CN101309117A - Method and device for gain balance of submarine fiber cable - Google Patents
Method and device for gain balance of submarine fiber cable Download PDFInfo
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- CN101309117A CN101309117A CN 200810100347 CN200810100347A CN101309117A CN 101309117 A CN101309117 A CN 101309117A CN 200810100347 CN200810100347 CN 200810100347 CN 200810100347 A CN200810100347 A CN 200810100347A CN 101309117 A CN101309117 A CN 101309117A
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Abstract
The invention provides a method and a device for grain equalization of undersea optical cables. The grain equalization device of undersea optical cables comprises: a first optical branching component, which is connected to the optical transmission lines of the undersea optical cables from a part of output branch of an optical attenuation component, an optical amplification component and the optical attenuation component; an output side beam receiving component, which receives branching optical signals from the first optical branching component; an optical amplification control component, which responds to the signals from the output side beam receiving component and controls the state of the optical amplification component; a second optical branching component, which outputs a part of beams in branches; an input side beam receiving component, which receives branching optical signals from the second optical branching component; and an optical attenuation component, which responds to the signals from the input side beam receiving component and controls the state of the optical attenuation component, wherein, the optical amplification control component selects the output constant state of the optical amplification component, and the optical attenuation control component selects the output of the optical attenuation component that has the state of expected optical signal level difference.
Description
Technical field
The invention provides a kind of method and apparatus of gain balance, it comprises the module and the optical fiber of gain balance still less, the module of described gain balance and the minimizing of number of fibers are to realize by following straightforward procedure: before construction under the sea comprises the submarine fiber cable system of gainequalizer, in the characteristic of checking whole system, utilize the electronic circuit that is contained in the gainequalizer to select optimum state with a plurality of states.
Background technology
For the purpose that illustrates more fully about prior art level of the present invention, quoted in full for referencial use at this at this all patent of quoting or identifying, patent application, patent disclosure, technical paper etc.
Usually, under the sea, build before the submarine fiber cable system, select a gain balance module from preprepared a plurality of gain balance modules of having estimated its characteristic, make transmission line have best equalization characteristic, selected then module is installed on the transmission line.More specifically, as shown in Figure 1, these modules 2 are contained in the gainequalizer 1.Many modules of holding 2 might be remaining no.This structure provides the implementation space of compression and has prevented miniaturization in gainequalizer; In addition, a large amount of optical fiber of drawing in the slave unit brings huge burden for manufacturing and process of construction.For those reasons, equipment cost is difficult to reduce.
Thereby, for example to have narrated goal of the invention be after building the submarine fiber cable system " a kind of gainequalizer and light amplification transmission line that can change equalization characteristic is provided " to patent file 1, and provide a solution, according to this solution, " variable optical attenuator 22 receives an input beam and each input beam wavelength is decayed with same decay factor.The decay factor relative wavelength of this variable optical attenuator 22 is constants, and this factor can be along with from the signal of telecommunication of housing exterior or from the command signal in terminal station and change.”
In addition, patent file 2 has been narrated a problem in the submarine fiber cable system, " transmission line has a gain tilt in the real system; this inclination is subjected to the influence of the characteristic of optical cable, light amplification transponder etc. significantly ", and provide a solution, the employed structure of this scheme comprise " control circuit 30; it is in response to the characteristic of the gain tilt of gain tilt that is produced by the power difference of photodiode 24 and 25 electrical signal converted and light amplification transponder 13, and it is smooth that the decay of decision input signal power Pi makes that the gain tilt of output signal power Po flattens; And a VOA (variable optical attenuator) 31, it utilizes decay of control circuit 30 decisions input signal power Pi that decays ".
Patent file 1: the open No.2000-31916 of Japan Patent
Patent file 2: the open No.2003-46169 of Japan Patent
Summary of the invention
The technical problem that invention is solved
Therefore, one object of the present invention is to provide a kind of method and apparatus of gain balance, and wherein variable optical attenuator is controllable, has eliminated the influence from image intensifer simultaneously, and wherein this image intensifer in response to output signal Be Controlled.
