CN104737472B - Optical-fiber network monitoring device, optical communication system and optical-fiber network monitoring method - Google Patents
Optical-fiber network monitoring device, optical communication system and optical-fiber network monitoring method Download PDFInfo
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- CN104737472B CN104737472B CN201380001314.7A CN201380001314A CN104737472B CN 104737472 B CN104737472 B CN 104737472B CN 201380001314 A CN201380001314 A CN 201380001314A CN 104737472 B CN104737472 B CN 104737472B
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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
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
Abstract
The invention discloses a kind of optical-fiber network monitoring device, optical communication system and optical-fiber network monitoring method, it is connected by light trunk passage with optical network unit, including：First transmitter, for launching the first optical signal along the first light path to optical network unit；First optical branching device, is arranged on the smooth trunk passage, in the reflected light signal that is reflected from the first optical signal through optical network unit, branching out the first reflected light signal, and the first reflected light signal is transmitted to the second light path；And first receiver, for receiving the first reflected light signal from the second light path.First reflected light signal is along the second optic path into receiver so that the Crosstalk returned by former first light path will not be entered in receiver, so as to reduce optical crosstalk.Meanwhile, transmitter and receiver need not be connected by optical branching device, make can have distance remote enough between transmitter and receiver, reduce the optical crosstalk and electrical crosstalk of equipment room.
Description
Technical field
The present invention relates to optical communication field, more particularly to a kind of optical-fiber network monitoring device, optical communication system and optical-fiber network prison
Survey method.
Background technology
With increasingly mature, GPON (the Gigabit-Capable Passive Optical of Fibre Optical Communication Technology
Network, Gigabit-capable Passive Optical Network) ripe/EPON (Ethernet PON, ethernet passive optical network) etc. PON system
Have begun to lay on a large scale, realize fiber to the home.Therefore the stabilization of EPON how is safeguarded, how to be carried out passive
The identification of optical network fault turns into the focus that current techniques are paid close attention to.
The universal means of industry are to use OTDR (Optical Time Domain Refletometer, optical time domain reflection
Instrument) to carry out fault detect and positioning to optical-fiber network.The general principle of optical time domain reflectometer is in fiber optic network using optical signal
Produced retroreflection during middle propagation, the optical signal of a certain wavelength is incided in fiber optic network, then by measuring correspondence
The size of reflected light signal energy embodies the situation of optical-fiber network.
Fig. 1 shows the structural representation of optical-fiber network monitoring device in the prior art, wherein, wavelength is descending for 1490nm's
Light carries OTDR test signals, and PON is entered from a paths after being reflected by TFF (Thin Flim Filter, film filtering slice)
In network, the reflected light signal formed in PON is returned to after a passages, then after the reflection of TFF filter plates, through undue
Road device enters d passages, is received by 1490nm receiver, data foundation is provided for the measurement of optical-fiber network.
Optical crosstalk is a key index for limiting OTDR test performances, in being PON due to OTDR test signals
Backreflected signals, this useful optical signal is usually quite weak, is easily influenceed by Crosstalk, and in 1490nm light sources
Part light can because it is various the reason for useful OTDR optical signals formation is disturbed, have influence on OTDR performance.
The content of the invention
In view of this, the present invention proposes a kind of optical-fiber network monitoring device, optical communication system and optical-fiber network monitoring method, to solve
Crosstalk certainly of the prior art along original optical path enter receiver in the problem of.
First aspect is connected there is provided a kind of optical-fiber network monitoring device by light trunk passage with optical network unit, bag
Include：
First transmitter, for launching the first optical signal along the first light path to the optical network unit；
First optical branching device, is arranged on the smooth trunk passage, for from first optical signal through the optical-fiber network
In the reflected light signal that unit is reflected, first reflected light signal is branched out, and first reflected light signal is passed
Transport to the second light path；And
First receiver, for receiving first reflected light signal from second light path.
With reference in a first aspect, there is provided a kind of optical-fiber network monitoring device, described in the first possible embodiment
One transmitter, first receiver and first optical branching device enter the transmission of traveling optical signal by waveguide.
With reference in a first aspect, in second of possible embodiment, first light path is specifically included：First wave guide with
Second waveguide,
The first transmitter connects the first wave guide, and the first wave guide is used to couple institute with the second waveguide
The first optical signal is stated to transmit to the optical network unit；
Second light path is specifically included：4th waveguide and the 5th waveguide,
First receiver connects the 5th waveguide, and the 4th waveguide is used to couple institute with the 5th waveguide
The first reflected light signal is stated to the first receiver coupled transfer；
One end of first optical branching device connects the 3rd waveguide as the smooth trunk passage, and
The other end of first optical branching device connects the second waveguide and for transmitting first reflected light respectively
4th waveguide of signal.
With reference to first aspect and the first of first aspect or second of possible embodiment, in the third possible implementation
In mode, described optical-fiber network monitoring device, in addition to：Wavelength division multiplexer, for coordinating first optical signal and described
The coupled transfer of one reflected light signal；The wavelength division multiplexer is mirror coating, diffraction grating or film filtering slice.
With reference to the possible embodiment of first three of first aspect, in the 4th kind of possible embodiment, the waveguide
It is pyramidal structure close to the end of the wavelength division multiplexer.
With reference to preceding four kinds of possible embodiments of first aspect, in the 5th kind of possible embodiment, the wavelength-division
Multiplexer is structure as a whole with the waveguide and first optical branching device.
First five with reference to first aspect plants possible embodiment, in the 6th kind of possible embodiment, the light net
Network monitoring device, in addition to：Processor, is connected with first receiver, for being monitored according to first reflected light signal
The working condition of the optical network unit.
The first six with reference to first aspect plants possible embodiment, in the 7th kind of possible embodiment, described light
Network monitor device, in addition to：
Second transmitter, for launching the second optical signal along the 3rd light path to the optical network unit；
First optical branching device, is additionally operable to the reflection reflected from second optical signal through the optical network unit
In optical signal, second reflected light signal is branched out, and second reflected light signal is transmitted to the 4th light path；
Second receiver, for receiving the second reflected light signal from the 4th light path；
The wavelength division multiplexer, is additionally operable to coordinate the coupling of second optical signal and second reflected light signal to pass
It is defeated.
