CN101159506B - PON communication channel balancing method, device and system - Google Patents
PON communication channel balancing method, device and system Download PDFInfo
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- CN101159506B CN101159506B CN2007101240939A CN200710124093A CN101159506B CN 101159506 B CN101159506 B CN 101159506B CN 2007101240939 A CN2007101240939 A CN 2007101240939A CN 200710124093 A CN200710124093 A CN 200710124093A CN 101159506 B CN101159506 B CN 101159506B
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Abstract
The invention provides a PON communication channel equalization method, which comprises: detecting optical power of the channel; determining the equalization degree of the channel based on the detected optical power; judging whether the equalization degree reaches the preset threshold, if the equalization degree falls short of the preset threshold, adjusting the transmission power of each channel. The invention also provides a device and a system for communication channel equalization, which help to solve the problem of gain equalization of optical amplifiers and prolong the transmission distance of WDM-PON.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method of PON communication channel balancing, Apparatus and system.
Background technology
Along with developing rapidly of the communication technology, communication service increases rapidly, but comparatively speaking, has become slower as the growth of the speech business of comparative maturity, and the growth of data services but is very rapid.The business development of video traffic, particularly IPTV will make the communication flows sharp increase.Main video format mainly contains VCD, DivX, DVD, HDTV at present, and its flow of compression back is respectively 1.5Mb/s, 0.9Mb/s, 5Mb/s, 22.4Mb/s.And the ADSL technology can only provide 2～5Mb/s bandwidth, can not satisfy the needs of transmission HDTV, though the transmission rate of VDSL reaches as high as 100Mb/s, but because the defective that exists of VDSL itself, along with the increase of transmission range, because the attenuation ratio of transmission signals is very fast, its transmission rate descends very fast, when transmission range surpasses 1.5km, almost can not transmit.And XDSL earlier is connected to building or roadside through fiber optic network, then with the XDSL technology transfer to user side, final transmission speed and cost are somewhat dependent upon fiber optic network.
Along with the further evolution of " light advances copper and moves back ", EPON (PON) has become a kind of trend as Access Network, and EPON is divided into following several again: APON, EPON, BPON, GPON.These networks have all adopted beam splitter that luminous power is divided into several bundles, send corresponding user to.Owing to need all users to share upstream and downstream bandwidth, therefore these networks have some shortcomings clearly, number of users as each PON is few, this is because the power attenuation that beam splitter causes causes too greatly, again because the user need share bandwidth, therefore, user's raw tape is wide not high, simultaneously, because the user needs sharing wavelength, caused security performance poor.
A kind of new technology WDM-PON has caused people's extensive concern now, WDM-PON is that a kind of WDM technology of utilizing provides the technology of one road wavelength for each user, this is very different with traditional PON technology, does not need one road signal is shunted to 16 or 32 the tunnel.Because WDM-PON distributes a wavelength for each user, so it comes down to point-to-point communication, and is the structure of most economical point-to-multipoint on physical structure.Each user side (ONU or ONT) can be enjoyed a wavelength separately, thereby bandwidth can be guaranteed, and security performance is good.
Reduce requiring inevitable requirement WDM-PON to have longer transmission range (if can reach 100km or more than) and supporting more user (as more than 512) of operation maintenance cost and single-user equipment cost.Use high-output power to extend transmission distance, but single user cost will increase a lot.Under the prerequisite of not using the high-output power laser, increase transmission range, must adopt image intensifer.Because image intensifer has gain saturation, each ONU is because different apart from the distance of remote node, the power that enters image intensifer is unbalanced, high-power flashlight may make image intensifer enter saturation condition, make the little flashlight of power can not be amplified to the predetermined electric power value, this error rate that will cause the channel that the luminous power amplification is not enough increases.And the difference of online ONU quantity also can influence the gain of image intensifer.These problems all exist at metropolitan area network, wide area network, and at present in metropolitan area network and wide area network, these problems all are that the image intensifer with channel equalization function by costliness solves.
Because the cost sensitivity of Access Network, the image intensifer with channel equalization function of the costliness that employing is used on main line can improve user's cost greatly, thereby will hinder the expansion in its market.
Summary of the invention
Embodiments of the invention have proposed a kind of method, Apparatus and system of PON communication channel balancing, to solve the gain balance problem of WDM-PON light amplification, to prolong its transmission range.
Embodiments of the invention provide a kind of method that realizes channel equalization, may further comprise the steps:
Optical line terminal OLT detects the luminous power of up channel;
OLT counts the equilibrium degree of capable channel in according to the light power meter of the up channel that detects;
OLT judges whether the equilibrium degree of up channel reaches preset threshold, after the equilibrium degree of determining up channel does not reach preset threshold, calculates the regulated quantity of each optical network unit ONU channel emission power;
By signal frame or control frame to each ONU transmitting optical power regulating command, described optical power adjustment instruction carries the regulated quantity information of ONU channel emission power, uplink channel transmission power is regulated according to the regulated quantity information of described transmitting power to control described ONU.
