CN102723985A - Bandwidth optimization and design method for optical frequency code chips of spectral amplitude encoding/decoding system - Google Patents
Bandwidth optimization and design method for optical frequency code chips of spectral amplitude encoding/decoding system Download PDFInfo
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- CN102723985A CN102723985A CN2012102140125A CN201210214012A CN102723985A CN 102723985 A CN102723985 A CN 102723985A CN 2012102140125 A CN2012102140125 A CN 2012102140125A CN 201210214012 A CN201210214012 A CN 201210214012A CN 102723985 A CN102723985 A CN 102723985A
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Abstract
The invention discloses a bandwidth optimization and design method for optical frequency code chips of a spectral amplitude encoding/decoding system, belonging to the field of free space optical communication technologies. According to the bandwidth optimization and design method, laser signals sent by the spectral amplitude encoding system are received and recorded firstly by using a linear-array photoelectric detector, a data acquisition card and a computer, and the number of the optical frequency code chips and the sub-optical frequency band distributed for each optical frequency code chip are then calculated and optimized according to output signal intensity histograms of detection units of the linear-array photoelectric detector. The detection signal-to-noise ratio sizes of sub-channels corresponding to the optical frequency code chips can be furthest guaranteed to be equal by using the bandwidth optimization and design method, so that the waste of the output power of a wide-spectrum light source is avoided, and the performance of a free space optical communication system which uses a spectral amplitude encoding/decoding method is improved.
Description
Technical field
The invention belongs to the free space optical communication technology field, relate to the optical frequency chip bandwidth optimization method for designing of a kind of spectrum amplitude coding/decoding system.
Background technology
One piece of title during " Optics Communications " rolled up in 2007 280 has been described a kind of spectrum amplitude coding optical system that is used for FSO for the paper of " Suppression of Intensity Fluctuations in Free Space High-Speed Optical Communication based on Spectral Encoding of a Partially Coherent Beam ".This article when the design problem of optical frequency chip bandwidth is discussed, consideration be the mode of distributing identical big or small bandwidth for each optical frequency chip, promptly the overall optical frequency band of wide range light signal is evenly divided, be that each optical frequency chip distributes a sub-optical frequency band.Actual wide spectrum light source output signal frequency is often composed and non-uniform Distribution, i.e. the power of the optical frequency signal component of different frequency and inequality.Therefore; The mode of the overall optical frequency band through even division wide range light signal comes can cause the actual signal power of getting of different optical frequency chips to exist than big-difference for each optical frequency chip divides gamete optical frequency band; This possibly cause the detection signal to noise ratio of the corresponding subchannel of the less optical frequency chip of signal power lower, thereby causes the bigger communication error rate.In addition, the output of actual light electric explorer response all has wavelength dependency, therefore when distributing the bandwidth of optical frequency chip, need consider the influence of detector output response.Because each optical frequency chip data carried by data transmission rate is the same; Therefore through suitable design; Guarantee the detection signal to noise ratio equal and opposite in direction of the subchannel that each optical frequency chip is corresponding, just can avoid waste, and then realize the optimization of overall communication performance the wide spectrum light source power output.
