical signal after EDFA amplifies.Can find out, when burst luminous signal arrives, because the gain of EDFA can not suddenly change, the front-end gain of bursty data is comparatively large, thus causes the distortion of data-signal.Therefore, above-mentioned EDFA surge effect easily causes system error code, deteriorating process performance.
Summary of the invention
The object of this invention is to provide a kind of optical amplification device, method and PON system, there is surge effect problem to solve prior art EDFA and cause the problem of system performance degradation due to surge effect.
On the one hand, provide a kind of optical amplification device, described optical amplification device comprises: mixed light signal synthesizer, for receiving burst luminous signal and continuous light signal, and by described burst luminous signal and continuous light signal syntheses mixed light signal; Erbium-doped fiber amplifier, amplifies for the mixed light signal exported described mixed light signal synthesizer; Wherein, continuous light signal in described mixed light signal, for consuming the partial inversion particle of described erbium-doped fiber amplifier, makes the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the burst luminous signal in described mixed light signal maintain poised state.
On the other hand, provide a kind of optical line terminal, described optical line terminal comprises: transmitter, for launching descending continuous light signal; Optical amplification device, for descending continuous light signal that described transmitter is launched and the uplink burst light signal synthesis mixed light signal from Optical Distribution Network, and by erbium-doped fiber amplifier, described mixed light signal is amplified, wherein, continuous light signal in described mixed light signal, for consuming the partial inversion particle of described erbium-doped fiber amplifier, makes the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the uplink burst light signal in described mixed light signal maintain poised state; Receiver, for receiving the uplink burst light signal in the mixed light signal that amplifies through described erbium-doped fiber amplifier.
On the other hand, a kind of passive optical network is provided, described system comprises optical line terminal and multiple optical network unit, described optical line terminal is connected to described multiple optical network unit by Optical Distribution Network, the descending continuous light Signal transmissions that described optical line terminal is used for described optical line terminal to export is to described multiple optical network unit, and the uplink burst optical signal transmission exported by described multiple optical network unit is to described optical line terminal, wherein said optical line terminal is optical line terminal as above.
Again on the one hand, provide a kind of method of light amplification, described method comprises: receive burst luminous signal and continuous light signal, and by described burst luminous signal and continuous light signal syntheses mixed light signal; Erbium-doped fiber amplifier is utilized to amplify described mixed light signal, continuous light signal in wherein said mixed light signal, for consuming the partial inversion particle of described erbium-doped fiber amplifier, makes the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the burst luminous signal in described mixed light signal maintain poised state.
In embodiments of the present invention, by by burst luminous signal and continuous light signal syntheses mixed light signal, by erbium-doped optical fiber amplifier EDFA, this mixed light signal is amplified again, because the inverted population major part of EDFA is by descending continuous light signal losses, maintain a poised state; When burst luminous signal injects EDFA, the poised state of inverted population only continuous light signal set up produce one can be very small disturbance, do not cause the sudden change of charge carrier, surge effect when therefore can effectively suppress EDFA to amplify for burst luminous signal, solves because EDFA surge effect causes the problem of system performance degradation.
Accompanying drawing explanation
Fig. 1 a is the schematic diagram of burst luminous signal;
Fig. 1 b is the schematic diagram of burst luminous signal shown in Fig. 1 a after existing EDFA amplifies;
The structured flowchart of the optical amplification device that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the structural representation of optical amplification device provided by the invention PON system applicatory;
Fig. 4 is applied in the structured flowchart of the optical line terminal of PON system for optical amplification device that first embodiment of the invention provides;
Fig. 5 is applied in the structured flowchart of the optical line terminal of PON system for optical amplification device that second embodiment of the invention provides;
The realization flow figure of the method for light amplification that Fig. 6 provides for the embodiment of the present invention;
Fig. 7 is applied in the realization flow figure of the optical line terminal of PON system for method of light amplification that first embodiment of the invention provides;
Fig. 8 is applied in the realization flow figure of the optical line terminal of PON system for method of light amplification that second embodiment of the invention provides.
Embodiment
In optical amplification device of the present invention, by mixed light signal synthesizer by burst luminous signal and continuous light signal syntheses mixed light signal, by erbium-doped optical fiber amplifier EDFA, this mixed light signal is amplified again, because the power of the continuous light signal in mixed light signal is larger relative to the power of burst luminous signal, the inverted population major part of EDFA, by continuous light signal losses, maintains a poised state; When burst luminous signal injects EDFA, burst luminous signal only can to the poised state of inverted population produce one can be very small disturbance, do not cause the sudden change of charge carrier, surge effect when therefore can effectively suppress EDFA to amplify for burst luminous signal, solves because EDFA surge effect causes the problem of system performance degradation.
Fig. 2 shows the structured flowchart of optical amplification device provided by the invention, for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, and in the present embodiment, this optical amplification device comprises: mixed light signal synthesizer 210 and erbium-doped fiber amplifier 220.