The present invention also provides a kind of optical line terminal, wherein:
Light receiving unit be used for the up luminous power information that will receive, and the descending luminous power information that reports sends processing unit to;
Processing unit, be used for channel is detected, judge according to the luminous power that light receiving unit sends whether the equilibrium value of channel power reaches preset threshold, if do not reach setting threshold, then to ONU and/or OLT transmission regulating command channel emission power is regulated, wherein said optical power adjustment instruction carries the regulated quantity information of transmitting power;
Optical Transmit Unit is used to receive the regulating command of processing unit, the down channel transmitting power is regulated the regulating command that sends to ONU with forward processing unit according to regulating command;
Wherein, described processing unit comprises:
Judging unit is used to detect the luminous power of channel, determines the equilibrium degree of channel according to luminous power, judges whether the equilibrium degree of channel reaches preset threshold;
Arithmetic element is used for when the equilibrium degree of channel does not reach preset threshold, calculates the regulated quantity of the transmitting power of ONU and/or OLT;
Control unit, the regulated quantity that is used for the transmitting power of the ONU that calculates according to arithmetic element and/or OLT is regulated to reach channel equalization the channel transmitting power of ONU and/or OLT respectively, wherein, when up channel was unbalanced, described control unit sends regulating command by described Optical Transmit Unit to ONU made described ONU regulate transmission power level to reach channel equalization; When descending channel was unbalanced, described control unit transmitted power control commands to described Optical Transmit Unit, controlled described Optical Transmit Unit and regulated down transmitting power to reach channel equalization according to regulating command.
The embodiment of the invention has also proposed a kind of EPON, and it comprises optical network unit ONU and optical line terminal OLT as previously discussed; Wherein:
Optical line terminal is used for channel is detected, and judges according to the luminous power of receiving whether the equilibrium degree of channel reaches preset threshold, when not reaching setting threshold, channel power is regulated to trigger to ONU and/or OLT transmission regulating command;
Optical network unit is used for according to the ascending power regulating command that receives, and the Optical Transmit Unit of control ONU is regulated its transmitting power, also is used for the detected descending luminous power information of ONU is sent to OLT.
The beneficial effect of the embodiment of the invention is as follows:
On common WDM-PON hardware system, use the image intensifer of common no equalization function, between OLT and ONU, realized channel equalization, prolong its transmission range with lower cost, and guaranteed the communication quality of each channel.Realize simply not increasing the complexity of system equipment.
Description of drawings
Fig. 1 is the flow chart that OLT of the present invention detects the power equalization degree of up channel;
Fig. 2 is the flow chart that ONU of the present invention detects the power equalization degree of down channel;
Fig. 3 is an optical line terminal of the present invention;
Fig. 4 is an optical network unit of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is done description further.
Because Access Network is extremely responsive to cost in the face of the terminal use, can not adopt the expensive image intensifer with channel equalization function.The present invention is directed to this problem, proposed a kind of simple, effective, economic solution, Apparatus and system, to realize the PON communication channel balancing.
Under the prerequisite of not using the high-output power laser, increase transmission range, need to adopt image intensifer, it is low that the luminous power that enters the different channels of image intensifer has height to have, usually, the high channel of power is with absorbing light amplifier more power, and what power was low can not fully be amplified.So the transmitting power of passage that need power is too high is turned down, the transmitting power low excessively power increases, and just can realize the channel power equilibrium by progressively regulating.The present invention is by carrying out optical power monitoring and realizing the equilibrium of uplink and downlink channel power by the message interaction between OLT and the ONU in OLT and ONU.Wherein, for sake of convenience, ONU is the general designation of ONT and ONU among the present invention.
Embodiment one, and as shown in Figure 1, in the present embodiment, OLT detects up each channel light power, comes the balanced intensity of rated output then according to the luminous power that detects:
If channel power equilibrium degree (balanced intensity of channel power) meets the demands, continue the supervisory channel luminous power so, it is the power equalization degree that system continues to monitor up channel, when in case the equilibrium degree of up channel can not meet the demands, when promptly not reaching preset threshold, system reacts at once, calculates the regulated quantity of the transmitting power of each ONU, OLT transmits power control commands to ONU then, and regulated quantity is sent to ONU by signal frame or control frame.In a single day ONU receives signal frame or the control frame that has the power adjustments amount, does corresponding power adjustments at once, regulates the power of reflector, after power adjustments is finished, ONU will finish message feedback by signal frame or control frame and give OLT, and then, OLT continues the monitoring and controlling channels equilibrium situation.
