CN1206269A - MxO multiplex demultiplex component - Google Patents
MxO multiplex demultiplex component Download PDFInfo
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- CN1206269A CN1206269A CN 95121420 CN95121420A CN1206269A CN 1206269 A CN1206269 A CN 1206269A CN 95121420 CN95121420 CN 95121420 CN 95121420 A CN95121420 A CN 95121420A CN 1206269 A CN1206269 A CN 1206269A
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Abstract
An MxO multiplex/demultiplex device is disclosed. An MxN coupler is connected to an NxO coupler by phase shifting means. The phase shifting means provide N paths between the couplers, each path having an optical path length different from every other optical path length. The coupling region of the MxN coupler must provide for substantially uniform division of light power among the coupler branches when M are the launch ports. Similarly, the coupling region of the NxO coupler must provide for substantially uniform division of light power among the coupler branches when O are the launch ports. A preferred embodiment includes two fused waveguide fiber couplers with dissimilar waveguide fibers used as the phase shifting means.
Description
The present invention relates to a kind of M * N that is applicable to the single mode communication system of using the Wave division multiplexing signal multiplexed/the demultiplexing device.
In sequence number is S.N.08/052, has described the principle of Mach-Zehn-der filter in 523 the patent application.In this application, can realize filtering to wavelength by the optical coupling that contains a plurality of wavelength being advanced N bar light path.Basically equally distribute the power between the N bar light path.Length that every light path is had nothing in common with each other or the light that transmits a setted wavelength with different speed.In other words, every light path has different optical path lengths to given optical wavelength.
Advance single light path from the optical coupling that every light path is come, long mutually and destructive interference wherein take place through phase shift.The chosen in advance optical path length is so that specific wavelength of light generation constructive interference and make other optical wavelength generation destructive interference.So predetermined optical wavelength filters out from light signal.Note when light signal is coupled into single light path, just interfering.That is, form coupling, the i.e. position of single output light path in the locus.Therefore filtering is decided by the relative space position of light frequency and filter element.
The principle of phase shift also can be used in wavelength division multiplexing and the demultiplexing by selecting specific optical path length.Yet chosen in advance forms the optical path length of suitable phase shift than difficult.In multiplexed and demultiplexing, because transmit information, so must select to form a plurality of wavelength of constructive interference by the signal of each a plurality of wavelength.
Be in 5,234,672 the United States Patent (USP), to use by one group and represent two star-type couplers of the optical waveguide connection of grating to realize multiplexed and demultiplexing in the patent No. of Dragone." in fact the grating between two star-type couplers is made of the fiber waveguide of the different bending of a row length." the different generations of (I hurdle, II .42-44) optical path length by the light of grating can cause multiplexed and interference demultiplexing.The problem of running in making such device is all with the design of star-type coupler with make relevant.In addition, raster paths must limit the phase error that produces owing to contiguous mutually light path coupling.And, be very difficult and accurate work as the output of star-type coupler or the slab guide the input and the optical coupling between the optical fiber.
So need a kind of coupled apparatus that in light path, limits the cross-couplings phase error.
In addition, effectively multiplexer and demodulation multiplexer must satisfy several standards, as:
-low decay;
-effective Signal Separation;
-environmental stability;
-mechanical stability; And,
-with the compatibility of fibre system.
Because multiplexer/demodulation multiplexer comprises at least one coupler, so system compatibility comprises the coupling of coupler and optical fiber.So multiplexer/demodulation multiplexer device and optical fiber telecommunications system with the coupler that comprises optical fiber are more compatible and more perfect.
Multiplexed is the most economical method that increases the capacity that fiber optic network is installed.Needn't disturb and increase optical cable transmission system and can improve communication network.Because need to increase the capacity of telecommunication, so multiplex system has more attraction.Therefore strengthened to low decay, reliably reaching the searching of the multiplexed reconciliation multiplexing device of more economical and easy manufacturing.
The term optical path length usually refers to the coverage that light is propagated in the waveguide.With effective refractive index n
EffFor the optical path length of one section waveguide of feature by n
Eff* d provides, and wherein d is the length of the waveguide segment that records with usual method.The phase velocity of the light by waveguide segment is an optical path length divided by transmission time of the light of waveguide segment usually.
