CN101635597A - Method for lowering noise of optical amplifier, optical access equipment and optical network system - Google Patents
Method for lowering noise of optical amplifier, optical access equipment and optical network system Download PDFInfo
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- CN101635597A CN101635597A CN200810116986A CN200810116986A CN101635597A CN 101635597 A CN101635597 A CN 101635597A CN 200810116986 A CN200810116986 A CN 200810116986A CN 200810116986 A CN200810116986 A CN 200810116986A CN 101635597 A CN101635597 A CN 101635597A
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Abstract
The invention discloses a method for lowering noise of an optical amplifier, optical access equipment and an optical network system. The method for lowering the noise of the optical amplifier comprises the following steps that: a controller in an optical relay determines wavelength shift information on uplink optical signal sent by ONU; according to the wavelength shift information, the control signal is generated; according to the control signal, an adjustable narrow band filter in the optical relay adjusts the central wavelength to be consistent with the wavelength of the uplink optical signal sent by the ONU; and the amplified uplink optical signal sent by the ONU is filtered, and the filtered optical signal is sent to OLT. The optical access equipment comprises the optical relay and an optical circuit terminal. The method can reduce the influence of the OA noise on the OLT receiver under a condition of not affecting the amplifying performance of OA on the uplink optical signal.
Description
Technical field
The present invention relates to the passive optical network technique field, especially a kind of method, optical access device and optical network system that reduces noise of optical amplifier, this optical access device relates to optical repeater and optical line terminal.
Background technology
EPON (Passive Optical Network, PON) comprise optical line terminal (Optical LineTerminal, OLT), optical network unit (Optical Network Unit, ONU) and with ONU insert OLT Optical Distribution Network (Optical Distribution Network, ODN).Wherein, (Optical Network Terminal, ONT), ONU makes a general reference ONT and ONU among the present invention to be called Optical Network Terminal when ONU has port function.ODN comprises the passive optical splitter (Splitter) that is used for the luminous power distribution, and (Optical Trunk Line OTL) connects by the light basic routing line for passive optical splitter and OLT.In order to make a PON can insert more user, cover wider scope, just need to prolong the distance between OLT and the passive optical splitter, increase the branching ratio of ODN, these all can increase the decay of light signal in the network.Therefore, need in ODN, increase the decay that optical repeater (Extender) comes compensating signal, make the receiver of OLT and ONT can operate as normal.The relaying of signal can pass through image intensifer, and (Optical Amplifier OA) realizes.Because ONT sends to the upstream data of OLT and happens suddenly, do not have upward signal during, OA can produce amplified spontaneous emission (the AmplifiedSpontaneous Emission in broadband, ASE) noise, the bandwidth of this ASE noise is very wide, can not use narrow band filter to come the noise in filtering broadband at the OLT receiving terminal.Therefore, high-power ASE noise can make degraded signal quality, reduce the signal to noise ratio of signal, causes the receiving sensitivity of OLT receiver to descend.
The existing ASE of elimination noise is to adopt a laser diode (Laser Diode that does not have modulation of output continuously to the method for the influence of OLT receiver, LD), the light signal that this LD sends is opposite with the transmission direction of ONT uplink optical signal, do not having in the time of uplink optical signal, LD will consume the last energy level particle of OA, thereby reduce forward ASE noise, reduce of the influence of ASE noise the OLT receiver.
The inventor finds prior art in realizing process of the present invention there are the following problems at least: LD is output continuously, no matter this means whether uplink optical signal is arranged, LD can export continuous light.When not having uplink optical signal, this continuous light can reduce the ASE noise of forward.But this continuous light also can reduce the gain of uplink optical signal when uplink optical signal is arranged, thereby has weakened the amplification of OA.
Summary of the invention
The embodiment of the invention provides a kind of method, optical repeater, optical line terminal and optical network system that reduces noise of optical amplifier, is implemented on the basis that does not influence the OA amplification performance, weakens the influence of ASE noise to the OLT receiver.
For this reason, the embodiment of the invention provides a kind of method that reduces noise of optical amplifier, comprising:
Controller in the optical repeater is determined the wavelength shift information of the uplink optical signal that ONU sends; Generate control signal according to wavelength shift information;
Adjustable narrow-band filter in the optical repeater is according to described control signal, self centre wavelength is adjusted into the consistent wavelength of the uplink optical signal that sends with this ONU; The uplink optical signal that this ONU after amplifying is sent carries out filtering, and will give OLT by filtered optical signal transmission.
