CN1205817A - Optical spectral multiplexer for inserting and extracting - Google Patents
Optical spectral multiplexer for inserting and extracting Download PDFInfo
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- CN1205817A CN1205817A CN 96199115 CN96199115A CN1205817A CN 1205817 A CN1205817 A CN 1205817A CN 96199115 CN96199115 CN 96199115 CN 96199115 A CN96199115 A CN 96199115A CN 1205817 A CN1205817 A CN 1205817A
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Abstract
For extracting a multiplex (MT) from an incoming multiplex (ME) and for inserting a multiplex (MI) to be inserted in an outgoing ultiplex (MS), the multiplexer comprises: a distributor (D1) for distributing on N outputs the incoming multiplex (ME); a combiner-distributor for distributing on N circuits the multiplex to be inserted (MI); a first set of N tuneable filters (F1T,...,FNF) for selecting the signal carriers which are going to be used for modulating the carriers of the outgoing multiplex (MS); a second set of tuneable N filters (F1E,...,FNE) for selecting the carriers which will constitute the extracted multiplex (MT); N wavelength converting devices (CL1,...,CLN) capable of supplying N carriers of the outgoing multiplex (MS); N optical switches (SW1,...,SWN) with two inputs and two outputs for selectively connecting each distributor output (D1,D2) to the input of a filter of the first set and/or transmitting to the input of a filter of the second set;
Description
The present invention relates to a kind of optical spectral multiplexer for inserting and extracting, be used for: receive an input multiplexing that contains a plurality of Wave division multiplexing light carriers, extract the multiplexing that to extract out out, and the multiplexing that will insert is inserted in the output multiplexing.The multiplexing that each will insert and the multiplexing of extraction comprise the light carrier of a plurality of parallel conveys respectively, promptly as a wavelength division multiplex transmission.But each light carrier modulated signals modulation, modulation signal can be made of a plurality of time division multiplex channels.This multiplexer can be used to realize the optical transport network of synchronous digital hierarchy especially.
Alcatel CIT by name, the French Patent (FRP) of application number No.94 06984 has been described this multiplexer, and it comprises:
The first optics broadcasting equipment, it receives the input multiplexing, and it is sent from N outlet, and N is the maximum number of input multiplexing and output multiplexing medium wave long number here;
First group of N tunable optic filter, N outlet with first broadcasting equipment is coupled respectively, so that choose E the carrier wave that will extract out and T the carrier wave that will transmit in the input multiplexing, E and T are variable here, but are not more than N;
The second optics broadcasting equipment, it receives the multiplexing that will insert, and it is sent from N outlet;
Second group of N tunable optic filter, it chooses I the carrier wave that will insert from form the multiplex carrier wave that will insert, and I is variable here, but is not more than N;
An optical combiner, it carries out Wave division multiplexing being no more than N carrier wave, thereby forms the multiplexing of output;
N wavelength shifter, it at first provides T new carrier wave to combiner, T the new modulated respectively T of carrier wave signal that is transmitted carrier wave modulated, next provides I new light carrier, the signal of I the new modulated respectively I of light carrier the carrier wave that will insert is modulated, I+T is less than or equal to N, and this N new carrier wave has the wavelength that is separated from each other;
The optical switch of N two inputs, two outputs, each switch has:
First input, it is exported accordingly with first group of filter and is connected;
Second input, it is exported accordingly with second group of filter and is connected;
First output, it is connected with the input of a corresponding wavelength shifter; And
Second output, it provides the carrier wave of an extraction, to constitute the multiplexing of extracting out; And
Control device is used for the control of N optical switch and 2N tunable optic filter.
This known device can be chosen multiplex carrier wavelength of input and the multiplex wavelength of output independently; Can also choose the multiplex wavelength and the multiplex wavelength of output that will insert independently.If each optical switch can both have been delivered to a carrier wave multiplexing of extraction, also deliver to the multiplexing of output, just this device can be identical signal broadcasting to a plurality of destinations so.
