CN1538654A - Mixed type dynamic light gain equilibrium method used in WDM system - Google Patents
Mixed type dynamic light gain equilibrium method used in WDM system Download PDFInfo
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- CN1538654A CN1538654A CNA2003101112612A CN200310111261A CN1538654A CN 1538654 A CN1538654 A CN 1538654A CN A2003101112612 A CNA2003101112612 A CN A2003101112612A CN 200310111261 A CN200310111261 A CN 200310111261A CN 1538654 A CN1538654 A CN 1538654A
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Abstract
A method of dynamic spectrum equalization for WDM system includes such step as Passing through wave splitter device, optical signal is divided into M groups of optical wave, and each group includes Ni pieces of wavelengths (number of wavelengths may be different according to need of system). Gain equilibration process is carried out for Ni pieces of wavelengths by using dynamic gain flatten filter. Then, through wave merge device, the Ni pieces of wavelengths in M groups are coupled to optical fiber. The advantages are making full use of tchnique of Dynamic Channel Equalization and technique of Dynamic Spectrum Equalization, and prevents their disadvantages.
Description
Technical field:
The present invention relates to a kind of hybrid dynamic gain of light equalization methods that is used for wdm system, belong to the optical communication technique field, be in wavelength division multiplexing (WDM) system, particularly in dense wave division multipurpose (DWDM) communication system, be used for that the unevenness of the gain of light is carried out dynamic equalization and handle.
Background technology:
Along with a large amount of uses of EDFA product and wdm system, EDFA is widely used in the long distance D wdm system, so that simultaneously multiple wavelength optical signal is amplified.But, cause the gain spectral unevenness of EDFA because EDFA has different gain saturation characteristics to the different wave length signal; Particularly after a plurality of EDFA cascades, this unevenness makes each wavelength signals produce different gains, thereby causes some channels to produce serious error code, and OSNR significantly descends; And then the whole system performance declines to a great extent, and light signal is subjected to limiting greatly in the transmission range of communication system.Simultaneously, in main line and distributed network, on/random fluctuation of drop Voice Channel or channel power can cause the imbalance of each channel power, this channel power is unbalance to cause the whole system cisco unity malfunction the most at last.So must introduce luminous power (gain) balancing technique.
Use the method for dynamic gain of light balancing technique that DCE technology (UnitedStates Patent 20030053754A1) and DSE technology (United States Patent20020093725A1) are arranged at present.
A kind of dynamic gain of light balancing technique is that the dynamic gain of light balancing technique of encapsulating type is the DSE technology.Its essence is a plurality of optic tunable filters of cascade, form a gain of light spectrum opposite, and reach the dynamic equalization of the gain of light with primary signal.As acousto-optic filter, liquid crystal optical filter, Mach-Zehnder (Mach-Zehnder) Waveguide interference instrument filter etc.
In order to handle the gain of light of whole wave band (as C or L-band), need a plurality of filters of cascade (as 8-14, even more).Bigger insertion loss (IL), Polarization Dependent Loss (PDL), polarization mode dispersion (PMD) have been introduced thus; Because the cascade of too many filter causes increasing of optics discrete component, the light path design complexity has been introduced more loss and chromatic dispersion, and then makes many optical indexes degenerate simultaneously.
If but reduce the number of filter, then do not reach the effect of gain balance, the slope-compensation of gain is had only 1-2dB/nm; Kong Zhi precision is not high yet simultaneously, and the gain unevenness degree after the equilibrium is very big (as Ripple＞1.0dB).
So the effect of gain balance (need the number of filter The more the better) with introduce the implacable contradiction that loss, chromatic dispersion, (number of cascading filter is few more good more) have formed the DSE technology.