The first seven with reference to first aspect plants possible embodiment, in the 8th kind of possible embodiment, described second
Transmitter, the second receiver, the first optical branching device and the wavelength division multiplexer enter the transmission of traveling optical signal by waveguide.
The first eight with reference to first aspect plants possible embodiment, in the 9th kind of possible embodiment, the described 3rd
Light path is specifically included：6th waveguide and the 4th waveguide,
The second transmitter connects the 6th waveguide, and the 6th waveguide is used to pass through the wavelength division multiplexer and institute
The 4th waveguide coupling is stated, second optical signal is transmitted to the optical network unit；
4th light path is specifically included：7th waveguide and the second waveguide,
Second receiver connects the 7th waveguide, and the 7th waveguide is used for by the wavelength division multiplexer and described the
Two waveguides are coupled, and second reflected light signal is transmitted to the second receiver.
With reference to preceding nine kinds of possible embodiments of first aspect, in the tenth kind of possible embodiment, described first
The optical signal and the power ratio of the optical signal exported to the 4th waveguide that optical branching device is exported to the second waveguide are 9: 1.
With reference to preceding ten kinds of possible embodiments of first aspect, in a kind of the tenth possible embodiment, in addition to：
Processor, is connected with first receiver and/or the second receiver, for according to first reflected light signal and/or
Two reflected light signals monitor the working condition of the optical network unit.
With reference to a kind of before first aspect ten possible embodiments, in the 12nd kind of possible embodiment, also wrap
Include：
3rd transmitter, for along first light path or the 3rd light path, to optical network unit transmitting with
First optical signal, threeth optical signal different with the wavelength of second optical signal；
First optical branching device, is additionally operable to the reflection reflected from the 3rd optical signal through the optical network unit
In optical signal, branch out the 3rd reflected light signal, and the 3rd reflected light signal transmitted to second light path or
4th light path；
First receiver or the second receiver are additionally operable to receive from second light path or the 4th light path
3rd reflected light signal；
The processor is additionally operable to monitor the working condition of the optical network unit according to the 3rd reflected light signal.
Second aspect is there is provided a kind of optical communication system, including optical line terminal and optical network unit, and the optical link is whole
End includes the optical-fiber network monitoring device described in claim any one of 1-13.
The third aspect is there is provided a kind of optical-fiber network monitoring method, and methods described is using described in claim any one of 1-6
Optical-fiber network monitoring device performs following step：
The first transmitter launches the first optical signal along the first light path to the optical network unit；
The reflected light signal that first optical branching device is reflected from first optical signal through the optical network unit
In, first reflected light signal is branched out, and first reflected light signal is transmitted to the second light path；And
First receiver receives first reflected light signal from second light path.
With reference to the third aspect, in the first possible embodiment, methods described is using the light net described in claim 7
Network monitoring device performs following step：
The processor monitors the working condition of optical network unit according to first reflected light signal.
With reference to the third aspect, and the third aspect the first or second of possible embodiment, it is possible at the third
In embodiment, methods described also includes performing following step using the optical-fiber network monitoring device described in claim 8：
The second transmitter launches the second optical signal along the 3rd light path to the optical network unit；
The reflected light signal that first optical branching device is reflected from second optical signal through the optical network unit
In, second reflected light signal is branched out, and second reflected light signal is transmitted to the 4th light path；And
Second receiver receives second reflected light signal from the 4th light path.
With reference to the possible embodiment of first three of the third aspect and the third aspect, in the 4th kind of possible embodiment
In, methods described performs following step using the optical-fiber network monitoring device described in claim 12：
The processor monitors the working condition of optical network unit according to second reflected light signal.
With reference to the third aspect and preceding four kinds of possible embodiments of the third aspect, in the 5th kind of possible embodiment
In, in addition to using the optical-fiber network monitoring device execution following step described in claim 13：
3rd transmitter is launched and institute along first light path or the 3rd light path to the optical network unit
State the wavelength of the first optical signal and the second optical signal different the 3rd optical signal；
The reflected light signal that first optical branching device is reflected from the 3rd optical signal through the optical network unit
In, the 3rd reflected light signal is branched out, and the 3rd reflected light signal is transmitted to second light path or described
Four light paths；
First receiver or the second receiver receive described the from second light path or the 4th light path
Three reflected light signals；And
The processor monitors the working condition of optical network unit according to the 3rd reflected light signal.
Optical-fiber network monitoring device, optical communication system and the optical-fiber network monitoring method provided according to embodiments of the present invention so that
Do not returned to by the Crosstalk of backtracking in receiver, reduce crosstalk, the light string compared to the -25dB before optimization or so
Disturb, the crosstalk reduction after being optimized using this programme to below -38dB；
Transmitter and receiver by optical branching device without being connected to waveguide, therefore the set location of transmitter and receiver
Between can have distance remote enough, the optical crosstalk and electrical crosstalk of equipment room can be reduced to greatest extent；
On the basis of crosstalk is reduced, the detection range of two kinds of wavelength or three kinds of wavelength is further covered, makes test
Ability is further lifted.
Only it is the light splitting of realizing two kinds of wavelength or three kinds of wavelength wavelength with an optical branching device, reduction optical-fiber network monitoring device
Size.
According to below with reference to the accompanying drawings becoming to detailed description of illustrative embodiments, further feature of the invention and aspect
It is clear.
Brief description of the drawings
Comprising in the description and constituting accompanying drawing and the specification of a part of specification and together illustrate the present invention's
Exemplary embodiment, feature and aspect, and for explaining the principle of the present invention.
