CN101406018A - M-system phase shift keying modulation method and system - Google Patents
M-system phase shift keying modulation method and system Download PDFInfo
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- CN101406018A CN101406018A CNA2007800000620A CN200780000062A CN101406018A CN 101406018 A CN101406018 A CN 101406018A CN A2007800000620 A CNA2007800000620 A CN A2007800000620A CN 200780000062 A CN200780000062 A CN 200780000062A CN 101406018 A CN101406018 A CN 101406018A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2096—Arrangements for directly or externally modulating an optical carrier
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
System and method for m-ary phase shifting keying modulation. According to an embodiment, the present invention provides a method for performing m-ary phase-keying shift modulation. The method includes providing at least a first signal and a second signal by a signal source. The first signal and the second signal are characterized by a first signal strength level. The method also includes attenuating the second signal to provide a third signal. The second signal are characterized by a second signal strength level which is at approximate 50% of the first signal strength level. The method additionally includes coupling the first signal to a first bias voltage to provide a fourth signal. Furthermore, the method includes coupling the third signal to a second bias voltage to provide a fifth signal. The method also includes a step for providing a sixth signal by combing the fourth signal and the fifth signal.
Description
Technical field
The present invention relates to communication network technology, particularly multi-system phase shift keying (PSK) modulation.
Background technology
The present invention relates to communication network technology, more particularly, specific embodiments of the invention relate to multi-system PSK modulation.For example, a plurality of embodiment of the present invention modulates the data of transmitting on optical communication network.In a specific embodiment, the invention provides quaternary phase shift keying (QPSK) modulation scheme in the optical-fiber network.It is pointed out that technology provided by the invention is with a wide range of applications.For example, embodiments of the invention can be used for the PSK modulation (such as DQPSK etc.) of binary phase shift keying (BPSK) modulation, high-order (such as 8 rank or high-order more) PSK modulation, difference PSK modulation and other type.
The PSK modulation is a kind of modulation technique that is widely adopted in the various communication networks.Particularly, the PSK modulator approach is particularly useful concerning optical-fiber network.Because the PSK modulation has a narrow bandwidth,, can save cost simultaneously so adopt this transmission means can improve efficiency of transmission.In addition, PSK modulation can be applicable to optical-fiber network be to a great extent because it to non-linear in the optical communication network have preferably tolerance (such as, caused non-linear by the physical property of optical medium).
In a PSK modulation scheme, use a limited number of phase place.Each phase place is assigned with a unique pattern of binary bits.For example, in binary phase shift keying (BPSK) modulation scheme, use phase distance from two phase places as π, these two phase places are represented " 0 " and " 1 " respectively.Another example is, in quaternary phase shift keying (QPSK) modulation scheme, uses phase distance from four phase places as pi/2, and these four phase places are represented " 00 " respectively, " 01 ", " 10 " and " 11 ".In the PSK modulation scheme of high-order more, use more closely-spaced more leggy to represent more multi-mode.
Because the more number of phases means each independent phase place usually and can be used for representing more bits, so people wish that usually the PSK modulation scheme has the phase of greater number.For example, in the BPSK modulation scheme, each phase place is represented 1 bit.And in the QPSK modulation scheme, each phase place is represented 2 bits, or the like.If other condition is identical, use QPSK to replace BPSK can improve message transmission rate greatly, can make the transmission rate multiplication.
Up to now, in the prior art, there is QPSK modulation scheme in the multiple relevant optical-fiber network.For example, a kind of smooth QPSK system has been developed in Alcatel-Lucent of the U.S..Fig. 1 is the structural representation of light QPSK system in the prior art.
As shown in Figure 1, this light QPSK system 100 comprises following parts:
1. light source 101;
2. signal source 102,104 and 106;
3. phaseshift modulator 103;
4. voltage source 105 and 107;
5. Mach-Zehnder (Mach-Zehnder) modulator 108; With
6. output 109.
In practical operation, light source 101 produces light signal (such as laser signal) and this light signal is sent to phaseshift modulator 103.The data-signal that phaseshift modulator 103 uses signal source 102 to produce is modulated the light signal that receives.After phaseshift modulator 103 modulation, light signal comprises by two possible phase places: 0 and the represented information of pi/2.Phaseshift modulator 103 sends to MZM 108 to the light signal after modulating.MZM 108 in the existing system generally is a kind of both arms MZM equipment.Except receiving the light signal after the modulation, MZM 108 also receives other 4 tunnel inputs: two opposite each other data-signals and two-way voltage.MZM 108 uses these two opposite data-signals that the signal through ovennodulation is carried out the phase modulated second time.These two voltages are biased in the voltage during with modulator 108 transfer curve minimum points usually, thereby allow 108 pairs of data-signals through ovennodulation of modulator to modulate.As an example, the picture group that system's 100 operations obtain has been shown among Fig. 2.