Another distinct issues of DSE technology are realizations of FILTER TO CONTROL, promptly regulate the parameter of optical filter dynamically.Generally speaking, each filter has amplitude, centre wavelength, 3 parameters of bandwidth, as required 10 (or more) filters among the United States Patent 20020093725A1.When then carrying out the filter adjusting at every turn, need 30 (or more) parameters are optimized processing, this has proposed very high requirement on software control algorithm, make amount of calculation increase greatly, thereby caused hardware circuit complicated more, and the increase of final response time index. as carrying out multi-variable function optimization with genetic algorithm, the time of then searching for the most optimized parameter, this time was unacceptable in high speed optical communication system in level second.
These distinct issues explanations DSE technology is not a kind of optimal dynamic gain of light balancing technique.
Another kind of dynamically gain of light balancing technique is that the dynamic gain of light balancing technique of channel-style is DCE technology (United States Patent 20030053754A1).Its essence is that the optical signal gain to each passage (wavelength) carries out equilibrium control.
Its basic skills is at first light signal to be carried out partial wave, again each wavelength light signal gain is carried out equilibrium control, after close ripple.As 40,80,160 wavelength light signals are carried out dynamic equalization, then need wave splitter device at first light signal to be divided into 40,80,160 wavelength, the dynamic equalization of using 40,80,160 passage light (wavelength) gain balance control units (attenuator) to carry out the gain of light then.So this scheme needs a large amount of branch (closing) ripple device and attenuator, bulky, cost is very high, complex process.
Moreover, the dynamic gain of light balancing technique of channel-style, promptly another significant disadvantages of DCE technology be what to introduce-insert loss IL very high (as dielectric film filter deciliter ripple mode).
Therefore in view of the shortcoming of DCE technology and DSE technology, and utilize their advantages separately, proposed a kind of new method and system of photokinesis gain balance.
Summary of the invention:
The objective of the invention is to utilize their advantages separately, proposed a kind of hybrid dynamic gain of light equalization methods that is used for optical wavelength-division multiplex (WDM) system.At first will contain multiple wavelength optical signal is divided into many group wavelength (every group of number of wavelengths can be identical, also can be different, can come flexible configuration by the requirement of system), adopt dynamic gain of light flat filter DGFF every group of wavelength to be carried out the dynamic compensation of gain of light slope then.
Technical scheme of the present invention: the hybrid dynamic gain of light equalization methods that is used for wdm system at first carries out partial wave with light signal by wave splitter device, is divided into M group ripple, and every group contains N
1Individual wavelength uses dynamic gain of light flat filter DGFF to this N again
1Wavelength carries out equilibrium treatment, after the processing this M is organized N
1Individual wavelength signals is coupled in the optical fiber through composite wave appts.
Described hybrid dynamic gain of light equalization methods, every group contains 4-20 wavelength light signal.Every group of contained number of wavelengths can equate or not wait.
Described hybrid dynamic gain of light equalization methods, partial wave with close ripple and adopt channel-splitting filter and wave multiplexer based on dielectric film filter TFF structure.
Described hybrid dynamic gain of light equalization methods, partial wave with close ripple and adopt partial wave, the wave multiplexer that adds the circulator structure based on optical fiber bragg grating FBG.
Described hybrid dynamic gain of light equalization methods, partial wave with close ripple adopt based on the partial wave of array fiber waveguide AWG structure with close the ripple mode.
Described hybrid dynamic gain of light equalization methods, partial wave with close ripple and intersect wavelength division multiplexer Interleaver by light and form channel-splitting filter and wave multiplexer.
Described hybrid dynamic gain of light equalization methods, for based on the partial wave of array fiber waveguide AWG structure with close the ripple mode, its dynamic gain of light flat filter is made up of the Mach-Zehnder Waveguide interference instrument filter based on hot optical tech.
Dynamic gain of light flat filter DGFF in the system of other hybrid dynamic gain of light equilibrium can adopt: filter, Fiber Bragg Grating FBG (FBG) filter, magneto-optic technology tunable optic filter that acousto-optic tunable filter, liquid crystal tunable filter, Mach-Zehnder (Mach-Zehnder) Waveguide interference view are formed.