Summary of the invention
The optical frequency chip bandwidth optimization method for designing that the purpose of this invention is to provide a kind of spectrum amplitude coding/decoding system.As shown in Figure 1, the spectrum amplitude coded system is made up of with driver module 109 wide spectrum light source 101, convex lens 102, convex lens 110, spectrum grating 103, speculum 107, linear array electrooptical liquid crystal spatial light modulator 104, speculum 108, spectrum grating 105, convex lens 111, convex lens 106, coding control; Behind the light signal A001 process convex lens 102 and convex lens 110 conversion of wide spectrum light source 101 outputs; Incide on the spectrum grating 103; 103 couples of light signal A001 of spectrum grating carry out beam split, and the optical signal component of different frequency is spatially separated, and after speculum 107 reflections, incide on the linear array electrooptical liquid crystal spatial light modulator 104 again; Incide on the spectrum grating 105 after speculum 108 reflections from the light signal of linear array electrooptical liquid crystal spatial light modulator 104 transmissions; 105 pairs of each optical frequency signal components of spectrum grating are carried out the space and are merged, and the light signal after the merging after planoconvex lens 111 and convex lens 106 conversion, finally is transmitted in the free space channel again; Coding control links to each other with linear array electrooptical liquid crystal spatial light modulator 104 with driver module 109, can control the state of each pixel A 002 of linear array electrooptical liquid crystal spatial light modulator 104 through coding control and driver module 109.As shown in Figure 2, the spectrum amplitude decode system is made up of optical receiver antenna 201, spectrum spectral module 202, convex lens 203, linear array photodetector 204, decoding process module 205, linear array photodetector data collecting card and computer; The light signal that optical receiver antenna 201 receives carries out beam split through spectrum spectral module 202; Each optical frequency signal component of the light signal that optical receiver antenna 201 receives is spatially separated; Incide on the linear array photodetector 204 after each optical frequency signal component planoconvex lens 203 conversion that separates on the space, accomplish decoding work through decoding process module 205 at last; Each pixel A 002 of linear array electrooptical liquid crystal spatial light modulator 104 is equivalent to a switch; When a pixel A 002 is in " open-minded " state; The optical frequency signal component that incides on the pixel A 002 can see through; When a pixel A 002 was in " closure " state, the optical frequency signal component that incides on the pixel A 002 can not see through; Through being convex lens 102, convex lens 110, the suitable focal length parameter of convex lens 203 designs; The number by the probe unit that is covered by light signal of light signal covered pixels number and linear array photodetector 204 of linear array electrooptical liquid crystal spatial light modulator 104 is equated; Thereby make each pixel of linear array electrooptical liquid crystal spatial light modulator 104 and each probe unit of linear array photodetector 204 form relation one to one; Even linear array electrooptical liquid crystal spatial light modulator 104 pixel is set to " closure " state, and will cause the intensity of incident optical frequency signal component of the probe unit of corresponding with it linear array photodetector 204 is 0.
Method of the present invention realizes through following steps:
Step001: all be installed in spectrum amplitude coded system and spectrum amplitude decode system on the optical table; On optical table, the convex lens 106 of spectrum amplitude coded system and the optical receiver antenna 201 of spectrum amplitude decode system are carried out optical axis alignment, the light signal of spectrum amplitude coded system emission can be got in the spectrum amplitude decode system;
Step002: make wide spectrum light source 101 emission light signals; Coding control is simultaneously all exported " open-minded " signal with driver module 109 to each pixel of linear array electrooptical liquid crystal spatial light modulator 104, and all optical frequency signal components that make speculum 107 reflections are all from linear array electrooptical liquid crystal spatial light modulator 104 transmissive;
Step003: receive and record by linear array photodetector data collecting card and computer detectable signal data to linear array photodetector 204; Thereby obtain the output signal strength A003 of each probe unit of linear array photodetector 204, the output signal strength A003 of each probe unit is left among the array H; Each probe unit with linear array photodetector 204 is the transverse axis variable, is longitudinal axis variable with the value among the array H, the histogram A004 that can draw as shown in Figure 3, each rectangular output signal strength of representing a probe unit among Fig. 3; The wavelength dependency of the non-uniform Distribution characteristic of the frequency spectrum of wide spectrum light source 101 output light signals and the 204 output responses of linear array photodetector makes histogram A004 also demonstrate inhomogeneities; The output signal strength of some probe units that is linear array photodetector 204 is relatively large, and the output signal strength of other probe unit is less relatively; In Fig. 3, the output signal strength of the output signal strength ratio detection unit 306 of probe unit 301, probe unit 302, probe unit 303, probe unit 304, probe unit 305, probe unit 307, probe unit 308 is big.
