CN102447511B - Light path tester - Google Patents
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- CN102447511B CN102447511B CN201010506906.2A CN201010506906A CN102447511B CN 102447511 B CN102447511 B CN 102447511B CN 201010506906 A CN201010506906 A CN 201010506906A CN 102447511 B CN102447511 B CN 102447511B
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Abstract
The invention relates to a light path tester, which comprises a shell body, a power supply device, a light signal display circuit, an optical module and a light receiving detection circuit, wherein the optical module is provided with a light input interface and an output level interface; the light receiving detection circuit is connected with the output level interface and the light signal display circuit; the power supply device supplies power to the optical module and the light receiving detection circuit; the optical module further comprises a light output interface and an input level interface for optical signal illumination; and the power supply device, the optical module and the light receiving detection circuit are all accommodated in the shell body. Compared with the existing optical tester, the light path tester adopts qualitative test and indicating lamp display to judge whether the optical signal exists or not, the requirements on test precision, test display and maintenance personnel quality are reduced, the manufacturing cost is far lower than the price of the existing optical tester, the requirement of light path detection can be satisfied, the maintenance cost and investment are also greatly saved, and furthermore, more economic benefit is produced.
Description
Technical field
The present invention relates to the network communications technology, particularly relate to the light path tester that one is applied to EPON (Passive Optical Network is called for short PON).
Background technology
Along with the fast development of Internet, the demand of the network user to the network bandwidth day by day increases, and broadband user not merely meets common website browsing.High-quality IPTV service becomes mainstream applications gradually to the requirement of access bandwidth, the demand, video conference, high-speed downloads etc. of user to upstream rate.In order to meet the needs in market, the core network part of communication network there occurs huge change, and change less conventional access network (Access Network mainly refers to the network from telecommunications room to user side) always and become bottleneck in whole network, various new broadband access technologys become the focus of research, and the FTTH utilizing PON to carry out networking becomes current main flow access way.
PON is a kind of novel intelligent acess network technology, it adopts point-to-multipoint structure, passive fiber to transmit, multiple business is provided on Ethernet, not only broadband services can be provided, also can provide voice service, PON has low cost, high bandwidth, autgmentability feature that is strong, that serve fast flexibly simultaneously.
Due to the many merits of PON, it is more and more subject to the favor of people, and being about to becomes the most effective communication means of broadband access network one.While current each telecom operators provide broadband access network and voice service at the same time, also save a large amount of expensive copper cable resource, newly-built community adopts PON technology to access substantially.How to serve the PON user Shi Ge telecom operators most important thing that these increase rapidly.
The transmission characteristic of PON access technology as shown in Figure 1.Local side OLT (optical line terminal) light signal receives ODF (Optical DistributionFrame through jumping fiber again through output port A, be called for short ODF) the B mouth of jumping fiber frame 1, B mouth receives the C mouth of ODF jumping fiber frame 1 through jumping fiber, C mouth is through the D mouth of Fiber connection to ODF jumping fiber frame 2, again by jumping fiber to E mouth, E mouth accesses backbone optical cable again, backbone optical cable arrives the light fibre melting disc 1 in optical cross box, light fibre melting disc 1 arrives the G mouth of light fibre melting disc 2 through jumping fiber by F mouth, the light fibre melting disc 3 of light fibre melting disc 2 in optical fiber arrival floor light junction box, light fibre melting disc 3 arrives the input I mouth of optical splitter through jumping fiber by H mouth, optical splitter arrives the K mouth of light fibre melting disc 4 through delivery outlet J, light fibre melting disc 4 arrives the light fibre melting disc 5 in user family's multimedia-box through optical fiber, light fibre melting disc 5 arrives the input port M of ONU (optical network unit) through delivery outlet L, ONU completes opto-electronic conversion, PC is accessed by netting twine.
One road PON subscriber signal is transferred to user ONU from OLT and has to pass through ODF jumping fiber frame 1, ODF jumping fiber frame 2, optical cross box, floor junction box, customer multi-media box.So in time can not receive OLT light signal in user family.Light signal likely in OLT switch to the jumping fiber in ODF jumping fiber frame 1, ODF jumping fiber frame 1 to ODF jumper wire rack 2, ODF jumping fiber frame 2 to optical cross box, optical cross box, optical cross box to floor junction box, floor light junction box in ODF jumping fiber or floor fiber distribution box stop transmitting backward in the multistage optical cable such as in customer multi-media box.When user ONU can not receive light signal, in order to detection failure, need to carry out signal measurement by instrument piecemeal at above-mentioned section, to remove barriers fast, the test point that may relate to is the points such as A, B, C, D, F, J, K, L, M.