Deciliter ripple advantage of this hybrid Dynamic Gain Equalizer method is:
Do not need with
The light of individual wavelength signals specifically is divided into
Individual independently wavelength.Light signal as 160 wavelength only need be divided into 16 groups of wavelength, rather than 160 wavelength, and along with the further application of close wavelength-division multiplex technology (DWDM), the channel wavelength number is more and more, and this hybrid Dynamic Gain Equalizer method and system will embody bigger advantage.The IL of Yin Ruing reduces (size of IL is a key issue of gain of light equalizing device, and generally IL is very big) greatly thus.
Light partial wave (the closing ripple) technology that occurs in the just present optical communication system, great majority are based upon: wavelength signals is carried out telling certain wavelength after transmission, the reflection.Because light signal has the loss of luminous power in transmission, reflection process, promptly be to insert loss, and along with the cascade additive effect of IL in partial wave (closing ripple).Finally cause the IL of partial wave (closing ripple) device to increase greatly.As right
Individual wavelength light signal carries out branch (closing) ripple, and the IL that transmission each time, reflection are introduced is a (dB).Then:
IL
Mixed type=M*a (dB)
H: partial wave coefficient
H＜N generally
1So, IL
Channel-style＞IL
Mixed type
Therefore the IL of this hybrid gain of light equalizing system is very little.On PDL, PMD index, similar characteristic is arranged also equally.And because the minimizing of partial wave (closing ripple) device makes that this system cost is low, volume is little.
DGFF in this hybrid dynamic gain of light equalizing system adopts the gain slope compensation technique.If the flashlight gain is G (λ
j), the gain compensation function is F (x
j, λ), reach gain function is H (λ
j), then dynamically the control function of gain of light equilibrium is:
H(λ
j)＝F(x
j，λ
j)+G(λ
j) j＝1，2，3……，N
i。i＝1，2，3……，M。
x
j: the Control Parameter of gain of light flat filter
The characteristics of DGFF are in this hybrid dynamic gain of light equalizing system: the gain of light is compensated in the mode of wavelength interval (dB/nm), can realize the gain slope compensation of single wavelength, and the compensation of each wavelength can reaches 3-6dB.That is to say that this compensation way can obtain as the effect that each passage is compensated in the DCE technology.Accompanying drawing 8,9 has shown the result of compensation, and as can be seen from the figure maximum gain compensation slope is that the balanced flatness of the 5dB/0.8nm. and the gain of light is very high, can be controlled in the 0.3dB, specifically sees accompanying drawing 8,9.Simultaneously because (DGFF) based on very a spot of filter, so the IL that introduces, PDL, PMD are less.Thereby make the IL of whole system, PDL, the PMD index diminishes.
This in a word new method and system can give full play to partial wave (the closing ripple) advantage of DCE technology, also can utilize the gain of light treatment technology advantage of DSE technology, and avoid their shortcomings separately.Make that this system cost reduces, volume reduces, and very big advantage is being arranged on as IL, PDL, PMD on a lot of indexs: far below the DCE technology, control effect on the cost far above the DSE technology.
Description of drawings:
Fig. 1 is a hybrid dynamic gain of light equalizing system overall construction drawing of the present invention;
Figure 2 shows that the embodiment of the invention one: dielectric film filter deciliter ripple mode gain of light equalizing system overall construction drawing;
Figure 3 shows that the embodiment of the invention two: optical fiber bragg grating FBG adds circulator deciliter ripple mode gain of light equalizing system overall construction drawing;
Figure 4 shows that two deciliters ripple modes of embodiment structure chart;
Figure 5 shows that the embodiment of the invention three: AWG deciliter ripple mode gain of light equalizing system overall construction drawing;
Figure 6 shows that gain balance cellular construction figure among the embodiment three;
Figure 7 shows that the embodiment of the invention four: utilize light intersection wavelength division multiplexer (Interleaver) deciliter ripple mode gain of light equalizing system overall construction drawing;
Figure 8 shows that the oscillogram of liquid crystal tunable filter gain balance unit to 8 wavelength gain compensations;
Fig. 9 is C-band 50GHZ interval, 80 wavelength light signals, adopts the dynamic gain of light equalizing system gain balance oscillogram of dielectric film filter deciliter ripple mode, liquid crystal filter gain balance technology.