As shown in Figure 3, system 300 comprises following parts:
A) non-return-to-zero (NRZ) signal generator 301;
B) amplifier 302,303,306,307,308 and 309;
C) splitter 304 and 305;
D) time delay part 310;
E) voltage source 312 and 313;
F) modulator 315;
G) light source 311; With
H) output 316.
NRZ generator 301 provides two opposite each other NRZ data- signals.Amplifier 302 and 303 amplifies this two-way NRZ data-signal respectively.Usually amplifier 302 and 303 is independently and has different gain coefficients.Splitter 304 and 305 will be divided into two paths of signals respectively through the NRZ of processing and amplifying data-signal.Amplifier amplifies every road signal once more independently.In 310 pairs of two paths of signals that are divided into of time delay part a road carry out delay process.With 4 road signals, promptly two time delayed signals and two non-time delayed signals send to modulator 315.Except above-mentioned signal, modulator 315 also receives the bias voltage input.Modulator 315 uses above-mentioned 4 road signals and bias voltage to generate qpsk modulation signal.
According to different application, modulator 312 is operated under the different patterns.For example, Fig. 4 is the structural representation of a MZM modulator in the prior art.For example modulator 400 is used for system 300.Modulator 400 has the input of 4 road signals, and in the modulation of 1/2nd phase level, modulator 400 uses two paths of signals wherein to carry out phase modulated, and in the modulation of 1/4th phase level, modulator 400 uses other two paths of signals to carry out phase modulated.Compare with system 100, system 300 has plurality of advantages.Wherein, system 300 provides the possibility of multiple external control.
Above-mentioned method and system of the prior art can have multiple application, but because a variety of causes, said system and method have a lot of shortcomings, and this will be described in further detail below.
Therefore, need a kind of improved system and method that is used for M system PSK modulation.
Summary of the invention
The present invention relates to communication network technology, more particularly, specific embodiments of the invention relate to M system PSK modulation.For example, each embodiment of the present invention is to modulating at the optical communication network transmitting data.In the specific embodiment, provided the QPSK modulation scheme in the optical-fiber network.But the technical scheme that the embodiment of the invention provides is with a wide range of applications.For example, embodiments of the invention can be used for the PSK modulation (such as DQPSK etc.) of BPSK modulation, high-order (such as 8 or higher) PSK modulation, difference PSK modulation and other type.
The embodiment of the invention provides a kind of method that is used to carry out M system PSK modulation.This method comprises: first signal and secondary signal are provided, described first signal and secondary signal be characterized as first signal amplitude level.This method comprises that also described secondary signal is carried out attenuation operations generates the 3rd signal, the secondary signal amplitude that the is characterized as degree level of described the 3rd signal, and described secondary signal amplification level is near 50% of described first signal amplitude level.This method comprises that also coupling first bias voltage and first signal generate the 4th signal; Be coupled second bias voltage and the 3rd signal generates the 5th signal; Synthetic described the 4th signal and the 5th signal generate the 6th signal.This method also comprises provides light.In addition, this method comprises by the light that this light source provided is carried out the step that amplitude modulation(PAM) provides multistage modulated light signal.This amplitude modulation(PAM) comprises the operation of the 6th signal being carried out amplitude modulation(PAM) at least.And this method comprises the step of using image intensifer this amplitude modulation(PAM) light signal to be carried out the PSK modulation.This nonlinear optical amplifier be characterized as magnitude-phase characteristics.
The embodiment of the invention provides a kind of system that is used to carry out M system PSK modulation.This system comprises the signal source that is used to produce first signal and secondary signal.This first signal and secondary signal be characterized as first signal amplitude level.This system comprises in addition and is used for described secondary signal is carried out the signal attenuator that attenuation operations generates the 3rd signal, the 3rd signal be characterized as the secondary signal amplification level.For example, this secondary signal amplification level is near 50% of this first signal amplitude level.This system comprises that also be used to be coupled described first signal and first bias voltage generate the 4th signal, and be coupled described the 3rd signal and second bias voltage generate the 5th voltage of signals adjustment component.In addition, this system comprises and is used for synthetic described the 4th signal and the 5th signal generates the 6th voltage of signals compound component.This system comprises the light source that is used to provide light in addition.In addition, this system comprises and is used for generating the modulating part of modulated light signal by this light being carried out amplitude modulation(PAM).For example, this modulation at least with the 6th signal correction.This system also comprises image intensifer, is used for this modulated light signal is carried out PSK modulation and output M system PSK modulated light signal, the image intensifer that is characterized as known magnitude-phase characteristics of this image intensifer.