Wherein, mixed light signal synthesizer 210, for receiving burst luminous signal and continuous light signal, by described burst luminous signal and continuous light signal syntheses mixed light signal, and exports described mixed light signal to erbium-doped fiber amplifier 220;
Erbium-doped fiber amplifier 220 is for amplifying the mixed light signal received from described mixed light signal synthesizer 210.
Such as, described burst luminous signal and continuous light signal can have different wavelength, and described mixed light signal synthesizer 210 can synthesize described mixed light signal by the mode of the burst luminous signal of described different wave length and continuous light signal being carried out wavelength division multiplexing.Or, described continuous light signal also can be exported to the output channel of described burst luminous signal by described mixed light signal synthesizer 210, thus makes the output light of the output channel of described burst luminous signal be the mixed light signal of described burst luminous signal and described continuous light signal.
In the above-described embodiments, the power of the continuous light signal that described mixed light signal synthesizer 210 receives is greater than the power of described burst luminous signal, therefore the continuous light signal in described mixed light signal can consume the partial inversion particle of described erbium-doped fiber amplifier 220, make the reversion particle in described erbium-doped fiber amplifier 220 maintain poised state, thus suppress it amplifying issuable surge effect to described uplink burst light signal.
The optical amplification device that the embodiment of the present invention provides is applicable to EPON (PON) system as shown in Figure 3.Refer to Fig. 3, described passive optical network can comprise at least one optical line terminal (OLT), multiple optical network unit (ONU) and an Optical Distribution Network (ODN).Described OLT is connected to described multiple ONU by described ODN with point-to-multipoint form.Wherein, the direction from described OLT to described ONU is defined as down direction, and is defined as up direction from described ONU to the direction of described OLT.At down direction, described OLT adopts time division multiplexing (Time Division Multiplexing, TDM) mode downlink data to be broadcast to described multiple ONU, and each ONU receives only the data of carrying self identification; And at up direction, described multiple ONU adopts the mode of time division multiple access (Time Division Multiple Access, TDMA) to communicate with described OLT, the time slot that each ONU distributes in strict accordance with described OLT sends upstream data.Adopt above-mentioned mechanism, the downlink optical signal that described OLT sends is continuous light signal; And the uplink optical signal that described ONU sends is burst luminous signal.
Described passive optical network can be without any need for active device to realize the communications network system of the Data dissemination between described OLT and described ONU, such as, in a particular embodiment, the Data dissemination between described OLT and described ONU can be realized by the Passive Optical Components (such as optical splitter) in described ODN.And, described passive optical network 100 can be ITU-T G.983 asynchronous transfer mode EPON (ATM PON) system of standard definition or broadband passive optical network (BPON) system, ITU-T G.984 gigabit passive optical network (GPON) system of standard definition, the Ethernet passive optical network (EPON) of IEEE 802.3ah standard definition or next-generation passive optical network (NGA PON, such as XGPON or 10G EPON etc.).The full content of the various passive optical networks of above-mentioned standard definition is combined in present specification by reference.
Described OLT is usually located at central office (Central Office, CO), and it can multiple ONU described in unified management, and transmits data between described ONU and upper layer network (not shown).Specifically, this OLT can serve as described ONU and described upper layer network (such as internet, PSTN (PublicSwitched Telephone Network, PSTN) medium), by the data retransmission that receives from described upper layer network to described ONU, and by the data retransmission that receives from described ONU to described upper layer network.The concrete structure configuration of described OLT may be different because of the particular type of described EPON 100, such as, in one embodiment, described OLT can comprise transmitter and receiver, described transmitter is used for sending descending continuous light signal to described ONU, described receiver is for receiving the uplink burst light signal from described ONU, and wherein said downlink optical signal and uplink optical signal transmit by described Optical Distribution Network.
Described ONU can be arranged on user's side position (such as user resident) in a distributed manner.Described ONU can for for carrying out with described OLT and user the network equipment that communicates, specifically, described ONU can serve as the medium between described OLT and described user, such as, described ONU can by the data retransmission that receives from described OLT to described user, and by the data retransmission that receives from described user to described OLT.Should be appreciated that the structure of described ONU is close with Optical Network Terminal (Optical Network Terminal, ONT), in the scheme therefore provided in present specification, can exchange between optical network unit and Optical Network Terminal.
Described ODN can be a data distribution systems, and it can comprise optical fiber, optical coupler, optical branching device and/or other equipment.In one embodiment, described optical fiber, optical coupler, optical branching device and/or other equipment can be Passive Optical Components, specifically, described optical fiber, optical coupler, optical branching device and/or other equipment can be that distribute data signals is the device not needing power supply to support between described OLT and described ONU.In addition, in other embodiments, this ODN can also comprise one or more treatment facility, such as, and image intensifer or trunking (Relay device).In addition, described ODN specifically can extend to described multiple ONU from described optical line terminal 110, but also can be configured to other any point-to-multipoint structures.