Alcatel NV by name, the European patent of application number No.0 592 330 has been described a kind of optical switch matrix, its advantage is strictly clog-free, and it can be made the insertion that can insert in the bi-directional optical (promptly to link of each transmission direction) and extract optical spectral multiplexer out.To each transmission direction, this optical switch matrix comprises:
By a broadcasting equipment and the first order that combiner one broadcasting equipment is formed, broadcasting equipment receives the input multiplexing that is formed by stacking and is loaded with modulation signal by the carrier wave of four different wave lengths, described broadcasting equipment is sent described multiplexing from four outputs of broadcasting equipment, combiner one diffuser receives and is loaded with modulation signal and mutually different four carrier waves of wavelength, four mutually different wavelength are chosen as with to import multiplex four wavelength identical, thereby these four carrier waves of combiner-diffuser Wave division multiplexing constitute a multiplexing will inserting, then the multiplexing that will insert are broadcast to four outputs of combiner-diffuser;
The second level of forming by four optical switches, wherein two optical switches are exclusively used in the multiplexing of extraction, each switch has two inputs, link to each other with output of broadcasting equipment and an output of combiner-broadcasting equipment respectively, two other optical switch is exclusively used in the output multiplexing, each switch has two inputs, links to each other with output of broadcasting equipment and an output of combiner-broadcasting equipment respectively;
By first group and second group of each four third level that tunable optic filter is formed, first group of multiplexing that is exclusively used in extraction, its four inputs are connected respectively to four outputs of two switches of the multiplexing special use of extraction, its four outputs then provide four carrier waves respectively, enable to constitute the multiplexing of an extraction; Second group of multiplexing that is exclusively used in output, its four inputs are connected respectively to four outputs of two switches of output multiplexing special use, and its four outputs then provide four carrier waves respectively;
By one group of four fourth stage that wavelength shifter is formed, its four inputs link to each other with four outputs of second group of filter respectively, when four carrier waves transmit by second group of filter, four new carrier waves of four wavelength shifter emissions by identical modulation signal modulation, thus can set up an output multiplexing; And
Control the control device of four optical switches and eight tunable optic filters.
The purpose of this invention is to provide a kind of insertion and extract multiplexer out, it is strictly choke free, and can prevent switch, and filter, or the damage of wavelength shifter also have simultaneously and be easy to the structure that realizes and control.
Optical spectral multiplexer is extracted in insertion provided by the invention out, it receives multiplexing and the multiplexing that will insert of an input, provide the multiplexing of an output and the multiplexing of an extraction, each all comprises a plurality of light carriers in these multiplexing, the wavelength of each light carrier all differs from one another in any multiplexing, and this multiplexer comprises:
First group of filter, each filter all may be tuned in input multiplexing and the multiplexing that will insert on any possible carrier wavelength, so that select the carrier wave that those are loaded with the signal that will transmit in the output multiplexing at least from described carrier wave;
Second group of filter, each filter all are tunable to any possible carrier wavelength in the multiplexing of importing multiplexing and will inserting, so that select the carrier wave that those are loaded with the signal that will transmit in the multiplexing of extraction at least from described carrier wave; And
Transmitting device, it is not that an input multiplexing is any input that the multiplexing that will insert is sent to first group or second group filter;
The feature of this multiplexer is, its transmitting device comprises a plurality of switches, each switch has at least one first output to be coupled to first group of corresponding filter of filter, has at least one second output to be coupled to second group of corresponding filter of filter simultaneously.
Advantage with multiplexer of this feature is, if same carrier wave is sent to the multiplexing of output multiplexing and extraction simultaneously in the multiplexing that need not maybe will insert the input multiplexing, so just, can adopt easy switch, it only can be connected to an input the single output of switch.In addition, the advantage that it also has is can be with simple mode reserve, disclosing as the following describes.
From the explanation and accompanying drawing of a following embodiment, can more deep more detailed understanding be arranged to the present invention, accompanying drawing has:
Fig. 1 is the block diagram of an embodiment of multiplexer of the present invention; With
Fig. 2 is the block diagram of same embodiment, but has the attachment device that constitutes the reserve passage.
