CN114665976A - Kramers-Kronig-based integrated self-coherent receiver signal processing method and system - Google Patents
Kramers-Kronig-based integrated self-coherent receiver signal processing method and system Download PDFInfo
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Abstract
The invention relates to the technical field of optical communication application, and discloses an integrated self-coherent receiver based on Kramers-Kronig and a signal processing method and a system, wherein a received optical signal and a strong direct current signal emitted by a narrow linewidth laser output two parallel polarized light beams through a polarization beam splitter respectively, an X polarized signal and a Y polarized signal, the signals in the same polarization direction are combined through polarization-maintaining optical fiber couplers respectively, the X polarized signal and the Y polarized signal output from the two polarization-maintaining optical fiber couplers are converted into two electric signals by corresponding photoelectric detectors respectively, the two electric signals filter out-of-band noise through electric filters respectively, and are finally transmitted to an integrated analog-to-digital converter respectively to obtain an up-sampling electric signal; the up-sampling electric signal is subjected to photoelectric front-end compensation, KK algorithm operation, dispersion compensation and symbol judgment in sequence to obtain the bit error rate of a transmission result of a measuring system; the method does not need to carry out connection, debugging and parameter setting of other components, is convenient to operate and has low power loss.
Description
Technical Field
The invention relates to the technical field of optical communication application, in particular to an integrated self-coherent receiver based on Kramers-Kronig and a signal processing method and system.
Background
The expansion of the link capacity of the data center prompts people to find a novel receiver structure, which can realize the spectrum efficiency and damage tolerance of standard coherent detection, and simultaneously has the simplicity of direct detection and low power consumption, when the transmitted signal meets the minimum phase condition, the Kramers-Kronig (KK) receiver can obtain the phase of the signal from the signal strength through the Hilbert relationship, namely, the dual-polarization high-speed signal can be reconstructed only through two detectors, with the continuous maturity of the KK receiving mechanism theory and the algorithm, more and more experimental results prove the practicability of the receiver in short distance, especially in medium and short distance, however, the devices and structures related to the receiving end of the communication system based on the KK (Kramers-Kronig) algorithm are mostly thousands of rules and large in volume, and when the receiver is applied to the medium and short distance optical fiber communication system, the information acquisition needs to be repeatedly plugged and replaced, the operation is repeated and cumbersome.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an integrated self-coherent receiver based on Kramers-Kronig, a signal processing method and a signal processing system.
In order to achieve the above purpose, the invention provides the following technical scheme:
a Kramers-Kronig based integrated auto-coherent receiver comprising the steps of:
the received optical signal and the strong direct current signal sent by the narrow linewidth laser output two parallel polarized lights through a polarization beam splitter respectively, the X polarized signal and the Y polarized signal, the signals in the same polarization direction form a combined beam through a polarization maintaining optical fiber coupler respectively, the X polarized signal and the Y polarized signal output from the two polarization maintaining optical fiber couplers are converted into two electric signals by corresponding photoelectric detectors respectively, the two electric signals filter out-of-band noise through an electric filter respectively, and finally are transmitted to an integrated analog-to-digital converter respectively to obtain an up-sampling electric signal;
the up-sampling electric signal is subjected to photoelectric front-end compensation, KK algorithm operation, dispersion compensation and symbol judgment in sequence to obtain the bit error rate of a transmission result of the measurement system.
In the present invention, it is preferable to control the center frequency and output power of the tunable narrow linewidth laser with the minimum phase relationship to be satisfied, knowing the modulation format and signal rate of the received optical signal, to ensure that the signal arriving at the photodetector satisfies the minimum phase condition.
In the invention, preferably, the photodetector adopts a high-speed PIN type photodetector with a 3dB bandwidth of 50GHz, so as to be better suitable for a high-speed medium-short distance communication system.
In the present invention, preferably, the electrical filter is a software-controllable electrical filter to filter out-of-band noise of signals with different rates, so as to better recover the received electrical signals.
In the invention, preferably, the integrated analog-to-digital converter adopts a precise analog-to-digital converter with a sampling rate capable of being controlled by software, and the sampling rate of the precise analog-to-digital converter is set according to requirements, so that the adaptability is improved.