As one embodiment of the present of invention, described optical amplification device can be applied in local side optical line terminal in PON system, wherein, described continuous light signal can be the descending continuous light signal that the transmitter of optical line terminal exports, and described burst luminous signal can be the uplink burst light signal that optical network unit sends, and the wavelength of described descending continuous light signal and described uplink burst light signal can be different.
In one embodiment, described optical line terminal can adopt same optical amplification device to realize the amplification of uplink burst light signal and descending continuous light signal.Refer to Fig. 4, described optical line terminal can comprise transmitter 11, optical amplification device 13, Wave decomposing multiplexer part 17, receiver 14 and optical routing device 15.
Wherein, the transmitter 11 of optical line terminal is for exporting descending continuous light signal to described optical amplification device 13.
Optical amplification device 13 can be amplified uplink burst light signal and descending continuous light signal and effectively suppress EDFA for the surge effect of burst luminous signal by erbium-doped optical fiber amplifier EDFA, it can adopt optical amplification device as shown in Figure 2, such as, described optical amplification device 13 can comprise mixed light signal synthesizer 131 and erbium-doped fiber amplifier 132.
Mixed light signal synthesizer 131 can comprise wavelength division multiplex device 141, this wavelength division multiplex device 141 for the uplink burst light signal received from optical routing device 15 with carry out wavelength division multiplexing from the descending continuous light signal that transmitter 11 receives thus realize signal mixing, and transmits multiplexing optical signal (i.e. mixed light signal) that wavelength division multiplexing obtains to erbium-doped fiber amplifier 132.
Wherein, described wavelength division multiplex device 141 can comprise first input end mouth, the second input port and output port, wherein said first input end mouth is connected to transmitter 11, described second input port is connected to optical routing device 15, and described output port is connected to erbium-doped fiber amplifier 132.Described descending continuous light signal is the first input end mouth that the transmitter 11 of optical line terminal exports wavelength division multiplex device 141 to, described uplink burst light signal is that optical routing device 15 receives from Optical Distribution Network (not shown) and routes to the second input port of wavelength division multiplex device 141, and described multiplexing optical signal transfers to erbium-doped fiber amplifier 132 by the output port of wavelength division multiplex device 141.
Erbium-doped fiber amplifier 132 is for amplifying the multiplexing optical signal that input light carries out wavelength division multiplexing formation the wavelength division multiplex device 141 in described mixed light signal synthesizer 131, and export the multiplexing optical signal after amplifying to Wave decomposing multiplexer part 17, the multiplexing optical signal synthesized due to wavelength division multiplex device 141 comprises descending continuous light signal and uplink burst light signal, wherein descending continuous light signal is continued presence, therefore descending continuous light signal can consume the reversion particle of most of erbium-doped fiber amplifier 132, the reversion particle of erbium-doped fiber amplifier 132 is made to maintain a poised state, when uplink burst light signal be injected into erbium-doped fiber amplifier 132 amplify time, the reversion particle of described maintenance poised state can not cause charge carrier to suddenly change, thus suppresses surge effect, solves because EDFA surge effect causes the problem of system performance degradation.
Wave decomposing multiplexer part 17 can comprise input port, the first output port and the second output port, wherein said input port is connected to optical amplification device 15, described first output port is connected to optical routing device 15, and described second output port is connected to receiver 14.Described Wave decomposing multiplexer part 17 may be used for receiving by input port the multiplexing optical signal exported by optical amplification device 13, and it is multiplexing to carry out Wave Decomposition to this multiplexing optical signal, thus the descending continuous light signal obtained after amplifying and uplink burst light signal, and by the receiver 14 of descending continuous light signal to optical line terminal passing through amplification that the second output port output demultiplexing obtains, the uplink burst light signal through amplification obtained by the first output port output demultiplexing is to optical routing device 15.
Optical routing device 15 can be three port optical routers parts, it comprises the first port, second port and the 3rd port, wherein said first port is connected to Wave decomposing multiplexer part 17, described second port is connected to optical amplification device 15, described 3rd port is connected to Optical Distribution Network, described optical routing device 15 may be used for the descending continuous light signal through amplifying obtained by the first port accepts Wave decomposing multiplexer part 17 demultiplexing, and export this descending continuous light signal to Optical Distribution Network by the 3rd port, utilize the uplink burst light signal that the 3rd port accepts optical network unit transmits through Optical Distribution Network simultaneously, and by the second port, this uplink burst light signal is supplied to wavelength division multiplex device 141.
In the present embodiment, the effect of this optical routing device 15 is that descending continuous light signal is forwarded to optical distribution network, and the uplink burst light signal from optical distribution network is forwarded to wavelength division multiplex device 141, and what in fact play a part is an optical routing.In a particular embodiment, because descending continuous light signal is different with the wavelength of uplink burst light signal, and the trunk optical fiber that this descending continuous light signal and up continuous light signal can be carried on Optical Distribution Network transmits simultaneously, optical routing device 15 can be wave band multiplex/demultiplex device, or, in other alternate embodiments, described optical routing device 15 also can adopt circulator to realize.