Step004: in computer, carry out following steps, so that confirm the optical frequency number of chips N of the optimization of spectrum amplitude coded system
1And the sub-optical frequency band got of each optical frequency chip:
S004-1: specify the maximum optical frequency number of chips N that allows
MaxSize, with N
1Be initialized as 0;
S004-2: the output signal strength sum S that calculates all probe units of linear array photodetector 204;
S004-3: find out the maximum sequence number i of elements A 005 in array H of array H intermediate value
Max, the value of elements A 005 can be written as H (i
Max);
S004-4: if H is (i
Max)>=S/N
Max, be i then with sequence number
MaxThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M is initialized as 0, otherwise: 1. find out and satisfy condition
And i
Max+ m is no more than the maximum nonnegative integer m of the probe unit number of linear array photodetector 204, and its value is kept among the variable M; 2. be i with sequence number
Max, i
Max+ 1 ..., i
MaxThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of+M is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-5: carry out i
s=i
MaxIf+M+1 is i
sGreater than the probe unit number of linear array photodetector 204, then change S004-8;
S004-6: if H is (i
s)>=S/N
Max, be i then with sequence number
sThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M ' is initialized as 0, otherwise: 1. find out and satisfy condition
And i
s+ m is no more than the maximum nonnegative integer m of the probe unit number of linear array photodetector 204, and its value is kept among the variable M '; 2. be i with sequence number
s, i
s+ 1 ..., i
sThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of+M ' is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-7: carry out i
s=i
sIf+M '+1 is i
sGreater than the probe unit number of linear array photodetector 204, then change S004-8; Otherwise change S004-6;
S004-8: carry out i
s=i
Max-1, if i
sLess than 1, then change Step005;
S004-9: if H is (i
s)>=S/N
Max, be i then with sequence number
sThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M ' is initialized as 0, otherwise: 1. find out and satisfy condition
And i
sThe maximum nonnegative integer m of-m>=1 is kept at its value among the variable M '; 2. be i with sequence number
s, i
s-1 ..., i
sThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of-M ' is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-10: carry out i
s=i
sIf-M '-1 is i
sLess than 1, then change Step005, otherwise change S004-9;
Step005: for each optical frequency chip that abovementioned steps is confirmed, press the order from the low frequency to the high frequency, if the output signal strength sum B002 of the probe unit of all linear array photodetectors 204 of an optical frequency chip B001 correspondence is less than S/ (2 * N
Max); Then: with an optical frequency chip B001 and an adjacent optical frequency chip of optical frequency chip merging becoming; Selecting the criterion of the adjacent optical frequency chip that institute will merge is that the output signal strength sum B003 of the probe unit of all linear array photodetectors 204 that adjacent optical frequency chip is corresponding is minimum, has only an adjacent optical frequency chip as if optical frequency chip B001; Then the unique adjacent optical frequency chip with it merges, and carries out N
1=N
1-1.
Through above-mentioned steps, the optical frequency number of chips N that can be optimized
1, and divide gamete optical frequency band for each optical frequency chip, thus the bandwidth Design of each optical frequency chip accomplished.
Because each pixel of linear array electrooptical liquid crystal spatial light modulator 104 and each probe unit of linear array photodetector 204 have one-to-one relationship; Therefore in the spectrum amplitude coded system; Can confirm the pixel sequence number of the linear array electrooptical liquid crystal spatial light modulator 104 that each optical frequency chip is corresponding according to the probe unit sequence number of the corresponding linear array photodetector 204 of each optical frequency chip; Coding control and driver module 109 are when the output encoder control signal; The pixel of all linear array electrooptical liquid crystal spatial light modulators 104 that each optical frequency chip is corresponding is used as an integral body, promptly exports identical coding control signal to the pixel of all corresponding linear array electrooptical liquid crystal spatial light modulators 104 of same optical frequency chip; In the decoding process module 205 of spectrum amplitude decode system, the output signal strength of the probe unit of all earlier that each optical frequency chip is corresponding linear array photodetectors 204 is accumulated in together, carries out decoding operation again.
Beneficial effect
The invention provides the optical frequency chip bandwidth optimization method for designing of a kind of spectrum amplitude coding/decoding system.The inventive method can be confirmed the optical frequency number of chips of optimization and the sub-optical frequency band that each optical frequency chip is got according to the frequency spectrum distribution character of wide spectrum light source and the wavelength dependency of linear array photodetector output response; Can farthest guarantee the detection signal to noise ratio equal and opposite in direction of the subchannel that each optical frequency chip is corresponding; Thereby the power output of the wide spectrum light source that avoids waste, the performance of the free-space optical communication system of spectrum amplitude coding/decoding method is used in lifting.