In the present invention, preferably, when performing high-power sampling, the subsequent KK algorithm recovers the full-field information and then performs down-sampling to twice, so as to reduce the number of taps and improve the operation efficiency of the algorithm.
In the present invention, it is preferable that after the photoelectric front end compensation, the phase information is restored by hilbert transform to obtain all the information.
In the present invention, preferably, the signal after dispersion compensation is equalized by the adaptive equalizer after dispersion compensation to compensate channel distortion, and finally symbol decision is made to obtain the bit error rate capable of measuring the system transmission result.
An integrated self-coherent receiver signal processing system based on Kramers-Kronig, comprising an integrated self-coherent receiver and a processor connected together, the integrated self-coherent receiver comprising a first polarization beam splitter, a second polarization beam splitter, a narrow linewidth laser, a first polarization maintaining fiber coupler, a second polarization maintaining fiber coupler, a first photodetector, a second photodetector, a first electrical filter, a second electrical filter, and a first analog-to-digital converter and a second analog-to-digital converter;
the first polarization beam splitter receives an input optical signal and outputs two parallel polarized light beams, one beam is input into the first polarization-maintaining optical fiber coupler, the other beam is input into the second polarization-maintaining optical fiber coupler,
the narrow linewidth laser emits strong direct current light signal and inputs the strong direct current light signal to the second polarization beam splitter, the second polarization beam splitter divides the direct current light signal into two parallel polarized light input, one is input to the first polarization maintaining optical fiber coupler, the other is input to the second polarization maintaining optical fiber coupler,
the first polarization maintaining optical fiber coupler and the second polarization maintaining optical fiber coupler respectively combine input signals in the same polarization direction, and the combined polarization signals are respectively transmitted to the first photoelectric detector and the second photoelectric detector;
the first photoelectric detector and the second photoelectric detector respectively convert the received polarization signals into electric signals and transmit the electric signals to the first electric filter and the second electric filter;
the first electric filter and the second electric filter respectively filter out-of-band noise of the input electric signals and then transmit the electric signals to the first analog-to-digital converter and the second analog-to-digital converter, and the first analog-to-digital converter and the second analog-to-digital converter convert the received electric signals into digital signals to output.
In the present invention, it is preferable that the output parameter of the narrow linewidth laser satisfies the minimum phase condition of KK.
Compared with the prior art, the invention has the beneficial effects that:
the method can realize the electric signal acquisition of the receiving end of the dual-polarization high-speed optical communication system by utilizing the passive device and the integratable photoelectric device on the basis that the related parameters of the tunable laser and the analog-to-digital converter meet the minimum phase signal condition, finishes signal sampling integrally according to the integrated autocorrelator, does not need to carry out connection, debugging and parameter setting of other parts, is convenient to operate and low in power consumption, and obtains the error rate or Q value of the system transmission result after the acquired up-sampled electric signal is sequentially subjected to photoelectric front-end compensation, KK algorithm operation, dispersion compensation and symbol judgment.
Drawings
Fig. 1 is a schematic diagram of an up-sampling signal flow of a Kramers-Kronig-based integrated autocorrelation receiver signal processing method.
Fig. 2 is a simplified overall flow diagram of a Kramers-Kronig-based integrated autocorrelation receiver signal processing method.
Fig. 3 is a block diagram of a Kramers-Kronig-based integrated self-coherent receiver signal processing system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, a preferred embodiment of the present invention provides a signal processing method for a Kramers-Kronig-based integrated self-coherent receiver, which is implemented by using a passive device and an integratable optoelectronic device on the basis that relevant parameters of a tunable laser and an analog-to-digital converter are controlled to satisfy a minimum phase signal condition, so as to acquire electrical signals at a receiving end of a dual-polarization high-speed optical communication system, and then the ADC samples the electrical signals, so as to recover full field information by using a subsequent KK algorithm and a DSP algorithm, wherein the method comprises outputting two parallel polarized lights through a polarization beam splitter for a received optical signal and a strong current signal emitted by a narrow-linewidth laser, combining the X-polarized signal and a Y-polarized signal by using a polarization-maintaining optical fiber coupler for signals in the same polarization direction, and converting the X-polarized signal and the Y-polarized signal output from the two polarization-maintaining optical fiber couplers into two electrical signals by corresponding photodetectors, the two electric signals are respectively filtered out of band noise by an electric filter, and finally are respectively transmitted to an integrated analog-to-digital converter to obtain an up-sampling electric signal; the up-sampling electric signal is subjected to photoelectric front-end compensation, KK algorithm operation, dispersion compensation and symbol judgment in sequence to obtain the bit error rate of the transmission result of the measurement system.
