CN1272923C - Light relay station device for light transmission, system and its automatic fain regulating method - Google Patents
Light relay station device for light transmission, system and its automatic fain regulating method Download PDFInfo
- Publication number
- CN1272923C CN1272923C CN 200410086317 CN200410086317A CN1272923C CN 1272923 C CN1272923 C CN 1272923C CN 200410086317 CN200410086317 CN 200410086317 CN 200410086317 A CN200410086317 A CN 200410086317A CN 1272923 C CN1272923 C CN 1272923C
- Authority
- CN
- China
- Prior art keywords
- optical
- station
- dish
- optical power
- supervisory channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The present invention relates to a method for automatically regulating the amplifying gain of the optical power of relay stations in wavelength division multiplexing optical transmission systems and a relay station device using the method. The method transfers the output optical power of an upstream station to a downstream station, the output optical power of the upstream and the input optical power of the downstream station are calculated in the downstream station, and the obtained differential value is line attenuation in the region section. If the actually calculated line attenuation is larger than the range of a predetermined value, the attenuation of an adjustable optical attenuator in the downstream station is regulated, and the output optical power of the downstream station is stable. Real-time control is carried out by the method and the device of the present invention through line device software, reaction can be carried out to the instability of an optical transmission system caused by the increase of line loss in quite short time without carrying out intervention by network management, and the effect that the optical power gain of systems can be regulated automatically can be reached with low cost.
Description
Technical field
The present invention relates to the Gain Automatic control method of the light amplification of light-repeating ship in the optical transmission system, relate to the method and the employed equipment that automatically adjust for relay station luminous power gain amplifier in the optical transmission wavelength-division multiplex system particularly.
Background technology
In existing wave division multiplexing transmission system, generally adopt and contain the luminous power amplification relay station of adjustable optical attenuator (VOA) in conjunction with the gain constant image intensifer, variation by adjustable attenuator (VOA) attenuation keeps that the circuit luminous power is in a rational numerical in the transmission system, thus raising property make an uproar than etc. transmission performance.For wavelength division multiplexing (WDM) system, relay station should lock gain amplifier when radio frequency channel increased or reduces, and adjusted in real time and only should gain when the circuit attenuation change.But the variable power that variable power that present relay station equipment can't cause radio frequency channel increase and decrease and other factors cause is carried out Real time identification, so can not utilize adjustable attenuator to realize that light puts the automatic adjusting of relay station light amplification gain in the practical engineering application.
The key that solves Gain Automatic adjustment problem in the present light place system be how to allow system in time discern light amplification dish input optical power reduce cause or cause because of the minimizing of number of channels because of line hepatitis consumption increases, the reason of having only correct identification input optical power to reduce, light amplification dish just can judge whether that automatically needs realize the change that gains by the attenuation of regulating VOA according to reason.
The prior art scheme is normally obtained the radio frequency channel quantity of transmitting in the circuit by special module or from network management information; come decision system whether to have increase and decrease radio frequency channel phenomenon to take place thus; this judgement is with performance number and radio frequency channel quantity separate detection; make the adjustment process very slow; and must regulate by webmaster control, can not automatically adjust by link self.Therefore, need improve light amplification disc apparatus in the existing system, can not carry out the problem that the light amplification gain is adjusted in real time automatically effectively according to the Line Attenuation situation to solve under the situation of the normal operation of whole system.
Summary of the invention
The purpose of this invention is to provide a kind of light-repeating ship equipment that is used for optical transmission system and automatic gain control method thereof with solve current optical transmission system without webmaster control just can not be voluntarily according to the problem of Line Attenuation real-time regulated optical amplification repeater station power output.Optical amplification system power regulating method of the present invention and equipment adapt to the day by day highly intelligentized networking demand of current wave division multiplexing transmission system, adjust the gain of optical amplification system more accurately and quickly, can keep the normal operation of whole system in real time, and guarantee under the non-interrupting service situation, to come burst or gradual luminous power attenuation in the compensated line by automatic adjustment to VOA.Simultaneously, method of the present invention is also judged because of the variable power that auto light power reduction (APR) process causes system, can the circuit optical power attenuation that the APR process causes not responded.Method and apparatus of the present invention does not need to control by webmaster, is regulated automatically by the chain pipeline equipment fully, has realized efficient hardware control with very little cost.
