CN101674147A - ASK-FSK converter and conversion method - Google Patents
ASK-FSK converter and conversion method Download PDFInfo
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- CN101674147A CN101674147A CN200810149579A CN200810149579A CN101674147A CN 101674147 A CN101674147 A CN 101674147A CN 200810149579 A CN200810149579 A CN 200810149579A CN 200810149579 A CN200810149579 A CN 200810149579A CN 101674147 A CN101674147 A CN 101674147A
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Abstract
The invention discloses an ASK-FSK converter and a conversion method, which relate to the field of optical communication and are invented for solving the problem that fast conversion of an ASK opticalsignal into an FSK optical signal cannot be realized in the prior art. The embodiment of the invention provides the ASK-FSK converter, which comprises a beam splitter, a light generator, a first optical coupler, a polarization modulator and a second optical coupler. Based on the ASK-FSK converter, the ASK optical signal can be split into two paths, wherein one path of the ASK optical signal interacts with continuous polarized light in the polarization modulator to change the polarization state of the polarized light to convert the polarized light into an optical signal which is logically opposite to the ASK optical signal has a frequency different from that of the ASK optical signal; and then the optical signal which is logically opposite to the ASK optical signal is coupled with the other path of the ASK optical signal to obtain the FSK optical signal. The converter and the method are suitable for fast conversion of the ASK optical signal into the FSK optical signal.
Description
Technical field
The present invention relates to optical communication field, relate in particular to a kind of ASK-FSK (amplitude shift key modulation sign indicating number type is to the frequency shift keying modulation format) transducer and conversion method.
Background technology
(Frequency-shift Keying, FSK) modulation format has been confirmed to be in the long haul optical transmission modulation format preferably to frequency shift keying at present.With phase shift keying (Phase-shift Keying, PSK), amplitude shift keying (Amplitude-shift Keying, ASK) etc. modulation format is compared, FSK shows the minimum sensitiveness to nonlinear fiber damage, and the FSK modulation format can be supported and the ASK modulation format between quadrature modulation.
In the quadrature ASK/FSK of signal technology tagging scheme, the payload information in the light packet switching network adopts the FSK modulation.If each terminal signaling is to adopt the ASK modulation, then in the fringe node router, need to carry out the code conversion of ASK to FSK, thereby in the light packet switching network with the form transmitted load information of FSK.
In the Hybrid Modulation Technology scheme of Technology of Light Access Network, if interface at metropolitan area network and local area network (LAN), the metropolitan area network signal is traditional ASK signal, and the signal in the Access Network is a fsk signal, then need carry out the sign indicating number type conversion of ASK to FSK at network edge equally.
Therefore the conversion of ASK and FSK modulation format mainly is the real-time conversion that realizes full light at the network intersection of using the different modulating form.
Fig. 1 has showed the arrangements and the operation of the ASK-FSK switch technology that generally adopts at present.Wherein,, utilize photoelectricity modulation and electrooptic modulation successively, make it be converted to fsk signal for the signal of ASK.
State in realization in the process of ASK-FSK conversion, the inventor finds that there are the following problems at least in the prior art:
Above-mentioned ASK-FSK conversion plan needs to convert the ASK light signal to the signal of telecommunication earlier, adopt the FSK modulation system that this electrical signal conversion is become the FSK light signal then, relate to the conversion of opto-electronic conversion and electric light, since the restriction of opto-electronic conversion response speed and electric light transition response speed, the therefore very difficult high-speed transitions that realizes ASK-FSK.
Summary of the invention
Embodiments of the invention provide a kind of ASK-FSK transducer and conversion method, can realize ASK-FSK sign indicating number type conversion at a high speed.