Different with embodiment one is, is to adopt ONU to detect the luminous power of down channel among the embodiment two, and as shown in Figure 2, ONU detects the descending luminous power that arrives receiver, then this luminous power information is sent to OLT by signal frame or control frame.OLT collects the luminous power information that all ONU send over, and calculates the power equalization degree of each down channel.If the power equalization degree meets the requirements, the transmitting power of each down channel remains unchanged so.If the power equalization degree is undesirable, calculates the transmission power adjustment value of the optical transmitting set of each down channel of OLT so, and control each optical transmitting set and regulate transmitting power.After finishing, adjusting continues to monitor the power equalization of down channel by each downlink channel power value of ONU feedback.
In embodiment one and embodiment two, after adjusting, all to continue the luminous power of channel is detected, whether the equilibrium degree of judging channel has once more reached preset threshold, be whether channel is balanced, balanced if channel does not also reach, then proceed next step flow process, promptly proceed to detect, up to the equilibrium that reaches channel.
As shown in Figure 3, a kind of optical line terminal, comprising processing unit, light receiving unit, Optical Transmit Unit.Light receiving unit is with its up luminous power that receives, and the descending luminous power that ONU reports sends processing unit to, processing unit can be used for communication channel is detected, when the equilibrium value of up channel power does not reach setting threshold, send each ONU of instruction indication and regulate its transmitting power.Processing unit comprises again: judging unit, arithmetic element, control unit.Wherein, judging unit receives the up luminous power that light receiving unit receives from each light receiving unit on the one hand, determine the equilibrium degree of up channel, and whether the equilibrium degree of judging up channel reaches preset threshold, on the other hand, receive the descending luminous power that ONU reports from each light receiving unit, determine the equilibrium degree of down going channel, and judge whether the equilibrium degree of down going channel reaches the threshold values of setting; According to judged result, whether judging unit indication arithmetic element carries out the calculating of transmission power adjustment amount; Arithmetic element when the equilibrium degree of up channel and down channel does not reach preset threshold, calculates the regulated quantity of transmitting power of the Optical Transmit Unit of each ONU or OLT, and the regulated quantity of gained is the foundation that transmitting power is regulated; Control unit is according to from the transmission power adjustment amount of arithmetic element two kinds of possible processing being arranged: when up channel was unbalanced, then the Optical Transmit Unit by OLT sent regulating command (signal frame or control frame) to ONU and makes ONU regulate transmission power level to reach channel equalization; When descending channel was unbalanced, then the Optical Transmit Unit to OLT transmitted power control commands, and the Optical Transmit Unit of OLT is regulated down transmitting power to reach channel equalization according to regulating command.Include regulated quantity in the regulating command.
After regulating for the first time, continue the channel equalization degree of monitoring up-downgoing, judge once more whether the equilibrium degree of channel has reached preset threshold, be whether channel is balanced, balanced if channel does not also reach, then proceed next step flow process, promptly continue to regulate and monitoring, up to reaching channel equalization.
As shown in Figure 4, a kind of optical network unit, comprise that resolution unit, ascending power adjustment unit and descending luminous power report the unit, resolution unit is used for receiving ascending power adjustment indication and descending luminous power from light receiving unit, shunt processing then, ascending power adjustment indication shunting handles for the ascending power adjustment unit, and descending luminous power is shunted to descending luminous power and reported cell processing.The ascending power adjustment unit goes to regulate the transmitting power of ONU to reach channel equalization according to the power adjustments indication control Optical Transmit Unit from OLT.Whether balanced descending luminous power reports the unit that the detected descending luminous power of light receiving unit is packaged into message and sends it back OLT by Optical Transmit Unit, as the processor of OLT judgement down channel data.Optical Transmit Unit is adjusted transmitting power according to the power adjustment indication that the ascending power adjustment unit sends simultaneously.
Obviously, those skilled in the art can carry out various changes and modification to embodiments of the invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. the method for a PON communication channel balancing is characterized in that, comprising:
Optical line terminal OLT detects the luminous power of up channel;
OLT counts the equilibrium degree of capable channel in according to the light power meter of the up channel that detects;
OLT judges whether the equilibrium degree of up channel reaches preset threshold, after the equilibrium degree of determining up channel does not reach preset threshold, calculates the regulated quantity of each optical network unit ONU channel emission power;
OLT by signal frame or control frame to each ONU transmitting optical power regulating command, described optical power adjustment instruction carries the regulated quantity information of ONU channel emission power, uplink channel transmission power is regulated according to the regulated quantity information of described transmitting power to control described ONU.
2. method according to claim 1 is characterized in that, further comprises:
If the equilibrium degree of channel reaches preset threshold, then detect the luminous power of channel again.