Because PON technology utilizes optical cable to carry out transfer of data, this transmission technology is different from cable transmission technology completely, needs the test instrumentation of configure dedicated just can carry out corresponding engineering and maintenance.And current optical tests instrument adopts professional instrument substantially, its, support multi-wavelength high to required precision, and be provided with display screen, have a lot of operation keyss etc., but this also causes its complex structure, volume is large, operates loaded down with trivial details, with high costs, price can up to several thousand yuan every platform, attendant's staff one cannot be spread to, in use also very inconvenient, especially out of doors operation time all the more so.
Summary of the invention
Inventor is to fiber to the home (Fiber To The Home, be called for short FTTH) installation and maintenance actual investigation and test in, find in the test process to PON light path, the concrete light intensity value of traditional optical tests instrument display the emphasis of non-test, and maintenance personnel is it is of concern that 2 points, one is whether this section of circuit has light to come, and two is whether luminous intensity can meet ONU equipment cleaning door limit value.And add up in the process of handling failure, the obstacle of 85% can by having judged whether that light signal just can carry out fault location and process.
In other words, a lot of functions that traditional optical tests instrument has do not need for the test of Access Layer optical fiber, such as support multi-wavelength, configuration display screen, require higher precision etc., the service band of particular range of wavelengths only need be supported in reality test, require lower to measuring accuracy, display screen is not needed to show yet, therefore by only the test effect that simple and practical test function just can reach PON light path need be arranged in test view, this not only greatly can reduce the cost of tester, and also can reduce on volume, thus be convenient for carrying.
The object of the invention is to propose a kind of light path tester, have with low cost, volume is little, is easy to carry about with one and operates, and is convenient to the feature popularized.
For achieving the above object, the invention provides a kind of light path tester, comprising:
Housing;
Power supply device;
Light signal display circuit;
Optical module, has a smooth input interface and an output level interface, the light signal that described optical module receives for detecting described smooth input interface, and exports corresponding level signal by described output level interface;
Receive optical detection circuit, be connected with light signal display circuit with described output level interface, for selecting trigger or do not trigger light signal display circuit according to the level signal received;
Described power supply device for described optical module and receive optical detection circuit power supply is provided;
Described power supply device, optical module, receipts optical detection circuit are all contained in described housing.
Further, described power supply device comprises battery flat, can install the battery of predetermined number and specification in described battery flat.
Optionally, described power supply device comprises rechargeable battery and the charging circuit for described rechargeable battery charging.
Further, described optical module also has a light output interface and a high-frequency signal input interface, and described optical module also for receiving the high-frequency signal that described high-frequency signal input interface receives, and passes through described light output interface output optical signal.
Further, also comprise high-frequency signal and produce circuit in described housing, described high-frequency signal produces the signal output of circuit and is connected with the high-frequency signal input interface of described optical module.
Preferably, described high-frequency signal produces circuit and comprises crystal oscillating circuit, shaping circuit and signal level match circuit, and described crystal oscillating circuit, shaping circuit are connected successively with signal level match circuit.
Preferably, described high-frequency signal produces circuit and is also connected with high-frequency signal display circuit, is triggered when connecting described high-frequency signal and producing circuit.
Optionally, be also serially connected with the attenuator arranging at described housing or arrange in described housing outward at the light input interface of described optical module, for regulating the cleaning door limit value of described light path tester.
Optionally, in described housing, also comprising undervoltage detection circuit, for detecting the supply voltage of described power supply device, and alarm being carried out to undervoltage condition.
Preferably, described undervoltage detection circuit is also connected with under-voltage signal display circuit, is triggered when undervoltage condition being detected.
Based on technique scheme, light path tester of the present invention is compared to existing optical tests instrument, qualitative test and indicator light display is adopted to judge the presence or absence of light signal, the precision of optical module only needs to be consistent with the light precision of ONU equipment just passable, the requirement to optical module precision can be greatly reduced like this, and the minimum threshold that the optical gate limit value of tester and ONU normally work is consistent or closely its work thresholding, as long as tester shows light for this reason, must be just meet the qualified light signal strength that ONU normally works, attendant is not needed to go to be concerned about design parameter, decrease measuring accuracy, the requirement of test display and attendant's quality.Light path tester of the present invention can be applied in the FTTH that common carrier is built at present in a large number, parts needed for its inside are less, and low to the requirement of precision, wavelength kind, also lower to the requirement of display, therefore cost is far below the price of existing optical tests instrument.And become the main construction mode in broadband of common carrier along with FTTH, therefore light path tester of the present invention not only can meet the demand that light path detects, and has greatly saved maintenance cost and investment, and then produces larger economic benefit.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the transmission schematic diagram of existing PON access technology.