The means of dealing with problems
For addressing the above problem, a first aspect of the present invention is the method that is used for the submarine fiber cable gain balance, wherein light amplification component controls parts and optical attenuation parts are connected to the optical transmission line of submarine fiber cable, this method is further comprising the steps of: at the first smooth splitter component place, go out a part along separate routes from the output of optical attenuation parts; At outlet side light beam receiving-member place, receive shunt light signal from the described first smooth splitter component; At light amplification control assembly place, in response to from the signal of described outlet side light beam receiving-member and control the state of light amplification parts; At the second smooth splitter component place, go out the part of input beam along separate routes; At input side light beam receiving-member place, receive shunt light signal from the described second smooth splitter component; At optical attenuation control assembly place, in response to from the signal of described input side light beam receiving-member and control the state of described optical attenuation parts; At described light amplification control assembly place, select the constant state of output of described light amplification parts; And at described optical attenuation control assembly place, the state of selecting the output of described optical attenuation parts to have the optical signal level difference of expectation.
A second aspect of the present invention is the method that is used for the submarine fiber cable gain balance, wherein optical attenuation parts are connected to before the light amplification parts and part afterwards, and this method also comprises the step of state that the output of selecting described optical attenuation parts has the optical signal level difference of expectation.
A third aspect of the present invention is the method that is used for the submarine fiber cable gain balance, also be included in the step that described input side light beam receiving circuit place receives a light beam received signal, described input side light beam receiving circuit is connected to the optical attenuation control assembly via a wavelength filter.
A fourth aspect of the present invention is the method that is used for the submarine fiber cable gain balance, also be included in described outlet side light beam receiving circuit place and receive the step of a light beam received signal, described outlet side light beam receiving circuit is connected to the light amplification control assembly via a wavelength filter.
A fifth aspect of the present invention is the method that is used for the submarine fiber cable gain balance, also comprise maintenance from a signal of input side light beam receiving-member until the received step of next light reset signal, wherein said wavelength filter is connected to the optical attenuation control assembly via a smooth latch cicuit.
Then, a sixth aspect of the present invention is the method that is used for the submarine fiber cable gain balance, and wherein said smooth reset signal is the signal that goes out along separate routes from input beam.
In addition, the equipment that is used for the submarine fiber cable gain balance according to the present invention that is used to address the above problem comprises with lower member: the first smooth splitter component, its output from the optical attenuation parts goes out a part along separate routes, and light amplification parts and described optical attenuation parts are connected to the optical transmission line of submarine fiber cable; Outlet side light beam receiving-member, it receives the shunt light signal from the described first smooth splitter component; Light amplification component controls parts, it is in response to from the signal of described outlet side light beam receiving-member and control the state of light amplification parts; The second smooth splitter component, it is the part of input beam along separate routes; Input side light beam receiving-member, it receives the shunt light signal from the described second smooth splitter component; And optical attenuation control assembly, it is in response to from the signal of described input side light beam receiving-member and control the state of described optical attenuation parts, wherein said light amplification component controls parts are selected the constant state of output of described light amplification parts, and wherein said optical attenuation control assembly selects the output of described optical attenuation parts to have the state of the optical signal level difference of first phase prestige.
In addition, optical attenuation parts can be connected to before the light amplification parts and part afterwards, the state that the output of the described optical attenuation parts of feasible selection has the optical signal level difference of expectation.
And described input side light beam receiving circuit can be connected to the optical attenuation control assembly via a wavelength filter, and described input side light beam receiving circuit can receive a light beam received signal.
In addition, described outlet side light beam receiving circuit can be connected to light amplification component controls parts via a wavelength filter, and described outlet side light beam receiving circuit can receive a light beam received signal.
Subsequently, described wavelength filter can be connected to the optical attenuation control assembly via a smooth latch cicuit, and can be held from the signal of input side light beam receiving-member, is received until next light reset signal.
Then, the light reset signal can be the signal that goes out along separate routes from input beam.
Effect of the present invention
First effect that is used for the method and apparatus of submarine fiber cable gain balance is that can to obtain the optical signal level of the best of submarine fiber cable system poor, this is because before building under the sea, in actual determination module characteristic, adjust the level of light signal, and do not need to pre-estimate the characteristic of the module of use.
Therefore second effect is can make the structure of control circuit simpler because gainequalizer has the electronic circuit that has a plurality of states, and operator institute must do when using is exactly the state of selection the best from these states.
The 3rd effect is that the quantity of the optical fiber in the gainequalizer can reduce, and this is not select best mode because be not to use among the present invention from a plurality of gain balance modules.In addition, can obtain littler and have cost-benefit equipment, this is because those easily remaining obsolete modules needn't be installed.
And, can in the influence of eliminating image intensifer, control variable optical attenuator, and control image intensifer in response to output signal.
