CN101621332A - Method and device for detecting optical power of optical network unit on line - Google Patents
Method and device for detecting optical power of optical network unit on line Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting optical power of an optical network unit on line. The device for detecting optical power of an optical network unit on line comprises an optical line terminal media accessing control layer OLT MAC control module, an optical line terminal OLT side light module and an analog-to-digital AD conversion circuit module, wherein the OLT side light module is used for outputting a voltage signal when receiving an optical signal of an optical network unit ONU, the OLT MAC control module can lead an analog-to-digital AD conversion circuit to sample the voltage signal output by the OLT side light module, and the OLTMAC control module is used for reading a numerical value obtained by analog-to-digital conversion and converting the numerical value into an optical power value to obtain the optical power of the ONU. The method and the device for detecting optical power of an optical network unit on line can detect the optical power of each ONU in an EPON system, realize online detection in a communication process and can not influence the communication between the OLT and the ONU in a detecting process.
Description
Technical field
The present invention relates to the optical communication technology field, relate in particular to a kind of method and apparatus of online detection optical network unit (ONU) optical power.
Background technology
EPON (Ethernet Passive Optical Networks, EPON based on Ethernet) single-point of system only is to use passive optical splitter to the framework of multiple spot, without any need for active equipment, greatly reduce network installation, administer and maintain cost, (FTTH: Fiber to the home so EPON is at FTTX, FTTB: Fiber-To-The-Building, FTTP: application FTTP) more and more widely.But because in the EPON system, uplink optical signal (wavelength 1310nm) is a burst mode, be different from normal continuous light signal, traditional method of testing is an average light power in the test sample cycle, traditional luminous power method of testing like this can not obtain certain ONU (Optical Network Unit, optical network unit) correct luminous power, this brings very big difficulty for maintenance of network.
EPON system reference structure such as Fig. 1, OLT (Optical Line Terminal by office's side, optical line terminal), the ONU of user side (Optical Network Unit, optical network unit) and Optical Distribution Network ODN (Optical Distribution Network) form, be the single fiber bi-directional system.At down direction (OLT is to ONU), the signal that OLT sends arrives each ONU by ODN.At up direction (ONU is to OLT), the signal that ONU sends only can arrive OLT, and can not arrive other ONU.
For fear of data collision and improve network utilisation efficient, up direction adopts time division multiple access TDMA (Time Division Multiple Access) access way and the data of each ONU is sent and arbitrates.ODN is made up of Passive Optical Components such as optical fiber and one or more passive optical splitters, provides optical channel between OLT and ONU.This time division multiple access TDMA mode makes certain ONU to send light signal in the time slot of regulation, and next time slot is exactly that another ONU sends light signal.
Optical module test light power is the average light power in the sampling period at present, factors such as the used optical module model of ONU and optical path distance cause each ONU luminous power may be different, so average light power can not reflect each ONU actual light power, this brings very big difficulty for the diagnosis and the maintenance of network.Illustrate just in more existing patent documentations that certain ONU luminous power detects, and does not illustrate online detection to each ONU luminous power under the OLT system.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method and apparatus of online detection optical network unit (ONU) optical power is provided, be used for realizing that the OLT of EPON system side is online to each ONU luminous power detection, the luminous power of each ONU detects in being particularly useful for realizing system under the situation of proper communication.
In order to address the above problem, the present invention proposes a kind of device of online detection optical network unit (ONU) optical power, comprising: optical line terminal media access control layer OLT MAC control module, optical line terminal OLT sidelight module, modulus A/D convertor circuit module, wherein:
Described OLT MAC control module directly is connected with OLT sidelight module on the one hand, on the other hand, connects in succession by described A/D convertor circuit module and OLT sidelight intermodule;
Described OLT sidelight module is used for output voltage signal when receiving the light signal of optical network unit ONU, and described OLT MAC control module enables the modulus A/D convertor circuit voltage signal of OLT sidelight module output is sampled; Described OLT MAC control module reads the numerical value that analog-to-digital conversion obtains, and converts optical power value to, obtains the luminous power of described ONU.
Further, the interface between described OLT MAC control module and the described A/D convertor circuit module is a serial data bus interface; Described OLT sidelight module arrives described A/D convertor circuit module by a pin output aanalogvoltage on it.
Further, described OLT MAC control module and the direct-connected interface of OLT sidelight module are the SerDes interface.