Embodiment illustrated in fig. 1 comprising:
An optics broadcasting equipment D1, it has the input and N the output that receive input multiplexing ME, and input multiplexing ME is formed by stacking by being no more than N the carrier wave that can carry modulation signal, and N corresponding wavelength X arranged
1... λ
N, each all sends the input multiplexing N output;
An optical combiner-broadcasting equipment D2, it has N input and N output, N input can receive respectively and be no more than N different wavelength X "
1..., λ "
NCarrier wave, these wavelength can be hanked and λ
1..., λ
NComplete can carry the also formation multiplexing MI that will insert of modulation signal with, these carrier waves, each all sends multiplexing with described N carrier wave stacking pattern insertion N output;
N optical transmitting set TX
I 1... TX
I N, N the carrier wave of the multiplexing MI that formation will insert can be provided respectively, each reflector can receive the signal of telecommunication of expression data flow, and in order to the light carrier of modulate emission, each reflector has different fixing wavelength, these wavelength all are selected from N wavelength X "
1..., λ "
N
N optical switch SW
1..., SW
N, each switch comprises:
First light input g, corresponding output with broadcasting equipment D1 links to each other;
Second light input h links to each other with combiner-corresponding output of broadcasting equipment D2;
A control is imported, and is connected to the output of control device MC by a link (not shown); And
First light output k and second light output j;
First group of N filter F
T 1..., F
T N, each filter tunable is to importing any one wavelength X in multiplexing and the multiplexing that will insert
1..., λ
N, λ "
1... λ "
N, each filter has: a light input, and with switch SW
1..., SW
NIn the first output k of a corresponding switch link to each other, a control input links to each other with the output of control device MC by the link (not shown), and a light is exported;
Second group of N tunable optic filter F
E 1..., F
E N, each filter tunable is to importing any one wavelength X in multiplexing and the multiplexing that will insert
1..., λ
N, λ "
1..., λ "
N, each filter has: a light input, and with switch SW
1... SW
NIn the second output j of a corresponding switch link to each other, a control input, link to each other with the output of control device MC by the link (not shown), and a light output, one group of N output of these filters can provide N carrier wave to constitute the multiplexing MT of an extraction;
One group of N wavelength shifter CL
1..., CL
N, each converter is made up of for example optical receiver and follow-up optical transmitting set, and each converter has wavelength fixing but that differ from one another, these wavelength are selected from mutually different wavelength X '
1... λ '
N, this N mutually different wavelength can with λ
1... λ
N, or and N "
1..., N "
NTogether complete, the input of each receiver and filter F
T 1..., F
T NIn corresponding one output link to each other;
An optical combiner C1, it has N input and an output, imports and converter CL for N
1..., CL
NIn the output of a corresponding converter link to each other, it is λ ' that output is then sent by wavelength
1..., λ '
NBe formed by stacking one output of carrier wave multiplexing MS; And
One group of N optical receiver RX
E 1..., RX
E N, each all has an input and an output, each input and second group of filter F
E 1..., F
E NIn corresponding one output link to each other, output then provides the signal of telecommunication of the data that representative transmits by carrier wave, this carrier wave is that the receiver input is received.
In this structure, switch SW
1..., SW
NNo matter be not exclusively used in single multiplexing of formation, be multiplexing output or that extract out.Switch SW
1..., SW
NIn each multiplexing MI that can both transmit input multiplexing ME and will insert.Multiplexing ME and MI can be to first group of filter F
T 1..., F
T NTransmit, also can be to second group of filter F
E 1..., F
E NTransmit, perhaps, look the type of used switch, also can transmit to two groups of filters simultaneously.These switches can be alternately or are side by side carried out this two kinds of functions.
If need not same carrier wave is sent to simultaneously the multiplexing MT of output multiplexing MS and extraction, so switch SW
1..., SW
NCan be with the switch that has only binary states, this two states is:
First state, input g links to each other with output k, imports h simultaneously and links to each other with output j; With
Second state, input h links to each other with output k, imports g simultaneously and links to each other with output j.