Embodiment:
As shown in Figure 1: the present invention has provided the system of this hybrid dynamic gain of light equilibrium.It at first carries out partial wave with light signal by wave splitter device, can be divided into M group ripple, and every group contains N
iIndividual wavelength, again with DGFF to this N
iWavelength carries out equilibrium treatment, after the processing this M is organized N
1Individual wavelength signals is coupled in the optical fiber (1≤i≤M) through composite wave appts.
Embodiment one:
Fig. 2 adopts dielectric film filter deciliter ripple mode and DGFF gain balance treatment system general structure device for the present invention.N wavelength light signal is through 2.1 couples of n1 (N of 1st grade of deciliter ripple gain balance processing unit on the whole
1) individual wavelength light signal carries out gain of light equilibrium treatment, 2.2 couples of n2-n1 (N of the 2nd grade of deciliter ripple gain balance processing unit
2) individual wavelength light signal carries out gain of light equilibrium treatment, up to i level deciliter ripple gain balance processing unit 2.i to n-n
i(N
i) individual wavelength light signal carries out gain of light equilibrium treatment, finally finishes the gain balance to n wavelength light signal.Wherein 2.1 devices are made up of 2.11 (twin-core collimaters), 2.12 (dielectric film filters: as channel-splitting filter), 2.13 (DGFF), 2.14 (single core collimater); 2.2 device is made up of 2.21 (twin-core collimaters), 2.22 (dielectric film filters: as channel-splitting filter), 2.23 (DGFF), 2.24 (dielectric film filter: as wave multiplexer), 2.25 (twin-core collimaters); Wherein the 2.i device is made up of 2.i1 (single core collimater), 2.i2 (DGFF), 2.i3 (dielectric film filter: as wave multiplexer), 2.i4 (twin-core collimater).
Detailed process is: at first n wavelength light signal first core input from 2.11, transmit n1 wavelength light signal through 2.12, and this n1 wavelength light signal carries out the gain balance processing through 2.13, after 2.14 collimate and enter 2.2.Other wavelength light signal reflects from 2.11 second core through 2.12 and outputs to 2.2, carry out the gain balance processing 2.22 tell n2-n1 wavelength light signal through 2.23, other wavelength light signal that reflects is exported from 2.21 second core, and n1 wavelength light signal after handling from 2.14 gain balances of exporting synthesizes one road light signal (containing n2 wavelength) through 2.25 to 2.24 with n2-n1 the wavelength light signal of handling from 2.23 gain balances and export from 2.25 second core.I level deciliter ripple gain balance processing unit to the last, the n-n that the 2.i1 input is last
iIndividual wavelength light signal is handled through the 2.i2 gain balance, by 2.i3 and the preceding n that imports from 2.i4 first core
iSynthetic n the wavelength light signal of wavelength light signal behind the individual gain balance is from second core output of 2.i4.Promptly finish the equilibrium of n wavelength light signal gain.
DGFF gain of light equilibrium treatment unit among this embodiment can adopt technology such as filter that acousto-optic tunable filter, liquid crystal tunable filter, Mach-Zehnder (Mach-Zehnder) Waveguide interference instrument form, Fiber Bragg Grating FBG (FBG) filter, magneto-optic tunable optic filter.
Adopt liquid crystal tunable filter technology DGFF that C-band 50GHz 80 wavelength light signals are at interval carried out gain balance in this embodiment and handle (n=80).We adopt 10 grades of dielectric film filter channel-splitting filters (M=10), and every grade of light signal is divided into 8 wavelength light signal (N through dielectric film filter channel-splitting filter
1=N
2=...=N
10=8), every grade of light signal is through gain of light equilibrium treatment module gain equilibrium treatment, after the ripple that closes at different levels synthesizes the output of one road light signal then.