For achieving the above object, the ASK-FSK transducer that the embodiment of the invention provides comprises:
Beam splitter receives the ASK light signal, and described ASK light signal is beamed into the first via ASK light signal and the second road ASK light signal;
Optical generator produces the continuous polarised light different with described ASK optical signal frequency;
First optical coupler is connected to an output and the described optical generator of described beam splitter, and described first via ASK light signal and described continuous polarised light are coupled;
Light polarization modulator, be connected to described first optical coupler, when the polarization direction of first via ASK light signal becomes predetermined angular with the polarization direction of described continuous polarised light, utilize the cross polarization mudulation effect that described continuous polarised light is modulated into the light signal of described ASK light signal logical inversion and also export;
Second optical coupler is connected to another output of described light polarization modulator and described beam splitter, and the light signal and described the second road ASK light signal of described light polarization modulator output is coupled, and obtains the FSK light signal.
For achieving the above object, the ASK-FSK conversion method that the embodiment of the invention provides comprises:
The ASK light signal is beamed into the first via ASK light signal and the second road ASK light signal;
Generate the continuous polarised light different with described ASK optical signal frequency;
Described first via ASK light signal and described continuous polarised light are coupled;
When the polarization direction of first via ASK light signal becomes predetermined angular with the polarization direction of described continuous polarised light, utilize the cross polarization mudulation effect that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion;
Light signal and the coupling of described the second road ASK light signal with described and described ASK light signal logical inversion obtain the FSK light signal.
ASK-FSK transducer and conversion method that the embodiment of the invention provides, the ASK light signal is divided into two-way, will be different with described ASK optical signal frequency and the polarization direction continuous polarised light that becomes predetermined angular be input in the light polarization modulator together with one road ASK light signal wherein, utilize cross polarization mudulation effect wherein that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion, this moment should with the different and logical inversion of frequency between the light signal of described ASK light signal logical inversion and the former ASK light signal, the light signal and other one road ASK light signal of this and described ASK light signal logical inversion are coupled, can obtain a FSK light signal that all shows as logical one but comprise two different frequency signals simultaneously.Compared with prior art, ASK-FSK transducer and conversion method that the embodiment of the invention provides in the process of carrying out the ASK-FSK conversion, do not relate to the conversion of opto-electronic conversion and electric light, thereby can realize ASK-FSK conversion of signals at a high speed.
Description of drawings
Fig. 1 is the schematic diagram of ASK-FSK switch technology in the prior art;
Fig. 2 is the structural representation of ASK-FSK transducer among the embodiment one;
Fig. 3 is the structural representation of ASK-FSK transducer among the embodiment two;
Fig. 4 is the power of polarization beam apparatus among the embodiment two and the graph of a relation of RA1;
Fig. 5 is the graph of a relation of the error rate and RA2 among the embodiment two;
Fig. 6 is the oscillogram before and after the coupling of two-way ASK light signal among the embodiment two;
Fig. 7 is the structural representation of ASK-FSK transducer among the embodiment three;
Fig. 8 is the eye pattern of ASK light signal among the embodiment three;
Fig. 9 is the flow chart of ASK-FSK conversion method among the embodiment four;
Figure 10 is the flow chart of ASK-FSK conversion method among the embodiment five;
The principle schematic of Figure 11 in the embodiment of the invention ASK light signal being reversed.
Embodiment
In order to realize ASK-FSK sign indicating number type conversion at a high speed, the embodiment of the invention provides a kind of ASK-FSK transducer and conversion method.Below in conjunction with accompanying drawing ASK-FSK transducer and the conversion method that the embodiment of the invention provided is described in detail.
Embodiment one:
As shown in Figure 2, the ASK-FSK transducer that the embodiment of the invention provides comprises:
First optical coupler 13 is connected to the output and the described optical generator 12 of described beam splitter 11, and described first via ASK light signal and described continuous polarised light are coupled;
Second optical coupler 15 is connected to another output of described light polarization modulator 14 and described beam splitter 11, and the light signal and described the second road ASK light signal of described light polarization modulator output is coupled, and obtains the FSK light signal.
The ASK-FSK transducer that the embodiment of the invention provides, the ASK light signal can be divided into two-way, then will be different with described ASK optical signal frequency and the polarization direction continuous polarised light that becomes predetermined angular with the polarization direction of described ASK light signal be input in the light polarization modulator with one road ASK light signal wherein, utilize cross polarization mudulation effect wherein that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion, this moment should with the different and logical inversion of frequency between the light signal of described ASK light signal logical inversion and the former ASK light signal, the light signal and other one road ASK light signal of this and described ASK light signal logical inversion are coupled, can obtain a FSK light signal that all shows as logical one but comprise two different frequency signals simultaneously.
