CN102364884A - Passive-parallel-modulator-array-based light modulation method and device - Google Patents
Passive-parallel-modulator-array-based light modulation method and device Download PDFInfo
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Abstract
The invention relates to a passive-parallel-modulator-array-based light modulation method and a passive-parallel-modulator-array-based light modulation device. The method comprises that: N modulation symbols are generated in parallel from light signals transmitted by a light source by a multidimensional light modulation unit, wherein N is a natural number, and the modulation symbols form a complete modulation symbol space or a subset of the complete modulation symbol space; the multidimensional light modulation unit can modulate the light signals from one or more modulation dimensions of the light signals; and data is mapped to the modulation symbols by a modulation symbol selection unit to finish the modulation process of the data to the modulation symbols. By the light modulation method and the light modulation device provided by the invention, a passive-device-based modulator has the advantages of low power consumption, control simplicity and the like, and is easy to integrate and favorable for the miniaturization and integration of a modulation module and a transmitter.
Description
Technical field
The present invention relates to optical communication, light interconnection and optical information transmission technique field, is a kind of light modulating method and device based on passive parallel modulator array specifically.
Background technology
Along with the continuous propelling of social informatization process, existing optical transmission system can't satisfy growing interconnection rate requirement, the further elevator system transmission capacity of an urgent demand.Based on the multiplexing optical transmission system of optical wavelength frequency division, the caused narrow-band filtering effect of available bandwidth limits that the fibre loss window is caused and the cascade of transmission line optical device requires the spectrum efficiency maximization of optical transmission.If adopt the binary modulated form; The lifting of transmission rate certainly will cause baseband bandwidth to increase; Crosstalk between defective that the chromatic dispersion on the transmission channel, polarization mode dispersion, fiber nonlinear effect, optical device cascade narrow-band filtering effect, photoelectric device exist because of manufacture craft is imperfect and adjacency channel etc. to the influence aggravation of light signal, spectrum efficiency and fiber capacity can't get a promotion.This requires optical transmission system to make full use of light signal can to modulate dimension (amplitude, frequency, phase place, polarization state) and carry data.
Make full use of the modulated dimension of light signal; On a modulation symbol, carry a plurality of bit informations; Can effectively improve spectrum efficiency; Reduce the baud rate that modulation symbol sends, reduce baseband bandwidth and relevant with it chromatic dispersion and polarization mode dispersion, reduce requirement transmission channel and photoelectric device bandwidth.
At present, the multi-level light modulation of various dimensions is mostly based on the external modulation method of serial mode.As shown in Figure 1; The light signal that light source sends is successively through ovennodulation dimension A, B, the modulator A of C, B, C; Data drive A, B, C through filtering and encode and drive that directly to be carried in modulator A, B, C after the filtering respectively last, and modulator A, B, C modulate optical carrier on a modulation dimension at least.Thisly directly data load is required each modulator is equipped with switch and amplification driver spare to the modulator approach on the modulator.Continuous increase along with transmitter modulation dimension and modulation rate; External modulation method based on serial mode; The power consumption of its modulator switch and drive part constantly increases, and power supply and heat dissipation design are increasingly sophisticated, has limited the microminiaturization of modulation module and transmitter and integrated.
Summary of the invention
To the defective that exists in the prior art; The object of the present invention is to provide a kind of light modulating method and device based on passive parallel modulator array; Purpose is to remedy the weak point of prior art, and promptly prior art is along with the continuous increase of transmitter modulation dimension and modulation rate, and the power consumption of its modulator switch and drive part constantly increases; Power supply and heat dissipation design are increasingly sophisticated, have limited the microminiaturization of modulation module and transmitter and integrated.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of light modulating method based on passive parallel modulator array is characterized in that:
The light signal that light source sends produces N modulation symbol concurrently through the various dimensions light-modulating cell, and N is a natural number, and these modulation symbols constitute the subclass in a complete modulation symbol space or a complete modulation symbol space,
Said various dimensions light-modulating cell can be modulated light signal from one or more modulation dimensions of light signal;
Data are mapped to modulation symbol through the modulation symbol selected cell, accomplish the modulated process of data to modulation symbol.