Fig. 1 is the structural representation of optical-fiber network monitoring device in the prior art；
The structural representation for the optical-fiber network monitoring device that Fig. 2 provides for first embodiment of the invention；
The structural representation for the optical-fiber network monitoring device that Fig. 3 provides for second embodiment of the invention；
The structural representation for the optical-fiber network monitoring device that Fig. 4 provides for third embodiment of the invention；
The structural representation for the optical-fiber network monitoring device that Fig. 5 provides for fourth embodiment of the invention；
The structural representation for the optical communication system that Fig. 6 provides for fifth embodiment of the invention；
The flow chart for the optical-fiber network monitoring method that Fig. 7 provides for sixth embodiment of the invention；
The flow chart for the optical-fiber network monitoring method that Fig. 8 provides for seventh embodiment of the invention；
The flow chart for the optical-fiber network monitoring method that Fig. 9 provides for eighth embodiment of the invention.
Embodiment
Describe various exemplary embodiments, feature and the aspect of the present invention in detail below with reference to accompanying drawing.It is identical in accompanying drawing
Reference represent the same or analogous element of function.Although the various aspects of embodiment are shown in the drawings, remove
Non-specifically is pointed out, it is not necessary to accompanying drawing drawn to scale.
Special word " exemplary " is meant " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.In addition, in order to better illustrate the present invention,
Numerous details are given in following description.It will be appreciated by those skilled in the art that specific without these
Details, the present invention can equally be implemented.In other example, for known method, means, element and circuit not
It is described in detail, in order to highlight the purport of the present invention.
Embodiment 1
Fig. 2 shows the structural representation for the optical-fiber network monitoring device that first embodiment of the invention is provided.As shown in Fig. 2
The optical-fiber network monitoring device 100 includes first transmitter 101, the first receiver 102 and is arranged on network trunk optical passage
The first optical branching device 105.
Wherein：First transmitter 101 is used to launch the first optical signal, and first optical signal carries test optical signal
Downlink optical signal, first optical signal enters light trunk passage along the first light path, and enters optical-fiber network via light trunk passage
Unit.That is, optical-fiber network monitoring device 100 is connected by light trunk passage with optical network unit.First optical signal is passing through light
During trunk passage is transmitted to optical network unit, which part optical signal can be reflected back.First optical branching device 105 is set
Put on light trunk passage, for branching out first in the reflected light signal that is reflected from the first optical signal through optical network unit
Reflected light signal, and the first reflected light signal is transmitted to the second light path.First receiver 102, which is used to receive, comes from the second light path
The first reflected light signal.First receiver 102 regard the first reflected light signal received as a kind of optical signal to be monitored
Data foundation is provided for the monitoring work of optical-fiber network situation.
Wavelength can be used to believe for 1490nm optical signal as the first light for optical-fiber network monitoring device in the embodiment of the present invention
Number.
Further, the optical-fiber network monitoring device 100, can also include the processor being connected with the first receiver 102
106, the first reflected light signal that the processor 106 is used for receiving the first receiver 102 with default algorithm is carried out at data
Reason, then judges whether optical-fiber network state is stablized, and realizes effective monitoring to optical-fiber network.Due to the speed of optical signal in a fiber
Degree can be estimated, and reflective light intensity versus time curve namely correspond to change curve of the reflective light intensity with distance, therefore,
Processor 106 can judge what failure occurred in that at a distance more according to the change of reflective light intensity.For example measure one big
Energy of reflection light, it is meant that the problem of fibercuts may be occurred in that on the specific range；If measuring an energy to decline
Subtract, it is meant that the problem of fibre-optical bending may be occurred in that on the specific range, and then carry out malfunction elimination.
In a preferred embodiment, first transmitter 101, the first receiver 102 and the first optical branching device 105
Enter the transmission of traveling optical signal by waveguide.
Again as shown in Fig. 2 wherein, the first light path includes first wave guide d and second waveguide g.First transmitter 101 and first
Waveguide d connections, first wave guide d is coupled with second waveguide g, and the another of second waveguide g is connected to the first optical branching device 105, first
The connection second waveguide of optical branching device 105 g this one end is additionally coupled to the 4th waveguide f, and first the another of optical branching device 105 is connected to
3rd waveguide a, i.e. optical-fiber network monitoring device and optical network unit direct interaction light trunk passage.Second light path includes the 4th ripple
Lead f and the 5th waveguide e.4th waveguide f is coupled with the 5th waveguide e, and the another of the 5th waveguide e is connected to the first receiver 102.Its
In, the first optical signal that first transmitter 101 is launched is coupled to second waveguide g by first wave guide d, then passes through the first optical branching
Device 105 is coupled with the 3rd waveguide a, and enters optical network unit.First optical signal forms reflected light letter in optical network unit
Number and be reflected back the 3rd waveguide a, two parts are then branched into by the first optical branching device 105, second waveguide g and is had respectively entered
Four waveguide f, wherein, the reflected light signal for entering the 4th waveguide f is the first reflected light signal, and the first reflected light signal is coupled
To the 5th waveguide e, received through the 5th waveguide e by the first receiver 102, the first receiver 102 is by the first reflected light received
Signal provides data foundation as a kind of optical signal to be monitored for the monitoring work of optical-fiber network situation.
Optical-fiber network monitoring device provided in an embodiment of the present invention, will by the way that optical branching device is arranged on light trunk passage
First reflected light signal is along the second optic path into receiver so that the Crosstalk returned by former first light path will not enter
Into receiver, so as to reduce optical crosstalk, compared to the optical crosstalk of -25dB or so in the prior art, gone here and there using after this programme
Disturb and be reduced to below -38dB；Meanwhile, compared to prior art, transmitter and receiver in the present embodiment need not pass through light
Shunt is connected, and makes can have distance remote enough between transmitter and receiver, can be reduced to greatest extent between equipment
Optical crosstalk and electrical crosstalk.
Handled it is possible to further the end to each waveguide, the end that each waveguide and other waveguides are coupled
Make tapered, specific form is become larger along the non-end face of waveguide, and to increase the incident area of end face, optical signal enters
The face of penetrating can be adjusted according to actual needs, and then realize the reception of catering to incident optical signal, improve optical signal coupling efficiency.
It is designed it is possible to further the splitting ratio to first optical branching device 105, it is preferred that the first optical branching device
105 couple of the 4th waveguide f and second waveguide g branched power ratio is 1: 9.
