CN1338620A - Method and device for monitoring signal transmission in optical transmission system - Google Patents
Method and device for monitoring signal transmission in optical transmission system Download PDFInfo
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- CN1338620A CN1338620A CN00124285A CN00124285A CN1338620A CN 1338620 A CN1338620 A CN 1338620A CN 00124285 A CN00124285 A CN 00124285A CN 00124285 A CN00124285 A CN 00124285A CN 1338620 A CN1338620 A CN 1338620A
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Abstract
A method and device for monitoring the signal transmission in optical transmission system to transmit at least one communication signal is disclosed. A splitting coupler is used to sample said communication signal and use it as the monitored signal, which is then converted to electric signal and amplified for monitoring the variatino of said communication signal. After the varied value is compared with a reference, it can be determined that if an alarm signal is generated.
Description
The present invention relates to the detection of light signal, more particularly, relate to a kind of method and device of in use monitoring its signal transmission for optical transmission system.
Communication system generally includes the receiving end of the transmitting terminal that sends signal, received signal and between using the transmission medium that transmits signal between the two, i.e. communication channel, and be that soft, the hardware facility of realizing this purpose is collectively referred to as transmission system prevailingly.The bandwidth constraints of channel the speed of transmission information between transmitting terminal and the receiving end, therefore, the transmission medium of seeking to have bigger bandwidth just belongs to one of main direction of mechanics of communication development.Optical fiber and optical waveguide replace traditional cable gradually and become the communication transmission media of being liked in recent years.Optical fiber can provide the bandwidth far above coaxial wire, makes transfer rate be promoted significantly, and only optical fiber communication still has the many difficulties that can't get rid of.Because the decay in fiber middle light signal when transmission, and from optical fiber when laying or the fault that may cause of the environmental factor after laying, transmission quality that therefore must measuring fiber.Especially its transmission quality is more necessary in backbone optical cable guarantees.Use optical fiber in transmission system, one of subject matter that it faced is that optical fiber is tested, to detect and definite its trouble spot.
Optical time domain reflectometer (Optical Time Domain Reflectometer; OTDR) be widely used for measuring and positioning optical waveguides in the trouble spot, its principle of operation is with in the very brief light pulse injection fibre, and according to attenuation characteristic and the making-breaking point of the light signal that from optical fiber, reflects owing to Rayleigh scattering to tracking (trace) the decision optical fiber of time.For the location of trouble spot in the middle of simple point-to-point link (link), OTDR is a very valuable diagnostic tool, yet for the optical transmission system in the running, OTDR but is difficult to be suitable for.Cost an arm and a leg and be first shortcoming of OTDR.Because the attenuation characteristic of optical fiber itself and the degree of accuracy of measurement, the distance that OTDR can measure is limited, and will use OTDR to measure at each transmitting terminal of optical transmission system regularly, and is quite expensive.The disadvantage of OTDR is that it can't provide immediately monitoring.Must make optical transmission system shut down (out of service) when using OTDR to measure; or use the wavelength different to measure with the light signal that is transmitted; increase the complexity of system thus; and every test single optical fibre needs several minutes; and often comprise tens of cores to hundreds of cores or more optical fiber in an optical cable, so the time that is spent is quite long.Another shortcoming is to use OTDR may influence former transmission signals with in the light pulse injection fibre.And many transmission systems also are not suitable for using OTDR, when for example containing optoisolator or light shunt (optical branch) in the transmission path, rely on OTDR fully and will cause the monitoring fault of optical transmission system and be difficult for eliminating.
Therefore, the method for a kind of at-once monitor optical transmission system signal transmission and device just become be badly in need of.
Therefore, purpose of the present invention promptly is to provide a kind of instant and cheap monitoring method and device, in use monitors its signal transmission for optical transmission system.
One of purpose of the present invention also is to provide a kind of method and device of hyperchannel monitoring optical transmission system.