Further, in one embodiment, alternatively, described optical line terminal also can comprise optical isolator 12 further, it is connected between described optical amplification device 13 and Wave decomposing multiplexer part 17, optical isolator 12 is used for intercepting the light signal that Wave decomposing multiplexer part 17 reflects and enters erbium-doped fiber amplifier 132, affects the amplification process of burst luminous signal.
In another kind of embodiment, described optical line terminal can also adopt different optical amplification devices to carry out the method for descending continuous light signal and uplink burst light signal respectively.Refer to Fig. 5, described optical line terminal can comprise transmitter 21, continuous light amplifier 22, optical amplification device 23 and receiver 26.
Wherein, the transmitter 21 of optical line terminal is for exporting descending continuous light signal to continuous light amplifier 22.
Continuous light amplifier 22 amplifies for the descending continuous light signal launched the transmitter 21 from described optical line terminal, and exports the descending continuous light signal after amplifying to optical amplification device 23; Particularly, described continuous light amplifier 22 can adopt erbium-doped optical fiber amplifier EDFA.
Described optical amplification device 23 can adopt EDFA amplify uplink burst light signal and effectively suppress EDFA to the surge effect of burst luminous signal, it can employing optical amplification device as shown in Figure 2, such as, described optical amplification device 23 can comprise mixed light signal synthesizer 231 and erbium-doped fiber amplifier 232.
Described mixed light signal synthesizer 231 can comprise optical routing device 251 and partially reflecting mirror 252 (Partial reflection Mirror, PM).
Wherein, optical routing device 251 can be three port optical routers parts, it comprises the first port, the second port and the 3rd port, wherein said first port is connected to erbium-doped fiber amplifier 232, described second port is connected to continuous light amplifier 22, and described 3rd port is connected to Optical Distribution Network (not shown) by partially reflecting mirror 252.The descending continuous light signal that described optical routing device 251 can be amplified through described continuous light amplifier 22 by described second port accepts, and by described 3rd port, the described descending continuous light signal through amplifying is exported descending continuous light signal to partially reflecting mirror 252; Further, described uplink burst light signal by the uplink burst light signal of described 3rd port accepts from Optical Distribution Network, and can also be exported to erbium-doped fiber amplifier 232 by described first port by described optical routing device 251.
Partially reflecting mirror 252 carries out part reflection for the descending continuous light signal exported described optical routing device 251, in the present embodiment, the wherein a part of in the descending continuous light signal amplified of optical routing device 251 the 3rd port output exports Optical Distribution Network to through described partially reflecting mirror 252, another part is reflected back described optical routing device 251 by described partially reflecting mirror 252, the reflected signal of this descending continuous light signal formed thus is back to optical routing device 251, and described reflected signal is also continuous light signal.
The reflected signal of the descending continuous light signal that described 3rd port accepts can arrive by optical routing device 251 and uplink burst light signal synthesis mixed light signal, such as, the reflected signal of described descending continuous light signal can be provided to the output channel of described uplink burst light signal by optical routing device 251, thus obtain the mixed light signal of described reflected signal and uplink burst light signal in the output channel of described uplink burst light signal, and pass through described first port by described mixed light Signal transmissions to erbium-doped fiber amplifier 232.Similar with previous embodiment, described optical routing device 251 also can be wave band multiplex/demultiplex device WDM or circulator.
Erbium-doped fiber amplifier 232 is for amplifying the mixed light signal exported from optical routing device 251, and the uplink burst light signal in the mixed light signal amplified is provided to receiver 26 through a step.
In the present embodiment, owing to being comprised reflected signal and the uplink burst light signal of descending continuous light signal by the first end port transmission of optical routing device 251 to the mixed signal of erbium-doped fiber amplifier 232, wherein the reflected signal of descending continuous light signal is continued presence, and power is much larger than the power of uplink burst light signal, therefore the reflected signal of described descending continuous light signal can consume the reversion particle of most of erbium-doped fiber amplifier 232, makes the reversion particle of erbium-doped fiber amplifier 232 maintain a poised state; When uplink burst light signal be injected into erbium-doped fiber amplifier 232 amplify time, the reversion particle of described maintenance poised state can not cause charge carrier to suddenly change, thus suppresses surge effect, solves because EDFA surge effect causes the problem of system performance degradation.
In one embodiment, alternatively, described optical line terminal also can comprise the first optical isolator 24 further, it is connected between described optical amplification device 23 and descending continuous light amplifier 22, and the reverberation formed after described optical routing device 251 reflects for the descending continuous light signal after the amplification to descending continuous light amplifier 22 output carries out isolation processing.Alternatively, described optical line terminal also can comprise the second optical isolator 25 further, it is coupling between described optical amplification device 23 and receiver 26, for carrying out isolation processing to the reflected signal in the mixed light signal after the amplification exported from optical amplification device 23, it is avoided to affect the reception of receiver 26 pairs of uplink burst light signals.
