CN205912059U - Light relaying enlargies optical structure of optical fiber link transmission COTDR signal - Google Patents
Light relaying enlargies optical structure of optical fiber link transmission COTDR signal Download PDFInfo
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- CN205912059U CN205912059U CN201620705222.8U CN201620705222U CN205912059U CN 205912059 U CN205912059 U CN 205912059U CN 201620705222 U CN201620705222 U CN 201620705222U CN 205912059 U CN205912059 U CN 205912059U
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Abstract
The utility model relates to a light relaying enlargies optical structure of optical fiber link transmission COTDR signal respectively has the n level relay amplifier of mutual correspondence on A -> B optic fibre and A <- B optic fibre, equal optical structure of one set of transmission A end COTDR signal of cooperation installation, including circulator, fiber coupler, separate wavelength division multiplexer and wavelength division multiplexer, separate that wavelength division multiplexer will transmit in A <- B optic fibre back to the rayleigh scattering signal with the communication signal separation, send into fiber coupler, communication signal then directly gets into wavelength division multiplexer, continues to transmit to the A end at A <- B optic fibre. A, B both ends can dispose COTDR equipment simultaneously, and the optical structure of COTDR signal is held each other in the relay amplifiers at different levels installation on two optic fibre for centrosymmetric transmission A, B. The utility model discloses communication signal's the damage of inserting reduces 2dB at least, improves the optical signal to noise ratio and reaches 2dB, be fit for being used for long distance communications optical cable, easily realize, be fit for popularizing and applying.
Description
Technical field
This utility model is related to transmission cable health monitoring technique field, and specially a kind of light relaying amplifying fiber link passes
The optical texture of defeated cotdr signal.
Background technology
For the optical cable of long range propagation, in order to make up optical signal transmission loss, typically there is multilevel relay amplifier,
Referred to as light relaying amplifies link.Amplify link, such as submarine optical fiber cable, across desert length in some light relayings being not easy to manual maintenance
Apart from optical cable etc., in order to check that on whole optical fiber link, the signal gain of each relay amplifier, optical cable whether rupture and to disconnected
Point location etc., is currently that employing can be detected through the cotdr (relevant detection optical time domain reflectometer) of fiber amplifier.
Existing cotdr is used for the detection of double fibre bidirectional optical fiber communication systems, Transmission Fibers one end (hereinafter referred to as a is end) two
Root optical fiber connects emission port and the receiving port of cotdr equipment respectively, and cotdr light pulse detectable signal is in the descending light at a end
Transmit in fibre；The backward Rayleigh scattering signal of the cotdr that the uplink optical fibers transmission at a end returns.The other end of Transmission Fibers is referred to as b
End.The signal of communication of b end transmitting transmits in the downlink optical fiber at b end and is received by a end, and the downlink optical fiber at b end is the up of a end
Optical fiber, and the downlink optical fiber at a end is the uplink optical fibers at b end.
The n level that cotdr optical fiber link detecting system includes matching with n level light relay amplifier transmits cotdr signal
Optical texture, each optical texture contains circulator and 3db fiber coupler.The cotdr equipment at transmission cable a end sends light arteries and veins
Rush detectable signal, transmit in the downlink optical fiber at a end and at different levels smooth relay amplifier thereon, in each light of downlink optical fiber
Continue amplifier back clevis shape device, and the backward Rayleigh scattering signal in light pulse detectable signal after amplification passes through circulator from this
Separate in Transmission Fibers, access the 3db fiber coupler in the uplink optical fibers of corresponding a end, this grade in 3db fiber coupler
Backward Rayleigh scattering signal is coupled with the signal of communication of transmission and rear class Rayleigh scattering signal in uplink optical fibers, enters a end together
Uplink optical fibers, common transport to Transmission Fibers a end, backward Rayleigh signal sets to cotdr through the filtering output of end wavelength division multiplexer
Standby receiving terminal.Cotdr equipment receives the n light pulse sequence returning through n level optical texture, judges the shape of optical fiber link accordingly
State.
The optical texture of current transmission cotdr signal is installed in light relaying amplifying fiber link, in order to realize growing away from
From optical cable, the particularly health detection of submarine optical fiber cable.
But the optical texture due to transmitting cotdr signal employs 3db fiber coupler, uplink optical fibers in uplink optical fibers
The signal of communication of middle transmission has to pass through fiber coupler, and the wherein signal of communication Insertion Loss of transmission is more than 3db, and Insertion Loss is larger, shadow
Ring communication quality.