Description of drawings
Fig. 1 is the structural representation of spectrum amplitude coded system, and Fig. 2 is the structural representation of spectrum amplitude decode system, and Fig. 3 is each probe unit output signal strength histogram of linear array photodetector.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.As shown in Figure 1, the spectrum amplitude coded system is made up of with driver module 109 wide spectrum light source 101, convex lens 102, convex lens 110, spectrum grating 103, speculum 107, linear array electrooptical liquid crystal spatial light modulator 104, speculum 108, spectrum grating 105, convex lens 111, convex lens 106, coding control; Behind the light signal A001 process convex lens 102 and convex lens 110 conversion of wide spectrum light source 101 outputs; Incide on the spectrum grating 103; 103 couples of light signal A001 of spectrum grating carry out beam split, and the optical signal component of different frequency is spatially separated, and after speculum 107 reflections, incide on the linear array electrooptical liquid crystal spatial light modulator 104 again; Incide on the spectrum grating 105 after speculum 108 reflections from the light signal of linear array electrooptical liquid crystal spatial light modulator 104 transmissions; 105 pairs of each optical frequency signal components of spectrum grating are carried out the space and are merged, and the light signal after the merging after planoconvex lens 111 and convex lens 106 conversion, finally is transmitted in the free space channel again; Coding control links to each other with linear array electrooptical liquid crystal spatial light modulator 104 with driver module 109, can control the state of each pixel A 002 of linear array electrooptical liquid crystal spatial light modulator 104 through coding control and driver module 109.As shown in Figure 2, the spectrum amplitude decode system is made up of optical receiver antenna 201, spectrum spectral module 202, convex lens 203, linear array photodetector 204, decoding process module 205, linear array photodetector data collecting card and computer; The light signal that optical receiver antenna 201 receives carries out beam split through spectrum spectral module 202; Each optical frequency signal component of the light signal that optical receiver antenna 201 receives is spatially separated; Incide on the linear array photodetector 204 after each optical frequency signal component planoconvex lens 203 conversion that separates on the space, accomplish decoding work through decoding process module 205 at last; Each pixel A 002 of linear array electrooptical liquid crystal spatial light modulator 104 is equivalent to a switch; When a pixel A 002 is in " open-minded " state; The optical frequency signal component that incides on the pixel A 002 can see through; When a pixel A 002 was in " closure " state, the optical frequency signal component that incides on the pixel A 002 can not see through; Through being convex lens 102, convex lens 110, the suitable focal length parameter of convex lens 203 designs; The number by the probe unit that is covered by light signal of light signal covered pixels number and linear array photodetector 204 of linear array electrooptical liquid crystal spatial light modulator 104 is equated; Thereby make each pixel of linear array electrooptical liquid crystal spatial light modulator 104 and each probe unit of linear array photodetector 204 form relation one to one; Even linear array electrooptical liquid crystal spatial light modulator 104 pixel is set to " closure " state, and will cause the intensity of incident optical frequency signal component of the probe unit of corresponding with it linear array photodetector 204 is 0.
Method of the present invention realizes through following steps:
Step001: all be installed in spectrum amplitude coded system and spectrum amplitude decode system on the optical table; On optical table, the convex lens 106 of spectrum amplitude coded system and the optical receiver antenna 201 of spectrum amplitude decode system are carried out optical axis alignment, the light signal of spectrum amplitude coded system emission can be got in the spectrum amplitude decode system;
Step002: make wide spectrum light source 101 emission light signals; Coding control is simultaneously all exported " open-minded " signal with driver module 109 to each pixel of linear array electrooptical liquid crystal spatial light modulator 104, and all optical frequency signal components that make speculum 107 reflections are all from linear array electrooptical liquid crystal spatial light modulator 104 transmissive;
Step003: receive and record by linear array photodetector data collecting card and computer detectable signal data to linear array photodetector 204; Thereby obtain the output signal strength A003 of each probe unit of linear array photodetector 204, the output signal strength A003 of each probe unit is left among the array H; Each probe unit with linear array photodetector 204 is the transverse axis variable, is longitudinal axis variable with the value among the array H, the histogram A004 that can draw as shown in Figure 3, each rectangular output signal strength of representing a probe unit among Fig. 3; The wavelength dependency of the non-uniform Distribution characteristic of the frequency spectrum of wide spectrum light source 101 output light signals and the 204 output responses of linear array photodetector makes histogram A004 also demonstrate inhomogeneities; The output signal strength of some probe units that is linear array photodetector 204 is relatively large, and the output signal strength of other probe unit is less relatively; In Fig. 3, the output signal strength of the output signal strength ratio detection unit 306 of probe unit 301, probe unit 302, probe unit 303, probe unit 304, probe unit 305, probe unit 307, probe unit 308 is big.
