CN101729151B - Optical transmission method, device and system - Google Patents
Optical transmission method, device and system Download PDFInfo
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- CN101729151B CN101729151B CN 200810167098 CN200810167098A CN101729151B CN 101729151 B CN101729151 B CN 101729151B CN 200810167098 CN200810167098 CN 200810167098 CN 200810167098 A CN200810167098 A CN 200810167098A CN 101729151 B CN101729151 B CN 101729151B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The invention discloses optical transmission method, device and system which belong to the field of communication. The method comprises the following steps of: receiving a detecting optical signal by a first optical fiber, amplifying the detecting optical signal and isolating an optical signal which is opposite to the direction of the detecting optical signal; coupling the amplified and isolated detecting optical signal to enter a second optical fiber; amplifying a back scattering optical signal of the detecting optical signal which is coupled into the second optical fiber, isolating an optical signal which is opposite to the direction of the back scattering optical signal and outputting the amplified and isolated back scattering optical signal. The device comprises a first amplifying isolation module, a coupling module and a second amplifying isolation module. The system comprises a land terminal station, an optical transmission device, the first optical fiber and the second optical fiber. The optical transmission method, device and system enable the land terminal station to be capable of monitoring the optical fiber in the receiving direction by an OTDR technology by changing the flow direction of the detecting optical signal.
Description
Technical field
The present invention relates to the communications field, particularly a kind of optical transmission method, device and system.
Background technology
Fast development along with information technology; The sea cable network coverage each big marine site, the whole world; Marine-cable light fiber communication system generally adopts close wavelength-division multiplex technology, and the traffic generally surpasses more than the Tbit/s, has become the important communication network of carrying important international telecommunication service.The extra large cable of sea cable, especially coastal waters shallow water area, except normal corrosion and aging, the destruction that also receives incidents such as seabottom geology activity, human fishing exploration behavior, marine creature bite.If deterioration or fault appear in circuit; The economic loss that then causes is very big; Therefore, in order to ensure carrying out smoothly of communication service, the benthic division of marine-cable light fiber communication system monitored damage the position with promptly and accurately sea, location cable and damaged condition has very important significance.
One of method of at present optical fiber being monitored is to utilize OTDR (Optical Time Domain Reflectometer; Optical time domain reflectometer) basic principle; Promptly in optical fiber, launch a detecting optical pulses signal; When light transmits, all can cause scattering along the every bit on the fiber lengths in optical fiber.At connector, mechanical splice, fracture or optical fiber termination place, can reflect.Scattered light and reverberation some can get back to OTDR along the optical fiber reverse transfer, received by the detector of OTDR instrument, change mentioned optical fiber property above can judging from the power of the light that received.
And the benthic division of marine-cable light fiber communication system generally is made up of extra large cable and optical repeater.Generally light signal is every constantly repeats through all will in optical repeater, being exaggerated after tens kilometers the extra large cable transmission by this way, and marine-cable light fiber communication system can stride across the Pacific Ocean, reaches up to ten thousand kilometers transmission range.
Marine-cable light fiber communication system is because its particularity, whole link can only do as a whole on land the end station measured, and not as the land optical fiber telecommunications system, can be at each section of striding independent measurement.Generally; Optical fiber in the cable of sea exists with paired mode; Concerning the end station, land of each marine-cable light fiber communication system, in pairs an optical fiber in the optical fiber is used to send the land end station of light signal to the opposite end, and another root optical fiber is used to receive the light signal of end station, the land transmission of opposite end.Equally, each seabed optical repeater also comprises paired optical signal amplifier generally speaking.
Two optical signal amplifiers are amplified in the light signal that transmits in the optical fiber separately respectively, and the transmission direction of two ways of optical signals is opposite.Because the principle of image intensifer restriction; Image intensifer need combine isolator to use generally speaking; The characteristic of isolator is very little to the attenuated optical signal of a direction passing through it; And very big to rightabout through its attenuated optical signal, thus guarantee that light signal is unidirectional amplification, and the light signal of reverse transfer is blocked.
In this case, when end station, land utilizes the optical fiber in the cable of OTDR instrument monitoring sea, can normal transmission along the OTDR detecting optical pulses of forward transmitted direction input optical fibre, and can in each optical repeater, be exaggerated equally.But the backscattering of detecting optical pulses signal or reflected light signal are blocked at the isolator place of each optical repeater, and reverse transfer is got back to end station, land again, thereby the OTDR instrument also can't receive reflected light signal.Therefore, in order in submarine cable systems, to use OTDR technical monitoring optical fiber, must solve the problem of back-scattering light reverse transfer.
