WO2017004829A1 - Method for receiving and transmitting signal, transmitter, receiver, and optical network system - Google Patents

Method for receiving and transmitting signal, transmitter, receiver, and optical network system 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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signal
level
amplitude
optical
decision
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PCT/CN2015/083655
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French (fr)
Chinese (zh)
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左天健
张亮
周恩波
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华为技术有限公司
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Priority to PCT/CN2015/083655 priority Critical patent/WO2017004829A1/en
Priority to CN201580081335.3A priority patent/CN107852247B/en
Publication of WO2017004829A1 publication Critical patent/WO2017004829A1/en

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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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Abstract

Disclosed are a method for receiving and transmitting a signal, a transmitter, a receiver, and an optical network system. The method for transmitting a signal in an embodiment of the present invention comprises: receiving first signals and second signals, and performing pulse amplitude modulation on the first signals and the second signals to output third signals, wherein the first signals and the second signals are M level signal, the third signals are 2M level signals, and M is a positive integer; and performing optical carrier modulation on the third signals to output optical signals, wherein a bias voltage of a modulator is V=2Vpi*N, Vpi is a difference between a voltage corresponding to a maximum output power and a voltage corresponding to a minimum output power of the modulator, and N is a positive integer. Embodiments of the present invention reduce a carrier-to-signal power ratio (CSPR) and improve system performance.

Description

收发信号的方法、发射机、接收机和光网络系统Method for transmitting and receiving signals, transmitter, receiver and optical network system 技术领域Technical field
本发明涉及通讯技术领域，尤其涉及一种收发信号的方法、发射机、接收机和光网络系统。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.
背景技术Background technique
脉冲振幅调制(Pulse Amplitude Modulation，PAM)是脉冲载波的幅度随基带信号变化的一种调制方式，相比于多载波调制，PAM调制具有低功耗与易于互联互通等先天优势。Pulse Amplitude Modulation (PAM) 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.
在短距离光通信中，成本是值得考虑的重要因素之一，在当前阶段强度调制直接检测(Intensity Modulation and direct detection，IMDD)系统相对于相干系统具有很大成本优势，而在IMDD系统里载波信号功率比(Carrier to signal power ratio，CSPR)是一个影响性能的重要指标。In short-distance optical communication, cost is one of the important factors to consider. In the current stage, Intensity Modulation and Direct Detection (IMDD) system has a large cost advantage over coherent systems, while in IMDD system, carrier The carrier to signal power ratio (CSPR) is an important indicator of performance.
传统的IMDD系统中的PAM调制，多电平一般调制在正交点(quadrature point，quad点)，即调制器的偏置电压被设置到了2Vpi*N+Vpi/2，N为整数，Vpi为调制器的固有参数，此时载波也就是直流光所占的功率在总功率的一半以上，既实际信号功率占总功率的1/2以上，导致CSPR比较高，影响系统性能。In the traditional IMDD system, PAM modulation, multi-level general modulation at the quadrature point (quad point), that is, 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.
发明内容Summary of the invention
本发明实施例提供了一种收发信号的方法、发射机、接收机和光网络系统，降低了发送信号时载波信号功率比CSPR，提升了系统性能。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.
本发明实施例第一方面提供了一种发送信号的方法，包括：A first aspect of the embodiments of the present invention provides a method for sending a signal, including:
接收第一信号和第二信号，对所述第一信号和第二信号进行脉幅调制输出第三信号，所述第一信号和第二信号为M电平信号，所述第三信号为2M电平信号，其中M为正整数；Receiving the first signal and the second signal, and performing amplitude modulation on the first signal and the second signal to output a third signal, the first signal and the second signal being M-level signals, and the third signal is 2M Level signal, where M is a positive integer;
对所述第三信号进行光载波调制，输出光信号，其中，调制器的偏置电压V＝2Vpi*N，Vpi等于所述调制器的最大输出功率对应的电压与最小输出功率对应的电压两者的差，N为正整数。Performing optical carrier modulation on the third signal, and outputting an optical signal, wherein the bias voltage of the modulator is V=2Vpi*N, and Vpi is equal to a voltage corresponding to the maximum output power of the modulator and a voltage corresponding to the minimum output power. The difference between the two, N is a positive integer.
结合本发明实施例的第一方面，在本发明实施例的第一方面的第一种可能的实现方式中，所述第一信号和第二信号为交流耦合的不归零信号。 In conjunction with the first aspect of the embodiments of the present invention, in a first possible implementation manner of the first aspect of the embodiments, the first signal and the second signal are AC-coupled non-return-to-zero signals.
结合本发明实施例的第一方面，在本发明实施例的第一方面的第二种可能的实现方式中，所述M＝2。With reference to the first aspect of the embodiments of the present invention, in a second possible implementation manner of the first aspect of the embodiment of the present invention, the M=2.
本发明实施例第二方面提供了一种接收信号的方法，包括：A second aspect of the embodiments of the present invention provides a method for receiving a signal, including:
接收光信号；Receiving an optical signal;
对所述光信号进行采样得到采样信号；Sampling the optical signal to obtain a sampling signal;
对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息；根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号；Performing multi-level decision on the sampling signal to obtain amplitude information at each sampling point time; and searching for a preset amplitude correspondence table according to the amplitude information of each sampling point time to obtain a target signal;
对所述目标信号进行解码得到第一信号和第二信号。Decoding the target signal to obtain a first signal and a second signal.