Embodiment two:
Shown in Figure 3, select for use high-order nonlinear optical fiber as cross polarization attitude modulated media, promptly with the combination of high-order nonlinear optical fiber and analyzer ASK-FSK transducer for what the embodiment of the invention provided, comprising: beam splitter Coupler1, laser diode LD 2, Polarization Controller PC1, Polarization Controller PC2, optical coupler Coupler2, high-order nonlinear optical fiber HNLF, polarization beam apparatus PBS and optical coupler Coupler3 as light polarization modulator; Wherein, the output of polarization beam apparatus PBS one end is to be used as analyzer.In addition, the ASK-FSK transducer that provides of present embodiment also comprises optical time delay device ODL.
As shown in Figure 3, in the present embodiment, adopt another laser diode LD 1 to produce the high speed ASK light signal of 40Gbit/s, this LD1 operation wavelength is that 1554.4nm, input power are 20dBm; Be two ways of optical signals: ASK1 and ASK2 by Coupler1 with its beam splitting with described high speed ASK light signal then; The LD2 operation wavelength is that 1553.2nm, input power are 7dBm, produces and the different continuous light of described ASK optical signal frequency; By PC2, described continuous light is adjusted into the polarization direction continuous polarised light consistent with the polarization principal axis direction of analyzer PBS; Then, by PC1 the polarization direction of described ASK1 is adjusted into the polarization direction of described continuous polarised light and becomes predetermined angular, this predetermined angular greater than 0 ° less than 90 °, can set this predetermined angular in the present embodiment is 45 °; Afterwards, utilize Coupler2 that described ASK1 and described continuous polarised light are coupled again, and be injected among the HNLF.
The HNLF length that is adopted in the present embodiment is 500m, and non linear coefficient is γ=10.6W
-1Km
-1, reduce to about 12 μ m owing to mix the cause effective area of germanium fibre core
2Its zero-dispersion wavelength is that 1553.6nm and chromatic dispersion gradient are 0.022psnm
-2Km
-1Because the high-order nonlinear characteristic (Kerr effect) of HNLF makes refraction index changing in the optical fiber, the ASK1 that enters wherein makes the polarization direction of described continuous polarised light rotate according to the polarization state of the different generation different angles of the amplitude of ASK1 with polarised light effect continuously.
Through analyzer PBS, have only wherein the polarization direction light signal consistent to export by the light signal of HNLE output with this PBS polarization principal axis direction.At this moment, the light signal by PBS output is a light signal different with former ASK optical signal frequency and logical inversion.
For other one road ASK light signal ASK2, ODL delays time to it by the optical time delay device, is adjusted to the light signal maintenance of described PBS output described ASK2 synchronous; Then, the light signal of PBS output and the ASK2 after the described time-delay are coupled, can obtain the FSK light signal by Coupler3.
In the present embodiment, selected for use the output of polarization beam apparatus PBS one end to be used as analyzer, can also adjust the anglec of rotation (RA1) of PC2 like this, made the polarization direction of described continuous light consistent with the polarization principal axis of PBS by the variable power of monitoring PBS.As shown in Figure 4, PBS1 and PBS2 represent quadrature component and the longitudinal axis component of PBS respectively, along with occurring variable power alternately between the change PBS1 of RA1 and the PBS2.Clearly, when RA1 was near 0 °, the power of PBS1 reached minimum value, and the power of PBS2 then reaches maximum, and can think that the polarization direction of described continuous polarised light is consistent with the y direction of PBS this moment; When RA1 is near ± 180 °, then be that the power of PBS2 reaches minimum value, the power of PBS1 then reaches maximum, and can think that the polarization direction of described continuous polarised light is consistent with the X direction of PBS this moment.