The embodiment of the invention also provides a kind of optical repeater, comprising:
Up image intensifer is used to amplify the uplink optical signal that ONU sends;
Controller, the wavelength shift information of the uplink optical signal that is used for determining that ONU sends; Generate control signal according to wavelength shift information;
The adjustable narrow-band filter is used for according to described control signal, self centre wavelength is adjusted into the consistent wavelength of the uplink optical signal that sends with this ONU; The uplink optical signal that this ONU after amplifying is sent carries out filtering, and will give OLT by filtered optical signal transmission.
The embodiment of the invention also provides a kind of optical line terminal, comprising:
Logging modle is used to obtain the wavelength of the uplink optical signal that ONU sends;
Adjusting module is used for the wavelength of described uplink optical signal is sent to controller, controller is generated be used to the control signal of the centre wavelength of adjusting the adjustable narrow-band filter.
The embodiment of the invention also provides a kind of optical network system, comprises the ONU that is used to send uplink optical signal, above-mentioned arbitrary optical repeater and arbitrary OLT.
As shown from the above technical solution, the embodiment of the invention is adjusted the centre wavelength of adjustable narrow-band filter according to the wavelength of the uplink optical signal of ONU transmission, make adjustable narrow-band filter output uplink optical signal and the noise of filtering uplink optical signal its commplementary wave length outward, therefore can under the situation that does not influence the uplink optical signal gain, reduce the OA noise, reduce of the influence of OA noise the OLT receiver.
Description of drawings
Fig. 1 reduces the schematic flow sheet of the method embodiment one of OA noise for the present invention;
Fig. 2 reduces the schematic flow sheet of the method embodiment two of OA noise for the present invention;
Fig. 3 is the structural representation of optical repeater embodiment one of the present invention;
Fig. 4 is the structural representation of optical repeater embodiment two of the present invention;
Fig. 5 is the structural representation of optical repeater embodiment three of the present invention;
Fig. 6 is the structural representation of optical repeater embodiment four of the present invention;
Fig. 7 is the structural representation of optical repeater embodiment five of the present invention;
Fig. 8 is the structural representation of optical repeater embodiment six of the present invention;
Fig. 9 is the structural representation of optical repeater embodiment seven of the present invention;
Figure 10 is the structural representation of OLT embodiment one of the present invention;
Figure 11 is the structural representation of OLT embodiment two of the present invention;
Figure 12 is the structural representation of optical network system embodiment of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
As shown in Figure 1, the embodiment of the invention comprises:
Step 11: the controller in the optical repeater is determined the wavelength shift information of the uplink optical signal that ONU sends; Generate control signal according to wavelength shift information.
Wherein, wavelength shift information can be determined by the power meter measuring device in the optical repeater, perhaps obtain from OLT.
Concrete, the power meter measuring device can be set in optical repeater, this power meter measuring device is used to measure the Output optical power (Output optical power reverse with uplink optical signal) of the monitoring arm of adjustable narrow-band filter.When the wavelength of the centre wavelength of adjustable narrow-band filter and uplink optical signal is identical, uplink optical signal can pass through this adjustable narrow-band filter smoothly, because power and uplink optical signal that this power meter measuring device is measured are reverse, therefore when the wavelength of the centre wavelength of adjustable narrow-band filter and uplink optical signal is identical, the power minimum of this power meter measuring device measurement; Behind wave length shift, the luminous power that this power meter measuring device measures will increase, this moment can be by the controller that has obtained the luminous power that the power meter measuring device records, directly adjust the centre wavelength of tunable filter, the luminous power that this power meter measuring device is measured reaches default minimum value, make that promptly the centre wavelength of adjustable narrow-band filter is identical with the wavelength of uplink optical signal, guarantee that the light signal of centre wavelength passes through the noise of other wavelength of filtering.