Based on above-mentioned optical amplification device, the embodiment of the present invention also provides a kind of method of light amplification further.Fig. 6 shows the realization flow of method of light amplification provided by the invention, and described method of light amplification can comprise:
In step s 601, receive burst luminous signal and continuous light signal, and by described burst luminous signal and continuous light signal syntheses mixed light signal;
Described mixed light signal comprises described burst luminous signal and described continuous light signal.Such as, described burst luminous signal and continuous light signal can have different wavelength, and can synthesize described mixed light signal by the mode of the burst luminous signal of described different wave length and continuous light signal being carried out wavelength division multiplexing in step S601.Or, in institute step S601, also described continuous light signal can be exported to the output channel of described burst luminous signal, thus make the output light of the output channel of described burst luminous signal be the mixed light signal of described burst luminous signal and described continuous light signal.
In step S602, erbium-doped fiber amplifier is utilized to amplify described mixed light signal.Wherein, continuous light signal in described mixed light signal can consume the partial inversion particle of described erbium-doped fiber amplifier, make the reversion particle in described erbium-doped fiber amplifier maintain poised state, thus suppress it amplifying issuable surge effect to described uplink burst light signal.
As one embodiment of the present of invention, described method of light amplification can be applied in local side optical line terminal in PON system, than optical line terminal as shown in Figure 4 and Figure 5.Wherein, described continuous light signal can be the descending continuous light signal that the transmitter of optical line terminal exports, and described burst luminous signal can be the uplink burst light signal that optical network unit sends.
Below in conjunction with the embody rule example of two in PON system, introduce the specific implementation process of the method for light amplification that the embodiment of the present invention provides in detail.
Fig. 7 shows the realization flow of the method for light amplification that first embodiment of the invention provides, and described method of light amplification can comprise:
In step S700, optical routing device receives uplink burst light signal from Optical Distribution Network and is transmitted to mixed light signal synthesizer, and transmitter launches descending continuous light signal to mixed light signal synthesizer.
Wherein, uplink burst light signal can be provided by user's sidelight network element, and exports local side optical line terminal to by Optical Distribution Network, and is transmitted to described mixed light signal synthesizer by described optical routing device; Descending continuous light signal can be directly export described mixed light signal synthesizer to by the transmitter of optical line terminal inside.Described uplink burst light signal and described descending continuous light signal have different wavelength.
In step s 701, mixed light signal synthesizer carries out wavelength division multiplexing by wavelength division multiplex device to uplink burst light signal and descending continuous light signal, and transmits the multiplexing optical signal after wavelength division multiplexing to erbium-doped fiber amplifier.
In the present embodiment, the first input end mouth of wavelength division multiplex device receives the descending continuous light signal of the transmitter transmission of optical line terminal, and the second input port receives the uplink burst light signal forwarded by optical routing device.Wavelength division multiplex device carries out wavelength division multiplexing by the uplink burst light signal received by the second input port with by the descending continuous light signal that first input end mouth receives, and by the multiplexing optical signal after output port transmission wavelength division multiplexing to erbium-doped optical fiber amplifier EDFA.
In step S702, described erbium-doped fiber amplifier amplifies the uplink burst light signal in described multiplexing optical signal and descending continuous light signal, and the multiplexing optical signal after transmission amplification is to Wave decomposing multiplexer part.
In the present embodiment, erbium-doped fiber amplifier amplifies the wavelength-division-multiplexed optical signal received, and the multiplexing optical signal after transmission amplification is to Wave decomposing multiplexer part, receives the multiplexing optical signal after this amplification by the input port of Wave decomposing multiplexer part.In actual applications, in order to support the passive optical network PON of long distance, large branching ratio, keep the sourceless characteristic of optical distribution network ODN, uplink burst light signal, in transmitting procedure, does not carry out relaying amplification simultaneously.Therefore, uplink burst light signal arrives optical line terminal through transmission, and luminous power is fainter, commonly uses the sensitivity of receiver well below Access Network.Therefore, in order to meet the requirement of receiver, before entering receiver, adding erbium-doped optical fiber amplifier EDFA and burst amplification is carried out to uplink burst light signal.Equally, descending continuous light signal, before entering transmission, also will use erbium-doped optical fiber amplifier EDFA to carry out power back-off to descending continuous light signal; Because descending continuous light signal is not depleted, therefore the luminous power of descending continuous light signal is the transmitting power of the transmitter of optical line terminal, is far longer than the luminous power reaching the uplink burst light signal that optical line terminal receives.
