CN101651499B - Method and system for controlling optical amplifier in relay unit of passive optical network - Google Patents
Method and system for controlling optical amplifier in relay unit of passive optical network Download PDFInfo
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- CN101651499B CN101651499B CN200810030126.8A CN200810030126A CN101651499B CN 101651499 B CN101651499 B CN 101651499B CN 200810030126 A CN200810030126 A CN 200810030126A CN 101651499 B CN101651499 B CN 101651499B
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Abstract
The invention discloses a method for controlling an optical amplifier in a relay unit of a passive optical network, which comprises the following steps of: determining a work current value of the optical amplifier according to the information from the relay unit; and sending the work current value to the relay unit and instructing the relay unit to set the work current of the optical amplifier according to the work current value. Correspondingly, the invention also discloses a system for controlling an optical amplifier in a relay unit of a passive optical network. The method and the system can control the ASE noise in the optical amplifier, thereby reducing the influence of the ASE noise on an optical line terminal.
Description
Technical field
The present invention relates to optical-fiber network technical field, relate in particular to the method and system of controlling the image intensifer in TU Trunk Unit in a kind of EPON, and a kind of method and device that obtains the amplification autoradiolysis noise power of image intensifer and the corresponding relation of operating current.
Background technology
EPON (Passive Optical Network, PON) by optical line terminal (the Optical Line Terminal of office's side, OLT), the Optical Network Terminal of user's side (Optical Network Terminal, ONT) or optical network unit (Optical Network Unit, ONU), and the composition such as Optical Distribution Network (Optical Distribution Network, ODN).
Fig. 1 is a kind of network topology structure figure of passive optical network.As shown in Figure 1, this EPON comprises OLT, ONT, and wherein OLT is down direction to the transmission direction of ONT, adopts time division multiplexing (Time-Division Multiplexing TDM) mode; The transmission of downlink data is continuous, and the mode that OLT crosses information exchange broadcast continuously sends to each ONT, and each ONT selects one's own data to receive.ONT is to the up direction that is transmitted as of OLT, adopt time division multiple access multiplexing (Time-Division Multiplexing access, TDMA) mode, upstream data sends and happens suddenly, different ONT take different ascending time slots, and a plurality of ONT share up link by time-multiplexed mode.
In order to make a PON network can access more user, cover wider scope, the distance that just need to extend OLT and ODN, the branching ratio of increase ODN, these all can increase the decay of light signal in PON network.So need to increase the decay that TU Trunk Unit is carried out compensating signal in network, the receiver of OLT and ONT can normally be worked.For example, adopt repeater (Extender) to carry out the decay of compensating signal, the relaying of light signal can be by utilizing image intensifer (the Optical Amplifier in Extender, OA) realize the integrated special embedded ONT(Embedded of ONT--ONT, an EONT in Extender), this ONT can be used for monitoring the operating state of OA, within the time period of distributing, by the reporting parameters of collecting to OLT, thereby realize the management to Extender.Fig. 2 is that the EPON shown in Fig. 1 has added the network topology structure after Extender.
Because up data happen suddenly, do not have upward signal during, OA can produce amplified spontaneous emission (Amplified Spontaneous Emission, the ASE) noise in broadband.Although the ASE noise power of each wavelength is lower, the highest only having-20dBm, because its bandwidth is very wide, the gross power of ASE noise can reach 0dBm.And, because the wave-length coverage of ONT transmitter is very large, at OLT receiving terminal, can not with narrow band filter, carry out the noise in filtering broadband, cause wideband A SE noise all to arrive the receiver of OLT, high-power ASE noise will affect the receiver of OLT.For example, in the process of ONT registration, OLT does not also know when the information of uploading of ONT can arrive, so its receiving circuit keeps operating state always, now ASE noise can be accumulated at receiver place, being accumulated to the information that to a certain degree can make afterwards ONT upload cannot be identified by OLT, causes ONT hour of log-on to extend or failure.