结合本发明实施例的第二方面，在本发明实施例的第二方面的第一种可能的实现方式中，With reference to the second aspect of the embodiments of the present invention, in a first possible implementation manner of the second aspect of the embodiments of the present invention,
所述对所述光信号进行采样得到采样信号包括：The sampling the optical signal to obtain a sampling signal includes:
对所述光信号在T1时刻进行采样得到第三信号；Sampling the optical signal at time T1 to obtain a third signal;
对所述光信号在T2时刻进行采样得到第四信号；Sampling the optical signal at time T2 to obtain a fourth signal;
其中，T1＝T0+Tb*N和T2＝T0+Tb/2+Tb*N，N为非负整数，Tb为一个符号周期，T0为所述光信号眼图中第一次幅度最大值和第二次幅度最大值之间交叉点出现的时刻；Where T1=T0+Tb*N and T2=T0+Tb/2+Tb*N, N is a non-negative integer, Tb is a symbol period, and 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;
所述对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息包括：The multi-level decision on the sampling signal to obtain amplitude information at each sampling point time includes:
对所述第三信号进行多电平判决，得到第五信号；Performing multilevel decision on the third signal to obtain a fifth signal;
对所述第四信号进行多电平判决，得到第六信号；Performing multilevel decision on the fourth signal to obtain a sixth signal;
根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号包括：According to the amplitude information of each sampling point moment, searching for the preset amplitude correspondence table to obtain the target signal includes:
根据所述第五信号、所述第六信号各时刻的幅度信息，查找预置的幅度对应表得到所述目标信号，所述预置的幅度对应表为上一电平时刻目标信号的幅度、当前第五信号的幅度、当前第六信号的幅度、当前目标信号的幅度之间的对应关系表。And searching for a preset amplitude correspondence table according to the amplitude information of each of the fifth signal and the sixth signal to obtain the target signal, where the preset amplitude correspondence table is an amplitude of a target signal of a previous level time, A table of correspondence between the amplitude of the current fifth signal, the amplitude of the current sixth signal, and the amplitude of the current target signal.
结合本发明实施例的第二方面的第一种可能的实现方式，在本发明实施例的第二方面的第二种可能的实现方式中，With reference to the first possible implementation manner of the second aspect of the embodiment of the present invention, in a second possible implementation manner of the second aspect of the embodiment of the present invention,
所述对所述第三信号进行多电平判决，得到第五信号，包括：Performing multi-level decision on the third signal to obtain a fifth signal, including:
对所述第三信号进行两电平判决，得到两电平第五信号； Performing a two-level decision on the third signal to obtain a two-level fifth signal;
所述对所述第四信号进行多电平判决，得到第六信号，包括：Performing multi-level decision on the fourth signal to obtain a sixth signal, including:
对所述第四信号进行四电平判决，得到四电平第六信号。A four-level decision is made on the fourth signal to obtain a four-level sixth signal.
结合本发明实施例的第二方面的第一种可能的实现方式，在本发明实施例的第二方面的第三种可能的实现方式中，With reference to the first possible implementation manner of the second aspect of the embodiment of the present invention, in a third possible implementation manner of the second aspect of the embodiment of the present invention,
所述对所述第三信号进行多电平判决，得到第五信号，包括：Performing multi-level decision on the third signal to obtain a fifth signal, including:
对所述第三信号进行四电平判决，得到四电平第五信号；Performing a four-level decision on the third signal to obtain a four-level fifth signal;
所述对所述第四信号进行多电平判决，得到第六信号，包括：Performing multi-level decision on the fourth signal to obtain a sixth signal, including:
对所述第四信号进行八电平判决，得到八电平第六信号。An eight-level decision is made on the fourth signal to obtain an eight-level sixth signal.
结合本发明实施例的第二方面的第一种可能的实现方式，在本发明实施例的第二方面的第四种可能的实现方式中，With reference to the first possible implementation manner of the second aspect of the embodiment of the present invention, in a fourth possible implementation manner of the second aspect of the embodiment of the present invention,
所述对所述第三信号进行多电平判决，得到第五信号，包括：Performing multi-level decision on the third signal to obtain a fifth signal, including:
对所述第三信号进行八电平判决，得到八电平第五信号；Performing an eight-level decision on the third signal to obtain an eight-level fifth signal;
所述对所述第四信号进行多电平判决，得到第六信号，包括：Performing multi-level decision on the fourth signal to obtain a sixth signal, including:
对所述第四信号进行十六电平判决，得到十六电平第六信号。A sixteen-level decision is made on the fourth signal to obtain a sixteen-level sixth signal.
本发明实施例第三方面提供了一种发射机，包括：A third aspect of the embodiments of the present invention provides a transmitter, including:
编码器，用于接收第一信号和第二信号，对所述第一信号和第二信号进行脉幅调制输出第三信号，所述第一信号和第二信号为M电平信号，所述第三信号为2M电平信号，其中M为正整数；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;
调制器，用于对所述第三信号进行光载波调制，输出光信号，其中，所述调制器的偏置电压V＝2Vpi*N，Vpi等于所述调制器的最大输出功率对应的电压与最小输出功率对应的电压两者的差，N为正整数。a modulator for performing optical carrier modulation on the third signal, outputting an optical signal, wherein a bias voltage of the modulator is V=2Vpi*N, and Vpi is equal to a voltage corresponding to a maximum output power of the modulator The difference between the voltages corresponding to the minimum output power, N is a positive integer.
结合本发明实施例的第三方面，在本发明实施例的第三方面的第一种可能的实现方式中，所述第一信号和第二信号为交流耦合的不归零信号。In conjunction with the third aspect of the embodiments of the present invention, in a first possible implementation manner of the third aspect of the embodiments, the first signal and the second signal are AC-coupled non-return-to-zero signals.
结合本发明实施例的第三方面，在本发明实施例的第三方面的第二种可能的实现方式中，所述M＝2。With reference to the third aspect of the embodiments of the present invention, in a second possible implementation manner of the third aspect of the embodiment of the present invention, the M=2.
本发明实施例第四方面提供了一种接收机，包括：A fourth aspect of the embodiments of the present invention provides a receiver, including:
接收器，用于接收发送端传输的光信号；a receiver, configured to receive an optical signal transmitted by the transmitting end;
处理器，用于对所述光信号进行采样得到采样信号，对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息；根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号； 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;
解码器，用于对所述目标信号进行解码得到第一信号和第二信号。And a decoder, configured to decode the target signal to obtain a first signal and a second signal.