According to the present invention, a kind of method and device of monitor optical transmission system signal transmission, it utilizes a light splitting coupler (coupler) to take out a part as pilot signal from the communication signal (traffic signal) of optical transmission system, and through conversion and amplify and become electric signal, variation for communication signal in the at-once monitor optical transmission system, compare according to its variable quantity and the reference value of presetting, whether decision produces warning message again.
One of feature of the present invention is, monitored optical transmission system does not need to shut down just and can be subjected to instant monitoring.
Another feature of the present invention is to monitor a plurality of communication signals in multichannel mode.
Another being characterized as of the present invention must expensive monitoring equipment.
Of the present inventionly one be characterized as again, needn't present extra signal and enter in the monitored optical transmission system.
According to the present invention, instant and signals a plurality of communication signals transmit monitored.
For the person skilled in the art of this area, from the detailed description of doing below in conjunction with accompanying drawing, can more be expressly understood the present invention, its above-mentioned and other purpose and advantage will become more apparent.Wherein:
Fig. 1 is for according to supervising device of the present invention and be subjected to the fibre-optic transmission system (FOTS) synoptic diagram of its monitoring, in order to principle of the present invention to be described;
Fig. 2 provides a functional-block diagram, in order to explanation operations according to the instant invention process;
Fig. 3 provides the functional-block diagram of another embodiment;
Fig. 4 provides the synoptic diagram of another embodiment, shows the situation of monitoring an optical cable transmitting optical signal in multichannel mode;
Fig. 5 is the synoptic diagram of an embodiment of the light splitting coupler inside of expression system shown in Figure 4 use;
Fig. 6 adopts the synoptic diagram of the alarm monitor inside of time division multiplexing mode for expression one.
Fig. 1 is for according to supervising device of the present invention and be subjected to the fibre-optic transmission system (FOTS) synoptic diagram of its monitoring, in order to principle of the present invention to be described.As shown in FIG., in this fibre-optic transmission system (FOTS), transmit a communication signal S by means of optical fiber 30 with the form of light signal between the transmitting terminal 10 of a fiber optic and the receiving end 20
TFor monitoring the signal transmission in this transmission system, from communication signal S
TTake out a pilot signal S
M, promptly utilize a light splitting coupler 40 from communication signal S
TIn isolate a part, be about communication signal S
T1% to 5% between, as pilot signal S
MIsolating a part of light signal from an optical fiber is known technology, for example utilize fused fiber splice to be produced on optical branching device or grating on the special substrate, or all can finish by the optical waveguide that piezoelectric forms, it is known for the personnel that are familiar with this technical field.Pilot signal S
MBe sent to an alarm monitor 60 by another optical fiber 50 and carry out signal Processing, and have the pilot signal S of light signal form herein
MBe utilized the electric signal that photodetector and signal processing circuit are converted to digital form.And provide a computer 70 to connect alarm monitor 60 with bus-bar interface 72 such as RS-232 or general-purpose bus-bar (USB), so that give computer 70 with the form of digital signal with the data transmission that alarm monitor 60 produces from alarm monitor 60, and the variation of communication signal ST is analyzed and judged, preferably the result who analyzes according to computer 70 determines whether to produce warning message.
Fig. 2 provides a functional block diagram, in order to the process of its operation to be described.The inside of alarm monitor 60 comprises a photodetector 62, monitored signal S
MProduce electric signal by its detection, after being amplified through amplifier 64, in the treatment circuit 66 that includes analog-digital converter, be converted into the voltage signal of digital form, be sent to computer 70 from medium 72; The latter comprises a CPU (central processing unit) (CPU) 74, obtains the data of sending here from alarm monitor 60 via an impact damper 76, and these data comprise expression pilot signal S
MLuminous power or the data of light intensity size.Because pilot signal S
MBe from communication signal S
TIn an isolated part, therefore, observe pilot signal S
MVariation can learn communication signal S
TVariation.The inside of computer 70 comprises that also a storer 78 provides a reference value S
RGive CPU (central processing unit) 74, CPU (central processing unit) 74 is analyzed the pilot signal S that sends here from alarm monitor 60
MOptical power change, and reference value S therewith
RCompare, as pilot signal S
MThe variable quantity of luminous power exceed this reference value S
RThe time, just start alert program, confirm and the eliminating operation by the trouble spot of carrying out in the optical transmission system.Reference value S
RBe allowable range, compare also and then the basis of judging that it also can do dynamically adjustment according to the condition of transmission system, make this method for supervising and device have adaptability as CPU (central processing unit) 74 according to the default optical power change amount of optical transmission system.