If must be sent to a single carrier wave simultaneously the multiplexing MT of output multiplexing MS and extraction, each switch all must be able to have four kinds of states so, and promptly above-mentioned two states adds the two kinds of additional states in top and bottom:
The third state, input g links to each other with j with output k simultaneously; With
Four condition, input h link to each other with j with output k simultaneously.
Each wavelength shifter CL
1..., CL
N, role is: reception can be carried modulation signal and wavelength X is arranged
1... λ
NOr λ "
1..., λ "
NCarrier wave, launch one new by described corresponding modulation signal modulation and be selected from λ '
1... λ '
NIn the carrier wave of a fixed wave length.These wavelength shifters can be from wavelength X "
1..., λ "
NAnd wavelength X '
1... λ '
NIn select wavelength X independently
1..., λ
N
Scope of the present invention is not limited to the situation that embodiment enumerates, and promptly imports multiplexing, the output multiplexing, and the multiplexing that insert and the multiplexing of extraction all have identical maximum wavelength number.With N 2 * 2 switches (or device of equivalence on the function), each input multiplexing and the multiplex carrier number of output can not surpass N.But can insert I carrier wave,, also can extract E carrier wave out, as long as the numerical value of E is less than or equal to N as long as the numerical value of I is less than or equal to N.Reflector TX
INumber and the number of combiner-broadcasting equipment D2 input all equal I at least.Receiver RX
ENumber and filter F
ENumber all equal E at least.
This professional skilled person can change multiplexer of the present invention, makes it to be suitable for injecting two-way link (link of each transmission direction).For example, can be with two kinds of 4 * 4 switches that link is shared, as 0 592 330 descriptions of above-named file EP.
In some applications, the combiner and the broadcasting equipment that constitute combiner-broadcasting equipment D2 can be separated from each other, sometimes even each other wide apart.All or some reflector TX
I 1..., TX
I NWith receiver RX
E 1..., RX
E NCan be away from other devices of multiplexer.
Fig. 2 is the block diagram of same embodiment, but has attachment device, as tunable optic filter F
T 1..., F
T NAnd F
E 1F
E NIn when having one to damage, or converter CL
1... CL
NIn when having one to damage, or optical receiver RX
E 1... RX
E NIn when having one to damage, or switch SW
1... SW
NIn when having one to damage, attachment device can be remedied.These attachment devices comprise:
The additional output of broadcasting equipment D1 and the additional output of combiner-broadcasting equipment D2;
With switch SW
1..., SW
NA similar additional optical switch SW
SIt has: first light input end that is connected to the additional output of broadcasting equipment D1, be connected to second light input end of the additional output of combiner-broadcasting equipment D2, be connected to a control input end of the additional output of control device MC through a link (not shown), one first output, and one second output;
An additional filter F
T S, it has an input and extra switch SW
SFirst output connect, control input end one a link (not shown) is connected with the additional output of control device MC, and an output;
An additional wavelength shifter CL
S, it has a light input end and additional filter F
T SOutput connect, also have a light output end that one fixed wave length λ ' is provided
N+1Carrier wave, if converter CL
SFixedly output wavelength is arranged, then wavelength X '
N+1Be different from wavelength X '
1..., λ '
NIf, converter CL
STunable output wavelength is arranged, then wavelength X '
N+1Can select to equal wavelength X '
1..., λ '
NIn one;
An additional input end on the optical combiner C1, it and additional transformation device CL
SOutput connect;
A second additional tunable optic filter F
E S, it has a light input end to be connected to extra switch SW
SSecond output, control input end one a link (not shown) is connected to the additional output of control device MC, and an output, provides the carrier wave of a multiplexing MT part of form extracting out; And
An optical receiver RX
E S, it has an input and the second additional filter F
E SOutput connect, an output provides the signal of telecommunication.
Work as switch SW
1..., SW
NIn one when damaging, by the control signal that is added in originally on the disable switch is added on the extra switch, disable switch on function just by extra switch SW
SReplace.Therefore very easy enforcement control.