On the basis of technique scheme, the modulation dimension of said light signal comprises: power level, phase place, frequency, polarization state.
On the basis of technique scheme; The modulated process that each road modulation symbol is experienced is identical; The parallel various dimensions light-modulating cell that produces the multichannel modulation symbol has array structure, and the difference of parallel each modulation symbol that produces depends on respectively modulates the difference that dimension attendes institute's corresponding modulating parameter in the modulated process.
A kind of passive parallel modulator array device that is used for above-mentioned light modulating method is characterized in that, comprising:
The various dimensions light-modulating cell of the light signal that the reception light source sends,
Receive the modulation symbol selected cell of data-signal,
The various dimensions light-modulating cell produces N modulation symbol concurrently, and is transferred to the modulation symbol selected cell.
On the basis of technique scheme, said various dimensions light-modulating cell comprises: luminous power allocation units, and these luminous power allocation units are provided with some modulation symbol branch roads,
Each modulation symbol branch road comprises some single dimension modulators that are connected in series, and each single dimension modulator is identical or part is identical or complete difference on each modulation symbol branch road.
On the basis of technique scheme, said various dimensions light-modulating cell comprises: at least three grades of light-modulating cells,
First order light-modulating cell comprises: the luminous power allocation units that link to each other with light source, and two modulators link to each other with these luminous power allocation units respectively,
Second level light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, and each luminous power allocation units links to each other with two modulators respectively,
Third level light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, each luminous power allocation units links to each other with two modulators respectively.
On the basis of technique scheme, said modulation symbol selected cell comprises: receive the clog-free optical switch module of the parallel modulation symbol in N road, said clog-free optical switch module comprises N light input end mouth and at least one optical output port.
On the basis of technique scheme; Said modulation symbol selected cell comprises: several clog-free optical switch modules; Said clog-free optical switch module comprises a light input end mouth and an optical output port, also has one to be used to receive the control port of separating the control signal that code decoder sends
Clog-free optical switch module is connected with the modulation symbol branch road one to one,
The optical output port of clog-free optical switch module is connected on same single output wave multiplexer, and said single output wave multiplexer comprises the light input end mouth identical with clog-free optical switch module quantity.
Light modulating method and device based on passive parallel modulator array of the present invention have based on the modulator of passive device and to be easy to integratedly, low in energy consumption, control advantages such as simple, help the microminiaturization of modulation module and transmitter and integrated.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1 shows the general implementation method of existing light modulation techniques,
Fig. 2 shows light modulation implementation method described in the invention,
Fig. 3 shows the realization example of a various dimensions light-modulating cell,
Fig. 4 shows an example in three dimensionality modulation symbol space,
Fig. 5 shows an example of light modulation implementation method described in the invention,
Fig. 6 shows an improvement example of various dimensions light-modulating cell,
Fig. 7 shows a realization example of modulation symbol selected cell,
Fig. 8 shows another realization example of modulation symbol selected cell,
Fig. 9 shows the present invention's applying examples under the palarization multiplexing situation.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Fig. 2 shows light modulation implementation method described in the invention, and is as shown in Figure 2, the light modulating method based on passive parallel modulator array of the present invention, wherein:
The light signal that light source sends produces N modulation symbol (light modulation symbol) concurrently through the various dimensions light-modulating cell, and N is a natural number, and these modulation symbols constitute the subclass in a complete modulation symbol space or a complete modulation symbol space,
Said various dimensions light-modulating cell can be modulated light signal from one or more modulation dimensions such as the power level of light signal, phase place, frequency, polarization states;
Data are mapped to modulation symbol through the modulation symbol selected cell, accomplish the modulated process of data to modulation symbol.
