CN101938438A - Optical signal generating and receiving methods and devices and optical transmission system - Google Patents
Optical signal generating and receiving methods and devices and optical transmission system Download PDFInfo
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Abstract
The embodiment of the invention relates to the field of communication and particularly discloses an optical signal generating method, an optical signal receiving method, an optical signal generating device, an optical signal receiving device and an optical transmission system. The optical signal generation method comprises: coding data in a differential manner to obtain first differentially coded data; coding the first differentially coded data in a differential manner to obtain second differentially coded data; and performing phase modulation on an optical carrier by using the second differentially coded data to obtain a modulation optical signal. With the optical signal generating method and the optical signal receiving method of the invention, a complex frequency offset control circuit and a phase estimation module are saved, but data transmitted by a transmitting end can be well restored from the modulation optical signal when a receiving end receives the modulation optical signal.
Description
Technical field
The present invention relates to the communications field, relate in particular to method, device and the optical transmission system of a kind of light signal generating and reception.
Background technology
In recent years, owing to have advantage highly sensitive, that selectivity is good, the coherent optical communication technology is widely used in the arterial grid of big capacity, long distance.Relevant modulation and heterodyne Detection Technique have mainly been utilized in the coherent optical communication.So-called relevant modulation, the signal that will transmit in the transmitting terminal utilization changes relevant light frequency, phase place and amplitude exactly, obtains flashlight; So-called heterodyne detects, and local oscillator light and the flashlight that utilizes the local oscillator light source to produce at receiving terminal carries out mixing in frequency mixer exactly, obtains the intermediate-freuqncy signal that changes by identical rule with signal light frequency, phase place and amplitude; Intermediate-freuqncy signal just obtains baseband signal after entering the demodulator demodulation.If the frequency of the light carrier when control local oscillator light frequency makes it modulate with transmitting terminal is identical, the frequency of the difference frequency signal that obtains after the mixing is zero, directly obtains baseband signal, and this detection mode is called homodyne detection.
In the coherent optical communication system that adopts phase modulated, utilize the phase place of the defeated baseband signal modulated optical carrier of tendency to develop at transmitting terminal, obtain flashlight, after receiving terminal adopts the heterodyne detection method that flashlight is converted into intermediate-freuqncy signal, carry out secondary demodulation again and obtain baseband signal, perhaps adopt the method for zero-difference detection that flashlight is converted into baseband signal.Figure 1A shows the structure of a kind of optical sender of the prior art, and laser produces the good light carrier of coherence, and the modulator phase place of removing modulated optical carrier with the baseband signal of input obtains flashlight and transmission then.Figure 1B shows a kind of structure of optical receiver, it adopts the method for zero-difference detection that flashlight is converted into baseband signal, 90 degree frequency mixers carry out mixing with flashlight and local oscillator light, and then survey with the light signal that the mixing of 2 pairs 90 degree of balance detection device 1 and balance detector frequency mixer obtains, obtain the I signal and the Q signal of analog baseband signal, wherein I signal and Q signal are two components of analog baseband signal, be converted to digital baseband signal with the analog to digital converter analog baseband signal again, the phase calculation module is calculated the phase place of digital baseband signal, obtain phase signal, with decoder phase signal being decoded at last obtains data-signal.This receiver adopts the method for zero-difference detection, so require the light carrier strict synchronism of local oscillator light and transmitting terminal, be Frequency Synchronization and Phase synchronization, but be difficult to accomplish the synchronous of this strictness in the reality, need in phase estimating device, adopt complicated algorithm that the phase place of digital baseband signal is estimated among Figure 1B, and will estimate that the result who obtains does on average in averager, the result that averager will obtain gives decoder, in decoder, make the phase place rotation of digital baseband signal, with the frequency difference of eliminating local oscillator light and transmitting terminal light carrier and the influence that differs.
The present inventor finds in research process, there are the following problems at least in the prior art: the optical receiver of prior art, though can eliminate the frequency difference of local oscillator light and transmitting terminal light carrier and differ the influence that is produced by complicated algorithm, the phase fuzzy problem that phase modulated itself exists but it can't solve causes making a mistake when decoding.
Summary of the invention
The embodiment of the invention provides a kind of production method of light signal, comprising:
Data are carried out differential coding, obtain the first differential coding data;
The described first differential coding data are carried out differential coding, obtain the second differential coding data;
With the second differential coding data light carrier is carried out phase modulated, obtain modulated light signal.
The embodiment of the invention also provides a kind of method of reseptance of light signal, comprising:
The modulated light signal that receives local oscillator light and adopt above-mentioned light signal generating method to produce, and described modulated light signal and local oscillator light carried out mixing obtains the light signal after the mixing;
Light signal after the mixing is surveyed, obtained analog baseband signal;
Described analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal;
Phase place to described digital baseband signal is adjudicated, and is Bit data with the phase information inverse mapping that judgement obtains;
Described Bit data is carried out differential decoding, obtain first decoded data;
Described first decoded data is carried out differential decoding, obtain initial data.