According to another embodiment, the invention provides a kind of system that is used to carry out M system PSK modulation.This system comprises the signal source that is used to generate at least the first signal and secondary signal.This first signal and secondary signal be characterized as first signal amplitude level.This system also comprises and is used for described secondary signal is carried out the signal attenuator that attenuation operations generates the 3rd signal, the 3rd signal be characterized as the secondary signal amplification level.For example, the amplitude of this secondary signal is near 50% of the amplitude of this first signal.This system comprises that in addition be used to be coupled described first signal and first bias voltage generate the 4th signal, and be coupled second bias voltage and the 3rd signal generate the 5th voltage of signals adjustment component.In addition, this system comprises and is used for synthetic described the 4th signal and the 5th signal generates the 6th voltage of signals compound component.In addition, this system comprises and being used on amplification level described the 6th signal being carried out the amplifying signal amplifier.This system also comprises the light source that is used to provide light.In addition, this system comprises and is used for described light is carried out the modulating part that amplitude modulation(PAM) generates modulated light signal, this modulation at least with the 6th signal correction.And this system comprises the optical attenuator that is used for described modulated light signal is carried out attenuation processing.This system also comprises and is used for described modulated light signal is carried out the phase shift keying modulation, and the image intensifer of output M system phase shift keying modulated light signal.
Compare with traditional technology, each embodiment of the present invention has various advantages.Wherein, compare with traditional system, each embodiment of the present invention uses less parts, thereby has reduced cost and complexity that system realizes.For example, compare with traditional system, the system that realizes according to embodiments of the invention uses fewer purpose modulator.The present invention also provides the embodiment flexibly that realizes high-order PSK modulation in the same way.In addition, embodiments of the invention and legacy system and method compatibility.
In different embodiment, can obtain above one or more beneficial effects.With reference to following detailed and accompanying drawing, can fully understand these beneficial effects of the present invention and various additional target, feature and advantage.
Description of drawings
For a more complete understanding of the present invention and advantage, can be with reference to below in conjunction with the description of the drawings, the same tag in the accompanying drawing is represented identical part:
Fig. 1 is the structural representation of light QPSK system in the prior art;
Fig. 2 shows system's 100 operations and obtains a picture group;
Fig. 3 is the structural representation of the QPSK modulating device that is used in the prior art data of optical-fiber network are modulated;
Fig. 4 is the structural representation of a MZM modulator in the prior art;
Fig. 5 is the structural representation of the system that is used for optical-fiber network PSK modulation of the embodiment of the invention;
Fig. 6 is the reduced graph of the voltage regulator part that uses in the embodiment of the invention;
Fig. 7 A is the schematic diagram of the signal of exporting in each stage of signal processing in electrical domain of the embodiment of the invention;
Fig. 7 B and 7C are the figure of the waveform that produces in optical arena of the embodiment of the invention;
Fig. 8 is the reduced graph of an image intensifer of the embodiment of the invention;
Fig. 9 is a phase modulated picture group of the embodiment of the invention;
Figure 10 is the reduced graph of the signal after the PSK modulation of the image intensifer output of the embodiment of the invention;
Figure 11 is the reduced graph of the signal after the PSK modulation of the image intensifer output of the embodiment of the invention.
Embodiment
For those skilled in the art can be understood and applied the invention, below the present invention is described in detail.Except the embodiment that the following specifically describes, General Principle described here can be used for being included in all embodiment and the application within spirit of the present invention and the protection range.Protection scope of the present invention is not limited only to described embodiment, but comprises that all meet the wideest protection range of principle of the present invention and feature.
The present invention relates to communication network technology, more particularly, specific embodiments of the invention relate to multi-system PSK modulation.For example, a plurality of embodiment of the present invention modulates the data of transmitting on optical communication network.In a specific embodiment, the invention provides quaternary phase shift keying (QPSK) modulation scheme in the optical-fiber network.It is pointed out that technology provided by the invention is with a wide range of applications.For example, embodiments of the invention can be used for the PSK modulation (such as DQPSK etc.) of binary phase shift keying (BPSK) modulation, high-order (such as 8 rank or high-order more) PSK modulation, difference PSK modulation and other type.