The effective refractive index n of general waveguide
EffThe propagation constant that is decided by optical wavelength and waveguide.So optical path length is generally inequality by following factor:
-to the light of different wave length;
The waveguide that-counter stress form is different;
-to mixing or the different waveguide of doping;
-to the waveguide different as physical dimensions such as core diameters.
Term percentage refringence or simple refringence are meant fiber waveguide, are defined as here:
δ=100 * { (n
1 2-n
2 2)/2n
1 2, n wherein
1Be the peak value refractive index of core region and n
2It is the refractive index of covering.
The present invention has satisfied the needs that can easily insert the multiplexed and demultiplexing device of better way in the single mode fiber system to a kind of.
First aspect of the present invention is a kind of single mode device that is used for Wave division multiplexing and demultiplexing, it comprises a M * N evanescent wave coupler, a N * O evanescent wave coupler, and be used for N output of a coupler and N the device that input links to each other of other coupler.Each coupler must provide the input optical power of uniform distribution basically in a plurality of outputs.That is, the luminous power brought in of each M of M * N coupler input must be divided into the N equal portions basically and is used for distributing to N output.When N * O was used as input coupler, the luminous power of bringing in from each O input must be divided into N part basically.
When comparing, must distinguish input and output side as the device of the present invention of multiplexer with the identity unit that is used as demodulation multiplexer.As used herein, when the light that comprises at least two signal wavelengths was transmitted into port of the first attenuation ripple coupler, demultiplexing had taken place.When at least two signal wavelengths are transmitted into the input that separates of second coupler, take place multiplexed.In addition, carry out multiplexed and demultiplexing for using device of the present invention, wavelength symmetrically must transmit.That is, the signal of specific wavelength will incident and outgoing from the same port of given coupler always.Multiplexed and correlation demultiplexing will become clearly in following example.
Jockey is meant each N that all produces phase shift transmission line, and this phase shift is different from the phase shift that produces in other any light path in optical transmission.That is, the optical path length of each transmission channel is different from the optical path length of other any transmission channel.
Coupler can comprise that lens and mirror element or it can be good optical fibre device of welding or the plane waveguiding device that is coupled as the basis with the attenuation ripple.
Multiplexed preferred embodiment of the present invention comprises that at least one is the good fiber coupler of describing in 4,983,195 the United States Patent (USP) of welding as the patent No..A coupler has M root input optical fibre and N root output optical fibre.Other coupler has input of N root and O root output optical fibre.Transmission channel between two couplers is an optical fiber, and every optical fiber has the optical path length that is different from other any optical fiber in the transmission channel.
In this embodiment of the present invention, between coupler, contain the optical fiber of jockey, can have different refringences so that every optical fiber is produced identical optical path length.Another kind method is that the core diameter that has the optical fiber of equal length by change also can make optical path length become identical.When producing optical path length variation by the geometric parameters such as core diameter that change refringence or optical fiber, any one section in the optical fiber that couples together along whole piece or several sections optical fiber all exists difference.
The length of the optical fiber of equal length also can change optical path length by changing under normal conditions.
Can adopt the method for several change optical path lengths.They comprise:
-make along whole piece or the fiber lengths that couples together of part with the light submethod to produce variations in refractive index;
-make along whole piece or the generation of the fiber lengths that couples together partly variations in refractive index with thermology method;
-interact along the fiber lengths that the links up generation variations in refractive index of whole or part by electric light; And,
-produce variations in refractive index with the method for stress along whole or the fiber lengths that couples together partly, wherein stress can be caused by calorifics, machinery or similar approach.
Can predict by being included in device that duration of work is used to regulate the phase shift that is risen by one or more phase shifted light pass and can realize producing the better Signal Separation or the better special multiplexed/demultiplexing device of signal to noise ratio.The device of this adjusting phase shift comprises that above-mentioned change connects any device of the optical path length of waveguide.
When the demodulation multiplexer, wavelength optical signals is distributed at least one in M the input of M * N coupler.Input optical power equally distributes in N output basically.Be used for that N output with M * N coupler couples together with N input of N * O coupler and effect that each has a jockey of different optical path lengths is the light that the specific wavelength that is coupled into N * specific output of O coupler is provided for constructive interference.Because the optical path length of jockey is general relevant with wavelength, so when the signal of wavelength multiplexing was coupled to the preliminary election delivery outlet, its each wavelength can produce constructive interference.In present technique, be appreciated that to one-period family wavelength constructive interference will take place.Generally, first order constructive interference is multiplexer/interested problem of demodulation multiplexer that signal and noise level are separated basically.