Description of drawings
Fig. 1 is the block diagram that traditional submarine fiber cable system equalization circuit is shown;
Fig. 2 is the block diagram that illustrates according to the gain balance equipment of the embodiment 1 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Fig. 3 is the chart that illustrates about according to the wavelength dependence of light amplification parts place's relative gain of the embodiment 1 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Fig. 4 illustrates about according to the light amplification parts place gain tilt of the embodiment 1 of the method and apparatus that the is used for the submarine fiber cable gain balance of the present invention chart to the dependence of gain;
Fig. 5 is the chart that illustrates about according to the variable optical attenuation parts key property of the embodiment 1 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Fig. 6 is the block diagram that illustrates according to the gain balance equipment of the embodiment 2 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Fig. 7 is the block diagram that illustrates according to the gain balance equipment of the embodiment 3 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Fig. 8 is the block diagram that illustrates according to the gain balance equipment of the embodiment 4 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Fig. 9 is the block diagram that illustrates according to the gain balance equipment of the embodiment 5 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention;
Figure 10 is the block diagram that illustrates according to the gain balance equipment of the embodiment 6 of the method and apparatus that is used for the submarine fiber cable gain balance of the present invention.
The explanation of Reference numeral
The gain balance equipment of 2 submarine fiber cables
The transmission line of 4 submarine fiber cable systems
6 first optical couplers
8 light amplification parts
10 variable optical attenuation parts
12 second optical couplers
14 input side light beam receiving circuits
16 variable optical attenuation component controls circuit
18 outlet side light beam receiving circuits
20 light amplification component controls circuit
22 first variable optical attenuation parts
24 second variable optical attenuation parts
30 first optical couplers
32 second optical couplers
34 the 3rd optical couplers
Embodiment
Now with reference to a plurality of embodiment embodiments of the present invention are described.
Need to prove that the present invention is not limited only to the foregoing description, these embodiment can make suitable modification in the scope of the technology of the present invention thought.
[embodiment 1]
Fig. 2 is the block diagram that illustrates according to first embodiment of the gain balance equipment 2 of submarine fiber cable of the present invention.In the optical transmission line 4 of submarine fiber cable system, a signal beams transmits by transmission line 4, and by first optical coupler 6 along separate routes, and a part of shunting sign light beam is received by light amplification parts 8.The output beam of these light amplification parts 8 is received by variable optical attenuation parts 10.Draw then by second optical coupler 12 from the light beam of variable optical attenuation parts 10 outputs.Yet obviously this optical transmission line has alternatively only at the optical isolator of folk prescription to transmit optical signals.The mode of the wavelength division multiplexing of the signal beams by having multi-wavelength produces signal beams.
Being transfused to side beam receiving circuit 14 by first optical coupler 6 another part input beam along separate routes receives.The signal that is transfused to 14 conversions of side beam receiving circuit is received by variable optical attenuation component controls circuit 16.Control signal from this variable optical attenuation component controls circuit 16 is received by variable optical attenuation parts 10.
Being output side beam receiving circuit 18 by second optical coupler 12 another part output beam along separate routes receives.Received by light amplification component controls circuit 20 by outlet side light beam receiving circuit 18 electrical signal converted.Control signal from light amplification component controls circuit 20 is received by light amplification parts 8.
First and second optical couplers 6 and 12 all are the light splitter components, and described smooth splitter component is a kind ofly to make luminous power by single optical fiber be shunted to specified ratio to flow in two optical fiber, or make the optical assembly that luminous power in two optical fiber is assembled on the contrary.
The photosemiconductor amplifier can be used as light amplification parts 8; But light amplification parts 8 comprise erbium-doped fiber amplifier or neodymium-doped fiber amplifier usually, and change in gain makes the gain tilt (Fig. 3) in a certain light signal frequency band.Gain tilt is to represent about the gradient in the chart that is exaggerated the input beam wavelength by relative gain.Along with the increase of light amplification parts gain, gain tilt diminishes and becomes negative value until it.Fig. 4 shows the gain tilt value about this light amplification parts gain qualitatively.Along with the increase of light amplification parts gain, gain tilt diminishes and becomes negative value until it.Just, the gain tilt in a certain light signal frequency band can be adjusted by the gain of adjusting the light amplification parts.Thereby the output of the exciting laser diode (LD) of light amplification parts controlled, make light be output as constant.