Further, in a preferred embodiment, the optical-fiber network monitoring device 100, can also include wavelength division multiplexer,
Coupled transfer for coordinating the first optical signal and the first reflected light signal, the wavelength division multiplexer can be mirror coating, diffraction light
Grid or film filtering slice.
With further reference to Fig. 2, in an embodiment of the present invention, the wavelength division multiplexer can be a mirror coating 114, the first hair
Emitter 101, the first receiver 102 are placed in the reflective side (left side shown in Fig. 2) of mirror coating 114, and mirror coating 114 can be to light
Signal carries out the reflection and transmission of selectivity, to coordinate the coupled transfer of optical signal.The mirror coating 114 exports first wave guide d
The first optical signal reflected to optical-fiber network, coupled in second waveguide g, optical-fiber network is inputted by second waveguide g.Meanwhile, by the 4th
First reflected light signal of waveguide f transmission reflects and is coupled in the 5th waveguide e, is received by the first receiver 102.
In an embodiment of the present invention, the wavelength division multiplexer can be connected as one with each waveguide.In actually manufacture,
The coupled end of each waveguide and the wavelength division multiplexer can be subjected to rational matched design in advance, be adopted when processing respective waveguide
With identical technique machine-shaping, the wavelength division multiplexer is set to form fixed integrative-structure, this integrative-structure with each waveguide
With that compared with the mode of corresponding eyeglass is inserted into after waveguide is configured, the wavelength division multiplexer and matching of waveguide can be avoided bad
The problem of, and then ensure to obtain the accuracy of data, it is ensured that the monitoring accuracy of device.
Embodiment 2
Fig. 3 shows the structural representation for the optical-fiber network monitoring device that second embodiment of the invention is provided.As shown in figure 3,
The present embodiment and the difference of embodiment 1 are that optical-fiber network monitoring device 100 also includes the receiver of second transmitter 103 and second
104。
Wherein：Second transmitter 103 is used to launch the second optical signal along the 3rd light path to optical network unit.Surveyed
, it is necessary to temporarily interrupt regular traffic when trial work is made, the second optical signal is launched by the second transmitter 103, second optical signal is
Optical signal is tested, its wavelength can be identical with the uplink optical signal wavelength that optical network unit is transmitted to optical line terminal.This second
Optical signal enters optical network unit along the 3rd light path by light trunk passage.First optical branching device 105 is arranged on light trunk and led to
On road, the second reflected light letter is branched out in being additionally operable to the reflected light signal that is reflected from the second optical signal through optical network unit
Number, and the second reflected light signal is transmitted to the 4th light path.It is anti-that second receiver 104 is used for reception second from the 4th light path
Penetrate optical signal.First receiver 102 and the second receiver 104 are believed the reflected light signal received as a kind of light to be monitored
Number provide data foundation for the monitoring work of optical-fiber network situation.
Further, the optical-fiber network monitoring device 100, can also include a processor 106, respectively with the first receiver
102 and second receiver 104 connect, with the first reflected light signal received to the first receiver 102 using default algorithm, and
The second reflected light signal that second receiver 104 is received carries out data processing, then judges whether optical-fiber network state is stablized, real
Now to effective monitoring of optical-fiber network.
Wavelength can be used to believe for 1490nm optical signal as the first light for optical-fiber network monitoring device in the embodiment of the present invention
Number, wavelength is used as the second optical signal for 1310nm optical signal.
The optical-fiber network monitoring device uses PLC (Planar Light-wave Circuit, planar light signal wire road) four
To structure, the reflected light signal monitoring of the first optical signal and the second optical signal is combined, its test scope covers two kinds of wavelength,
Power of test is set to be lifted.
Specifically, first transmitter 101, the first receiver 102, second transmitter 103, the second receiver 104 and
First optical branching device 105 enters the input and output of traveling optical signal by waveguide.
Again as shown in figure 3, wherein, the first light path includes first wave guide d and second waveguide g, first transmitter 101 and first
Waveguide d connections, first wave guide d is coupled with second waveguide g, and the another of second waveguide g is connected to the first optical branching device 105, first
The connection second waveguide of optical branching device 105 g this one end is additionally coupled to the 4th waveguide f, and first the another of optical branching device 105 is connected to
3rd waveguide a, i.e. optical-fiber network monitoring device and optical network unit direct interaction light trunk passage.Second light path includes the 4th ripple
F and the 5th waveguide e are led, the 4th waveguide f is coupled with the 5th waveguide e, the another of the 5th waveguide e is connected to the first receiver 102.Enter
One step, the 3rd light path includes the 6th waveguide c and the 4th waveguide f.Second transmitter 103 is connected with the 6th waveguide c, the 6th waveguide
C is coupled with the 4th waveguide f.4th light path includes second waveguide g and the 7th waveguide b, and the second receiver 104 and the 7th waveguide b connect
Connect, the 7th waveguide b is coupled with second waveguide g.
Wherein, the first optical signal that first transmitter 101 is launched is coupled to second waveguide g by first wave guide d, then passes through
First optical branching device 105 is coupled with the 3rd waveguide a, and enters optical network unit.First optical signal shape in optical network unit
Into reflected light signal and the 3rd waveguide a is reflected back, two parts are then branched into by the first optical branching device 105, is had respectively entered
Two waveguide g and the 4th waveguide f, wherein, the reflected light signal for entering the 4th waveguide f is the first reflected light signal, the first reflection
Optical signal is coupled to the 5th waveguide e, is received through the 5th waveguide e by the first receiver 102, and the first receiver 102 will be received
The first reflected light signal as a kind of optical signal to be monitored, provide data foundation for the monitoring work of optical-fiber network situation.