For these reasons, in the present embodiment, adopt same erbium-doped fiber amplifier to amplify up-downgoing light signal simultaneously, in amplification process, because descending continuous light signal exists always, and power is comparatively large relative to uplink burst light signal, cause the inverted population of erbium-doped fiber amplifier major part consume by descending continuous light signal, maintain a poised state; When uplink burst light signal injects erbium-doped fiber amplifier simultaneously, the power of this uplink burst light signal is very little, only producing one to the poised state of the inverted population that descending continuous light signal is set up can the disturbance of very small (can ignore), do not cause the sudden change of charge carrier, therefore can effectively suppress erbium-doped optical fiber amplifier EDFA for surge effect during uplink burst optical signal amplification.Therefore, in erbium-doped optical fiber amplifier EDFA, the existence of descending continuous light signal, amplifies the EDFA of uplink burst light signal and plays gain blocked effect, solves because EDFA surge effect causes the problem of system performance degradation.
In step S703, described Wave decomposing multiplexer part carries out demultiplexing to the multiplexing optical signal after described amplification, obtain the uplink burst light signal through amplifying and descending continuous light signal, and transmit described uplink burst light signal through amplifying and descending continuous light signal respectively to the receiver of optical line terminal and described optical routing device.
In the present embodiment, multiplexing optical signal through amplifying is output to the input port of Wave decomposing multiplexer part, it is multiplexing that Wave decomposing multiplexer part carries out Wave Decomposition to the multiplexing optical signal that this process is amplified, obtain the uplink burst light signal through amplifying and descending continuous light signal, and be transferred through the descending continuous light signal of amplification to optical routing device by the first output port, the receiver of uplink burst light signal to optical line terminal passing through amplification obtained by the second output port transmission.
In step S704, optical routing device exports the descending continuous light signal through amplifying to Optical Distribution Network.
In addition, in this method embodiment, erbium-doped optical fiber amplifier EDFA is EDFA commercial at present.Device used in this method, comprise erbium-doped optical fiber amplifier EDFA, optical isolator, optical routing device and for the wavelength division multiplex device of burst luminous signal and continuous light signal multiplexing and demultiplexing and Wave decomposing multiplexer part, all be placed on the optical line terminal of central office side, wherein, optical routing device can be wavelength division multiplexing or demultiplexing device, also can be circulator.In addition, in PON system, uplink burst light signal and descending continuous light signal can use the different wave length of C-band, to make full use of EDFA in the excellent advantage of C-band gain characteristic.
Fig. 8 shows the realization flow of the method for light amplification that second embodiment of the invention provides, and described method of light amplification can comprise:
In step S801, continuous light amplifier amplifies the descending continuous light signal that the transmitter of optical line terminal is launched, and exports the descending continuous light signal after amplifying to optical routing device.
In step S802, optical routing device exports described descending continuous light signal to Optical Distribution Network through partially reflecting mirror.
In the present embodiment, before this descending continuous light signal enters Optical Distribution Network, be introduced into partially reflecting mirror PM, wherein, the descending continuous light signal of 3%-15% is reflected back toward optical routing device.
In step S803, optical routing device receives the reflected signal of the descending continuous light signal returned by partially reflecting mirror, and receives the uplink burst light signal provided by optical network unit from Optical Distribution Network.
In step S804, optical routing device exports the reflected signal of described descending continuous light signal the output channel of described uplink burst light signal to, thus the uplink burst light signal in described reflected signal and described passage is synthesized mixed light signal, and export erbium-doped fiber amplifier to.
In the present embodiment, at least large than the power of the uplink burst light signal in this passage 10dB of power of the reflection crosstalk optical signal of the descending continuous light signal of the uplink burst light signal output channel of optical routing device is entered through crosstalk.
In the present embodiment, before descending continuous light signal enters Optical Distribution Network transmission, can select the partially reflecting mirror of 10% luminous power, like this, the luminous power of the descending continuous light signal of 10% is partially reflected mirror reflected light route device.This optical routing device can be wave band multiplex/demultiplex device, also can be circulator, when this optical routing device is circulator, then the reflected signal of descending continuous light signal that partially reflecting mirror is reflected back all exports the output channel of described uplink burst light signal to; If this optical routing device is wave band multiplex/demultiplex device, then due to the existence of the isolation of wave band multiplex/demultiplex device, then described reflected signal only can by the output channel partly entering described uplink burst light signal.The wave band multiplex/demultiplex device isolation of current commercialization is generally 25dB, then the power entering the reflected signal of uplink burst photo-signal channel is about-20dBm (15dBm-10dB-25dB).
In step S805, erbium-doped fiber amplifier amplifies the mixed light signal exported from described uplink burst light signal output channel, and exports the uplink burst light signal in the mixed light signal after amplifying the receiver of optical line terminal to.
In the present embodiment, erbium-doped fiber amplifier amplifies the mixed light signal exported from uplink burst light signal output channel, and therefore, the reflected signal of this descending continuous light signal enters erbium-doped fiber amplifier and amplifies together with uplink burst light signal.The power of uplink burst light signal light is still very little relative to reflected signal, therefore, the inverted population of described erbium-doped fiber amplifier major part consume by the reflected signal of descending continuous light signal, thus maintain a poised state; When uplink burst light signal injects erbium-doped fiber amplifier simultaneously, the sudden change of charge carrier can not be caused, visible, described reflected signal can amplify and can play the effect of clamping down on the burst of uplink burst light signal, surge effect when can effectively suppress EDFA to amplify for burst luminous signal, solves because EDFA surge effect causes the problem of system performance degradation.