Fig. 2 is the structural representation of an embodiment of light path tester of the present invention.
Fig. 3 is the structural representation of another embodiment of light path tester of the present invention.
Fig. 4 is the structural representation of an embodiment again of light path tester of the present invention.
Fig. 5 is the structural representation of the another embodiment of light path tester of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Mention above, inventor, in the actual investigation and test of FTTH installation and maintenance, find in the test process to PON light path, maintenance personnel is it is of concern that whether this section of circuit has light to come, and whether luminous intensity can meet ONU equipment cleaning door limit value.And add up in the process of handling failure, the obstacle of 85% can by having judged whether that light signal just can carry out fault location and process.
Based on these actual conditions, the present invention redesigns the inside composition of light path tester, as shown in Figure 2, is the structural representation of an embodiment of light path tester of the present invention.In the present embodiment, light path tester comprises housing 1, accommodates power supply device 2, light signal display circuit 3, optical module 4 and receive optical detection circuit 5 in housing 1.Power supply device 2 is for optical module 4 and receive optical detection circuit 5 and provide power supply.
Optical module 4 has smooth input interface 41 and an output level interface 42, the light signal that optical module 4 receives for detecting light input interface 41, and exports corresponding level signal by output level interface 42.Optical module can adopt obtainable existing optical module on market, the model optical modules such as such as OCM3351 and OCM3451, these optical modules all have light transceiver interface usually, power supply supply and data-signal send and receiving interface, can utilize loss of gloss alarm interface and the data signal reception interface of this optical module in the embodiment of the present invention.Loss of gloss alarm interface can export different level signals when optical module can not receive light or light-receiving intensity does not reach optical module cleaning door limit value, differentiates for follow-up receipts light detection module.
Receive optical detection circuit 5 to be connected with light signal display circuit 3 with output level interface 42, receiving optical detection circuit 5 can select trigger or do not trigger light signal display circuit 3 according to the level signal received.For optical module example given above, the level signal that the loss of gloss alarm interface that the input signal receiving optical detection circuit comes from optical module exports.Receive optical detection circuit to be made up of signal comparator circuit (such as LM339 etc.) and voltage clamp circuit, by the reference voltage of voltage clamp circuit setting comparison circuit.Utilize comparison circuit to the voltage of level signal relatively realize judge with presence or absence of light signal, and drive relevant display circuit with this.
Power supply device 2 can adopt external application power supply, also can adopt built-in power, and built-in power can comprise battery flat, can install the battery of predetermined number and specification in battery flat.Battery can adopt dry cell or rechargeable battery.Built-in power also can comprise rechargeable battery and the charging circuit for described rechargeable battery charging.Built-in power carries with easy to use, and price is also cheaper.
In actual use, if user ONU can not receive light signal, attendant receives report barrier, then start to utilize light path tester of the present invention to carry out light path troubleshooting from user side, can start test light signal piecemeal the light input interface of optical module is received light transit point according to the network characteristics of FTTH.If the instruction of light path tester does not receive light, just proceed to upstream light transit point and test, when certain light transit point of discovery has light signal, but first, its downstream does not have the light transit point of light signal, just can judge that this light transit point is fault point.
If light path tester detects the light signal that light input interface receives, and export corresponding level signal (such as high level) by output level interface, receive optical detection circuit and select to trigger light signal display circuit according to the level signal received (high level); If the light signal that light input interface receives do not detected, and export corresponding level signal (such as low level) by output level interface, receive optical detection circuit and select not trigger light signal display circuit according to the level signal received (low level).
What optical module had regulation usually accepts sensitivity, such as-23dbm, namely only has light signal can be detected by optical module when being greater than-23db.Normal light signal probably can reach-16 ~-23db from OLT to user, if do not have fault, then clearly can be detected by light path tester of the present invention.Optical module adopts current obtainable optical module.
Light signal display circuit can adopt the simple LED of structure, and whether show this light transit point by the light on and off of LED has light signal; Also can adopt other indicating mode, such as small-sized liquid crystal display screen, by screen display specific character such as have light, unglazed come pilot light signal with or without.These circuit all do not need to carry out analog-to-digital conversion, the concrete numerical value of accurate display light intensity thus saved the holistic cost of light path tester, therefore practical and cheap.