结合本发明实施例的第四方面，在本发明实施例的第四方面的第一种可能的实现方式中，With reference to the fourth aspect of the embodiments of the present invention, in a first possible implementation manner of the fourth aspect of the embodiment of the present invention,
所述处理器具体用于对所述光信号在T1时刻进行采样得到第三信号，以及对所述光信号在T2时刻进行采样得到第四信号；其中，T1＝T0+Tb*N和T2＝T0+Tb/2+Tb*N，N为非负整数，Tb为一个符号周期，T0为所述光信号眼图中第一次幅度最大值和第二次幅度最大值之间交叉点出现的时刻；The processor is specifically configured to sample the optical signal at a time T1 to obtain a third signal, and sample the optical signal at a time T2 to obtain a fourth signal; wherein, T1=T0+Tb*N and T2= T0+Tb/2+Tb*N, N is a non-negative integer, Tb is a symbol period, and T0 is the intersection between the first amplitude maximum and the second amplitude maximum in the eye diagram of the optical signal. time;
所述处理器具体还用于对所述第三信号进行多电平判决，得到第五信号，以及对所述第四信号进行多电平判决，得到第六信号；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;
所述处理器具体还用于根据所述第五信号、所述第六信号各时刻的幅度信息，查找预置的幅度对应表得到所述目标信号，所述预置的幅度对应表为上一电平时刻目标信号的幅度、当前第五信号的幅度、当前第六信号的幅度、当前目标信号的幅度之间的对应关系表。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. A table of correspondence between the amplitude of the target signal at the level time, the amplitude of the current fifth signal, the amplitude of the current sixth signal, and the amplitude of the current target signal.
结合本发明实施例的第四方面第一种可能的实现方式，在本发明实施例的第四方面的第二种可能的实现方式中，With reference to the first possible implementation manner of the fourth aspect of the embodiment of the present invention, in a second possible implementation manner of the fourth aspect of the embodiment of the present invention,
所述处理器具体用于对所述第三信号进行两电平判决，得到两电平第五信号，以及对所述第四信号进行四电平判决，得到四电平第六信号。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.
结合本发明实施例的第四方面第一种可能的实现方式，在本发明实施例的第四方面的第三种可能的实现方式中，With reference to the first possible implementation manner of the fourth aspect of the embodiment of the present invention, in a third possible implementation manner of the fourth aspect of the embodiment of the present invention,
所述处理器具体用于对所述第三信号进行四电平判决，得到四电平第五信号，以及对所述第四信号进行八电平判决，得到八电平第六信号。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.
结合本发明实施例的第四方面第一种可能的实现方式，在本发明实施例的第四方面的第四种可能的实现方式中，With reference to the first possible implementation manner of the fourth aspect of the embodiment of the present invention, in a fourth possible implementation manner of the fourth aspect of the embodiment of the present invention,
所述处理器具体用于对所述第三信号进行八电平判决，得到八电平第五信号，以及对所述第四信号进行十六电平判决，得到十六电平第六信号。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.
本发明实施例第四方面提供了一种光网络系统，包括任一第三方面所述的发射机和任一第四方面所述的接收机。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.
从以上技术方案可以看出，本发明实施例具有以下优点：It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:
本发明实施例中，在对第三信号进行光载波调制时，调制器的偏置电压V＝2Vpi*N，此时调制后输出的光信号为AC耦合信号,由于AC耦合信号是没 有直流的,而光的直流就是光载波,由于没有载波,即载波功率为0，此时，信号本身的功率就变大了,降低了载波信号功率比CSPR，提升了系统性能。In the embodiment of the present invention, when the third carrier is subjected to optical carrier modulation, the bias voltage of the modulator is V=2Vpi*N, and the optical signal output after modulation is an AC coupled signal, because the AC coupled signal is not There is DC, and the DC 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, which improves the system performance.
附图说明DRAWINGS
图1是本发明实施例中发送信号的方法的一个实施例示意图；1 is a schematic diagram of an embodiment of a method for transmitting a signal according to an embodiment of the present invention;
图2是本发明实施例中接收信号的方法的一个实施例示意图；2 is a schematic diagram of an embodiment of a method for receiving a signal according to an embodiment of the present invention;
图3是本发明实施例中接收信号的方法的另一个实施例示意图；3 is a schematic diagram of another embodiment of a method for receiving a signal according to an embodiment of the present invention;
图4是本发明实施例中PAM4调制示意图以及调制后信号的光谱和眼图；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;
图5是本发明实施例中发射机的一个实施例示意图；FIG. 5 is a schematic diagram of an embodiment of a transmitter in an embodiment of the present invention; FIG.
图6是本发明实施例中接收机的一个实施例示意图；6 is a schematic diagram of an embodiment of a receiver in an embodiment of the present invention;
图7是本发明实施例中光网络系统的一个实施例示意图。FIG. 7 is a schematic diagram of an embodiment of an optical network system in an embodiment of the present invention.
具体实施方式detailed description
本发明实施例提供了一种收发信号的方法、发射机、接收机和光网络系统，降低了载波信号功率比CSPR，提升了系统性能。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.
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。The terms "first", "second", and the like (if any) in the specification and claims of the present invention and the above figures are used to distinguish similar objects, and are not necessarily used to describe a particular order or order. It is to be understood that the data so used may be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than what is illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.
为了方便理解本发明实施例，首先在此介绍本发明实施例描述中会引入的几个要素；In order to facilitate the understanding of the embodiments of the present invention, several elements introduced in the description of the embodiments of the present invention are first introduced herein;
马赫-曾德尔调制器(Mach-Zehnder Modulator)：简称MZM调制器，是将 输入光经过Y分支后分成两路相等的信号分别进入调制器的两个光支路(两臂：上臂和下臂)，这两个光支路采用的材料是电光性材料，其折射率随外部施加的电信号大小而变化，由于光支路的折射率变化会导致信号相位的变化，当两个支路信号调制器输出端再次结合在一起时，合成的光信号将是一个强度大小变化的干涉信号，相当于把电信号的变化转换成了光信号的变化，实现了光强度的调制，简而言之，该调制器通过控制其偏置电压，可以实现不同边带的调制。Mach-Zehnder Modulator: 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. In short, the modulator can realize the modulation of different sidebands by controlling the bias voltage.