As mentioned above, there are a lot of shortcomings in PSK modulating system of the prior art.For example, just there is certain shortcoming in the system shown in Fig. 1 100.Wherein, use two MZM 108 that drive to make the realization of system 100 become expensive and be difficult to implement.Usually the parts of system 100 need high data precision, so the cost of parts is higher in the system.Signal will be through twice modulation in addition, thereby need the psk signal of modulation be amplified and Synchronous Processing.
In the prior art, self also there is shortcoming in system 300.The modulator that system 300 uses costs an arm and a leg and complex structure.In addition, because this modulator uses a plurality of MZM devices, guarantee the synchronous of these MZM devices, system 300 implements with regard to relative complex.And, since the output signal strength of modulator 315 a little less than, need amplify these signals usually.
Therefore embodiments of the invention provide economical, efficiently and flexibly have been used for the system and method for M system PSK modulation.
Fig. 5 is the structural representation of the system that is used for optical-fiber network PSK modulation of the embodiment of the invention.This figure only is one embodiment of the present of invention, should not limit the protection range of claim of the present invention.Those of ordinary skills should approve other various variations, modification and replacement.As an example, specific embodiment can be used to the QPSK modulation as shown in Figure 5.And, by this specific embodiment is made amendment, can use following technology to realize the more PSK modulation of high-order.
As shown in Figure 5, modulating system 500 comprises following parts:
1. signal source 501;
2. signal attenuator 502;
3. voltage regulator part 503;
4. the voltage compound component 505;
5. light source 506;
6. signal amplifier 507;
7.MZM?508；
8. voltage source 509;
9. optical attenuator 510;
10. image intensifer 511;
11. voltage source 512; With
12. output 513.
In actual applications, signal source 501 produces two paths of data signal D1 and D2.In a specific embodiment, this two paths of data signal has identical amplitude.According to concrete application, signal source 501 can use different modulator approaches to produce a lot of signals.As shown in the figure, in the QPSK modulation scheme, signal source 501 has generated the different data-signal of two-way.As an example, in the 8-PSK modulator approach, provide three tunnel different signals, or the like.In a plurality of embodiment of the present invention, introduced the modulation of M system, as 16-PSK, 32-PSK or the like.
Perhaps, signal source 501 can be used to produce differential phase shift keying (DPSK) signal.In the desired DPSK modulation scheme of the embodiment of the invention, produce and provide signal continuously, and represent different pieces of information by the difference in the continuous symbol.
Signal source 501 outputs to voltage regulator part 503 with the two paths of data signal that produces.In order to realize the QPSK modulation, before this two paths of data signal is sent to voltage regulator part 503, their amplitude need be made a distinction.For example, by signal attenuator 502 amplitude of data-signal D2 is reduced by half.
Fig. 6 is the structural representation of the voltage regulator part that uses in the embodiment of the invention.This only is an example, should not limit the protection range of claim of the present invention.Those of ordinary skills should approve a lot of variations, substitutions and modifications.Voltage regulator part 600 comprises two inputs 605 and 606 and two outputs 607 and 608.Voltage regulator part 600 receives data-signal by these two inputs 605 and 606.Voltage regulator part 600 is loaded into bias voltage on the data-signal of reception.Voltage regulator part 600 also comprises electric capacity 601 and 603 and inductance 602 and 604.According to some embodiment, these electric capacity and inductance are the delay cells during voltage is adjusted.For example, voltage regulator part 600 comprises the automatic voltage adaptation that is used to mate two bias voltages.After the data-signal of bias voltage and reception was coupled, voltage regulator part 600 was at output 607 and the 608 outputs data-signal with the bias voltage parts match.For example, voltage regulator part 600 is identical parts with voltage regulator part 503 among Fig. 5.
With reference to figure 5, after voltage regulator part 503 loaded bias voltage, voltage regulator part 503 outputed to voltage compound component 505 with two paths of data signal D4 and D5 again.In a specific embodiment, use simple voltage adder to realize voltage compound component 505.
Fig. 7 A is the schematic diagram of the signal of exporting in each stage of signal processing in electrical domain of the embodiment of the invention.This only is one embodiment of the present of invention, should not regard the restriction to claim protection range of the present invention as.Those of ordinary skills should approve a lot of variations, substitutions and modifications.As shown in the figure, the two paths of data signal D1 of signal source 501 generations is different with D2.Signal D1 and D2 have identical signal amplitude.The signal amplitude of signal D2 is approximately two times of signal amplitude of signal D3.Signal D2 and D3 and bias voltage be coupled generate signal D4 and D5 respectively.Then, signal D4 and D5 are synthesized the composite signal that processing is formed for the QPSK modulation.As an example, composite signal can be represented the information of two bits in the QPSK modulation scheme as shown in Figure 5.
