WO2017004829A1 - Procédé pour recevoir et émettre un signal, émetteur, récepteur et système de réseau optique - Google Patents

Procédé pour recevoir et émettre un signal, émetteur, récepteur et système de réseau optique Download PDF

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Publication number
WO2017004829A1
WO2017004829A1 PCT/CN2015/083655 CN2015083655W WO2017004829A1 WO 2017004829 A1 WO2017004829 A1 WO 2017004829A1 CN 2015083655 W CN2015083655 W CN 2015083655W WO 2017004829 A1 WO2017004829 A1 WO 2017004829A1
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Prior art keywords
signal
level
amplitude
optical
decision
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Ceased
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PCT/CN2015/083655
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English (en)
Chinese (zh)
Inventor
左天健
张亮
周恩波
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/083655 priority Critical patent/WO2017004829A1/fr
Priority to CN201580081335.3A priority patent/CN107852247B/zh
Publication of WO2017004829A1 publication Critical patent/WO2017004829A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse modulation

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for transmitting and receiving signals, a transmitter, a receiver, and an optical network system.
  • Pulse Amplitude Modulation is a modulation method in which the amplitude of a pulse carrier varies with the baseband signal. Compared with multi-carrier modulation, PAM modulation has inherent advantages such as low power consumption and easy interconnection.
  • IMDD Intensity Modulation and Direct Detection
  • CSPR carrier to signal power ratio
  • PAM modulation multi-level general modulation at the quadrature point (quad point)
  • the modulator's bias voltage is set to 2Vpi * N + Vpi / 2
  • N is an integer
  • Vpi is The inherent parameters of the modulator, at this time, the carrier is also the power of the DC light at more than half of the total power, and the actual signal power accounts for more than 1/2 of the total power, resulting in a relatively high CSPR, affecting system performance.
  • the embodiment of the invention provides a method for transmitting and receiving signals, a transmitter, a receiver and an optical network system, which reduces the carrier signal power ratio CSPR when transmitting signals, and improves system performance.
  • a first aspect of the embodiments of the present invention provides a method for sending a signal, including:
  • N is a positive integer.
  • the first signal and the second signal are AC-coupled non-return-to-zero signals.
  • the M 2.
  • a second aspect of the embodiments of the present invention provides a method for receiving a signal, including:
  • the sampling the optical signal to obtain a sampling signal includes:
  • N is a non-negative integer
  • Tb is a symbol period
  • T0 is the first amplitude maximum in the eye diagram of the optical signal. The moment when the intersection of the second amplitude maximum occurs;
  • the multi-level decision on the sampling signal to obtain amplitude information at each sampling point time includes:
  • searching for the preset amplitude correspondence table to obtain the target signal includes:
  • the preset amplitude correspondence table is an amplitude of a target signal of a previous level time
  • Performing multi-level decision on the third signal to obtain a fifth signal including:
  • Performing multi-level decision on the fourth signal to obtain a sixth signal including:
  • a four-level decision is made on the fourth signal to obtain a four-level sixth signal.
  • Performing multi-level decision on the third signal to obtain a fifth signal including:
  • Performing multi-level decision on the fourth signal to obtain a sixth signal including:
  • An eight-level decision is made on the fourth signal to obtain an eight-level sixth signal.
  • Performing multi-level decision on the third signal to obtain a fifth signal including:
  • Performing multi-level decision on the fourth signal to obtain a sixth signal including:
  • a sixteen-level decision is made on the fourth signal to obtain a sixteen-level sixth signal.
  • a third aspect of the embodiments of the present invention provides a transmitter, including:
  • An encoder configured to receive the first signal and the second signal, and perform amplitude modulation on the first signal and the second signal to output a third signal, where the first signal and the second signal are M-level signals,
  • the third signal is a 2M level signal, where M is a positive integer;
  • the difference between the voltages corresponding to the minimum output power, N is a positive integer.
  • the first signal and the second signal are AC-coupled non-return-to-zero signals.
  • the M 2.
  • a fourth aspect of the embodiments of the present invention provides a receiver, including:
  • a receiver configured to receive an optical signal transmitted by the transmitting end
  • a processor configured to sample the optical signal to obtain a sampling signal, perform multi-level determination on the sampling signal, obtain amplitude information at each sampling point moment, and search for a preset according to the amplitude information of each sampling point moment
  • the amplitude correspondence table obtains the target signal
  • a decoder configured to decode the target signal to obtain a first signal and a second signal.