The basic principle of optical transmission system relay station automatic gain control method of the present invention is: mainly the cooperation of coiling by light amplification dish and Optical Supervisory Channel (OSC) realizes the real-time regulated to adjustable optical attenuator (VOA), promptly utilize the OSC channel to transmit each Output optical power that amplifies light amplification dish in the segment upstream relay stations and give downstream relay station, downstream relay station is according to station, the upstream output power information that receives, and in conjunction with self actual reception to main channel input optical power from upstream relay stations, judge whether attenuation big variation takes place in the amplification segment between station, upstream and the downstream stations, then controlling the interior VOA of downstream stations moves, thereby keep the stable of downstream stations Output optical power, and then guarantee the operate as normal of overall optical transmission system.Judging when amplifying in the segment Line Attenuation between two stations, at first calculate station, upstream Output optical power and pass to downstream stations, calculate the our station input optical power in the downstream stations, station, upstream Output optical power is subtracted the downstream stations input optical power, the difference that obtains is the Line Attenuation in this segment, again Line Attenuation and scheduled circuit decay are compared, if the difference of the Line Attenuation of actual measuring and calculating and scheduled circuit decay is greater than predetermined value, then adjust the attenuation of adjustable optical attenuator in the downstream stations, guarantee that the downstream stations Output optical power is stable.
For transmitting the Output optical power information of each relay station, the light amplification dish should be informed adjacent downstream stations by OSC (Optical Supervisory Channel) with the our station Output optical power in each upstream relay stations.This just needs the interior light amplification dish of upstream relay stations that our station Output optical power value is encoded, and code stream is sent to the OSC dish by the backboard terminal, is transmitted by OSC dish framing.The auto light power that the transmission utilization of this Output optical power coded message transmits on OSC usually lowers (APR) byte.Be sent to the light amplification dish by the backboard terminal after adjacent sites OSC dish in downstream receives code stream, the decoding of light amplification dish obtains optical power value, controls the control that VOA realizes gain by corresponding algorithm automatically by the light amplification dish again, and needn't participate in control by the webmaster dish.In order not influence the APR process, when FPGA encodes to power output numerical value in the OSC dish, should avoid using the code of APR process regulation use, be about to the employed code setting of APR process for prohibiting word.On the OSC channel, the transmission priority of APR code that process is used should the specific power output value transmission priority height of coding, in a single day the APR request promptly occurs, the OSC dish is preferentially carried out the transmission of APR progress information immediately, so that the light amplification dish can normally be carried out the APR process immediately.
Relay station automatic gain control method of the present invention comprises step:
The disk controller of station, upstream light amplification dish is gathered the Output optical power numerical value of our station, the clock that the field programmable gate array that this numerical value is delivered to our station light amplification dish provides according to the optical supervisory channel dish and frame head information is encoded to Output optical power numerical value and synchronously;
Light amplification dish in station, upstream passes to our station Optical Supervisory Channel dish with the signal bit stream behind the Output optical power coding, utilizes Optical Supervisory Channel to be transferred to downstream stations Optical Supervisory Channel dish by the Optical Supervisory Channel dish after with this signal bit stream framing;
Downstream stations Optical Supervisory Channel dish receives the signal bit stream from the station, upstream, signal bit stream is passed to our station light amplification dish after separating frame, is obtained station, upstream Output optical power numerical value and is passed to the disk controller of our station by the field programmable gate array decoding of light amplification dish;
The disk controller of downstream stations light amplification dish is gathered the input optical power numerical value of our station, and carry out subtraction with station, the upstream Output optical power numerical value that is received, obtain the actual attenuation amount of circuit, if the difference between circuit actual attenuation amount that calculates and the circuit benchmark attenuation is greater than predetermined threshold value, also need further to judge whether to be in auto light power and reduce state, reduce state if be in auto light power, then do not regulate the attenuation of adjustable optical attenuator, do not reduce state if be not in auto light power, then adjustable optical attenuator in the disk controller control panel is stable with the Output optical power that keeps our station.
Above-mentioned relay station automatic gain control method of the present invention is characterized in that: Optical Supervisory Channel uses the optical channel transmission of wavelength 1510 nanometers.
Above-mentioned relay station automatic gain control method of the present invention is characterized in that: pass through the backboard communicated data signal on the relay station between Optical Supervisory Channel dish and the light amplification dish.
Above-mentioned relay station automatic gain control method of the present invention is characterized in that: when upstream relay stations is passed through Optical Supervisory Channel relay station transmission downstream Output optical power information, use the auto light power in the Optical Supervisory Channel to reduce byte.