In the prior art, when using OTDR technology detection optical fiber, survey the reverse transfer problem of the back-scattering light of light, in optical repeater, increased coupler, referring to Fig. 1 in order to solve.
For example when the monitoring downlink optical fiber, end station, land emission detection light signal in downlink optical fiber is surveyed light signal forward transmitted in downlink optical fiber, can be amplified and pass through isolator by optical repeater.It is unaffected when the detection light signal of forward transmitted is through coupler in the downlink optical fiber; Survey light signal the back-scattering light reverse transfer be divided into two parts when arriving coupler; A part is along the port reverse transfer that connects isolator; Be attenuated after arriving isolator, can not continue reverse transfer through isolator.Another part reverse transfer light signal is coupled to another port; This port links to each other with coupler above the uplink optical fibers; Be coupled in the uplink optical fibers and transmit, thereby the end station, land of transmission detectable signal can receive the back-scattering light of detectable signal in uplink optical fibers.
Land end station emission detection light signal in downlink optical fiber in the such scheme receives the backscattering light signal of surveying light signal in uplink optical fibers, this light signal has reflected the information of downlink optical fiber.Thereby this technical scheme can only let each end station, land monitor the optical fiber of sending direction, and can not monitor the optical fiber of receive direction.
Summary of the invention
In order to make end station, land can monitor the optical fiber of receive direction, the embodiment of the invention provides a kind of optical transmission method, device and system.Said technical scheme is following:
A kind of optical transmission method, said method comprises:
First optical fiber receives surveys light signal, said detection light signal is amplified, and isolation and said detection light signal light signal in the opposite direction;
Detection light signal after said amplification and the isolation is coupled in second optical fiber;
The said backscattering light signal that is coupled into the detection light signal in second optical fiber is amplified, and isolation and the opposite light signal of said back-scattering light sense, the backscattering light signal output with said amplification and after isolating then.
A kind of light transmitting device, said device comprises: first amplifies isolation module, coupling module and the second amplification isolation module;
Said first amplifies isolation module, and the detection light signal that is used for first optical fiber is received amplifies, and isolation and said detection light signal light signal in the opposite direction;
Said coupling module is used for being coupled into second optical fiber through the detection light signal behind the said first amplification isolation module;
Said second amplifies isolation module; Be used for and amplify through the backscattering light signal that coupling module is coupled into the detection light signal of second optical fiber; And isolation and the opposite light signal of said back-scattering light sense, the said backscattering light signal output after will isolating then.
A kind of optical transmission system, said system comprises: end station, land, light transmitting device, first optical fiber and second optical fiber;
End station, said land is used for also being used for receiving and monitoring the backscattering light signal of said second optical fiber to the said first optical fiber emission detection light signal;
Said light transmitting device is used for detection light signal with said first optical fiber and amplifies and isolate the back and be coupled into said second optical fiber; Also being used for backscattering light signal with the detection light signal that is coupled into said second optical fiber amplifies and isolates.
The beneficial effect of the technical scheme that the embodiment of the invention provides is: change the flow direction of surveying light signal through coupler, make end station, land can utilize the optical fiber of OTDR technical monitoring to receive direction.
Description of drawings
Fig. 1 is in order to solve the sketch map of the reverse transfer of astigmatic signal dorsad in the prior art;
Fig. 2 is the flow chart of the optical transmission method that provides of the embodiment of the invention 1;
Fig. 3 is the sketch map of the coupler that provides of the embodiment of the invention 1;
Fig. 4 is the sketch map of the detection light signal coupling process that provides of the embodiment of the invention 1;
Fig. 5 is a kind of light transmitting device structural representation that the embodiment of the invention 2 provides;
Fig. 6 is a kind of light transmitting device concrete structure sketch map that the embodiment of the invention 2 provides;
Fig. 7 is the another kind of light transmitting device concrete structure sketch map that the embodiment of the invention 2 provides;
Fig. 8 is a kind of optical transmission system structural representation that the embodiment of the invention 3 provides.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Referring to Fig. 2, the embodiment of the invention provides a kind of optical transmission method, changes the flow direction of surveying light signal through coupler, can make end station, land utilize the OTDR technology can monitor the optical fiber of receive direction.Present embodiment is with the optical fiber of first optical fiber as transmit direction, with the optical fiber of second optical fiber as receive direction.This method specifically comprises:
101: the first optical fiber receives surveys light signal, and said detection light signal is amplified, and isolates and this detection light signal light signal in the opposite direction.