Only need a 2=18 dielectric film filter of (10-1) * just can finish branch/close ripple among this embodiment, need (80-1) * 2=158 dielectric film filter then in the DCE system is so can reduce cost greatly and volume; The IL of Yin Ruing, PDL, PMD are less simultaneously.For example:
IL
Mixed type=10*a (dB)
H: the partial wave coefficient,
So h＜8 generally are IL
Channel-style＞IL
Mixed type
DGFF adopts the filter based on liquid crystal technology that equilibrium is carried out in the gain of light of every group of 8 wavelength signals among this embodiment.Be actually the voltage at dynamic adjustments liquid crystal the two poles of the earth, promptly constantly change the centre wavelength and the amplitude of filter, draw different filtering waveforms.
This DGFF uses simple optimized Algorithm just can realize the dynamic compensation of gain slope.If the gain of primary light signal is G (λ
1, λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8), the function of gain flattening filter is F (x
1, x
2, x
3, x
4, x
5, x
6, x
7, x
8, λ), the gain balance function that reach is H (λ
1, λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8).Then the control function of gain balance is:
H(λ
1，λ
2，λ
3，λ
4，λ
5，λ
6，λ
7，λ
8)
＝F(x
1，x
2，x
3，x
4，x
5，x
6，x
7，x
8，λ)+G(λ
1，λ
2，λ
3，λ
4，λ
5，λ
6，λ
7，λ
8)
By dynamic adjustments liquid crystal filter parameter (x
1, x
2X
8, what reality was corresponding is the different magnitudes of voltage in liquid crystal the two poles of the earth, makes the flatness of gain balance reach best.
The gain slope compensation process of this gain slope dynamic compensation technology is: the optical signal gain G (λ that optical power detector (OPM) is fed back
1, λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8), subtract each other with our desired gain, draw each wavelength correspondence gain of light offset (unit: dB/nm), i.e. the offset of gain slope.The application simple algorithm is handled, and control DGFF regulates its parameter x
1, x
2X
8, the gain of every wavelength is compensated.This DGFF can realize the gain slope compensation of single wavelength, and this is its distinguishing feature.
In an embodiment, the compensation slope of each wavelength can be controlled in 3-6dB.Flatness behind the gain balance is very high, and in 0.3dB, and the dynamic range of gain of light equilibrium is up to 20dB.
Figure 8 shows that based on the DGFF gain balance unit of liquid crystal tunable filter technology oscillogram 8 wavelength gain compensations.
Fig. 9 is the oscillograms of whole 80 wavelength light signals behind gain balance.Because IL, PDL, PMD that this DGFF introduces are very little, make IL, PDL, the PMD of whole system reduce greatly simultaneously.
The advantage of this embodiment each side has well embodied the superiority of hybrid dynamic gain of light equalization methods and system.
Embodiment two:
Fig. 3 is the second embodiment overall structure figure, and wherein channel-splitting filter (3.1) and wave multiplexer (3.3) adopt the device that optical fiber bragg grating FBG (3.1A) and circulator (3.1B) combine.As shown in Figure 4: PortA is the circulator input, and PortC is an output, and PortB is the reflection end of FBG, and PortD is the transmission end of FBG.At first n wavelength light signal told n1 wavelength light signal through the first order 3.11 reflections, the remaining wavelength light signal through the first order 3.11 transmissions enters the second level 3.12, n2 wavelength light signal told in reflection again, and so continuous partial wave to the last one group of wavelength light signal is told; One group of optical wavelength signal at every turn telling enters 3.2 (DGFF gain of light equilibrium treatment unit) at the corresponding levels respectively; Close ripple, synthetic one road light signal output of one-level 3.3M to the last through at the corresponding levels 3.3 again through 3.2 every group of wavelength light signals handling.But this device in after the first order 3.21 gain process, do not need composite wave appts, and directly enter down 3.32 (second level wave multiplexers); Do not need channel-splitting filter in the afterbody (M level), directly import the light signal that upper level is told, enter 3.2M (M level DGFF) gain balance.