As filter F
T 1..., F
T NIn a damage, or converter CL
1... CL
NIn one contain a pair of filter-converter of ineffective part when damaging, on function just by additional filter F
T SWith converter CL
SThe a pair of device of forming replaces, and control signal is added on the switch that is connected with a pair of device that contains ineffective part usually, then is added to extra switch SW now
SOn.Therefore very easy enforcement control.
As filter F
E 1..., F
E NIn a damage, or optical receiver RX
E 1..., RX
E NIn one contain a pair of filter-receiver of ineffective part when damaging, on function just by additional filter F
E SWith additional receiver RX
E SReplace, simultaneously, be added in the control signal on the switch that is connected with a pair of device that contains ineffective part usually, controlling extra switch SW now
STherefore very easy enforcement control.
Can see reflector TX in this embodiment
I 1... TX
I NIn one when damaging, do not provide remedial measure.If requirement can be remedied this class and damage, can increase the attachment device (not shown) again, the attachment device of increase comprises an additional transmitters, its additional input end with combiner-broadcasting equipment D2 is connected, and to provide wavelength to it is λ "
N+1Carrier wave, if additional transmitters is a fixed wave length, wavelength X "
N+1Be different from all wavelengths λ "
1..., λ "
NIf additional transmitters has tunable wavelength, wavelength X then "
N+1Be chosen as and equal wavelength X "
1..., λ "
NIn a wavelength.
Certainly, by changing the output number of broadcasting equipment D1 and combiner-broadcasting equipment D2, change the input number of combiner-diffuser D2 and combiner C1, and change control device MC, a large amount of additional devices (switch, filter can be provided, converter, reflector, receiver).
Should see that each switch all provides equally easily the gateway to lead to the multiplexing MS of output and the multiplexing MT of extraction, this is true to produce two favourable results:
Needn't use four attitude switches, remove the multiplexing of leaveing no choice but implement same carrier wave is transferred to simultaneously output multiplexing and extraction; And
Can remedy the damage of a switch in the switch with a single extra switch.Therefore realized overcoming the protective device of damage simply.
Claims (6)
1. one kind is inserted the extraction optical spectral multiplexer, it receives an input multiplexing (ME) and the multiplexing that will insert (MI), and provide the multiplexing (MT) of output multiplexing (MS) and an extraction, each all comprises a plurality of light carriers in these multiplexing, each carrier wavelength all differs from one another in any one multiplexing, and this multiplexer comprises:
First group of filter (F
T 1... F
T N), each filter all may be tuned at any possible carrier wavelength (λ in the multiplexing of importing multiplexing and will inserting
1..., λ
N, λ "
1... λ "
N) on, so that selecting at least from described carrier wave that those are loaded with will be at the carrier wave of signal of output multiplexing (MS) transmission;
Second group of filter (F
E 1..., F
E N), each filter all is tunable to any possible carrier wavelength (λ in the multiplexing of importing multiplexing and will inserting
1..., λ
N, λ "
1..., λ "
N) on, so that from described carrier wave, select the carrier wave that those are loaded with the signal that will transmit in the multiplexing (MT) of extraction at least; And
Transmitting device (D1, D2, SW
1..., SW
N), it is not that an input multiplexing (ME) is that the multiplexing (MI) that will insert is sent to first group or second group of filter (F
T 1..., F
T NF
E 1... F
E N) any input;
The feature of this multiplexer is that its transmitting device comprises a plurality of switch (SW
1..., SW
N), each switch has at least one first output (k) to be coupled to first group of filter (F
T 1... F
T N) a corresponding filter, have at least one second output (j) to be coupled to second group of filter (F simultaneously
E 1..., F
E N) a corresponding filter.
2. according to the multiplexer of claim 1, it is characterized in that each switch (SW
1..., SW
N) can both (g, any is simultaneously exported (j) with first output (k) and second of same switch and is connected in h) its input.
3. according to the multiplexer of claim 1 or 2, be used for an input multiplexing, an output multiplexing, the multiplexing that will insert, with the multiplexing of an extraction, each multiplexing all comprises and is no more than N carrier wave, and N carrier wavelength all differs from one another in arbitrary given multiplexing, the feature of this multiplexer is that each switch arrays comprises N independent switch (SW
1... SW
N), each independent switch has: (g, h), one first light is exported (k), one second light output (j) and a control input in two light inputs.