In a particular embodiment, mixed light signal after the amplification that erbium-doped fiber amplifier exports can be transferred to the receiver of optical line terminal again after isolation processing, reflected signal in described mixed light signal can be isolated by wherein said isolation processing, thus avoids the reception of described reflected signal to the uplink burst light signal of receiver to impact.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. an optical amplification device, is characterized in that, comprising:
Mixed light signal synthesizer, for receiving burst luminous signal and continuous light signal, and by described burst luminous signal and continuous light signal syntheses mixed light signal, the power of described continuous light signal is greater than the power of described burst luminous signal;
Erbium-doped fiber amplifier, amplifies for the mixed light signal exported described mixed light signal synthesizer;
Wherein, continuous light signal in described mixed light signal, for consuming the partial inversion particle of described erbium-doped fiber amplifier, makes the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the burst luminous signal in described mixed light signal maintain poised state.
2. optical amplification device according to claim 1, is characterized in that, described burst luminous signal and continuous light signal have different wave length, and described mixed light signal synthesizer comprises:
Wavelength division multiplex device, synthesizes described mixed light signal for the mode by carrying out wavelength division multiplexing to the burst luminous signal received and continuous light signal.
3. optical amplification device according to claim 1, is characterized in that, described mixed light signal synthesizer comprises optical routing device and partially reflecting mirror;
Described optical routing device, for exporting described continuous light signal to described partially reflecting mirror, receive the reflected signal that described continuous light signal returns in described partially reflecting mirror generating portion reflection, the reflected signal of described continuous light signal is provided to the output channel of described burst luminous signal, and utilizes the output channel of described burst luminous signal the reflected signal of described continuous light signal and burst luminous signal are synthesized described mixed light signal and exports described erbium-doped fiber amplifier to;
Described partially reflecting mirror, for being reflected back described optical routing device by the part in the continuous light signal of described optical routing device output.
4. optical amplification device according to claim 3, is characterized in that, described optical routing device is Wavelength division multiplexer/demultiplexer or circulator.
5. an optical line terminal, is characterized in that, comprising:
Transmitter, for launching descending continuous light signal;
Optical amplification device, for descending continuous light signal that described transmitter is launched and the uplink burst light signal synthesis mixed light signal from Optical Distribution Network, and by erbium-doped fiber amplifier, described mixed light signal is amplified, wherein, the power of described continuous light signal is greater than the power of described burst luminous signal, continuous light signal in described mixed light signal is for consuming the partial inversion particle of described erbium-doped fiber amplifier, the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the uplink burst light signal in described mixed light signal is made to maintain poised state,
Receiver, for receiving the uplink burst light signal in the mixed light signal that amplifies through described erbium-doped fiber amplifier.
6. optical line terminal as claimed in claim 5, it is characterized in that, described uplink burst light signal and described descending continuous light signal have different wave length, and described optical amplification device comprises wavelength division multiplex device, mode for carrying out wavelength division multiplexing by described uplink burst light signal and described descending continuous light signal synthesizes described mixed light signal, and exports described mixed light signal to described erbium-doped fiber amplifier.
7. optical line terminal as claimed in claim 6, is characterized in that, also comprise:
Wave decomposing multiplexer part, the uplink burst light signal through amplifying and descending continuous light signal is obtained for being carried out by the mixed light amplified through described erbium-doped fiber amplifier signal Wave Decomposition multiplexing, and export described uplink burst light signal to described receiver, export described descending continuous light signal to described Optical Distribution Network.
8. optical line terminal as claimed in claim 6, is characterized in that, also comprise:
Optical isolator, be connected between described erbium-doped fiber amplifier and described Wave decomposing multiplexer part, the reflected signal formed in described Wave decomposing multiplexer part generation reflection for intercepting the described mixed light signal through amplifying reenters described erbium-doped fiber amplifier.
9. optical line terminal as claimed in claim 5, it is characterized in that, described optical amplification device comprises optical routing device and partially reflecting mirror;
Described optical routing device is for receiving described uplink burst light signal and described descending continuous light signal, described descending continuous light signal is exported to Optical Distribution Network by described partially reflecting mirror, receive the reflected signal that described descending continuous light signal returns in the reflection of described partially reflecting mirror generating portion, and by the output channel of described burst luminous signal the reflected signal of described descending continuous light signal and described uplink burst light signal synthesized described mixed light signal and export described erbium-doped fiber amplifier to;
Described partially reflecting mirror, for being reflected back described optical routing device by the part in the descending continuous light signal of described optical routing device output.
10. optical line terminal as claimed in claim 9, it is characterized in that, described optical routing device is Wavelength division multiplexer/demultiplexer or circulator.