Further, described OLT sidelight inside modules is integrated with photo-detector, preamplifier, signal transformation circuit, wherein:
Photo-detector is used for surveying receiving optical signals from optical fiber link, and light signal is converted to photo-signal exports preamplifier to;
Preamplifier is used for converting the photo-signal that photo-detector produces to analog voltage signal and exports signal transformation circuit to;
Signal transformation circuit is used for this analog voltage signal is carried out shaping filter, and this analog voltage signal behind the removal clutter is exported to the A/D convertor circuit module from one of them pin of OLT sidelight module.
Further, described OLT sidelight module is if adopt little encapsulation hot plug SFP packaged type, then its pinout meets the multi-source agreement MSA standard of little encapsulation hot plug SFP, utilizes No. 7 pins to export described A/D convertor circuit module to as analog voltage output signal.
Further, the sampling time Tc of described A/D convertor circuit module is less than the minimum time slot Tonu that optical network unit ONU is assigned to and deducts the poor of loop time delay RTT, i.e. Tc＜Tonu-RTT.
The present invention also provides a kind of method of online detection optical network unit (ONU) optical power, comprises the steps:
A, optical line terminal OLT are distributed common GATE message for the optical network unit ONU of registration;
B, in the time slot that described common GATE message is authorized, optical line terminal OLT is received succeeding in registration when replying of described ONU, enables the modulus A/D convertor circuit voltage signal of optical line terminal OLT sidelight module output is sampled;
C, if the succeeding in registration to reply and finish analog-to-digital conversion when not finishing of described ONU feedback, then described OLT MAC control module reads the numerical value that analog-to-digital conversion obtains, and converts optical power value to, obtains the luminous power of described ONU.
Further, described method further comprises:
D, repeating step A, B, C carry out online luminous power to the described optical network unit ONU of the next one and detect, and finish online luminous power until all optical network unit ONU and detect.
Further, described steps A specifically comprises:
Optical line terminal OLT is initiated one and is taken turns discovery GATE, distributes one to find window, and GATE message is found in unregistered optical network unit ONU response, and the local clock label is set;
ONU sends login request message REGISTER_REQ after waiting for a random delay;
After OLT confirms login request message REGISTER_REQ, for ONU distributes a unique LLID LLID;
OLT sends a common GATE message to ONU;
In the time slot that ONU is authorized in the common GATE message that receives, send to succeed in registration to OLT and reply REGISTER_ACK message.
Common GATE message when further, the common GATE message described in the described steps A is common GATE message in the registration process or follow-up normal communication.
Further, described step C further comprises:
If when finishing analog-to-digital conversion, the succeeding in registration to reply of described ONU feedback finished, and then described ONU waits for the next time slot among the common GATE, the feedback response message that succeeds in registration again in next time slot, re-execute step B and step C, until the online optical power value that obtains this ONU.
The method and apparatus of online detection optical network unit (ONU) optical power of the present invention, the luminous power of each ONU detects in can realizing system under the situation of EPON system proper communication, be convenient to the diagnosis of EPON grid and safeguard that saving system maintenance cost improves system reliability.Compared with prior art, not only can the luminous power of each ONU in the EPON system be detected, and owing to increased A/D convertor circuit, can come to determine accuracy of detection as required, can select the high transducer of AD conversion accuracy for use for the demanding situation of accuracy of detection, can select for use conversion accuracy to hang down relatively cheap AD converter for the not high situation of accuracy of detection.Owing to realized the online detection in communication process, thereby the present invention does not influence the communication between OLT and the ONU.
Description of drawings
Fig. 1 is an EPON system reference structure of the present invention;
Fig. 2 is the circuit block diagram of online detection optical network unit (ONU) optical power device in the embodiment of the invention;
Fig. 3 is the structure chart of OLT sidelight module in the online detection optical network unit (ONU) optical power device;
Fig. 4 is a luminous power detection procedure of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The apparatus and method of online detection optical network unit (ONU) optical power of the present invention, the luminous power detection technique that relates to EPON system optical module, be used for side OLT (Optical LineTerminal in office of EPON system, optical line terminal) each user side of the online detection of equipment ONU (Optical Network Unit, optical network unit) equipment luminous power, the OLT side is online under the situation of EPON system proper communication detects each ONU luminous power, be convenient to diagnosis of EPON grid and maintenance, save the system maintenance cost, improve system reliability.
As shown in Figure 2, the structural representation that has shown the device of online detection optical network unit (ONU) optical power of the present invention.The device of this online detection optical network unit (ONU) optical power comprises: OLT MAC control module, OLT sidelight module and A/D convertor circuit module.Wherein: OLT MAC control module directly is connected with OLT sidelight module by the SerDes interface on the one hand, on the other hand, connects in succession by an A/D convertor circuit module and OLT sidelight intermodule.