  • the processor is further configured to perform multi-level decision on the third signal to obtain a fifth signal, and perform multi-level decision on the fourth signal to obtain a sixth signal;
  • the processor is further configured to: according to the amplitude information of each of the fifth signal and the sixth signal, search for a preset amplitude correspondence table to obtain the target signal, where the preset amplitude correspondence table is the previous one.
  • the processor is specifically configured to perform a two-level decision on the third signal to obtain a two-level fifth signal, and perform a four-level decision on the fourth signal to obtain a four-level sixth signal.
  • the processor is specifically configured to perform a four-level decision on the third signal to obtain a four-level fifth signal, and perform an eight-level decision on the fourth signal to obtain an eight-level sixth signal.
  • the processor is specifically configured to perform an eight-level decision on the third signal, obtain an eight-level fifth signal, and perform a six-level decision on the fourth signal to obtain a sixteen-level sixth signal.
  • a fourth aspect of the embodiments of the present invention provides an optical network system, including the transmitter of any of the third aspects, and the receiver of any of the fourth aspects.
  • the optical signal output after modulation is an AC coupled signal
  • the AC coupled signal is not There is DC
  • the DC of the light is the optical carrier. Since there is no carrier, that is, the carrier power is 0.
  • the power of the signal itself becomes larger, and the carrier signal power ratio CSPR is lowered, which improves the system performance.
  • FIG. 1 is a schematic diagram of an embodiment of a method for transmitting a signal according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an embodiment of a method for receiving a signal according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of another embodiment of a method for receiving a signal according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of PAM4 modulation and a spectrum and an eye diagram of a modulated signal in an embodiment of the present invention
  • FIG. 5 is a schematic diagram of an embodiment of a transmitter in an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of an embodiment of a receiver in an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an embodiment of an optical network system in an embodiment of the present invention.
  • the embodiment of the invention provides a method for transmitting and receiving signals, a transmitter, a receiver and an optical network system, which reduces the carrier signal power ratio CSPR and improves system performance.
  • MZM modulator for short
  • the input light passes through the Y branch and is split into two equal signals into the two optical branches of the modulator (both arms: upper arm and lower arm).
  • the materials used in the two optical branches are electro-optic materials, and their refractive indices follow
  • the externally applied electrical signal varies in size. Since the refractive index change of the optical branch causes a change in the phase of the signal, when the output of the two branch signal modulators are combined again, the synthesized optical signal will be a change in intensity.
  • the interference signal is equivalent to converting the change of the electrical signal into a change of the optical signal, and realizing the modulation of the light intensity.
  • the modulator can realize the modulation of different sidebands by controlling the bias voltage.
  • Eye diagram An eye diagram is a graph of a series of digital signals accumulated on an oscilloscope. It contains a wealth of information. From the eye diagram, the effects of crosstalk and noise between codes can be observed, reflecting the overall characteristics of the digital signal. Estimating the system's pros and cons, the eye diagram analysis is the core of the signal integrity analysis of the high-speed interconnect system. In addition, this graph can also be used to adjust the characteristics of the receive filter to reduce crosstalk between codes and improve the transmission performance of the system.
  • the carrier to signal power ratio (CSPR) is equal to the carrier power divided by the total signal power.
  • Multi-level decision that is, setting a plurality of thresholds, and performing multi-level decision on the level of the signal.
  • the two-level decision is to set a threshold and then compare whether the received signal is larger than the threshold or the threshold is small, for example, the threshold is 0.5.
  • V that is greater than 0.5V is 1, and less than 0.5V are 0.
  • there are three thresholds 0.5V, 1.5V, 2.5V, less than 0.5V are 0 It is 1 between 0.5V and 1.5V, 2 between 1.5V and 2.5V, and 3 above 2.5V.
  • Non-return to zero signal Non-Return to Zero, referred to as NRZ, the simplest and most common method for transmitting digital signals is to represent two binary digits with different voltage levels, that is, the digital signal consists of rectangular pulses. According to the digital coding method, it can be divided into a unipolar code and a bipolar code. The unipolar code uses positive (or negative) voltage to represent data; the bipolar code is binary code, 1 is inverted, and 0 is kept zero. Level. According to whether the signal returns to zero, it can also be divided into a return-to-zero signal and a signal.