Perhaps, if the temperature of ONU changes, because the uplink optical signal wavelength change that variations in temperature can cause this ONU to send, exemplary value is 0.08nm/ ℃, the drift of wavelength can make the light signal that should see through tunable filter output be prevented from, and causes the uplink optical signal decay to increase.OLT can be after the power that detects uplink optical signal dies down above a preset threshold value, and the temperature information that regularly reports according to ONU calculates the new wavelength of uplink optical signal this moment; Be specifically as follows according to temperature information and obtain temperature change value, obtain the wavelength change value according to temperature change value and above-mentioned representative value (0.08nm/ ℃) again, and then obtain new wavelength (temperature raises, and wavelength increases).Controller in the optical repeater can obtain this new wavelength or obtain the wavelength change value from OLT.
Step 12: the adjustable narrow-band filter in the optical repeater is according to described control signal, and self centre wavelength is adjusted into consistent wavelength with this uplink optical signal; This uplink optical signal after amplifying is carried out filtering, and will be transferred to OLT by filtered uplink optical signal.The centre wavelength of promptly adjusting the adjustable narrow-band filter is identical with the wavelength of uplink optical signal, guarantees that the light signal of centre wavelength passes through, the noise of other wavelength of filtering, the filtering OA noise of trying one's best under the situation of the gain of the uplink optical signal after guaranteeing to amplify.
Present embodiment is by adjusting the centre wavelength of adjustable narrow-band filter, make the wavelength of the uplink optical signal that centre wavelength and ONU send identical, make the light signal of adjustable narrow-band filter output center wavelength, and the noise of its commplementary wave length of filtering, therefore can under the situation that does not influence the OA performance, eliminate of the influence of the ASE noise of OA output to the OLT receiver performance.
Fig. 2 reduces the schematic flow sheet of the method embodiment two of OA noise for the present invention, and this embodiment comprises:
Step 21:OLT writes down the wavelength of the uplink optical signal that ONU sends in the ONU registration process, the wavelength of described uplink optical signal is recorded in this locality or be handed down to embedded Optical Network Terminal in the optical repeater (Embedded ONT, EONT).
Be specifically as follows: when ONU registers to OLT, dynamically adjust the centre wavelength of adjustable narrow-band filter in up passband, ONU is registered receive the uplink optical signal of ONU as OLT after, registration finishes the wavelength of back record ONU uplink optical signal.
More specifically, at registration phase, at first the centre wavelength with the adjustable narrow-band filter is adjusted to some numerical value, if OLT does not receive the message of the request registration of ONU within a certain period of time, then thinks the light signal that do not have ONU to upload this moment near this centre wavelength; Change the centre wavelength of (is 1nm as selecting step-length) adjustable narrow-band filter gradually by controller, this centre wavelength is changed in whole up passband, if receive the uplink optical signal of ONU sometime, then begin normal register flow path, registration finishes the centre wavelength of back this ONU uplink optical signal of record.
If OLT directly adjusts the adjustable narrow-band filter by controller, then OLT is kept at this locality with the wavelength of the ONU uplink optical signal of record; If the EONT in the optical repeater adjusts the adjustable narrow-band filter by controller, then OLT is handed down to EONT with the wavelength of the ONU uplink optical signal of record, OLT can manage control interface by ONT, and (ONT Management and Control Interface, OMCI) passage issues this wavelength information.
Step 22:OLT distributes ascending time slot for each ONU, and is notified to each ONU, and optical repeater obtains the last line time of each ONU according to the ascending time slot of this distribution.
Be specifically as follows: if OLT directly adjusts the adjustable narrow-band filter by controller, distribute, so OLT itself knows that each ONU goes up line time because ascending time slot is OLT; If the EONT in the optical repeater adjusts the adjustable narrow-band filter by controller, then EONT can obtain the last line time of each ONU by resolving assignment messages that OLT is handed down to ONU, as OLT distribution result is passed through bandwidth map (BandWidth map, BWmap) information broadcast is given each ONU, and then EONT can resolve the last line time that this BWmap message is learnt each ONU.
Step 23: controller generates initial control signal according to the wavelength and the last line time of the uplink optical signal that ONU sends, and the adjustable narrow-band filter is identical with the wavelength that self centre wavelength is adjusted into the uplink optical signal that ONU sends according to this initial control signal.
Be specifically as follows: controller according to last line time before the uplink optical signal that ONU sends arrives optical repeater, the wavelength information that OLT is issued is notified to the adjustable narrow-band filter, adjustable narrow-band is adjusted into self centre wavelength the wavelength of the uplink optical signal that this ONU sends, guarantee this uplink optical signal can high-quality, harmless lost territory is by optical repeater, and the outer noise of filtering centre wavelength as far as possible.