Described OLT sidelight module be used for OLT MAC control module normal communication outside, output voltage signal when receiving the light signal of optical network unit ONU, described OLT MAC control module enable the modulus A/D convertor circuit voltage signal of OLT sidelight module output are sampled; Described OLTMAC control module reads the numerical value that analog-to-digital conversion obtains, and converts optical power value to, obtains the luminous power of described ONU.Wherein, as long as the OLT optical module receives light signal, will output voltage signal, the OLTMAC control module is controlled the sample time point (in distributing to the time slot of this ONU) of this voltage signal of described A/D convertor circuit.
A pin output aanalogvoltage of OLT sidelight module is to the A/D convertor circuit module, interface between A/D convertor circuit module and the OLT MAC control module can use the serial data bus interface mode, can simplify the mode of connection between OLT MAC control module and the A/D convertor circuit module like this, but be not limited to the serial data bus interface mode.
Have only OLT MAC control module and OLT sidelight module in common EPON system, the device of online detection optical network unit (ONU) optical power shown in Figure 2 increases an A/D convertor circuit module between OLT MAC control module and OLT sidelight module.OLT sidelight module can define an idle pin in the existing module, and the pin of this redetermination is used to export aanalogvoltage to the A/D convertor circuit module.For OLT sidelight module, also can adopt other function pin to carry out compound definition, as the pin that is used to export aanalogvoltage.
As shown in Figure 3, shown the internal structure schematic diagram of OLT sidelight module shown in Figure 2, this OLT sidelight inside modules is integrated with photo-detector, preamplifier, signal transformation circuit.Wherein:
Photo-detector is used for surveying receiving optical signals from optical fiber link, and light signal is converted to photo-signal exports preamplifier to;
Preamplifier is used for converting the photo-signal that photo-detector produces to analog voltage signal and exports signal transformation circuit to;
Signal transformation circuit is used for this analog voltage signal is carried out shaping filter, and this analog voltage signal behind the removal clutter is exported to the A/D convertor circuit module from a pin of OLT sidelight module.
For SFP (Small Form-Factor Pluggable, little encapsulation hot plug) Feng Zhuan OLT sidelight module, its pinout meets SFP MSA (Multi Source Agreement, multi-source agreement) standard, can utilize the original No. 7 idle pins of OLT sidelight module to redefine, pin as analog voltage output signal, support so online detection ONU luminous power the SFP encapsulation OLT sidelight module and not support the SFP of online detection ONU luminous power to encapsulate OLT sidelight module be compatible, during actual the use, can select OLT sidelight module flexibly and not needs change design according to application demand.Certainly, also can adopt other function pin, carry out compound definition and make it also have the function of output analog voltage signal simultaneously concurrently to described A/D convertor circuit.
TDMA mode between OLT and the ONU is arbitrated by OLT, finishes the detection of luminous power in the time window that OLT distributes to ONU, surpasses this time window, and the voltage signal of OLT sidelight module output is with inaccurate.In addition, because the existence of loop time delay RTT (Round Trip Time), so the sampling time Tc of A/D convertor circuit module is less than the minimum time slot Tonu that ONU is assigned to and deducts the poor of RTT, be Tc＜Tonu-RTT, could guarantee before ONU sends signal ended, correctly to finish luminous power like this and detect.The loop time delay RTT of ONU OLT when ONU registers can determine by MPCP (Multi-Point Control Protocol, Multi-point Control Protocol) agreement.
Fig. 4 has provided the schematic flow sheet of the method for online detection optical network unit (ONU) optical power of the present invention.Below in conjunction with Fig. 4 handling process of the present invention and step are described.
Step 401:OLT initiates one and takes turns discovery GATE (discovery GATE) message, distributes one to find window, and GATE message is found in unregistered ONU response, and the local clock label is set;
Step 402:ONU sends register requirement REGISTER_REQ message after waiting for a random delay;
After step 403:OLT acknowledged receipt of this register requirement REGISTER_REQ message, OLT distributed a unique LLID LLID (Logical Link ID) to ONU;
Step 404:OLT sends a common GATE (GATE) and gives ONU;
After step 405:ONU receives this common GATE message, send a registration reply REGISTER_ACK message again and inform OLT successfully registration, transmit in the time slot that this registration reply REGISTER_ACK message is authorized in the common GATE message that receives;
So far, through 401～405 steps, the ONU registration is finished, and the ONU luminous power detects and can finish in the time slot that this common GATE message is authorized, and also can finish in the time slot that the common GATE message of follow-up normal communication is authorized.