In prior art, by increase a continuous wave output in extender, do not have the laser diode (Laser Diode, LD) of modulation to eliminate ASE noise.As shown in Figure 3, the centre wavelength of this LD is 1330nm, transmission direction is contrary with the upward signal (optical wavelength is 1310nm) of ONT transmission, the light of 1330nm can not have in the time of uplink optical signal, consume the upper energy level particle of OA, thereby reduce the ASE noise of forward, thereby reduced the impact that OLT receiver is subject to.But this need to increase extra LD in extender, has increased cost; And there is a problem: because this LD is continuous wave output, no matter this means whether there is upward signal, LD can export continuous light.Therefore, do not have upward signal time, the continuous light of LD output can reduce the ASE noise of forward; And have upward signal time, the continuous light of LD output, when reducing ASE noise, also can reduce the gain of upward signal, thereby weaken the amplification of OA.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, method and a kind of passive optical network of in a kind of EPON, controlling the image intensifer in TU Trunk Unit are provided, the impact of the ASE noise that makes to reduce image intensifer on optical line terminal.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of control the image intensifer in TU Trunk Unit in EPON method, comprising:
According to the message that comes from described TU Trunk Unit, determine the working current value of described image intensifer, in described message, carry: the amplified spontaneous emission noise power of described image intensifer and the corresponding relation of operating current;
Described working current value is sent to described TU Trunk Unit, indicate described TU Trunk Unit according to described current value is set, the operating current of described image intensifer is set.
Correspondingly, the embodiment of the present invention also provides a kind of passive network system, comprises optical line terminal and TU Trunk Unit, wherein:
Described optical line terminal comprises processing unit, described processing unit is for determining the working current value of described TU Trunk Unit image intensifer according to the message that comes from described TU Trunk Unit, and described working current value is sent to described TU Trunk Unit, in described message, carry: the amplified spontaneous emission noise power of described image intensifer and the corresponding relation of operating current;
Described TU Trunk Unit, for according to the described working current value that comes from described optical line terminal, arranges the operating current of described image intensifer.
Correspondingly, the embodiment of the present invention also provides a kind of device that obtains the amplification autoradiolysis noise power of image intensifer and the corresponding relation of operating current, comprising:
Current regulation unit, not under the condition of input optical signal, regulates the working current value of described image intensifer for the input at described image intensifer;
Filter unit, one end connects the output of described image intensifer, for the output signal of described image intensifer is carried out to narrow-band filtering;
Measuring light power unit, one end connects the output of described filter unit, be used for according to each working current value of described image intensifer, the amplification autoradiolysis noise power-value of measuring described filter unit output, forms the amplification autoradiolysis noise power-value of described image intensifer and the corresponding relation of working current value.
The embodiment of the present invention is determined the working current value of the image intensifer in TU Trunk Unit according to the message that comes from TU Trunk Unit by optical line terminal, and indicate TU Trunk Unit that the operating current of image intensifer is set according to this working current value, make to control the generation of image intensifer ASE noise, thereby reduce the impact of ASE noise on the receiver of OLT.
Accompanying drawing explanation
Fig. 1 is the network topology structure schematic diagram of existing a kind of passive optical network;
Fig. 2 is that the passive optical network shown in Fig. 1 increases the network topology structure schematic diagram after Extender;
Fig. 3 is the schematic diagram that comprises the transmission direction of the light signal of upward signal and LD in the Extender of LD in prior art;
Fig. 4 controls the method schematic diagram of the image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention one;
Fig. 5 controls the method schematic diagram of the image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention two;
Fig. 6 is the method schematic diagram of the amplification autoradiolysis noise power of obtaining image intensifer of the embodiment of the present invention and the corresponding relation of operating current;
Fig. 7 is a kind of register method schematic diagram that comprises the EPON of TU Trunk Unit of the embodiment of the present invention;
Fig. 8 controls the system configuration schematic diagram of image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention one;
Fig. 9 controls the system configuration schematic diagram of image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention two;
Figure 10 is a kind of structural representation that obtains the device of the amplification autoradiolysis noise power of image intensifer and the corresponding relation of operating current of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The embodiment of the present invention, by EPON, is controlled the operating current of the image intensifer in TU Trunk Unit, thereby controls the ASE noise that image intensifer produces, thus the impact of the ASE noise of minimizing image intensifer on the receiver of optical line terminal.Further, the embodiment of the present invention can, according to the interactive information between TU Trunk Unit and optical line terminal, arrange the operating current of image intensifer.
Fig. 4 controls the method schematic diagram of the image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention one.The method of using the embodiment of the present invention to provide, not increasing Extender cost and not affecting on the basis of OA performance, can realize the control to the ASE noise of OA.With reference to figure 4, described method comprises:
S401, basis come from the message of TU Trunk Unit, determine the working current value of the image intensifer in described TU Trunk Unit;
S402, described working current value is sent to described TU Trunk Unit, indicate described TU Trunk Unit according to described working current value, the operating current of described image intensifer is set.