In the ASK-FSK transducer that present embodiment provides, can also between HNLF and PBS, add a polarizer; Under the certain situation of PBS power, can adjust the error rate that the ASK light signal is transformed into the FSK light signal by the anglec of rotation (RA2) that changes this polarizer.As shown in Figure 5, when RA2 was near 70 °, the error rate reached minimum value.
The ASK-FSK transducer that the embodiment of the invention provides, the ASK light signal can be divided into two-way: ASK1 and ASK2, then will be different with described ASK optical signal frequency and the polarization direction become the continuous polarised light of predetermined angular to be input in the high-order nonlinear optical fiber with the polarization direction of described ASK light signal with ASK1, utilize cross polarization mudulation effect wherein to make described continuous polarised light, obtain light signal different with described ASK optical signal frequency and logical inversion by analyzer more afterwards according to the different polarization state rotations that produce different angles of the amplitude of ASK1; The light signal of this and described ASK light signal logical inversion is coupled with the ASK2 that has carried out time-delay, can obtains a FSK light signal that all shows as logical one but comprise two different frequency signals simultaneously.As can be seen from Figure 6, ASK1 forms strict reverse signal with the polarised light effect is that produce continuously with the output waveform of light signal ASK1 ' described ASK light signal logical inversion and the output wave of ASK2, obtains the pulse signal of a string logic for " 1 " after it is coupled; But because the difference of initial data, the actual light signal that carries two frequency differences and logical inversion of this pulse signal.
Embodiment three:
Shown in Figure 7, select for use semiconductor optical amplifier as cross polarization attitude modulated media, promptly with the combination of semiconductor optical amplifier and analyzer ASK-FSK transducer for what the embodiment of the invention provided, comprising: beam splitter Coupler1, outside cavity gas laser ECL2, Polarization Controller PC1, Polarization Controller PC2, optical coupler Coupler2, semiconductor optical amplifier SOA, polarization beam apparatus PBS and optical coupler Coupler3 as light polarization modulator; Wherein, the output of polarization beam apparatus PBS one end is to be used as analyzer.In addition, the ASK-FSK transducer that provides of present embodiment also comprises optical time delay device ODL.
As shown in Figure 7, in the present embodiment, adopt another outside cavity gas laser ECL1 to produce the high speed ASK light signal of 40Gbit/s, this ECL1 operation wavelength is 1557.9nm; Be two ways of optical signals: ASK1 and ASK2 by Coupler1 with its beam splitting with described high speed ASK light signal then; The ECL2 operation wavelength is 1559.1nm, produces and the different continuous light of described ASK optical signal frequency; By PC2, described continuous light is adjusted into the polarization direction continuous polarised light consistent with the polarization principal axis direction of analyzer PBS; Then, by PC1 the polarization direction of described ASK1 is adjusted into the polarization direction of described continuous polarised light and becomes predetermined angular, this predetermined angular greater than 0 ° less than 90 °, can set this predetermined angular in the present embodiment is 45 °; Afterwards, utilize Coupler2 that described ASK1 and described continuous polarised light are coupled again, and be injected among the SOA.
Because among the SOA, input signal light can consume charge carrier, and carrier concentration is changed, and then refractive index is changed; Change of refractive makes the continuous polarization polarization state of light by SOA change with the change of ASK1 amplitude.
Through analyzer PBS, have only wherein the polarization direction light signal consistent to export by the light signal of SOA output with this PBS polarization principal axis direction.At this moment, the light signal by PBS output is a light signal different with former ASK optical signal frequency and logical inversion.
As shown in Figure 8, be the eye pattern of ASK light signal; Wherein the top is that RZ-ASK primary signal, below are the reverse signal by the RZ-ASK of SOA.Clearly, the contrast of two waveforms can see that the RZ-ASK light signal has strictly been realized counter-rotating about among Fig. 8; And we can also see from here, and the RZ signal also has tolerance limit preferably to the such nonlinear effect of cross polarization attitude modulation.
