CN101453266B - Laser security protection method and apparatus in optical communication system - Google Patents
Laser security protection method and apparatus in optical communication system Download PDFInfo
- Publication number
- CN101453266B CN101453266B CN2008101896711A CN200810189671A CN101453266B CN 101453266 B CN101453266 B CN 101453266B CN 2008101896711 A CN2008101896711 A CN 2008101896711A CN 200810189671 A CN200810189671 A CN 200810189671A CN 101453266 B CN101453266 B CN 101453266B
- Authority
- CN
- China
- Prior art keywords
- signal
- low
- node
- optical
- amplifier
- 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.)
- Active
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The invention discloses a laser safety protection method and a laser safety protection device in an optical communication system, which belong to the field of laser safety. To solve danger problems existing on application occasions of a raman amplifier or a remote pump amplifier that whether a network breaks down and whether the network has laser leakage fail to be correctly judged through a mode of detecting optical power, the invention provides a method, which comprises the following steps: each path of optical channel signal bears a low-frequency identification signal through the low-frequency small-amplitude modulation to each path of optical channel in an optical fiber, and the normality of an upstream optical fiber link can be judged if any low-frequency identification signal is detected at a downstream node, or else the upstream optical fiber link is considered to be faulty further to control the output of optical power of the node to achieve the aim of laser safety. The invention also provides the laser safety protection device in the optical communication system, which is used for realizing the safety protection of laser.
Description
Technical field
The present invention relates to laser safety field, laser security protection method and device in particularly a kind of optical communication system.
Background technology
Because laser direction property is good, the intensity on its outbound course is high especially, so big especially to the threat of human eye.Present used laser in the communication system, because its Wavelength distribution is outside visible-range, for example near shortwave 870nm, long wave 1310nm and the 1550nm, human eye can't directly be seen beam distribution, so especially big to the threat of human eye.After EDFA (Erbium-Doped Fiber Amplifier-erbium-doped fiber amplifier) and WDM (Wavelength Division Multiplexing-wavelength division multiplexing) technological invention; The optical signal power that is carried in the optical fiber is than traditional SDH (Synchronous Digital Hierarchy-SDH) equipment; Its power output is higher; And a lot of devices use raman amplifier that light signal is compensated amplification in the present communication system; The optical signal power that optical fiber carried like this even met or exceeded 30dBm, the threat that strong like this luminous power is serious telecommunication system operation and maintenance personnel's safety.In the IEC60825 standard safe class of laser aid and equipment is divided; And concrete operation measure and secure ID have been stipulated; ITU-T has worked out G.664 standard to the laser safety problem in the communication system specially; Having proposed optical communication apparatus can reduce Output optical power automatically and even close laser output, i.e. APR (reduction of Automatic Power Reduction-auto light power) and APSD (shutoff of Automatic Power Shutdown-auto light power) when laser emission occurring.
Auto light power reduces APR through on optical communication equipment, increasing the Link State detection and controlling laser output power and accomplish; Its implementation is: when an optical cable breaks down possibly cause laser to leak the time; Downstream node on the down direction will detect luminous power and lose; Judge upstream link and have the laser spillage risk, be reduced in the power output of up direction, upstream node is after the power that detects downstream node on the up direction reduces; Also can reduce the power output on the down direction opposite, leak the danger that causes personal injury thereby reduced laser with up direction.As shown in Figure 1; When breaking down possibly cause the laser spillage risk time to optical fiber in the west from Node B to node A; The west of node A can detect the light signal that Node B comes to amplifier and lose; There is the laser spillage risk in its meeting predicate node B to the optical fiber link of node A, and possibly there is the laser spillage risk in node A equally to the optical fiber of Node B simultaneously, and the east orientation amplifier of notice node A reduces Output optical power; So that node A leaks the safe class that meets the IEC60825 prescribed by standard to the laser in the Node B, protection Operation and Maintenance personnel's safety.Node B east orientation amplifier can detect the reduction of east orientation optical signal power equally or lose afterwards; It also can carry out identical process; Notice Node B west reduces output to amplifier, so that Node B to the laser among the node A leaks the safe class that meets the IEC60825 prescribed by standard.The implementation of APSD and the implementation of APR are similar, and difference is that it directly closes laser or amplifier output, rather than reduces power output to being lower than a certain predefined value.