Step 406:OLT receives the REGISTER_ACK that replys of common GATE message that ONU beams back;
Step 407:OLT enables AD converter, and AD converter is started working;
Step 408: the wait AD converter is finished the voltage signal sampling to the output of OLT optical module;
After step 409:AD converted, OLT MAC control module judged whether the answer signal that ONU beams back does not also finish, and if not, does not promptly finish as yet, then goes to step 410, if, promptly finish, then go to step 411;
Step 410:OLT MAC reads the AD transforming numerical, converts optical power value to, and the ONU luminous power of this LLID just detects and finishes.
Step 411: if finish, then current AD transformation result is invalid;
Step 412: wait for that OLT distributes to the next time slot of this LLID ONU, detects this ONU luminous power again from step 404 beginning.
The luminous power that above step has just been finished an ONU detects, and then repeats above step and gets final product if detect other ONU.
Because luminous power detects and finishes in common GATE time slot,, any one common GATE time slot of ONU registration back detects so can carrying out luminous power.The ONU luminous power detects and finishes when EPON system normal communication, realizes online detection, does not influence communication.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (11)
1, a kind of device of online detection optical network unit (ONU) optical power is characterized in that, comprising: optical line terminal media access control layer OLT MAC control module, and optical line terminal OLT sidelight module, modulus A/D convertor circuit module, wherein:
Described OLT MAC control module directly is connected with OLT sidelight module on the one hand, on the other hand, connects in succession by described A/D convertor circuit module and OLT sidelight intermodule;
Described OLT sidelight module is used for output voltage signal when receiving the light signal of optical network unit ONU, and described OLT MAC control module enables the modulus A/D convertor circuit voltage signal of OLT sidelight module output is sampled; Described OLT MAC control module reads the numerical value that analog-to-digital conversion obtains, and converts optical power value to, obtains the luminous power of described ONU.
2, device as claimed in claim 1 is characterized in that,
Interface between described OLT MAC control module and the described A/D convertor circuit module is a serial data bus interface;
Described OLT sidelight module arrives described A/D convertor circuit module by a pin output aanalogvoltage on it.
3, device as claimed in claim 1 is characterized in that,
Described OLT MAC control module and the direct-connected interface of OLT sidelight module are the SerDes interface.
4, device as claimed in claim 1 is characterized in that, described OLT sidelight inside modules is integrated with photo-detector, preamplifier, signal transformation circuit, wherein:
Photo-detector is used for surveying receiving optical signals from optical fiber link, and light signal is converted to photo-signal exports preamplifier to;
Preamplifier is used for converting the photo-signal that photo-detector produces to analog voltage signal and exports signal transformation circuit to;
Signal transformation circuit is used for this analog voltage signal is carried out shaping filter, and this analog voltage signal behind the removal clutter is exported to the A/D convertor circuit module from one of them pin of OLT sidelight module.
5, as claim 2 or 4 described devices, it is characterized in that,
Described OLT sidelight module is if adopt little encapsulation hot plug SFP packaged type, and then its pinout meets the multi-source agreement MSA standard of little encapsulation hot plug SFP, utilizes No. 7 pins to export described A/D convertor circuit module to as analog voltage output signal.
6, device as claimed in claim 1 is characterized in that,
The sampling time Tc of described A/D convertor circuit module is less than the minimum time slot Tonu that optical network unit ONU is assigned to and deducts the poor of loop time delay RTT, i.e. Tc＜Tonu-RTT.
7, a kind of method of online detection optical network unit (ONU) optical power is characterized in that, comprises the steps:
A, optical line terminal OLT are distributed common GATE message for the optical network unit ONU of registration;
B, in the time slot that described common GATE message is authorized, optical line terminal OLT is received succeeding in registration when replying of described ONU, enables the modulus A/D convertor circuit voltage signal of optical line terminal OLT sidelight module output is sampled;
C, if the succeeding in registration to reply and finish analog-to-digital conversion when not finishing of described ONU feedback, then described OLT MAC control module reads the numerical value that analog-to-digital conversion obtains, and converts optical power value to, obtains the luminous power of described ONU.
8, method as claimed in claim 7 is characterized in that, described method further comprises:
D, repeating step A, B, C carry out online luminous power to the described optical network unit ONU of the next one and detect, and finish online luminous power until all optical network unit ONU and detect.