When carrying out the reverse operation of demultiplexing work, this device plays multiplexer.But for example in O the port of an incident N * O coupler that has nothing in common with each other in the individual wavelength of having any different of O.Wavelength in specific port incident must be corresponding to the wavelength in that port outgoing in de-multiplex operation.
Be appreciated that by the intrinsic spatial relationship of interference and cause space correlation between multiplexed and the demultiplexing effect.For example, consider a demultiplexing device, wherein from the first output port outgoing wavelength l of N * O coupler
1, from the second output port outgoing wavelength l
2Or the like, and at last output port outgoing l
0For M output port from M * N coupler obtains multiplex signal, l
1Must incide first port of N * O coupler, l
2Incide second port or the like up to l
0Incide in last port, light signal needn't incide in each port.But must keep each M * N and the particular port of N * O coupler and the correspondence between the specific wavelength signal.
Fig. 1 is the schematic diagram of M * N multiplexer/demodulation multiplexer.
Fig. 2 is the schematic diagram with 4 * 4 multiplexers/demodulation multiplexer of wavelength multiplexed on two coupler branches.
Fig. 3 is the schematic diagram with 4 * 4 multiplexers/demodulation multiplexer of wavelength multiplexed on a coupler branches.
Fig. 4 is used to calculate the power of 4 * 4 multiplexers/demodulation multiplexer and the relation curve of wavelength.
Fig. 5 a is the end view drawing of 1 * 4 welding optic fibre coupler before the welding, and the symmetric arrays of optical fiber in the coupled zone is shown.
Fig. 5 b is the end view drawing of 4 * 4 welding optic fibre couplers before the welding, and the symmetric arrays of optical fiber in the coupled zone is shown.
Fig. 5 c is the end view drawing of 2 * 4 welding optic fibre couplers before the welding, and the symmetric arrays of optical fiber in the coupled zone is shown.
Be that 5d is the side schematic view of 2 * 4 welding optic fibre couplers, 2 straight-through optical fiber and 2 butts be shown connect optical fiber.
Fig. 5 e is the ring-type welding optic fibre array of N root optical fiber before the welding.
Fig. 5 f is the side schematic view of ring-type welding optic fibre array, and some straight-through and some terminated optical fibers are shown.
Principal character of the present invention shown in Fig. 1 schematic diagram.One or more optical wavelength can incide M input 2 of coupler 8.Coupler is divided into basic N part that equates to the incident power from each input 2, is used to be output end 4 and transmits.Output 4 is all linked the phase-shifting element 6 that is used for light is input into N input of coupler 10.Each element 6 is offset the phase place of the light that transmits with the amount that is different from other element 6.In coupler 10, a certain wavelengths in each input light in phase is coupled to output 10.So select the phase-shift phase of each element 6 so that in an output 12 of choosing only to a wavelength generation constructive interference.The light of other wavelength produces destructive interference in an output of choosing.So the single wavelength of 12 transmission of each output from a plurality of wavelength that incide input 2, thereby make the signal demultiplexing of incident.
When different each in N the wavelength incided O port one 2 of coupler 10 respectively, this device just played the multiplexer effect.So, penetrate multiplexed signal from port one 2.
In Fig. 2, schematically represent 2 * 4 a multiplexers/demodulation multiplexer.Wavelength is l
1And l
2Signal incide in the port one 4 of coupler 16 first.Wavelength is l
3And l
4Signal incide in the port one 4 of coupler 16 second.Signal is propagated along phase-shifting element 18.Each all is loaded with 4 wavelength in the element.The incident power of each wavelength five equilibrium basically in element 18.Signal reconfigures and sends to port 22 in coupler 20.Each wavelength l
1, l
2, l
3And l
4Only constructive interference in one of them of port 22.So each only transmits a wavelength in the port 22.