The embodiment of the invention also provides a kind of method of reseptance of light signal, it is characterized in that, comprising:
The modulated light signal that receives local oscillator light and adopt above-mentioned light signal generating method to produce, and described modulated light signal and local oscillator light carried out mixing obtains the light signal after the mixing;
Light signal after the mixing is surveyed, obtained analog baseband signal;
Described analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal;
The digital baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current digital baseband signal multiplies each other, and obtains first baseband signal;
First baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current first baseband signal multiplies each other, and obtains second baseband signal;
Phase place to described second baseband signal is adjudicated, and is initial data with the phase information inverse mapping that judgement obtains.
The embodiment of the invention also provides a kind of method of reseptance of light signal, comprising:
The modulated light signal that receives local oscillator light and adopt above-mentioned light signal generating method to produce, and described modulated light signal and local oscillator light carried out mixing obtains the light signal after the mixing;
Light signal after the mixing is surveyed, obtained analog baseband signal;
Described analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal;
Calculate the phase place of described digital baseband signal, obtain phase signal;
The back is clapped in current phase signal time-delay one do mould 2 π subtractions, obtain first phase signal with the phase signal of next bat;
The back is clapped in current first phase signal time-delay one do mould 2 π subtractions, obtain second phase signal with first phase signal of next bat.
Described second phase signal is adjudicated, obtain Bit data.
The embodiment of the invention also provides a kind of generation device of light signal, comprising:
The first differential coding module is used for data are carried out differential coding, obtains the first differential coding data;
The second differential coding module is used for the described first differential coding data are carried out differential coding, obtains the second differential coding data;
Modulator is used for according to the second differential coding data light carrier being carried out phase modulated, obtains modulated light signal.
The embodiment of the invention also provides a kind of receiving system of light signal, comprising:
Frequency mixer is used to receive the modulated light signal that local oscillator light and above-mentioned optical signal generation apparatus produce, and described local oscillator light and described modulated light signal are carried out mixing, obtains the light signal after the mixing;
Detecting module is used for the light signal after the described mixing is surveyed, and obtains analog baseband signal;
Analog to digital converter is used for described analog baseband signal is carried out analog-to-digital conversion, obtains digital baseband signal;
Judging module is used for the phase place of described digital baseband signal is adjudicated, and is Bit data with the phase information inverse mapping that judgement obtains;
The first differential decoding module is used for described Bit data is carried out differential decoding, obtains first decoded data;
The second differential decoding module is used for described first decoded data is carried out differential decoding, obtains initial data.
The embodiment of the invention also provides a kind of receiving system of light signal, comprising:
Frequency mixer is used to receive the modulated light signal that local oscillator light and above-mentioned optical signal generation apparatus produce, and described local oscillator light and described modulated light signal are carried out mixing, obtains the light signal after the mixing;
Detecting module is used for the light signal after the described mixing is surveyed, and obtains analog baseband signal;
Analog-to-digital conversion module is used for described analog baseband signal is carried out analog-to-digital conversion, obtains digital baseband signal;
First conjugate module is used to calculate the conjugated signal of described digital baseband signal;
First time delay module is used for the bat of delaying time of the conjugated signal of described digital baseband signal is obtained first time delayed signal;
First multiplier is used for described first time delayed signal and described digital baseband signal are multiplied each other, and obtains first baseband signal;
Second conjugate module is used to calculate the conjugated signal of described first baseband signal;
Second time delay module is used for the bat of delaying time of the conjugated signal of described first baseband signal is obtained second time delayed signal;
Second multiplier is used for described second time delayed signal and described first baseband signal are multiplied each other, and obtains second baseband signal;
Judging module is used for the phase place of described second baseband signal is adjudicated, and is initial data with the phase information inverse mapping that judgement obtains.
The embodiment of the invention also provides a kind of receiving system of light signal, comprising:
Frequency mixer is used to receive the modulated light signal that local oscillator light and above-mentioned optical signal generation apparatus produce, and described local oscillator light and described modulated light signal are carried out mixing, obtains the light signal after the mixing;
Detecting module is used for the light signal after the described mixing is surveyed, and obtains analog baseband signal;
Analog-to-digital conversion module is used for described analog baseband signal is carried out analog-to-digital conversion, obtains digital baseband signal;
The phase calculation module is used to calculate the phase place of described digital baseband signal, obtains phase signal;
First time delay module is used for the bat of delaying time of described phase signal is obtained first time delayed signal;
First subtracter is used for described phase signal and described first time delayed signal are done mould 2 π subtractions, obtains first phase signal;
Second time delay module is used for the bat of delaying time of described first phase signal is obtained second time delayed signal;
Second subtracter is used for described first phase signal and described second time delayed signal are done mould 2 π subtractions, obtains second phase signal;
Judging module is used for described second phase signal is adjudicated, and obtains initial data.
The embodiment of the invention also provides a kind of optical transmission system, comprises above-mentioned optical signal generation apparatus and above-mentioned any light signal receiving.