Utility model content
The purpose of this utility model is to overcome existing cotdr signal transmission optics structure to introduce excessive the lacking of Insertion Loss
Point, provides a kind of light to relay the optical texture of amplifying fiber link transmission cotdr signal, increases solution wavelength division multiplexer and wavelength-division is multiple
Made with device the signal of communication in uplink optical fibers bypass fiber coupler continue transmission, and the backward Rayleigh scattering signal of this grade and after
The backward Rayleigh scattering signal of level passes through to solve wavelength division multiplexer, fiber coupler, wavelength division multiplexer and coupling together with signal of communication
Close and enter uplink optical fibers transmission；This optical texture makes signal of communication without 3db fiber coupler, reduces its Insertion Loss.
A kind of light of this utility model design relays the optical texture of amplifying fiber link transmission cotdr signal, described light
Two Transmission Fibers are had, respectively there is a communication equipment at a, b end between a end of relaying amplifying fiber link and b end；A end also configures that
Cotdr equipment.
A → b optical fiber and a ← b optical fiber mutually transmit signal of communication for a, b end.A → b optical fiber is the downlink optical fiber at a end, a
The signal that end communication equipment sends transmits to b end in a → b optical fiber, and a ← b optical fiber is the uplink optical fibers at a end, a end communication equipment
Receive the b end signal of communication being transferred to a end in a ← b optical fiber.It can be seen that, the uplink optical fibers at a → b optical fiber i.e. b end, b end leads to
Letter equipment receives a end signal of communication being transferred to b end in a → b optical fiber, the downlink optical fiber at a ← b optical fiber i.e. b end, b end
The signal of communication that equipment sends transmits to a end in a ← b optical fiber.
Mutually corresponding n level relay amplifier is respectively had on a → b optical fiber and a ← b optical fiber, a end of a → b optical fiber is through a end ripple
Division multiplexer connects the signal sending end of a end communication equipment and the transmitting terminal of a end cotdr equipment, a end warp of a ← b optical fiber respectively
A end solves the signal receiving end that wavelength division multiplexer connects a end cotdr equipment receiving terminal and a end communication equipment, a end cotdr signal and
The wavelength of the signal of communication that a, b end communication equipment sends is all different；The b end of a → b optical fiber connects the receiving terminal of b end communication equipment,
The b end of a ← b optical fiber connects the transmitting terminal of b end communication equipment.
Described cotdr equipment is located at a end, and the optical texture of described transmission cotdr signal is transmission a end cotdr signal
Optical texture, including circulator and fiber coupler.Every grade of relay amplifier on described a → b optical fiber and a ← b optical fiber is all joined
Close the optical texture installing a set of transmission a end cotdr signal.Ring in the optical texture of wherein every grade transmission a end cotdr signal
Shape device has three ports, and fiber coupler has 2 inputs and an outfan.In the first port of circulator and a → b optical fiber
The outfan of relay amplifier at the same level connect, the second port of circulator connects the next stage relay amplifier leading to this optical fiber
A → b optical fiber, one input of the 3rd port and fiber coupler of circulator is connected.
The optical texture of transmission cotdr signal of the present utility model also includes solving wavelength division multiplexer and wavelength division multiplexer, with
The solution wavelength division multiplexer of first order optics structure and wavelength division multiplexer are connected in a ← b optical fiber, positioned at this level relaying of a ← b optical fiber
The input side of amplifier；Solution wavelength division multiplexer and wavelength division multiplexer are three ports, and three ports are respectively common port, thoroughly
Penetrate end and reflection end, the common port of solution wavelength division multiplexer is connected with a ← b optical fiber at rear, and it is another that transmission end connects fiber coupler
One input, reflection end then connects the reflection end of wavelength division multiplexer；Wavelength division multiplexer transmission end connects fiber coupler outfan,
Common port then connects this grade of relay amplifier input of a ← b optical fiber.
The solution wavelength division multiplexer of certain grade of optical texture will before this grade of transmission in a ← b optical fiber multistage rear to
Rayleigh scattering signal is separated with signal of communication, sends into fiber coupler, and signal of communication is then directly entered wavelength division multiplexer, optical fiber
The backward Rayleigh scattering signal of the relay amplifier of this grade of a → b optical fiber that circulator is isolated by bonder and solution wavelength-division multiplex
The multistage backward Rayleigh scattering signal coupling of what device was sent into, sends into the wavelength division multiplexer in front of fiber coupler, by this level and
Multistage backward Rayleigh scattering signal in front of it closes ripple, amplification with the signal of communication in a ← b optical fiber, continues to a in a ← b optical fiber
End transmission.