Fig. 7 B and 7C are the schematic diagram of the waveform that produces in optical arena of the embodiment of the invention.
Referring to Fig. 5, the resultant voltage signal that 507 pairs of signal amplifiers are input on it carries out processing and amplifying again.In a specific embodiment, signal amplifier 507 is amplified to the resultant voltage signal on the amplification level of MZM parts 508 optimums.For example, signal amplifier 507 is amplified to composite signal about 6 volts, and the typical driving voltage of MZM parts 508 is 6 volts.
After ovennodulation, optical attenuator 510 decay are carried out attenuation processing to the light signal after modulating.In certain embodiments, optical attenuator 510 is adjusted the signal strength signal intensity of modulated light signal so that for the phase modulated conversion provides suitable amplitude, carry out this phase modulated conversion process by image intensifer 511.For example, in the QPSK modulation scheme, the signal power of modulated light signal is greater than the permission input power of image intensifer 511.Optical attenuator 510 reduces the signal power of modulated light signal, so that the signal strength signal intensity of modulated light signal is mapped to four different phase places under the QPSK modulation scheme.
Next, 511 pairs of processes of image intensifer modulated light signal carries out secondary modulation.In other embodiments of the invention, image intensifer 511 can be a semiconductor optical amplifier (SOA), but should be appreciated that image intensifer 511 also can be the nonlinear device of other type.Usually compared with the image intensifer of other type, such as erbium-doped fiber amplifier, SOA has the non-linear of height.Why SOA has highly non-linear is because the phase place of SOA can change along with the variation of pumping and/or signal power level.The non-linear inherent defect that often is considered to SOA of even now, but in an embodiment of the present invention, utilize this nonlinear characteristic of SOA, realized the purpose of M-PSK modulation.
The reduced graph of an image intensifer of Fig. 8 embodiment of the invention.This only is one embodiment of the present of invention, should not regard the restriction to claim protection range of the present invention as.Those of ordinary skills should approve a lot of variations, substitutions and modifications.Image intensifer 800 receives the amplitude modulation(PAM) light signal from input 801, receives bias voltage (for example, about 250 milliamperes bias current) from input 802, and generates the PSK light modulated at output 803.Image intensifer 800 utilizes its distinctive magnitude-phase characteristics to carry out phase modulated.Common use has high accuracy and highdensity semiconductor optical amplifier is realized image intensifer 800.
Fig. 9 is the phase modulated process schematic diagram of the embodiment of the invention.This only is one embodiment of the present of invention, should not regard the restriction to claim protection range of the present invention as.Those of ordinary skills should approve a lot of variations, substitutions and modifications.Figure 901 is to utilize the magnitude-phase characteristics of image intensifer and the schematic diagram that obtains, and this image intensifer is used for am signals is converted to phase modulated signal.Figure 90 1 comprises two curves that are used for the PSK mapping: curve 906 is used for the mapping of input range to output amplitude, and curve 905 is used for amplitude to phase mapping.For example, these amplitude/phase characteristic curves are that this image intensifer is peculiar.For carrying out the PSK modulation, image intensifer produces the phase modulated signal with two components, and these two components are phase component and range weight.Phase component as shown in figure 904 utilizes curve 905 to come from the amplitude modulated light mapping.Range weight as shown in figure 903 utilizes curve 906 to come from the amplitude modulated light mapping.
It is pointed out that Fig. 9 only is a specific embodiment.Can utilize the table of comparisons and other interpolation algorithm, or get a conversion of carrying out amplitude modulation(PAM) to the PSK modulation among both.From in essence, the output psk signal is changed according to the phase place or the amplitude characteristic of employed image intensifer.As an example, Fig. 9 shows the transfer process of modulation from the amplitude modulation(PAM) to QPSK.Use identical in essence principle, can carry out the more PSK modulation of high-order.Compare with the image intensifer that is used for the QPSK modulation, more the image intensifer that uses in the PSK of the high-order modulation should be more accurate, more stable.
Further specify embodiments of the invention in conjunction with Figure 10 and 11.Figure 10 and 11 is the reduced graph of output signal of the image intensifer after PSK modulation of the embodiment of the invention.