The APR of existing communication device and the implementation of APSD all are whether to be lower than certain thresholding through the luminous power that detection receives basically; And then judge whether link the danger that laser leaks can take place; In case detecting the luminous power of receiving on the light direction occurs unusual; The then luminous power output in horse back reduction or the shutoff had in the other direction both guaranteed that the safety standard requirement was satisfied in the laser leakage on the opposite direction, can notify again side apparatus is also carried out the corresponding protection measure.But only can't resolve the APR problem that exists in raman amplifier or the remote optical pumping amplifier application scenario through the luminous power detection mode, as shown in Figure 2, in having used raman amplifier or remote optical pumping amplifier occasion; Regular meeting is input to certain pump light in the optical fiber along the opposite direction of light signal; Though fault has taken place to optical fiber in Node B to the west of node A, for example disconnected fine, the danger that exists laser to leak; But the west at node A still can detect great luminous power to receiver side; Because some pump light can be reflected after pump light got into optical fiber, and oppositely stimulated Raman radiation also can produce noise light, is received by node A with the direction consistent with light signal; Whether this causes the luminous power detection mode can't correctly judge network breaking down, and the network danger that whether exists laser to leak.
To the problems referred to above; Proposed a lot of solutions now: a kind of scheme is to report dropout LOS to judge through the digital circuit layer; For example in WDM equipment, judge that Rule of judgment can be a majority voting mechanism through the LOS situation that OTU (Optical Transfer Unit-optical wavelength conversion element) reports; Having OTU over half to report the LOS alarm among a plurality of OTU in promptly working, also can be to decide by certain wavelength or set of wavelengths RST; Another kind of scheme is to control or modulate through the pair amplifier gross output; Let a kind of id signal of main optical path signaling bearer; Whether downstream node exists to judge whether upstream link breaks down through detecting this id signal, and then controls the Output optical power of this node, reaches the purpose of laser safety; This kind scheme has two kinds of implementation methods; The first loads a kind of id signal at the source end on to main optical path, and intermediate node only detects id signal, and it two is on the main optical path of each intermediate node, to load new id signal.But above two kinds of schemes all have significant limitation: though first kind of scheme has its one side easily, be only applicable to professional node up and down, promptly there is OTU in this node; For the image intensifer node; Because do not have about the business, thus the danger whether network exists laser to leak can't be detected, and also also there is inefficacy in OTU itself; The possibility that has the APR misoperation causes whole interrupted communication link; The implementation method one of second kind of scheme is not suitable for a plurality of nodes has professional up and down chain or looped network; In this case, the channel wavelength that source end main optical path comprises respectively by following road, causes no id signal existence in the main optical path of subsequent node at middle OADM (Optical Add/Drop Multiplexer-Optical Add/Drop Multiplexer) node; Therefore defencive function lost efficacy; Though the possibility that implementation method two can avoid implementation method one defencive function to lose efficacy, the overlapping meeting of a plurality of signs has a strong impact on the performance of Traffic Channel, if be chosen in the id signal that each node is wiped a node; Need extra cost, and performance difficulty.