The backward Rayleigh scattering signal that the optical texture of n level transmission a end cotdr signal is isolated is with b end signal of communication altogether
A end is transported in simultaneous interpretation, then solves, through a end, receiving terminal and a end signal of communication that wavelength division multiplexer respectively enters a end cotdr equipment
The receiving terminal of equipment, a end cotdr equipment receives the n a end cotdr returning through the optical texture that n level transmits a end cotdr signal
Light pulse sequence.
A, b two ends can configure cotdr equipment simultaneously, and the optical texture of transmission a end cotdr signal is as described above.B end is simultaneously
Configuration cotdr equipment, the b end of a ← b optical fiber connects signal sending end and the b of b end communication equipment respectively through b end wavelength division multiplexer
The transmitting terminal of end cotdr equipment, b end cotdr signal is different with the wavelength of the signal of communication that a, b end communication equipment sends, and
Different from a end cotdr signal wavelength；The b end of a → b optical fiber through b end solution wavelength division multiplexer connect b end cotdr equipment receiving terminal and
The signal receiving end of b end communication equipment.
B end cotdr sends light pulse detectable signal from optical fiber link b end, i.e. b end cotdr signal, along optical fiber link b end
Downlink optical fiber be a ← b fiber-optic transfer.
Every grade of relay amplifier on described a → b optical fiber and a ← b optical fiber also coordinates installation a set of transmission b end cotdr letter
Number optical texture.The optical texture of transmission b end cotdr signal and the critical piece of the optical texture transmitting a end cotdr signal
Identical, the optical texture of transmission b end cotdr signal that optical fiber link is installed and the optical texture phase transmitting a end cotdr signal
Centrosymmetry each other.The optical texture circulator first port of transmission b end cotdr signal is put with the relaying at the same level on a ← b optical fiber
The outfan of big device connects, and circulator second port connects a ← b optical fiber of the next stage relay amplifier leading to this optical fiber, ring
Shape device the 3rd port is connected with one input of fiber coupler of this optical texture.The solution wavelength division multiplexer of this optical texture and
Wavelength division multiplexer is connected in a → b optical fiber, positioned at the input side of this grade of relay amplifier of a → b optical fiber；This optics is tied
The common port of the solution wavelength division multiplexer of structure is connected with a → b optical fiber at rear, and transmission end connects another input of fiber coupler,
Reflection end then connects the reflection end of wavelength division multiplexer；Wavelength division multiplexer transmission end connects fiber coupler outfan, and common port is then
Connect this grade of relay amplifier input of a → b optical fiber.
Often when one-level relay amplifier, b end cotdr signal is exaggerated, and enters transmission b end cotdr signal afterwards
Optical texture, solution wavelength division multiplexer therein by this grade multistage backward Rayleigh scattering signal before of transmission in a → b optical fiber with
Signal of communication demultiplexes, and sends into an input of fiber coupler, and signal of communication is then directly entered wavelength division multiplexer, optical fiber
The backward Rayleigh scattering signal of the relay amplifier of this grade of a ← b optical fiber that the circulator of this optical texture is isolated by bonder
With solution wavelength division multiplexer send into multistage backward Rayleigh scattering signal couple, deliver to wavelength division multiplexer, with signal of communication answer
With being again introduced into a → b optical fiber.
The backward Rayleigh scattering signal that the optical texture of n level transmission b end cotdr signal is isolated is with a end signal of communication altogether
B end is transported in simultaneous interpretation, then solves, through b end, receiving terminal and the b end signal of communication that wavelength division multiplexer respectively enters b end cotdr equipment
The receiving terminal of equipment, b end cotdr equipment receives the n b end cotdr returning through the optical texture that n level transmits b end cotdr signal
Light pulse sequence.
Its operation wavelength of described circulator comprises wave band c and l wave band.
Described fiber coupler, its operation wavelength comprises wave band c and l wave band, and preferred plan is the optical fiber coupling of splitting ratio 1:1
Clutch, or claim 3db bonder.
Described wavelength division multiplexer conciliate centered on the transmitted wave of wavelength division multiplexer wavelength with joined together by this optical texture
The narrow spectral signal ripple of cotdr signal work consistent wavelength, echo comprises the communication letter of residing fiber-optic transfer for wave-length coverage
The wide spectrum signal wave of number wavelength, common port carries two kinds of signals simultaneously.When optical fiber link a, b two ends all configure cotdr equipment
When, ripple conciliate by the optical texture of transmission b end cotdr signal and the wavelength division multiplexer in the optical texture of transmission a end cotdr signal
Division multiplexer transmission peak wavelength is different, respectively consistent with the operation wavelength of cotdr direct impulse signal joined together.