The relay station equipment that carries out the automatic gain adjusting of the present invention comprises:
The Optical Supervisory Channel dish, this Optical Supervisory Channel dish is connected with the light amplification dish through backboard, to the Output optical power code stream framing from light amplification dish field programmable gate array, and the monitor message frame that will comprise our station Output optical power code stream is transferred to downstream stations by Optical Supervisory Channel;
The light amplification dish, by light amplification disk controller, field programmable gate array, erbium-doped fiber amplifier, adjustable optical attenuator, go into photodetector, the bright dipping detector is formed;
Wherein, go out photodetector, detect the Output optical power of our station, and send field programmable gate array to;
Go into photodetector, detect input optical power, and gather input optical power numerical value by disk controller;
Field programmable gate array, to encoding from the luminous power numerical value that goes out photodetector, and the signal bit stream after will encoding passes to our station Optical Supervisory Channel dish, field programmable gate array also will be decoded from station, the upstream Output optical power coded data of Optical Supervisory Channel dish, and station, decoded upstream Output optical power numerical value is transferred to disk controller;
Disk controller, calculate the difference of station, upstream Output optical power numerical value and our station input optical power numerical value, this difference is represented actual Line Attenuation amount, actual track attenuation and benchmark attenuation are carried out subtraction, if the difference that calculates is greater than predetermined value, also need further to judge whether to be in auto light power and reduce state, reduce state if be in auto light power, then do not regulate the attenuation of adjustable optical attenuator, do not reduce state if be not in auto light power, then the attenuation of adjustable optical attenuator in the control panel keeps the Output optical power of our station stable.
The relay station equipment that carries out the automatic gain adjusting of the present invention is characterized in that: also comprise optical splitter and splicer,
Optical splitter, with go into photodetector and be connected with the Optical Supervisory Channel dish, will be from Optical Supervisory Channel radio frequency channel light signal in the optical transmission line of station, upstream and active channel separate optical signals, and with Optical Supervisory Channel radio frequency channel optical signal transmission to the Optical Supervisory Channel dish, with the active channel optical signal transmission to the light amplification dish;
Splicer and is gone into photodetector and is connected with the Optical Supervisory Channel dish, will merge from the Optical Supervisory Channel radio frequency channel light signal of the light monitoring panel of our station and active channel light signal from our station light amplification dish to be transferred to optical transmission line.
The relay station equipment that carries out the automatic gain adjusting of the present invention, it is characterized in that: described optical splitter separates the Optical Supervisory Channel radio frequency channel of 1510 nanometers with main active channel, and described splicer merges the Optical Supervisory Channel radio frequency channel and the main active channel of 1510 nanometers.
Utilize method and apparatus of the present invention, control in real time by line facility hardware, not needing webmaster just to intervene can reach with very low cost the self-adjusting effect of system's optical power gain to because line hepatitis consumption increases the optical transmission system instability that causes makes a response in the quite short time.Because the amplification segment that only changes at line hepatitis consumption is controlled and is regulated, do not relate to other any segment of upstream and downstream, stable operation has guarantee more reliably to optical transmission system, has strengthened the intelligent degree of wavelength-division multiplex system greatly, has made things convenient for the engineering maintenance of equipment.
Description of drawings
Fig. 1 is to use the schematic diagram of the optical transmission system of relay station equipment of the present invention;
Fig. 2 is the schematic diagram of relay station equipment structure of the present invention;
Fig. 3 is the flow chart of relay station automatic gain control method of the present invention.
Embodiment
Fig. 1 is to use the schematic diagram of the optical transmission system of relay station equipment of the present invention, after the radio frequency channel and active channel merging of figure middle and upper reaches station with Optical Supervisory Channel, passes to downstream stations through fibre circuit.
Fig. 2 is the structural representation of relay station equipment of the present invention.Among Fig. 2, Output optical power is finished by the bright dipping detection module, after the disk controller of light amplification dish (BCT) collects the our station Output optical power, carry out synchronous coding by the field-programmable in the light amplification dish (FPGA) device according to clock and frame head information that the OSC dish provides, signal bit stream behind the coding passes to the OSC dish by backboard and carries out framing, and utilizes the optical channel of 1510 nano wave lengths to be sent to adjacent downstream stations.OSC in adjacent downstream station dish receives station, upstream Output optical power information, thereby the FPGA that is sent to our station light amplification dish by backboard again decodes and obtains upstream adjacent sites Output optical power information.Input optical power detects and is finished by the light inlet detection module among Fig. 2, the coding of optical power value is finished by FPGA, FPGA communicates by letter with obtaining whether begin to regulate the judgment condition of VOA and the request that whether starts the APR process by the backboard terminal with the OSC dish simultaneously, after FPGA adjudicates through processing information is mail to the disk controller (BCT) of light amplification dish, whether VOA moves by BCT control.Be example with the line amplifier that uses erbium-doped fiber amplifier (EDFA) among Fig. 2, also the structure that can use power amplifier to combine with band amplifier.