In the embodiment of the present invention, TU Trunk Unit sends message to optical line terminal, optical line terminal determines according to described message the working current value that is suitable for described image intensifer, and described working current value is sent to described TU Trunk Unit, then TU Trunk Unit arranges the operating current of its image intensifer according to this working current value.TU Trunk Unit sends in the described message of optical line terminal, carry the ASE noise power of image intensifer and the corresponding relation of operating current, can also carry the information such as uplink transmission power (upward signal of EONT transmitting is without image intensifer, therefore do not comprise ASE noise power in uplink transmission power) of the EONT in TU Trunk Unit.
Fig. 6 is the amplification autoradiolysis noise power of acquisition image intensifer of the embodiment of the present invention and the method schematic diagram of the corresponding relation of operating current.Please refer to Fig. 6,
The input no signal of S601, described image intensifer;
S602, the output end signal of described image intensifer is sent to light power meter by optics narrow band filter;
S603, regulate successively the operating current of described image intensifer, and record respectively the numerical value on its working current value and corresponding described light power meter.
The specific implementation process of said method is: the input of the OA in TU Trunk Unit is input optical signal not, and the output of OA is connected with one end of optics narrow band filter, and the bandwidth of described filter meets the requirement of network performance, as 13nm.The other end of optics narrow band filter connects light power meter.Regulate the operating current (process of adjusting is preferably in order adjusting from big to small or from small to large) of OA, because OA does not now have light signal input, so the output of OA only has ASE noise.Often be adjusted to a current value, just record the numerical value on light power meter now, finally form ASE power in OA passband and the corresponding relation of operating current.For example, during electric current 100mA, ASE noise power is+1dBm; During electric current 150mA, ASE noise power is+2.5dBm; When electric current is 200mA, ASE noise power is+3.5dBm.This corresponding relation is generally measured in advance, and the mapping table that forms ASE noise power and operating current deposits in the memory of EONT, for example, can store in flash memory or internal memory.This method of using the embodiment of the present invention to provide, can obtain the ASE noise power of image intensifer and the corresponding relation of operating current.
Fig. 5 controls the method schematic diagram of image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention two.With reference to figure 5, comprising:
S501, TU Trunk Unit by the information reporting that carries the amplification autoradiolysis noise power of image intensifer and the corresponding relation of operating current to optical line terminal;
The message that S502, described optical line terminal report according to described TU Trunk Unit, calculates the pad value of trunk optical fiber between described TU Trunk Unit and described optical line terminal.In the embodiment of the present invention, the method for calculating can comprise following two kinds:
One, utilize the EONT of described TU Trunk Unit to report the uplink transmission power value of described EONT entrained in the message of OLT, calculate the pad value of trunk optical fiber
In EONT and OLT communication process, the light signal that its inner transmitter is launched is without up OA, so in the EONT upward signal that receives of OLT, there is no ASE noise.In the message that EONT uploads to OLT, can carry its uplink transmission power value, OLT just can measure the performance number of the light signal receiving, then by the uplink transmission power value of EONT, deduct the performance number of the light signal that OLT receives, can obtain the pad value of trunk optical fiber.For example, the transmission power level of EONT is+1dBm that the performance number of the light signal that OLT receives is-20dBm that the pad value of trunk optical fiber is+1dBm-(20dBm)=21dB so.
Two, according to the propagation delay time between OLT and EONT, calculate the pad value of trunk optical fiber
When EONT registers on OLT, need to find range, now OLT can launch a signal to EONT, EONT receives after this signal, returned at once OLT, OLT receives after the signal that EONT returns, utilize propagation delay time=(the time m-OLT that OLT transmits receives the signal that the EONT returns) ÷ 2 between OLT and EONT, can obtain the propagation delay time of light signal between EONT and OLT, then the refractive index to light signal according to the light velocity ÷ optical fiber in the transmission speed=vacuum of fiber middle light signal again, the transmission speed of fiber lengths=propagation delay time * fiber middle light signal, obtain the distance between EONT and OLT, again according to pad value=length * attenuation coefficient, calculate the pad value of trunk optical fiber.For example, through range finding, OLT knows that the propagation delay time between itself and EONT is 200us, and the light velocity in vacuum is 299792458 meter per seconds, and optical fiber is 1.4675 to the refractive index of 1310nm, and attenuation coefficient is 0.35dB/km, pad value=200 * 10 of trunk optical fiber
-6* 299792458 ÷ 1.4675 ÷ 1000 * 0.35=14.3dB.