Variable optical attenuation parts 10 adopt one of following any method: by causing for example ND (neutraldensity, neutral density) move with respect to the machinery of optical axis the position of the attenuating light filter of filter, thereby change the method for decay, the decay of described attenuating light filter changes in the plane perpendicular to optical axis; Use the method for magneto optical effect; And the method that changes decay by the variation that employing depends on the bending loss of optical fiber of bending radius.For any wavelength, relative gain is with identical attenuation rate decay.Simultaneously, have by the variable optical attenuation parts 10 of the state of attenuation rate decision and select best state, make optical signal level difference optimum.
In Fig. 2, variable optical attenuation parts 10 are devices that a pad value changes along with electric current (or voltage), and can be only by using the control light signal change electric current (or voltage) from land terminal work station device to change pad value.
Input side light beam receiving circuit 14 and outlet side light beam receiving circuit 18 will convert the signal of telecommunication to by first optical coupler 6 and second optical coupler 12 light signal along separate routes respectively.
Variable optical attenuation component controls circuit 16 is the circuit of attenuation rate that utilize the output signal control variable optical attenuation parts 10 of input side light beam receiving circuit 14, wherein variable optical attenuation parts 10 are adjusted to select optimum state, make optical signal level difference optimization.Like this, as illustrated in fig. 5, optical attenuation increases continuously with the increase of Control current with being directly proportional.
The output of the LD that is energized of light amplification component controls circuit 20 control light amplification parts 8 makes light be output as constant.
Referring now to above-mentioned structure the submarine fiber cable gain equalizing method according to the embodiment of the invention 1 is described.
With reference to Fig. 2, the light signal that is received by light amplification parts 8 by second optical coupler 12 along separate routes; This shunt light signal of a part is transferred to outlet side light beam receiving circuit 18 and is used for its signal level detection; This detection signal is converted into the signal of telecommunication then.According to this signal of telecommunication, the LD that the is energized output of light amplification component controls circuit 20 control light amplification parts 8 makes light be output as constant.
Simultaneously, by first optical coupler 6 along separate routes from the light signal of land terminal work station device etc.; This shunt light signal of a part is transferred to input side light beam receiving circuit 14 and is used for its signal level detection; This detection signal is converted into the signal of telecommunication then.According to this signal of telecommunication, change the state of variable optical attenuation parts 10, make the attenuated optical signal that causes by these variable optical attenuation parts 10 change.Therefore the optical signal level that obtains optimally to meet optical signal level is poor.
Subsequently, under the sea, build and comprise before the system of gainequalizer, when measuring, adjust variable optical attenuation parts 10, thereby select optimum state to make optical signal level difference optimization from the optical signal level difference of output beam.Owing to carry out before this optimization is built under the sea, therefore the viability after building under the sea in this system does not need to safeguard, as long as this is because there is this system of electricity supply just to remain on fixing state.Even it should be noted that under the sea build after, still can be by revising this state from the control light signal of land terminal work station device, make the optical signal level optimization.
As discussed above, the present invention has following advantageous effects.
First effect is to obtain submarine fiber cable system optimal light signal level difference, and this is because adjust optical signal level before building when reality is confirmed modular character under the sea, and does not need to pre-estimate the characteristic of the module of use.
Second effect is to make the structure of control circuit simpler because gainequalizer has the electronic circuit that has a plurality of states, and when using the operator required do from these states, select the best.
The 3rd effect is the number of fibers that can reduce in the gainequalizer, and this is not select best method because the present invention has to adopt from a plurality of gain balance modules.In addition, owing to do not need to install those and may be left obsolete module, therefore can obtain one littler and have cost-benefit equipment.
And, can when eliminating, control variable optical attenuator from the image intensifer influence, and in response to output signal control image intensifer.
[embodiment 2]
Fig. 6 is the block diagram that illustrates according to the embodiment 2 of submarine fiber cable gain balance equipment 2 of the present invention.In the optical transmission line 4 of submarine fiber cable system, signal beams transmits by transmission line 4, and by first optical coupler 6 along separate routes, and a part of shunting sign light beam is received by the first variable optical attenuation parts 22.Received by light amplification parts 8 from the light beam of variable optical attenuation parts 22 outputs.Received by the second variable optical attenuation parts 24 from the light beam of light amplification parts 8 outputs.From the light beam of the second variable optical attenuation parts 24 output by second optical coupler 12 and be output.Therefore, obviously this optical transmission line has alternatively only at the optical isolator of folk prescription to transmit optical signals.The wavelength division multiplexing of the signal beams by having a plurality of wavelength produces signal beams.