Step004: in computer, carry out following steps, so that confirm the optical frequency number of chips N of the optimization of spectrum amplitude coded system
1And the sub-optical frequency band got of each optical frequency chip:
S004-1: specify the maximum optical frequency number of chips N that allows
MaxSize, with N
1Be initialized as 0;
S004-2: the output signal strength sum S that calculates all probe units of linear array photodetector 204;
S004-3: find out the maximum sequence number i of elements A 005 in array H of array H intermediate value
Max, the value of elements A 005 can be written as H (i
Max);
S004-4: if H is (i
Max)>=S/N
Max, be i then with sequence number
MaxThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M is initialized as 0, otherwise: 1. find out and satisfy condition
And i
Max+ m is no more than the maximum nonnegative integer m of the probe unit number of linear array photodetector 204, and its value is kept among the variable M; 2. be i with sequence number
Max, i
Max+ 1 ..., i
MaxThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of+M is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-5: carry out i
s=i
MaxIf+M+1 is i
sGreater than the probe unit number of linear array photodetector 204, then change S004-8;
S004-6: if H is (i
s)>=S/N
Max, be i then with sequence number
sThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M ' is initialized as 0, otherwise: 1. find out and satisfy condition
And i
s+ m is no more than the maximum nonnegative integer m of the probe unit number of linear array photodetector 204, and its value is kept among the variable M '; 2. be i with sequence number
s, i
s+ 1 ..., i
sThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of+M ' is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-7: carry out i
s=i
sIf+M '+1 is i
sGreater than the probe unit number of linear array photodetector 204, then change S004-8; Otherwise change S004-6;
S004-8: carry out i
s=i
Max-1, if i
sLess than 1, then change Step005;
S004-9: if H is (i
s)>=S/N
Max, be i then with sequence number
sThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M ' is initialized as 0, otherwise: 1. find out and satisfy condition
And i
sThe maximum nonnegative integer m of-m>=1 is kept at its value among the variable M '; 2. be i with sequence number
s, i
s-1 ..., i
sThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of-M ' is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-10: carry out i
s=i
sIf-M '-1 is i
sLess than 1, then change Step005, otherwise change S004-9;
Step005: for each optical frequency chip that abovementioned steps is confirmed, press the order from the low frequency to the high frequency, if the output signal strength sum B002 of the probe unit of all linear array photodetectors 204 of an optical frequency chip B001 correspondence is less than S/ (2 * N
Max); Then: with an optical frequency chip B001 and an adjacent optical frequency chip of optical frequency chip merging becoming; Selecting the criterion of the adjacent optical frequency chip that institute will merge is that the output signal strength sum B003 of the probe unit of all linear array photodetectors 204 that adjacent optical frequency chip is corresponding is minimum, has only an adjacent optical frequency chip as if optical frequency chip B001; Then the unique adjacent optical frequency chip with it merges, and carries out N
1=N
1-1.
Through above-mentioned steps, the optical frequency number of chips N that can be optimized
1, and divide gamete optical frequency band for each optical frequency chip, thus the bandwidth Design of each optical frequency chip accomplished.