Among the present invention, produce one group of modulation symbol concurrently behind the light signal process various dimensions light-modulating cell that light source sends.The parallel modulation symbol that produces of this group constitutes the subclass in a complete modulation symbol space or a complete modulation symbol space.Data are mapped to the modulation symbol space through the modulation symbol selected cell.The modulated process that each road modulation symbol is experienced is identical; The parallel various dimensions light-modulating cell that produces the multichannel modulation symbol has array structure, and the difference of parallel each modulation symbol that produces depends on respectively modulates the difference that dimension attendes institute's corresponding modulating parameter in the modulated process.
In order to realize above-mentioned light modulation implementation method, the present invention has provided a kind of passive parallel modulator array device, comprising:
The various dimensions light-modulating cell of the light signal that the reception light source sends,
Receive the modulation symbol selected cell of data-signal,
The various dimensions light-modulating cell produces N modulation symbol concurrently, and is transferred to the modulation symbol selected cell.
On the basis of technique scheme, said various dimensions light-modulating cell comprises:
Luminous power allocation units, these luminous power allocation units are provided with some modulation symbol branch roads, and the modulation symbol that each branch road produced is through design or be provided with and remain unchanged after confirming,
Each modulation symbol branch road comprises some single dimension modulators that are connected in series, and each single dimension modulator is identical or part is identical or complete difference on each modulation symbol branch road.
Fig. 3 shows the realization example of a various dimensions light-modulating cell, and in this realization example: the light source that the various dimensions light-modulating cell is adopted on concrete the realization, can adopt single light source to concentrate or a plurality of distribution of light sources formulas provide.Luminous-power distributor is given each modulation symbol branch road with luminous power of light source etc.Each modulation symbol branch road comprises modulation dimension A, B, C, and light signal produces modulation symbol 0# successively behind the modulator A0 of ovennodulation dimension A, B, C, B0, C0; Light signal produces modulation symbol 1# successively behind the modulator A1 of ovennodulation dimension A, B, C, B1, C1; , the rest may be inferred.The modulation dimension A of modulator, B, C are that light signal can be modulated a kind of in the dimension (such as power level, phase place, frequency, polarization state etc.), can inequality or identical wholly or in part.
Modulation dimension A, B, C with three separate quadratures are example, if modulation dimension A can realize the M on this dimension
aThe level modulation, modulation dimension B can realize the M on this dimension
bThe level modulation, modulation dimension C can realize the M on this dimension
cLevel modulation, three modulation dimensions combine to constitute and comprise M
a* M
b* M
cThe modulation space of individual modulation symbol, M
a, M
b, M
cBe natural number.If single dimension modulator can be used for realizing the M level modulation of this dimension, n this single dimension modulator of series connection can be used for realizing the M to this dimension
nThe level modulation.Especially, when M=2, can realize on this modulation dimension 2
nThe level modulation.M, n are natural number.
Each modulator of modulating dimension can adopt active or the passive mode realization.The preferred modulator of respectively modulating dimension adopts passive device to realize, can comprise active device so that (single dimension modulator adopts passive device to realize that the modulation parameter on its corresponding modulating dimension is immutable to the setting of passive device parameter; Single dimension modulator inner packet can contain active device, and the modulation parameter on its corresponding modulating dimension can be adjusted.）。Based on the modulator of passive device, have and be easy to integratedly, low in energy consumption, control advantages such as simple.
Among the present invention, light source produces a plurality of modulation symbols concurrently through the various dimensions light-modulating cell, and these modulation symbols constitute the subclass in a complete modulation symbol space or a complete modulation symbol space.If the various dimensions light-modulating cell laterally only comprises three modulators on each modulation symbol branch road; And the modulation dimension of three modulators (being designated as modulation dimension A, modulation dimension B, modulation dimension C) has nothing in common with each other; Suppose that each modulator can realize secondary modulation then can obtaining modulation symbol space as shown in Figure 4 (three dimensionality modulation symbol space).This modulation symbol space comprises the modulation symbol of 8 inequalities, indicates with label 0,1,2,3,4,5,6,7 respectively.This shows that the modulator on every modulation symbol branch road is many more, the modulation dimension is many more, then can produce the modulation symbol of more inequality.