Being transfused to side beam receiving circuit 14 by first optical coupler 6 another part input beam along separate routes receives.The signal that is transfused to 14 conversions of side beam receiving circuit receives by first wavelength filter 26 and by variable optical attenuation component controls circuit 16.Received by the first variable optical attenuation parts 22 and the second variable optical attenuation parts 24 from the control signal of variable optical attenuation component controls circuit 16 outputs.
Being output side beam receiving circuit 18 by second optical coupler 12 another part output beam along separate routes receives.Pass through second wavelength filter 28 by outlet side light beam receiving circuit 18 electrical signal converted, and received by light amplification component controls circuit 20.The control signal of light amplification component controls circuit 20 outputs is received by light amplification parts 8.
Be similar to embodiment 1, the first and second variable optical attenuation parts 22 and 24 adopt any of following method: move with respect to the machinery of optical axis the position by causing the attenuating light filter of ND filter for example, thereby change the method for decay, the decay of described attenuating light filter changes in the plane perpendicular to optical axis; Use the method for magneto optical effect; And the method that changes decay by the variation that employing depends on the bending loss of optical fiber of bending radius.For each wavelength, relative gain is with identical attenuation rate decay.Simultaneously, have by the first and second variable optical attenuation parts 22 and 24 of the state of attenuation rate decision and select best state, make optical signal level difference optimum.In addition, be different from the front and back part that 1, two variable optical attenuation parts of embodiment are connected to light amplification parts 8, make input beam to decay better; In addition, can adjust the input beam that is received by the light amplification parts, make and to adjust gain tilt better.
And first and second wavelength filter 26 and 28 installation can be eliminated the noise of control signal.
Now with reference to said structure the submarine fiber cable gain equalizing method according to the embodiment of the invention 2 is described.
With reference to Fig. 6, received by light amplification parts 8 by the input beam of the first variable optical attenuation parts, 22 decay of front; By the light signal of light amplification parts 8 receptions along separate routes by second optical coupler 12; This shunt light signal of a part is transferred to outlet side light beam receiving circuit 18 and is used to detect its signal level; The signal of this detection is converted into the signal of telecommunication then, and this signal of telecommunication arrives light amplification component controls circuit 20 by second wavelength filter 28.Light amplification component controls circuit 20 makes light be output as constant according to the output of the LD that is energized of the level signal control light amplification parts 8 that detect.
Simultaneously, by first optical coupler 6 along separate routes from the light signal of land terminal work station device etc.; This shunt light signal of a part is transferred to input side light beam receiving circuit 14 and is used to detect its optical signal level; This detection signal is converted into the signal of telecommunication then.According to this signal of telecommunication, variable optical attenuation parts 22 and 24 state are changed, and make the decay of the light signal that caused by variable optical attenuation parts 22 and 24 be changed.Therefore the optical signal level that has obtained to meet best optical signal level is poor.
Subsequently, under the sea, build and comprise before the system of gainequalizer, in the optical signal level difference of measuring from output beam, adjust the first and second variable optical attenuation parts 22 and 24, select optimum state to make optical signal level difference optimization thus.Owing to carry out before this optimization is built under the sea, therefore the service device after building under the sea in this system does not need to safeguard, as long as this is because there is this system of electricity supply just to remain on fixing state.Even it should be noted that under the sea install after, still can be by revising this state, so that the optical signal level optimization from the control light signal of land terminal work station device.
As discussed above, the present invention has following advantageous effects.
First effect be can obtain for the optical signal level of submarine fiber cable system the best poor, this be because before under the sea, building when reality is confirmed modular character, owing to increased the quantity of variable optical attenuation parts, optical signal level is adjusted better, and does not need to pre-estimate the characteristic of the module of use.
Second effect is to make the structure of control circuit simpler because gainequalizer has the electronic circuit that has a plurality of states, and when using the operator required do from these states, select the best.
The 3rd effect is the number of fibers that can reduce in the gainequalizer, and this is not select best method because the present invention has to adopt from a plurality of gain balance modules.In addition, owing to do not need to install those and may be left obsolete module, therefore can obtain one littler and have cost-benefit equipment.
And, can be when eliminating from the image intensifer influence may command variable optical attenuator, and in response to output signal control image intensifer.
[embodiment 3]
Fig. 7 is the block diagram that illustrates according to the embodiment 3 of submarine fiber cable gain balance equipment 2 of the present invention.Obviously be different among the embodiment 2 is that only the part in light amplification parts 8 fronts provides variable optical attenuation parts 22.Basic identical among further feature and the embodiment 2.