Compared with prior art, a kind of light of this utility model relays the optics knot of amplifying fiber link transmission cotdr signal
The beneficial effect of structure is: 1, reduces the Insertion Loss of signal of communication, optical texture of the present utility model inserts before and after fiber coupler
Understand wavelength division multiplexer and wavelength division multiplexer, signal of communication does not pass through fiber coupler when passing through this optical texture, therefore introduce and insert
Damage only about 1db, and the optical texture signal of communication of existing transmission cotdr signal Insertion Loss when by fiber coupler reach 3db,
Insertion Loss at least reduces 2db, therefore the OSNR that this utility model can improve light relaying amplifying fiber link reaches 2db；2nd, because of this reality
Reduce Insertion Loss with new, therefore be suitable for the communications optical cable of distance, particularly submarine communication cable；3rd, of the present utility model
Optical texture only installs solution wavelength division multiplexer and wavelength division multiplexer additional, it is easy to accomplish, suitable popularization and application.
Brief description
Fig. 1 is the optical texture embodiment schematic diagram that this light relays amplifying fiber link transmission cotdr signal；
Fig. 2 is installed on, for the present embodiment, the schematic diagram that light relays amplifying fiber link Application Example 1, at cotdr equipment
In this optical fiber link a end；
Fig. 3 is installed on, for the present embodiment, the schematic diagram that light relays amplifying fiber link Application Example 2, and two cotdr set
Standby it is respectively at this optical fiber link a end and b end.
1st, the relay amplifier on a → b optical fiber, 2, circulator, 3, a → b optical fiber, 4, a ← b optical fiber, 5, solution wavelength-division multiplex
Device, 6, fiber coupler, 7, wavelength division multiplexer, 8, the relay amplifier on a ← b optical fiber, on 1-1～1-16, a → b optical fiber
16 grades of relay amplifiers, 16 grades of relay amplifiers on 8-1～8-16, a ← b optical fiber, m1～m16,16 grades of transmission a end cotdr
The optical texture of signal, n1～n16, the optical texture of 16 grades of transmission b end cotdr signals, a9, a end solution wavelength division multiplexer, a10,
A end wavelength division multiplexer, b9, b end solution wavelength division multiplexer, b10, b end wavelength division multiplexer,
Specific embodiment
Light relays the optical texture embodiment of amplifying fiber link transmission cotdr signal
This light relays the optical texture embodiment of amplifying fiber link transmission cotdr signal as shown in figure 1, this example light relays
There are two Transmission Fibers, a → b optical fiber 3 (arrow optical fiber to the left in Fig. 1) and a ← b between a end of amplifying fiber link and b end
Optical fiber 4 (optical fiber of arrow right in Fig. 1), mutually transmits signal of communication for a, b end, and this example a, b end communication equipment sends
The wavelength of signal of communication is identical.
Mutually corresponding n level relay amplifier 1,8 is respectively had on a → b optical fiber 3 and a ← b optical fiber 4.This example cotdr equipment position
In a end, the optical texture that this example transmits cotdr signal is the optical texture of transmission a end cotdr signal, including circulator 2, light
Fine bonder 6, solution wavelength division multiplexer 5 and wavelength division multiplexer 7.Every grade of relaying on described a → b optical fiber 3 and a ← b optical fiber 4 amplifies
Device 1,8 all coordinates the optical texture installing a set of transmission a end cotdr signal.The optics of wherein every grade transmission a end cotdr signal
Circulator 2 in structure has three ports, and fiber coupler 6 has 2 inputs and an outfan.The first end of circulator 2
Mouth is connected with the outfan of the relay amplifier at the same level 1 on a → b optical fiber 3, and the second port of circulator 2 connects leads to this optical fiber
Next stage relay amplifier a → b optical fiber 3,6 one inputs of the 3rd port and fiber coupler of circulator 2 are connected.Should
The solution wavelength division multiplexer 5 of optical texture and wavelength division multiplexer 7 are connected in a ← b optical fiber 4, positioned at this level relaying of a ← b optical fiber 4
The input side of amplifier 8；Solution wavelength division multiplexer 5 and wavelength division multiplexer 7 are three ports, and three ports are respectively public
End, transmission end and reflection end, the common port of solution wavelength division multiplexer 5 is connected with a ← b optical fiber 4 at rear, and transmission end connects optical fiber coupling
Another input of clutch 6, reflection end then connects the reflection end of wavelength division multiplexer 7；Wavelength division multiplexer 7 transmission end connects optical fiber coupling
Device 6 outfan, common port then connects this grade of relay amplifier 8 input of a ← b optical fiber 4.
This example circulator 2 operation wavelength comprises wave band c and l wave band.
This example fiber coupler 6 is 3db fiber coupler, and operation wavelength comprises wave band c and l wave band.