For the device shown in Fig. 2 is used as multiplexer, having wavelength is l
1, l
2, l
3And l
4Signal in different each mouthfuls 22 that incide coupler 20.When wavelength is l
1And l
2Signal phase shift and by behind the coupler 16 in element 18, will constructive interference take place in a branch of coupler and pass in the port one 4 one.In an identical manner, wavelength is l
3And l
4Signal will pass on another of port one 4.Note multiplexed and the invertibity demultiplexing effect.For example, l
1Must be from port one 4 identical one with port 22 in an identical outgoing or incident.Same invertibity is applicable to wavelength l
2, l
3And l
4
The effect of multiplexed/demultiplexing device be decided by among Fig. 16 and Fig. 2 in each phase-shifting element of 18 select suitable optical path length.A series of equations of describing suitable optical path length are non-linearly and typically with the solution of making up the number or amount, iterative technique, preferably separate by computer.
The equation that is used for 2 * 2 multiplexing/Signal Separation device provides at " fiber optic network " that Paul.E.Green showed (Fiber OpticNetworks) book of Pren-tice Hall publication in 1993.Use Green's symbol and matrix form, write out be used for 1 * N multiplexed/equation of demultiplexing device.Device comprise 1 * N coupler, N * N coupler and be connected in N phase-shifting element between two couplers.
The phase shift that can use matrix description to cause by N phase-shifting element.So matrix size be N * N and because phase-shifting element in do not have luminous power coupling it have only diagonal values.Phase shift matrix [P] has element,
[P]
Rs=exp (i δ (a
r) z/l), work as r=s, and
[P]
Rs=0, as r ≠ s, r=1 here, 2 ... N.Character δ (a
r) be that relevant wavelength is the incremental angular of the phase shift introduced of r phase-shifting element of the signal of l.Z is the length along waveguide.Each light that incides the different wave length in the coupler of 1 * N all there is [P] matrix.[P] matrix reaches the phase shift field of the coupler of N * N with generation with the vector work of N * 1 of the electromagnetic field of having described the coupler that incides 1 * N.
Because light is coupled in N branch during by N * N coupler, so describe the field amplitude propagated in N * N coupler and the collision matrix [S] of phase place is not the diagonal angle generally.Find the element of [S] by following criterion:
-for each optical wavelength, light is at N output five equilibrium basically;
-optical propagation direction is not an essence, so [S]
Rs=[S]
SrAnd,
-energy is kept in the coupler, thereby [S]
*[S]=[l], [l] is unit matrix here, [S]
*Be that conjugate matrices and [S] are through normalization.
The vector that matrix [S] incides electromagnetic field N * 1 of N * N coupler to representative works.Wavelength to each incident all can have [S] matrix.Yet, in some situation [S] can with Wavelength-independent (example) as follows.
If [E] is the field of inciding 1 * N coupler, the field [X] of N * N coupler equipped at outlet port is to be provided by following matrix equation formula so,
[X]=[S
2][P][S
1][E]。In this equation, [S
1] provide the separating degree of [E] in N the delivery outlet.[P] provides the phase-shift phase of N phase shift branch midfield.[S
2] provide the separating degree of the final output midfield of N.
This formula can be used for describing M * O multiplexer/demodulation multiplexer.Such device comprises the coupler of coupler, a N phase-shifting element and the N * O of a M * N.In the welding optic fibre coupled apparatus, the respective counts of input and output optical fiber can change by the particular fiber that terminates in the both sides, coupled zone.Example-one 4 * 4 many coverings of single mode multiplexer/demodulation multiplexers.
Signal with reference to 3, one four wavelength multiplexings of figure incides in the input optical fibre 24.It is l that Fig. 3 is illustrated in the wavelength that is loaded with on the single input optical fibre of 4 * 4 couplers of many coverings coupler preferably
1, l
2, l
3And l
4The field.
Use S
Rs=S
Sr, [S]
*[S]=[l], and the criterion of five equilibrium only in 4 * 4 couplers, four output branch road medium wavelength l that can determine at coupler
i, the field of (i=1,2,3,4) is the collision matrix how to distribute.
Make [S]
Rr=C exp (ia), to r=1,2,3,4, and
[S]
Rs=C exp (ib), to r ≠ s, and r, s=1,2,3,4, a and b are phase angles and C is a real number here.Notice that this matrix satisfies [S]
Rs=[S]
SrIf Ei has the field that wavelength is li, four resolutes that are used for describing the input coupler branch midfield shown in Fig. 3 so are that the first row intermediate value is to be zero column vector in the column vector of Ei and the excess-three row thereof.Phase angle a is chosen as the phase angle of reference and is set at zero.