As shown in Figure 3, be the structural representation of another embodiment of light path tester of the present invention.Compared with a upper embodiment, the optical module 4 of the present embodiment also has light output interface 43 and a high-frequency signal input interface 44, and optical module 4 can receive the high-frequency signal that high-frequency signal input interface 44 receives, and by light output interface 43 output optical signal.
High-frequency signal input interface 44 can connect with the high-frequency signal of outside, also can produce circuit 6 and be connected by the high-frequency signal built-in with light path tester.High-frequency signal produces circuit 6 and is also connected with high-frequency signal display circuit 7, and high-frequency signal display circuit 7 can adopt the simple LED of structure, high-frequency signal produce that is to say that light signal sends when circuit 6 is connected time, high-frequency signal display circuit 7 is triggered and luminous.High-frequency signal produces circuit 6 and crystal oscillating circuit can be adopted to realize, but the signal of crystal oscillating circuit generation cannot Direct driver optical module, need input optical module again after shaping circuit.
Implementation is crystal oscillating circuit+shaping circuit, and wherein shaping circuit can by similar module compositions such as 7406 or 7404, and the high-frequency signal for crystal oscillating circuit is produced amplifies driving optical module luminescence afterwards.For the optical module of some classifications, such as ocm3511 its need PECL level (namely voltage jump scope is 3.7 ~ 4.2v) to input, now can access a signal level match circuit (such as PECL level shifting circuit) after shaping circuit, such as SY10ELT22, is converted to 0 ~ 4v change that previous module produces the change in voltage of 3.7 ~ 4.2v.
Compared to previous embodiment, the present embodiment also possesses lighting function, can simulate local side light signal, and do not having in light source situation, two light path testers can be received and dispatched each other, can detect the quality of optical splitter and single light path.
As shown in Figure 4, be the structural representation of an embodiment again of light path tester of the present invention.Compared with several embodiments above, the light input interface 41 of the optical module 4 of the present embodiment can also be connected in series attenuator 8, when the work thresholding of optical module is lower than specified thresholds (such as-25db), in other words, when the sensitivity of optical module can reach such as-35db, at this moment first decayed by the light signal entering light input interface 41 by attenuator 8, such as decay 10db, thus make optical module adapt to different specified thresholds, make near its adjustment of sensitivity to-25db.
Attenuator 8 in the outer setting of housing 1, also can be arranged in housing 1.Concerning user, the mode of peripheral hardware more conveniently can adjust the degree decayed, and built-in mode then cost is cheaper.Considering that the undertension of light path tester can have influence on the test of light signal, therefore can also add undervoltage detection circuit in light path tester, as shown in Figure 5, is the structural representation of the another embodiment of light path tester of the present invention.The present embodiment, compared to front several embodiment, adds undervoltage detection circuit 9 in housing, can detect, and carry out alarm to undervoltage condition to the supply voltage of power supply device 2.Undervoltage detection circuit 9 can also connect under-voltage signal display circuit 10, and when undervoltage detection circuit 9 detects undervoltage condition, under-voltage signal display circuit 10 is triggered and luminous.Undervoltage detection circuit can be made up of voltage clamp circuit (such as TL431 etc.) and comparison circuit (such as LM339), the reference voltage of comparison circuit can be set by voltage clamp circuit, by comparing supply power voltage and reference voltage, carry out the interpretation that whether can normally work to supply power voltage.
In the technical scheme of each embodiment above-mentioned, the switching circuit adopted both can adopt mechanical, also can adopt monostable circuit.The mode of monostable circuit mainly realizes the open-minded of electronics trigger higher frequency signal generating circuit by NE555 module, compared to mechanical switch, only need click the control that just can realize illuminating circuit to button gently, control more reliable, safe and light.
In sum, light path tester of the present invention has the following advantages:
1, it is circuit common element that the various circuit that light path tester of the present invention uses all can adopt, and realize light signal by specific connected mode and receive differentiation and send, scheme is simple and practical;
2, light path tester of the present invention can possess optical transmit-receive function simultaneously, becomes the duplexing instrument of light transmitting and receiving;
3, light path tester of the present invention due to the circuit of inside simple, compact conformation, therefore takes up room little, easy to carry, simple to operate;
4, the price of the optical module that adopts of light path tester of the present invention and peripheral circuit is all very cheap, and therefore separate unit cost is much lower compared to existing test instrumentation, therefore can produce in a large number and copy, and can extensively promote;
5, light path tester of the present invention just can complete optical signal detecting by means of only less electrical energy, and equipment power dissipation is low, and stand-by time is long.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be contained, such as, compared and the similar functions such as the generation of high-frequency signal by chip microcontroller signal, in the middle of the technical scheme scope of request protection of the present invention.