This example wavelength division multiplexer 7 is conciliate joined together by wavelength and this optical texture centered on the transmitted wave of wavelength division multiplexer 5
The narrow spectral signal ripple of cotdr signal work consistent wavelength, echo comprises the communication letter of residing fiber-optic transfer for wave-length coverage
The wide spectrum signal wave of number wavelength, common port carries two kinds of signals simultaneously.
The solution wavelength division multiplexer of certain grade of optical texture will before this grade of transmission in a ← b optical fiber multistage rear to
Rayleigh scattering signal is separated with signal of communication, sends into fiber coupler, and signal of communication is then directly entered wavelength division multiplexer, optical fiber
The backward Rayleigh scattering signal of the relay amplifier of this grade of a → b optical fiber that circulator is isolated by bonder and solution wavelength-division multiplex
The multistage backward Rayleigh scattering signal coupling of what device was sent into, sends into the wavelength division multiplexer in front of fiber coupler, by this level and
Signal of communication in multistage backward Rayleigh scattering signal in front of it and a ← b optical fiber closes ripple, amplification, a ← b optical fiber continue to
A end is transmitted.
The backward Rayleigh scattering signal that the optical texture of n level transmission a end cotdr signal is isolated is with b end signal of communication altogether
A end is transported in simultaneous interpretation, then solves, through a end, receiving terminal and a end signal of communication that wavelength division multiplexer respectively enters a end cotdr equipment
The receiving terminal of equipment, a end cotdr equipment receives the n a end cotdr returning through the optical texture that n level transmits a end cotdr signal
Light pulse sequence.
The optical texture Application Example 1 of transmission cotdr signal
The optical texture embodiment that Fig. 2 show above-mentioned light relaying amplifying fiber link transmission cotdr signal is installed on light
The embodiment 1 of relaying amplifying fiber link." optical texture of transmission cotdr signal " hereinafter referred to as optical texture.
Respectively there is a communication equipment at a, b end that this example light relays amplifying fiber link, and transmission ch21 (1560.61nm) is extremely
The 40 ripple dense wavelength division signals of ch60 (1529.19nm), cotdr equipment is installed on a end that light relays amplifying fiber link.A end
The bank end that generally submarine optical fiber cable transmits.Cotdr equipment includes light pulses end and receiving terminal.Send wavelength 1561.42nm
(ch20) descending light pulse detectable signal.There have on a → b optical fiber 3 of light relaying amplifying fiber link and a ← b optical fiber 4 to be mutually right
The 16 grades of relay amplifiers answered, i.e. the 1st grade of a → b Optical fiber relay amplifier 1- of installation successively separated by a distance on a → b optical fiber 3
1 to the 16th grade of a → b Optical fiber relay amplifier 1-16, and corresponding 1st grade of a ← b Optical fiber relay amplifier 8-1 is extremely
16th grade of a ← b Optical fiber relay amplifier 8-16, is furnished with a set of above-mentioned optical texture after every one-level relay amplifier, that is, schemes
In m1 to m16.
The a end of a → b optical fiber 3 connects signal sending end and a end of a end communication equipment respectively through a end wavelength division multiplexer a10
The transmitting terminal of cotdr equipment, a end of a ← b optical fiber 4 connects a end cotdr equipment receiving terminal and a through a end solution wavelength division multiplexer a9
The signal receiving end of end communication equipment, the centre of homology wavelength that wavelength division multiplexer conciliate by wavelength division multiplexer is all ch20, with cotdr
Device signal consistent wavelength is different from signal of communication wavelength ch21-ch60 that communication equipment sends；The b end of a → b optical fiber 3 is even
Connect the receiving terminal of b end communication equipment, the b end of a ← b optical fiber 4 connects the transmitting terminal of b end communication equipment.