As shown in Figure 5, show an example of light modulation implementation method described in the invention.The light signal that light source sends is divided into 8 the tunnel through luminous power allocation units, adopts label 0,1,2,3,4,5,6,7 to indicate respectively.Each road light signal produces 8 different modulation symbols after having passed through three optical modulators, and each modulator is distinguished with the branch road label of correspondence respectively with the modulation symbol that is produced:
Vertically, modulator A0, A1 ..., A7 is the modulator of same modulation dimension; Modulator B0, B1 ..., B7 is the modulator of same modulation dimension; Modulator C0, C1 ..., C7 is the modulator of same modulation dimension;
Transversely, label is that the modulation dimension of modulator Am, modulator Bm, modulator Cm on m (m=0,1,2,3,4,5,6, the 7) branch road can inequality or identical or part is identical;
Modulator A0, A1 ..., A7, B0, B1 ..., B7, C0, C1 ..., C7 constitutes the modulator array of this example various dimensions light-modulating cell.
With the modulation dimension of transversely three modulation of each branch road (being designated as modulation dimension A, modulation dimension B, modulation dimension C) inequality is example, supposes that each modulator can realize the secondary modulation, then can obtain modulation symbol space as shown in Figure 4.This modulation symbol space comprises the modulation symbol of 8 inequalities, indicates with label 0,1,2,3,4,5,6,7 respectively.Each modulator parameter in appropriate design or the setting various dimensions light-modulating cell can make that the label of the modulation symbol that each branch road produces is consistent with the branch road label.
As shown in Figure 5, arrive the modulation symbol selected cell simultaneously through parallel 8 road modulation symbols that produce of various dimensions light-modulating cell, be used for the data map of 3bit.Generally speaking, can do following design to this example:
Institute's modulated data sequence is divided into the data slot of 3bit, in the unit interval of each modulation with the 3bit data map to data the modulation symbol of corresponding decimal system label.According to above-mentioned rule:
When data=000; It is 0 the modulation symbol branch road and the optical output port conducting of modulation symbol selected cell that the modulation symbol selected cell makes the label of various dimensions light-modulating cell output through the control optical switch; Export label as shown in Figure 4 and be 0 modulation symbol; Realize that data data=000 is the mapping of 0 modulation symbol to label, completion data data=000 is to the modulation of light carrier symbol;
When data=001; It is 1 the modulation symbol branch road and the optical output port conducting of modulation symbol selected cell that the modulation symbol selected cell makes the label of various dimensions light-modulating cell output through the control optical switch; Export label as shown in Figure 4 and be 1 modulation symbol; Realize that data data=001 is the mapping of 1 modulation symbol to label, completion data data=001 is to the modulation of light carrier symbol; , the rest may be inferred.
On the basis of technique scheme, said various dimensions light-modulating cell comprises: at least three grades of light-modulating cells,
First order light-modulating cell comprises: the luminous power allocation units that link to each other with light source, and two modulators link to each other with these luminous power allocation units respectively,
Second level light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, and each luminous power allocation units links to each other with two modulators respectively,
Third level light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, each luminous power allocation units links to each other with two modulators respectively.
When more multistage light-modulating cell is set; Get final product according to the aforesaid way stack; For example: fourth stage light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, each luminous power allocation units links to each other with two modulators respectively.