  • the signal in the middle of the return-to-zero signal symbol returns to a zero level, for example, "1" is a positive level, and "0" is a negative level, and each data represents After the completion, it will return to the zero level state, and the return-to-zero signal does not return to the zero level process, for example, "1" is high level and "0" is low level.
  • the NRZ signal is the most common signal that propagates on electricity. NRZ is the original signal that needs to be transmitted. It can be broadband data, digital video, or digital voice signal.
  • the invention provides a method for transmitting and receiving signals, a transmitter, a receiver and an optical network system, which are applied to An IMDD system, in an optical network system according to an embodiment of the present invention, at a signal transmitting end, a transmitter obtains a third signal by modulating an input first signal and a second signal, and modulates a third signal through a modulator. The output is an optical signal.
  • the optical signal is transmitted from the transmitting end to the receiving end. Since the modulation bias voltage of the modulator is set to 2Vpi*N, the optical signal obtained after modulation becomes an AC-coupled signal. Since the AC-coupled signal is DC-free, the light is DC. It is the optical carrier. Since there is no carrier, that is, the carrier power is 0. At this time, the power of the signal itself becomes larger, and the carrier signal power ratio CSPR is lowered.
  • An embodiment of a method for transmitting a signal provided in the embodiment of the present invention is first described.
  • the method is applied to a signal transmitting end.
  • the method for transmitting a signal in the embodiment of the present invention is a transmitter.
  • an embodiment of a method for transmitting a signal in an embodiment of the present invention includes:
  • the first signal and the second signal are M level signals, and the third signal is a 2M level signal, where M is a positive integer, and the first signal and the second signal may be NRZ signals, or It is another modulated signal, which is not limited here;
  • Vpi is equal to a difference between a voltage corresponding to a maximum output power of the modulator and a voltage corresponding to a minimum output power
  • N is a positive integer
  • the optical signal output after modulation is an AC coupled signal, since the AC coupled signal is not DC.
  • the direct current of the light is the optical carrier. Since there is no carrier, that is, the carrier power is 0. At this time, the power of the signal itself becomes larger, and the carrier signal power ratio CSPR is lowered, thereby improving the system performance.
  • the first signal and the second signal are AC-coupled non-return-to-zero signals.
  • an embodiment of a method for receiving a signal in an embodiment of the present invention includes:
  • the optical signal may be an optical signal transmitted in a method of transmitting a signal as described in the above embodiments;
  • the first signal and the second signal originally transmitted by the signal transmitting end are obtained by performing sampling, multi-level decision, and table look-up recovery on the received optical signal to obtain a target signal before modulation.
  • another embodiment of a method for receiving a signal in an embodiment of the present invention includes:
  • the optical signal may be an optical signal transmitted in a method of transmitting a signal as described in the above embodiments;
  • the optical signal is sampled at a time T1 to obtain a third signal, and the optical signal is sampled at a time T2 to obtain a fourth signal.
  • N is a non-negative integer
  • Tb is a symbol period
  • T0 is the first amplitude maximum in the eye diagram of the optical signal. The moment when the intersection of the second amplitude maximum occurs;
  • the receiver has a clock recovery function, and can determine the time T0 at which the intersection between the time of the first amplitude maximum and the time of the second amplitude maximum in the eye diagram of the optical signal occurs, then T1, T2 That is, it can be determined according to the above formula according to T0.
  • the multi-level decision is performed on the third signal to obtain a fifth signal, including: performing two-level determination on the third signal to obtain a two-level And performing a multi-level decision on the fourth signal to obtain a sixth signal, comprising: performing four-level decision on the fourth signal to obtain a four-level sixth signal.
  • the multi-level decision is performed on the third signal to obtain a fifth signal, including: performing four-level determination on the third signal to obtain a four-level And performing a multi-level decision on the fourth signal to obtain a sixth signal, comprising: performing an eight-level decision on the fourth signal to obtain an eight-level sixth signal.
  • the multi-level decision is performed on the third signal to obtain a fifth signal, including: performing an eight-level decision on the third signal to obtain an eight-level And performing a multi-level decision on the fourth signal to obtain a sixth signal, comprising: performing a sixteen-level decision on the fourth signal to obtain a sixteen-level sixth signal.