A end cotdr equipment includes transmitting terminal and receiving terminal, and the cotdr descending light pulse detectable signal that it sends is through first
Export the light pulse detectable signal of amplification after level a → b Optical fiber relay amplifier 1-1, enter the annular in the 1st grade of optical texture m1
Device 2, the backward Rayleigh scattering signal of light pulse detectable signal isolates a → b optical fiber 3 by this circulator 2, enters in m1
3db fiber coupler 6；Signal of communication that send from the communication equipment at this optical fiber link b end, transmission a ← b optical fiber 4,
When reaching the 1st grade of optical texture m1, the 2nd grade of a ← b Optical fiber relay amplifier 8-2 in a ← b optical fiber 4 is produced by solution wavelength division multiplexer
And backward Rayleigh scattering signal demultiplexing before, send into the 3db fiber coupler 6 of m1, and b end signal of communication be direct
By solving wavelength division multiplexer 5；A ← b is sent into the 1st together with the backward Rayleigh scattering signal of a → b optical fiber by 3db fiber coupler 6
The wavelength division multiplexer 7 of level optical texture m1 enters the 1st grade of light relay amplifier of a ← b optical fiber 4 with b end signal of communication after being multiplexed
8-1, solves wavelength division multiplexer a9 subsequently into a end, and b end signal of communication is received by a end communication equipment, and backward Rayleigh scattering signal enters
Enter the receiving terminal of cotdr equipment, form the 1st cotdr and receive pulse.Cotdr light pulse detectable signal is continued by a → b optical fiber 3
The continuous light pulse detectable signal being transferred to the 2nd grade of a → b Optical fiber relay amplifier 1-2, exporting amplification, enters the 2nd grade of optical texture
Circulator in m2, the backward Rayleigh scattering signal of light pulse detectable signal isolates a → b optical fiber 3 by the circulator in m2,
Send into the 3db fiber coupler in m2；The b end signal of communication of uplink in a ← b optical fiber 4 reaches the 2nd grade of optical texture m2
When, in m2, solution wavelength division multiplexer, by backward Rayleigh scattering signal demultiplexing all of in a ← b optical fiber 4, sends into the 3db optical fiber of m2
Bonder, and b end signal of communication directly passes through to solve wavelength division multiplexer；3db fiber coupler by a → b, a ← b optical fiber auspicious backward
Sharp scattered signal is sent into together after wavelength division multiplexer is multiplexed with b end signal of communication and is entered the 2nd grade of light relay amplifier of a ← b optical fiber
8-1, subsequently into the receiving terminal of cotdr equipment, forms second cotdr and receives pulse.So carry out successively, formed the 1st to
16th cotdr accepts pulse, can determine whether the state of optical fiber link accordingly.
The optical texture Application Example 2 of transmission cotdr signal
This application embodiment 2 is as shown in figure 3, optical fiber link a, b two ends are respectively provided with cotdr equipment and communication equipment, phase
Mutually independent operating.Mutually corresponding 16 grades of relayings are had to amplify on a → b optical fiber 3 of light relaying amplifying fiber link and a ← b optical fiber 4
Device, i.e. Optical fiber relay amplifier 1-1 to the 16th grade of a → b Optical fiber relay amplifier 1-16 of the 1st grade of a → b, and corresponding the 1st
Level Optical fiber relay amplifier 8-1 to the 16th grade of a ← b Optical fiber relay amplifier 8-16 of a ← b, joins after every one-level relay amplifier
There are a set of a end optical texture matching with a end cotdr equipment, the i.e. m1 to m16 of in figure.A end cotdr equipment sends
The wavelength of cotdr light pulse detectable signal is ch20, and the transmission peak wavelength of the wavelength division multiplexer of corresponding m1 to m16 is also ch20；Often
It is furnished with a set of optical texture matching with b end cotdr equipment, the i.e. n1 to n16 of in figure, b end after one-level relay amplifier
The wavelength of the cotdr light pulse detectable signal that cotdr equipment sends is ch19, the transmission of the wavelength division multiplexer of corresponding n1 to n16
Wavelength is also ch19.N1 to n16 is the b end optical texture of cooperation b end cotdr equipment, and with b end as end, a end is top, Fig. 3
The structure of middle n1 to n16 is identical with m1 to m16, symmetrical centered on the installation of a, b ends at different levels optical texture is mutual.The upper half of Fig. 3
The cotdr equipment at part expression a end and communication equipment and the 1st grade of a → b Optical fiber relay amplifier 1-1 are to 3rd level a → b optical fiber
Relay amplifier 1-3, the 1st grade of a ← b Optical fiber relay amplifier 8-1 to 3rd level a ← b Optical fiber relay amplifier 8-3, and optics
Structure m1 to m3 and optical texture n1 to n3.The latter half of Fig. 3 represents cotdr equipment and communication equipment and the 14th at b end
Level Optical fiber relay amplifier 1-14 to the 16th grade of a → b Optical fiber relay amplifier 1-16 of a → b, the 14th grade of a ← b Optical fiber relay amplifies
Device 8-14 to the 16th grade of a ← b Optical fiber relay amplifier 8-16, and optical texture m14 to m16 and optical texture n14 to n16.
P, q of first half right-hand member is connected with p, q of the latter half left end respectively.Other relay amplifiers and optical texture are not in figure 3
Display.