S503, described optical line terminal, according to the ASE noise power of OA and the corresponding relation of operating current, in conjunction with predefined standard, are determined the working current value of described image intensifer;
In the embodiment of the present invention, described predefined standard can be: the ASE noise power of OA is less than the sensitivity of the receiver of described optical line terminal after the decay of trunk optical fiber between described TU Trunk Unit and described optical line terminal, and definite detailed process is: the sensitivity of the pad value <OLT receiver of the ASE noise power-value-trunk optical fiber under current OA operating current.As the sensitivity of OLT receiver is-28dBm, the pad value of trunk optical fiber is 20dB, so according to above formula, and the ASE noise power-value <-28dBm+20dB=-8dBm of OA.Then, according to the ASE noise power of OA and the mapping table of operating current, find the operating current that OA is suitable.
S504, described optical line terminal send to described TU Trunk Unit by the message that carries the working current value of described OA;
S505, described TU Trunk Unit, according to described working current value, arrange the operating current of OA in described TU Trunk Unit.
The method of using the embodiment of the present invention to provide, can be when light signal transmits by TU Trunk Unit, the impact of the ASE noise that reduces OA on the receiver of OLT.
The embodiment of the present invention can, in the registration process of EPON that comprises TU Trunk Unit, guarantee carrying out smoothly of ONT registration.Fig. 7 is a kind of register method schematic diagram that comprises the EPON of TU Trunk Unit that the embodiment of the present invention provides.With reference to figure 7, described method comprises:
S701, OLT issue sequence number (Serial Number, SN) request message in PON network, require not have the ONT of registration to upload its SN;
First S702, described serial number request message are received by the EONT in Extender, and described EONT uploads the response message that comprises its SN to OLT; Because Extender does not now activate and issues port, so other conventional ONT can not receive described serial number request message;
S703, OLT receive after response message, start the activation of integrated management ONT under this PON mouth, and EONT is carried out to special marking, take and show the ONT that it is integrated management;
S704, OLT and described EONT set up OMCI passage, and this passage is uploaded the monitoring message of Extender for EONT to OLT, and OLT issues the administrative messag of Extender to EONT;
S705, EONT upload the monitoring message of the corresponding relation of the ASE noise power that comprises in OA passband and operating current by OMCI passage.In the embodiment of the present invention, in this monitoring message, can also comprise the uplink transmission power value of EONT.In the embodiment of the present invention, can be also to upload at twice monitoring message, the monitoring message of once uploading comprises ASE noise power in OA passband and the corresponding relation of operating current, and the monitoring message that another time uploaded comprises the uplink transmission power value of EONT;
The message that S706, OLT upload according to described EONT, determines the working current value of image intensifer in Extender;
S707, OLT issue comprise described working current value administrative messag to Extender;
S708, described Extender arrange the operating current of image intensifer according to the working current value in administrative messag, and according to administrative messag, enable the port that issues of (activation) Extender;
S709, optical line terminal issue SN request message to the ONT connecing under Extender by described Extender;
, can be handed down to the ONT connecing under at least one herein, can certainly be all ONT.
S710, ONT register to OLT by Extender.
The ONT that receives SN request message herein, is sent and is comprised that the message of himself SN registers to OLT by Extender.
The embodiment of the present invention, by controlling the ASE noise power of image intensifer, can guarantee that the information of ONT can be identified at OLT place, has guaranteed carrying out smoothly of ONT registration, and has not increased the extra cost of Extender.Meanwhile, when the transmission of subsequent optical signal, due to the control to ASE noise, can guarantee better the relaying action of TU Trunk Unit.
Further, the embodiment of the present invention also provides the system of controlling the image intensifer in TU Trunk Unit in a kind of EPON.
Fig. 8 controls the system configuration schematic diagram of the image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention one.With reference to figure 8, described system comprises: TU Trunk Unit 10 and optical line terminal 20, wherein:
Described optical line terminal 20 comprises processing unit 23, described processing unit 23 comes from the message of described TU Trunk Unit 10 for basis, determine the working current value of the image intensifer 16 in TU Trunk Unit 10, and described working current value is sent to described TU Trunk Unit 10;
Described TU Trunk Unit 10, for according to the described working current value that comes from optical line terminal 20, arranges the operating current of described image intensifer 16.