Similarly, the second optical signal that second transmitter 103 is launched is coupled to the 4th waveguide f by the 6th waveguide c, then passes through
First optical branching device 105 is coupled with the 3rd waveguide a, and enters optical network unit.Second optical signal shape in optical network unit
Into reflected light signal and the 3rd waveguide a is reflected back, two parts are then branched into by the first optical branching device 105, two parts difference
Into the 4th waveguide f and second waveguide g, wherein, the optical signal for entering second waveguide g is the second reflected light signal, and second is anti-
Penetrate optical signal and be coupled to the 7th waveguide b, received through the 7th waveguide b by the second receiver 104.Second receiver 104 will be received
The second reflected light signal arrived provides data foundation as a kind of optical signal to be monitored for the monitoring work of optical-fiber network situation.
Optical-fiber network monitoring device provided in an embodiment of the present invention, will by the way that optical branching device is arranged on light trunk passage
First reflected light signal along second optic path different from the light path of original optical path first into receiver, so as to reduce light string
Disturb, the use of crosstalk reduction after this programme is below -38dB compared to -25dB of the prior art or so optical crosstalk.
Meanwhile, compared to prior art, transmitter and receiver in the present embodiment need not be connected by optical branching device,
So that there can be distance remote enough between transmitter and receiver, the optical crosstalk and electricity between equipment can be reduced to greatest extent
Crosstalk.
Secondly, light splitting is carried out to the optical signal of two wavelength of 1490nm and 1310nm using an optical branching device, simplified
The structure of optical-fiber network monitoring device.
Handled it is possible to further the end to each waveguide, the end that each waveguide and other waveguides are coupled
Make tapered, specific form is become larger along the non-end face of waveguide, and to increase the incident area of end face, optical signal enters
The face of penetrating can be adjusted as needed, and then realize the reception of catering to incident optical signal, improve optical signal coupling efficiency.
It is designed it is possible to further the splitting ratio to first optical branching device 105, it is preferred that the first optical branching device
105 couple of the 4th waveguide f and second waveguide g branched power ratio is 1: 9.
Further, in a preferred embodiment, the optical-fiber network monitoring device 100, can also include wavelength division multiplexer,
Coupled transfer for coordinating first, second optical signal and first, second reflected light signal, the wavelength division multiplexer can be plated film
Mirror, diffraction grating or film filtering slice.
With further reference to Fig. 3, in an embodiment of the present invention, the wavelength division multiplexer can be a mirror coating 114, the first hair
Emitter 101, the first receiver 102 are placed in the reflective side (left side shown in Fig. 2) of mirror coating 114, second transmitter 103 and
Two receivers 104 are placed in the transparent side of mirror coating 114 (right side shown in Fig. 2).Mirror coating 114 can be selected optical signal
The reflection and transmission of property, to coordinate the coupled transfer of optical signal.The first optical signal that the mirror coating 114 exports first wave guide d
Reflected to optical network unit, coupled in second waveguide g, optical network unit is inputted by second waveguide g.Meanwhile, by the 4th waveguide f
First reflected light signal of transmission reflects and is coupled in the 5th waveguide e, is received by the first receiver 102.Also, mirror coating
114 the second optical signals for also exporting the 6th waveguide c transmit and coupled to the 4th waveguide f, optical-fiber network are inputted by the 4th waveguide f
Unit, while by second waveguide g the second reflection light transmissions transmitted and coupled to the 7th waveguide b, is transmitted to the by the 7th waveguide b
Two receivers 104.
In an embodiment of the present invention, mirror coating 114 can also select to transmit using reflection 1310nm optical signals
The mode of 1490nm optical signals, as long as now by the position of the receiver 104 of first transmitter 101 and second, the second hair in device
The position of the receiver 102 of emitter 103 and first swaps round.In an embodiment of the present invention, do not limit yet transmitter with
Be arranged above and below position of the receiver in side.
Embodiment 3
Fig. 4 shows the structural representation for the optical-fiber network monitoring device that third embodiment of the invention is provided, as shown in figure 4,
The difference of the embodiment and above-described embodiment is that wavelength division multiplexer can also be a diffraction grating 116, is equally used for matching somebody with somebody closing light
The coupled transfer of signal, the first optical signal and the second optical signal is coupled in optical network unit, by the first reflected light signal coupling
The first receiver 102 is bonded to, the second reflected light signal is coupled to the second receiver 104.The first light exported from first wave guide d
Signal, is coupled to the 3rd waveguide a, through the 3rd waveguide a from the 6th waveguide c the second optical signals exported by diffraction grating 116
First, second reflected light signal of output is coupled in corresponding 5th waveguide e and the 7th waveguide b by diffraction grating 116.
In this case, each transmitter, receiver and waveguide can be arranged at the homonymy of diffraction grating 116, and then contracted to a certain extent
The length of short optical-fiber network monitoring device.The present embodiment does not limit transmitter and receiver is positioned on the left of diffraction grating or the right side
Side, the position that is arranged above and below of transmitter and receiver in side is not limited yet.
In alternatively possible implementation, wavelength division multiplexer can also have selectivity for TFF film filtering slices etc.
Transmitting and the device of transmission performance, for coordinating the coupled transfer of optical signal.
In an embodiment of the present invention, the wavelength division multiplexer can be connected as one with each waveguide.In actually manufacture,
The coupled end of each waveguide and the wavelength division multiplexer can be subjected to rational matched design in advance, be adopted when processing respective waveguide
With identical technique machine-shaping, the wavelength division multiplexer is set to form fixed integrative-structure, this integrative-structure with each waveguide
With that compared with the mode of corresponding eyeglass is inserted into after waveguide is configured, the wavelength division multiplexer and matching of waveguide can be avoided bad
The problem of, and then ensure to obtain the accuracy of data, it is ensured that the monitoring accuracy of device.
Embodiment 4
Fig. 5 shows the structural representation for the optical-fiber network monitoring device that fourth embodiment of the invention is provided, as shown in figure 5,
The difference of the embodiment of the present invention and above-described embodiment is, can also set up the 3rd transmitter 117, the 3rd transmitter 117 with
Second optical branching device 107 is connected, it is possible to be connected to by the second optical branching device 107 on first wave guide d.3rd transmitter 117
Send wavelength different the 3rd optical signal with above-mentioned first optical signal and the second optical signal, the 3rd optical signal is along first
Light path, is coupled to second waveguide g by first wave guide d, enters optical network unit by the 3rd waveguide a.