Fig. 6 shows the improvement example of a various dimensions light-modulating cell, and this improves in the example:
Constitute in the modulator array of various dimensions light-modulating cell; If the input and output light signal of a plurality of modulation symbol branch roads on same modulation dimension identical (under the situation that does not influence performance), these a plurality of modulation symbol branch roads can should be modulated the modulator unit on the dimension through luminous-power distributor is shared.Shown in Figure 5 like example:
When the input and output light signal of A0, A1, A2, A3 modulator identical; The input and output light signal of A4, A5, A6, A7 modulator is identical; The input and output light signal of B0, B1 modulator is identical; The input and output light signal of B2, B3 modulator is identical; The input and output light signal of B4, B5 modulator is identical, and the input and output light signal of B6, B7 modulator is identical, then with the quantity of the various dimensions light-modulating cell in the various dimensions light-modulating cell alternate figures 5 shown in Figure 6 with modulator unit in the minimizing modulator array.
As shown in Figure 6, the light signal of light source is difference input modulator A0 and modulator A4 behind the branches such as luminous power allocation units of the first order; Modulator A0 output light signal difference input modulator B0 and modulator B2 behind branches such as partial luminous-power distributor A0, modulator A4 output light signal difference input modulator B4 and modulator B6 behind branches such as partial luminous-power distributor A4; Modulator B0 output light signal difference input modulator C0 and modulator C1 behind the branches such as luminous-power distributor B0 of the third level; Modulator B2 output light signal difference input modulator C2 and modulator C3 behind the branches such as luminous-power distributor B2 of the third level; Modulator B4 output light signal difference input modulator C4 and modulator C5 behind the branches such as luminous-power distributor B4 of the third level, modulator B6 output light signal difference input modulator C6 and modulator C7 behind the branches such as luminous-power distributor B6 of the third level.
On the basis of technique scheme, said modulation symbol selected cell comprises:
Receive the clog-free optical switch module of the parallel modulation symbol in N road, said clog-free optical switch module comprises N light input end mouth and at least one optical output port.
Fig. 7 shows a realization example of modulation symbol selected cell, and in this realization example: for the parallel modulation symbol in N road, the modulation symbol selected cell comprises one and has the clog-free optical switch module of N light input end mouth and at least one optical output port at least.The N road modulation symbol of various dimensions light-modulating cell and line output is introduced the N road light input end mouth of clog-free optical switch module.The public output port that an optical output port of clog-free optical switch module is confirmed as the modulation symbol selected cell.Modulating data acts on the control end of clog-free optical switch module, optionally confirms an input port and a definite public output port conducting of clog-free optical switch module.N is a natural number.That is: modulating data is introduced the control end of optical switch module, realizes the mapping of modulating data to modulation symbol through the conducting of selecting control light input end mouth and the public optical output port of confirming.
On the basis of technique scheme, said modulation symbol selected cell comprises:
Several clog-free optical switch modules, said clog-free optical switch module comprise a light input end mouth and an optical output port, also have one to be used to receive the control port of separating the control signal that code decoder sends,
Clog-free optical switch module is connected with the modulation symbol branch road one to one,
The optical output port of clog-free optical switch module is connected on same single output wave multiplexer, and said single output wave multiplexer comprises the light input end mouth identical with clog-free optical switch module quantity.
Fig. 8 shows another realization example of modulation symbol selected cell, and in this realization example: for the parallel modulation symbol in N road, the modulation symbol selected cell comprises N 1 * 1 optical switch and one and has single wave multiplexer of exporting of N light input end mouth at least.The N road modulation symbol of various dimensions light-modulating cell and line output is introduced the light input end mouth of N 1 * 1 optical switch respectively.The optical output port of N 1 * 1 optical switch links to each other with N light input end mouth of wave multiplexer respectively.The optical output port of wave multiplexer is as the optical output port of modulation symbol selected cell.Modulating data is drawn N road control signal through decoder, and the control port with N 1 * 1 optical switch is connected respectively.1 * 1 optical switch is in normally off, and modulating data is realized corresponding modulating symbol branch road and the conducting of wave multiplexer optical output port through selecting control 1 * 1 optical switch conducting.N is a natural number.
According to the invention with the device of data signal modulation to light carrier, its modulation symbol selected cell can be realized through dual mode.