According to an embodiment, the invention provides a kind of method that is used to carry out M system PSK modulation.This method comprises: first signal and secondary signal are provided at least, described first signal and secondary signal be characterized as first signal amplitude level.This method comprises that also described secondary signal is carried out attenuation operations generates the 3rd signal, described the 3rd signal be characterized as the secondary signal amplification level, described secondary signal amplification level is near 50% of described first signal amplitude level.This method comprises that in addition described first signal of coupling and first bias voltage generate the 4th signal; Be coupled described the 3rd signal and second bias voltage generates the 5th signal; Synthetic described the 4th signal and the 5th signal generate the 6th signal.This method also comprises provides light.In addition, this method comprises by the light that light source provided is carried out the step that amplitude modulation(PAM) provides multistage modulated light signal.This modulation at least with the 6th signal correction.And this method comprises the step of using image intensifer this amplitude modulation(PAM) light signal to be carried out the PSK modulation.This nonlinear optical amplifier be characterized as magnitude-phase characteristics.
According to an embodiment, the invention provides a kind of system that is used to carry out M system PSK modulation.This system comprises and is used for producing at least the first signal and secondary signal source.This first signal and secondary signal be characterized as first signal amplitude level.This system comprises in addition and is used for described secondary signal is carried out the signal attenuator that attenuation operations generates the 3rd signal, the 3rd signal be characterized as the secondary signal amplification level.For example, this secondary signal amplification level is near 50% of this first signal amplitude level.This system comprises that also be used to be coupled described first signal and first bias voltage generate the 4th signal, and be coupled described the 3rd signal and second bias voltage generate the 5th voltage of signals adjustment component.In addition, this system comprises and is used for synthetic described the 4th signal and the 5th signal generates the 6th voltage of signals compound component.This system comprises the light source that light is provided in addition.In addition, this system comprises and is used for generating the modulating part of modulated light signal by this light being carried out amplitude modulation(PAM).For example, this modulation at least with the 6th signal correction.This system also comprises image intensifer, is used for this modulated light signal is carried out PSK modulation and output M system PSK modulated light signal, the image intensifer that is characterized as known magnitude-phase characteristics of this image intensifer.
According to another embodiment, the invention provides a kind of system that is used to carry out M system PSK modulation.This system comprises the signal source that is used to generate at least the first signal and secondary signal.This first signal and secondary signal be characterized as first signal amplitude level.This system also comprises and is used for described secondary signal is carried out the signal attenuator that attenuation operations generates the 3rd signal, the 3rd signal be characterized as the secondary signal amplification level.For example, the amplitude of this secondary signal is near 50% of the amplitude of this first signal.This system comprises that also be used to be coupled described first signal and first bias voltage generate the 4th signal, and be coupled the 3rd signal and second bias voltage generate the 5th voltage of signals adjustment component.In addition, this system comprises and is used for synthetic described the 4th signal and the 5th signal generates the 6th voltage of signals compound component.In addition, this system comprises and being used on amplification level described the 6th signal being carried out the amplifying signal amplifier.This system also comprises the light source that light is provided.In addition, this system comprises and is used for described light is carried out the modulating part that amplitude modulation(PAM) generates modulated light signal, this modulation at least with the 6th signal correction.And this system comprises the optical attenuator that is used for described modulated light signal is carried out attenuation processing.This system also comprises and is used for described modulated light signal is carried out the phase shift keying modulation, and the image intensifer of output M system phase shift keying modulated light signal.For example, this image intensifer is characterized as magnitude-phase characteristics.For example, show this embodiment according to Fig. 5.
Should be appreciated that compare with traditional technology, each embodiment of the present invention has various advantages.Wherein, compared with traditional system, each embodiment of the present invention uses less parts, thereby has reduced cost and complexity that system realizes.For example, compared with traditional system, the system that realizes according to embodiments of the invention uses fewer purpose modulator.The present invention also provides permission to realize the embodiment flexibly of high-order PSK modulation with this same set of method.In addition, embodiments of the invention and legacy system and method compatibility.Also have other advantages.
The above only is several specific embodiment of the present invention, and those skilled in that art are to be understood that the present invention can also have other implementation methods of a lot of and the foregoing description equivalence.Therefore should be understood that above-mentioned specific embodiment shall not be applied to restriction protection scope of the present invention, protection scope of the present invention should be as the criterion with the described scope of claim.
Claims (25)
1, a kind of M system phase shift keying modulation method is characterized in that, this method comprises:
First signal and secondary signal are provided, described first signal and secondary signal be characterized as first signal amplitude level;
Described secondary signal is carried out attenuation operations generates the 3rd signal, described the 3rd signal be characterized as the secondary signal amplification level, described secondary signal amplification level is near half of described first signal amplitude level;
Be coupled first bias voltage and described first signal generate the 4th signal;
Be coupled second bias voltage and described the 3rd signal generate the 5th signal;
Synthetic described the 4th signal and the 5th signal generate the 6th signal;
The light that light source provided is carried out amplitude modulation(PAM) generate modulated light signal, described amplitude modulation(PAM) comprises at least described the 6th signal is carried out amplitude modulation(PAM); With
Use image intensifer that described modulated light signal is carried out the phase shift keying modulation, described image intensifer be characterized as magnitude-phase characteristics.
