CN111970221B - High-noise-resistance P-bit optical transmission method based on multi-probability distribution - Google Patents
High-noise-resistance P-bit optical transmission method based on multi-probability distribution Download PDFInfo
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- CN111970221B CN111970221B CN202010612402.2A CN202010612402A CN111970221B CN 111970221 B CN111970221 B CN 111970221B CN 202010612402 A CN202010612402 A CN 202010612402A CN 111970221 B CN111970221 B CN 111970221B
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Abstract
The invention discloses a high noise-resistant P bit optical transmission method based on multi-probability distribution, which divides subcarriers into signal streams with 6 modes, multiplexes the signal streams, transmits the multiplexed signal streams to one core of a 19-core 6-mode optical fiber through an optical fiber fan-in device, and transmits the multiplexed signal streams to different transmitters of the other 18 coresThe 18 pseudo-random binary signals of the same wavelength are modulated using different binary sequences. The 19 signals are sent out through a 19-core 6-mode optical fiber and received and processed by a signal receiving device; probability shaping is carried out on the optical signals by adopting Maxwell-Boltzmann distribution on subcarriers of different modes by multi-probability coding modulation, wherein probability shaping scaling factors of high-order modes
With values greater than the fundamental mode
And (4) taking values. The invention has the technical advantages of high transmission efficiency and strong noise resistance.
Description
Technical Field
The invention relates to the technical field of communication technology, in particular to a high noise-resistant P bit optical transmission method based on multi-probability distribution.
Background
With the rapid growth of internet services and emerging bandwidth applications, the traffic in data center networks, access networks and optical backbone networks has increased exponentially in recent years, and this trend is expected to continue in the foreseeable future. However, previous studies have shown that the transmission capacity of single mode optical fibres is rapidly approaching its fundamental shannon limit. In order to break through the capacity limit of single-core single-mode fibers, researchers introduce multi-core fibers and few-mode fibers in the aspect of space multiplexing, and ultrahigh-capacity Space Division Multiplexing (SDM) can enable the transmission capacity of an optical transmission system to reach a P bit level. The multi-core multiplexing (MCM) and few-mode multiplexing (FMM) technology is researched, signal multiplexing on two dimensions of a fiber core and a transmission mode is realized in the multi-core few-mode optical fiber, and the system frequency spectrum efficiency and the transmission capacity are further improved.
The probability shaping technology can reduce the difference between the actual transmission signal information transmission rate and the Shannon capacity limit by redesigning the QAM signal constellation distribution, thereby achieving the purpose of improving the channel capacity. The key theory and application research of the probability shaping technology are widely concerned at home and abroad. The principle of probability shaping is that when constellation points obey Maxwell Boltzmann distribution, the minimization of average transmission energy can be realized under the given transmission entropy, so that the sensitivity gain is obtained, and the tolerance of the system to the nonlinear effect and noise is improved. The data bit stream is converted into non-uniformly distributed symbols by assigning different probabilities to each symbol, and the final non-uniformly distributed modulation symbol stream is generated through FEC coding and constellation point mapping.
At present, the prior art adopting the probability shaping technology is not found in a P-bit-level optical transmission system, the T bit of the traditional single-mode optical fiber is the limit, one channel is used, the transmission speed is low, but the optical signal quality is better, the 19-core 6-mode optical fiber has 114 channels for parallel transmission, the transmission speed is very high and can reach the P bit, but the multimode optical fiber has the problems that the high-order mode loss is higher, the mode coupling strength is higher, the optical signal quality based on the high-order mode transmission is poorer, and the error rate performance is insufficient.
Disclosure of Invention
The invention aims to solve the problems mentioned in the background technology and provides a high noise-resistant P bit optical transmission method based on multi-probability distribution.
In this patent, we propose a multi-probability distributed high noise immunity P-bit optical transmission method.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a high noise-resistant P bit optical transmission method based on multi-probability distribution is disclosed, wherein:
the method comprises the following steps: two lasers with frequency difference of deltaf in the odd-even channel respectively generate optical frequency combs with interval of 2 deltaf through the optical frequency comb module, and then are interweaved together through the coupler to form a dense optical carrier with frequency interval of deltaf,
secondly, the dense light carriers form a plurality of subcarriers after passing through the beam splitter, the subcarriers are orthogonally multiplexed, and then the subcarriers in different modes are respectively subjected to multi-probability matching through multi-probability coding modulation, so that the subcarriers in different modes have different probability distributions;
thirdly, multiplexing the subcarriers, transmitting the multiplexed subcarriers to one of the 19-core 6-mode optical fibers through optical fiber fan-in equipment, modulating 18 pseudo-random binary signals with the same wavelength by using different binary sequences in different transmitters of the rest 18 cores, transmitting the 19 signals through the 19-core 6-mode optical fibers, and receiving and processing the 19 signals by a signal receiving device;
the specific method for multi-probability modulation of the multi-probability coded modulation to perform multi-probability matching on the subcarriers of different modes respectively comprises the following steps: probability shaping is carried out on the optical signals by adopting Maxwell-Boltzmann distribution, and the formula is as follows:
PX(xi) Representative point xiSize of probability of occurrence, xkRepresenting constellation points after QAM modulation;
and v is a scaling factor which represents the degree of probability shaping and is a value between 0 and 1, wherein the value of v of the high-order mode is larger than that of v of the basic mode.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the scaling factor v has a value in the range of 0-0.35.