For other one road ASK light signal ASK2, ODL delays time to it by the optical time delay device, is adjusted to the light signal maintenance of described PBS output described ASK2 synchronous; Then, the light signal of PBS output and the ASK2 after the described time-delay are coupled, can obtain the FSK light signal by Coupler3.
In the present embodiment, selected for use the output of polarization beam apparatus PBS one end to be used as analyzer equally, can also adjust the anglec of rotation of PC2 like this, made the polarization direction of described continuous light consistent with the polarization principal axis of PBS by the variable power of monitoring PBS.
The ASK-FSK transducer that the embodiment of the invention provides, the ASK light signal can be divided into two-way: ASK1 and ASK2, then will be different with described ASK optical signal frequency and the polarization direction become the continuous polarised light of predetermined angular to be input in the semiconductor optical amplifier with the polarization direction of described ASK light signal with ASK1, utilize cross polarization mudulation effect wherein to make described continuous polarised light, obtain light signal different with described ASK optical signal frequency and logical inversion by analyzer more afterwards according to the different polarization state rotations that produce different angles of the amplitude of ASK1; The light signal of this and described ASK light signal logical inversion is coupled with the ASK2 that has carried out time-delay, can obtains a FSK light signal that all shows as logical one but comprise two different frequency signals simultaneously.
Embodiment four:
As shown in Figure 9, the ASK-FSK conversion method that the embodiment of the invention provides may further comprise the steps:
91, the ASK light signal is beamed into the first via ASK light signal and the second road ASK light signal.
92, the generation continuous polarised light different with described ASK optical signal frequency.
93, described first via ASK light signal and described continuous polarised light are coupled.
When 94, becoming predetermined angular with the polarization direction of described continuous polarised light, utilize the cross polarization mudulation effect that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion in the polarization direction of first via ASK light signal.
95, with the light signal and the coupling of described the second road ASK light signal of described and described ASK light signal logical inversion, obtain the FSK light signal.
The ASK-FSK conversion method that present embodiment provides, the ASK light signal is divided into two-way, then will be different with described ASK optical signal frequency and the polarization direction continuous polarised light that becomes predetermined angular with the polarization direction of described ASK light signal be input in the light polarization modulator with one road ASK light signal wherein, utilize cross polarization mudulation effect wherein that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion, this moment should with the different and logical inversion of frequency between the light signal of described ASK light signal logical inversion and the former ASK light signal, the light signal and other one road ASK light signal of this and described ASK light signal logical inversion are coupled, can obtain a FSK light signal that all shows as logical one but comprise two different frequency signals simultaneously.
Embodiment five:
As shown in figure 10, the ASK-FSK conversion method that the embodiment of the invention provides may further comprise the steps:
101, the ASK light signal is beamed into two-way: ASK1 and ASK2.
102, generation and the different continuous light of described ASK optical signal frequency.
103, described continuous light is adjusted into the polarization direction continuous polarised light consistent with the polarization principal axis direction of analyzer.
104, the polarization direction of described ASK1 be adjusted into the polarization direction of described continuous polarised light become predetermined angular, this predetermined angular greater than 0 ° less than 90 °, preferably setting this predetermined angular in the present embodiment is 45 °.
105, described ASK1 and described continuous polarised light are coupled.
106, utilize the cross polarization mudulation effect to adjust the polarization direction of described continuous polarised light according to the amplitude of described ASK1.
Wherein, as shown in figure 11, when described ASK1 is 1, described continuous polarised light is influenced by described ASK1, produce nonlinear cross polarization attitude modulation, the component that is parallel to described ASK1 polarization direction in the described continuous polarised light produces 180 ° nonlinear polarization attitude rotation, correspondingly, 90 ° of deflections take place in the polarization direction of polarised light continuously, and the polarization direction of Ci Shi continuous polarised light is vertical with the polarization principal axis direction of analyzer so;
When described ASK1 was 0, the polarization direction of described continuous polarised light did not change.
107, polarization direction in the continuous polarised light is consistent with analyzer polarization principal axis direction light signal is exported.