The cotdr light pulse detectable signal of the wavelength ch20 that a end cotdr equipment sends sequentially passes through 16 in a → b optical fiber 3
Level a → b optical fiber light relay amplifier 1-1 to 1-16, and optical texture m1 to m16, then 16 grades of a ← b optical fiber through a ← b optical fiber 4
Light relay amplifier 8-1 to 8-16, returns the 16 reception pulses of a end cotdr equipment.Because in optical texture n1 to n16, wavelength-division is multiple
Mismatched with the wavelength of the cotdr light pulse detectable signal at a end with the transmission peak wavelength of device, the cotdr light pulse detectable signal at a end
Directly wavelength division multiplexer is conciliate by the wavelength division multiplexer of optical texture n1 to n16.
The cotdr light pulse detectable signal of the wavelength ch19 that similar b end cotdr equipment sends is in a ← b optical fiber 4 successively
Through 16 grades of a ← b optical fiber light relay amplifier 8-16 to 8-1, and optical texture n16 to n1, then 16 grades of a through a → b optical fiber 3
→ b optical fiber light relay amplifier 1-1 to 1-16, returns the 16 reception pulses of b end cotdr equipment.
A end and b end all configure cotdr equipment and light relaying amplifying fiber both link ends can be made can to monitor optical cable health shape
State, when optical cable has two breakpoints simultaneously, the cotdr of one end can only detect and position with local terminal apart near breakpoint it is impossible to visit
Measure another, the same other end also can only detect with it apart near breakpoint.Two ends configure cotdr equipment simultaneously can be more complete
Face optical cable state is detected.
Above-described embodiment, only further describes to the purpose of this utility model, technical scheme and beneficial effect
Specific case, this utility model is not limited to this.All done within scope of disclosure of the present utility model any repair
Change, equivalent, improvement etc., be all contained within protection domain of the present utility model.
Claims (6)
1. a kind of light relays the optical texture of amplifying fiber link transmission cotdr signal, and described light relays a of amplifying fiber link
There are two Transmission Fibers, a → b optical fiber (3) and a ← b optical fiber (4) between end and b end；Respectively there is a communication equipment at a, b end；A end
Also configure that cotdr equipment；
Mutually corresponding n level relay amplifier is respectively had on a → b optical fiber (3) and a ← b optical fiber (4), a end of a → b optical fiber (3) is through a
End wavelength division multiplexer (a10) connects the signal sending end of a end communication equipment and the transmitting terminal of a end cotdr equipment, a ← b light respectively
The a end of fine (4) solves, through a end, the signal reception that wavelength division multiplexer (a9) connects a end cotdr equipment receiving terminal and a end communication equipment
The wavelength of the signal of communication that end, a end cotdr signal and a, b end communication equipment send is all different；The b end of a → b optical fiber (3) connects
The receiving terminal of b end communication equipment, the b end of a ← b optical fiber (4) connects the transmitting terminal of b end communication equipment；
Described cotdr equipment is located at a end, and the optical texture of described transmission cotdr signal is the optics of transmission a end cotdr signal
Structure, including circulator (2) and fiber coupler (6), every grade of relaying on described a → b optical fiber (3) and a ← b optical fiber (4) is put
Big device all coordinates the optical texture installing a set of transmission cotdr signal；In the optical texture of wherein every grade transmission cotdr signal
Circulator (2) has three ports, and fiber coupler (6) has 2 inputs and an outfan；The first port of circulator (2)
It is connected with the outfan of the relay amplifier at the same level on a → b optical fiber (3), the second port of circulator (2) connects leads to this optical fiber
Next stage relay amplifier a → b optical fiber (3), (6) inputs of circulator (2) the 3rd port and fiber coupler are even
Connect；It is characterized in that:
The optical texture of described transmission cotdr signal also includes solving wavelength division multiplexer (5) and wavelength division multiplexer (7), with one-level light
Learn the solution wavelength division multiplexer (5) of structure and wavelength division multiplexer (7) is connected in a ← b optical fiber (4), being somebody's turn to do positioned at a ← b optical fiber (4)
The input side of level relay amplifier；Solution wavelength division multiplexer (5) and wavelength division multiplexer (7) are three ports, and three ports are divided
Not Wei common port, transmission end and reflection end, the common port of solution wavelength division multiplexer (5) is connected with a ← b optical fiber (4) at rear, transmission
End connects another input of fiber coupler (6), and reflection end then connects the reflection end of wavelength division multiplexer (7)；Wavelength division multiplexer (7)
Transmission end connects fiber coupler (6) outfan, and common port then connects this grade of relay amplifier input of a ← b optical fiber (4).
