CN1130965A - Optical modular control device for monitoring optical fiber cables - Google Patents
Optical modular control device for monitoring optical fiber cables Download PDFInfo
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- CN1130965A CN1130965A CN95190671.2A CN95190671A CN1130965A CN 1130965 A CN1130965 A CN 1130965A CN 95190671 A CN95190671 A CN 95190671A CN 1130965 A CN1130965 A CN 1130965A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 131
- 239000013307 optical fiber Substances 0.000 title claims description 51
- 238000012544 monitoring process Methods 0.000 title abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000007850 degeneration Effects 0.000 description 2
- 241001234523 Velamen Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- Electromagnetism (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The optical control device comprises a microprocessor intended to process the input signals supplied thereto and provide the address instructions for the optical switch, an optical coupler intended to take a portion of the input optical signal transmitted thereto for a further treatment, a photodetector connected to said optical coupler and said microprocessor and intended to convert said portion of optical signal from said optical coupler into electrical pulses and to supply them to the microprocessor and a pair of identifier switches connected to the microprocessor. The device can be electrically or optically addressed by including a pair of parallel ports for permitting the electrical connection of the optical control device to an external driving unit, if present, and the local cascade connection of a plurality of devices in order to obtain a modular monitoring system.
Description
The present invention relates generally to a kind of surveillance of optical cable, relate in particular to the optical control device that this system uses.
Telecommunications network utilizes optical fiber to extend continuously in the whole world, it is necessary to make existing surveillance to be adapted to monitor the new optical technology of the optical fiber that forms optical cable.
It is the attenuation characteristic that allows to determine and be controlled at the light signal that transmits in the optical fiber that optical fiber is controlled.
It is very necessary carrying out this control, because the optical fiber that uses in these communication networks is subjected to the influence of slowly degenerating always, this slow degeneration is mainly determined by the degeneration that fiber stress, moisture enter optical cable or connector and connector.
The control of optical fiber in the communication network is normally carried out during the working life of installation steps and optical fiber, and available instrument is finished on the available markets, these instruments can directly provide required attenuation characteristic, and be referred to as optical time domain reflectometer (OTDR), for for simplicity, optical time domain reflectometer is called reflectometer hereinafter.
At present, only under the situation that causes damage by portable reflectometer, just optical fiber on duty control, be this means because of can be along an Optical Fiber Transmission lot of data, so business and cost of labor are very high with reflectometer.
Therefore, very importantly, need the such surveillance of exploitation, they can have under the situation of damage preventative analysis and quick and the reliable diagnostic that need not portable reflectometer just can finish the optical fiber integrality.
Use the communication network of optical fiber to be formed by the multi beam multifiber cable usually, these bundles interconnect by the branch node that is distributed on the wide region.In order to control every optical fiber in the optical cable, use a reflectometer, it is suitable for controlling in real time an optical fiber, and links to each other with an optical switch, and optical switch makes every velamen check that optical fiber links to each other with reflectometer; The drive signal that provides with the outside makes optical switch select the required optical fiber that is examined.
Done various effort, so that the central monitoring system that uses optical switch to be provided, wherein optical switch is associated with each reflectometer that is positioned at each major node of communication network.Do the integrality that to control the every optical fiber that links to each other with node in advance like this, but need unaffordable cost.
More perfect system is equipped with the single reflectometer that is associated with the optical switch of oneself, and this optical switch is called main switch here, and this reflectometer is positioned at single main exchange, and system also is equipped with secondary optical switch, and it is arranged in each branch node of communication network.In this case, in order to make required optical fiber and the interconnection of single reflectometer that belongs to any one branch node of network, with the control computer that each secondary optical switch links to each other drive signal is offered all optical switches with the single reflectometer that has the key light switch, thereby allow to carry out the loop control that to programme according to the action required sequence.
Unfortunately, this type systematic is very complicated, they require all secondary optical switches are controlled or sequential control simultaneously, and all secondary optical switches are produced by computer and pass through the driving of modulator-demodulator control signals transmitted, therefore need that extra expensive (each secondary optical switch all has a modulator-demodulator to be associated with it, be used for receiving control signal) from computer, in addition, for required optical fiber or optical cable are linked to each other with reflectometer, must the be linked in sequence secondary optical switch of all cascades is so the response time is very slow.
Main purpose of the present invention is, a kind of fiber optic surveillance system of communication network is provided, and this system can check each the root optical fiber in the network, thereby avoids driving secondary optical switch by the connection of the modulator-demodulator on the exchange line.
Another object of the present invention is, the optical control device that fiber optic surveillance system uses in a kind of communication network is provided, this device can be used on that the light signal that transmits on the connected optical fiber drives or also capable telecommunications number drive.
A further object of the present invention is, the optical control device that fiber optic surveillance system uses in a kind of communication network is provided, and this device is easy to expand for each node that makes network, the unit of a plurality of parallel connections can also be done the modular connection.