In the embodiment of the invention, the data of needs transmission are carried out differential coding twice, the phase place of removing modulated optical carrier then with the data behind twice differential coding, the phase information of the modulated light signal that obtains at last is not the data that direct correspondence will be transmitted, but the data that the phase information of modulated light signal obtains after through the twice differential decoding data of corresponding transmission, therefore make receiving terminal adopt local oscillator light and modulated light signal to carry out the digital baseband signal that obtains after the processing such as mixing, need carry out twice differential decoding and just can recover the data that transmitting terminal transmits, the process of twice decoding not only can eliminate because the asynchronous phase fuzzy problem that causes of phase place of local oscillator light and transmitting terminal light carrier, can also further eliminate because the asynchronous phase fuzzy problem that causes of frequency of local oscillator light and transmitting terminal light carrier makes that the realization of receiving terminal receiving system is simple.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.
Figure 1A shows the structural representation of optical sender in the prior art;
Figure 1B shows the structural representation of optical receiver in the prior art;
Fig. 2 shows the structural representation of optical signal generation apparatus in the embodiment of the invention;
Fig. 3 A shows the structural representation of differential encoder in the embodiment of the invention;
Fig. 3 B shows the structural representation of differential decoder in the embodiment of the invention;
Fig. 4 shows first structural representation of light signal receiving in the embodiment of the invention;
Fig. 5 shows second structural representation of light signal receiving in the embodiment of the invention;
Fig. 6 shows the 3rd structural representation of light signal receiving in the embodiment of the invention;
Fig. 7 shows the schematic flow sheet of light signal generating method in the embodiment of the invention;
Fig. 8 shows the first pass schematic diagram of light signal method of reseptance in the embodiment of the invention;
Fig. 9 shows second schematic flow sheet of light signal method of reseptance in the embodiment of the invention;
Figure 10 shows the 3rd schematic flow sheet of light signal method of reseptance in the embodiment of the invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described.
The embodiment of the invention provides a kind of generation device of light signal, and its structure comprises as shown in Figure 2: 201, the second differential coding unit 202, the first differential coding unit, modulator 203.
The 201 pairs of data in the first differential coding unit are carried out differential coding, obtain the first differential coding data, and then carry out differential coding with the 202 pairs first differential coding data in the second differential coding unit, obtain the second differential coding data, the modulator 203 usefulness second differential coding data are carried out phase modulated to light carrier, obtain modulated light signal.The generation device of the light signal of the embodiment of the invention can further include the laser that is used to produce light carrier.
Phase modulated is to utilize the out of phase of carrier wave to characterize the data message of input, for a M=2
K(K=1,2, the 3......) phase modulated of system, it is exactly the data message that characterizes input with the M kind phase place of carrier wave, every K position Bit data is mapped to a phase place of carrier wave when modulating.Wherein, K position Bit data has been represented a symbol of M system; The K position occupied time span of Bit data is referred to as symbol period, and each symbol period is referred to as a bat; The M kind phase place of carrier wave is referred to as the main value phase place.
In the embodiment of the invention, modulator 203 is with the second differential coding data of input the phase place of light carrier to be modulated, and it can adopt BPSK, QPSK, 8PSK modulator etc.In the present embodiment, for adopting which kind of modulator not do concrete restriction, as long as the modulator that adopts has the function of phase modulated.
The first differential coding unit in the embodiment of the invention and second coding unit all can adopt the differential encoder of structure shown in Fig. 3 A to realize.The encoder of structure comprises adder and delay unit shown in Fig. 3 A.The output Y that delay unit is current with adder
[N]After clapping, time-delay one delivers in the adder input X with next bat
[N+1]Do the addition of mould M, obtain the output Y of next bat
[N+1], promptly
The addition of expression mould M.Wherein, M is the system number of the phase modulated that modulator adopted, if the phase modulated of 4 systems that phase-modulator adopts, the M here just is 4; The addition of mould M is meant two number additions, then the result of addition is obtained the process of remainder divided by M; Inputing or outputing of each bat all is symbols of M system, i.e. the input of each bat is (as X
[N+1]) all are K position Bit datas, the output of each bat is (as Y
[N+1]) also be K position Bit data.For example, current output Y
[N]Be two Bit datas (10), the input X of next bat
[N+1]Be two Bit datas (11), then they done the addition of mould 4, be equivalent to (2+3), obtain remainder 1, then the output Y of next bat divided by 4
[N+1]Be two Bit datas (01).
In the prior art, differential coding is a kind of common technology, so the first differential coding unit in the present embodiment can also adopt existing various differential encoder except adopting the differential encoder of structure shown in Fig. 3 A, present embodiment does not limit it.
In the described optical signal generation apparatus of a specific embodiment, what modulator adopted is qpsk modulator, and what first coding unit and second coding unit adopted all is differential encoders of structure shown in Fig. 3 A.The concrete example that this optical signal generation apparatus produces light signal is as follows:
If needing the data of transmission is " 01 11 10 11 00 01 11 ", the first differential coding unit carries out differential coding to it, the first differential coding data that obtain are " 01 00 10 01 01 10 01 ", and then it is carried out differential coding with the second differential coding unit, the second differential coding data that obtain are " 01 01 11 0,001 11 00 ", qpsk modulator is modulated the phase place of light carrier with the second differential coding data then, with the above-mentioned second differential coding data map is the phase place of light carrier, be respectively: 3 π/4,3 π/4,7 π/4, π/4,3 π/4,7 π/4, π/4.