In the embodiment of the present invention, described in come from TU Trunk Unit 10 message carry the ASE noise power of described image intensifer 16 and the corresponding relation of operating current.
Correspondingly, the embodiment of the present invention also provides a kind of device, and this device can obtain the ASE noise power of image intensifer and the corresponding relation of operating current.Figure 10 is a kind of structural representation that obtains the device of the amplification autoradiolysis noise power of image intensifer and the corresponding relation of operating current of the embodiment of the present invention.With reference to Figure 10, described device 100 comprises: current regulation unit 110, not under the condition of input optical signal, regulates the working current value of described image intensifer for the input at described image intensifer; Filter unit 120, one end connects the output of described image intensifer, for the output signal of described image intensifer is carried out to narrow-band filtering; Measuring light power unit 130, the output that connects described filter unit 120 for one end, be used for according to each working current value of described image intensifer, the amplification autoradiolysis noise power-value of measuring described filter unit 120 outputs, forms the amplification autoradiolysis noise power-value of described image intensifer and the corresponding relation of working current value.Use the device 100 of the embodiment of the present invention just can get the ASE noise power of image intensifer and the corresponding relation of operating current.
The embodiment of the present invention is not increasing the cost of TU Trunk Unit, does not affect on the basis of image intensifer performance and can reach the ASE noise of controlling image intensifer.
Fig. 9 controls the system configuration schematic diagram of image intensifer in TU Trunk Unit in the EPON of the embodiment of the present invention two.With reference to figure 9, described system comprises TU Trunk Unit 10 and optical line terminal 20, wherein:
Described TU Trunk Unit 10, comprises embedded Optical Network Terminal (EONT) 15 and image intensifer 16.Described TU Trunk Unit 10 is uploaded the message that carries the amplification autoradiolysis noise power of described image intensifer 16 and the corresponding relation of operating current to described optical line terminal 20.In the embodiment of the present invention, the amplification autoradiolysis noise power of image intensifer 16 and the corresponding relation of operating current are pre-recorded and be stored in EONT15.
Described optical line terminal 20, comprises memory cell 22, for storing the amplification autoradiolysis noise power of described image intensifer of described message and the corresponding relation of operating current; Processing unit 23, for determining the working current value of described image intensifer according to the corresponding relation of the ASE noise power of described image intensifer and operating current and predefined standard.In the embodiment of the present invention, described predefined standard can be: the ASE noise power of OA can produce decay by trunk optical fiber between described TU Trunk Unit and described optical line terminal, and the value of ASE noise power after trunk optical fiber decay is less than the sensitivity of the receiver of described optical line terminal.That is to say the sensitivity of the pad value <OLT receiver of the ASE noise power-value-trunk optical fiber under current OA operating current.
Described processing unit 23 determines that the detailed process of the working current value of described image intensifer can be, processing unit 23, according to the sensitivity of the pad value of trunk optical fiber between described TU Trunk Unit 10 and described optical line terminal 20 and the receiver of described optical line terminal 20, is determined the amplified spontaneous emission noise power of described image intensifer 16; Then according to the corresponding relation of the amplified spontaneous emission noise power of described image intensifer 16 and operating current, be back-calculated to obtain the working current value of described image intensifer 16.
In the embodiment of the present invention, processing unit 23 can also, for the message of uploading according to described TU Trunk Unit, calculate the pad value of trunk optical fiber between described TU Trunk Unit 10 and described optical line terminal 20.In the embodiment of the present invention, comprise following two kinds of modes:
One, in the message of uploading according to described TU Trunk Unit, the uplink transmission power value of entrained EONT is calculated the pad value of trunk optical fiber
In the EONT15 in TU Trunk Unit 10 and optical line terminal OLT 20 communication processs, the light signal that EONT15 internal transmitter is launched is without up OA, so in the uplink optical signal of the EONT that receives of OLT, there is no ASE noise.The message that TU Trunk Unit is uploaded to OLT comprises the uplink transmission power value of EONT.In optical line terminal OLT 20, also comprise measuring unit 24, for measuring the performance number of the light signal receiving.The uplink transmission power value that processing unit 23 equals EONT according to the decay of trunk optical fiber transmission deducts the performance number of the light signal that OLT receives, and calculates the pad value of trunk optical fiber.For example, the transmission power level of EONT is+1dBm that the performance number of the light signal that OLT receives is-20dBm that the pad value of trunk optical fiber is+1dBm-(20dBm)=21dB so.