The optical frequency comb module is an optical frequency comb based on a single-pump laser and a silicon-based integrated micro-ring resonator.
In the first step, one path of laser generates an optical frequency comb with the frequency interval of 25GHz through an optical frequency comb module, each subcarrier is separated by using an arbitrary waveform generator with the channel frequency interval of 25GHz, and an odd channel group of lambda 1, lambda 3 and lambda 5 is generated after modulation; also, a laser generates subcarriers with a frequency spacing of 25GHz, where the generated subcarriers are λ 2, λ 4 and λ 6, respectively, as even channel groups, and since the frequency spacing between the odd channel laser and the even channel laser is 12.5GHz, the odd and even channels are interleaved together by a 50:50 coupler to form a dense optical carrier with a frequency spacing of 12.5 GHz.
In step three, the subcarriers are divided into 6 ports, 6-mode signal streams are obtained through delay lines with different lengths, and the 6 signal streams are multiplexed through a photon lantern 6-mode multiplexer and transmitted into a 19-core 6-mode optical fiber through an optical fiber fan-in device.
In step three, the method for receiving and processing signals by the signal receiving device comprises: signals from 19-core 6-mode fibers are passed through a fan-out device and the 6-mode signals are decomposed by a mode demultiplexer. Then, through a coherent receiver, a 12 multiplied by 12MIMO equalizer is used, digital signal processing is carried out on the signals, and then probability de-matching is carried out on the signals; and then carrying out parallel-serial change and decoding to obtain received binary data, and finally carrying out error rate analysis on the received binary data to evaluate the performance of the system.
The signals of the 6 modes described above are all processed simultaneously by a 12 x 12MIMO equalizer with half symbol spacing, with the tap size set to 1000 to compensate for the frequency dependent differential mode delay and update the tap coefficients according to the least mean square algorithm.
The multi-probability coding modulation respectively performs Maxwell-Boltzmann distribution on subcarriers in different modes to perform probability shaping on optical signals, and the scaling factor v is adjusted, is one of key parameters of the Maxwell-Boltzmann distribution, can represent the degree of probability shaping, and takes values between 0 and 1. Probability shaping increases the probability of occurrence of signals with small amplitude, and decreases the probability of occurrence of signals with large amplitude, wherein the larger v represents the larger degree of probability shaping, and it is the difference of v that causes different probability distributions of probability shaping, and the different information entropies H. The invention adopts the signal with lower shaping degree of the optical transmission probability of the low-order mode and the signal with higher shaping degree of the optical transmission probability of the high-order mode, thereby reducing the high-order mode loss, effectively improving the noise resistance of the modulation format, improving the error rate performance of the system and saving the transmission power. At the same time, probability shaping provides unparalleled flexibility for optical communication systems without increasing the complexity of the system.
The multi-probability coded modulation is matched with a 19-core 6-mode optical fiber, the 19-core 6-mode optical fiber has a 6 mode, P bit transmission can be achieved, but the corresponding problem that the quality of an optical signal with high-order mode transmission is poor is solved.
Drawings
Fig. 1 is a block flow diagram of a high noise immunity P-bit optical transmission system based on a multi-probability distribution;
FIG. 2 is a structural view of a 19-core 6-mode optical fiber;
FIG. 3 is a block flow diagram of a portion of a multi-probability encoding;
fig. 4-9 are received constellations after passing through an additive white gaussian noise channel.
Detailed Description
Examples of the present invention are described in further detail below.