[embodiment 4]
Fig. 8 is the block diagram that illustrates according to the embodiment 4 of submarine fiber cable gain balance equipment 2 of the present invention.What obviously be different from embodiment 2 is do not have wavelength filter in the part of outlet side light beam receiving circuit 18 back, and wavelength filter 26 to be installed in the aft section of input side light beam receiving circuit 14.Basic identical among further feature and the embodiment 2.
[embodiment 5]
Fig. 9 is the block diagram that illustrates according to the embodiment 5 of submarine fiber cable gain balance equipment 2 of the present invention.What obviously be different from embodiment 2 is, do not have wavelength filter in the aft section of input side light beam receiving circuit 14, and wavelength filter 28 is installed in the aft section of outlet side light beam receiving circuit 18.Basic identical among further feature and the embodiment 2.
[embodiment 6]
Figure 10 is the block diagram that illustrates according to the embodiment 6 of submarine fiber cable gain balance equipment 2 of the present invention.In the optical transmission line 4 of submarine fiber cable system, signal beams transmits by transmission line 4, and respectively by first and second optical couplers 30 and 32 along separate routes; Part shunting sign light beam is received by the first variable optical attenuation parts 22.Received by light amplification parts 8 from the light beam of the first variable optical attenuation parts, 22 outputs.Received by the second variable optical attenuation parts 24 from the light beam of light amplification parts 8 outputs.The light beam of the second variable optical attenuation parts 24 output is by the 3rd optical coupler 34 and be output.Therefore, obviously this optical transmission line has alternatively only at the optical isolator of folk prescription to transmit optical signals.The wavelength division multiplexing of the signal beams by having a plurality of wavelength produces signal beams.
Received by the first and second smooth latch cicuits 36 and 38 simultaneously as the light reset signal by first optical coupler 30 signal beams along separate routes.
Being transfused to side beam receiving circuit 14 by second optical coupler 32 another part output beam along separate routes receives.Pass through first wavelength filter 26 and the first smooth latch cicuit 36 by input side light beam receiving circuit 14 electrical signal converted, and received by variable optical attenuation component controls circuit 16.Control signal from variable optical attenuation component controls circuit 16 is received by the first and second variable optical attenuation parts 22 and 24.
Being output side beam receiving circuit 18 by the 3rd optical coupler 34 another part output beam along separate routes receives.Pass through second wavelength filter 28 and the second smooth latch cicuit 38 by outlet side light beam receiving circuit 18 electrical signal converted, and received by light amplification component controls circuit 20.Control signal from light amplification component controls circuit 20 is received by light amplification parts 8.
First, second and the 3rd optical coupler 30,32 and 34 all are the light splitter components, described smooth splitter component is a kind ofly to make luminous power by single optical fiber be shunted to specified ratio to flow in two optical fiber, or makes the optical assembly that luminous power in two optical fiber is assembled on the contrary.
The first and second smooth latch cicuits 36 and 38 all are to latch the signal that received until the circuit that receives the light reset signal, and wherein each of these latch cicuits keeps respectively from variable optical attenuation component controls circuit 16 with from the control signal of light amplification component controls circuit 20.Each light latch cicuit comprises piezoelectric element, Mach-Zehnder interferometer etc.And each light latch cicuit can comprise photodiode, makes signal be latched with the form of the signal of telecommunication.
Now with reference to said structure, the method according to the submarine fiber cable gain balance of the embodiment of the invention 3 is described.
With reference to Figure 10, received by light amplification parts 8 by the input signal of the front first variable optical attenuation parts, 22 decay; By the light signal of light amplification parts 8 receptions along separate routes by second optical coupler 12; This shunt light signal of a part is transferred to the detection that outlet side light beam receiving circuit 18 is used for its signal level; And this detection signal is converted into the signal of telecommunication, and this signal of telecommunication arrives light amplification component controls circuit 20 then by second wavelength filter 28 and the second smooth latch cicuit 38.Light amplification component controls circuit 20 makes light be output as constant according to the output of the LD that is energized of these signal of telecommunication control light amplification parts 8.The signal that is kept by the second smooth latch cicuit 38 has been the signal that latch cicuit 38 receives for the first time since this latch cicuit 38 receives the light reset signal, and this inhibit signal is transferred to light amplification component controls circuit 20.