Fig. 3 provides the functional-block diagram of another embodiment.As pilot signal S
MDetected by photodetector 62 and after amplifier 64 amplifies, utilize a resistance R to be converted into voltage signal and deliver to a comparer 68 with reference value S
RCompare.If pilot signal S
MExceed normal range, then comparer 68 produces trigger pips and delivers to treatment circuit 66, sends instruction and/or data to computer 70 from interface 72 again.Reference value S
RSignal system produce and offer comparer 68 by treatment circuit 66, the pilot signal S that its expression is default
M(or communication signal S
T) permissible minimum, in case just started alert program by being broken by a fall.Different with last embodiment is that analysis herein and judgement can realize with hardware in alarm monitor 60, but not utilize the software program in the computer 70 to realize.In this embodiment, computer 70 is responsible for the operation of monitoring record and alert program, and can issue an order to treatment circuit 66 via interface 72, and dynamically adjusts reference value S
R
Embodiment shown in Figure 3 can make local modification, for example detects pilot signal S earlier
MVariable quantity, send into comparer again and compare, only the reference value S of this moment
RBe the default pilot signal S of expression
MThe allowable range of variable quantity.
Often comprise tens of cores to hundreds of cores or more optical fiber in an optical cable, Fig. 4 provides the synoptic diagram of another embodiment, shows the situation of monitoring an optical cable transmitting optical signal in multichannel mode.Between transmitting terminal 10 and receiving end 20 optical cable 30 that contains multi-core fiber, N communication signal S of transmission on it
T(N).One light splitting coupler group 40 is therefrom taken out N pilot signal S
M(N), each pilot signal S
M(i) be a communication signal S
T(i) 1% to 5% between, wherein i represents from 1 to N natural number.Each pilot signal S
M(i) be sent to alarm monitor 60 by a corresponding optical fiber 50, the monitoring of signal transmission thereafter, analysis and judgement are described as the embodiment of front, no longer repeat herein, only in this embodiment, each pilot signal S
M(i) be given a corresponding reference value S
R(i), latter system reaches the wherein communication signal S of transmission according to its optical fiber of monitoring
T(i) characteristic and deciding, same, reference value S
R(N) can dynamically be adjusted.Therefore present embodiment can be monitored multi-core fiber simultaneously in multichannel mode, and this is that prior art institute is inaccessiable.
Fig. 5 is the synoptic diagram of an embodiment of light splitting coupler group 40 inside.As communication signal S
T(N) enter light splitting coupler group 40 from optical cable 30 after, it is isolated a part one to one by light splitting coupler BP1 to BPn and sends and become N monitored signal S
M(N).In different embodiment, utilize the grating that is produced on the special substrate can take out monitored signal S one by one
M(N).These all are that the personnel that are familiar with this technical field understand.
A kind of alarm monitor 60 of time division multiplexing mode that adopts is illustrated among Fig. 6 simply.Embodiment is described as the front, N pilot signal S
M(N) used photodetector to detect one to one and amplify and be converted to voltage signal and numerical data after, send into a N to one multiplexer 80, one electronic circuit switch SW sends them to the treatment circuit 82 that includes analog-digital converter in order, and is converted to suitable coded format and delivers to computer 70 from interface 72 and analyze and judge.
According to previous embodiment, instant and signal transmission of monitoring multi-core fiber is done, and use when of the present invention, and optical transmission system does not need shutdown; And element used in the present invention or equipment all belong to prior art, and is with low cost.