Specifically, an optical signal transmitted by the system and reaching the receiver is input, under the condition of knowing a modulation format and a signal rate of a received optical signal, the central frequency and the output power of the tunable narrow linewidth laser are controlled by utilizing a minimum phase relation to be met to ensure that the signal reaching the photoelectric detector meets a minimum phase condition, namely, a higher carrier-signal power ratio and a signal are single-sideband signals, the received optical signal is converted into two parallel X-polarization signals and two parallel Y-polarization signals through the beam splitting of one polarization beam splitter, simultaneously a strong direct current signal is converted into the two parallel X-polarization signals and the two parallel Y-polarization signals through the beam splitting of the other polarization beam splitter, the two X-polarization signals output by the two polarization beam splitters are input to the same polarization maintaining optical fiber coupler to complete beam combination, and the two Y-polarization signals complete beam combination through the other polarization maintaining optical fiber coupler, the combined X polarization signal and Y polarization signal are converted into two electrical signals through a photoelectric detector respectively, the two electrical signals are filtered out of band noise through an electrical filter respectively, and finally the two electrical signals are transmitted to an integrated analog-to-digital converter respectively to obtain up-sampling electrical signals; the acquisition of the whole up-sampled electrical signal can be completed through the receiver, other parts do not need to be installed and adjusted, the parameters are set, the operation is convenient, the power loss is low, the up-sampled electrical signal after being collected sequentially passes through the photoelectric front-end compensation, the KK algorithm operation, the dispersion compensation and the symbol judgment, the error rate or the Q value of the transmission result of the system can be obtained, the practicability is high, and the up-sampled electrical signal acquisition device is suitable for medium-short distance optical fiber communication systems.
In the embodiment, the photodetector adopts a high-speed PIN type photodetector with a 3dB bandwidth of 50GHz, so as to be better suitable for a high-speed medium-short distance communication system.
In this embodiment, the electrical filter is a software-controllable electrical filter to filter out-of-band noise of signals with different rates, so as to better recover the received electrical signal.
In the embodiment, because the KK algorithm has exponential and logarithmic operations and causes certain broadening to signals, whether up-sampling of 3-4 times baud rate needs to be executed according to customer requirements or not is judged before the KK algorithm is carried out, and when high-time sampling is executed, the down-sampling is carried out to two times after the subsequent KK algorithm recovers full-field information, so that the number of taps is reduced, and the operating efficiency of the algorithm is improved.
In the embodiment, for the improved KK algorithm, the full field information of the signal can be recovered by the up-sampling with double baud rate, so that the integrated analog-to-digital converter adopts a precise analog-to-digital converter with a sampling rate controlled by software, and the sampling rate of the precise analog-to-digital converter can be set according to requirements, so that high-power sampling and low-power sampling can be performed, the overall adaptability of the method is strong, the phase information of the amplitude signal can be recovered by the double sampling rate, that is, the signal rate of a transmitting end can be doubled, and the requirement on the capacity of a communication system can be better met.
In the present embodiment, after receiving the up-sampled signal, the phase information is restored by hilbert transform after performing photoelectric front-end compensation, and all the information is obtained.
In the embodiment, after dispersion compensation, the signal after dispersion compensation is equalized by the adaptive equalizer to compensate channel distortion, and finally symbol decision is made to obtain the bit error rate capable of measuring the system transmission result.