Perhaps, if comprise the power meter measuring device in the optical repeater, can also directly adjust the centre wavelength of adjustable narrow-band filter, the luminous power that the power meter measuring device is measured reaches default minimum value.
Above-mentioned flow process is by when ONU registers, and OLT writes down the wavelength of the uplink optical signal of this ONU transmission, has realized the initialization of adjustable narrow-band filter, and promptly the initial center wavelength is the wavelength of the uplink optical signal of record.After skew appearred in the wavelength of this uplink optical signal, present embodiment can also comprise:
Step 24: controller is adjusted the centre wavelength of self according to the new wavelength control adjustable narrow-band filter that obtains from OLT, perhaps adjust the centre wavelength of self according to the measuring light power control adjustable narrow-band filter that obtains from the power meter measuring device, the luminous power that the power meter measuring device is measured reaches default minimum value.Guarantee that the uplink optical signal decay is minimum.
Be specifically as follows: if OLT directly adjusts the adjustable narrow-band filter by controller, then OLT can send to controller by directly that this is new wavelength, makes controller adjust the centre wavelength of adjustable narrow-band filter according to this new wavelength; If the EONT in the optical repeater adjusts the adjustable narrow-band filter by controller, then OLT is handed down to EONT with this new wavelength, makes EONT adjust the adjustable narrow-band filter by controller.Present embodiment can leach the OA noise under the prerequisite of the uplink optical signal that the unattenuated ONU that tries one's best sends, reduce the influence of OA noise to the OLT receiver performance.And, present embodiment has also been considered the situation of ONU variations in temperature, can be according to the centre wavelength of new wavelength that calculates or the adjustment self of wavelength shift amount control adjustable narrow-band filter, the perhaps centre wavelength of the optical power adjustment of measuring according to the power meter measuring device self, the luminous power that the power meter measuring device is measured reaches default minimum value, makes range of application more extensive.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 3 is the structural representation of optical repeater embodiment one of the present invention, and this embodiment comprises upgoing O A31, adjustable narrow-band filter 32 and controller 33.Upgoing O A31 is used to amplify the uplink optical signal that ONU sends; Controller 33 is used for the wavelength shift information of the uplink optical signal of definite ONU transmission; Generate control signal according to wavelength shift information; Adjustable narrow-band filter 32 is used for according to described control signal, self centre wavelength is adjusted into the consistent wavelength of the uplink optical signal that sends with this ONU; The uplink optical signal that this ONU after amplifying is sent carries out filtering, and will give OLT by filtered optical signal transmission.
The wavelength of the uplink optical signal that present embodiment sends according to ONU is adjusted the centre wavelength of adjustable narrow-band filter, makes the adjustable narrow-band filter can be under the prerequisite of unattenuated uplink optical signal of trying one's best, and filtering OA noise reduces the influence of OA noise to the OLT receptivity.
Fig. 4 is the structural representation of optical repeater embodiment two of the present invention, different with embodiment one is, this embodiment also comprise two wavelength division multiplexers (Wavelength Division Multiplex, WDM) 41, descending OA42, built in light network terminal EONT43 and optical splitter 44.Wherein, WDM41 is used for separating the up-downgoing light signal that transmits between ONU and the OLT, and uplink optical signal is amplified by upgoing O A31, and downlink optical signal is amplified by descending OA42; The up-downgoing light signal closes ripple by a WDM, realizes the transmission of single fiber bi-directional.Adjustable narrow-band filter 32 is used for the uplink optical signal after amplifying is carried out Filtering Processing, uplink optical signal is passed through, the noise that the filtering uplink optical signal is outer.OLT distributes ascending time slot for each ONU, and writes down the wavelength of the uplink optical signal of each ONU transmission when ONU registers, and it is that the last line time that ONU distributes sends to EONT43 that optical splitter 44 is used for the wavelength of the uplink optical signal of OLT record and OLT.EONT43 is used for the wavelength of the uplink optical signal that will obtain and goes up line time sending to controller 33, and controller 33 is used for according to the wavelength of the uplink optical signal that obtains and goes up the centre wavelength that line time is adjusted adjustable narrow-band filter 32.。Wherein, if after the ONU variations in temperature, the temperature information that OLT reports according to ONU calculates the wavelength shift amount of the uplink optical signal that this ONU sends or new wavelength, and be handed down to EONT43, EONT43 sends to controller 33 with wavelength shift amount or new wavelength, controller 33 generates control signal according to this wavelength shift amount or new wavelength, and control adjustable narrow-band filter 32 is adjusted the centre wavelength of self according to this new wavelength.In the said equipment, between controller and the adjustable narrow-band filter, can be connected by electric wire (wire) between EONT and the controller, can pass through optical fiber (fiber) between all the other equipment and connect.