Need to prove that the mapping relations that above-mentioned qpsk modulator adopts are: set of signals { 00,01,10,11} is mapped as the set { π/4,3 π/4 of 4 kinds of phase places compositions of light carrier, 5 π/4,7 π/4}, in another embodiment, qpsk modulator can also adopt following mapping relations: with set of signals { 00,01,10,11} is mapped as the set { 0 of 4 kinds of phase places compositions of light carrier, pi/2,3 pi/2s, π }.
In the present embodiment, the data of needs transmission are carried out differential coding twice, the phase place of removing modulated optical carrier then with the data behind twice differential coding, the phase information of the modulated light signal that obtains at last is not the data that direct correspondence will be transmitted, but the data that the phase information of modulated light signal obtains after through the twice differential decoding data of corresponding transmission, therefore make receiving terminal adopt local oscillator light and modulated light signal to carry out the digital baseband signal that obtains after the processing such as mixing, need carry out twice differential decoding and just can recover the data that transmitting terminal transmits, the process of twice decoding not only can eliminate because the asynchronous phase fuzzy problem that causes of phase place of local oscillator light and transmitting terminal light carrier, can also further eliminate because the asynchronous phase fuzzy problem that causes of frequency of local oscillator light and transmitting terminal light carrier makes that the realization of receiving terminal receiving system is simple.
The embodiment of the invention also provides a kind of receiving system of light signal, be used for receiving the modulated light signal of the optical signal generation apparatus generation of structure shown in Figure 2 at receiving terminal, and this modulated light signal handled the data that recover transmission, its structure comprises as shown in Figure 4: frequency mixer 401, detecting module 402, analog to digital converter 403, judging module 404, the first differential decoding module 405, the second differential decoding module 406.
Get light signal after 402 pairs of mixing of detecting module and survey, obtain two components of analog baseband signal: I signal and Q signal, analog baseband signal can be expressed as: I+jQ.In the present embodiment, detecting module 402 can be made up of balance detection device 1 and balance detector 2, and the light signal of two balance detection devices after to mixing carries out balance detection, obtains the I signal and and the Q signal of analog baseband signal respectively.
Analog to digital converter 403 carries out analog-to-digital conversion with the analog baseband signal that detecting module 402 obtains, and obtains digital baseband signal.The digital signal base-band signal is a complex signal, has two components to be respectively I
KSignal and Q
KSignal, complex signal can be expressed as: I
K+ jQ
K
The phase place of 404 pairs of digital baseband signals of judging module is adjudicated, and is Bit data with the phase information inverse mapping that judgement obtains.Concrete is that the phase place of 404 pairs of digital baseband signals of judging module is adjudicated, and according to the modulation system of transmitting terminal employing, the phase information that obtains is carried out inverse mapping then.For example, what transmitting terminal adopted is the QPSK modulation system, the mapping relations that adopt are: set of signals 00,01,10,11} is mapped to phase sets { π/4 of carrier wave, 3 π/4,5 π/4,7 π/4}, herein, 404 this mapping relations of judging module according to the QPSK modulation system, the phase information inverse mapping that judgement is obtained is that Bit data: phase place π/4 inverse mappings are Bit data 00, phase place 3 π/4 inverse mappings are Bit data 01, and phase place 5 π/4 inverse mappings are Bit data 10, and phase place 7 π/4 inverse mappings are Bit data 11.
The Bit data that 405 pairs of judging module 403 of the first differential decoding module obtain carries out differential decoding, obtains first decoded data.406 pairs first decoded datas of the second differential decoding module carry out differential decoding, obtain initial data, and the initial data that the second differential decoding module 406 obtains is the data of transmitting terminal transmission.The first differential decoding unit and second decoding unit can adopt the differential decoder of structure shown in Fig. 3 B, also can adopt differential decoder of the prior art.Differential decoder shown in Fig. 3 B comprises a delay unit and subtracter, deliver in the subtracter after delay unit is clapped current input time delay one and do mould M subtraction with the input of next bat, obtain the output of next bat, wherein, mould M subtraction is the inverse operation of mould M addition, mould M subtraction is meant that the result that two numbers are subtracted each other obtains remainder divided by M, specific practice is to subtract each other the back to judge that the result subtract each other is whether between 0～M, if not, then the result that will subtract each other adds behind the M result as the subtraction of mould M, if the result who subtracts each other is between 0～M, then the result that will subtract each other is directly as the result of the subtraction of mould M; M is the system number of the phase modulated that modulator adopted in the transmitting terminal, if phase-modulator adopts the phase modulated of 4 systems, the M here just is 4; Inputing or outputing of each bat all is symbols of M system, i.e. the input of each bat all is K position Bit datas, and the output of each bat also is K position Bit data.For example, current two Bit datas (11) that are input as, next bat be input as two Bit datas (01), then they are done the subtraction of mould 4, be equivalent to 2-3+4, obtain 3, then next bat is output as two Bit datas (11).
The light signal receiving that the embodiment of the invention provides, because the digital baseband signal that obtains is carried out differential decoding twice, so not only can eliminate the asynchronous phase fuzzy problem that causes of phase place between local oscillator light and the transmitting terminal light carrier, can also further eliminate the asynchronous phase fuzzy problem that causes of frequency between local oscillator light and the transmitting terminal light carrier, and the light signal receiving that the embodiment of the invention provides does not need frequency deviation control circuit and phase estimation module, but still can guarantee the receptivity of light signal receiving.