Summary of the invention
To exist in raman amplifier or the remote optical pumping amplifier application scenario in order solving, can't correctly judge network through detection luminous power mode and whether break down, and whether network to exist the dangerous problem of laser leakage; The present invention proposes a kind of method; Modulate by a small margin through each road optical channel in the optical fiber is carried out low frequency, let each road optical channel signal all carry a kind of low frequency id signal, detecting wherein arbitrary low frequency id signal at downstream node is that decidable upstream fiber link is normal; Otherwise think the upstream fiber link occurs fault; And then control the luminous power output of this node, and reach the purpose of laser safety, said method comprising the steps of:
Steps A: when photo-emission source end node or OADM node traffic are set out on a journey; Each wavelength of optical signal of setting out on a journey is loaded low-frequency modulation signal; Make each road optical channel signal all carry a kind of low frequency id signal, the light signal of each optical channel closes the laggard optical channel of becoming owner of of ripple and transmits;
Step B: the arbitrary node on the key light channel is received and is closed wave optical signal; Carrying out beam split detects; Detect the existence of the low frequency id signal that arbitrary optical channel carried in the main optical signal; If arbitrary low frequency id signal exists, then arbitrary node judges that its upstream node does not break down to the optical fiber link of this node, and amplifier keeps normal output; If arbitrary low frequency id signal does not exist, then arbitrary node judges that its upstream node breaks down to the optical fiber link of this node, starts APR or APSD laser radiation process, reduces or turn-offs that this node is equidirectional to be exported with the luminous power of amplifier in the other direction;
Step C: the upstream and downstream node of said arbitrary node reduces or loses according to detecting luminous power, starts APR or APSD laser radiation process, reduce or turn-off separately node equidirectional with the luminous power output of amplifier in the other direction.
Said step B specifically comprises: the arbitrary node on the key light channel detects arbitrary said low frequency id signal, and the amplifier of said arbitrary node keeps normal output.
Said step B specifically comprises: the arbitrary node on the key light channel does not detect arbitrary said low frequency id signal, and said arbitrary node reduces or turn-offs equidirectional luminous power with the opposite direction amplifier and export.
The frequency of said low frequency id signal is less than 1MHz.
The modulation depth of said low frequency id signal is 3-5%.
The present invention also provides laser safeguard protection device in a kind of optical communication system, and said device comprises the low-frequency modulation signal load-on module, closes the mode piece, spectral module, low-frequency modulation signal detection module and amplifier control module;
Said low-frequency modulation signal load-on module is used for when photo-emission source end node or OADM node traffic are set out on a journey, each wavelength of optical signal of setting out on a journey being loaded low-frequency modulation signal;
The said mode piece that closes is used for the light signal of each optical channel is closed ripple;
Said spectral module is used for separating the sub-fraction light signal from the key light channel, as sensed light signal, and very little to the influence of the service signal on the key light channel;
Said low-frequency modulation signal detection module is used for detecting the existence of closing the low frequency id signal that the arbitrary optical channel of wave optical signal carried, and testing result is sent to said amplifier control module;
Said amplifier control module is used for the testing result according to said low-frequency modulation signal detection module transmission, the luminous power output of control amplifier.
Said low-frequency modulation signal load-on module comprises the low-frequency modulation signal generation unit, and said low-frequency modulation signal generation unit is used to generate low-frequency modulation signal.
Said amplifier control module comprises the step-down amplifier output unit, and said step-down amplifier output unit is used for the testing result according to said low-frequency modulation signal detection module transmission, the luminous power output of step-down amplifier.
Said amplifier control module comprises the shutoff amplifier output stage, and said shutoff amplifier output stage is used for the testing result according to said low-frequency modulation signal detection module transmission, turn-offs the luminous power output of amplifier.
Adopt technology according to the invention to solve the laser safety problem in band Raman or the remote optical pumping amplifier.Because each all contains the low frequency id signal above optical channel, comprise that the channel that the OADM node is newly set out on a journey also contains the low frequency id signal, thereby avoid the key light channel not have the generation of sign situation, eliminated the disconnected possibility of erroneous judgement.The low frequency id signal increases and can backup each other simultaneously, has strengthened the reliability of laser radiation greatly.