OLT sends to EONT with the wavelength of the ONU uplink optical signal of record in the present embodiment, is adjusted the centre wavelength of tunable filter by the EONT indicating controller.
Fig. 5 is the structural representation of optical repeater embodiment three of the present invention, different with embodiment two is, tunable filter in the present embodiment specifically comprises Mach-Zehnder interferometer (Mach-Zehnderinterferometer, MZI) 521 and Coarse Wave Division Multiplexer (Coarse Wavelength DivisionMultiplex, CWDM) 522, present embodiment also comprises power meter measuring device (Power Meter) 51.In the said equipment, between controller and the MZI, between EONT and the controller, can be connected by lead (wire) between power meter measuring device and the controller, can pass through optical fiber (fiber) between all the other equipment and connect.
Wherein, CWDM522 is as thick band pass filter, its passband width can guarantee ONU certain temperature range (as, the ambient temperature of ONU is at-40～+ 85 ℃) in during variation, the uplink optical signal that ONU uploads all can pass through, as electing the bandwidth of CWDM522 as 13nm.MZI521 is as the faciola bandpass filter, guarantees that the ONU uplink optical signal of uploading passes through, and the noise of its commplementary wave length of filtering, thereby the noise further in the filtering CWDM522 bandwidth obtain the uplink optical signal of a high s/n ratio.
Because the passband of MZI521 is periodic, after a passband occurs, through behind certain wavelength interval another passband can appear, and the wavelength interval between two passbands is a Free Spectral Range.If only use MZI521, then the ASE noise of OA generation can pass through MZI521 by other passband, increased the noise in the signal, therefore, need adopt CWDM522 and MZI521 simultaneously, and need to guarantee the Free Spectral Range of the bandwidth of CWDM522 less than MZI521, the periodicity passband that MZI521 is produced becomes unique passband, is realized having the narrow band filter of unique passband by CWDM522 and MZI521.
Simultaneously, MZI521 is again an adjustable filter, and the phase difference of two arms that controller 33 can be by changing MZI521 changes the centre wavelength of the passband of MZI521, realizes adjustable filtering.No. 1 arm among the figure is an output arm, the uplink optical signal of output behind the narrow-band filtering, and No. 2 arms among the figure are the monitoring arm, the output of its output and output arm reverse, promptly the passband of output arm is the forbidden band of monitoring arm, the forbidden band of output arm is the passband of monitoring arm.Because the power of light signal is therefore when uplink optical signal is in the free transmission range of output arm, little from the power of monitoring arm output greater than the ASE noise power of co-wavelength, when uplink optical signal was in the forbidden band scope of output arm, the power of exporting from the monitoring arm was big.
Power meter measuring device (Power Meter) 51 is connected with the monitoring arm of MZI521, is used for measuring when ONU registers the Output optical power of MZI monitoring arm.OLT can register ONU according to this Output optical power, the wavelength of record ONU uplink optical signal.Be specifically as follows: when ONU registered, at first the centre wavelength with MZI521 was adjusted in some numerical value.Because the power of light signal is greater than the ASE noise power of co-wavelength, if OLT does not receive the message of the request registration of ONU in the certain hour, and the luminous power that power meter measuring device 51 is measured is lower, then thinks the light signal that do not have ONU to upload this moment; If OLT does not receive the message of the request registration of ONU in the certain hour, but the luminous power that power meter measuring device 51 is measured is higher, think that then light signal that ONU uploads is in other passband, controller need change the centre wavelength of MZI521, receive the request registration message that ONU uploads up to OLT, carry out normal register flow path afterwards, registration finishes the wavelength that back OLT writes down this ONU uplink optical signal.