First kind of implementation: for the parallel modulation symbol in N road, the modulation symbol selected cell comprises one and has the clog-free optical switch module of N light input end mouth and at least one optical output port at least.The N road modulation symbol of various dimensions light-modulating cell and line output is introduced the N road light input end mouth of clog-free optical switch module.The public output port that an optical output port of clog-free optical switch module is confirmed as the modulation symbol selected cell.Modulating data acts on the control end of clog-free optical switch module, optionally confirms an input port and a definite public output port conducting of clog-free optical switch module.N is a natural number.
Second kind of implementation: for the parallel modulation symbol in N road, the modulation symbol selected cell comprises N 1 * 1 optical switch and one and has single wave multiplexer of exporting of N light input end mouth at least.The N road modulation symbol of various dimensions light-modulating cell and line output is introduced the light input end mouth of N 1 * 1 optical switch respectively.The optical output port of N 1 * 1 optical switch links to each other with N light input end mouth of wave multiplexer respectively.The optical output port of wave multiplexer is as the optical output port of modulation symbol selected cell.Modulating data is drawn N road control signal through decoder, and the control port with N 1 * 1 optical switch is connected respectively.1 * 1 optical switch is in normally off, and modulating data is realized corresponding modulating symbol branch road and the conducting of wave multiplexer optical output port through selecting control 1 * 1 optical switch conducting.N is a natural number.
Fig. 9 shows the present invention's applying examples under the palarization multiplexing situation.
In the applied environment of palarization multiplexing, can independently modulate the light signal of each polarization state, the modulation symbol of two different polarization states that modulation is obtained through cross-polarization Shu Hebo to same guided wave space.
Shown in Figure 9 like example, polarized light source X and polarized light source Y are mutually orthogonal optical carrier of two-way polarization state or signal source.
Polarized light source X is connected to the light input end mouth of various dimensions light-modulating cell X, and through the parallel N road modulation symbol that produces of various dimensions light-modulating cell X, these modulation symbols constitute the subclass in a complete modulation symbol space or a complete modulation symbol space; The parallel N road modulation symbol that produces of various dimensions light-modulating cell X is introduced N the light input end mouth of modulation symbol selected cell X; Data X selects the corresponding modulation symbol to output to the optical output port of modulation symbol selected cell X through modulation symbol selected cell X, accomplishes the symbol-modulated of data X to the polarized light source X.
Same; Polarized light source Y is connected to the light input end mouth of various dimensions light-modulating cell Y; Through the parallel N road modulation symbol that produces of various dimensions light-modulating cell Y, these modulation symbols constitute the subclass in a complete modulation symbol space or a complete modulation symbol space; The parallel N road modulation symbol that produces of various dimensions light-modulating cell Y is introduced N the light input end mouth of modulation symbol selected cell Y; Data Y selects the corresponding modulation symbol to output to the optical output port of modulation symbol selected cell Y through modulation symbol selected cell Y, accomplishes the symbol-modulated of data Y to the polarized light source Y.N is a natural number.
Data X is separate to the symbol-modulated process on the polarized light source Y to symbol-modulated process and data Y on the polarized light source X, and each road light signal polarization state remains unchanged.Two-way closes ripple to same guided wave space by the light signal of modulation symbol selected cell X and modulation symbol selected cell Y completion data map modulation output through cross-polarization respectively.
Characteristics of the present invention can be summarized as follows:
1. the present invention is a kind of with the method for data signal modulation to light carrier, and this method may further comprise the steps:
Produce the multichannel modulation symbol concurrently after the modulation of one or more optical carrier at least one modulation dimension in polarization state, amplitude, phase place and frequency.
Data realize through its selection to the multichannel modulation symbol to the modulation mapping of light modulation symbol.
2. parallel each branch road modulation symbol that produces has nothing in common with each other, and constitutes the subclass in a complete modulation symbol space or a complete modulation symbol space.
3. the difference of each branch road modulation symbol depends on and respectively modulates the difference that dimension attendes institute's corresponding modulating parameter in the modulated process.