DGFF gain of light equilibrium treatment unit among this embodiment can adopt technology such as filter that acousto-optic tunable filter, liquid crystal tunable filter, Mach-Zehnder (Mach-Zehnder) Waveguide interference instrument form, Fiber Bragg Grating FBG (FBG) filter, magneto-optic tunable optic filter.
Embodiment three:
Fig. 5 is the 3rd embodiment overall structure figure, and wherein channel-splitting filter 4.1 adopts array waveguide grating AWG structure with wave multiplexer 4.3.At first n wavelength light signal is divided into many group optical wavelength signals through array waveguide grating 4.1, and every group light wave long number can be different.As first group is N
1Individual wavelength light signal, second group is N
2Individual wavelength light signal, every group of light signal carries out gain balance through DGFF gain balance unit 4.21-4.2M, after export after closing ripple through 4.3 again.
Wherein 4.2 form among this embodiment, can select the number of cascade 4.2A according to the number of wavelengths of every group of equilibrium treatment, as shown in Figure 6 by Mach-Zehnder (Mach-Zehnder) Waveguide interference instrument filter 4.2A based on hot optical tech.
Embodiment four:
Fig. 7 is the 4th embodiment overall structure figure, wherein channel-splitting filter and wave multiplexer intersect wavelength division multiplexer (Interleaver) by light and form, used optical wavelength signal is divided into odd term and even number item wavelength light signal through light intersection wavelength division multiplexer 5.1A, 5.2A, 5.3A (corresponding different wave length Interleaver) respectively, afterbody is told a plurality of wavelength light signals, carrying out gain balance through 5.4 (DGFF gain of light balanced units) handles, close ripple, synthetic at last one road light signal output through multistage light intersection wavelength division multiplexer Interleaver5.1B, 5.2B, 5.3B again.
Wherein light intersects wavelength division multiplexer (Interleaver) in the present embodiment, can adopt full optical fiber mach-Ceng De (Mach-Zehnder) interferometer type, the polarized light interference type that utilizes the birefringece crystal wave plate, Michelson G-T interferometer type, utilize Fabry uncle sieve (F-P) chamber type of multiple-beam interference principle.
Wherein the DGFF gain of light equilibrium treatment unit among this embodiment can adopt technology such as filter that acousto-optic tunable filter, liquid crystal tunable filter, Mach-Zehnder (Mach-Zehnder) Waveguide interference instrument form, Fiber Bragg Grating FBG (FBG) filter, magneto-optic tunable optic filter.
Claims (8)
1. a hybrid dynamic gain of light equalization methods that is used for wdm system comprises partial wave, closes and involve dynamic gain of light equilibrium, it is characterized in that at first light signal being carried out partial wave by wave splitter device, is divided into M group ripple, and every group contains N
iIndividual wavelength uses dynamic gain of light flat filter DGFF to this N again
iWavelength carries out equilibrium treatment, after the processing this M is organized N
iIndividual wavelength signals is coupled in the optical fiber through composite wave appts.
2. hybrid dynamic gain of light equalization methods according to claim 1 is characterized in that every group contains 4-20 wavelength light signal.
3. hybrid dynamic gain of light equalization methods according to claim 1 and 2 is characterized in that every group of contained number of wavelengths can equate or do not wait.
4. hybrid dynamic gain of light equalization methods according to claim 1 and 2 is characterized in that partial wave and closes channel-splitting filter and the wave multiplexer of ripple employing based on dielectric film filter TFF structure.
5. hybrid dynamic gain of light equalization methods according to claim 1 and 2 is characterized in that partial wave and closes the ripple employing adds the circulator structure based on optical fiber bragg grating FBG partial wave, wave multiplexer.
6. hybrid dynamic gain of light equalization methods according to claim 1 and 2, it is characterized in that partial wave with close ripple adopt based on the partial wave of array fiber waveguide AWG structure with close the ripple mode.
7. hybrid dynamic gain of light equalization methods according to claim 1 and 2 is characterized in that partial wave and closes ripple and intersect wavelength division multiplexer Interleaver by light and form channel-splitting filter and wave multiplexer.