Particularly, the optical control device of fiber optic surveillance system has an optical switch at least in the communication network of the present invention, and it is characterized in that comprising:
Microprocessor, it handles the input signal that offers it, and relevant addressing instruction is offered optical switch;
Optical coupler, it links to each other with the input of optical switch, and gets the input optical signal that a part is transferred to it and further process;
Photodetector, it links to each other with described microprocessor with described optical coupler, and will convert electric pulse to from the described part of the light signal of described optical coupler, then electric pulse is offered microprocessor;
A pair of identification switch, they link to each other with microprocessor; Wherein said microprocessor, described photodetector and described optical switch are powered by a public power, and described optical control device can optical drive.
According to feature of the present invention, optical control device also has a pair of parallel port, one is input port, another is an output port, they allow an optical control device and an external driver device (if any) to be electrically connected, and, allow the local cascade of a plurality of optical control devices in order to obtain to have the modular surveillance system of required port number.
With reference to accompanying drawing, in conjunction with only as an example preferred embodiment, the present invention is described in more detail, wherein:
Fig. 1 is the schematic diagram of general fiber optic communication network;
Fig. 2 is the schematic diagram of the communication network fiber optic surveillance system of routine;
Fig. 3 illustrates conventional communication network optical fiber central monitoring system, and this system uses by the optical switch of single controller by the modulator-demodulator individual drive;
Fig. 4 shows the central monitoring system of communication network optical fiber of the present invention, and this system uses the optical switch by the light signal individual drive;
Fig. 5 shows the block diagram of optical control device of the present invention; And
Fig. 6 shows the parallel line map that connects of a plurality of optical control devices of the present invention.
In Fig. 1, show general communication network by fiber work, it comprises a plurality of exchanges with letter representations such as A to M, and the optical cable of representing with labels such as L1 to L13 between the exchange interconnects, thereby provides suitable branch to connect according to the distribution requirement of communication network.Every optical cable comprises the simple optical fiber of many transmitting optical signals again.
Fig. 2 shows the conventional surveillance of Fig. 1 communication network optical fiber, and this system generally comprises with unit cable 6 and is connected to the reflectometer 5 of key light switch 7A and a plurality of secondary optical switch 7B, the 7C of cascade mutually ...Each optical switch 7A, 7B, 7C ... have output 1,2,3,4 and N, wherein N represents the port that links to each other with the optical fiber that is monitored.Reflectometer 5 and key light switch 7A are positioned at certain intra-exchange of communication network, and as the exchange D among Fig. 1, each secondary optical switch then is positioned at each adjacent intra-exchange on every side, as A, B, C, E, F ...To all optical switch 7A, 7B, 7C ... after carrying out the required addressing of suitable connection, said structure just can link to each other unique reflectometer 5 with any optical fiber in the communication network.In order to utilize the parts of communication network shown in Figure 1 better, reflectometer 5 must be placed on the intra-exchange that is positioned at the communication network center, this is to be monitored the fiber count maximum in order to make as the function of reflectometer 5 obtainable maximum surveillance distance.
Suitably to optical switch 7A, 7B, 7C ... addressing can be finished being connected between n root simple optical fiber and the reflectometer 5, and the light signal that this process allows reflectometer 5 is provided sends to the optical fiber that need be monitored.Therefore, even the remote attenuation characteristic that also can obtain every optical fiber of distance.Thus, above-mentioned central monitoring system must require each exchange E, A around laying respectively at ... in optical switch 7B, 7C ... carry out suitable driving operation.For example, under the described situation of Fig. 2, reflectometer 5 offers its light signal the port one of key light switch 7A, the output of key light switch 7A is as the input of the secondary optical switch 7B that is addressed, thereby this light signal is delivered to port 3, and the output of optical switch 7B offers the optical switch 7C that is addressed as input, thereby signal is sent to and is monitored optical fiber corresponding ports N.
Fig. 3 shows by the commercially availabie modulator-demodulator that is used for optical fiber and comes the classical control system of work, and plans this system is used for surveillance shown in Figure 2.This system comprises a computer 8 in fact, and the driving command that the optical fiber that this computer will allow by modulator-demodulator to be monitored links to each other with reflectometer 5 offers each exchange A-M ... each optical switch 7A, 7B, 7C ...Fig. 3 illustrates reflectometer 5, key light switch 7A, relevant connection 6 and is used for being placed among the exchange D with the modulator-demodulator 10 of modulator-demodulator 9 switching signals.As shown in the figure, optical switch 7B, the 7C and the 7E that lay respectively in exchange E, B and the A have been equipped with modulator-demodulator 12B, 12C and 12E again respectively, are used for receiving address signal from the modulator-demodulator 11 that links to each other with computer 8.In this process, control computer 8 starts reflectometer by modulator- demodulator 9 and 10, and to key light switch 7A addressing, and modulator-demodulator 11 drives secondary optical switch 7B, 7C, 7E in order ... thereby as desired, the light signal that produces in the reflectometer is sent to the simple optical fiber that need be monitored.Therefore, the central drive system of optical switch shown in Figure 3 is used a large amount of modulator-demodulators, because transmission needs to realize Route Selection to relevant optical switch by modulator-demodulator, so this can cause very high cost and idle time.