Wherein, the polarised light that the polarization direction does not change can pass through analyzer smoothly, shows as 1; Therefore and the polarised light that the polarization direction changes because that its polarization direction has become is vertical with the polarization principal axis direction of analyzer, can't pass through analyzer, shows as 0.At this moment, can obviously find out, by the light signal of analyzer output be strictly with described ASK light signal logical inversion, but their frequency is inequality.
108, the light signal that will export from analyzer and described ASK2 coupling obtains the FSK light signal.
The ASK-FSK conversion method that present embodiment provides, the ASK light signal is divided into two-way: ASK1 and ASK2, then will be different with described ASK optical signal frequency and the polarization direction become the continuous polarised light of predetermined angular to be input in the light polarization modulator with the polarization direction of described ASK light signal with ASK1, utilize cross polarization mudulation effect wherein that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion, this moment should with the different and logical inversion of frequency between the light signal of described ASK light signal logical inversion and the former ASK light signal, the light signal and the ASK2 of this and described ASK light signal logical inversion are coupled, can obtain a FSK light signal that all shows as logical one but comprise two different frequency signals simultaneously.
ASK-FSK transducer and conversion method that the embodiment of the invention provides not only can be used for the transfer process of RZ-ASK light signal to the RZ-FSK light signal, and can be used for the transfer process of NRZ-ASK light signal to the NRZ-FSK light signal.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (13)
1, a kind of ASK-FSK transducer is characterized in that, comprising:
Beam splitter receives the ASK light signal, and described ASK light signal is beamed into the first via ASK light signal and the second road ASK light signal;
Optical generator produces the continuous polarised light different with described ASK optical signal frequency;
First optical coupler is connected to an output and the described optical generator of described beam splitter, and described first via ASK light signal and described continuous polarised light are coupled;
Light polarization modulator, be connected to described first optical coupler, when the polarization direction of first via ASK light signal becomes predetermined angular with the polarization direction of described continuous polarised light, utilize the cross polarization mudulation effect that described continuous polarised light is modulated into the light signal of described ASK light signal logical inversion and also export;
Second optical coupler is connected to another output of described light polarization modulator and described beam splitter, and the light signal and described the second road ASK light signal of described light polarization modulator output is coupled, and obtains the FSK light signal.
2, ASK-FSK transducer according to claim 1 is characterized in that, described light polarization modulator comprises:
Cross polarization attitude modulated media is connected to described first optical coupler, utilizes the cross polarization mudulation effect to adjust the polarization direction of described continuous polarised light according to the amplitude of described first via ASK light signal;
Analyzer is connected to the output of described cross polarization attitude modulated media, is used for the light signal output that continuous polarised light polarization direction is consistent with this analyzer polarization principal axis direction, obtains the light signal with described ASK light signal logical inversion.
3, ASK-FSK transducer according to claim 2 is characterized in that, also is provided with polarizer between described cross polarization attitude modulated media and the described analyzer.
According to claim 2 or 3 described ASK-FSK transducers, it is characterized in that 4, described cross polarization attitude modulated media is high-order nonlinear optical fiber or semiconductor optical amplifier.
5, ASK-FSK transducer according to claim 1 and 2 is characterized in that, described optical generator comprises:
Laser generator produces and the different continuous light of described ASK optical signal frequency;
Polarization Controller is connected to described laser generator, and described continuous light is adjusted into the polarization direction continuous polarised light consistent with the polarization principal axis direction of described analyzer.
6, ASK-FSK transducer according to claim 1 is characterized in that, described ASK-FSK transducer also comprises:
Polarization Controller is connected between the output and first optical coupler of described beam splitter, the polarization direction of described first via ASK light signal is adjusted into the polarization direction of described continuous polarised light become predetermined angular.
7, according to claim 1 or 6 described ASK-FSK transducers, it is characterized in that described predetermined angular is 45 °.
8, ASK-FSK transducer according to claim 1 is characterized in that, described ASK-FSK transducer also comprises:
The optical time delay device is connected between another output and described second optical coupler of described beam splitter, is adjusted to the light signal maintenance of described light polarization modulator output described the second road ASK light signal synchronous.
