技术领域technical field
本发明属于光纤-无线(Radio-over-Fiber，ROF)通信系统技术领域，具体涉及一种基于偏振复用的强度调制器的M2-QAM RF信号发生方法及系统。The invention belongs to the technical field of radio-over-fiber (Radio-over-Fiber, ROF) communication systems, and in particular relates to an M2 -QAM RF signal generation method and system based on a polarization multiplexing intensity modulator.
背景技术Background technique
随着人工智能和物联网等新技术的出现以及智能手机的发展，互联网发展到了一个新阶段。基于移动终端的多媒体应用不断涌现，其主要特征是要求高带宽和低延迟。因此，无线通信也应朝着更大的系统容量和更低延迟的方向发展。现在，第五代无线传输技术(5G)已经向毫米波频段发展，以利用更多的频谱资源。众所周知，光纤-无线(ROF)技术具有低成本、低损耗和大带宽的优点，因此ROF已经成为一种有前途的下一代毫米波无线接入技术被广泛研究。With the emergence of new technologies such as artificial intelligence and the Internet of Things and the development of smartphones, the Internet has developed to a new stage. Multimedia applications based on mobile terminals are constantly emerging, and their main features are high bandwidth and low delay requirements. Therefore, wireless communication should also develop towards greater system capacity and lower latency. Now, the fifth generation wireless transmission technology (5G) has been developed to the millimeter wave frequency band to utilize more spectrum resources. As we all know, the fiber-optic (ROF) technology has the advantages of low cost, low loss and large bandwidth, so ROF has been widely studied as a promising next-generation millimeter-wave wireless access technology.
如何在ROF系统中产生自适应光子辅助的二维正交幅度调制(M2-QAM)信号是一个具有很大研究价值的问题。由于M2-QAM调制可以实现同相和正交两个维度的信号加载，因此可以提高调制信号的频谱效率，从而实现双倍的传输比特速率。若要使用纯电子方法，我们可以使用数字模拟转换器(DAC)或同相/正交(I/Q)混频器来生成M2-QAM的电射频信号。但是在高频下，DAC的带宽难以满足要求，并且非常昂贵。对于I/Q混频器，高频带宽也是难于达到的。目前已经有了一些在毫米波ROF系统中合成M2-QAM信号的方法。例如，一种具有2×1MIMO无线的多天线ROF系统，该系统在光域中设置光延迟线来调整相位并保持信号的正交性，从而使两个独立的开关键控(OOK)信号在接收器处组合成具有双比特率的4QAM信号。但是，目前的方法都具有结构复杂并且不稳定的缺点。How to generate adaptive photon-assisted two-dimensional quadrature amplitude modulation (M2 -QAM) signals in ROF systems is a problem of great research value. Since the M2 -QAM modulation can implement signal loading in two dimensions of in-phase and quadrature, it can improve the spectral efficiency of the modulated signal, thereby achieving a double transmission bit rate. To use a purely electronic approach, we can use a digital-to-analog converter (DAC) or an in-phase/quadrature (I/Q) mixer to generate an electrical RF signal for M2 -QAM. But at high frequencies, the bandwidth of the DAC is difficult to meet the requirements, and it is very expensive. For I/Q mixers, high frequency bandwidth is also difficult to achieve. There are already some methods for synthesizing M2 -QAM signals in millimeter wave ROF systems. For example, a multi-antenna ROF system with 2×1 MIMO wireless, which sets an optical delay line in the optical domain to adjust the phase and maintain the orthogonality of the signals, so that two independent on-off keying (OOK) signals in the Combined at the receiver into a 4QAM signal with double bit rate. However, the current methods all have the disadvantages of complex structure and instability.
发明内容Contents of the invention
本发明是为了解决上述问题而进行的，目的在于提供一种基于偏振复用的强度调制器的M2-QAM RF信号发生方法及系统，基于偏振复用强度调制器的光子辅助方法来生成M2-QAM RF(二维正交幅度调制射频)信号，结构简单，能够大大提高调制效率。The present invention is carried out in order to solve the above problems, and the purpose is to provide an M2 -QAM RF signal generation method and system based on a polarization multiplexed intensity modulator, and a photon-assisted method based on a polarization multiplexed intensity modulator to generate M2 -QAM RF (two-dimensional quadrature amplitude modulated radio frequency) signal has a simple structure and can greatly improve modulation efficiency.