11. optical line terminals as claimed in claim 9, is characterized in that, also comprise:
Optical isolator, is connected between described receiver and described erbium-doped fiber amplifier, enters described receiver for the reflected signal intercepting the descending continuous light signal in the mixed light signal amplified that described erbium-doped fiber amplifier exports.
12. optical line terminals as claimed in claim 11, is characterized in that, also comprise:
Continuous light amplifier, is connected between described transmitter and described optical amplification device, and the descending continuous light signal for being launched by transmitter reoffers to described optical amplification device after carrying out amplification process.
13. 1 kinds of passive optical networks, it is characterized in that, comprise optical line terminal and multiple optical network unit, described optical line terminal is connected to described multiple optical network unit by Optical Distribution Network, the descending continuous light Signal transmissions that described optical line terminal is used for described optical line terminal to export is to described multiple optical network unit, and the uplink burst optical signal transmission exported by described multiple optical network unit is to described optical line terminal, wherein said optical line terminal is the optical line terminal such as according to any one of claim 5 to 12.
14. 1 kinds of method of light amplification, is characterized in that, described method comprises:
Receive burst luminous signal and continuous light signal, and by described burst luminous signal and continuous light signal syntheses mixed light signal, the power of described continuous light signal is greater than the power of described burst luminous signal;
Erbium-doped fiber amplifier is utilized to amplify described mixed light signal, continuous light signal in wherein said mixed light signal, for consuming the partial inversion particle of described erbium-doped fiber amplifier, makes the reversion particle of described erbium-doped fiber amplifier described erbium-doped fiber amplifier when amplifying the burst luminous signal in described mixed light signal maintain poised state.
15. methods according to claim 14, it is characterized in that, described burst luminous signal is that optical network unit exports and the uplink burst light signal transmitted through Optical Distribution Network, and described continuous light signal is the descending continuous light signal that the transmitter of optical line terminal exports.
16. methods according to claim 15, is characterized in that, described burst luminous signal and continuous light signal syntheses mixed light signal are comprised:
Adopt the mode of wavelength division multiplexing by mixed light signal described in the burst luminous signal that receives and continuous light signal syntheses, wherein said burst luminous signal and described continuous light signal have different wave length.
17. methods according to claim 16, is characterized in that, also comprise:
The mixed light signal amplified through described erbium-doped fiber amplifier is carried out Wave Decomposition multiplexing, obtain the uplink burst light signal through amplifying and descending continuous light signal, and export described uplink burst light signal to described receiver, export described descending continuous light signal to Optical Distribution Network.
18. methods according to claim 15, is characterized in that, described burst luminous signal and continuous light signal syntheses mixed light signal are comprised:
Receive described uplink burst light signal from described Optical Distribution Network, and receive described descending continuous light signal from the transmitter of described optical line terminal;
Export described descending continuous light signal to described Optical Distribution Network by partially reflecting mirror, and receive the reflected signal that described descending continuous light signal returns in the reflection of described partially reflecting mirror generating portion;
By the output channel of described burst luminous signal, the reflected signal of described descending continuous light signal and described uplink burst light signal are synthesized described mixed light signal and export described erbium-doped fiber amplifier to.
19. methods according to claim 18, is characterized in that, also comprise:
The uplink burst light signal in the mixed light signal amplified exported by described erbium-doped fiber amplifier exports the receiver of described optical line terminal to, and carries out isolation processing to intercept it by described receiver at the reflected signal of the descending continuous light signal in the mixed light signal amplified exported described erbium-doped fiber amplifier.
20., according to method described in claim 19, is characterized in that, the descending continuous light signal that the transmitter of described optical line terminal is launched processed through amplifying before being synthesized described mixed light signal.
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| PCT/CN2011/079029 WO2012119421A1 (en) | 2011-08-29 | 2011-08-29 | Optical amplifying device and method, and passive optical network system and apparatus |
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| CN102893544B true CN102893544B (en) | 2015-09-30 |
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| US9608758B1 (en) * | 2015-11-30 | 2017-03-28 | Google Inc. | Low cost gain clamped EDFA for TWDM passive optical network application |
| CN109547107B (en) * | 2017-09-21 | 2023-08-04 | 中兴通讯股份有限公司 | Method, device and equipment for controlling downlink optical signals in passive optical network |
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| CN101895345A (en) * | 2009-05-22 | 2010-11-24 | 华为技术有限公司 | Burst luminous signal amplification method, burst luminous amplifer, system and communication system |
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| CN101369085A (en) * | 2007-08-16 | 2009-02-18 | 聊城大学 | Multiport input/output single-fiber bidirectional erbium-doped fiber amplifier |
| CN101572832A (en) * | 2008-04-28 | 2009-11-04 | 华为技术有限公司 | Method, equipment and system for passive optical network extension |
| CN101383662A (en) * | 2008-10-30 | 2009-03-11 | 北京邮电大学 | Completely optical burst amplifier in optical network based on SOA intersecting gain modulation effect |
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