Because each pixel of linear array electrooptical liquid crystal spatial light modulator 104 and each probe unit of linear array photodetector 204 have one-to-one relationship; Therefore in the spectrum amplitude coded system; Can confirm the pixel sequence number of the linear array electrooptical liquid crystal spatial light modulator 104 that each optical frequency chip is corresponding according to the probe unit sequence number of the corresponding linear array photodetector 204 of each optical frequency chip; Coding control and driver module 109 are when the output encoder control signal; The pixel of all linear array electrooptical liquid crystal spatial light modulators 104 that each optical frequency chip is corresponding is used as an integral body, promptly exports identical coding control signal to the pixel of all corresponding linear array electrooptical liquid crystal spatial light modulators 104 of same optical frequency chip; In the decoding process module 205 of spectrum amplitude decode system, the output signal strength of the probe unit of all earlier that each optical frequency chip is corresponding linear array photodetectors 204 is accumulated in together, carries out decoding operation again.
In this execution mode; Wide spectrum light source 101 is selected the infrared LED light source for use, and spectrum grating 103 is selected for use with spectrum grating 105 and executed gram mirror reflection grating, and linear array electrooptical liquid crystal spatial light modulator 104 is selected linear array amplitude type electrooptical liquid crystal spatial light modulator for use; Coding control makes up based on the DSP digital signal processor with driver module 109; Optical receiver antenna 201 is selected Cassegrainian telescope for use, and spectrum spectral module 202 makes up based on executing gram mirror reflection grating, and linear array photodetector 204 is selected line array CCD for use; Decoding process module 205 makes up based on the DSP digital signal processor, and linear array photodetector data collecting card makes up based on FPGA.When practical implementation the inventive method, between convex lens 106 and optical receiver antenna 201, simulate long apart from the free space channel with parallel light tube; When carrying out optical frequency chip bandwidth optimization design, the wide spectrum light source 101 of use, spectrum grating 103, spectrum grating 105, linear array electrooptical liquid crystal spatial light modulator 104, spectrum spectral module 202, linear array photodetector 204 all are the employed devices of actual spectrum amplitude coding/decoding system.
Claims (1)
1. the optical frequency chip bandwidth optimization method for designing of spectrum amplitude coding/decoding system is characterized in that required system configuration and implementation method are following:
The optical frequency chip bandwidth optimization method for designing that the purpose of this invention is to provide a kind of spectrum amplitude coding/decoding system; The spectrum amplitude coded system is made up of with driver module 109 wide spectrum light source 101, convex lens 102, convex lens 110, spectrum grating 103, speculum 107, linear array electrooptical liquid crystal spatial light modulator 104, speculum 108, spectrum grating 105, convex lens 111, convex lens 106, coding control; Behind the light signal A001 process convex lens 102 and convex lens 110 conversion of wide spectrum light source 101 outputs; Incide on the spectrum grating 103; 103 couples of light signal A001 of spectrum grating carry out beam split, and the optical signal component of different frequency is spatially separated, and after speculum 107 reflections, incide on the linear array electrooptical liquid crystal spatial light modulator 104 again; Incide on the spectrum grating 105 after speculum 108 reflections from the light signal of linear array electrooptical liquid crystal spatial light modulator 104 transmissions; 105 pairs of each optical frequency signal components of spectrum grating are carried out the space and are merged, and the light signal after the merging after planoconvex lens 111 and convex lens 106 conversion, finally is transmitted in the free space channel again; Coding control links to each other with linear array electrooptical liquid crystal spatial light modulator 104 with driver module 109, can control the state of each pixel A 002 of linear array electrooptical liquid crystal spatial light modulator 104 through coding control and driver module 109; The spectrum amplitude decode system is made up of optical receiver antenna 201, spectrum spectral module 202, convex lens 203, linear array photodetector 204, decoding process module 205, linear array photodetector data collecting card and computer; The light signal that optical receiver antenna 201 receives carries out beam split through spectrum spectral module 202; Each optical frequency signal