4. the modulation symbol that each branch road produced is through design or be provided with and remain unchanged after confirming.
5. in the parallel production process of multichannel modulation symbol, the modulated process that optical carrier experienced on each modulation symbol branch road is identical.
6. in the parallel production process of multichannel modulation symbol, the modulator that produces each modulation symbol adopts passive device to realize, can comprise active device so that to the setting of passive device parameter.
7. the parallel multichannel modulation symbol that produces arrives modulation symbol selected cell (node) simultaneously.
Modulation symbol selected cell (node) according to the difference of data-signal from the parallel multichannel modulation symbol that produces modulation symbol of unique selection as the output light signal of node.
9. the present invention has provided a kind of passive parallel modulator array device, and this device comprises:
A various dimensions light-modulating cell comprises at least one light input end mouth and N optical output port.
A modulation symbol selected cell comprises N light input end mouth, an optical output port and at least one control port.
The N of a various dimensions light-modulating cell optical output port links to each other with N light input end mouth of modulation symbol selected cell respectively; The light input end mouth of various dimensions light-modulating cell is used to connect the carrier wave light source or introduces optical carrier, as the light input end mouth of this device; The optical output port of modulation symbol selected cell is used to draw the light modulation symbol of accomplishing data map, as the optical output port of this device; The control port of modulation symbol selected cell is used to introduce the data that need be modulated to light carrier, as the control port of this device.N is a natural number.
One or more light carrier produces the multichannel modulation symbol concurrently through the various dimensions modulating unit, and this multichannel modulation symbol constitutes the subclass in a complete modulation symbol space or a complete modulation symbol space.Data are mapped to modulation symbol through the modulation symbol selected cell, accomplish the modulated process of data to the light modulation symbol.
10. the one or more modulation dimensions of various dimensions modulating unit from electromagnetic field magnitude, phase place, frequency and the polarization state of light signal are modulated optical carrier.
11. the various dimensions modulating unit is by the realization that is together in series of one or more identical or different single dimension modulators, on each modulation symbol branch road each single dimension modulator can inequality also can be identical wholly or in part.The single dimension modulator that constitutes the various dimensions modulating unit is array distribution.
12. the input optical carrier of various dimensions modulating unit is concentrated by single light source and is provided.Can adopt luminous-power distributor that luminous power of light source etc. is given each parallel modulation branch.
13. the input optical carrier of various dimensions modulating unit is provided by a plurality of distribution of light sources formulas.Can adopt luminous-power distributor that the luminous power of light source etc. is given corresponding parallel modulation branch.
14. for the parallel modulation symbol in N road, the modulation symbol selected cell comprises one and has the clog-free optical switch module of N light input end mouth and at least one optical output port at least.The N road modulation symbol of various dimensions modulating unit and line output is introduced the N road light input end mouth of clog-free optical switch module.The public output port that an optical output port of clog-free optical switch module is confirmed as the modulation symbol selected cell.Modulating data acts on the control end of clog-free optical switch module, optionally confirms an input port and a definite public output port conducting of clog-free optical switch module.N is a natural number.
15. for the parallel modulation symbol in N road, the modulation symbol selected cell comprises N 1 * 1 optical switch and one and has single wave multiplexer of exporting of N light input end mouth at least.The N road modulation symbol of various dimensions modulating unit and line output is introduced the light input end mouth of N 1 * 1 optical switch respectively.The optical output port of N 1 * 1 optical switch links to each other with N light input end mouth of wave multiplexer respectively.The optical output port of wave multiplexer is as the optical output port of modulation symbol selected cell.Modulating data is drawn N road control signal through decoder, and the control port with N 1 * 1 optical switch is connected respectively.1 * 1 optical switch is in normally off, and modulating data is realized corresponding modulating symbol branch road and the conducting of wave multiplexer optical output port through selecting control 1 * 1 optical switch conducting.N is a natural number.