4. according to the multiplexer of claim 1, it is characterized in that transmitting device (D1, D2, SW
1..., SW
N) also comprise:
First broadcaster (D1) is broadcast to input multiplexing (ME) N output of described first device; With
Second broadcaster (D2) is broadcast to the multiplexing that will insert (MI) N output of described second device;
At described switch arrays (SW
1... SW
N) in comprise: N input (g) links to each other with the output of first broadcaster (D1) corresponding N, and N input (h) links to each other with the output of second broadcaster (D2) corresponding N, a control input, N first output (k) and N second output (j).
5. according to the multiplexer of claim 4, it is characterized in that it can be remedied damaging, it also comprises:
On first broadcaster (D1), has an additional output at least;
On second broadcaster (D2), has an additional output at least;
At least one extra switch (SW
S), it has two additional input ends, one first additional output and one second additional output;
First filter (the F that at least one is additional
T S), it is tunable to the possible wavelength (λ of carrier wave in the multiplexing of importing multiplexing and will inserting
1..., λ
N, λ "
1..., λ "
N) arbitrary wavelength, it also has an input to be connected to extra switch (SW
S) first output, a control input end and an output are arranged; And
Second filter (the F that at least one is additional
E S), it is tunable to the possible wavelength (λ of carrier wave in the multiplexing of importing multiplexing and will inserting
1..., λ
N, λ "
1..., λ "
N) arbitrary wavelength, it also has an input to be connected to second output of extra switch, and an output, provides a carrier wave that constitutes multiplexing (MT) part of extracting out.
6. according to each multiplexer of claim 1 to 4, it is characterized in that it also comprises one group of wavelength shifter (CL
1..., CL
N) and device (61), wavelength shifter give the carrier wave make new advances (λ '
1..., λ '
N), modulated signals modulation respectively of these new carrier waves, the entrained modulation signal of modulation signal and the carrier wave that first group of filter selected is identical, installs (61) then new carrier wave of providing of the described wavelength shifter group of Wave division multiplexing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB961991151A CN1148028C (en) | 1996-10-18 | 1996-10-18 | Optical spectral multiplexer for inserting and extracting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB961991151A CN1148028C (en) | 1996-10-18 | 1996-10-18 | Optical spectral multiplexer for inserting and extracting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1205817A true CN1205817A (en) | 1999-01-20 |
| CN1148028C CN1148028C (en) | 2004-04-28 |
Family
ID=5129328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB961991151A Expired - Fee Related CN1148028C (en) | 1996-10-18 | 1996-10-18 | Optical spectral multiplexer for inserting and extracting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1148028C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7133614B2 (en) | 2000-09-05 | 2006-11-07 | Hitachi Ltd | Optical multiple transmission method, optical network and optical transmission apparatus |
| CN100353694C (en) * | 1999-07-01 | 2007-12-05 | 艾利森电话股份有限公司 | Tuneable optical filter |
-
1996
- 1996-10-18 CN CNB961991151A patent/CN1148028C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353694C (en) * | 1999-07-01 | 2007-12-05 | 艾利森电话股份有限公司 | Tuneable optical filter |
| US7133614B2 (en) | 2000-09-05 | 2006-11-07 | Hitachi Ltd | Optical multiple transmission method, optical network and optical transmission apparatus |
| CN1297086C (en) * | 2000-09-05 | 2007-01-24 | 株式会社日立制作所 | Optical multiplex transmission method, optical network and optical transmission device |
| CN1976267B (en) * | 2000-09-05 | 2010-09-01 | 株式会社日立制作所 | Optical multiple transmission method, optical network and optical transmission apparatus |
| US7912373B2 (en) | 2000-09-05 | 2011-03-22 | Hitachi, Ltd. | Optical multiple transmission method, optical network and optical transmission apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1148028C (en) | 2004-04-28 |
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