Wherein, the detection light signal that receives can be that end station, land emits, and on first optical fiber, can adopt image intensifer to amplify, and isolates and this detection light signal light signal in the opposite direction through isolator.
102: will through amplification and isolate after the detection light signal be coupled in second optical fiber.
Wherein, adopt coupler to be coupled,, be the sketch map of coupler referring to Fig. 3.Survey light signal from port 2 inputs, be coupled into port one and port 3 by a certain percentage respectively.
Wherein, coupler has directivity.The directivity of coupler is meant between the port of the same side and can not communicates mutually; Be in the light signal that to intercouple between the port of both sides; For example can not communicate between port one among Fig. 3 and the port 3, light signal can intercouple between port one and port 2, port 3 and the port 2.For example, from the light signal of port one input can only be by a certain percentage (for example 9/10) be coupled into port 2 outputs, can not be coupled into port 3 outputs, the light signal that perhaps is coupled into port 3 is very faint, to such an extent as in application, can ignore fully.From the light signal of port 3 input also can only be by a certain percentage (for example 1/10) be coupled into port 2 outputs, can not be coupled into port one output, the light signal that perhaps is coupled into port one is very faint, to such an extent as in application, can ignore fully.Then be coupled into port one and port 3 outputs by a certain percentage respectively from the light signal of port 2 inputs, for example optical coupling inlet side mouth 1 output of 9/10 ratio, 1/10 optical coupling inlet side mouth 3 outputs.Under three kinds of input scenes, the ratio that luminous power is distributed has definite relation, and concerns constant.
Coupler is to exist in pairs, and promptly first optical fiber neutralizes all has coupler in second optical fiber, is respectively first coupler and second coupler, and wherein, first coupler is linked to each other by common port 3 with second coupler.
In the embodiment of the invention, referring to Fig. 4, the detection light signal that is transmitted in first optical fiber is coupled in second optical fiber through first coupler and second coupler.Detailed process is following:
The detection light signal that is transmitted in first optical fiber gets into from the port of first coupler 2, is coupled into the first coupler port one and port 3 by a certain percentage respectively;
The detection light signal of port one that is coupled into first coupler is along first Optical Fiber Transmission;
The detection light signal that is coupled into the port 3 of first coupler is exported from the port 2 of second coupler, is about to survey light signal and from first optical fiber, has been coupled in second optical fiber.
103: the backscattering light signal that will be coupled into the detection light signal in second optical fiber amplifies, and isolates the light signal opposite with this back-scattering light sense, the backscattering light signal output after will amplifying and isolate then.
End station, land just can be monitored second optical fiber according to this backscattering light signal after receiving this backscattering light signal.
Wherein, can adopt image intensifer that the backscattering light signal of this detection light signal is amplified, adopt isolator to isolate the light signal opposite with this back-scattering light sense.
Because light signal is every through all decaying after tens kilometers the extra large cable transmission; So every through all amplifying after tens kilometers the extra large cable transmission, constantly repeat by this way, like this; Marine-cable light fiber communication system can stride across the Pacific Ocean, reaches up to ten thousand kilometers transmission range.Simultaneously, because the restriction of the principle of image intensifer, image intensifer need combine isolator to use generally speaking.The characteristic of isolator is very little to the attenuated optical signal of a direction passing through it, and very big through its attenuated optical signal to rightabout, thereby guarantees that light signal is unidirectional amplification, and the light signal of reverse transfer is attenuated, and promptly is blocked.
Continue above-mentioned example,, survey port 2 outputs of light signal, be about to survey light signal and from first optical fiber, be coupled in second optical fiber, survey light signal then along the second optical fiber reverse transfer from second coupler still referring to Fig. 4.Because survey light signal and in second optical fiber, transmit this moment, so this part is surveyed the information that the backscattering light signal of light signal has just carried second optical fiber.Then, the backscattering light signal that is carrying the second optical fiber information is along the second optical fiber forward transmitted, i.e. the transmission direction of this backscattering light signal is identical with the direction of second optical fiber.This backscattering light signal is coupled into the port one and the port 3 of second coupler by a certain percentage after port 2 entering of second coupler;
This backscattering light signal that is coupled into the port 3 of second coupler is exported from the port 2 of first coupler, is attenuated.