Two, according to the propagation delay time between OLT and EONT, calculate the pad value of trunk optical fiber
When EONT registers on OLT, the flow process of need to finding range, now OLT can launch a signal to EONT, EONT receives after this signal, returned at once OLT, OLT receives after the signal that EONT returns, utilize propagation delay time=(the time m-OLT that OLT transmits receives the signal that the EONT returns) ÷ 2 between OLT and EONT, obtain the propagation delay time of light signal between EONT and OLT, then the refractive index to light signal according to the light velocity ÷ optical fiber in the transmission speed=vacuum of fiber middle light signal again, the transmission speed of fiber lengths=propagation delay time * fiber middle light signal, obtain the distance between EONT and OLT, again according to pad value=length * attenuation coefficient, calculate the pad value of trunk optical fiber.For example, through range finding, OLT knows that the propagation delay time between itself and EONT is 200us, the light velocity in vacuum is 299792458 meter per seconds, optical fiber is 1.4675 to the refractive index of 1310nm, attenuation coefficient is 0.35dB/km, pad value=200 * 10-6 * 299792458 ÷ 1.4675 ÷ 1000 * the 0.35=14.3dB of trunk optical fiber.
Illustrate processing unit 23 herein, and determine that the detailed process of the operating current of image intensifer 16 is: processing unit 23 is according to the noise power-value of the sensitivity calculations ASE of the pad value <OLT receiver of the ASE noise power-value-trunk optical fiber under current OA operating current.As the sensitivity of OLT receiver is-28dBm, the decay of trunk optical fiber is 20dB, so according to above formula, and the ASE noise level <-28dBm+20dB=-8dBm of OA.Then according to the ASE noise power of OA and the mapping table of operating current, find out the working current value that OA is suitable.
Then, optical line terminal 20 is handed down to TU Trunk Unit 10 by the message that comprises above-mentioned OA working current value, and TU Trunk Unit arranges the operating current of image intensifer 16 in described TU Trunk Unit 10 according to described working current value.
The system of the embodiment of the present invention, can be when light signal transmits by TU Trunk Unit, the impact of the ASE noise of the image intensifer in elimination TU Trunk Unit on the receiver of OLT.Especially in the registration process of EPON, use the embodiment of the present invention, can guarantee the ONT not impact of the ASE noise of photo-detector amplifier and registration smoothly.
Certainly, the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (9)
1. in EPON, control a method for the image intensifer in TU Trunk Unit, comprising:
According to the message that comes from described TU Trunk Unit, determine the working current value of described image intensifer, in described message, carry: the amplified spontaneous emission noise power of described image intensifer and the corresponding relation of operating current;
Described working current value is sent to described TU Trunk Unit, indicate described TU Trunk Unit according to described working current value, the operating current of described image intensifer is set;
Wherein, described basis comes from the message of described TU Trunk Unit, determines the working current value of described image intensifer, specifically comprises:
According to described message and predefined standard, determine the working current value of described image intensifer; Described predefined standard is that the value of described amplification autoradiolysis noise power after trunk optical fiber decay, is less than the sensitivity of the receiver of optical line terminal; Or,
Calculate the pad value of trunk optical fiber between described TU Trunk Unit and optical line terminal;
According to the sensitivity of the receiver of the pad value of described trunk optical fiber and described optical line terminal, determine the amplified spontaneous emission noise performance number of described image intensifer;
According to the amplified spontaneous emission noise power of described image intensifer and the corresponding relation of operating current, obtain the working current value of described image intensifer.
2. method according to claim 1, is characterized in that, the pad value of trunk optical fiber between the described TU Trunk Unit of described calculating and described optical line terminal, comprising:
According to the propagation delay time of light signal between described TU Trunk Unit and described optical line terminal,, the transmission speed of fiber middle light signal and optical fiber attenuation coefficient, determine the pad value of described trunk optical fiber.
3. method according to claim 1, is characterized in that, described message also carries the uplink transmission power value of the embedded Optical Network Terminal in described TU Trunk Unit;
The pad value of trunk optical fiber between the described TU Trunk Unit of described calculating and described optical line terminal, comprising:
The performance number of the light signal receiving according to the uplink transmission power value of described embedded Optical Network Terminal and described optical line terminal, determines the pad value of described trunk optical fiber.