Fig. 4 shows surveillance of the present invention, in this system, uses the light signal by being present in the identical optical cable transmission in the network that the optical switch in the exchange is driven operation.In this system, control computer 8 by modulator- demodulator 9 and 10 with reflectometer 5 switching signals (another kind of way is by the optical cable of connecting), and as following better description, the control computer can drive and lay respectively at downstream exchange D, E, G, B ... in each optical switch 13A, 13B, 13E, 13G ...
In order to carry out the Route Selection of optics according to schematic diagram shown in Figure 4, Fig. 5 shows the block diagram of optical control device of the present invention.
This device comprises the optical switch 13 of a routine, and it has an input port 14 and many output ports 31.What link to each other with optical switch 13 is optical coupler 15, and optical coupler links to each other with photodetector 16 by optical transmission line 17 again.Photodetector 16 links to each other with microprocessor 18 by circuit 19 again, and described microprocessor 18 is used for receiving the signal of telecommunication from photodetector 16, to produce the address that will offer optical switch by parallel connecting line 32.This device also comprises a pair of identification switch 20 and 21, and they are connected to microprocessor 18 by circuit 22 and 23 respectively, and device also comprises an input parallel port 24 and an output parallel port 25, they also the connecting line 26 and 27 by separately be connected to microprocessor 18.Public power 28 provides necessary electric power by corresponding connecting line 29 and 30 to optical switch 13, microprocessor 18 and photodetector 16 respectively.
By only introducing insignificant decay, 15 couples of input signal IN of optical coupler sample and send it to photodetector 16 by optics connecting line 17, the task of photodetector is that the light signal that will be provided converts the signal of telecommunication to, and the latter is offered microprocessor 18.Identification switch 20 is provided with the binary code of univocality ground identification optical control device and this code is offered microprocessor 18 by connecting line 22, and identification switch 21 then is provided with the number of drivable optical switch port 31 by connecting line 23.
In said apparatus, be different from existing other optical switches, can electrically or optically carry out addressing operation to switch itself.
Under the situation of preceding a kind of control device, can omit photodetector 16 and optical coupler 15.The address (generally being binary-coded address) that control device receives connected optical fiber by unique information port 24.Control device is by reading the logic state of identification switch 20 and 21, the optical fiber that will suitably handle the information that receives and select to connect by microprocessor 18.
Under latter event, input optical fibre plays carrier, is used to finish selection.Control device receives input optical signal by input port IN, wherein the part input optical signal also is provided for photodetector 16, and after these light signals are converted to the signal of telecommunication, they are offered microprocessor 18, and the task of microprocessor 18 is to distinguish selection information from all the other information of optical fiber.Constantly very accurately, transmit this selection signal with the form of light pulse.Whether will be at the optical switch number that has confirmed to receive with after the number that is provided with in identification switch 20 is corresponding, control device reads selecteed fiber count.
Therefore, optical drive allows in fact the transmitting device of the optical fiber that enters optical switch as the drive signal of suitably obtaining, discerning and handle through microprocessor, make microprocessor carry out addressing to optical switch, thereby the identical functions that obtains by modulator-demodulator according to schematic diagram shown in Figure 3 in acquisition and the preamble, but in the present embodiment, time significantly shortens, better reliability, and equipment cost will reduce a lot.
Another essential characteristic of the optical control device of describing among Fig. 5 is as shown in Figure 6, can make these install local cascade with parallel input port 24 and parallel output terminal mouth 25.Can see that by Fig. 6 three Optical devices 33,34 and 35 are connected to each other.Therefore device 33 expression key light switches have photodetector 16 and optical coupler 15, and install 34 and 35 vice optical switches, so photodetector and optical coupler are omitted.In this way, come local expansion can be connected to the output optical fibre 41,42 of single input optical fibre IN and 43 number like this: simply the input parallel port 24 of first device 33 the output parallel port 25 and second device 34 to be linked to each other and carefully will install last root output optical fibre 36 and second of 33 and install 34 input optical fibre and link to each other; Between second device the 34 and the 3rd device 35, reach later device and carry out identical connection.The local possibility that expands does not limit the number of the controlled optical fiber of energy in fact, obtain a kind of modular thus and from structure formula system, in this system, single optical switch can be selected a large amount of optical fiber under the optics control of input optical fibre, so input optical fibre is represented the carrier of route control signal.Microprocessor is produced errorless light select signal to be superimposed upon other measuring-signals and upward transmission of light instruction, and provide with the form of light pulse.This signal is generally formed by 32.Should point out that the optics control signal is produced by reflectometer, reflectometer comprises a generator, and light pulse and measurement that generation control downstream optical switch is used are monitored the light pulse that the optical fiber attenuation curve is used.