Try to achieve constant formula [S]
*The matrix product of pointing out among [S]=[l] is also descended equation to corresponding component equate:
4C
2=1, and
C
2exp(ib)＋C
2exp(-ib)=-2C
2。
First formula gets C=(0.25)
1/2Second formula gets cos (b)=-1, thereby, b=180 °.Therefore the matrix [S] that satisfies certain criteria is to r, s=1,2,3,4 important S
Rr=(0.25)
1/2, and S
Rs=-(0.25)
1/2Note [S] and Wavelength-independent.
Select the equal in length of the 2b of phase shift branch among Fig. 3 and have separately refringence △
j, j=1,2,3,4.So to the phase shift matrix of a setted wavelength l with important [P]
Rr=exp2 π i/l (△
j-△
1) z, j=1,2,3,4, and [P] to r ≠ s, arranged
Rs=0.
To the input field [E] in the branch of branch 24, the field [X] at output 28 places is,
[X]=[S][P][S][E]。Power output is proportional to [X]
2Absolute value.The examination number that uses this matrix equation formula and know in art of mathematics substitutes solution can obtain △
jThat group refringence of power curve is among generation Fig. 4: △
1=0.003000; △
2=0.010000; △
3=0.024000; And, △
4=0.035025.
Select the refractive index △ of phase-shifting element to produce a device, four signal wavelengths that wherein incide the simple optical fiber of one 4 * 4 coupler simultaneously will be divided into four wavelength, and they will appear at each output of four outputs of the 24 * 4 coupler.According to above-mentioned invertibity, when four signals incided mutually same port 28, this device was with multiplexed these four signals.
Comprise that to having solution more than [S] matrix of the multiplexed/demultiplexing device of four outputs more complicated examination counts the iterative solution method process.Matrix [S] is general relevant with wavelength.Different coupler geometricss causes different [S] matrixes.
The preferred embodiment of multiplexing/Signal Separation device comprises above-mentioned outer cladding coupler.Be coupled to the symmetric arrays of second group of optical fiber and first group of optical fiber on the second waveguide group zone from the first waveguide group at power, realize the equal distribution of luminous power required for the present invention.The geometric figure of two waveguide group symmetries has guaranteed the symmetrical coupled of power basically.
The relevant symmetric arrays of four of simple optical fiber optical fiber in the outer cladding coupler more than 1 * 4 has been shown among Fig. 5 a.The main body of surrounding layer does not illustrate.Though the most handy surrounding layer welding optic fibre coupler also can use the fused coupler that does not have surrounding layer.
Illustrated among Fig. 5 b in the coupled zone of 4 * 4 couplers do tapered before the symmetric arrays of four optical fiber.
The diamond array of Fig. 5 c is applicable to 2 * 4 welding optic fibre coupler.Optical fiber 30 by coupler the coupled zone or the welding area after terminating.The end view of 2 * 4 diamond structures shown in Fig. 5 d.Optical fiber 32 is terminating optical fiber and optical fiber 35 is called straight-through optical fiber.
To the M * N welding optic fibre coupler of higher fiber count, attempt with the structures such as ring-type as shown in Fig. 5 e.For example, can some M of terminating input optical fibre, to offer N output optical fibre, M＞N here.In Fig. 5 e, the 34th, straight-through optical fiber and 36 be terminating optical fiber.
It in people's patent No.s such as Miller the example that has been shown specifically and has discussed many coverings of 1 * N coupler of symmetry in 5,017,206 the United States Patent (USP).
Consider to offer plane 1 * N device of the equal attenuation coupling of signal in N the branch.Single slab guide light path can be coupled on N the light path that is positioned in turn on the single light path.In other words, the device of consideration is to have N the slab guide with its short circuit head that stretches out.
Claims (10)
1. device that is used for single-mode optics communication signal Wave division multiplexing and demultiplexing is characterized in that comprising:
The first attenuation ripple coupled apparatus with M input port and N output port is wherein from each the power five equilibrium in N output port basically in the described M input port;
The second attenuation ripple coupled apparatus with N input port and O output port, each in the described N input port with the power of each specific wavelength be coupled into a preliminary election port of a described O output port respectively; And
Be used for each described N delivery outlet of described first coupler is connected to respectively the method for corresponding each described N input port of described second coupler, to form N bar light path between the described the one the second attenuation ripple couplers, wherein each described N optical path length is identical.
2. Wave division multiplexing as claimed in claim 1 is conciliate multiplexing device, it is characterized in that the fiber coupler that at least one described attenuation coupler is welding.