16. but the modulation dimension of single dimension modulator from separate modulation dimensions such as the electromagnetic field intensity of light signal, phase place, frequency, polarization state modulated optical carrier.
17. single dimension modulator adopts passive device to realize that the modulation parameter on its corresponding modulating dimension is immutable.
18. single dimension modulator inner packet contains active device, the modulation parameter on its corresponding modulating dimension can be adjusted.
The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (8)
1. light modulating method based on passive parallel modulator array is characterized in that:
The light signal that light source sends produces N modulation symbol concurrently through the various dimensions light-modulating cell, and N is a natural number, and these modulation symbols constitute the subclass in a complete modulation symbol space or a complete modulation symbol space,
Said various dimensions light-modulating cell can be modulated light signal from one or more modulation dimensions of light signal;
Data are mapped to modulation symbol through the modulation symbol selected cell, accomplish the modulated process of data to modulation symbol.
2. the light modulating method based on passive parallel modulator array as claimed in claim 1 is characterized in that: the modulation dimension of said light signal comprises: power level, phase place, frequency, polarization state.
3. according to claim 1 or claim 2 light modulating method based on passive parallel modulator array; It is characterized in that: the modulated process that each road modulation symbol is experienced is identical; The parallel various dimensions light-modulating cell that produces the multichannel modulation symbol has array structure, and the difference of parallel each modulation symbol that produces depends on respectively modulates the difference that dimension attendes institute's corresponding modulating parameter in the modulated process.
4. a passive parallel modulator array device that is used for the said light modulating method of claim 1 is characterized in that, comprising:
The various dimensions light-modulating cell of the light signal that the reception light source sends,
Receive the modulation symbol selected cell of data-signal,
The various dimensions light-modulating cell produces N modulation symbol concurrently, and is transferred to the modulation symbol selected cell.
5. passive parallel modulator array device as claimed in claim 4 is characterized in that said various dimensions light-modulating cell comprises: luminous power allocation units, and these luminous power allocation units are provided with some modulation symbol branch roads,
Each modulation symbol branch road comprises some single dimension modulators that are connected in series, and each single dimension modulator is identical or part is identical or complete difference on each modulation symbol branch road.
6. passive parallel modulator array device as claimed in claim 4 is characterized in that said various dimensions light-modulating cell comprises: at least three grades of light-modulating cells,
First order light-modulating cell comprises: the luminous power allocation units that link to each other with light source, and two modulators link to each other with these luminous power allocation units respectively,
Second level light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, and each luminous power allocation units links to each other with two modulators respectively,
Third level light-modulating cell comprises: the luminous power allocation units that are connected one to one with the modulator of previous stage respectively, each luminous power allocation units links to each other with two modulators respectively.
7. passive parallel modulator array device as claimed in claim 4; It is characterized in that; Said modulation symbol selected cell comprises: receive the clog-free optical switch module of the parallel modulation symbol in N road, said clog-free optical switch module comprises N light input end mouth and at least one optical output port.
8. passive parallel modulator array device as claimed in claim 4; It is characterized in that; Said modulation symbol selected cell comprises: several clog-free optical switch modules; Said clog-free optical switch module comprises a light input end mouth and an optical output port, also has one to be used to receive the control port of separating the control signal that code decoder sends
Clog-free optical switch module is connected with the modulation symbol branch road one to one,
The optical output port of clog-free optical switch module is connected on same single output wave multiplexer, and said single output wave multiplexer comprises the light input end mouth identical with clog-free optical switch module quantity.
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| US20110222858A1 (en) * | 2010-03-09 | 2011-09-15 | Kddi R&D Laboratories Inc. | Optical communication apparatus and optical communication method |
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| CN101383661A (en) * | 2007-09-04 | 2009-03-11 | 日本电气株式会社 | Optical transmitter and control method thereof |
| US20110222858A1 (en) * | 2010-03-09 | 2011-09-15 | Kddi R&D Laboratories Inc. | Optical communication apparatus and optical communication method |
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