This shows, because optical control device of the present invention has following advantage, so significant technological progress is arranged with respect to current solution:
With the electric driving Optical devices of the signal of telecommunication that provides on the input port;
With the light signal optical drive Optical devices that provide on the switch input terminal;
With a reflectometer all optical assemblies is made optics and switch, allow that any simple optical fiber (or even at a distance) is monitored to be driven, the reliability height, cost is low, and the spended time that optics switches is more much lower than conventional;
By with the multiple arrangement simple cascade, can in exchange, realize modular and from the expansion of structure formula.
Though describe and illustrated the present invention in conjunction with preferred embodiment of the present invention, obviously those skilled in the art can not depart from the scope of the present invention and carry out all variations and change.
Claims (6)
1. the optical control device of a communication network fiber optic surveillance system, it has an optical switch at least, it is characterized in that, comprising:
Microprocessor (18) is used for handling the input signal that offers it, and relevant addressing instruction is offered optical switch (13);
Optical coupler (15), it links to each other with the input of optical switch (13), and is used for getting the input optical signal that a part is transferred to it and further processes;
Photodetector (16), it links to each other with described microprocessor (18) with described optical coupler (15), and is used for converting the described part from the light signal of described optical coupler (15) to electric pulse, then electric pulse is offered microprocessor (18);
A pair of identification switch (20,21), they link to each other with microprocessor; Wherein said microprocessor (18), described photodetector (16) and described optical switch (13) are by a public power (28) power supply, and described optical control device can optical drive.
2. optical control device as claimed in claim 1, it is characterized in that, it also comprises a pair of parallel port (24,25), one of them is an input port, and another is an output port, and they are used for making an optical control device and an external driver device (if any) to be electrically connected, and, allow the local cascade of a plurality of optical control devices in order to obtain to have the modular surveillance system of required port number.
3. optical control device as claimed in claim 2 is characterized in that, first last root output optical fibre (36) that installs optical switch (13) in 33 is connected to the second next optical switch (13) that installs in (34) as input optical fibre, and the like.
4. optical control device as claimed in claim 1 is characterized in that, an identification switch (20) is used for being provided with the univocality code of identification optical control device, and another identification switch (21) then is used for being provided with the drivable port number of optical control device.
5. optical control device as claimed in claim 2 is characterized in that, electrically optical switch is carried out addressing operation with the signal of telecommunication that provides by input parallel port (24).
6. optical control device as claimed in claim 5 is characterized in that, for the situation of carrying out addressing operation with the signal of telecommunication, can omit photodetector (16) and optical coupler (15).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI94A001659 | 1994-07-29 | ||
| ITMI941659A IT1274680B (en) | 1994-07-29 | 1994-07-29 | MODULAR OPTICAL CONTROL DEVICE FOR MONITORING OF FIBER OPTIC CABLES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1130965A true CN1130965A (en) | 1996-09-11 |
Family
ID=11369414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95190671.2A Pending CN1130965A (en) | 1994-07-29 | 1995-07-21 | Optical modular control device for monitoring optical fiber cables |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1130965A (en) |
| IT (1) | IT1274680B (en) |
| WO (1) | WO1996004723A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769847A (en) * | 2017-11-15 | 2018-03-06 | 国网江苏省电力公司徐州供电公司 | Tandem type fiber optic cable monitor method and monitoring system based on light time division technique |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8906937D0 (en) * | 1989-03-28 | 1989-05-10 | Plessey Telecomm | Testing optical fibre links |
| US5253250A (en) * | 1991-12-31 | 1993-10-12 | Gte Laboratories Incorporated | Routing and switching of high-speed optical data with the header transmitted on a subcarrier frequency |
-
1994
- 1994-07-29 IT ITMI941659A patent/IT1274680B/en active IP Right Grant
-
1995
- 1995-07-21 WO PCT/IT1995/000125 patent/WO1996004723A1/en active Application Filing
- 1995-07-21 CN CN95190671.2A patent/CN1130965A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769847A (en) * | 2017-11-15 | 2018-03-06 | 国网江苏省电力公司徐州供电公司 | Tandem type fiber optic cable monitor method and monitoring system based on light time division technique |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1274680B (en) | 1997-07-24 |
| ITMI941659A1 (en) | 1996-01-29 |
| ITMI941659A0 (en) | 1994-07-29 |
| WO1996004723A1 (en) | 1996-02-15 |
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