眼图：眼图是一系列数字信号在示波器上累积而显示的图形，它包含了丰富的信息，从眼图上可以观察出码间串扰和噪声的影响，体现了数字信号整体的特征，从而估计系统优劣程度，因而眼图分析是高速互连系统信号完整性分析的核心，另外也可以用此图形对接收滤波器的特性加以调整，以减小码间串扰，改善系统的传输性能。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.
载波信号功率比(Carrier to signal power ratio，CSPR)等于载波功率除以信号总功率。The carrier to signal power ratio (CSPR) is equal to the carrier power divided by the total signal power.
多电平判决，即设定多个阈值，对信号的电平进行多电平判决，例如两电平判决就是设定一个阈值然后比较收到的信号比阈值大还是阈值小，比如阈值是0.5V，那大于0.5V的都是1，小于0.5V的都是0，再例如，以四电平为例，有3个阈值，0.5V，1.5V，2.5V，小于0.5V的都是0，在0.5V与1.5V之间的都是1，在1.5V和2.5V之间的都是2，在2.5V以上的都是3。Multi-level decision, that is, setting a plurality of thresholds, and performing multi-level decision on the level of the signal. For example, 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. For example, taking four levels as an example, 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.
不归零信号：Non-Return to Zero，简称NRZ，对于传输数字信号来说,最简单最常用的方法是用不同的电压电平来表示两个二进制数字,也即数字信号由矩形脉冲组成，按数字编码方式，可以划分为单极性码和双极性码，单极性码使用正(或负)的电压表示数据；双极性码是二进制码，1为反转，0为保持零电平。根据信号是否归零，还可以划分为归零信号和信号，归零信号码元中间的信号回归到0电平，例如“1”为正电平，“0”为负电平，每个数据表示完毕后，都会回归到零电平状态，而不归零信号没有回归到零电平的过程，例如“1”为高电平，“0”为低电平。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.
NRZ信号就是最常见在电上传播的信号，NRZ就是需要要发送的原始信号，可以是使宽带数据，数字视频，或数字语音信号。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.
本发明提供一种收发信号的方法、发射机、接收机和光网络系统，应用于 IMDD系统，本发明实施例提供的一种光网络系统中，在信号发送端，发射机通过对输入的第一信号和第二信号进行调制后得到第三信号，通过调制器对第三信号调制输出成光信号，此时，调制器的调制偏置电压设置V＝2Vpi*N，其中，N为正整数，Vpi为预设的调制参数，Vpi等于所述调制器的最大输出功率对应的电压与最小输出功率对应的电压两者的差；在信号的接收端，接收机通过采样，多电平判决、查表恢复后，再进行解码后得到第一信号和第二信号。光信号由发送端传输到接收端，由于调制器的调制偏置电压设置为2Vpi*N，调制后得到的光信号就变成AC耦合信号,由于AC耦合信号是没有直流的,而光的直流就是光载波,由于没有载波,即载波功率为0，此时，信号本身的功率就变大了,降低了载波信号功率比CSPR。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. At this time, the modulation bias voltage of the modulator is set to V=2Vpi*N, where N is a positive integer, Vpi is a preset modulation parameter, and Vpi is equal to the voltage corresponding to the maximum output power of the modulator. The difference between the voltages corresponding to the minimum output power; at the receiving end of the signal, the receiver obtains the first signal and the second signal after sampling, multi-level decision, and table look-up recovery. 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.
下面首先介绍本发明实施例中提供的一种发送信号的方法的实施例，应用于信号发送端，本发明实施例中发送信号的方法的执行主体为发射机。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.
请参阅图1，本发明实施例中发送信号的方法的一个实施例包括：Referring to FIG. 1, an embodiment of a method for transmitting a signal in an embodiment of the present invention includes:
101、接收第一信号和第二信号，对所述第一信号和第二信号进行脉幅调制输出第三信号；101. Receive a first signal and a second signal, and perform amplitude modulation on the first signal and the second signal to output a third signal.
其中，所述第一信号和第二信号为M电平信号，所述第三信号为2M电平信号，其中M为正整数，所述第一信号、第二信号可以是NRZ信号，也可以是其他调制后的信号，此处不做限定；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;
102、对所述第三信号进行光载波调制，输出光信号，其中调制器的偏置电压V＝2Vpi*N；102, performing optical carrier modulation on the third signal, and outputting an optical signal, wherein a bias voltage of the modulator is V=2Vpi*N;
其中，Vpi等于所述调制器的最大输出功率对应的电压与最小输出功率对应的电压两者的差，N为正整数。Wherein, 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, and N is a positive integer.
本发明实施例中，在对第三信号进行光载波调制时，调制器的偏置电压V＝2Vpi*N，此时调制后输出的光信号为AC耦合信号,由于AC耦合信号是没有直流的,而光的直流就是光载波,由于没有载波,即载波功率为0，此时，信号本身的功率就变大了,降低了载波信号功率比CSPR，提升了系统性能。In the embodiment of the present invention, when the third carrier is subjected to optical carrier modulation, the bias voltage of the modulator is V=2Vpi*N, and 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.
可选的，所述第一信号和第二信号为交流耦合的不归零信号。Optionally, the first signal and the second signal are AC-coupled non-return-to-zero signals.
可选的，本发明实施例中，所述M＝2,3或4等正整数，例如当M＝2时，即为PAM4调制，此处不做限定。Optionally, in the embodiment of the present invention, the positive integer of M=2, 3, or 4, for example, when M=2, is PAM4 modulation, which is not limited herein.
下面介绍本实施例中接收信号的方法的实施例，本发明实施例中接收信号 的方法应用于信号接收端，执行主体为接收机。An embodiment of a method for receiving a signal in this embodiment is described below, and a signal is received in an embodiment of the present invention. The method is applied to the signal receiving end, and the execution body is the receiver.