2, method according to claim 1 is characterized in that, described method of carrying out the phase shift keying modulation comprises:
The amplitude information that suppresses amplitude shift key modulation ASK.
3, method according to claim 1 is characterized in that, described modulated light signal is a multilevel signal.
4, method according to claim 1 is characterized in that, described method of carrying out the phase shift keying modulation comprises:
Magnitude-phase characteristics according to semiconductor optical amplifier SOA is converted to corresponding phase modulated signal to described modulated light signal.
5, method according to claim 1 is characterized in that, described image intensifer is for being used to receive the semiconductor optical amplifier of the bias current that is provided by described second bias voltage.
6, method according to claim 1 is characterized in that, this method further comprises: use the amplification factor relevant with the amplitude modulation(PAM) of described light to amplify described the 6th signal.
7, method according to claim 1 is characterized in that, carries out described amplitude modulation(PAM) by Mach-Zehnder modulator MZM.
8, method according to claim 1 is characterized in that, this method further comprises: according to output level described modulated light signal is decayed.
9, method according to claim 1 is characterized in that, further comprising provides a kind of smooth quaternary phase shift keying QPSK signal.
10, method according to claim 1 is characterized in that, described first signal and secondary signal are non-return-to-zero NRZ signal.
11, method according to claim 1 is characterized in that, described first signal and secondary signal are that to be used for the signal of QPSK modulation right.
12, a kind of M system phase shift keying modulating system, this system comprises:
Signal source is used for producing at least the first signal and secondary signal, described first signal and secondary signal be characterized as first signal amplitude level;
Signal attenuator is used for that described secondary signal is carried out attenuation operations and generates the 3rd signal, described the 3rd signal be characterized as the secondary signal amplification level, described secondary signal amplification level is near half of described first signal amplitude level;
Voltage regulator part, be used to be coupled first bias voltage and described first signal generate the 4th signal, and be coupled second bias voltage and described the 3rd signal generate the 5th signal;
The voltage compound component is used for synthetic described the 4th signal and the 5th signal and generates the 6th signal;
Light source is used to provide light;
Modulating part is used for that described light is carried out amplitude modulation(PAM) and generates modulated light signal, and described amplitude modulation(PAM) comprises at least described the 6th signal is carried out amplitude modulation(PAM);
Image intensifer is used for described modulated light signal is carried out phase shift keying modulation, and output M system phase shift keying modulated light signal, described image intensifer be characterized as known magnitude-phase characteristics.
13, system according to claim 12 is characterized in that, this system further comprises signal amplifier, is used for amplifying described the 6th signal on amplification level, and described amplification level is relevant with the physical characteristic of described modulating part.
14, system according to claim 12 is characterized in that, described voltage regulator part comprises: be used for mating automatically described the 4th signal and the 5th voltage of signals matching block.
15, system according to claim 12 is characterized in that, described system further comprises optical attenuator.
16, system according to claim 12 is characterized in that, described signal source is used to provide the NRZ signal.
17, system according to claim 12 is characterized in that, described modulating part is for singly driving MZM.
18, system according to claim 12 is characterized in that, described voltage regulator part comprises the voltage accumulation device.
19, system according to claim 12 is characterized in that, described light source is a LASER Light Source.
20, a kind of M system phase shift keying modulation method, this method comprises:
First signal and secondary signal are provided, and described first signal characteristic is first signal voltage, described secondary signal be characterized as secondary signal voltage, described first signal voltage is near half of described secondary signal voltage;
The 3rd signal is provided, and described the 3rd signal is the composite signal of described first signal and secondary signal;
Utilize described the 3rd signal that light is carried out amplitude modulation(PAM) and generate modulated light signal;
Described modulated light signal is sent to image intensifer, described image intensifer be characterized as known magnitude-phase characteristics;
Utilize described image intensifer that described modulated light signal is carried out the phase shift keying modulation, described phase shift keying modulation is based on the amplitude of described modulated light signal and the known magnitude-phase characteristics of described image intensifer.