4. method according to claim 1, is characterized in that, described method also comprises:
Obtain the amplification autoradiolysis noise power of described image intensifer and the corresponding relation of operating current, be specially:
During the input no signal of described image intensifer, the output end signal of described image intensifer is sent to light power meter by optics narrow band filter;
Regulate successively the operating current of described image intensifer and record its working current value and corresponding described light power meter on numerical value.
5. a passive optical network, is characterized in that, comprises optical line terminal and TU Trunk Unit, wherein:
Described optical line terminal comprises processing unit, described processing unit comes from the message of described TU Trunk Unit for basis, determine the working current value of the image intensifer in described TU Trunk Unit, described working current value is sent to described TU Trunk Unit, in described message, carry: the amplified spontaneous emission noise power of described image intensifer and the corresponding relation of operating current;
Described TU Trunk Unit, for according to the described working current value that comes from described optical line terminal, arranges the operating current of described image intensifer;
Wherein, described optical line terminal also comprises:
Memory cell, for storing the amplified spontaneous emission noise power of described image intensifer and the corresponding relation of operating current;
Wherein, described processing unit, specifically for according to described message and predefined standard, determines the working current value of described image intensifer; Described predefined standard is that the value of described light amplification radiated noise power after trunk optical fiber decay is less than the sensitivity of the receiver of described optical line terminal.
6. system according to claim 5, it is characterized in that, described processing unit, also for according to the propagation delay time of light signal between described TU Trunk Unit and described optical line terminal, the transmission speed of fiber middle light signal and optical fiber attenuation coefficient, calculate the pad value of described trunk optical fiber.
7. according to the system of claim 5, it is characterized in that, described in come from the message of described TU Trunk Unit and carry: the uplink transmission power value of the embedded Optical Network Terminal in described TU Trunk Unit.
8. system according to claim 7, is characterized in that, described optical line terminal also comprises measuring unit, for measuring the performance number of the light signal receiving;
Described processing unit, also, for according to the performance number of the light signal of the uplink transmission power value of the embedded Optical Network Terminal of described TU Trunk Unit and the measurement of described measuring unit, calculate the pad value of trunk optical fiber between described TU Trunk Unit and described optical line terminal.
9. a device that obtains the amplification autoradiolysis noise power of image intensifer and the corresponding relation of operating current, it is characterized in that, the described corresponding relation obtaining for basis, determine the working current value of described image intensifer, and then according to the described working current value of determining, the operating current of described image intensifer is set, and described device comprises:
Current regulation unit, not under the condition of input optical signal, regulates the working current value of described image intensifer for the input at described image intensifer;
Filter unit, one end connects the output of described image intensifer, for the output signal of described image intensifer is carried out to narrow-band filtering;
Measuring light power unit, one end connects the output of described filter unit, be used for according to each working current value of described image intensifer, measure the amplification autoradiolysis noise power-value of described filter unit output, form the amplification autoradiolysis noise power-value of described image intensifer and the corresponding relation of working current value, described corresponding relation is stored in the memory of the EONT in TU Trunk Unit.
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| WO2013097123A1 (en) * | 2011-12-28 | 2013-07-04 | 华为技术有限公司 | Optical line terminal and method thereof for processing amplified spontaneous emission |
| MX343868B (en) | 2012-12-18 | 2016-11-24 | Huawei Tech Co Ltd | Communication method, system and device for optical network system. |
| CN107465541B (en) * | 2017-07-26 | 2020-12-15 | 烽火通信科技股份有限公司 | GPON remote equipment and management method thereof |
| 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 |
| CN113541816B (en) * | 2021-07-27 | 2022-04-26 | 烽火通信科技股份有限公司 | Optical signal processing method and device and SOA control unit |
| CN117527067A (en) * | 2024-01-05 | 2024-02-06 | 深圳国人无线通信有限公司 | Method for detecting optical fiber transmission quality and repeater system |
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| US6606191B1 (en) * | 2002-05-13 | 2003-08-12 | Corning Incorporated | Method for controlling performance of optical amplifiers |
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| CN1965510A (en) * | 2004-06-10 | 2007-05-16 | 波科海姆技术公共有限公司 | Multistage optical amplifier and method to compensate for amplified spontaneous emission |
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