9, method as claimed in claim 7 is characterized in that, described steps A specifically comprises:
Optical line terminal OLT is initiated one and is taken turns discovery GATE, distributes one to find window, and GATE message is found in unregistered optical network unit ONU response, and the local clock label is set;
ONU sends login request message REGISTER_REQ after waiting for a random delay;
After OLT confirms login request message REGISTER_REQ, for ONU distributes a unique LLID LLID;
OLT sends a common GATE message to ONU;
In the time slot that ONU is authorized in the common GATE message that receives, send to succeed in registration to OLT and reply REGISTER_ACK message.
10, as claim 7 or 9 described methods, it is characterized in that the common GATE message when the common GATE message described in the described steps A is common GATE message in the registration process or follow-up normal communication.
11, as claim 7 or 9 described methods, it is characterized in that described step C further comprises:
If when finishing analog-to-digital conversion, the succeeding in registration to reply of described ONU feedback finished, and then described ONU waits for the next time slot among the common GATE, the feedback response message that succeeds in registration again in next time slot, re-execute step B and step C, until the online optical power value that obtains this ONU.
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| CN200910150128A CN101621332A (en) | 2009-07-07 | 2009-07-07 | Method and device for detecting optical power of optical network unit on line |
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| CN101945310A (en) * | 2010-09-16 | 2011-01-12 | 中兴通讯股份有限公司 | Method for reporting capacity of ONU port in real time and ONU |
| WO2011079656A1 (en) * | 2009-12-30 | 2011-07-07 | 中兴通讯股份有限公司 | Device and method for obtaining optical power of optical network unit (onu) in online manner |
| WO2011116560A1 (en) * | 2010-03-23 | 2011-09-29 | 中兴通讯股份有限公司 | Method and equipment for measuring reception optical power of optical network unit |
| CN102324969A (en) * | 2011-07-18 | 2012-01-18 | 国电南京自动化股份有限公司 | Receiving end light power on-line detection device and implementation method thereof |
| CN103634054A (en) * | 2012-08-23 | 2014-03-12 | 北京邮电大学 | Linear damage compensation and polarization de-multiplexing method for high-speed coherent receiving system |
| CN103731215A (en) * | 2013-11-15 | 2014-04-16 | 成都市宏山科技有限公司 | Optical line terminal with two-stage temperature monitoring |
| CN104579490A (en) * | 2014-12-12 | 2015-04-29 | 武汉电信器件有限公司 | Highly integrated OLT optical module |
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| WO2011079656A1 (en) * | 2009-12-30 | 2011-07-07 | 中兴通讯股份有限公司 | Device and method for obtaining optical power of optical network unit (onu) in online manner |
| WO2011116560A1 (en) * | 2010-03-23 | 2011-09-29 | 中兴通讯股份有限公司 | Method and equipment for measuring reception optical power of optical network unit |
| CN101945310A (en) * | 2010-09-16 | 2011-01-12 | 中兴通讯股份有限公司 | Method for reporting capacity of ONU port in real time and ONU |
| CN102324969B (en) * | 2011-07-18 | 2015-02-18 | 国电南京自动化股份有限公司 | Receiving end light power on-line detection device and implementation method thereof |
| CN102324969A (en) * | 2011-07-18 | 2012-01-18 | 国电南京自动化股份有限公司 | Receiving end light power on-line detection device and implementation method thereof |
| CN103634054A (en) * | 2012-08-23 | 2014-03-12 | 北京邮电大学 | Linear damage compensation and polarization de-multiplexing method for high-speed coherent receiving system |
| CN103634054B (en) * | 2012-08-23 | 2016-01-20 | 北京邮电大学 | Linear damage for high speed coherent reception system compensates and polarization demultiplexing method |
| CN103731215A (en) * | 2013-11-15 | 2014-04-16 | 成都市宏山科技有限公司 | Optical line terminal with two-stage temperature monitoring |
| CN104579490A (en) * | 2014-12-12 | 2015-04-29 | 武汉电信器件有限公司 | Highly integrated OLT optical module |
| CN104579490B (en) * | 2014-12-12 | 2017-06-13 | 武汉电信器件有限公司 | A kind of highly integrated OLT optical modules |
| WO2017101438A1 (en) * | 2015-12-14 | 2017-06-22 | 中兴通讯股份有限公司 | Bandwidth scheduling method, onu registration method, device and olt |
| CN107517080A (en) * | 2016-06-17 | 2017-12-26 | 中兴通讯股份有限公司 | A kind of luminous power detection method, device, equipment and optical module |
| CN107517080B (en) * | 2016-06-17 | 2021-06-11 | 中兴通讯股份有限公司 | Optical power detection method, device, equipment and optical module |
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Application publication date: 20100106 |