21, a kind of M system phase shift keying modulating system, this system comprises:
Signal source is used for generating at least the first signal and secondary signal, described first signal and secondary signal be characterized as first signal amplitude level;
Signal attenuator is used for that described secondary signal is carried out attenuation operations and generates the 3rd signal, the 3rd signal be characterized as the secondary signal amplification level, described secondary signal amplification level is near half of described first signal amplitude level;
Voltage regulator part, be used to be coupled first bias voltage and described first signal generate the 4th signal, and be coupled second bias voltage and described the 3rd signal generate the 5th signal;
The voltage compound component is used for synthetic described the 4th signal and the 5th signal and generates the 6th signal;
Signal amplifier is used for amplifying described the 6th signal on amplification level, and described amplification level is relevant with the physical characteristic of modulating part;
Light source is used to provide light;
Modulating part is used for that described light is carried out amplitude modulation(PAM) and generates modulated light signal, and described amplitude modulation(PAM) comprises at least described the 6th signal is carried out amplitude modulation(PAM);
Optical attenuator is used for described modulated light signal is carried out attenuation processing;
Image intensifer is used for described modulated light signal is carried out phase shift keying modulation, and output M system phase shift keying modulated light signal, described image intensifer be characterized as magnitude-phase characteristics.
22, a kind of M system phase shift keying modulation method, this method comprises:
Multiple signals are provided, and described multiple signals comprise first signal, and described multiple signals are relevant with amplitude modulation(PAM);
Light is carried out amplitude modulation(PAM) generate modulated light signal, described amplitude modulation(PAM) comprises at least described first signal is carried out amplitude modulation(PAM);
Use image intensifer that described modulated light signal is carried out the phase shift keying modulation, described image intensifer be characterized as magnitude-phase characteristics, and have the phase shift keying modulation function.
23, method according to claim 22 is characterized in that, carries out described amplitude modulation(PAM) by MZM.
24, method according to claim 22 is characterized in that, described image intensifer comprises semiconductor optical amplifier.
25, method according to claim 22 is characterized in that, the described multiple signals that provide comprise:
At least the three signal and the secondary signal is provided, described the 3rd signal and secondary signal be characterized as first signal amplitude level;
This method further comprises:
Described secondary signal is carried out attenuation processing generates the 4th signal, described the 4th signal be characterized as the secondary signal amplification level, described the 4th signal amplitude level is near half of described first signal amplitude level;
Be coupled first bias voltage and described secondary signal generate the 5th signal;
Be coupled second bias voltage and described the 4th signal generate the 6th signal;
Synthetic described the 5th signal and the 6th signal generate described first signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2007/070049 WO2008141512A1 (en) | 2007-05-24 | 2007-05-24 | System and method for m-ary phase-shifting keying modulation |
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| CN101406018A true CN101406018A (en) | 2009-04-08 |
| CN101406018B CN101406018B (en) | 2012-11-21 |
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| WO (1) | WO2008141512A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921439A (en) * | 2015-12-25 | 2017-07-04 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN107919915A (en) * | 2017-12-20 | 2018-04-17 | 武汉邮电科学研究院 | Multichannel NRZ optical signals turn the optical fiber telecommunications system and method for the more level optical signals of single channel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100578947C (en) * | 2003-11-18 | 2010-01-06 | 中国科学技术大学 | Transmitter based on multiple M dimension parallel modulaticn communication mode |
| JP4759308B2 (en) * | 2005-04-20 | 2011-08-31 | 日立情報通信エンジニアリング株式会社 | Light intensity modulation quantum cryptography optical receiver |
| DE602005007908D1 (en) * | 2005-10-14 | 2008-08-14 | Nokia Siemens Networks Gmbh | Optical single sideband modulator |
| CN100337088C (en) * | 2005-11-28 | 2007-09-12 | 中国工程物理研究院流体物理研究所 | All-fiber displacement interferometer |
-
2007
- 2007-05-24 CN CN2007800000620A patent/CN101406018B/en active Active
- 2007-05-24 WO PCT/CN2007/070049 patent/WO2008141512A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921439A (en) * | 2015-12-25 | 2017-07-04 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN107919915A (en) * | 2017-12-20 | 2018-04-17 | 武汉邮电科学研究院 | Multichannel NRZ optical signals turn the optical fiber telecommunications system and method for the more level optical signals of single channel |
| CN107919915B (en) * | 2017-12-20 | 2019-09-17 | 武汉邮电科学研究院 | Multichannel NRZ optical signal turns the optical fiber telecommunications system and method for the more level optical signals of single channel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101406018B (en) | 2012-11-21 |
| WO2008141512A1 (en) | 2008-11-27 |
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