  • the two-level decision is to set a threshold and then compare whether the received signal is larger than the threshold or the threshold is small, for example, the threshold is 0.5V, that is greater than 0.5V is 1, and less than 0.5V are 0;
  • four-level decision set with three thresholds, 0.5V, 1.5V, 2.5V, less than 0.5V are 0, between 0.5V and 1.5V are 1, at 1.5V and 2.5V Both are 2, 3 is above 2.5V, and so on, the eight-level decision will set eight thresholds for eight-level decision.
  • the preset table corresponding to the amplitude level of the amplitude on a target timing signal c k-1, a fifth current signal amplitude b k, a current amplitude of the sixth signal a k, a target current amplitude signal c k
  • k which is a positive integer, k is greater than 1
  • the amplitude initial value C 1 of the target signal is an initial value agreed by the transmitter and the receiver, that is, both the transmitter and the receiver are known.
  • the preset amplitude corresponds to the amplitude correspondence in the table, which may be as follows:
  • Table 1 above shows that by knowing the amplitude at a target level of timing signal c k-1, a fifth current signal amplitude b k, a current amplitude of the sixth signal a k, c k to determine the magnitude of the current target signal .
  • the target signal before modulation is obtained by sampling, multi-level decision, and table look-up of the received optical signal of the received transmitter, and decoding the target signal to obtain the original transmission of the signal transmitting end.
  • the modulation bias voltage is 2Vpi*N, as shown in FIG.
  • the curve of the first lower and the upper is the power modulation curve of the modulator
  • the curve of the first up and the bottom is the light field modulation curve of the modulator, wherein the starting position of the black arrow is null.
  • Point, that is, the point of the modulated bias voltage V 2Vpi*N
  • the right side of Figure 4 is the eye diagram and spectrum of the PAM4 signal after modulation.
  • the black peak in the middle is DC, and the eye diagram can be seen.
  • each cycle becomes two levels of one eye (the position where b k appears), and b k is the signal after the input of the 4-level signal c k is mixed, and the intersection point changes in each cycle. It becomes a 4-level, that is, the position where a k appears. Therefore, according to the above characteristics of the modulated optical signal, the signal receiving end (receiver) can take a corresponding manner to recover the electrical signal before modulation of the modulator, by using the electrical signal. The signal is decoded to obtain the NRZ signal.
  • the transmitter may also establish a correspondence between the amplitude of the target signal at the last level, the amplitude of the current fifth signal, the amplitude of the current sixth signal, and the amplitude of the current target signal. Relational tables.
  • an embodiment of a transmitter provided in the embodiment of the present invention is applied to a signal transmitting end.
  • an embodiment of the transmitter 500 in the embodiment of the present invention includes:
  • the encoder 501 is configured to receive the first signal and the second signal, and perform pulse width modulation on the first signal and the second signal to output a third signal, where the first signal and the second signal are M-level signals.
  • the third signal is a 2M level signal, where M is a positive integer;
  • the difference between the voltage and the voltage corresponding to the minimum output power, N is a positive integer.
  • the first signal and the second signal are AC-coupled non-return-to-zero signals.
  • the M 2.
  • the modulator is an MZM modulator.
  • the modulation bias voltage of the modulator 502 is set to 2 Vpi*N, and the obtained optical signal is an AC-coupled signal. Since there is no carrier, that is, the carrier power is 0, the CSPR of the modulated optical signal is lowered.
  • an embodiment of the receiver 600 in the embodiment of the present invention includes:
  • a receiver 601 configured to receive an optical signal transmitted by the transmitting end
  • the processor 602 is configured to sample the optical signal to obtain a sampling signal, perform multi-level determination on the sampling signal, obtain amplitude information at each sampling point time, and search for a pre-preparation according to the amplitude information of each sampling point moment. Set the amplitude correspondence table to obtain the target signal;
  • the decoder 603 is configured to decode the target signal to obtain a first signal and a second signal.
  • the processor 602 obtains a target signal before modulation by sampling, multi-level decision, and table lookup of the optical signal obtained by the transmitter received by the receiver 601, and the decoder 603 decodes the target signal.
  • the M-level first signal and the second signal originally transmitted by the signal transmitting end can be obtained.