9, a kind of ASK-FSK conversion method is characterized in that, comprising:
The ASK light signal is beamed into the first via ASK light signal and the second road ASK light signal;
Generate the continuous polarised light different with described ASK optical signal frequency;
Described first via ASK light signal and described continuous polarised light are coupled;
When the polarization direction of first via ASK light signal becomes predetermined angular with the polarization direction of described continuous polarised light, utilize the cross polarization mudulation effect that described continuous polarised light is modulated into light signal with described ASK light signal logical inversion;
Light signal and the coupling of described the second road ASK light signal with described and described ASK light signal logical inversion obtain the FSK light signal.
10, ASK-FSK conversion method according to claim 9 is characterized in that, before described first via ASK light signal and described continuous polarised light are coupled, also comprises:
The polarization direction of described first via ASK light signal is adjusted into the polarization direction of described continuous polarised light becomes predetermined angular.
11, ASK-FSK conversion method according to claim 9 is characterized in that, the described cross polarization mudulation effect of utilizing specifically comprises the step that described continuous polarised light is modulated into the light signal of described ASK light signal logical inversion:
Utilize the cross polarization mudulation effect to adjust the polarization direction of described continuous polarised light according to the amplitude of described first via ASK light signal;
The light signal output that polarization direction in the continuous polarised light is consistent with analyzer polarization principal axis direction.
12, ASK-FSK conversion method according to claim 11 is characterized in that, the described cross polarization mudulation effect of utilizing is adjusted the process of the polarization direction of described continuous polarised light according to the amplitude of described first via ASK light signal, comprising:
When described first via ASK light signal was 1, described continuous polarised light was influenced by described first via ASK light signal, produced nonlinear cross polarization attitude modulation, and the polarization direction of described continuous polarised light deflects;
When described first via ASK light signal was 0, the polarization direction of described continuous polarised light did not change.
13, ASK-FSK conversion method according to claim 9 is characterized in that, the process of the continuous polarised light that described generation is different with described ASK optical signal frequency comprises:
Generate and the different continuous light of described ASK optical signal frequency;
Described continuous light is adjusted into the polarization direction continuous polarised light consistent with the polarization principal axis direction of analyzer.
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| CN102722039A (en) * | 2011-03-31 | 2012-10-10 | 诺基亚西门子通信公司 | Photomodulator |
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| JP3071118B2 (en) * | 1995-02-09 | 2000-07-31 | 日本原子力研究所 | Method for producing NiAl intermetallic compound to which fine additive element is added |
| EP1492291A1 (en) * | 2002-03-15 | 2004-12-29 | Seiko Epson Corporation | System and method of converting signals with phase-shift-keying (psk) modulation into signals with amplitude-shift-keying (ask) modulation |
| ATE347196T1 (en) * | 2004-07-13 | 2006-12-15 | Cit Alcatel | BAND LIMITED FSK MODULATION PROCESS |
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| CN103828317A (en) * | 2011-09-30 | 2014-05-28 | 英特尔公司 | Methods and arrangements for frequency shift communications |
| CN105393168A (en) * | 2014-04-24 | 2016-03-09 | 华为技术有限公司 | Nonlinear-effect-based pattern conversion method and pattern converter |
| CN105393168B (en) * | 2014-04-24 | 2018-07-31 | 华为技术有限公司 | A kind of code conversion method and code pattern converter based on nonlinear effect |
| CN104035070A (en) * | 2014-05-28 | 2014-09-10 | 南京复实通讯科技有限公司 | Visible light positioning system and method |
| CN107017953A (en) * | 2017-03-16 | 2017-08-04 | 华中科技大学 | A kind of fsk signal generation device, method and its application |
| CN107017953B (en) * | 2017-03-16 | 2019-10-25 | 华中科技大学 | A kind of fsk signal generation device, method and its application |
| CN109586800A (en) * | 2019-01-16 | 2019-04-05 | 电子科技大学 | A kind of full optical modulation formats conversion equipment |
| CN109586800B (en) * | 2019-01-16 | 2021-07-13 | 电子科技大学 | All-optical modulation format conversion device |
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