2. light according to claim 1 relays the optical texture of amplifying fiber link transmission cotdr signal, and its feature exists
In:
The b end that described light relays amplifying fiber link configures b end cotdr equipment simultaneously, and the b end of a ← b optical fiber (4) is through the wavelength-division of b end
Multiplexer (b10) connects the signal sending end of b end communication equipment and the transmitting terminal of b end cotdr equipment, b end cotdr signal respectively
Different with the wavelength of the signal of communication that a, b end communication equipment sends, and different from a end cotdr signal wavelength；A → b optical fiber
(4) b end solves, through b end, the signal receiving end that wavelength division multiplexer (b9) connects b end cotdr equipment receiving terminal and b end communication equipment；
B end cotdr equipment sends light pulse detectable signal from optical fiber link b end, i.e. b end cotdr signal, along optical fiber link b end
Downlink optical fiber be a ← b optical fiber (4) transmission；
Every grade of relay amplifier on described a → b optical fiber (3) and a ← b optical fiber (4) also coordinates a set of transmission b end cotdr of installation
The optical texture of signal；The optical texture of transmission b end cotdr signal and the main portion of the optical texture transmitting a end cotdr signal
Part is identical, the optical texture of the optical texture of transmission b end cotdr signal that optical fiber link is installed and transmission a end cotdr signal
Symmetrical centered on mutually；In the first port of optical texture circulator (2) and a ← b optical fiber (4) of transmission b end cotdr signal
The outfan of relay amplifier at the same level connects, and the second port of circulator (2) connects the next stage relaying amplification leading to this optical fiber
A ← b optical fiber (4) of device, circulator (2) the 3rd port is connected with (6) inputs of fiber coupler of this optical texture；This
The solution wavelength division multiplexer (5) of optical texture and wavelength division multiplexer (7) are connected in a → b optical fiber (3), positioned at a → b optical fiber (3)
The input side of this grade of relay amplifier；The common port of solution wavelength division multiplexer (5) of this optical texture and a → b light at rear
Fine (3) connect, and transmission end connects another input of fiber coupler (6), and reflection end then connects the reflection of wavelength division multiplexer (7)
End；Wavelength division multiplexer (7) transmission end connects fiber coupler (6) outfan, and common port then connects in this level of a → b optical fiber (3)
Continue amplifier in.
3. light according to claim 1 and 2 relays the optical texture of amplifying fiber link transmission cotdr signal, its feature
It is:
Described circulator (2) operation wavelength comprises wave band c and l wave band.
4. light according to claim 1 and 2 relays the optical texture of amplifying fiber link transmission cotdr signal, its feature
It is:
Described fiber coupler (6) operation wavelength comprises wave band c and l wave band.
5. light according to claim 4 relays the optical texture of amplifying fiber link transmission cotdr signal, and its feature exists
In:
Described fiber coupler (6) is the 3db fiber coupler of splitting ratio 1:1.
6. light according to claim 4 relays the optical texture of amplifying fiber link transmission cotdr signal, and its feature exists
In:
Described wavelength division multiplexer (7) conciliate centered on the transmitted wave of wavelength division multiplexer (5) wavelength with joined together by this optical texture
The narrow spectral signal ripple of cotdr signal work consistent wavelength, echo comprises the communication letter of residing fiber-optic transfer for wave-length coverage
The wide spectrum signal wave of number wavelength, common port carries two kinds of signals simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620705222.8U CN205912059U (en) | 2016-07-05 | 2016-07-05 | Light relaying enlargies optical structure of optical fiber link transmission COTDR signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620705222.8U CN205912059U (en) | 2016-07-05 | 2016-07-05 | Light relaying enlargies optical structure of optical fiber link transmission COTDR signal |
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|---|---|
| CN205912059U true CN205912059U (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620705222.8U Withdrawn - After Issue CN205912059U (en) | 2016-07-05 | 2016-07-05 | Light relaying enlargies optical structure of optical fiber link transmission COTDR signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939172A (en) * | 2016-07-05 | 2016-09-14 | 中国电子科技集团公司第三十四研究所 | Optical structure used for transmitting coherent COTDR (optical timedomain reflectometry) signals and applied to optical relay amplifying optical fiber link |
-
2016
- 2016-07-05 CN CN201620705222.8U patent/CN205912059U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939172A (en) * | 2016-07-05 | 2016-09-14 | 中国电子科技集团公司第三十四研究所 | Optical structure used for transmitting coherent COTDR (optical timedomain reflectometry) signals and applied to optical relay amplifying optical fiber link |
| CN105939172B (en) * | 2016-07-05 | 2019-01-25 | 中国电子科技集团公司第三十四研究所 | A kind of optical texture of light relaying amplifying fiber link transmission COTDR signal |
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