  • the receiver has a clock recovery function capable of determining the time T0 at which the intersection between the time of the first amplitude maximum and the time of the second amplitude maximum in the eye diagram of the optical signal occurs, then T1 and T2 may be based on T0. According to the above formula, determining the maximum value of the amplitude in the eye diagram according to the clock recovery function is prior art, and will not be described in detail herein.
  • the processor 602 is further configured to perform multi-level decision on the third signal, obtain a fifth signal, and perform multi-level decision on the fourth signal to obtain a sixth signal;
  • the processor 602 is further configured to: according to the amplitude information of each of the fifth signal and the sixth signal, search for a preset amplitude correspondence table to obtain the target signal, where the preset amplitude correspondence table is A table of correspondence between the amplitude of the target signal at a level, the amplitude of the current fifth signal, the amplitude of the current sixth signal, and the amplitude of the current target signal.
  • the processor 602 is specifically configured to perform a two-level decision on the third signal, obtain a two-level fifth signal, and perform four-level determination on the fourth signal to obtain a four-level Six signals.
  • the processor 602 is specifically configured to perform four-level determination on the third signal, obtain a fourth-level fifth signal, and perform an eight-level decision on the fourth signal to obtain an eight-level Six signals.
  • the processor 602 is specifically configured to perform an eight-level decision on the third signal, obtain an eight-level fifth signal, and perform a six-level decision on the fourth signal to obtain sixteen-level signals.
  • Flat sixth signal is specifically configured to perform an eight-level decision on the third signal, obtain an eight-level fifth signal, and perform a six-level decision on the fourth signal to obtain sixteen-level signals.
  • Flat sixth signal is specifically configured to perform an eight-level decision on the third signal, obtain an eight-level fifth signal, and perform a six-level decision on the fourth signal to obtain sixteen-level signals.
  • the receiver may first establish a correspondence table between the amplitude of the target signal at the previous level, the amplitude of the current third signal, the amplitude of the current fourth signal, and the amplitude of the current target signal.
  • the receiver 601 may be an optoelectronic receiver, such as a Receiver Optical Sub-Assemblies (ROSA) or the like.
  • ROSA Receiver Optical Sub-Assemblies
  • an optical network system is further provided, as shown in FIG. 7, including a transmitter and a receiver; the transmitter may be any possible transmitter in the foregoing embodiment; the receiver It may be any of the possible receivers of the above embodiments.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Physics & Mathematics (AREA)
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Abstract

L'invention concerne un procédé pour recevoir et émettre un signal, un émetteur, un récepteur et un système de réseau optique. Le procédé pour émettre un signal dans un mode de réalisation de la présente invention consiste : à recevoir des premiers signaux et des deuxièmes signaux, et réaliser une modulation d'amplitude d'impulsion sur les premiers signaux et les deuxièmes signaux pour délivrer des troisièmes signaux, les premiers signaux et les deuxièmes signaux étant un signal de niveau M, les troisièmes signaux étant des signaux de niveau 2M, et M étant un nombre entier positif ; et à réaliser une modulation de porteuse optique sur les troisièmes signaux pour délivrer des signaux optiques, une tension de polarisation d'un modulateur étant V = 2Vpi * N, Vpi étant une différence entre une tension correspondant à une alimentation de sortie maximale et une tension correspondant à une alimentation de sortie minimale du modulateur, et N étant un nombre entier positif. Des modes de réalisation de la présente invention réduisent un rapport puissance de porteuse sur puissance de signal (CSPR) et améliorent les performances de système.
PCT/CN2015/083655 2015-07-09 2015-07-09 Procédé pour recevoir et émettre un signal, émetteur, récepteur et système de réseau optique Ceased WO2017004829A1 (fr)

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CN201580081335.3A CN107852247B (zh) 2015-07-09 2015-07-09 收发信号的方法、发射机、接收机和光网络系统

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CN110401486A (zh) * 2019-08-07 2019-11-01 青岛海信宽带多媒体技术有限公司 一种光模块及光发射控制方法
CN110401486B (zh) * 2019-08-07 2022-06-24 青岛海信宽带多媒体技术有限公司 一种光模块及光发射控制方法
CN113824508A (zh) * 2021-11-23 2021-12-21 国开启科量子技术(北京)有限公司 强度调制器偏置点标定设备及方法

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