First optical branching device 105, in being additionally operable to the reflected light signal that is reflected from the 3rd optical signal through optical network unit,
The 3rd reflected light signal is branched out, and the 3rd reflected light signal is transmitted to the second light path, by the 4th waveguide f and the 5th ripple
E is led, is received by the first receiver 102.
Similarly, the 3rd transmitter 117 is connected with the second optical branching device 107, can also be connected by the second optical branching device 107
It is connected on the 6th waveguide c.3rd transmitter 117 sends the wavelength different with above-mentioned first optical signal and the second optical signal
Three optical signals, the 3rd optical signal can also be coupled to the 4th waveguide f, by the 3rd along the 3rd light path by the 6th waveguide c
Waveguide a enters optical network unit.
First optical branching device 105, can be also used for believing from the reflected light that the 3rd optical signal is reflected through optical network unit
In number, branch out the 3rd reflected light signal, and the 3rd reflected light signal transmitted to the 4th light path, by second waveguide g and
7th waveguide b, is received by the second receiver 104.
Processor 106, can be also used for carrying out data processing to the 3rd reflected light signal, then judges optical-fiber network state
Whether stablize, realize effective monitoring to optical-fiber network.
The wavelength of 3rd optical signal can rationally be set according to actual monitoring situation, can for 1650nm or
1625nm, it is also an option that other rational wavelength.
The present embodiment makes the power of test of the device further be lifted by increasing the third test optical signal.Also, can
To continue to increase other test wavelengths according to actual needs, further to expand monitoring range.
Embodiment 5
As shown in fig. 6, the structural representation of the optical communication system provided for fifth embodiment of the invention, the optical communication system
200 include optical line terminal and optical network unit, and the optical line terminal includes the optical-fiber network prison described in any of embodiment 1-4
Device 100 is surveyed, the optical network unit can be any optical network unit in the prior art.
The present embodiment is illustrated by taking built-in optical-fiber network monitoring device as an example, it will be appreciated by those skilled in the art that also may be used
To realize the optical communication system described in the present embodiment in the form of external optical-fiber network monitoring device.
Embodiment 6
As shown in fig. 7, the flow chart of the optical-fiber network monitoring method provided for sixth embodiment of the invention, this method includes：
Step S101, first transmitter 101 launches the first optical signal along the first light path to optical network unit；
Step S102, the reflected light signal that the first optical branching device 105 is reflected from the first optical signal through optical network unit
In, the first reflected light signal is branched out, and first reflected light signal is transmitted to the second light path；
Step S103, the first receiver 102 receives the first reflected light signal from the second light path, is the monitoring of optical-fiber network
Data foundation is provided.
In a kind of possible embodiment, this method can also include：
Step S104, the first reflected light signal that processor 106 is received according to the first receiver 102 monitors optical-fiber network list
The working condition of member.
The optical-fiber network monitoring device that monitoring method provided in an embodiment of the present invention can rely on the offer of above-described embodiment 1 is real
It is existing.The first optical signal is launched along the first light path to optical network unit by first transmitter, led to by being arranged at light trunk
In the first optical branching device on road, the reflected light signal reflected from the first optical signal through optical network unit, first is branched out
Reflected light signal, and the first reflected light signal is transmitted to the second light path, the from the second light path is received by the first receiver
One reflected light signal.Further, the working condition of optical network unit is monitored according to the first reflected light signal by processor.And
And, can coordinate the coupling and transmission into traveling optical signal by respective waveguide and mirror coating or diffraction grating, its detailed content with
It is identical described in embodiment 1.
The wavelength of the first optical signal in the present embodiment can be 1490nm.
The optical-fiber network monitoring method provided according to embodiments of the present invention, the first reflected light signal along the second optic path extremely
In receiver so that the Crosstalk returned by former first light path will not be entered in receiver, so as to reduce optical crosstalk.
Embodiment 7
As shown in figure 8, the flow chart of the optical-fiber network monitoring method provided for seventh embodiment of the invention, this method includes：
Step S201, first transmitter 101 launches the first optical signal, the second transmitting along the first light path to optical network unit
Device 103 launches the second optical signal along the 3rd light path to optical network unit；
Step S202, the reflected light signal that the first optical branching device 105 is reflected from the first optical signal through optical network unit
In, the first reflected light signal is branched out, and first reflected light signal is transmitted to the second light path；First optical branching device 105 is also
In the reflected light signal reflected from the second optical signal through optical network unit, branch out the second reflected light signal, and this
Two reflected light signals are transmitted to the 4th light path.
Step S203, the first receiver 102 receives the first reflected light signal from the second light path, the second receiver 104
The second reflected light signal from the 4th light path is received, data foundation is provided for the monitoring of optical-fiber network.
In a kind of possible embodiment, this method can also include：
Step S204, the reflected light signal that processor 106 is received according to the first receiver 102 and the second receiver 104
Monitor the working condition of optical network unit.
Monitoring method provided in an embodiment of the present invention can rely on the optical-fiber network monitoring device of above-described embodiment 2-3 offers
Realize.The first optical signal is launched along the first light path to optical network unit by first transmitter, by being arranged at light trunk
In the first optical branching device on passage, the reflected light signal reflected from the first optical signal through optical network unit, is branched out
One reflected light signal, and the first reflected light signal is transmitted to the second light path, received by the first receiver from the second light path
First reflected light signal；The second optical signal is launched along the 3rd light path to optical network unit by second transmitter simultaneously, passed through
It is arranged at the first optical branching device on light trunk passage, the reflected light signal reflected from the second optical signal through optical network unit
In, the second reflected light signal is branched out, and the second reflected light signal is transmitted to the 4th light path, received and come from by the second receiver
Second reflected light signal of the 4th light path.Light net is monitored according to the first reflected light signal and the second reflected light signal by processor
The working condition of network unit.And it is possible to coordinate the coupling into traveling optical signal by respective waveguide and mirror coating or diffraction grating
And transmit, its detailed content is identical with described in embodiment 2-3.