As shown in fig. 1, the scheme adopts a low-cost and high-energy-efficiency optical frequency comb based on a single-pump laser and a silicon-based integrated micro-ring resonator. The optical frequency comb based on the structure only needs a single III-V family direct current pump laser, the frequency interval of an output spectral line is determined by the effective refractive index and the geometric dimension of the resonator waveguide, the effective refractive index can be regulated and controlled through a temperature tuning technology to obtain accurate and stable wavelength, and the regulation and control consistency is high. Firstly, one path of laser generates an optical frequency comb with the frequency interval of 25GHz through an optical frequency comb module, then each subcarrier is separated by utilizing an AWG with the channel frequency interval of 25GHz, and an odd channel group of lambda 1, lambda 3 and lambda 5 is generated after modulation; a laser also generates subcarriers with a frequency spacing of 25GHz, where the generated subcarriers are λ 2, λ 4, λ 6 as even channel groups, respectively. But since the frequency separation between the odd channel laser and the even channel laser is 12.5GHz, interleaving the odd and even channels together through a 50:50 coupler will result in an optical signal with a frequency separation of 12.5 GHz. Forming a plurality of subcarriers after passing through a beam splitter, performing orthogonal multiplexing among the subcarriers, and respectively performing multi-probability matching on signals in different modes according to requirements, so that light in different modes has different probability distributions; the signal is then split into 6 ports and 6 modes of signal flow are obtained through delay lines of different lengths. Next, these 6 signals are multiplexed by a photonic lantern 6 mode multiplexer and launched into one of the cores by a fiber fan-in device, the six modes being LP01, LP11a, LP11b, LP21a, LP21b and LP02, respectively, the core-to-core crosstalk is less than 38dB, the insertion loss is less than 0.4dB, and the fiber architecture is as shown in fig. 2. Light of 6 modes is launched into one of the cores of a 19-core 6-mode fiber by a fiber bundle fan-in device. In the different transmitters of the remaining 18 cores, the 18 signals of the same wavelength are modulated by using different pseudo-random binary sequences. In our setup, the 6-mode multiplexed signal generated by the multiplexer is split into 6 ports by a few-mode power splitter and input into the cores adjacent to the core under test, each core also being decorrelated by a delay line. For other non-adjacent cores, a signal is sent out through the GI multimode fiber to excite all 6 modes at the input side of the MCF. The signal sent from the test core then passes through a fan-out device and the 6 modes are demultiplexed by a mode multiplexer. Then, the coherent receiver is used for 12 multiplied by 12MIMO processing, and digital signal processing such as channel equalization, dispersion compensation and the like is carried out on the coherent receiver, so that probability de-matching can be carried out on multiple probabilities according to system requirements; and then carrying out parallel-serial change and decoding to obtain received binary data, and finally carrying out error rate analysis on the received binary data to evaluate the performance of the system. In the present system, samples for all modes are processed simultaneously by a 12 × 12MIMO equalizer at half symbol intervals. The tap size is set to 1000 to compensate for the frequency dependent differential mode delay and update the tap coefficients according to a Least Mean Square (LMS) algorithm.
Since the high-order mode loss is higher than that of the fundamental mode, the mode coupling strength is higher, and the quality of an optical signal transmitted based on the high-order mode is poorer. Therefore, the probability shaping is carried out to a greater extent on the high-order mode, and the specific probability distribution uses Maxwell-Boltzmann distribution as shown in the following formula
Where v is a scaling factor, which is one of the key parameters, and may represent the degree of probability shaping, and is a value between 0 and 1. The larger v represents the larger degree of probability shaping, and it is the difference of v that causes the probability distribution of probability shaping to be different, and the information entropy H is different. Probability shaping increases the probability of the occurrence of small amplitude signals and decreases the probability of the occurrence of large amplitude signals, which results in a reduction of the average power of the signals and saves transmission power. At the same time, probability shaping provides unparalleled flexibility for optical communication systems without increasing the complexity of the system. A flow chart of multi-probability coding is shown in fig. 3.
Fig. 4-9 are diagrams illustrating constellations received after passing through an additive white gaussian noise channel, where fig. 4 is a constellation diagram of a 16QAM signal with an information entropy H of 3.7864 when the transmission mode is LP 01. The constellation of the P-bit transmission system using multi-probability mapping of the present patent is shown in fig. 5-9. Fig. 5 is a signal constellation diagram of information entropy H3.5611 when the transmission mode is LP11a, fig. 6 is a signal constellation diagram of information entropy H3.3061 when the transmission mode is LP11b, fig. 7 is a signal constellation diagram of scaling factor information entropy H3.0541 when the transmission mode is LP21a, fig. 8 is a signal constellation diagram of information entropy H2.8265 when the transmission mode is LP21a, and fig. 9 is a signal constellation diagram of H2.6335 when the transmission mode is LP21 a. It can be seen from fig. 4-9 that the high noise immunity P-bit optical transmission system based on multi-probability distribution proposed by the present patent is feasible.
The probability distribution of each constellation point under different scaling factors is as follows:
as can be seen from the probability distribution, when the scaling factor v is continuously increased, the larger the probability of the occurrence of the middle constellation point is, the smaller the probability of the occurrence of the constellation point farther from the center is.