Description of drawings
Fig. 1 is a prior art amplifier APR sketch map;
Fig. 2 is the amplifier APR sketch map of prior art band Raman;
Fig. 3 is the optical communication system that the present invention has the laser safeguard protection function;
Fig. 4 is the flow chart of the embodiment of the invention;
Fig. 5 is that low-frequency modulation signal loads sketch map;
Fig. 6 is that the low frequency id signal detects sketch map;
Fig. 7 is the structure chart of laser safeguard protection device in the optical communication system of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further, but not as to qualification of the present invention.
Embodiment
Because wdm system is incorporated in the multichannel wavelength optical signals in the optical fiber and transmits, so the luminous power in the wdm system can be bigger, the requirement of laser safety property is higher relatively.Referring to Fig. 3, the present invention proposes a kind of method, each road optical channel low frequency in the optical fiber is modulated by a small margin; Let each road optical channel signal all carry a kind of low frequency id signal, detecting wherein arbitrary low frequency id signal at downstream node is that decidable upstream fiber link is normal, otherwise thinks the upstream fiber link occurs fault; And then the luminous power of controlling this node is exported; Reach the purpose of laser safety, the concrete steps of its realization are following, referring to Fig. 4:
Step 101: when photo-emission source end node or OADM node traffic are set out on a journey; Each wavelength of optical signal of setting out on a journey is loaded low-frequency modulation signal; Make each road optical channel signal all carry a kind of low frequency id signal, the light signal of each optical channel closes the laggard optical channel of becoming owner of of ripple and transmits.The method that loads low-frequency modulation signal is:
Each road optical channel signal is all carried a kind of low frequency id signal and is realized through electric-controlled adjustable optical attenuator.As shown in Figure 5; The high speed business signal of telecommunication is loaded on the optical channel that wavelength is λ n through the electro-optical conversion unit; Optical channel λ n goes out the low frequency id signal through the electric-controlled adjustable optical attenuator cells modulate; Electric-controlled adjustable optical attenuator is by the low-frequency modulation signal unit controls, and the low-frequency modulation signal unit produces the modulation signal ω n of low frequency, for example selects the sinusoidal signal of single-frequency.Consider the influence of EDFA in the optical transmission system; The cycle of low-frequency modulation signal is preferably less than life-span of upper state particle; And easy to detect or input cost consideration for subsequent node; The frequency of low frequency id signal is unsuitable too high, is preferably in below the 1MHz, for example selects near the frequency of 100kHz～200kHz.Each optical channel can be selected different low frequency modulations frequencies, and for example each interval 100Hz between each low frequency modulations frequency can identify 1000 channels in 100kHz～200kHz frequency range, fully satisfies WDM and uses.For avoiding the low frequency id signal to influence the quality of optical channel service signal, the amplitude of low-frequency modulation signal need be controlled in the low-frequency modulation signal unit.Because excessive low frequency id signal can cause the macrorelief of crossing of optical passage signal luminous power, thereby causes the excessive OSNR of the blocked up initiation of optical channel service signal upper eyelid, the modulation depth of each optical channel id signal is between 3～5% generally speaking.In order to guarantee the stability of modulation depth, can also be used for FEEDBACK CONTROL low-frequency modulation signal unit at the integrated receiving system of light signal transmitting terminal, satisfying assurance modulation depth minimum under the prerequisite of testing conditions.In addition, the light signal transmitting terminal with a low frequency signal by a small margin directly the drive current of modulated laser can realize loading low-frequency modulation signal equally with the modulation Output optical power.