The backscattering light signal of port one that is coupled into second coupler is along the second optical fiber forward transmitted, through after amplifying and isolating, exports to end station, land.
Wherein, will through amplification and isolate after the detection light signal be coupled into before second optical fiber, also comprise:
The light signal that receives is divided into detection light signal and professional light signal, should survey light signal and be coupled in said second optical fiber.
Concrete, can adopt signal processor that this light signal is carried out differentiating and processing, for example filtering, decay etc.When carrying out differentiating and processing with filtering, only allow the light signal of a certain CF to pass through, the light signal of other frequencies is blocked.Like this, only allow to survey light signal between the up-downgoing optical fiber and pass through, and do not allow professional light signal to pass through, so both can realize, avoid phase mutual interference between the professional light signal in the up-downgoing optical fiber again the fiber optic cable monitor function.When carrying out differentiating and processing with decay, survey light signal and professional light signal and all be attenuated, do not influence the professional light signal in second optical fiber to guarantee the professional light signal in first optical fiber.
The optical transmission method that the embodiment of the invention provides through changing the flow direction of surveying light signal, makes end station, land can utilize the optical fiber of OTDR technical monitoring to receive direction.
Referring to Fig. 5, the embodiment of the invention provides a kind of light transmitting device, changes the flow direction of surveying light signal through coupler, can make end station, land utilize the OTDR technology can monitor the optical fiber of receive direction.Present embodiment is with the optical fiber of first optical fiber as transmit direction, with the optical fiber of second optical fiber as receive direction.This device comprises: first amplifies isolation module 51, coupling module 52 and the second amplification isolation module 53;
Wherein, first amplifies isolation module 51, and the detection light signal that is used for end station, land is transmitted into first optical fiber amplifies, and isolates and this detection light signal light signal in the opposite direction;
Second amplifies isolation module 53; Be used for and amplify through the backscattering light signal that coupling module 52 is coupled into the detection light signal of second optical fiber; And isolate the light signal opposite with this back-scattering light sense, this backscattering light signal after will amplifying and isolate is then exported to this end station, land.
End station, land just can be monitored second optical fiber according to this backscattering light signal after receiving this backscattering light signal.
As shown in Figure 6, wherein, first amplifies isolation module 51 comprises: first image intensifer 501, first isolator 502;
Wherein, first image intensifer 501 is arranged in first optical fiber, and the detection light signal that is used for end station, land is transmitted into first optical fiber amplifies;
Wherein, coupling module 52 comprises: first coupler 503 and second coupler 504; First coupler 503 is linked to each other by common port 3 with second coupler 504;
Wherein, first coupler 503 is arranged in first optical fiber, is used for sending to second coupler 504 through the detection light signal behind the first amplification isolation module 51;
Referring to Fig. 3 among the embodiment 1, be the sketch map of coupler.Survey port 2 inputs of light, be coupled into port one and port 3 by a certain percentage respectively from coupler.
Wherein, coupler has directivity.The directivity of coupler is meant between the port of the same side and can not communicates mutually; Be in the light signal that to intercouple between the port of both sides; For example can not communicate between port one among Fig. 3 and the port 3, light signal can intercouple between port one and port 2, port 3 and the port 2.For example, from the light signal of port one input can only be by a certain percentage (for example 9/10) be coupled into port 2 outputs, can not be coupled into port 3 outputs, the light signal that perhaps is coupled into port 3 is very faint, to such an extent as in application, can ignore fully.From the light signal of port 3 input also can only be by a certain percentage (for example 1/10) be coupled into port 2 outputs, can not be coupled into port one output, the light signal that perhaps is coupled into port one is very faint, to such an extent as in application, can ignore fully.Then be coupled into port one and port 3 outputs by a certain percentage respectively from the light signal of port 2 inputs, for example optical coupling inlet side mouth 1 output of 9/10 ratio, 1/10 optical coupling inlet side mouth 3 outputs.Under three kinds of input scenes, the ratio that luminous power is distributed has definite relation, and concerns constant.