The embodiment of the invention also provides a kind of receiving system of light signal, be used for receiving the modulated light signal of the optical signal generation apparatus generation of structure shown in Figure 2 at receiving terminal, and this modulated light signal handled the data that recover transmitting terminal transmission, its structure comprises as shown in Figure 5: frequency mixer 501, detecting module 502, analog to digital converter 503, the first conjugation computing unit 504, first delay unit 505, first multiplier 506, the second conjugation computing unit 507, second delay unit 508, second multiplier 509, judging module 510.Wherein, frequency mixer 501, detecting module 502, analog to digital converter 503 are identical respectively with frequency mixer 401, detecting module 402, analog to digital converter 403 in the device shown in Figure 4, repeat no more here.
The first conjugation computing unit 504 is used to calculate the conjugated signal of the digital baseband signal that analog to digital converter 503 obtains, and obtains first conjugated signal.The digital baseband signal that analog to digital converter obtains can be expressed as: I
K+ jQ
K, calculate its conjugated signal, obtain first conjugated signal, be expressed as: I
K-jQ
KNeed to prove that above-mentioned representation is the Algebraic Expression form of complex signal, can also represent above-mentioned complex signal with exponential form, is expressed as above-mentioned digital baseband signal
First conjugated signal is expressed as
Wherein, A
KThe amplitude of expression digital baseband signal,
The phase place of expression digital baseband signal.
The second conjugation computing unit 507 calculates the conjugated signal of first baseband signal, obtains second conjugated signal.First baseband signal that is input to after second delay unit 508 is clapped current second conjugated signal time-delay one in second multiplier 509 with next bat multiplies each other, and obtains second baseband signal.
The phase place of 510 pairs second baseband signals of judging module is adjudicated, and is initial data with the phase information inverse mapping that judgement obtains.The initial data that this moment, decision unit obtained is the data of transmitting terminal transmission.Associated description among concrete other embodiment of course of work REFERENCE TO RELATED of judging module.
The light signal receiving that the embodiment of the invention provides, because the digital baseband signal that obtains is carried out differential decoding twice, so not only can eliminate the asynchronous phase fuzzy problem that causes of phase place between local oscillator light and the transmitting terminal light carrier, can also further eliminate the asynchronous phase fuzzy problem that causes of frequency between local oscillator light and the transmitting terminal light carrier, and the light signal receiving that the embodiment of the invention provides does not need frequency deviation control circuit and phase estimation module, but still can guarantee the receptivity of light signal receiving.
The embodiment of the invention also provides a kind of receiving system of light signal, be used for receiving the modulated light signal of the optical signal generation apparatus generation of structure shown in Figure 2 at receiving terminal, and this modulated light signal handled the data that recover transmitting terminal transmission, its structure comprises as shown in Figure 6: frequency mixer 601, detecting module 602, analog to digital converter 603, phase calculation module 604, first delay unit 605, first subtracter 606, second delay unit 607, second subtracter 608, judging module 609.Wherein, frequency mixer 601, detecting module 602, analog to digital converter 603 are identical respectively with frequency mixer 401, detecting module 402, analog to digital converter 403 in the device shown in Figure 4, repeat no more here.
The phase place of the digital baseband signal that phase calculation module 604 calculating analog to digital converters 603 obtain obtains phase signal.First delay unit 605 is input to the subtraction of being mould 2 π in first subtracter 606 with the phase signal of next bat after current phase signal time-delay one is clapped, and obtains first phase signal.Second delay unit 607 is input to the subtraction of being mould 2 π in second subtracter 608 with first phase signal of next bat after current first phase signal time-delay one is clapped, and obtains second phase signal.609 pairs second phase signals of judging module are adjudicated, and obtain initial data.Because second phase signal itself is exactly a phase information, so process that 609 pairs second phase signals of judging module are adjudicated, be actually the process of identification phase place, and then the modulation system that when generating modulated light signal, is adopted according to transmitting terminal, the phase place of identification is carried out inverse mapping, obtain initial data, the initial data that judging module 609 finally obtains is the data of transmitting terminal transmission.
The light signal receiving that the embodiment of the invention provides, because the digital baseband signal that obtains is carried out differential decoding twice, so not only can eliminate the asynchronous phase fuzzy problem that causes of phase place between local oscillator light and the transmitting terminal light carrier, can also further eliminate the asynchronous phase fuzzy problem that causes of frequency between local oscillator light and the transmitting terminal light carrier, and the light signal receiving that the embodiment of the invention provides does not need frequency deviation control circuit and phase estimation module, but still can guarantee the receptivity of light signal receiving.
The embodiment of the invention also provides a kind of optical transmission system, comprises any light signal receiving in the optical signal generation apparatus of structure shown in Figure 2 and Fig. 4, Fig. 5, the structure shown in Figure 6.In this optical transmission system, at transmitting terminal, the data of utilizing the optical signal device of structure shown in Figure 2 will need to transmit are carried out differential coding twice, with the data behind twice differential coding light carrier is carried out phase modulated then, obtain modulated light signal, modulated light signal is coupled in the optical fiber, transmits to receiving terminal; At receiving terminal, the light signal receiving of any one structure receives the modulated light signal that transmits in the optical fiber among Fig. 4, Fig. 5, Fig. 6, then modulated light signal is converted into digital baseband signal, again digital baseband signal is carried out differential decoding twice, obtain the data of transmitting terminal transmission.