Step 102: the arbitrary node on the key light channel is received and is closed wave optical signal, carries out beam split and detects, and detects all low frequency id signals in the main optical signal; If arbitrary low frequency id signal exists; Then execution in step 105, if arbitrary low frequency id signal does not exist, then execution in step 103.The method that detects the low frequency id signal is:
As shown in Figure 6, spectrophotometric unit at first separates sub-fraction light from the key light channel, and for reducing the influence to business, general segregation ratio is less than 5%.The fraction light that separates gets into low speed light/electric converter unit and becomes the signal of telecommunication; This part function is realized by the PIN type photodiode or the avalanche photodide of low speed usually; Because low speed light/electric converter unit selects bandwidth to have only the device of MHz magnitude; And service signal at a high speed is generally all more than Gbit/s; Therefore the high speed business conversion of signals is a dc signal, and the modulation signal that has only low frequency is received by non-distortion, obtains confirming the whole low-frequency excitation signals in the bandwidth through tele-release big unit and electric bandpass filtering unit again.The signal of telecommunication of simulation becomes digital signal through A/D converter and sends into the processing unit analysis.Processing unit can be selected special-purpose digital signal processing chip or other CPU (Central Processing Unit-CPU); Utilize Fourier transform or other analytical method can the directly disposable information that obtains each low-frequency modulation signal, thereby judge the low-frequency modulation signal that whether has prior agreement in the key light channel.For guaranteeing can not produce misoperation; Should estimate fully that dynamic network exists under the OADM situation; Have sizable power difference between each light wavelength channel, thereby also there is sizable difference in the intensity of corresponding low-frequency modulation signal on each wavelength that receives, when processing unit numerical analysis low-frequency modulation signal; Should fully estimate the size of difference; Make checkout gear have enough wide detection range, have only the high power light channel perhaps to have only under low-power optical channel and the two mix in the optical transmission system, can correctly detect the existence of low frequency id signal to satisfy.
Step 103: arbitrary node judges that its upstream node breaks down to the optical fiber link of this node, starts APR or APSD laser radiation process, reduces or turn-offs that this node is equidirectional to be exported with the luminous power of amplifier in the other direction.
Step 104: the upstream node of arbitrary node and downstream node detect luminous power to be reduced or loses, and starts APR or APSD laser radiation process, reduce or turn-off separately node equidirectional with the luminous power output of amplifier in the other direction.
Step 105: arbitrary node judges that its upstream node does not break down to the optical fiber link of this node, and amplifier keeps normal output.
Referring to Fig. 7, the present invention also provides laser safeguard protection device in a kind of optical communication system, and device comprises the low-frequency modulation signal load-on module, closes the mode piece, spectral module, low-frequency modulation signal detection module and amplifier control module;
The low-frequency modulation signal load-on module is used for when photo-emission source end node or OADM node traffic are set out on a journey, each wavelength of optical signal of setting out on a journey being loaded low-frequency modulation signal;
Closing the mode piece is used for the light signal of each optical channel is closed ripple;
Spectral module is used for separating the sub-fraction light signal from the key light channel, as sensed light signal, and very little to the influence of the service signal on the key light channel;
The low-frequency modulation signal detection module is used for detecting the existence of closing the low frequency id signal that the arbitrary optical channel of wave optical signal carried, and testing result is sent to the amplifier control module;
The amplifier control module is used for the testing result according to the transmission of low-frequency modulation signal detection module, the luminous power output of control amplifier.
The low-frequency modulation signal load-on module comprises the low-frequency modulation signal generation unit, and the low-frequency modulation signal generation unit is used to generate low-frequency modulation signal.
The amplifier control module comprises the step-down amplifier output unit, and the step-down amplifier output unit is used for the testing result according to the transmission of low-frequency modulation signal detection module, the luminous power output of step-down amplifier.
The amplifier control module comprises the shutoff amplifier output stage, turn-offs amplifier output stage and is used for the testing result according to the transmission of low-frequency modulation signal detection module, turn-offs the luminous power output of amplifier.
Above-described embodiment is more preferably embodiment a kind of of the present invention, and common variation that those skilled in the art carries out in technical scheme scope of the present invention and replacement all should be included in protection scope of the present invention.