OLT sends to EONT43 with the wavelength of the ONU uplink optical signal of record and the last line time that distributes for each ONU, EONT43 sends to controller 33 with the wavelength and the last line time of this uplink optical signal, controller 33 sent to MZI521 with the wavelength of this uplink optical signal according to last line time before each ONU uplink optical signal arrives light optical repeater, MZI521 is adjusted into self centre wavelength the wavelength of this ONU uplink optical signal.Simultaneously, when the ONU variations in temperature, will cause and should export from the monitoring arm from the light signal of output arm output, the luminous power that power meter measuring device 51 is measured increases.In order to obtain the uplink optical signal of better quality, need readjust the centre wavelength of MZI521.Specifically can calculate wavelength shift amount or new wavelength according to the temperature information that ONU reports by following dual mode: OLT, OLT sends to MZI521 with this wavelength shift amount or new wavelength by controller 33, and MZI521 is adjusted into the centre wavelength of self identical with this new wavelength.Perhaps, controller 33 is knowing that the luminous power that power meter measuring device 51 is measured increases above after certain threshold value, directly generate control signal, MZI521 readjusts self centre wavelength according to control signal, is adjusted to the luminous power that power meter measuring device 51 is measured and reaches default minimum value.
Present embodiment is opened the up-downgoing light signal by the centre wavelength of EONT indicating controller adjustment tunable filter by the WDM branch, realizes the adjustable narrow-band filter by CWDM and MZI.
Fig. 6 is the structural representation of optical repeater embodiment four of the present invention, and different with embodiment three is that with two WDM in two CWDM61 alternative embodiments three, the adjustable narrow-band filter in the present embodiment comprises MZI621 among this embodiment.Wherein, MZI621 is identical with the MZI of embodiment three, is the adjustable periodically faciola bandpass filter of passband that has.CWDM61 is used for separate/converging the uplink and downlink signals that transmits between ONU and the OLT, and can make the ONU uplink optical signal when predetermined temperature range changes all by and bandwidth less than the Free Spectral Range of MZI621.
Present embodiment is opened the up-downgoing light signal by the centre wavelength of EONT indicating controller adjustment tunable filter by the CWDM branch, realizes the adjustable narrow-band filter by CWDM and MZI.
Fig. 7 is the structural representation of optical repeater embodiment five of the present invention, and different with embodiment two is that present embodiment is directly controlled by OLT, does not comprise EONT and optical splitter.As, if optical repeater is when OLT is very near, need not the agency of EONT, the ascending time slot that can distribute according to the wavelength of the ONU uplink optical signal of record and for each ONU by OLT, the directly centre wavelength by controller 33 adjustment adjustable narrow-band filters 32 as OLT.All the other operation principles are identical with embodiment two.
Present embodiment is adjusted the centre wavelength of tunable filter by the direct indicating controller of OLT.
Fig. 8 is the structural representation of optical repeater embodiment six of the present invention, and different with embodiment three is that present embodiment is directly controlled by OLT, does not comprise EONT and optical splitter.As, if optical repeater is when OLT is very near, need not the agency of EONT, the ascending time slot that can distribute according to the wavelength of the ONU uplink optical signal of record and for each ONU by OLT, the directly centre wavelength by controller 33 adjustment adjustable narrow-band filters 32 as OLT.All the other operation principles are identical with embodiment three.
Present embodiment is opened the up-downgoing light signal by the centre wavelength of the direct indicating controller adjustment of OLT tunable filter by the WDM branch, realizes the adjustable narrow-band filter by CWDM and MZI.
Fig. 9 is the structural representation of optical repeater embodiment seven of the present invention, and different with embodiment four is that present embodiment is directly controlled by OLT, does not comprise EONT and optical splitter.As, if optical repeater is when OLT is very near, need not the agency of EONT, the ascending time slot that can distribute according to the wavelength of the ONU uplink optical signal of record and for each ONU by OLT, the directly centre wavelength by controller 33 adjustment adjustable narrow-band filters 32 as OLT.All the other operation principles are identical with embodiment four.
Present embodiment is opened the up-downgoing light signal by the centre wavelength of the direct indicating controller adjustment of OLT tunable filter by the CWDM branch, realizes the adjustable narrow-band filter by CWDM and MZI.