Simultaneously, by second optical coupler 32 along separate routes from the light signal of land terminal work station device etc.; This shunt light signal of a part is transferred to input side light beam receiving circuit 14 and is used for its signal level detection; This detection signal is converted into the signal of telecommunication then, and this signal of telecommunication arrives variable attenuation control circuit 16 then by first wavelength filter 26 and the first smooth latch cicuit 36.Variable attenuation control circuit 16 changes by variable optical attenuation parts 22 and 24 attenuated optical signals that cause.Thereby the optical signal level that has obtained optimally to meet optical signal level is poor.The signal that is kept by the first smooth latch cicuit 36 has been the signal that latch cicuit 36 receives for the first time since this latch cicuit 36 receives the light reset signal, and this inhibit signal is transferred to variable optical attenuation component controls circuit 16.
Subsequently, under the sea, build and comprise before the system of gainequalizer, when measuring, adjust variable optical attenuation parts 22 and 24, select optimum state to make optical signal level difference optimization thus from the optical signal level difference of output beam.Owing to carry out before this optimization is built under the sea, therefore the viability after building under the sea in this system does not need to safeguard, as long as this is because there is this system of electricity supply just to remain on fixing state.Even it should be noted that under the sea build after, still can be by revising this state, so that the optical signal level optimization from the control light signal of land terminal work station device.
In this case, be held in case be used to control the control signal of variable optical attenuation component controls circuit 16 and light amplification component controls circuit 20, this control signal that receives just is held, until receiving next light reset signal.
As discussed above, the present invention has following advantageous effects.
First effect is because before building under the sea, when reality is confirmed modular character, because the increase of variable optical attenuation number of components, and do not need to pre-estimate the characteristic of the module of use, light signal is better adjusted, and it is poor therefore can to obtain for the optical signal level of submarine fiber cable system the best.
Second effect is to make the structure of control circuit simpler, because gainequalizer has the electronic circuit that has a plurality of states, and selection the best from these states that operator institute must do when using.
The 3rd effect is the number of fibers that can reduce in the gainequalizer, and this is not select best method because the present invention has to adopt from a plurality of gain balance modules.In addition, owing to do not need to install those and may be left obsolete module, therefore can obtain one littler and have cost-benefit equipment.
And, can when eliminating, control variable optical attenuator from the image intensifer influence, and in response to output signal control image intensifer.
In addition, the installation of light latch cicuit makes it possible to keep more definitely a certain state.
With reference to specific preferred embodiment, the present invention is described in detail, but is appreciated that these embodiment just wish with the explanation the present invention of its instantiation rather than restriction the present invention.Obviously, for those skilled in the art, read specification of the present invention after, by using some assembly that is equal to or technology, can easily carry out multiple variation and substitute; Yet, obviously these variations and to substitute also be to cover in the design of claims and the scope.
Industrial applicibility
Needless to say, the invention provides the gain equilibrium of reliable Fiber Optical Submarine Cable System, and the present invention is suitable for Cable system in the employing optical fiber of other type.
Claims (12)
1, a kind of gain equalizing method of submarine fiber cable, wherein light amplification parts and optical attenuation parts are connected on the optical transmission line of this submarine fiber cable, and wherein said method comprises following steps:
On the first smooth splitter component, go out a part along separate routes from the output of optical attenuation parts;
On outlet side light beam receiving-member, receive shunt light signal from the described first smooth splitter component;
On the light amplification control assembly, in response to from the signal of described outlet side light beam receiving-member and control the state of described light amplification parts;
On the second smooth splitter component, go out a part along separate routes from input beam;
On input side light beam receiving-member, receive shunt light signal from the described second smooth splitter component;
On the optical attenuation control assembly, in response to from the signal of described input side light beam receiving-member and control the state of described optical attenuation parts;
On described light amplification component controls parts, select a state, be output as a constant at light amplification parts described in this state; And
On described optical attenuation control assembly, select a state, the optical signal level that has expectation in the output of optical attenuation parts described in this state is poor.
2, the gain equalizing method of submarine fiber cable as claimed in claim 1, wherein the optical attenuation parts are connected to before the described light amplification parts and part afterwards, and wherein this method also comprises following steps: select a state, the optical signal level that has expectation in the output of optical attenuation parts described in this state is poor.
3, the gain equalizing method of submarine fiber cable as claimed in claim 1 also comprises the steps: be connected to receiving beam received signal on the described input side light beam receiving circuit of described optical attenuation control assembly via wavelength filter.
4, the gain equalizing method of submarine fiber cable as claimed in claim 1 also comprises the steps: be connected to receiving beam received signal on the described outlet side light beam receiving circuit of described light amplification control assembly via a wavelength filter.