Claims (7)
1. laser security protection method in the optical communication system is characterized in that, said method comprising the steps of:
Steps A: when photo-emission source end node or OADM node traffic are set out on a journey; Each wavelength of optical signal of setting out on a journey is loaded low-frequency modulation signal; Make each road optical channel signal all carry a kind of low frequency id signal, the light signal of each optical channel closes the laggard optical channel of becoming owner of of ripple and transmits;
Step B: the arbitrary node on the key light channel is received and is closed wave optical signal; Carrying out beam split detects; Detect the existence of the low frequency id signal that arbitrary optical channel carried in the main optical signal; If arbitrary low frequency id signal exists, then arbitrary node judges that its upstream node does not break down to the optical fiber link of this node, and amplifier keeps normal output; If arbitrary low frequency id signal does not exist, then arbitrary node judges that its upstream node breaks down to the optical fiber link of this node, starts APR or APSD laser radiation process, reduces or turn-offs that this node is equidirectional to be exported with the luminous power of amplifier in the other direction;
Step C: the upstream and downstream node of said arbitrary node reduces or loses according to detecting luminous power, starts APR or APSD laser radiation process, reduce or turn-off separately node equidirectional with the luminous power output of amplifier in the other direction.
2. laser security protection method in the optical communication system as claimed in claim 1 is characterized in that the frequency of said low frequency id signal is less than 1MHz.
3. laser security protection method in the optical communication system as claimed in claim 1 is characterized in that, the modulation depth of said low frequency id signal is 3-5%.
4. laser safeguard protection device in the optical communication system is characterized in that, said device comprises the low-frequency modulation signal load-on module, closes the mode piece, spectral module, low-frequency modulation signal detection module and amplifier control module;
Said low-frequency modulation signal load-on module is used for when photo-emission source end node or OADM node traffic are set out on a journey, each wavelength of optical signal of setting out on a journey being loaded low-frequency modulation signal;
The said mode piece that closes is used for the light signal of each optical channel is closed ripple;
Said spectral module is used for separating the sub-fraction light signal from the key light channel, as sensed light signal, and very little to the influence of the service signal on the key light channel;
Said low-frequency modulation signal detection module is used for detecting the existence of closing the low frequency id signal that the arbitrary optical channel of wave optical signal carried, and testing result is sent to said amplifier control module;
Said amplifier control module is used for the testing result according to said low-frequency modulation signal detection module transmission, the luminous power output of control amplifier.
5. laser safeguard protection device in the optical communication system as claimed in claim 4 is characterized in that, said low-frequency modulation signal load-on module comprises the low-frequency modulation signal generation unit, and said low-frequency modulation signal generation unit is used to generate low-frequency modulation signal.
6. laser safeguard protection device in the optical communication system as claimed in claim 4; It is characterized in that; Said amplifier control module comprises the step-down amplifier output unit; Said step-down amplifier output unit is used for the testing result according to said low-frequency modulation signal detection module transmission, the luminous power output of step-down amplifier.
7. laser safeguard protection device in the optical communication system as claimed in claim 4; It is characterized in that; Said amplifier control module comprises the shutoff amplifier output stage; Said shutoff amplifier output stage is used for the testing result according to said low-frequency modulation signal detection module transmission, turn-offs the luminous power output of amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101896711A CN101453266B (en) | 2006-10-09 | 2006-10-09 | Laser security protection method and apparatus in optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101896711A CN101453266B (en) | 2006-10-09 | 2006-10-09 | Laser security protection method and apparatus in optical communication system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101404760A Division CN1949690B (en) | 2006-10-09 | 2006-10-09 | Method and apparatus of laser safety protection in optical communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101453266A CN101453266A (en) | 2009-06-10 |