请参阅图2，本发明实施例中接收信号的方法的一个实施例包括：Referring to FIG. 2, an embodiment of a method for receiving a signal in an embodiment of the present invention includes:
201、接收光信号；201. Receive an optical signal.
所述光信号可以为如上实施例中所述发送信号的方法中发送的光信号；The optical signal may be an optical signal transmitted in a method of transmitting a signal as described in the above embodiments;
202、对所述光信号进行采样得到采样信号；202. Sample the optical signal to obtain a sampling signal.
203、对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息；根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号；203. Perform multi-level decision on the sampling signal to obtain amplitude information at each sampling point time; and find a target signal according to the amplitude information of each sampling point time to find a preset amplitude correspondence table;
204、对所述目标信号进行解码得到第一信号和第二信号。204. Decode the target signal to obtain a first signal and a second signal.
本实施例中，通过对接收到的光信号进行采样、多电平判决、查表恢复得到调制前的目标信号，进行解码即可得到信号发送端原始发送的第一信号和第二信号。In this embodiment, 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.
请参阅图3，本发明实施例中接收信号的方法的另一个实施例包括：Referring to FIG. 3, another embodiment of a method for receiving a signal in an embodiment of the present invention includes:
301、接收光信号；301. Receive an optical signal;
所述光信号可以为如上实施例中所述发送信号的方法中发送的光信号；The optical signal may be an optical signal transmitted in a method of transmitting a signal as described in the above embodiments;
302、对所述光信号在T1时刻进行采样得到第三信号，对所述光信号在T2时刻进行采样得到第四信号；302. 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.
其中，T1＝T0+Tb*N和T2＝T0+Tb/2+Tb*N，N为非负整数，Tb为一个符号周期，T0为所述光信号眼图中第一次幅度最大值和第二次幅度最大值之间交叉点出现的时刻；Where T1=T0+Tb*N and T2=T0+Tb/2+Tb*N, N is a non-negative integer, Tb is a symbol period, and 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;
本实施例中，接收机具有时钟恢复功能，可以确定光信号眼图中第一次幅度最大值所在时刻和第二次幅度最大值所在时刻之间的交叉点出现的时刻T0，则T1、T2即可以根据T0按上述公式确定。In this embodiment, 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.
303、对所述第三信号进行多电平判决，得到第五信号，对所述第四信号进行多电平判决，得到第六信号；303. 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.
由于接收的光信号由不同PAM调制方式得到，本步骤中对第三信号和第四信号进行多电平判决有多种方式：Since the received optical signal is obtained by different PAM modulation methods, there are multiple ways to perform multi-level decision on the third signal and the fourth signal in this step:
当接收的光信号是PAM4调制后发送的，所述对所述第三信号进行多电平判决，得到第五信号，包括：对所述第三信号进行两电平判决，得到两电平第五信号；所述对所述第四信号进行多电平判决，得到第六信号，包括：对所述第四信号进行四电平判决，得到四电平第六信号。 When the received optical signal is transmitted by the PAM4, 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.
当接收的光信号是PAM8调制后发送的，所述对所述第三信号进行多电平判决，得到第五信号，包括：对所述第三信号进行四电平判决，得到四电平第五信号；所述对所述第四信号进行多电平判决，得到第六信号，包括：对所述第四信号进行八电平判决，得到八电平第六信号。When the received optical signal is transmitted by PAM8, 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.
当接收的光信号是PAM8调制后发送的，所述对所述第三信号进行多电平判决，得到第五信号，包括：对所述第三信号进行八电平判决，得到八电平第五信号；所述对所述第四信号进行多电平判决，得到第六信号，包括：对所述第四信号进行十六电平判决，得到十六电平第六信号。When the received optical signal is transmitted by the PAM8, 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.
其中，两电平判决就是设定一个阈值然后比较收到的信号比阈值大还是阈值小，比如阈值是0.5V，那大于0.5V的都是1，小于0.5V的都是0；Wherein, 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;
同理，四电平判决，设置有3个阈值，0.5V，1.5V，2.5V，小于0.5V的都是0，在0.5V与1.5V之间的都是1，在1.5V和2.5V之间的都是2，在2.5V以上的都是3，依次类推，八电平判决会设置八个阈值，进行八电平判决。Similarly, 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.
304、根据所述第五信号、所述第六信号各时刻的幅度信息，查找预置的幅度对应表得到所述目标信号；304. Search for a preset amplitude correspondence table according to the amplitude information of each of the fifth signal and the sixth signal to obtain the target signal.
其中，所述预置的幅度对应表为上一电平时刻目标信号的幅度ck-1、当前第五信号的幅度bk、当前第六信号的幅度ak、当前目标信号的幅度ck之间的对应关系表，其中k为正整数，k大于1，目标信号的幅度初始值C1为发射机和接收机约定的初始值，即对发射机和接收机均是已知的。Wherein, 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 A correspondence table between k, which is a positive integer, k is greater than 1, and 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.
例如，当接收的光信号是PAM4调制得到的时，所述预置的幅度对应表中幅度对应关系，可以是如下表一：For example, when the received optical signal is obtained by PAM4 modulation, the preset amplitude corresponds to the amplitude correspondence in the table, which may be as follows:
表1Table 1
ck-1 c k-1 ak a k bk b k ck c k
00 11 00 22
00 22 00 11
00 00 11 33
00 33 11 00
11 00 00 22
11 11 00 11
11 11 11 33
11 22 11 00
22 00 00 11
22 11 00 22
22 11 11 00
22 22 11 33
33 11 00 11
33 22 00 22
33 00 11 00
33 33 11 33
由上表1可知，通过知道上一电平时刻目标信号的幅度ck-1、当前第五信号的幅度bk、当前第六信号的幅度ak，即可确定当前目标信号的幅度ck。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 .
305、对所述目标信号进行解码得到第一信号和第二信号。305. Decode the target signal to obtain a first signal and a second signal.
本实施例中，通过对接收的上述发射机得到的光信号进行采样、多电平判决、查表恢复得到调制前的目标信号，对所述目标信号进行解码即可得到信号发送端原始发送的M电平第一信号和第二信号。In this embodiment, 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. M level first signal and second signal.