Fig. 3 is the flow chart of relay station automatic gain control method of the present invention.This method with downstream relay station as determination point, system's operation just often after the engineering opening, station, upstream outlet luminous power PO and downstream stations inlet luminous power PI kept stable, this moment, how route of pipe line medium wave road number did not change, both difference PD keep stable, as benchmark attenuation PR, this benchmark attenuation PR can set or be gone out according to the numerical computations under the circuit stable state voluntarily by disk controller artificial on the webmaster with the power difference of this normal condition.In service at optical transmission system, the light amplification dish of each relay station can detect Output optical power and the input optical power of self in real time, and regulates the adjustable optical attenuator of our station according to method step shown in Figure 3.
In method shown in Figure 3, judge wherein PD also needs to set in advance a threshold value when whether being tending towards constant, promptly the difference of PD and PR is just carried out the adjusting to the VOA attenuation greater than predetermined threshold value.In addition, in case upstream, downstream relay station enter the APR process, the OSC dish can enter the APR rules automatically, and the light amplification dish of control local terminal and opposite end is carried out the APR process.When being in the APR process, do not regulate by the light amplification dish command operation of VOA.After the APR process was recovered, OSC continued to transmit upstream light amplification dish Output optical power value, and system proceeds automatic gain control process.
In equipment of the present invention and method implementation process, the light amplification dish is exported self, input optical power all will detect, and its detected value requires accurately as far as possible, does not especially occur the fluctuation up and down of detected value under the light power stabilising situation.OSC dish in station, upstream takies the APR byte when transmitting our station Output optical power information to the adjacent downstream station, but during because Output optical power information encoded, with the employed code word of APR process as prohibiting word, and therefore prioritised transmission APR control word on the OSC channel can not influence the timely startup of APR process.Signal behind the OSC framing transmits by the light signal of 1510 nano wave lengths, separates frame after the downstream adjacent sites receives and obtains upstream adjacent sites Output optical power information by the decoding of light amplification dish.The downstream website is detecting the adjusting VOA attenuation step of not carrying out the inventive method under the situation that the our station input optical power do not have to change.Change above predetermined threshold at input optical power, also need by checking whether the upstream stations Output optical power changes, thereby judge what whether the input optical power variation was caused by circuit, only when circuit causes between two stations power attenuation difference to change greatly, just carry out the power adjustment, make that so also system's operation is more reliable and stable by disk controller (BCT) control VOA.
Those skilled in the art are when utilizing the present invention to be used for the relay station equipment of Wave division multiplexing optical transmission system and employed automatic gain control method thereof; may carry out adaptive change on present device and method basis, these changes also all belong to the application's protection range.The application's protection range is specifically limited by claims.
Claims (7)
1. automatic gain control method that is used for the Wave division multiplexing optical transmission system relay station comprises step:
The disk controller of station, upstream light amplification dish is gathered the Output optical power numerical value of our station, the clock that the field programmable gate array that this numerical value is delivered to our station light amplification dish provides according to the optical supervisory channel dish and frame head information is encoded to Output optical power numerical value and synchronously;
Light amplification dish in station, upstream passes to our station Optical Supervisory Channel dish with the signal bit stream behind the Output optical power coding, utilizes Optical Supervisory Channel to be transferred to downstream stations Optical Supervisory Channel dish by the Optical Supervisory Channel dish after with this signal bit stream framing;
Downstream stations Optical Supervisory Channel dish receives the signal bit stream from the station, upstream, signal bit stream is passed to our station light amplification dish after separating frame, is obtained station, upstream Output optical power numerical value and is passed to the disk controller of our station by the field programmable gate array decoding of light amplification dish;
The disk controller of downstream stations light amplification dish is gathered the input optical power numerical value of our station, and carry out subtraction with station, the upstream Output optical power numerical value that is received, obtain the actual attenuation amount of circuit, if the difference between circuit actual attenuation amount that calculates and the circuit benchmark attenuation is greater than predetermined threshold value, also need further to judge whether to be in auto light power and reduce state, reduce state if be in auto light power, then do not regulate the attenuation of adjustable optical attenuator, do not reduce state if be not in auto light power, then adjustable optical attenuator in the disk controller control panel is stable with the Output optical power that keeps our station.