| CN101453266B true CN101453266B (en) | 2012-01-04 |
Family
ID=40735314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101896711A Active CN101453266B (en) | 2006-10-09 | 2006-10-09 | Laser security protection method and apparatus in optical communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101453266B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995320B (en) | 2009-08-27 | 2012-03-21 | 华为海洋网络有限公司 | Method, device and equipment for detecting fault of underwater equipment |
| EP2579481B1 (en) | 2012-02-22 | 2017-08-23 | Huawei Technologies Co., Ltd. | Method, system and node device for monitoring performance of wavelength channel |
| CN104065412B (en) * | 2013-03-21 | 2017-05-31 | 中兴通讯股份有限公司 | The method and apparatus of optical network protection turning |
| CN104104428A (en) * | 2013-04-15 | 2014-10-15 | 昂纳信息技术（深圳）有限公司 | Laser safety protection device and method applied to distributed Raman fiber amplifier |
| EP3079275B1 (en) | 2013-12-31 | 2018-02-28 | Huawei Technologies Co., Ltd. | Broken fiber detection method, device and system for distributed raman optical amplifier |
| CN105320881B (en) * | 2014-06-30 | 2020-03-27 | 中兴通讯股份有限公司 | Optical power reduction protection method and device |
| CN104980225B (en) * | 2015-07-24 | 2017-10-03 | 武汉光迅科技股份有限公司 | A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) |
| CN113438015B (en) * | 2020-03-23 | 2022-06-10 | 武汉光迅科技股份有限公司 | APR protection method, device and computer storage medium |
| CN115567110B (en) * | 2022-12-05 | 2023-03-24 | 北京华环电子股份有限公司 | APR protection method, device, electronic equipment and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1451951A (en) * | 2002-04-08 | 2003-10-29 | 阿尔卡特公司 | System for measuring and controlling power loss of light transmission line, and related method |
| CN1738220A (en) * | 2004-08-17 | 2006-02-22 | 中兴通讯股份有限公司 | Method for realizing eyes protection in optical communication system |
-
2006
- 2006-10-09 CN CN2008101896711A patent/CN101453266B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1451951A (en) * | 2002-04-08 | 2003-10-29 | 阿尔卡特公司 | System for measuring and controlling power loss of light transmission line, and related method |
| CN1738220A (en) * | 2004-08-17 | 2006-02-22 | 中兴通讯股份有限公司 | Method for realizing eyes protection in optical communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101453266A (en) | 2009-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101453266B (en) | Laser security protection method and apparatus in optical communication system | |
| CN1874193B (en) | Method for implementing laser safeguard protection, and method for loading optical amplifier and id signal | |
| US6215565B1 (en) | Method of and system for diagnosing optical system failures | |
| US7920787B2 (en) | Method for detecting a check-back signal in an optical transmission system | |
| CN1852052B (en) | Optical-fiber line fault down stream alarm inhibiting method, apparatus and system | |
| CN102932056B (en) | The method and apparatus of a kind of sensed light signal performance and diagnosis optical fiber link failure | |
| US6891659B2 (en) | Optical amplifiers, optical fiber raman amplifiers and optical systems | |
| CN100479352C (en) | Optical associated signal loading, monitoring method and apparatus | |
| US8045851B2 (en) | Method and apparatus for automatic restoration detection and automatic restoration of optical communication system | |
| JPH11205243A (en) | Automatic power stop system for optical transmission line | |
| US7864389B2 (en) | Method of controlling optical amplifier located along an optical link | |
| CN1949690B (en) | Method and apparatus of laser safety protection in optical communication system | |
| CN103503337B (en) | A kind of communication equipment and method | |
| GB2421864A (en) | Restoring power in an optical fibre communication system using pilot signals | |
| US6814376B2 (en) | Method and system for generating short pulse signals | |
| CN112564790B (en) | Intelligent graphical management system for physical optical signal flow direction | |
| US9614613B2 (en) | Communication network element and method of mitigating an optical jamming attack against an optical communication system | |
| US10439711B2 (en) | Laser safety in data centers and other remote sites | |
| CN108234016A (en) | Optical network protection control method, device and NM server | |
| JPH11355216A (en) | Optical direct amplifier for wavelength division multiplexing system | |
| JP2000332329A (en) | Optical amplifier with optical output control function | |
| Chacinski et al. | Extension of 40 Gbps link with a directly detected 2.5 Gbps subcarrier channel |
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 |