component of the light signal that optical receiver antenna 201 receives is spatially separated; Incide on the linear array photodetector 204 after each optical frequency signal component planoconvex lens 203 conversion that separates on the space, accomplish decoding work through decoding process module 205 at last; Each pixel A 002 of linear array electrooptical liquid crystal spatial light modulator 104 is equivalent to a switch; When a pixel A 002 is in " open-minded " state; The optical frequency signal component that incides on the pixel A 002 can see through; When a pixel A 002 was in " closure " state, the optical frequency signal component that incides on the pixel A 002 can not see through; Through being convex lens 102, convex lens 110, the suitable focal length parameter of convex lens 203 designs; The number by the probe unit that is covered by light signal of light signal covered pixels number and linear array photodetector 204 of linear array electrooptical liquid crystal spatial light modulator 104 is equated; Thereby make each pixel of linear array electrooptical liquid crystal spatial light modulator 104 and each probe unit of linear array photodetector 204 form relation one to one; Even linear array electrooptical liquid crystal spatial light modulator 104 pixel is set to " closure " state, and will cause the intensity of incident optical frequency signal component of the probe unit of corresponding with it linear array photodetector 204 is 0; Method of the present invention realizes through following steps:
Step001: all be installed in spectrum amplitude coded system and spectrum amplitude decode system on the optical table; On optical table, the convex lens 106 of spectrum amplitude coded system and the optical receiver antenna 201 of spectrum amplitude decode system are carried out optical axis alignment, the light signal of spectrum amplitude coded system emission can be got in the spectrum amplitude decode system;
Step002: make wide spectrum light source 101 emission light signals; Coding control is simultaneously all exported " open-minded " signal with driver module 109 to each pixel of linear array electrooptical liquid crystal spatial light modulator 104, and all optical frequency signal components that make speculum 107 reflections are all from linear array electrooptical liquid crystal spatial light modulator 104 transmissive;
Step003: receive and record by linear array photodetector data collecting card and computer detectable signal data to linear array photodetector 204; Thereby obtain the output signal strength A003 of each probe unit of linear array photodetector 204, the output signal strength A003 of each probe unit is left among the array H;
Step004: in computer, carry out following steps, so that confirm the optical frequency number of chips N of the optimization of spectrum amplitude coded system
1And the sub-optical frequency band got of each optical frequency chip:
S004-1: specify the maximum optical frequency number of chips N that allows
MaxSize, with N
1Be initialized as 0;
S004-2: the output signal strength sum S that calculates all probe units of linear array photodetector 204;
S004-3: find out the maximum sequence number i of elements A 005 in array H of array H intermediate value
Max, the value of elements A 005 can be written as H (i
Max);
S004-4: if H is (i
Max)>=S/N
Max, be i then with sequence number
MaxThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M is initialized as 0, otherwise: 1. find out and satisfy condition
And i
Max+ m is no more than the maximum nonnegative integer m of the probe unit number of linear array photodetector 204, and its value is kept among the variable M; 2. be i with sequence number
Max, i
Max+ 1 ..., i
MaxThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of+M is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-5: carry out i
s=i
MaxIf+M+1 is i
sGreater than the probe unit number of linear array photodetector 204, then change S004-8;
S004-6: if H is (i
s)>=S/N
Max, be i then with sequence number
sThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M ' is initialized as 0, otherwise: 1. find out and satisfy condition
And i
s+ m is no more than the maximum nonnegative integer m of the probe unit number of linear array photodetector 204, and its value is kept among the variable M '; 2. be i with sequence number
s, i
s1 ..., i
sThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of+M ' is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-7: carry out i
s=i
sIf+M '+1 is i
sGreater than the probe unit number of linear array photodetector 204, then change S004-8; Otherwise change S004-6;
S004-8: carry out i
s=i
Max-1, if i
sLess than 1, then change Step005;
S004-9: if H is (i
s)>=S/N
Max, be i then with sequence number
sThe corresponding sub-optical frequency band of incident optical frequency signal component of probe unit of linear array photodetector 204 distribute to an optical frequency chip, carry out N simultaneously