The optical transmission system that the embodiment of the invention provides carries out differential coding twice in the data that transmitting terminal will need to transmit, and then with the data behind twice differential coding light carrier is carried out phase modulated; At receiving terminal digital baseband signal is carried out twice differential decoding and recover the data that transmitting terminal transmits, make the light signal receiving of receiving terminal not need frequency deviation control circuit and phase estimation module, but still can be so that whole system keeps an error performance preferably.
The invention provides a kind of method that produces light signal, as shown in Figure 7, comprising its method flow:
Step S701: data are carried out differential coding, obtain differential coding data for the first time.
Step S702: the first differential coding data are carried out differential coding, obtain the second differential coding data.
Step S703: with the second differential coding data light carrier is carried out phase modulated, obtain modulated light signal.
In the present embodiment, the data of needs transmission are carried out differential coding twice, the phase place of removing modulated optical carrier then with the data behind twice differential coding, the phase information of the modulated light signal that obtains at last is not the data that direct correspondence will be transmitted, but the data that the phase information of modulated light signal obtains after through the twice differential decoding data of corresponding transmission, therefore make receiving terminal adopt local oscillator light and modulated light signal to carry out the digital baseband signal that obtains after the processing such as mixing, need carry out twice differential decoding and just can recover the data that transmitting terminal transmits, the process of twice decoding not only can eliminate because the asynchronous phase fuzzy problem that causes of phase place of local oscillator light and transmitting terminal light carrier, can also further eliminate because the asynchronous phase fuzzy problem that causes of frequency of local oscillator light and transmitting terminal light carrier makes that the realization of receiving terminal receiving system is simple.
The embodiment of the invention also provides a kind of method of reseptance of light signal, is used to receive the modulated light signal that adopts method shown in Figure 7 to produce, and recovers the data of transmitting terminal transmission after handling, and its method flow schematic diagram comprises as shown in Figure 8:
Step S801: receive local oscillator light and modulated light signal, and modulated light signal and local oscillator light are carried out mixing, obtain the light signal after the mixing.
Local oscillator is only produced by the local laser of receiving terminal, and modulated light signal is to adopt method shown in Figure 7 to produce.
Step S802: the light signal after the mixing is surveyed, obtained analog baseband signal.
Concrete, the light signal of the method that can adopt balance detection after to mixing surveyed, and obtains two components of analog baseband signal respectively: I signal and Q signal, and analog baseband signal can be expressed as: I+jQ.
Step S803: analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal.
The I signal and the Q signal of the analog baseband signal that previous step is obtained suddenly convert digital signal respectively to, obtain two component: I of digital baseband signal
KSignal and Q
KSignal, digital baseband signal can be expressed as: I
K+ jQ
K
Step S804: the phase place to digital baseband signal is adjudicated, and is Bit data with the phase information inverse mapping that judgement obtains.
Because local oscillator light frequency, phase place are difficult to and frequency, the Phase synchronization of the light carrier of transmitting terminal, causing the phase place of the digital baseband signal that obtains is not to concentrate on the main value phase place, but be dispersed near the main value phase place, when the phase place of digital baseband signal is adjudicated, its phase place judgement is immediate main value phase place.For example: modulated light signal is to adopt the QPSK modulation to generate, four kinds of phase places utilizing are respectively: π/4,3 π/4,5 π/4,7 π/4, and be 47 ° in the phase place of the digital baseband signal in a certain moment that receiving terminal obtains, the above-mentioned four kinds of main value phase places of this phase value are compared, π/4th, its immediate main value phase place, the phase place judgement of digital baseband signal that should be constantly is π/4.The modulation system that adopts according to transmitting terminal then, with the above-mentioned phase information inverse mapping that obtains is Bit data, the modulation system that adopts as transmitting terminal is the QPSK modulation system, the mapping relations of its utilization are: set of signals 00,01,10,11} is mapped as phase sets { π/4,3 π/4,5 π/4,7 π/4}, according to this mapping relations of QPSK modulation system, the phase information that judgement obtains is carried out inverse mapping, be Bit data 00 as phase place π/4 inverse mappings with above-mentioned judgement.
Step S805: Bit data is carried out differential decoding, obtain first decoded data.
Step S806: first decoded data is carried out differential decoding, obtain initial data.Initial data in the present embodiment refers to the data of transmitting terminal transmission.
The process of the differential decoding among step S805 and the step S806, the associated description of other embodiment of REFERENCE TO RELATED repeats no more here.
The light signal method of reseptance that the embodiment of the invention provides, because the digital baseband signal that obtains is carried out differential decoding twice, so not only can eliminate the asynchronous phase fuzzy problem that causes of phase place between local oscillator light and the transmitting terminal light carrier, can also further eliminate the asynchronous phase fuzzy problem that causes of frequency between local oscillator light and the transmitting terminal light carrier, and the light signal method of reseptance that the embodiment of the invention provides does not need local oscillator light is carried out frequency deviation control and phase estimation, can guarantee still that but the data that recover at last have the lower error rate.