Referring to fig. 3, another preferred embodiment of the present invention provides a signal processing system of an integrated self-coherent receiver based on Kramers-Kronig, which has a small size and avoids various device connections and complicated parameter setting operations in each experiment by integrating passive devices and electro-optical devices and controlling a laser and an analog-to-digital converter therein through software, and the integrated self-coherent receiver comprises an integrated self-coherent receiver and a processor connected together, wherein the integrated self-coherent receiver comprises a first polarization beam splitter, a second polarization beam splitter, a narrow line width laser, a first polarization maintaining fiber coupler, a second polarization maintaining fiber coupler, a first photodetector, a second photodetector, a first electrical filter, a second electrical filter, a first analog-to-digital converter and a second analog-to-digital converter;
the first polarization beam splitter receives an input optical signal and outputs two beams of parallel polarized light, one beam of parallel polarized light is input into the first polarization maintaining optical fiber coupler, the other beam of parallel polarized light is input into the second polarization maintaining optical fiber coupler,
the narrow linewidth laser emits strong direct current light signal and inputs the strong direct current light signal to the second polarization beam splitter, the second polarization beam splitter divides the direct current light signal into two parallel polarized light input, one is input to the first polarization maintaining optical fiber coupler, the other is input to the second polarization maintaining optical fiber coupler,
the first polarization maintaining optical fiber coupler and the second polarization maintaining optical fiber coupler respectively combine input signals in the same polarization direction, and the combined polarization signals are respectively transmitted to the first photoelectric detector and the second photoelectric detector;
the first photoelectric detector and the second photoelectric detector respectively convert the received polarization signals into electric signals and transmit the electric signals to the first electric filter and the second electric filter;
the first electric filter and the second electric filter respectively filter out-of-band noise of the input electric signals and then transmit the electric signals to the first analog-to-digital converter and the second analog-to-digital converter, and the first analog-to-digital converter and the second analog-to-digital converter convert the received electric signals into digital signals to output.
In the present embodiment, the output parameter of the narrow linewidth laser satisfies the minimum phase condition of KK.
Specifically, the core of the application of the KK-based self-coherent receiver in a practical transmission system is to satisfy the minimum phase condition: firstly, a single-sideband signal and secondly, a high-power accompanied carrier signal are added, based on the condition, the phase of an optical field incident to a photoelectric detector can be recovered from the intensity of the optical field through the Kramers-Kronig relation, assuming that a signal reaching a receiver is s (t), in order to meet the minimum phase signal condition, the output power of a laser is controlled to be far higher than the power of s (t) through software, the central frequency of the power is superposed with the left edge of an information bearing signal frequency spectrum, experimentally, the ratio of loss carrier to signal power of a system and a device is generally controlled to be 7-10dB, specific numerical values can automatically set relevant parameters according to different experimental requirements, on the basis of meeting the minimum phase condition based on KK, after the output parameters of the laser are set through software according to different requirements of an experimenter, the optical signal and the strong current signal respectively pass through a first polarization beam splitter, The second polarization beam splitter splits the beams and the first polarization maintaining optical fiber coupler and the second polarization maintaining optical fiber coupler combine the beams of the signals with different polarization directions to reach the ends of the first photoelectric detector and the second photoelectric detector, wherein in order to be better applied to a future high-speed medium-short distance communication system, the 3dB bandwidth of the selected photoelectric detector is 50GHz, so that the photoelectric detector can be applied to a high-speed transmission system; the signal of telecommunication after the conversion carries out the filtering of outband noise to the signal of different rates through first electric filter, second electric filter to resume received signal of telecommunication better, the signal of telecommunication after the recovery is converted into digital signal through first analog to digital converter and second analog to digital converter and is exported for the treater, and the treater mainly adopts current computer etc. and inside sets up by KK algorithm, signal processing module, so that follow-up carries out digital signal processing.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A Kramers-Kronig-based integrated self-coherent receiver signal processing method is characterized by comprising the following steps:
the received optical signal and the strong direct current signal emitted by the narrow linewidth laser output two parallel polarized lights respectively through a polarization beam splitter, an X polarized signal and a Y polarized signal, the signals in the same polarization direction respectively complete beam combination through a polarization maintaining optical fiber coupler, the X polarized signal and the Y polarized signal respectively output from the two polarization maintaining optical fiber couplers are respectively converted into two electric signals by corresponding photoelectric detectors, the two electric signals respectively filter out-of-band noise through an electric filter, and finally are respectively transmitted to an integrated analog-to-digital converter to obtain an up-sampling electric signal;
the up-sampling electric signal is subjected to photoelectric front-end compensation, KK algorithm operation, dispersion compensation and symbol judgment in sequence to obtain the bit error rate of the transmission result of the measurement system.