Wherein, second amplifies isolation module 53 and comprises: second image intensifer 505, second isolator 506;
Wherein, second image intensifer 505 is arranged in second optical fiber, is used for the backscattering light signal that is coupled into the detection light signal of second optical fiber through coupling module 52 is amplified;
Referring to Fig. 6, get into through the port 2 of the detection light signal after 502 isolation of first isolator from first coupler 503, be coupled into first coupler, 503 port ones and port 3 by a certain percentage respectively;
The detection light signal of port one that is coupled into first coupler 503 is along first Optical Fiber Transmission;
The detection light signal that is coupled into the port 3 of first coupler 503 is exported from the port 2 of second coupler 504, is about to survey light signal and has been coupled in second optical fiber, surveys light signal then along the second optical fiber reverse transfer.Because survey light signal and in second optical fiber, transmit this moment, so this part is surveyed the information that the backscattering light signal of light signal has just carried second optical fiber.Then, the backscattering light signal that is carrying the second optical fiber information is along the second optical fiber forward transmitted.This backscattering light signal that is carrying the second optical fiber information is coupled into the port one and the port 3 of second coupler 504 by a certain percentage after port 2 entering of second coupler 504;
This backscattering light signal that is coupled into the port 3 of second coupler 504 is exported from the port 2 of first coupler 503, when arriving first isolator 502, is attenuated by first isolator 502;
This backscattering light signal of port one that is coupled into second coupler 504 is along the second optical fiber forward transmitted; Second image intensifer 505 amplifies this backscattering light signal; Second isolator 506 is isolated the opposite light signal of back-scattering light sense after amplifying with second image intensifer 505, and the backscattering light signal that will pass through then behind amplifier and the isolator is exported to end station, land.
Wherein, because the restriction of the principle of image intensifer, image intensifer need combine isolator to use generally speaking.The characteristic of isolator is very little to the attenuated optical signal of a direction passing through it, and very big through its attenuated optical signal to rightabout, thereby guarantees that light signal is unidirectional amplification, and the light signal of reverse transfer is blocked.
For example; Detection light signal in first optical fiber is along the forward transmitted of first optical fiber, do not have decay during through first isolator 502 basically, and the backscattering light signal of port 3 that is coupled into second coupler 504 is from port 2 outputs of first coupler 503; When arriving first isolator 502; Owing to be reverse transfer, it is very big to decay, and is blocked basically.
Wherein, referring to Fig. 7, this device also comprises:
Wherein, signal processor 507 can be the device that optical filter, optical attenuator or other can be handled signal.When for example selecting optical filter for use, only tolerance frequency is that the light signal of a certain CF passes through, and the light signal of other frequency is blocked; Connection between the up-downgoing optical fiber only allows to survey light signal to be passed through, and does not allow professional light signal to pass through, and so both can realize the fiber optic cable monitor function, avoids phase mutual interference between the professional light signal in the up-downgoing optical fiber again.
When for example selecting optical attenuator for use, survey light signal and professional light signal and all be attenuated, do not influence the professional light signal in second optical fiber when guaranteeing that professional light signal in first optical fiber is through coupler.
In the embodiment of the invention, with the optical fiber of first optical fiber as transmit direction, in the practical application, also can be with the optical fiber of second optical fiber as the transmitting party line.Concrete change is obvious, repeats no more here.
The light transmitting device that the embodiment of the invention provides changes the flow direction of surveying light signal through coupler, makes end station, land can utilize the optical fiber of OTDR technical monitoring to receive direction.
Referring to Fig. 8, the embodiment of the invention provides a kind of optical transmission system, changes the flow direction of surveying light signal through light transmitting device, can make end station, land utilize the optical fiber of OTDR technical monitoring to receive direction.Present embodiment is with the optical fiber of first optical fiber as transmit direction, with the optical fiber of second optical fiber as receive direction.This system comprises: end station, land 701, light transmitting device 702, first optical fiber 703 and second optical fiber 704;
End station, land 701 is used for also being used for receiving and monitoring the backscattering light signal of second optical fiber 704 to first optical fiber, 703 emission detection light signals;
Light transmitting device 702 is used for the detection light signal that is transmitted into first optical fiber 703 is amplified, and isolates and this detection light signal light signal in the opposite direction, and the detection light signal after will amplifying and isolate is coupled into second optical fiber 704; Also be used for the backscattering light signal of the detection light signal that is coupled into second optical fiber 704 is amplified, and isolate the light signal opposite with this back-scattering light sense.