3. method according to claim 1 is characterized in that, further comprises:
Each ONU receives described optical power adjustment instruction from OLT, according to the regulated quantity information of the transmitting power in the described instruction uplink channel transmission power is regulated.
4. method according to claim 3 is characterized in that, further comprises:
After ONU regulates light emitting power, send feedback information to OLT, OLT continues to detect the luminous power of up channel.
5. an optical line terminal is characterized in that, comprising:
Light receiving unit be used for the up luminous power information that will receive, and the descending luminous power information that reports sends processing unit to;
Processing unit, be used for channel is detected, judge according to the luminous power that light receiving unit sends whether the equilibrium value of channel power reaches preset threshold, if do not reach setting threshold, then to ONU and/or OLT transmission regulating command channel emission power is regulated, wherein said optical power adjustment instruction carries the regulated quantity information of transmitting power;
Optical Transmit Unit is used to receive the regulating command of processing unit, the down channel transmitting power is regulated the regulating command that sends to ONU with forward processing unit according to regulating command;
Wherein, described processing unit comprises:
Judging unit is used to detect the luminous power of channel, determines the equilibrium degree of channel according to luminous power, judges whether the equilibrium degree of channel reaches preset threshold;
Arithmetic element is used for when the equilibrium degree of channel does not reach preset threshold, calculates the regulated quantity of the transmitting power of ONU and/or OLT;
Control unit, the regulated quantity that is used for the transmitting power of the ONU that calculates according to arithmetic element and/or OLT is regulated to reach channel equalization the channel transmitting power of ONU and/or OLT respectively, wherein, when up channel was unbalanced, described control unit sends regulating command by described Optical Transmit Unit to ONU made described ONU regulate transmission power level to reach channel equalization; When descending channel was unbalanced, described control unit transmitted power control commands to described Optical Transmit Unit, controlled described Optical Transmit Unit and regulated down transmitting power to reach channel equalization according to regulating command.
6. a passive optical network is characterized in that, comprising: optical network unit ONU and optical line terminal OLT as claimed in claim 5; Wherein, described OLT is used for channel is detected, and judges according to the luminous power of receiving whether the equilibrium degree of channel reaches preset threshold, when not reaching setting threshold, channel power is regulated to trigger to ONU and/or OLT transmission regulating command;
Described ONU is used for according to the ascending power regulating command that receives, and the Optical Transmit Unit of control ONU is regulated its transmitting power, also is used for the detected descending luminous power information of ONU is sent to OLT.
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| CN2007101240939A CN101159506B (en) | 2007-10-26 | 2007-10-26 | PON communication channel balancing method, device and system |
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| CN2007101240939A CN101159506B (en) | 2007-10-26 | 2007-10-26 | PON communication channel balancing method, device and system |
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| CN101159506B true CN101159506B (en) | 2011-05-04 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101841373B (en) * | 2009-03-19 | 2013-04-24 | 华为技术有限公司 | Method and device for regulating optical power |
| WO2012163052A1 (en) * | 2011-11-15 | 2012-12-06 | 华为技术有限公司 | Method and apparatus for equalizing channel of passive optical network |
| ES2623913T3 (en) | 2011-12-28 | 2017-07-12 | Huawei Technologies Co., Ltd. | Method and equipment to balance the functioning of links |
| CN103517162B (en) * | 2013-09-13 | 2017-02-15 | 南方电网科学研究院有限责任公司 | Communication system and method based on XPON |
| CN104683022B (en) * | 2013-12-02 | 2018-02-23 | 中国移动通信集团公司 | Transmitting optical power adjusting adjusting method and optical line terminal, system in EPON |
| CN104779994B (en) * | 2014-01-10 | 2018-11-23 | 深圳市双翼科技有限公司 | The guard method of ethernet passive optical network and device |
| CN106160869A (en) * | 2015-04-08 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of optical network system, cold joint optical fiber attenuation union joint device and method |
| CN106550290B (en) * | 2015-09-21 | 2020-10-02 | 南京中兴软件有限责任公司 | Passive optical network power balancing method, device, terminal, unit and system |
| CN106936510B (en) * | 2015-12-30 | 2020-10-09 | 华为技术有限公司 | Method for adjusting optical power, network equipment and network management equipment |
| CN107666354B (en) * | 2016-07-27 | 2020-02-14 | 中国电信股份有限公司 | Power control method and system, optical line terminal and optical network unit |
| CN106992812A (en) * | 2017-05-25 | 2017-07-28 | 成都优博创通信技术股份有限公司 | A kind of unglazed monitoring method, optical module and controller |
| CN108174313B (en) * | 2017-12-28 | 2020-05-08 | 宏安集团有限公司 | EPON expansion system |
| US20240106534A1 (en) * | 2022-09-23 | 2024-03-28 | Huawei Technologies Canada Co., Ltd. | Method and system for improving performance in an optical link |
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