以PAM4调制为例，M＝2，发射机接收的2路两电平NRZ信号，在对第三信号进行调制转换成光信号时，调制的偏置电压为2Vpi*N，如图4所示，此时，图4左侧图中，先下后上的曲线为调制器的功率调制曲线，先上后下的曲线为调制器的光场调制曲线，其中黑色箭头的起始位置既为null点，即调制的偏置电压V＝2Vpi*N的点，图4右侧图为调制后PAM4信号的眼图和光谱，光谱中可以看到，中间黑色的尖峰就是直流，眼图可以看到两个周期，每个周期都变成了1个眼2个电平(bk出现的位置)，bk为输入的4电平信号ck混叠后的信号，每个周期内交叉点变成了4电平，也就是ak出现的位置，因此根据调制后的光信号的上述特征在信号接收端(接收机)即可采取对应方式恢复调制器调制前的电信号，通过对该电信号解码即可得到NRZ信号。Taking PAM4 modulation as an example, M=2, the two-way two-level NRZ signal received by the transmitter, when modulating and converting the third signal into an optical signal, the modulation bias voltage is 2Vpi*N, as shown in FIG. At this time, in the left diagram of Fig. 4, the curve of the first lower and the upper is the power modulation curve of the modulator, and 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. It can be seen in the spectrum that the black peak in the middle is DC, and the eye diagram can be seen. In two cycles, 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.
可选的，本发明实施例中，还可以先在发射机建立上一电平时刻目标信号的幅度、当前第五信号的幅度、当前第六信号的幅度、当前目标信号的幅度之间的对应关系表。Optionally, in the embodiment of the present invention, 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.
下面介绍本发明实施例中提供的一种发射机的实施例，应用于信号发送端，请参阅图5，本发明实施例中发射机500的一个实施例包括：An embodiment of a transmitter provided in the embodiment of the present invention is applied to a signal transmitting end. Referring to FIG. 5, an embodiment of the transmitter 500 in the embodiment of the present invention includes:
编码器501，用于接收第一信号和第二信号，对所述第一信号和第二信号进行脉幅调制输出第三信号，所述第一信号和第二信号为M电平信号，所述第三信号为2M电平信号，其中M为正整数；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;
调制器502，用于对所述第三信号进行光载波调制，输出光信号，其中，所述调制器的偏置电压V＝2Vpi*N，Vpi等于所述调制器的最大输出功率对应 的电压与最小输出功率对应的电压两者的差，N为正整数。a modulator 502, configured to perform optical carrier modulation on the third signal, and output an optical signal, wherein a bias voltage of the modulator is V=2Vpi*N, and Vpi is equal to a maximum output power of the modulator. The difference between the voltage and the voltage corresponding to the minimum output power, N is a positive integer.
可选的，所述第一信号和第二信号为交流耦合的不归零信号。Optionally, the first signal and the second signal are AC-coupled non-return-to-zero signals.
可选的，所述M＝2。Optionally, the M=2.
由于一般信号调制器无法将调制偏置电压设置为2Vpi*N，优选的，所述调制器为MZM调制器。Since the general signal modulator cannot set the modulation bias voltage to 2Vpi*N, preferably, the modulator is an MZM modulator.
本实施例中将调制器502的调制偏置电压设置为2Vpi*N，此时得到的光信号为AC耦合信号,由于没有载波,即载波功率为0,降低了调制得到的光信号的CSPR。In this embodiment, 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.
下面介绍接收机的实施例，如图6所示，本发明实施例中接收机600的一个实施例包括：An embodiment of the receiver is described below. As shown in FIG. 6, an embodiment of the receiver 600 in the embodiment of the present invention includes:
接收器601，用于接收发送端传输的光信号；a receiver 601, configured to receive an optical signal transmitted by the transmitting end;
处理器602，用于对所述光信号进行采样得到采样信号，对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息；根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号；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;
解码器603，用于对所述目标信号进行解码得到第一信号和第二信号。The decoder 603 is configured to decode the target signal to obtain a first signal and a second signal.
本实施例中，处理器602通过对接收器601接收的上述发射机得到的光信号进行采样、多电平判决、查表恢复得到调制前的目标信号，解码器603对所述目标信号进行解码即可得到信号发送端原始发送的M电平第一信号和第二信号。In this embodiment, 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.
可选的，所述处理器602具体用于对所述光信号在T1时刻进行采样得到第三信号，以及对所述光信号在T2时刻进行采样得到第四信号；其中，T1＝T0+Tb*N和T2＝T0+Tb/2+Tb*N，N为非负整数，Tb为一个符号周期，T0为所述光信号眼图中第一次幅度最大值和第二次幅度最大值之间交叉点出现的时刻；Optionally, the processor 602 is specifically configured to: sample the optical signal at a time T1 to obtain a third signal, and sample the optical signal at a time T2 to obtain a fourth signal; where, T1=T0+Tb *N and T2=T0+Tb/2+Tb*N, N is a non-negative integer, Tb is a symbol period, and T0 is the first amplitude maximum and the second amplitude maximum in the optical signal eye diagram. The moment when the intersection occurs;
其中，接收机具有时钟恢复功能能够确定光信号眼图中第一次幅度最大值所在时刻和第二次幅度最大值所在时刻之间的交叉点出现的时刻T0，则T1、T2即可以根据T0按上述公式确定，根据时钟恢复功能确定眼图中的幅度最大值时刻为现有技术，此处不再详述。Wherein, 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.
所述处理器602具体还用于对所述第三信号进行多电平判决，得到第五信号，以及对所述第四信号进行多电平判决，得到第六信号； 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;
所述处理器602具体还用于根据所述第五信号、所述第六信号各时刻的幅度信息，查找预置的幅度对应表得到所述目标信号，所述预置的幅度对应表为上一电平时刻目标信号的幅度、当前第五信号的幅度、当前第六信号的幅度、当前目标信号的幅度之间的对应关系表。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.