Figure 10 is the structural representation of OLT embodiment one of the present invention, and this embodiment comprises logging modle 101 and adjusting module 102.Logging modle 101 is used to obtain the wavelength of the uplink optical signal that ONU sends; Adjusting module 102 is used for the wavelength of described uplink optical signal is sent to controller, controller is generated be used to the control signal of the centre wavelength of adjusting the adjustable narrow-band filter.
Wherein, adjusting module 102 can directly send to controller with the wavelength shift amount of this uplink optical signal of obtaining after the wavelength of the uplink optical signal that writes down in the ONU registration process and the variations in temperature or new wavelength, makes controller adjust the centre wavelength of self according to the wavelength control adjustable narrow-band filter of uplink optical signal.
Perhaps, adjusting module 102 can be handed down to EONT with the wavelength of described uplink optical signal, is transmitted the wavelength of this uplink optical signal by EONT and gives controller, makes controller adjust the centre wavelength of self according to the wavelength control adjustable narrow-band filter of this uplink optical signal.
Present embodiment is adjusted the centre wavelength of adjustable narrow-band filter according to the wavelength of ONU uplink optical signal, make the adjustable narrow-band filter can be under the prerequisite of the uplink optical signal that the unattenuated ONU of trying one's best sends, filtering OA noise reduces the influence of OA noise to the OLT receiver performance.
Figure 11 is the structural representation of OLT embodiment two of the present invention, different with embodiment one is, this embodiment 122 also comprises distribution module 111, be used to line time in the ONU distribution, the wavelength that makes the uplink optical signal that controller sends according to ONU and last line time control adjustable narrow-band filter are adjusted into self centre wavelength identical with the wavelength of uplink optical signal, finish the initialization of adjustable narrow-band filter.
Perhaps, present embodiment can also comprise thermal module 112, be used for temperature information according to ONU and obtain the wavelength shift amount of the uplink optical signal that ONU sends or new wavelength, it is identical with this new wavelength that controller is adjusted into self centre wavelength according to described wavelength shift amount or new wavelength control adjustable narrow-band filter, satisfies the situation after the uplink optical signal wavelength shift.
Wherein, the last line time of module assigns, the wavelength shift amount that thermal module obtains or new wavelength can send to controller by adjusting module, perhaps, directly these information are sent to controller (situation shown in Figure 11).
Present embodiment can accurately select to adjust the moment of centre wavelength according to last line time, and can adjust centre wavelength according to new wavelength after variations in temperature, makes range of application more extensive.
Figure 12 is the structural representation of optical network system embodiment of the present invention, and this embodiment comprises optical repeater 121, OLT122 and OUN123.Wherein, optical repeater 121 is the optical repeater embodiment of Fig. 3-Fig. 9 shown in arbitrary, and OLT122 is Figure 10 or OLT embodiment shown in Figure 11, and ONU123 is used to send uplink optical signal.
Can be under the prerequisite of the uplink optical signal that the unattenuated ONU that tries one's best sends by present embodiment, filtering OA noise reduces the influence of OA noise to the OLT receptivity.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (14)
1, a kind of method that reduces noise of optical amplifier is characterized in that, comprising:
Controller in the optical repeater is determined the wavelength shift information of the uplink optical signal that ONU sends; Generate control signal according to wavelength shift information;
Adjustable narrow-band filter in the optical repeater is according to described control signal, self centre wavelength is adjusted into the consistent wavelength of the uplink optical signal that sends with this ONU; The uplink optical signal that this ONU after amplifying is sent carries out filtering, and will give OLT by filtered optical signal transmission.
2, method according to claim 1 is characterized in that, also comprises:
Controller in the optical repeater obtains the wavelength that OLT is the described uplink optical signal of the last line time that distributes of described uplink optical signal and OLT record, according to described line time and the wavelength generation initial control signal of going up;
Adjustable narrow-band filter in the optical repeater is according to described initial control signal, is adjusted into self centre wavelength identical with the wavelength of described uplink optical signal.