2. relay station automatic gain control method according to claim 1 is characterized in that: Optical Supervisory Channel uses the transmission of wavelength 1510 nanometer optical channels.
3. relay station automatic gain control method according to claim 1 is characterized in that: pass through the backboard communicated data signal on the relay station between Optical Supervisory Channel dish and the light amplification dish.
4. relay station automatic gain control method according to claim 1 is characterized in that: when upstream relay stations is passed through Optical Supervisory Channel relay station transmission downstream Output optical power information, use the auto light power in the Optical Supervisory Channel to reduce byte.
5. a relay station equipment that is used for Wave division multiplexing optical transmission system comprises:
The Optical Supervisory Channel dish, this Optical Supervisory Channel dish is connected with the light amplification dish through backboard, to the Output optical power code stream framing from light amplification dish field programmable gate array, and the monitor message frame that will comprise our station Output optical power code stream is transferred to downstream stations by Optical Supervisory Channel;
The light amplification dish, by light amplification disk controller, field programmable gate array, erbium-doped fiber amplifier, adjustable optical attenuator, go into photodetector, the bright dipping detector is formed;
Wherein, go out photodetector, detect the Output optical power of our station, and send field programmable gate array to;
Go into photodetector, detect input optical power, and gather input optical power numerical value by disk controller;
Field programmable gate array, to encoding from the luminous power numerical value that goes out photodetector, and the signal bit stream after will encoding passes to our station Optical Supervisory Channel dish, field programmable gate array also will be decoded from station, the upstream Output optical power coded data of Optical Supervisory Channel dish, and station, decoded upstream Output optical power numerical value is transferred to disk controller;
Disk controller, calculate the difference of station, upstream Output optical power numerical value and our station input optical power numerical value, this difference is represented actual Line Attenuation amount, actual track attenuation and benchmark attenuation are carried out subtraction, if the difference that calculates is greater than predetermined value, also need further to judge whether to be in auto light power and reduce state, reduce state if be in auto light power, then do not regulate the attenuation of adjustable optical attenuator, do not reduce state if be not in auto light power, then the attenuation of adjustable optical attenuator in the control panel keeps the Output optical power of our station stable.
6. relay station equipment according to claim 5 is characterized in that: also comprise optical splitter and splicer,
Optical splitter, with go into photodetector and be connected with the Optical Supervisory Channel dish, will be from Optical Supervisory Channel radio frequency channel light signal in the optical transmission line of station, upstream and active channel separate optical signals, and with Optical Supervisory Channel radio frequency channel optical signal transmission to the Optical Supervisory Channel dish, with the active channel optical signal transmission to the light amplification dish;
Splicer and is gone into photodetector and is connected with the Optical Supervisory Channel dish, will merge from the Optical Supervisory Channel radio frequency channel light signal of the light monitoring panel of our station and active channel light signal from our station light amplification dish to be transferred to optical transmission line.