可选的，所述处理器602具体用于对所述第三信号进行两电平判决，得到两电平第五信号，以及对所述第四信号进行四电平判决，得到四电平第六信号。Optionally, 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.
可选的，所述处理器602具体用于对所述第三信号进行四电平判决，得到四电平第五信号，以及对所述第四信号进行八电平判决，得到八电平第六信号。Optionally, 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.
可选的，所述处理器602具体用于对所述第三信号进行八电平判决，得到八电平第五信号，以及对所述第四信号进行十六电平判决，得到十六电平第六信号。Optionally, 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.
可选的，接收机还可以先建立上一电平时刻目标信号的幅度、当前第三信号的幅度、当前第四信号的幅度、当前目标信号的幅度之间的对应关系表。Optionally, 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.
本实施例中，接收器601可以是光电接收机，例如光接收子系统(Receiver Optical Sub-Assemblies，ROSA)等。In this embodiment, the receiver 601 may be an optoelectronic receiver, such as a Receiver Optical Sub-Assemblies (ROSA) or the like.
本发明实施例中，同时还提供一种光网络系统，如图7所示，包括发射机和接收机；所述发射机可以为上述实施例中任一种可能的发射机；所述接收机可以为上述实施例中任一种可能的接收机。In the embodiment of the present invention, 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.
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。 In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, 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. In addition, 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.
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。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.
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。In addition, 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.
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。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. Based on such understanding, 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. .
以上所述，以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。 The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims (17)

  1. 一种发送信号的方法，其特征在于，包括：A method for transmitting a signal, comprising:
    接收第一信号和第二信号，对所述第一信号和第二信号进行脉幅调制输出第三信号，所述第一信号和第二信号为M电平信号，所述第三信号为2M电平信号，其中M为正整数；Receiving the first signal and the second signal, and performing amplitude modulation on the first signal and the second signal to output a third signal, the first signal and the second signal being M-level signals, and the third signal is 2M Level signal, where M is a positive integer;
    对所述第三信号进行光载波调制，输出光信号，其中，调制器的偏置电压V＝2Vpi*N，Vpi等于所述调制器的最大输出功率对应的电压与最小输出功率对应的电压两者的差，N为正整数。Performing optical carrier modulation on the third signal, and outputting an optical signal, wherein the bias voltage of the modulator is V=2Vpi*N, and Vpi is equal to a voltage corresponding to the maximum output power of the modulator and a voltage corresponding to the minimum output power. The difference between the two, N is a positive integer.
  2. 根据权利要求1所述的发送信号的方法，其特征在于，所述第一信号和第二信号为交流耦合的不归零信号。The method of transmitting a signal according to claim 1, wherein said first signal and said second signal are AC-coupled non-return-to-zero signals.
  3. 根据权利要求1所述的发送信号的方法，其特征在于，所述M＝2。The method of transmitting a signal according to claim 1, wherein said M = 2.
  4. 一种接收信号的方法，其特征在于，包括：A method for receiving a signal, comprising:
    接收光信号；Receiving an optical signal;
    对所述光信号进行采样得到采样信号；Sampling the optical signal to obtain a sampling signal;
    对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息；根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号；Performing multi-level decision on the sampling signal to obtain amplitude information at each sampling point time; and searching for a preset amplitude correspondence table according to the amplitude information of each sampling point time to obtain a target signal;
    对所述目标信号进行解码得到第一信号和第二信号。Decoding the target signal to obtain a first signal and a second signal.
  5. 根据权利要求4所述的接收信号的方法，其特征在于，所述对所述光信号进行采样得到采样信号包括：The method for receiving a signal according to claim 4, wherein the sampling the optical signal to obtain a sampling signal comprises:
    对所述光信号在T1时刻进行采样得到第三信号；Sampling the optical signal at time T1 to obtain a third signal;
    对所述光信号在T2时刻进行采样得到第四信号；Sampling the optical signal at time T2 to obtain a fourth signal;
    其中，T1＝T0+Tb*N和T2＝T0+Tb/2+Tb*N，N为非负整数，Tb为一个符号周期，T0为所述光信号眼图中第一次幅度最大值和第二次幅度最大值之间交叉点出现的时刻；Where T1=T0+Tb*N and T2=T0+Tb/2+Tb*N, N is a non-negative integer, Tb is a symbol period, and 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;
    所述对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息包括：The multi-level decision on the sampling signal to obtain amplitude information at each sampling point time includes:
    对所述第三信号进行多电平判决，得到第五信号；Performing multilevel decision on the third signal to obtain a fifth signal;
    对所述第四信号进行多电平判决，得到第六信号；Performing multilevel decision on the fourth signal to obtain a sixth signal;
    根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号包括： According to the amplitude information of each sampling point moment, searching for the preset amplitude correspondence table to obtain the target signal includes:
    根据所述第五信号、所述第六信号各时刻的幅度信息，查找预置的幅度对应表得到所述目标信号，所述预置的幅度对应表为上一电平时刻目标信号的幅度、当前第五信号的幅度、当前第六信号的幅度、当前目标信号的幅度之间的对应关系表。And searching for a preset amplitude correspondence table according to the amplitude information of each of the fifth signal and the sixth signal to obtain the target signal, where the preset amplitude correspondence table is an amplitude of a target signal of a previous level time, A table of correspondence between the amplitude of the current fifth signal, the amplitude of the current sixth signal, and the amplitude of the current target signal.
  6. 根据权利要求5所述的接收信号的方法，其特征在于，包括：The method of receiving a signal according to claim 5, comprising:
    所述对所述第三信号进行多电平判决，得到第五信号，包括：Performing multi-level decision on the third signal to obtain a fifth signal, including:
    对所述第三信号进行两电平判决，得到两电平第五信号；Performing a two-level decision on the third signal to obtain a two-level fifth signal;
    所述对所述第四信号进行多电平判决，得到第六信号，包括：Performing multi-level decision on the fourth signal to obtain a sixth signal, including:
    对所述第四信号进行四电平判决，得到四电平第六信号。A four-level decision is made on the fourth signal to obtain a four-level sixth signal.