8. hybrid dynamic gain of light equalization methods according to claim 7 is characterized in that dynamic gain of light flat filter is made up of the Mach-Zehnder Waveguide interference instrument filter based on hot optical tech.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141346B (en) * | 2007-05-23 | 2010-06-02 | 中兴通讯股份有限公司 | Wavelength division multiplexing passive optical network device |
| CN103885177A (en) * | 2012-12-21 | 2014-06-25 | 微机电科技香港有限公司 | Optical fiber amplifier dynamic gain slope equalizer and manufacturing technology thereof |
| CN106768468A (en) * | 2016-11-14 | 2017-05-31 | 电子科技大学 | A kind of wavelength-division multiplex quasi-distributed optical fiber delay temperature sensor |
| CN113671624A (en) * | 2020-05-13 | 2021-11-19 | 华为技术有限公司 | Optical switching device, redirection method, reconfigurable optical add-drop multiplexer and system |
| CN115955292A (en) * | 2022-12-02 | 2023-04-11 | 江西科技师范大学 | Method for automatically optimizing optical signal-to-noise ratio and spectral flatness of ultra-wideband communication system |
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| US5519796A (en) * | 1995-03-06 | 1996-05-21 | International Business Machines Corporation | Gain equalization using monolithic planar waveguide grating multiplexer and demultiplexer |
| US6445493B2 (en) * | 1999-01-29 | 2002-09-03 | Corning Incorporated | Balanced gain flattening filters |
| JP2002176216A (en) * | 2000-12-07 | 2002-06-21 | Fujikura Ltd | Gain equalizer for polarized plane retaining optical amplifier |
| CN1324829C (en) * | 2001-08-03 | 2007-07-04 | 华为技术有限公司 | Method for implementing power equalization of dense wavelength divison multiplex system |
| US6788844B2 (en) * | 2001-09-10 | 2004-09-07 | Tropic Networks Inc. | All-optical dynamic gain equalizer |
| CN2538103Y (en) * | 2002-03-29 | 2003-02-26 | 武汉光迅科技有限责任公司 | Chromatic dispersion raster structure light power dynamic gain equalier |
| CN1195244C (en) * | 2002-08-15 | 2005-03-30 | 上海交通大学 | Multi-band rare-earth doped optical fibre amplifier |
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- 2003-10-23 CN CNB2003101112612A patent/CN1295900C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141346B (en) * | 2007-05-23 | 2010-06-02 | 中兴通讯股份有限公司 | Wavelength division multiplexing passive optical network device |
| CN103885177A (en) * | 2012-12-21 | 2014-06-25 | 微机电科技香港有限公司 | Optical fiber amplifier dynamic gain slope equalizer and manufacturing technology thereof |
| CN103885177B (en) * | 2012-12-21 | 2017-09-12 | 上海矽睿科技有限公司 | Fiber amplifier dynamic gain slope equalizer and its preparation technology |
| CN106768468A (en) * | 2016-11-14 | 2017-05-31 | 电子科技大学 | A kind of wavelength-division multiplex quasi-distributed optical fiber delay temperature sensor |
| CN113671624A (en) * | 2020-05-13 | 2021-11-19 | 华为技术有限公司 | Optical switching device, redirection method, reconfigurable optical add-drop multiplexer and system |
| CN113671624B (en) * | 2020-05-13 | 2022-11-11 | 华为技术有限公司 | Optical switching device, redirection method, reconfigurable optical add-drop multiplexer and system |
| CN115955292A (en) * | 2022-12-02 | 2023-04-11 | 江西科技师范大学 | Method for automatically optimizing optical signal-to-noise ratio and spectral flatness of ultra-wideband communication system |
| CN115955292B (en) * | 2022-12-02 | 2024-02-02 | 江西科技师范大学 | Method for realizing automatic optimization of optical signal-to-noise ratio and spectral flatness of ultra-wideband communication system |
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| CN1295900C (en) | 2007-01-17 |
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