The embodiment of the invention also provides a kind of method of reseptance of light signal, is used to receive the modulated light signal that adopts method shown in Figure 7 to produce, and recovers the data of transmitting terminal transmission after handling, and its method flow schematic diagram as shown in Figure 9.Wherein, step S901, S902, S903 are identical respectively with step S801, S802, S803 in the method shown in Figure 8, no longer it are described in detail here.
Step S904: the digital baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current digital baseband signal multiplies each other, and obtains first baseband signal.
In this step, the digital baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current digital baseband signal multiplies each other, in fact the phase place that is equivalent to front and back two are clapped the digital baseband signal of (perhaps former and later two constantly) is subtracted each other, and also is equivalent to realize the first difference decoding.Need to prove that first baseband signal in this step still is a complex signal.
Step S905: first baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current first baseband signal multiplies each other, and obtains second baseband signal.
Step S906: the phase place to second baseband signal is adjudicated, and is initial data with the phase information inverse mapping that judgement obtains, and this initial data is the data of transmitting terminal transmission.Concrete, the phase place of second baseband signal is adjudicated, obtain phase information, the modulation system of taking when generating modulated light signal according to transmitting terminal is a Bit data with the phase information inverse mapping then.What take as transmitting terminal is the phase modulation method of M system, and then the phase information inverse mapping with second baseband signal of each bat is the K Bit data, wherein, and M=2
K(K=1,2,3......).
The light signal method of reseptance that the embodiment of the invention provides, because the digital baseband signal that obtains is carried out differential decoding twice, so not only can eliminate the asynchronous phase fuzzy problem that causes of phase place between local oscillator light and the transmitting terminal light carrier, can also further eliminate the asynchronous phase fuzzy problem that causes of frequency between local oscillator light and the transmitting terminal light carrier, and the light signal method of reseptance that the embodiment of the invention provides do not need to local oscillator light carry out frequency deviation control and and phase estimation, can guarantee still that but the data that recover at last have the lower error rate.
The embodiment of the invention also provides a kind of method of reseptance of light signal, is used to receive the modulated light signal that adopts method shown in Figure 7 to produce, and recovers the data of transmitting terminal transmission after handling, and its method flow schematic diagram as shown in figure 10.Wherein, step S1001, S1002, S1003 are identical respectively with step S801, S802, S803 in the method shown in Figure 8, no longer it are described in detail here.
Step S1004: calculate the phase place of digital baseband signal, obtain phase signal.
In this step, the concrete phase place that can adopt Arg () function calculation digital baseband signal obtains phase signal.
Step S1005: the back is clapped in current phase signal time-delay one do mould 2 π subtractions, obtain first phase signal with the phase signal of next bat.
The subtraction of mould mould 2 π in this step is similar to the subtraction of mould M, the phase signal that back and next bat are clapped in current phase signal time-delay one subtracts each other, if the result who subtracts each other is not within the scope of 0～2 π, then the result that will subtract each other adds or deducts the value that obtains behind n 2 π result as mould 2 π subtractions, wherein, the value of n must make that the result who subtracts each other adds or deduct the value that obtains behind n 2 π must be within 0～2 π; If the result who subtracts each other is within the scope of 0～2 π, then with the result of this result as mould 2 π subtractions.
Step S1006: the back is clapped in the phase place time-delay one of current first signal do mould 2 π subtractions, obtain second phase signal with the phase signal of next bat.
Step S1007: second phase signal is adjudicated, obtain initial data.
Second phase signal itself is exactly a phase information, in this step second phase signal is adjudicated, be actually the process of identification phase place, and then the modulation system that when generating modulated light signal, is adopted according to transmitting terminal, the phase place of identification is carried out inverse mapping, obtain initial data.The initial data that obtains in this step is the data of transmitting terminal transmission.
The light signal method of reseptance that the embodiment of the invention provides, because the digital baseband signal that obtains is carried out differential decoding twice, so not only can eliminate the asynchronous phase fuzzy problem that causes of phase place between local oscillator light and the transmitting terminal light carrier, can also further eliminate the asynchronous phase fuzzy problem that causes of frequency between local oscillator light and the transmitting terminal light carrier, and the light signal method of reseptance that the embodiment of the invention provides do not need to local oscillator light carry out frequency deviation control and and phase estimation, can guarantee still that but the data that recover at last have the lower error rate.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and 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 with the protection range of claims.
Claims (9)
1. the production method of a light signal is characterized in that, comprising:
Data are carried out differential coding, obtain the first differential coding data;
The described first differential coding data are carried out differential coding, obtain the second differential coding data;
With the second differential coding data light carrier is carried out phase modulated, obtain modulated light signal.
2. the method for reseptance of a light signal is characterized in that, comprising:
The modulated light signal that receives local oscillator light and adopt the described method of claim 1 to produce, and described modulated light signal and local oscillator light carried out mixing obtains the light signal after the mixing;
Light signal after the mixing is surveyed, obtained analog baseband signal;
Described analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal;
Phase place to described digital baseband signal is adjudicated, and is Bit data with the phase information inverse mapping that judgement obtains;
Described Bit data is carried out differential decoding, obtain first decoded data;
Described first decoded data is carried out differential decoding, obtain initial data.