3, method according to claim 1 is characterized in that, the controller in the described optical repeater is determined the wavelength shift information of the uplink optical signal that ONU sends; Generating control signal according to wavelength shift information comprises:
Power meter measuring device in the optical repeater is measured the Output optical power of described uplink optical signal at the monitoring arm of described adjustable narrow-band filter; The luminous power that controller in the optical repeater is measured according to described power meter measuring device generates control signal; Perhaps
OLT obtains the wavelength shift amount of described uplink optical signal or new wavelength according to the temperature information of ONU; Controller in the optical repeater is determined the wavelength shift information of the uplink optical signal that ONU sends according to described wavelength shift amount or new wavelength, and generates control signal according to this wavelength shift information.
4, a kind of optical repeater is characterized in that, comprising:
Up image intensifer is used to amplify the uplink optical signal that ONU sends;
Controller, the wavelength shift information of the uplink optical signal that is used for determining that ONU sends; Generate control signal according to wavelength shift information;
The adjustable narrow-band filter is used for according to described control signal, self centre wavelength is adjusted into the consistent wavelength of the uplink optical signal that sends with this ONU; The uplink optical signal that this ONU after amplifying is sent carries out filtering, and will give OLT by filtered optical signal transmission.
5, optical repeater according to claim 4 is characterized in that, also comprises:
Embedded Optical Network Terminal is used to obtain the wavelength of the uplink optical signal that optical network unit sends and goes up line time, and described wavelength and last line time are sent to described controller;
Described controller is used for generating control signal according to described wavelength and last line time.
6, optical repeater according to claim 5 is characterized in that, also comprises:
Optical splitter, the wavelength of the uplink optical signal that the optical network unit that is used for that optical line terminal is write down sends and optical line terminal are that the last line time that optical network unit distributes sends to described embedded Optical Network Terminal.
7, optical repeater according to claim 4 is characterized in that, described adjustable narrow-band filter comprises:
The Mach-Zehnder interferometer has the periodic filter function that uplink optical signal that optical network unit is sent passes through;
Coarse Wave Division Multiplexer is connected with described Mach-Zehnder interferometer, and the uplink optical signal that optical network unit is sent when predetermined temperature range changes all passes through, and bandwidth is less than the Free Spectral Range of described Mach-Zehnder interferometer.
8, optical repeater according to claim 7 is characterized in that, also comprises:
The power meter measuring device is used to measure the Output optical power that the Mach-Zehnder interferometer is monitored arm;
Described controller is used for determining according to the luminous power that described power meter measuring device is measured the wavelength shift information of the uplink optical signal that ONU sends; Generate control signal according to this wavelength shift information.
9, optical repeater according to claim 4 is characterized in that:
Described adjustable narrow-band filter comprises the Mach-Zehnder interferometer with periodic filter function that uplink optical signal that optical network unit is sent passes through;
Described optical repeater also comprises Coarse Wave Division Multiplexer, be used for separating the up-downgoing light signal that transmits between optical network unit and the optical line terminal, and the uplink optical signal that optical network unit is sent when predetermined temperature range changes all passes through, and bandwidth is less than the Free Spectral Range of Mach-Zehnder interferometer.
10, a kind of optical line terminal is characterized in that, comprising:
Logging modle is used to obtain the wavelength of the uplink optical signal that ONU sends;
Adjusting module is used for the wavelength of described uplink optical signal is sent to controller, controller is generated be used to the control signal of the centre wavelength of adjusting the adjustable narrow-band filter.
11, optical line terminal according to claim 10 is characterized in that:
Described adjusting module is used for the wavelength of described uplink optical signal is directly sent to described controller; Perhaps
Described adjusting module is used for the wavelength of described uplink optical signal is sent to controller by embedded Optical Network Terminal.
12, optical line terminal according to claim 10, it is characterized in that, also comprise: distribution module, be used to line time in the ONU distribution, the last line time of described uplink optical signal is sent to controller, make controller generate the control signal of the centre wavelength that is used to adjust the adjustable narrow-band filter according to described wavelength and last line time.
13, optical line terminal according to claim 10, it is characterized in that, also comprise: thermal module, be used for temperature information according to ONU and obtain the wavelength shift amount of the uplink optical signal that ONU sends or new wavelength, described wavelength shift amount or new wavelength are sent to controller, make controller generate the control signal of the centre wavelength that is used to adjust the adjustable narrow-band filter according to described new wavelength.
14, a kind of optical network system is characterized in that, comprising:
ONU is used to send uplink optical signal;
As the arbitrary described optical repeater of claim 4-9, and
Optical line terminal as claimed in claim 10.
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