The wavelength of the first optical signal in the present embodiment can be 1490nm, and the wavelength of the second optical signal can be
1310nm。
The optical-fiber network monitoring method provided according to embodiments of the present invention, further by the first optical signal and the second optical signal
Reflected light signal monitoring is combined, and its test scope covers two kinds of wavelength, power of test is lifted.
Embodiment 8
As shown in figure 9, the flow chart of the optical-fiber network monitoring method provided for eighth embodiment of the invention, the embodiment with it is upper
The difference for stating embodiment 7 is that the monitoring method that the present embodiment is provided can also increase the testing procedure of the 3rd optical signal.Such as
Shown in Fig. 9, specifically, the optical-fiber network monitoring method also includes：
Step S205, the 3rd transmitter 117 is along the first light path or the 3rd light path, to optical network unit transmitting and the first light
The 3rd different optical signal of the wavelength of signal and the second optical signal；
Step S206, the reflected light signal that the first optical branching device 105 is reflected from the 3rd optical signal through optical network unit
In, the 3rd reflected light signal is branched out, and the 3rd reflected light signal is transmitted to the second light path or the 4th light path；
Step S207, the first receiver 102 or the second receiver 104 receive the 3rd from the second light path or the 4th light path
Reflected light signal provides data foundation for the monitoring of optical-fiber network.
The present embodiment relies on the optical-fiber network monitoring device of the offer of above-described embodiment 4, is believed by increasing the third test light
Number, the power of test of the device is further lifted.The wavelength of 3rd optical signal can be 1650nm or 1625nm, can be with
It is other rational wavelength.And the present embodiment can also test optical signal with actual network condition increase as needed, with
Further expand monitoring range, lift the stability of communication system.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (19)
1. a kind of optical-fiber network monitoring device, is connected by light trunk passage with optical network unit, it is characterised in that including：
First transmitter, for launching the first optical signal along the first light path to the optical network unit；
First optical branching device, is arranged on the smooth trunk passage, for from first optical signal through the optical network unit
In the reflected light signal reflected, the first reflected light signal is branched out, and first reflected light signal is transmitted to second
Light path；And
First receiver, for receiving first reflected light signal from second light path；
Wavelength division multiplexer, the coupled transfer for coordinating first optical signal and first reflected light signal；Wherein, wavelength-division
The first optical signal coupled transfer to the first optical branching device that multiplexer launches the first transmitter, by first optical branching
The first reflected light signal coupled transfer to the first receiver that device is branched out；
Wherein, first light path be first optical signal from the first transmitter outgoing, by the wavelength division multiplexer
Transmit to the first optical branching device paths traversed；
Second light path be first reflected light signal from the first optical branching device outgoing, by the wavelength division multiplexer
Transmit to the first receiver paths traversed.
2. optical-fiber network monitoring device according to claim 1, it is characterised in that：
The first transmitter, first receiver and first optical branching device enter the biography of traveling optical signal by waveguide
It is defeated.
3. optical-fiber network monitoring device according to claim 2, it is characterised in that：
First light path is specifically included：First wave guide and second waveguide,
The first transmitter connects the first wave guide, and the first wave guide is used to coupling with the second waveguide by described the
One optical signal is transmitted to the optical network unit；
Second light path is specifically included：4th waveguide and the 5th waveguide,
First receiver connects the 5th waveguide, and the 4th waveguide is used to coupling with the 5th waveguide by described the
One reflected light signal is to the first receiver coupled transfer；
One end of first optical branching device connects the 3rd waveguide as the smooth trunk passage, and
The other end of first optical branching device connects the second waveguide and for transmitting first reflected light signal respectively
The 4th waveguide.
4. optical-fiber network monitoring device according to claim 3, it is characterised in that also include：Wavelength division multiplexer, respectively with institute
State first wave guide, the second waveguide, the 4th waveguide and the 5th waveguide connection；The wavelength division multiplexer is plated film
Mirror, diffraction grating or film filtering slice.
5. optical-fiber network monitoring device according to claim 4, it is characterised in that：The waveguide is close to the wavelength division multiplexer
End be pyramidal structure.
6. optical-fiber network monitoring device according to claim 5, it is characterised in that：The wavelength division multiplexer and the waveguide and
First optical branching device is structure as a whole.
7. the optical-fiber network monitoring device according to any one of claim 1-6, it is characterised in that also include：
Processor, is connected with first receiver, for monitoring the optical network unit according to first reflected light signal
Working condition.
8. the optical-fiber network monitoring device according to any one of claim 4-6, it is characterised in that also include：
Second transmitter, for launching the second optical signal along the 3rd light path to the optical network unit；
First optical branching device, is additionally operable to believe from the reflected light that second optical signal is reflected through the optical network unit
In number, the second reflected light signal is branched out, and second reflected light signal is transmitted to the 4th light path；
Second receiver, for receiving the second reflected light signal from the 4th light path；
The wavelength division multiplexer, is additionally operable to coordinate the coupled transfer of second optical signal and second reflected light signal；
Wherein, the 3rd light path be second optical signal from the second transmitter outgoing, by the wavelength division multiplexer
Transmit to the first optical branching device paths traversed；
4th light path be second reflected light signal from the first optical branching device outgoing, by the wavelength division multiplexer
Transmit to the second receiver paths traversed.
9. optical-fiber network monitoring device according to claim 8, it is characterised in that：The second transmitter, the second receiver,
First optical branching device and the wavelength division multiplexer enter the transmission of traveling optical signal by waveguide.
10. optical-fiber network monitoring device according to claim 9, it is characterised in that：
3rd light path is specifically included：6th waveguide and the 4th waveguide,
The second transmitter connects the 6th waveguide, and the 6th waveguide is used for by the wavelength division multiplexer and described the
Four waveguides are coupled, and second optical signal is transmitted to the optical network unit；
4th light path is specifically included：7th waveguide and the second waveguide,
Second receiver connects the 7th waveguide, and the 7th waveguide is used for by the wavelength division multiplexer and second ripple
Coupling is led, second reflected light signal is transmitted to the second receiver.