3. the method for reseptance of a light signal is characterized in that, comprising:
The modulated light signal that receives local oscillator light and adopt the described method of claim 1 to produce, and described modulated light signal and local oscillator light carried out mixing obtains the light signal after the mixing;
Light signal after the mixing is surveyed, obtained analog baseband signal;
Described analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal;
The digital baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current digital baseband signal multiplies each other, and obtains first baseband signal;
First baseband signal that back and next bat are clapped in the conjugated signal time-delay one of current first baseband signal multiplies each other, and obtains second baseband signal;
Phase place to described second baseband signal is adjudicated, and is initial data with the phase information inverse mapping that judgement obtains.
4. the method for reseptance of a light signal is characterized in that, comprising:
The modulated light signal that receives local oscillator light and adopt the described method of claim 1 to produce, and described modulated light signal and local oscillator light carried out mixing obtains the light signal after the mixing;
Light signal after the mixing is surveyed, obtained analog baseband signal;
Described analog baseband signal is carried out analog-to-digital conversion, obtain digital baseband signal;
Calculate the phase place of described digital baseband signal, obtain phase signal;
The back is clapped in current phase signal time-delay one do mould 2 π subtractions, obtain first phase signal with the phase signal of next bat;
The back is clapped in current first phase signal time-delay one do mould 2 π subtractions, obtain second phase signal with first phase signal of next bat.
Described second phase signal is adjudicated, obtain initial data.
5. an optical signal generation apparatus is characterized in that, comprising:
The first differential coding module is used for data are carried out differential coding, obtains the first differential coding data;
The second differential coding module is used for the described first differential coding data are carried out differential coding, obtains second differential coding;
Modulator is used for according to the second differential coding data light carrier being carried out phase modulated, obtains modulated light signal.
6. a light signal receiving is characterized in that, comprising:
Frequency mixer is used to receive the modulated light signal that the described device of local oscillator light and claim 5 produces, and described local oscillator light and described modulated light signal are carried out mixing, obtains the light signal after the mixing;
Detecting module is used for the light signal after the described mixing is surveyed, and obtains analog baseband signal;
Analog to digital converter is used for described analog baseband signal is carried out analog-to-digital conversion, obtains digital baseband signal;
Judging module is used for the phase place of described digital baseband signal is adjudicated, and is Bit data with the phase information inverse mapping that judgement obtains;
The first differential decoding module is used for described Bit data is carried out differential decoding, obtains first decoded data;
The second differential decoding module is used for described first decoded data is carried out differential decoding, obtains initial data.
7. a light signal receiving is characterized in that, comprising:
Frequency mixer is used to receive the modulated light signal that the described device of local oscillator light and claim 5 produces, and described local oscillator light and described modulated light signal are carried out mixing, obtains the light signal after the mixing;
Detecting module is used for the light signal after the described mixing is surveyed, and obtains analog baseband signal;
Analog-to-digital conversion module is used for described analog baseband signal is carried out analog-to-digital conversion, obtains digital baseband signal;
First conjugate module is used to calculate the conjugated signal of described digital baseband signal;
First time delay module is used for the bat of delaying time of the conjugated signal of described digital baseband signal is obtained first time delayed signal;
First multiplier is used for described first time delayed signal and described digital baseband signal are multiplied each other, and obtains first baseband signal;
Second conjugate module is used to calculate the conjugated signal of described first baseband signal;
Second time delay module is used for the bat of delaying time of the conjugated signal of described first baseband signal is obtained second time delayed signal;
Second multiplier is used for described second time delayed signal and described first baseband signal are multiplied each other, and obtains second baseband signal;
Judging module is used for the phase place of described second baseband signal is adjudicated, and is initial data with the phase information inverse mapping that judgement obtains.
8. a light signal receiving is characterized in that, comprising:
Frequency mixer is used to receive the modulated light signal that the described device of local oscillator light and claim 5 produces, and described local oscillator light and described modulated light signal are carried out mixing, obtains the light signal after the mixing;
Detecting module is used for the light signal after the described mixing is surveyed, and obtains analog baseband signal;
Analog-to-digital conversion module is used for described analog baseband signal is carried out analog-to-digital conversion, obtains digital baseband signal;
The phase calculation module is used to calculate the phase place of described digital baseband signal, obtains phase signal;
First time delay module is used for the bat of delaying time of described phase signal is obtained first time delayed signal;
First subtracter is used for described phase signal and described first time delayed signal are done mould 2 π subtractions, obtains first phase signal;
Second time delay module is used for the bat of delaying time of described first phase signal is obtained second time delayed signal;
Second subtracter is used for described first phase signal and described second time delayed signal are done mould 2 π subtractions, obtains second phase signal;
Judging module is used for described second phase signal is adjudicated, and obtains initial data.
9. an optical transmission system is characterized in that, comprising: each described light signal receiving of optical signal generation apparatus as claimed in claim 5 and claim 6-8.
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