1=N
1+ 1 and variable M ' is initialized as 0, otherwise: 1. find out and satisfy condition
And i
sThe maximum nonnegative integer m of-m>=1 is kept at its value among the variable M '; 2. be i with sequence number
s, i
s-1 ..., i
sThe corresponding sub-optical frequency band of the incident optical frequency signal component of the probe unit of the linear array photodetector 204 of-M ' is distributed to an optical frequency chip, carries out N simultaneously
1=N
1+ 1;
S004-10: carry out i
s=i
sIf-M '-1 is i
sLess than 1, then change Step005, otherwise change S004-9;
Step005: for each optical frequency chip that abovementioned steps is confirmed, press the order from the low frequency to the high frequency, if the output signal strength sum B002 of the probe unit of all linear array photodetectors 204 of an optical frequency chip B001 correspondence is less than S/ (2 * N
Max); Then: with an optical frequency chip B001 and an adjacent optical frequency chip of optical frequency chip merging becoming; Selecting the criterion of the adjacent optical frequency chip that institute will merge is that the output signal strength sum B003 of the probe unit of all linear array photodetectors 204 that adjacent optical frequency chip is corresponding is minimum, has only an adjacent optical frequency chip as if optical frequency chip B001; Then the unique adjacent optical frequency chip with it merges, and carries out N
1=N
1-1;
Through above-mentioned steps, the optical frequency number of chips N that can be optimized
1, and divide gamete optical frequency band for each optical frequency chip, thus the bandwidth Design of each optical frequency chip accomplished;
Characteristic of the present invention also is; Because each pixel of linear array electrooptical liquid crystal spatial light modulator 104 and each probe unit of linear array photodetector 204 have one-to-one relationship; Therefore in the spectrum amplitude coded system; Can confirm the pixel sequence number of the linear array electrooptical liquid crystal spatial light modulator 104 that each optical frequency chip is corresponding according to the probe unit sequence number of the corresponding linear array photodetector 204 of each optical frequency chip; Coding control and driver module 109 are when the output encoder control signal; The pixel of all linear array electrooptical liquid crystal spatial light modulators 104 that each optical frequency chip is corresponding is used as an integral body, promptly exports identical coding control signal to the pixel of all corresponding linear array electrooptical liquid crystal spatial light modulators 104 of same optical frequency chip; In the decoding process module 205 of spectrum amplitude decode system, the output signal strength of the probe unit of all earlier that each optical frequency chip is corresponding linear array photodetectors 204 is accumulated in together, carries out decoding operation again.
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| CN201210214012.5A CN102723985B (en) | 2012-06-27 | 2012-06-27 | Bandwidth optimization and design method for optical frequency code chips of spectral amplitude encoding/decoding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243047B (en) * | 2014-09-19 | 2018-01-12 | 电子科技大学 | A kind of PDM DQPSK/SAC signal exchange systems |
| CN114257302A (en) * | 2021-12-07 | 2022-03-29 | 武汉邮电科学研究院有限公司 | Method and system for realizing wireless communication based on single ASE light source |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0564355A1 (en) * | 1992-04-02 | 1993-10-06 | France Telecom | Photoreceiver for frequency-modulated optical signals |
| CN1492250A (en) * | 2002-08-16 | 2004-04-28 | �ձ����ŵ绰��ʽ���� | Polarized wave mode chromatic dispersion compensation method and polarized wave mode chromatic dispersion conpensation device |
| CN102231646A (en) * | 2011-05-13 | 2011-11-02 | 电子科技大学 | Device and method for recognizing spectrum amplitude code mark through frequency sweeping coherent detection |
-
2012
- 2012-06-27 CN CN201210214012.5A patent/CN102723985B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0564355A1 (en) * | 1992-04-02 | 1993-10-06 | France Telecom | Photoreceiver for frequency-modulated optical signals |
| CN1492250A (en) * | 2002-08-16 | 2004-04-28 | �ձ����ŵ绰��ʽ���� | Polarized wave mode chromatic dispersion compensation method and polarized wave mode chromatic dispersion conpensation device |
| CN102231646A (en) * | 2011-05-13 | 2011-11-02 | 电子科技大学 | Device and method for recognizing spectrum amplitude code mark through frequency sweeping coherent detection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243047B (en) * | 2014-09-19 | 2018-01-12 | 电子科技大学 | A kind of PDM DQPSK/SAC signal exchange systems |
| CN114257302A (en) * | 2021-12-07 | 2022-03-29 | 武汉邮电科学研究院有限公司 | Method and system for realizing wireless communication based on single ASE light source |
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