Wherein, light transmitting device 702 specifically comprises: light transmitting device comprises: first amplifies isolation module, coupling module and the second amplification isolation module;
First amplifies isolation module, and the detection light signal that is used for end station, land is transmitted into first optical fiber amplifies, and isolates and this detection light signal light signal in the opposite direction;
Coupling module is used for being coupled into second optical fiber through the detection light signal behind the first amplification isolation module;
Second amplifies isolation module; Be used for and amplify through the backscattering light signal that coupling module is coupled into the detection light signal of second optical fiber; And isolate the light signal opposite with this back-scattering light sense, will export to end station, said land through the backscattering light signal of the second amplification isolation module then.
Wherein, the first amplification isolation module specifically comprises: first image intensifer, first isolator;
First image intensifer, the detection light signal that is used for end station, land is transmitted into first optical fiber amplifies;
First isolator is used to isolate the detection light signal light signal in the opposite direction after amplifying with first image intensifer;
Coupling module specifically comprises: first coupler and second coupler;
First coupler is arranged in first optical fiber, is used for sending to second coupler through the detection light signal behind the first amplification isolation module;
Second coupler is arranged in second optical fiber, is used to receive the detection light signal that first coupler sends.
Second amplifies isolation module specifically comprises: second image intensifer, second isolator;
Second image intensifer is used for the backscattering light signal of the detection light signal that is coupled into second optical fiber through coupling module is amplified;
Second isolator is used to isolate the opposite light signal of back-scattering light sense after amplifying with second image intensifer, will export to end station, said land through the backscattering light signal behind second isolator then.
Wherein, this light transmitting device also comprises:
Signal processor is positioned at first coupler and the second coupler junction, is used for the light signal that receives from first coupler is divided into detection light signal and professional light signal, should survey light signal and send to second coupler.
The concrete structure of this light transmitting device is identical with light transmitting device among the embodiment 2, repeats no more here.
In the embodiment of the invention, with the optical fiber of first optical fiber as transmit direction, in the practical application, also can be with the optical fiber of second optical fiber as the transmitting party line.Concrete change is obvious, repeats no more here.
The optical transmission system that the embodiment of the invention provides changes the flow direction of surveying light signal through light transmitting device, makes end station, land can utilize the optical fiber of OTDR technical monitoring to receive direction.
Inventive embodiments can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in the hard disk of computer, buffer memory or the CD.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an optical transmission method is characterized in that, said method comprises:
First optical fiber receive to be surveyed light signal, and said detection light signal is amplified, and will pass through detection light signal after the amplification through first isolator, and said first isolator is isolated and said detection light signal light signal in the opposite direction;
To be coupled into through the detection light signal behind said first isolator in second optical fiber;
To amplify by the backscattering light signal that the said detection light signal that is coupled in second optical fiber is produced; And the backscattering light signal after will amplifying is through second isolator; Said second isolator is isolated and the opposite light signal of said back-scattering light sense, will export through the backscattering light signal behind said second isolator then.
2. method according to claim 1 is characterized in that, with said amplification and the detection light signal after isolating be coupled into before second optical fiber, also comprise:
The light signal that receives is divided into detection light signal and professional light signal, said detection light signal is coupled in said second optical fiber.
3. a light transmitting device is characterized in that, said device comprises: first image intensifer, first isolator, coupling module, second image intensifer and second isolator;
Said first image intensifer, the detection light signal that is used for first optical fiber is received amplifies, and the detection light signal after will amplifying is input to said first isolator;
Said first isolator is connected with said first image intensifer, is used to isolate and said detection light signal light signal in the opposite direction;
Said coupling module is used for being coupled into second optical fiber through the detection light signal behind said first isolator;
Said second image intensifer be used for the backscattering light signal that the detection light signal that is coupled into second optical fiber through coupling module is produced is amplified, and the backscattering light signal after will amplifying is input to said second isolator;
Said second isolator is connected with said second image intensifer, is used to isolate and the opposite light signal of said back-scattering light sense, and the backscattering light signal after its said amplification that receives is exported.
4. light transmitting device according to claim 3 is characterized in that, said coupling module comprises: first coupler and second coupler;
Said first coupler is arranged in first optical fiber, is used for sending to said second coupler through the detection light signal behind said first isolator;
Said second coupler is arranged in second optical fiber, is used to receive the said detection light signal that said first coupler sends.