By
It can be calculated that the average relative powers of H3.7864, H3.5611, H3.3061, H3.0541, H2.8265, and H2.6335 are 6.9604, 5.7036, 4.6877, 3.9072, 3.3308, and 2.9172, respectively, as can be seen from simulation data, the multi-probability mode multiplexing optical signal transmission method proposed in this patent can reduce the transmission power of the whole system, and the larger the scaling factor v, the smaller the average relative power. Meanwhile, the operation and maintenance cost of the system is reduced, and high spectral efficiency and high transmission capacity are obtained.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention. And (4) protecting the scope.
Claims (7)
1. A high noise-resistant P bit optical transmission method based on multi-probability distribution is characterized in that:
the method comprises the following steps: two lasers with frequency difference of deltaf in the odd-even channel respectively generate optical frequency combs with interval of 2 deltaf through the optical frequency comb module, and then are interweaved together through the coupler to form a dense optical carrier with frequency interval of deltaf,
secondly, the dense light carriers form a plurality of subcarriers after passing through the beam splitter, the subcarriers are orthogonally multiplexed, and then the subcarriers in different modes are respectively subjected to multi-probability matching through multi-probability coding modulation, so that the subcarriers in different modes have different probability distributions;
step three, after multiplexing the subcarriers, transmitting the multiplexed subcarriers to one core of a 19-core 6-mode optical fiber through fiber bundle fan-in equipment, modulating 18 pseudo signals with the same wavelength in different transmitters of the rest 18 cores by using different binary sequences, transmitting the 19 signals through the 19-core 6-mode optical fiber, and receiving and processing the 19 signals by a signal receiving device;
the specific method for multi-probability modulation of the multi-probability coded modulation to perform multi-probability matching on the subcarriers of different modes respectively comprises the following steps: probability shaping is carried out on the optical signals by adopting Maxwell-Boltzmann distribution, and the formula is as follows:
PX(xi) Representative point xiSize of probability of occurrence, xkRepresenting constellation points after QAM modulation;
and v is a scaling factor which represents the degree of probability shaping and is a value between 0 and 1, wherein the value of v of the high-order mode is larger than that of v of the basic mode.
2. The multi-probability distribution-based high noise immunity P-bit optical transmission method according to claim 1, wherein: the scaling factor v has a value in the range of 0-0.35.
3. The multi-probability distribution-based high noise immunity P-bit optical transmission method according to claim 1, wherein: the optical frequency comb module is an optical frequency comb based on a single-pump laser and a silicon-based integrated micro-ring resonator.
4. The multi-probability distribution-based high noise immunity P-bit optical transmission method according to claim 1, wherein: in the first step, one path of laser generates an optical frequency comb with the frequency interval of 25GHz through an optical frequency comb module, each subcarrier is separated by using an arbitrary waveform generator with the channel frequency interval of 25GHz, and an odd channel group of lambda 1, lambda 3 and lambda 5 is generated after modulation; also, a laser generates subcarriers with a frequency spacing of 25GHz, where the generated subcarriers are λ 2, λ 4 and λ 6, respectively, as even channel groups, and since the frequency spacing between the odd channel laser and the even channel laser is 12.5GHz, the odd and even channels are interleaved together by a 50:50 coupler to form a dense optical carrier with a frequency spacing of 12.5 GHz.
5. The multi-probability distribution based high noise immunity P-bit optical transmission method according to claim 1, wherein: in step three, the subcarriers are divided into 6 ports, 6-mode signal streams are obtained through delay lines of different lengths, and the 6 signal streams are multiplexed together by a 6-mode multimode multiplexer based on a photon lantern and fanned into a 19-core 6-mode optical fiber through an optical fiber fanin device.
6. The multi-probability distribution-based high noise immunity P-bit optical transmission method according to claim 1, wherein: in step three, the method for receiving and processing signals by the signal receiving device comprises: signals sent by the 19-core 6-mode optical fibers pass through fan-out equipment, and the signals of 6 modes are subjected to demultiplexing by a mode demultiplexer; then, through a coherent receiver, a 12 multiplied by 12MIMO equalizer is used, digital signal processing is carried out on the signals, and then probability de-matching is carried out on the signals; and then carrying out parallel-serial change and decoding to obtain received binary data, and finally carrying out error rate analysis on the received binary data to evaluate the performance of the system.
7. The multi-probability distribution-based high noise immunity P-bit optical transmission method according to claim 6, wherein: the signals of the 6 modes are all processed simultaneously by a 12 x 12MIMO equalizer with half symbol spacing, with the tap size set to 1000 to compensate for the frequency dependent differential mode delay and update the tap coefficients according to the least mean square algorithm.
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| CN112702067A (en) * | 2021-01-20 | 2021-04-23 | 太原师范学院 | All-optical parity checker based on micro-ring resonator thermal nonlinear effect |
| CN112671529B (en) * | 2021-03-15 | 2021-06-29 | 南京信息工程大学 | Few-mode P-bit high-safety transmission method based on constellation disturbance |
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