2. A Kramers-Kronig based integrated auto-coherent receiver signal processing method as claimed in claim 1, characterized in that the center frequency and output power of the tunable narrow linewidth laser are controlled with the minimum phase relationship to be met, given the modulation format and signal rate of the received optical signal, to ensure that the signal reaching the photodetector meets the minimum phase condition.
3. The method as claimed in claim 1, wherein the photodetector is a high-speed PIN photodetector with 3dB bandwidth of 50GHz, so as to be better suitable for high-speed medium-short distance communication system.
4. The method as claimed in claim 1, wherein the electrical filter is a software-controllable electrical filter to filter out-of-band noise of signals with different rates, so as to better recover the received electrical signals.
5. The method as claimed in claim 1, wherein the integrated adc employs a precision adc with a sampling rate controllable by software, and the sampling rate of the precision adc is set according to the requirement, so as to increase the adaptability.
6. The method of claim 1, wherein when performing high-power sampling, the subsequent KK algorithm recovers full field information and then down-samples the full field information to twice, thereby reducing the number of taps and increasing the operating efficiency of the algorithm.
7. The method as claimed in claim 1, wherein the integrated self-coherent receiver signal processing method based on Kramers-Kronig is characterized in that after performing the electro-optical front-end compensation, the phase information is recovered by using hilbert transform to obtain all information.
8. The method as claimed in claim 1, wherein the dispersion-compensated signal is equalized by an adaptive equalizer to compensate for channel distortion, and finally symbol decision is made to obtain the bit error rate which can measure the transmission result of the system.
9. A Kramers-Kronig-based integrated self-coherent receiver signal processing system, comprising a Kramers-Kronig-based integrated self-coherent receiver and a processor according to any one of claims 1-8, the integrated self-coherent receiver comprising a first polarization beam splitter, a second polarization beam splitter, a narrow linewidth laser, a first polarization-preserving fiber coupler, a second polarization-preserving fiber coupler, a first photodetector, a second photodetector, a first electrical filter, a second electrical filter, and a first analog-to-digital converter and a second analog-to-digital converter, connected together;
the first polarization beam splitter receives an input optical signal and outputs two parallel polarized light beams, one beam is input into the first polarization-maintaining optical fiber coupler, the other beam is input into the second polarization-maintaining optical fiber coupler,
the narrow linewidth laser emits strong direct current light signal and inputs the strong direct current light signal to the second polarization beam splitter, the second polarization beam splitter divides the direct current light signal into two parallel polarized light input, one is input to the first polarization maintaining optical fiber coupler, the other is input to the second polarization maintaining optical fiber coupler,
the first polarization maintaining optical fiber coupler and the second polarization maintaining optical fiber coupler respectively combine input signals in the same polarization direction, and the combined polarization signals are respectively transmitted to the first photoelectric detector and the second photoelectric detector;
the first photoelectric detector and the second photoelectric detector respectively convert the received polarization signals into electric signals and transmit the electric signals to the first electric filter and the second electric filter;
the first electric filter and the second electric filter respectively filter out-of-band noise of the input electric signal and then transmit the electric signal to the first analog-to-digital converter and the second analog-to-digital converter, and the first analog-to-digital converter and the second analog-to-digital converter convert the received electric signal into a digital signal to be output.
10. The Kramers-Kronig-based integrated auto-coherent receiver signal processing system of claim 9, wherein the narrow linewidth laser output parameter satisfies a minimum phase condition of KK.
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| CN115913387A (en) * | 2022-11-30 | 2023-04-04 | 天津大学 | High-efficiency self-coherent receiving method based on space division multiplexing system |
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