Claims (8)
1. a light path tester, comprising:
Housing;
Power supply device;
Light signal display circuit;
Optical module, has a smooth input interface and an output level interface, the light signal that described optical module receives for detecting described smooth input interface, and exports corresponding level signal by described output level interface;
Receive optical detection circuit, be connected with light signal display circuit with described output level interface, for selecting trigger or do not trigger light signal display circuit according to the level signal received;
Described power supply device for described optical module and receive optical detection circuit power supply is provided;
Described power supply device, optical module, receipts optical detection circuit are all contained in described housing;
Described optical module also has a light output interface and a high-frequency signal input interface, described optical module is also for receiving the high-frequency signal that described high-frequency signal input interface receives, and by described light output interface output optical signal, described light path tester possesses lighting function, local side light signal can be simulated, do not having in light source situation, two described light path testers can be received and dispatched each other, to detect the quality of optical splitter and single light path;
The light input interface of described optical module is also serially connected with the attenuator arranging at described housing or arrange in described housing outward, for regulating the cleaning door limit value of described light path tester.
2. light path tester according to claim 1, wherein, described power supply device comprises battery flat, can install the battery of predetermined number and specification in described battery flat.
3. light path tester according to claim 1, wherein, described power supply device comprises rechargeable battery and the charging circuit for described rechargeable battery charging.
4. light path tester according to claim 1, wherein, also comprise high-frequency signal and produce circuit in described housing, described high-frequency signal produces the signal output of circuit and is connected with the high-frequency signal input interface of described optical module.
5. light path tester according to claim 4, wherein, described high-frequency signal produces circuit and comprises crystal oscillating circuit, shaping circuit and signal level match circuit, and described crystal oscillating circuit, shaping circuit are connected successively with signal level match circuit.
6. the light path tester according to claim 4 or 5, wherein, described high-frequency signal produces circuit and is also connected with high-frequency signal display circuit, is triggered when connecting described high-frequency signal and producing circuit.
7. light path tester according to claim 1, wherein, also comprises undervoltage detection circuit in described housing, for detecting the supply voltage of described power supply device, and carries out alarm to undervoltage condition.
8. light path tester according to claim 7, wherein, described undervoltage detection circuit is also connected with under-voltage signal display circuit, is triggered when undervoltage condition being detected.
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| CN102447511B true CN102447511B (en) | 2015-05-13 |
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| CN103051379B (en) * | 2013-01-06 | 2016-04-20 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module debug system |
| CN104144012B (en) * | 2013-05-10 | 2017-03-29 | 中国电信股份有限公司 | A kind of optical property detecting system and method for FTTx access networks |
| CN104218987B (en) * | 2013-05-31 | 2017-04-12 | 中国电信股份有限公司 | Optical link detecting method, system and detector in passive optical network |
| CN106357328B (en) * | 2016-08-26 | 2018-08-10 | 四川九州电子科技股份有限公司 | Set-top box input optical power detection device |
| CN112865860B (en) * | 2021-01-05 | 2022-04-26 | 深圳市双翼科技股份有限公司 | Calibration method and device for trillion passive optical network BOB equipment |
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| CN1661940A (en) * | 2004-02-24 | 2005-08-31 | 和心光通科技股份有限公司 | Photodetection device |
| CN201429496Y (en) * | 2009-04-22 | 2010-03-24 | 上海胜诺通信技术有限公司 | Multifunctional optical fiber test instrument |
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| JP2005184772A (en) * | 2003-09-12 | 2005-07-07 | Oki Electric Ind Co Ltd | Optical fiber sensor system and external force detecting sensor |
| WO2007083660A1 (en) * | 2006-01-20 | 2007-07-26 | Sumitomo Electric Industries, Ltd. | Light source device |
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| CN1661940A (en) * | 2004-02-24 | 2005-08-31 | 和心光通科技股份有限公司 | Photodetection device |
| CN201429496Y (en) * | 2009-04-22 | 2010-03-24 | 上海胜诺通信技术有限公司 | Multifunctional optical fiber test instrument |
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