More than the description done for most preferred embodiment of the present invention be the purpose of illustrating, and unintentionally it is defined as content of the present invention and disclosed concrete form.Based on above instruction or by reading embodiments of the invention it to be modified or changes be possible, it is included that all such modifications and variation all should be considered as principle of the present invention, and technological thought of the present invention is then limited by following claims and equivalent thereof.
Claims (18)
1. one kind is the method that optical transmission system is in use monitored its signal transmission, and this optical transmission system transmits a communication signal, and this method comprises the following steps:
From this communication signal, take out a pilot signal; And
Observe the variation of this pilot signal so that be this optical transmission system generation warning message.
2. the method for claim 1, wherein this pilot signal system utilizes a light splitting coupler to tell certain proportion from this communication signal.
3. method as claimed in claim 2, wherein this ratio is between 1% to 5%.
4. the method for claim 1 further comprises and this pilot signal amplified and is converted into digital voltage signal and digital data form.
5. the method for claim 1 further comprises relatively this pilot signal and a reference value.
6. method as claimed in claim 5 wherein also comprises this reference value of dynamic adjustment.
7. the method for claim 1, wherein the variation of this pilot signal system draws from the luminous power of this pilot signal.
8. one kind is the method that optical transmission system is in use monitored its signal transmission, and this optical transmission system transmits many communication signals, and this method comprises the following steps:
From these many communication signals, take out corresponding many pilot signals; And
Observe the variation of these many pilot signals so that be this optical transmission system generation warning message.
9. method as claimed in claim 8 is wherein observed the time division multiplexing ground that is changed to of these many pilot signals these many communication signals is observed.
10. method as claimed in claim 8 is wherein observed being changed to concurrently of these many pilot signals these many communication signals is observed.
11. method as claimed in claim 8 further comprises relatively these many pilot signals reference value corresponding with it.
12. one kind is optical transmission system and in use monitors the device that its signal transmits, this optical transmission system transmits at least one communication signal, and this device comprises:
From this at least one communication signal, take out the device of a pilot signal; And
Observe the variation of this pilot signal so that produce the device of warning message for this optical transmission system.
13. device as claimed in claim 12 further comprises the device that this pilot signal is amplified and is converted into digital voltage signal and digital data form.
14. device as claimed in claim 12 further comprises the device of the luminous power that derives this pilot signal.
15. device as claimed in claim 12 further comprises the device that this pilot signal is observed on time division multiplexing ground.
16. device as claimed in claim 12 further comprises the device that takes out this pilot signal concurrently from this at least one communication signal.
17. device as claimed in claim 12 further comprises the relatively device of this pilot signal and a reference value.
18. device as claimed in claim 17 further comprises the device of dynamically adjusting this reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00124285A CN1338620A (en) | 2000-08-23 | 2000-08-23 | Method and device for monitoring signal transmission in optical transmission system |
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|---|---|---|---|
| CN00124285A CN1338620A (en) | 2000-08-23 | 2000-08-23 | Method and device for monitoring signal transmission in optical transmission system |
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| CN00124285A Pending CN1338620A (en) | 2000-08-23 | 2000-08-23 | Method and device for monitoring signal transmission in optical transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040309A (en) * | 2017-05-09 | 2017-08-11 | 南京南瑞继保电气有限公司 | A kind of fiber optic communication chain rupture quick monitoring method based on physical layer |
| CN108447227A (en) * | 2018-03-07 | 2018-08-24 | 天津大学 | A kind of interior is unexpected to fall intelligent alarm platform and its detection method |
-
2000
- 2000-08-23 CN CN00124285A patent/CN1338620A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040309A (en) * | 2017-05-09 | 2017-08-11 | 南京南瑞继保电气有限公司 | A kind of fiber optic communication chain rupture quick monitoring method based on physical layer |
| CN107040309B (en) * | 2017-05-09 | 2020-07-28 | 南京南瑞继保电气有限公司 | Optical fiber communication broken link rapid monitoring method based on physical layer |
| CN108447227A (en) * | 2018-03-07 | 2018-08-24 | 天津大学 | A kind of interior is unexpected to fall intelligent alarm platform and its detection method |
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