3. Wave division multiplexing as claimed in claim 2 is conciliate multiplexing device, it is characterized in that a described N optical path length comprises planar optical waveguide.
4. Wave division multiplexing as claimed in claim 1 is conciliate multiplexing device, it is characterized in that at least one described attenuation coupler is the plane coupler.
5. Wave division multiplexing as claimed in claim 1 is conciliate multiplexing device, it is characterized in that a described N optical path length comprises optical fiber, and every described optical fiber has refringence, length and core diameter.
6. Wave division multiplexing as claimed in claim 5 is conciliate multiplexing device, it is characterized in that by change the described refringence of every described optical fiber respectively along the length of at least a portion of every described optical fiber, or by change the core diameter of described optical fiber respectively along the length of at least a portion of described optical fiber, or, can change described optical path length by changing the length of described optical fiber respectively.
7. Wave division multiplexing as claimed in claim 1 is conciliate multiplexing device, it is characterized in that it also comprises the adjusting device of at least one the described optical path length in the preselected range that is used for regulating whole optical path length.
8. a single mode Wave division multiplexing is conciliate multiplexing device, it is characterized in that comprising:
Has at least one input optical fibre, article at least three, the first welding optic fibre coupler of an output optical fibre and a taper coupled zone, thus be coupled to every described output optical fibre at the power that described at least one input optical fibre in coupled zone and described at least three output optical fibres are welded together the equivalent basically of coming from described input optical fibre;
Have some input and output optical fiber, and the second welding optic fibre coupler of a taper coupled zone, the input optical fibre number of the described second welding optic fibre coupler equals the output optical fibre number of the described first welding optic fibre coupler at least, at the input and output fused fiber splice of described second coupler in taper coupled zone together, thus the signal power of specific wavelength is coupled respectively in the described output optical fibre of a preliminary election in each described input optical fibre; And
With the different connection optical fiber that the output optical fibre number of the described first welding optic fibre coupler equates, be connected between the described input of the described output of the described first welding optic fibre coupler and the described second welding optic fibre coupler;
Wherein each described connection optical fiber that has nothing in common with each other produces phase shift in the light signal of propagating, and this phase shift is different from the phase shift that other connection optical fiber that has nothing in common with each other produces.
9. Wave division multiplexing as claimed in claim 8 is conciliate multiplexing device, it is characterized in that each described connection optical fiber that has nothing in common with each other has the refringence that is different from other connection optical fiber that has nothing in common with each other along at least a portion length of described connection optical fiber.
10. a single mode Wave division multiplexing is conciliate multiplexing device, it is characterized in that comprising:
First optical coupler with M input port and N output port, described coupler so constitute equally to distribute the input power of each described M input port in a described N output port;
The power that second optical coupler with N input port and O output port, described coupler so constitute with the specific wavelength that each described N input port is come is coupled in the particular port of a described O output port; And
Each described N output port of described first coupler is linked the phase changer on the corresponding port of the described input port of described second coupler;
Wherein at each described output port of described second coupler, to a preselected wavelength generation constructive interference, and the described preselected wavelength of each described equipped at outlet port of described second coupler is different from other any described preselected wavelength, and the former can randomly comprise the device that is used for incrementally changing in the scope of whole preliminary election the phase shift that is produced by at least one described phase changer again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95121420 CN1206269A (en) | 1994-12-12 | 1995-12-12 | MxO multiplex demultiplex component |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/353,822 | 1994-12-12 | ||
| CN 95121420 CN1206269A (en) | 1994-12-12 | 1995-12-12 | MxO multiplex demultiplex component |
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| Publication Number | Publication Date |
|---|---|
| CN1206269A true CN1206269A (en) | 1999-01-27 |
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ID=5082435
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95121420 Pending CN1206269A (en) | 1994-12-12 | 1995-12-12 | MxO multiplex demultiplex component |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1984502B (en) * | 2005-11-30 | 2010-12-22 | 阿尔卡特公司 | Optical switching device for a transparent node of high switching degree adapted to spectral equalization |
-
1995
- 1995-12-12 CN CN 95121420 patent/CN1206269A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1984502B (en) * | 2005-11-30 | 2010-12-22 | 阿尔卡特公司 | Optical switching device for a transparent node of high switching degree adapted to spectral equalization |
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