7. relay station equipment according to claim 5 is characterized in that: described optical splitter separates the Optical Supervisory Channel radio frequency channel of 1510 nanometers with main active channel, and described splicer merges the Optical Supervisory Channel radio frequency channel and the main active channel of 1510 nanometers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410086317 CN1272923C (en) | 2004-10-25 | 2004-10-25 | Light relay station device for light transmission, system and its automatic fain regulating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410086317 CN1272923C (en) | 2004-10-25 | 2004-10-25 | Light relay station device for light transmission, system and its automatic fain regulating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588828A CN1588828A (en) | 2005-03-02 |
| CN1272923C true CN1272923C (en) | 2006-08-30 |
Family
ID=34605173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410086317 Expired - Fee Related CN1272923C (en) | 2004-10-25 | 2004-10-25 | Light relay station device for light transmission, system and its automatic fain regulating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1272923C (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453273B (en) * | 2007-12-07 | 2012-01-25 | 华为海洋网络有限公司 | Optical relay device and bidirectional service transmission method |
| CN102891720B (en) * | 2012-10-19 | 2015-05-13 | 烽火通信科技股份有限公司 | Method for automatically regulating optical power |
| CN102946282B (en) * | 2012-12-07 | 2016-01-13 | 烽火通信科技股份有限公司 | Optical transmission system, light Transmit-Receive Unit and coincidence frequency method of adjustment thereof |
| CN105812066B (en) * | 2014-12-31 | 2018-07-20 | 海思光电子有限公司 | Control the method and apparatus and photoreceiver of photoreceiver |
| CN105871455B (en) * | 2016-05-31 | 2018-08-28 | 国网新疆电力公司阿勒泰供电公司 | The EDFA devices of band OSC amplifications for optical link protecting system |
| CN108234016B (en) * | 2016-12-09 | 2023-01-17 | 中兴通讯股份有限公司 | Optical network protection control method, device and network management server |
| CN108039915B (en) * | 2017-12-13 | 2019-08-13 | 武汉电信器件有限公司 | A kind of cascade variable optical power unit fast synergistic control method and device |
| CN109327262B (en) * | 2018-10-26 | 2022-02-18 | 武汉光迅科技股份有限公司 | APR (advanced peripheral component interconnect) implementation method and device under OSC (open channel monitoring) free monitoring mechanism |
| CN112217568B (en) * | 2020-09-18 | 2022-03-08 | 武汉光迅科技股份有限公司 | Optical signal processing device and communication system |
| CN113315597B (en) * | 2021-05-31 | 2022-09-09 | 烽火通信科技股份有限公司 | Method and device for automatically compensating attenuation of fiber cable in wavelength division system |
| CN113691346B (en) * | 2021-08-20 | 2024-05-17 | 国家电网有限公司信息通信分公司 | Optical power adjusting unit, device, system and method |
| CN114205047A (en) * | 2021-12-10 | 2022-03-18 | 中国电信股份有限公司 | Automatic configuration method and device for optical multiplexing section |
| CN116647276A (en) * | 2022-02-16 | 2023-08-25 | 中兴通讯股份有限公司 | Channel power control method, control equipment and storage medium of optical network |
| CN115001582B (en) * | 2022-05-26 | 2024-02-27 | 武汉光迅电子技术有限公司 | Control method and device of variable optical attenuator |
-
2004
- 2004-10-25 CN CN 200410086317 patent/CN1272923C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1588828A (en) | 2005-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1272923C (en) | Light relay station device for light transmission, system and its automatic fain regulating method | |
| EP0873605B1 (en) | Transmitting supervisory messages from a fiber amplifier | |
| CN101296034B (en) | Method and apparatus for transmission of monitoring information, passive optical network system | |
| CN101296035B (en) | Monitoring system, optical transmitting/receiving device and monitoring level setting method | |
| US6798567B2 (en) | Method and apparatus for controlling power transients in an optical communication system | |
| JPH03171763A (en) | Digital radio relay method and adjustment of transmission power in digital radio relay method | |
| US20020101652A1 (en) | Optical amplifier for amplifying multi-wavelength light | |
| CN101159506B (en) | PON communication channel balancing method, device and system | |
| US7113709B2 (en) | Redundant WDM transmission system optical receiver with reduced variable optical attenuators and/or variable dispersion compensation modules | |
| GB2399718A (en) | Rate adaptive optical communication system | |
| CN1165444A (en) | Method of identifying faults in WDM optical networks | |
| CN101369853A (en) | Method and apparatus for chromatic dispersion compensation of optimized wavelength passage | |
| US6735725B1 (en) | Method and apparatus for performance management of a multiplexed transmission system | |
| NZ272806A (en) | Protection switching suppression in digital transmission systems | |
| WO2019174476A1 (en) | Feedback tuning method and device for beyond-100m wdm transmission system | |
| US6973601B2 (en) | System and method for automatic optimization of optical communication systems | |
| CN100499438C (en) | Wave-division multiplexing optical network luminous power control method | |
| CN101359965B (en) | Method and apparatus optimizing determination level of optical receiver | |
| CN1256822C (en) | Light power automatic control method | |
| CN115733557A (en) | Adaptive digital domain compensation system and compensation method for optical signal transmission damage | |
| CN1585307A (en) | System and method for dynamic control of power loss by contrapropagation of a supervisory channel | |
| US6556837B1 (en) | Closed-loop transmitting power control method using variable updating amount | |
| CN1489324A (en) | Channel power controlling method in WDM system | |
| EP1830491A1 (en) | Adaptive optical receiving device and the method thereof | |
| CN101714901B (en) | Method and device for optimizing wavelength division multiplexing power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060830 Termination date: 20191025 |