5, the gain equalizing method of submarine fiber cable as claimed in claim 3, also comprise maintenance from the signal of described input side light beam receiving-member until the step that receives next light reset signal, wherein said wavelength filter is connected to described optical attenuation control assembly via the light latch cicuit.
6, the gain equalizing method of submarine fiber cable as claimed in claim 5, wherein said smooth reset signal is the signal that goes out along separate routes from input beam.
7, a kind of gain balance equipment of submarine fiber cable comprises:
The first smooth splitter component, its shunt is from the part of the output of optical attenuation parts, and light amplification parts and described optical attenuation parts are connected to the optical transmission line of submarine fiber cable;
Outlet side light beam receiving-member, it receives the shunt light signal from the described first smooth splitter component;
The light amplification control assembly, it is in response to from the signal of described outlet side light beam receiving-member and control the state of described light amplification parts;
The second smooth splitter component, it is the part of input beam along separate routes;
Input side light beam receiving-member, it receives the shunt light signal from the described second smooth splitter component; With
The optical attenuation control assembly, it is in response to from the signal of described input side light beam receiving-member and control the state of described optical attenuation parts,
Wherein said light amplification control assembly is selected a state, is output as constant at light amplification parts described in this state, and
Wherein said optical attenuation control assembly is selected a state, and the optical signal level that has expectation in the output of optical attenuation parts described in this state is poor.
8, the gain balance equipment of submarine fiber cable as claimed in claim 7, wherein the optical attenuation parts are connected to before the described light amplification parts and part afterwards, make that a state is selected, in this state, it is poor that the output of described optical attenuation parts has the optical signal level of expectation.
9, the gain balance equipment of submarine fiber cable as claimed in claim 7, wherein said input side light beam receiving circuit is connected to described optical attenuation control assembly via wavelength filter, and wherein said input side light beam receiving circuit receiving beam received signal.
10, the gain balance equipment of submarine fiber cable as claimed in claim 7, wherein said outlet side light beam receiving circuit is connected to described light amplification control assembly via wavelength filter, and wherein said outlet side light beam receiving circuit receiving beam received signal.
11, the gain balance equipment of submarine fiber cable as claimed in claim 9, wherein said wavelength filter is connected to described light amplification control assembly via the light latch cicuit, and wherein keep signal, until receiving next light reset signal from described input side light beam receiving-member.
12, the gain balance equipment of submarine fiber cable as claimed in claim 11, wherein the light reset signal is the signal that goes out along separate routes from input beam.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007081511A JP5003878B2 (en) | 2007-03-27 | 2007-03-27 | Submarine cable gain equalization method and gain equalization apparatus |
| JP2007-081511 | 2007-03-27 |
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| Publication Number | Publication Date |
|---|---|
| CN101309117A true CN101309117A (en) | 2008-11-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810100347 Pending CN101309117A (en) | 2007-03-27 | 2008-03-27 | Method and device for gain balance of submarine fiber cable |
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| Country | Link |
|---|---|
| JP (1) | JP5003878B2 (en) |
| CN (1) | CN101309117A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111801903A (en) * | 2018-02-27 | 2020-10-20 | 日本电气株式会社 | Equalizer device, communication system, and equalizing method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005192256A (en) * | 1998-03-19 | 2005-07-14 | Fujitsu Ltd | Device, method, optical amplification device, and optical communication system |
| JP2001168841A (en) * | 1999-12-09 | 2001-06-22 | Nec Corp | Wavelength multiplex optical amplifier |
| JP3938270B2 (en) * | 2000-06-29 | 2007-06-27 | 三菱電機株式会社 | Optical repeater amplifier |
| JP2003348017A (en) * | 2002-05-29 | 2003-12-05 | Nec Corp | Variable gain equalizer and method for monitoring remote control gain equalization |
| JP4084144B2 (en) * | 2002-09-10 | 2008-04-30 | 富士通株式会社 | Optical amplifier |
| JP4414800B2 (en) * | 2004-03-25 | 2010-02-10 | 株式会社日立コミュニケーションテクノロジー | Optical transmission apparatus and control method thereof |
-
2007
- 2007-03-27 JP JP2007081511A patent/JP5003878B2/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111801903A (en) * | 2018-02-27 | 2020-10-20 | 日本电气株式会社 | Equalizer device, communication system, and equalizing method |
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| Publication number | Publication date |
|---|---|
| JP2008244759A (en) | 2008-10-09 |
| JP5003878B2 (en) | 2012-08-15 |
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