11. optical-fiber network monitoring device according to claim 10, it is characterised in that：First optical branching device is to described
The optical signal and the power ratio of the optical signal exported to the 4th waveguide that two waveguides are exported are 9:1.
12. optical-fiber network monitoring device according to claim 11, it is characterised in that also include：
Processor, is connected with first receiver and/or the second receiver, for according to first reflected light signal and/
Or second reflected light signal monitor the working condition of the optical network unit.
13. optical-fiber network monitoring device according to claim 12, it is characterised in that also include：
3rd transmitter, for along first light path or the 3rd light path, to optical network unit transmitting with it is described
First optical signal, threeth optical signal different with the wavelength of second optical signal；
First optical branching device, is additionally operable to believe from the reflected light that the 3rd optical signal is reflected through the optical network unit
In number, the 3rd reflected light signal is branched out, and the 3rd reflected light signal is transmitted to second light path or the described 4th
Light path；
First receiver or the second receiver are additionally operable to receive from described in second light path or the 4th light path
3rd reflected light signal；And
The processor is additionally operable to monitor the working condition of the optical network unit according to the 3rd reflected light signal.
14. a kind of optical communication system, including optical line terminal and optical network unit, it is characterised in that the optical line terminal bag
Include the optical-fiber network monitoring device any one of claim 1-13.
15. a kind of optical-fiber network monitoring method, it is characterised in that methods described is using the light any one of claim 1-6
Network monitor device performs following step：
The first transmitter launches the first optical signal along the first light path to the optical network unit；
In the reflected light signal that first optical branching device is reflected from first optical signal through the optical network unit, point
First reflected light signal is paid, and first reflected light signal is transmitted to the second light path；And
First receiver receives first reflected light signal from second light path；
Wavelength division multiplexer coordinates the coupled transfer of first optical signal and first reflected light signal；Wherein, wavelength-division multiplex
The first optical signal coupled transfer to the first optical branching device that device launches the first transmitter, by first optical branching device point
The first reflected light signal coupled transfer to the first receiver of expenditure；
Wherein, first light path be first optical signal from the first transmitter outgoing, by the wavelength division multiplexer
Transmit to the first optical branching device paths traversed；
Second light path be first reflected light signal from the first optical branching device outgoing, by the wavelength division multiplexer
Transmit to the first receiver paths traversed.
16. optical-fiber network monitoring method according to claim 15, it is characterised in that the optical-fiber network monitoring device also includes
Processor, is connected with first receiver；
The processor monitors the working condition of optical network unit according to first reflected light signal.
17. optical-fiber network monitoring method according to claim 15, it is characterised in that the optical-fiber network monitoring device also includes
Second transmitter and the second receiver；
The second transmitter launches the second optical signal along the 3rd light path to the optical network unit；
In the reflected light signal that first optical branching device is reflected from second optical signal through the optical network unit, point
The second reflected light signal is paid, and second reflected light signal is transmitted to the 4th light path；And
Second receiver receives second reflected light signal from the 4th light path；
Wherein, the 3rd light path be second optical signal from the second transmitter outgoing, by the wavelength division multiplexer
Transmit to the first optical branching device paths traversed；
4th light path be second reflected light signal from the first optical branching device outgoing, by the wavelength division multiplexer
Transmit to the second receiver paths traversed.
18. optical-fiber network monitoring method according to claim 17, it is characterised in that the optical-fiber network monitoring device also includes
Processor, is connected with first receiver and/or the second receiver；
The processor monitors the working condition of optical network unit according to second reflected light signal.
19. optical-fiber network monitoring method according to claim 18, it is characterised in that the optical-fiber network monitoring device also includes
3rd transmitter；
3rd transmitter is along first light path or the 3rd light path to optical network unit transmitting and described the
The wavelength of one optical signal and the second optical signal different the 3rd optical signal；
In the reflected light signal that first optical branching device is reflected from the 3rd optical signal through the optical network unit, point
The 3rd reflected light signal is paid, and the 3rd reflected light signal is transmitted to second light path or the 4th light path；
It is anti-that first receiver or the second receiver receive the from second light path or the 4th light path the described 3rd
Penetrate optical signal；And
The processor monitors the working condition of optical network unit according to the 3rd reflected light signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2013/082200 WO2015024259A1 (en) | 2013-08-23 | 2013-08-23 | Optical network monitoring apparatus, optical communications system, and optical network monitoring method |
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| CN104737472B true CN104737472B (en) | 2017-10-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136867A (en) * | 2010-12-22 | 2011-07-27 | 华为技术有限公司 | Method, device and system for detecting branch optical fiber |
| CN102882596A (en) * | 2012-09-24 | 2013-01-16 | 华为技术有限公司 | Optical component, operating method thereof and passive optical network equipment |
| CN102971974A (en) * | 2012-03-07 | 2013-03-13 | 华为技术有限公司 | Single-fiber bi-directional optical module and passive optical network system |
Family Cites Families (3)
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| CN101043272A (en) * | 2006-06-08 | 2007-09-26 | 华为技术有限公司 | System and method for detecting optical fiber wiring troubles |
| WO2009129647A1 (en) * | 2008-04-21 | 2009-10-29 | Oplink Communications, Inc. | Fiber network monitoring |
| CN201878147U (en) * | 2010-08-25 | 2011-06-22 | 浙江万马集团电子有限公司 | Passive optical network (PON) access network optical cable fault on-line monitor |
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2013
- 2013-08-23 WO PCT/CN2013/082200 patent/WO2015024259A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136867A (en) * | 2010-12-22 | 2011-07-27 | 华为技术有限公司 | Method, device and system for detecting branch optical fiber |
| CN102971974A (en) * | 2012-03-07 | 2013-03-13 | 华为技术有限公司 | Single-fiber bi-directional optical module and passive optical network system |
| CN102882596A (en) * | 2012-09-24 | 2013-01-16 | 华为技术有限公司 | Optical component, operating method thereof and passive optical network equipment |
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