  7. 根据权利要求5所述的接收信号的方法，其特征在于，包括：The method of receiving a signal according to claim 5, comprising:
    所述对所述第三信号进行多电平判决，得到第五信号，包括：Performing multi-level decision on the third signal to obtain a fifth signal, including:
    对所述第三信号进行四电平判决，得到四电平第五信号；Performing a four-level decision on the third signal to obtain a four-level fifth signal;
    所述对所述第四信号进行多电平判决，得到第六信号，包括：Performing multi-level decision on the fourth signal to obtain a sixth signal, including:
    对所述第四信号进行八电平判决，得到八电平第六电信号。An eight-level decision is made on the fourth signal to obtain an eight-level sixth electrical signal.
  8. 根据权利要求5所述的接收信号的方法，其特征在于，包括：The method of receiving a signal according to claim 5, comprising:
    所述对所述第三信号进行多电平判决，得到第五信号，包括：Performing multi-level decision on the third signal to obtain a fifth signal, including:
    对所述第三信号进行八电平判决，得到八电平第五信号；Performing an eight-level decision on the third signal to obtain an eight-level fifth signal;
    所述对所述第四信号进行多电平判决，得到第六信号，包括：Performing multi-level decision on the fourth signal to obtain a sixth signal, including:
    对所述第四信号进行十六电平判决，得到十六电平第六信号。A sixteen-level decision is made on the fourth signal to obtain a sixteen-level sixth signal.
  9. 一种发射机，其特征在于，包括：A transmitter, comprising:
    编码器，用于接收第一信号和第二信号，对所述第一信号和第二信号进行脉幅调制输出第三信号，所述第一信号和第二信号为M电平信号，所述第三信号为2M电平信号，其中M为正整数；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;
    调制器，用于对所述第三信号进行光载波调制，输出光信号，其中，所述调制器的偏置电压V＝2Vpi*N，Vpi等于所述调制器的最大输出功率对应的电压与最小输出功率对应的电压两者的差，N为正整数。a modulator for performing optical carrier modulation on the third signal, outputting an optical signal, wherein a bias voltage of the modulator is V=2Vpi*N, and Vpi is equal to a voltage corresponding to a maximum output power of the modulator The difference between the voltages corresponding to the minimum output power, N is a positive integer.
  10. 根据权利要求9所述的发射机，其特征在于，所述第一信号和第二信号为交流耦合的不归零信号。The transmitter of claim 9 wherein said first signal and said second signal are AC coupled non-return to zero signals.
  11. 根据权利要求9所述的发射机，其特征在于，所述M＝2。The transmitter of claim 9 wherein said M = 2.
  12. 一种接收机，其特征在于，包括： A receiver, comprising:
    接收器，用于接收发送端传输的光信号；a receiver, configured to receive an optical signal transmitted by the transmitting end;
    处理器，用于对所述光信号进行采样得到采样信号，对所述采样信号进行多电平判决，得到各采样点时刻的幅度信息；根据所述各采样点时刻的幅度信息，查找预置的幅度对应表得到目标信号；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;
    解码器，用于对所述目标信号进行解码得到第一信号和第二信号。And a decoder, configured to decode the target signal to obtain a first signal and a second signal.
  13. 根据权利要求12所述的接收机，其特征在于，A receiver according to claim 12, wherein
    所述处理器具体用于对所述光信号在T1时刻进行采样得到第三信号，以及对所述光信号在T2时刻进行采样得到第四信号；其中，T1＝T0+Tb*N和T2＝T0+Tb/2+Tb*N，N为非负整数，Tb为一个符号周期，T0为所述光信号眼图中第一次幅度最大值和第二次幅度最大值之间交叉点出现的时刻；The processor is specifically configured to sample the optical signal at a time T1 to obtain a third signal, and sample the optical signal at a time T2 to obtain a fourth signal; wherein, T1=T0+Tb*N and T2= T0+Tb/2+Tb*N, N is a non-negative integer, Tb is a symbol period, and T0 is the intersection between the first amplitude maximum and the second amplitude maximum in the eye diagram of the optical signal. time;
    所述处理器具体还用于对所述第三信号进行多电平判决，得到第五电信号，以及对所述第四信号进行多电平判决，得到第六信号；The processor is further configured to perform multi-level decision on the third signal, obtain a fifth electrical signal, and perform multi-level decision on the fourth signal to obtain a sixth signal;
    所述处理器具体还用于根据所述第五信号、所述第六信号各时刻的幅度信息，查找预置的幅度对应表得到所述目标信号，所述预置的幅度对应表为上一电平时刻目标信号的幅度、当前第五信号的幅度、当前第六信号的幅度、当前目标信号的幅度之间的对应关系表。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. A table of correspondence between the amplitude of the target signal at the level time, the amplitude of the current fifth signal, the amplitude of the current sixth signal, and the amplitude of the current target signal.
  14. 根据权利要求13所述的接收机，其特征在于，The receiver of claim 13 wherein:
    所述处理器具体用于对所述第三信号进行两电平判决，得到两电平第五信号，以及对所述第四信号进行四电平判决，得到四电平第六信号。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.
  15. 根据权利要求13所述的接收机，其特征在于，The receiver of claim 13 wherein:
    所述处理器具体用于对所述第三信号进行四电平判决，得到四电平第五信号，以及对所述第四信号进行八电平判决，得到八电平第六信号。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.
  16. 根据权利要求13所述的接收机，其特征在于，The receiver of claim 13 wherein:
    所述处理器具体用于对所述第三信号进行八电平判决，得到八电平第五信号，以及对所述第四信号进行十六电平判决，得到十六电平第六信号。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.
  17. 一种光网络系统，其特征在于，包括权利要求9至11中任一项所述的发射机和权利要求12至16中任一项所述的接收机。 An optical network system comprising the transmitter of any one of claims 9 to 11 and the receiver of any one of claims 12 to 16.
PCT/CN2015/083655 2015-07-09 2015-07-09 Method for receiving and transmitting signal, transmitter, receiver, and optical network system WO2017004829A1 (en)

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