5. light transmitting device according to claim 4 is characterized in that, said device also comprises:
Signal processor is positioned at said first coupler and the second coupler junction, is used for the light signal that receives from said first coupler is divided into detection light signal and professional light signal, and said detection light signal is sent to said second coupler.
6. an optical transmission system is characterized in that, said system comprises: end station, land, light transmitting device, first optical fiber and second optical fiber;
End station, said land is used for also being used for receiving and monitoring the backscattering light signal of said second optical fiber to the said first optical fiber emission detection light signal;
Said light transmitting device is used for detection light signal with said first optical fiber and amplifies and isolate the back and be coupled into said second optical fiber; Also be used for the backscattering light signal that is produced by the detection light signal that is coupled into said second optical fiber is amplified and isolates.
7. optical transmission system according to claim 6 is characterized in that, said light transmitting device comprises: first image intensifer, first isolator, coupling module, second image intensifer and second isolator;
Said first image intensifer, the detection light signal that is used for end station, land is transmitted into first optical fiber amplifies, and the detection light signal after will amplifying is input to said first isolator;
Said first isolator is connected with said first image intensifer, is used to isolate and said detection light signal light signal in the opposite direction
Said coupling module is used for being coupled into second optical fiber through the detection light signal behind said first isolator;
Said second image intensifer be used for the backscattering light signal that the detection light signal that is coupled into second optical fiber through coupling module is produced is amplified, and the backscattering light signal after will amplifying is input to said second isolator;
Said second isolator is connected with said second image intensifer, is used to isolate and the opposite light signal of said back-scattering light sense, and the backscattering light signal after its said amplification that receives is exported to end station, said land.
8. optical transmission system according to claim 7 is characterized in that, said coupling module specifically comprises: first coupler and second coupler;
Said first coupler is arranged in first optical fiber, is used for sending to said second coupler through the detection light signal behind said first isolator;
Said second coupler is arranged in second optical fiber, is used to receive the said detection light signal that said first coupler sends.
9. optical transmission system according to claim 8 is characterized in that, said light transmitting device also comprises:
Signal processor is positioned at said first coupler and the second coupler junction, is used for the light signal that receives from said first coupler is divided into detection light signal and professional light signal, and said detection light signal is sent to said second coupler.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810167098 CN101729151B (en) | 2008-10-10 | 2008-10-10 | Optical transmission method, device and system |
| PCT/CN2009/073703 WO2010040297A1 (en) | 2008-10-10 | 2009-09-02 | Method, device and system for optical transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810167098 CN101729151B (en) | 2008-10-10 | 2008-10-10 | Optical transmission method, device and system |
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| WO2020041931A1 (en) * | 2018-08-27 | 2020-03-05 | 华为海洋网络有限公司 | Submarine network device |
| CN112042135B (en) * | 2019-03-06 | 2022-07-29 | 华海通信技术有限公司 | Subsea network device and submarine cable system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2267781A1 (en) * | 1996-10-23 | 1998-04-30 | Tyco Submarine Systems Ltd. | Path to provide otdr measurements of an optical transmission system that includes optical isolators |
| EP0745293B1 (en) * | 1994-02-08 | 1999-09-08 | BRITISH TELECOMMUNICATIONS public limited company | Optical time domain reflectometry |
| CN101208884A (en) * | 2005-04-27 | 2008-06-25 | 红天系统公司 | COTDR arrangement for an undersea optical transmission system comprising multiple cable stations and multiple transmission segments |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6839169B2 (en) * | 2002-06-17 | 2005-01-04 | Agilent Technologies, Inc. | Optical apparatus and method for selectively transmitting optical signals |
| US20040047295A1 (en) * | 2002-08-20 | 2004-03-11 | Morreale Jay P. | Method and apparatus for providing a common optical line monitoring and service channel over an WDM optical transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0745293B1 (en) * | 1994-02-08 | 1999-09-08 | BRITISH TELECOMMUNICATIONS public limited company | Optical time domain reflectometry |
| CA2267781A1 (en) * | 1996-10-23 | 1998-04-30 | Tyco Submarine Systems Ltd. | Path to provide otdr measurements of an optical transmission system that includes optical isolators |
| CN101208884A (en) * | 2005-04-27 | 2008-06-25 | 红天系统公司 | COTDR arrangement for an undersea optical transmission system comprising multiple cable stations and multiple transmission segments |
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| WO2010040297A1 (en) | 2010-04-15 |
| CN101729151A (en) | 2010-06-09 |
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