本发明提供了一种基于偏振复用的强度调制器的M2-QAM RF信号发生方法，具有这样的特征，包括以下步骤：使用激光器生成激光；使用射频源产生两路单频射频信号；使用移相器使其中一路单频射频信号产生相位偏移实现正交调制；使用数字源产生数字域的基带信号；使用混频器将基带信号与单频射频信号混频，得到射频信号；使用射频信号驱动偏振复用强度调制器，对激光进行调制，产生一个双边带光信号；使用光电探测器对双边带光信号进行拍频，产生M2-QAM信号。The present invention provides a M2 -QAM RF signal generation method based on a polarization multiplexed intensity modulator, which has such features and includes the following steps: using a laser to generate laser light; using a radio frequency source to generate two single-frequency radio frequency signals; using The phase shifter makes one of the single-frequency RF signals generate a phase shift to realize quadrature modulation; use a digital source to generate a baseband signal in the digital domain; use a mixer to mix the baseband signal with a single-frequency RF signal to obtain a RF signal; use RF The signal drives the polarization multiplexing intensity modulator to modulate the laser light to generate a double-sideband optical signal; the photodetector is used to beat the double-sideband optical signal to generate an M2 -QAM signal.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生方法中，还可以具有这样的特征：其中，单频射频信号为正弦波射频信号。In the M2 -QAM RF signal generation method based on the polarization multiplexed intensity modulator provided by the present invention, it may also have such a feature: wherein, the single-frequency radio frequency signal is a sine wave radio frequency signal.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生方法中，还可以具有这样的特征：其中，激光器为DFB激光器或者外腔激光器。In the method for generating an M2 -QAM RF signal based on a polarization multiplexed intensity modulator provided by the present invention, it may also have such a feature: wherein, the laser is a DFB laser or an external cavity laser.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生方法中，还可以具有这样的特征：其中，相位偏移为90度或2π的整数倍加上90度。In the M2 -QAM RF signal generation method based on the polarization multiplexed intensity modulator provided by the present invention, it may also have such a feature: wherein, the phase offset is 90 degrees or an integer multiple of 2π plus 90 degrees.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生方法中，还可以具有这样的特征：其中，M2-QAM信号的相位偏移为90度或2π的整数倍加上90度。In the M2 -QAM RF signal generation method based on the polarization multiplexed intensity modulator provided by the present invention, it may also have such a feature: wherein, the phase shift of the M2 -QAM signal is 90 degrees or an integer multiple of 2π plus 90 degrees up.
本发明还提供了一种基于偏振复用的强度调制器的M2-QAM RF信号发生系统，具有这样的特征，包括：激光器，用于产生任意波长的连续波的激光；射频源，用于产生单频射频信号a1(t)和单频射频信号a2(t)；移相器，用于调整其中单频射频信号a2(t)的相位使其偏移90度或2π的整数倍加上90度实现正交调制，得到调整后单频射频信号a2(t)；第一数据源，用于产生数字域的第一基带信号；第二数据源，用于产生数字域的第二基带信号；第一混频器，用于将单频射频信号a1(t)和第一基带信号混频，得到第一射频信号；第二混频器，用于将调整后单频射频信号a2(t)和第二基带信号混频，得到第二射频信号；偏振复用强度调制器，用于将第一射频信号和第二射频信号调制到激光上，得到一个具有两个偏振态的双边带光信号；光电探测器，用于将双边带光信号进行拍频，得到二维正交幅度调制射频(M2-QAM RF)信号。The present invention also provides an M2 -QAM RF signal generation system based on a polarization multiplexed intensity modulator, which has such features, including: a laser for generating continuous wave lasers of arbitrary wavelengths; a radio frequency source for Generate a single-frequency radio frequency signal a1 (t) and a single-frequency radio frequency signal a2 (t); a phase shifter is used to adjust the phase of the single-frequency radio frequency signal a2 (t) to make it shift by 90 degrees or an integer of 2π Multiplying 90 degrees to realize quadrature modulation, to obtain the adjusted single-frequency radio frequency signal a2 (t); the first data source is used to generate the first baseband signal in the digital domain; the second data source is used to generate the first baseband signal in the digital domain Two baseband signals; the first mixer is used to mix the single-frequency radio frequency signal a1 (t) with the first baseband signal to obtain the first radio frequency signal; the second mixer is used to mix the adjusted single-frequency radio frequency The signal a2 (t) is mixed with the second baseband signal to obtain a second radio frequency signal; the polarization multiplexing intensity modulator is used to modulate the first radio frequency signal and the second radio frequency signal to the laser to obtain a laser with two polarizations The double-sideband optical signal in the state; the photodetector is used to beat the double-sideband optical signal to obtain a two-dimensional quadrature amplitude modulated radio frequency (M2 -QAM RF) signal.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生系统中，还可以具有这样的特征：其中，激光器为DFB激光器或者外腔激光器。In the M2 -QAM RF signal generation system based on the polarization multiplexed intensity modulator provided by the present invention, it may also have such a feature: wherein, the laser is a DFB laser or an external cavity laser.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生系统中，还可以具有这样的特征：其中，相位偏移为90度或2π的整数倍加上90度。In the M2 -QAM RF signal generation system based on the polarization multiplexed intensity modulator provided by the present invention, it may also have the feature that the phase offset is 90 degrees or an integer multiple of 2π plus 90 degrees.
在本发明提供的基于偏振复用的强度调制器的M2-QAM RF信号发生系统中，还可以具有这样的特征：其中，M2-QAM信号的相位偏移为90度或2π的整数倍加上90度。In the M2 -QAM RF signal generating system based on the intensity modulator of polarization multiplexing provided by the present invention, it may also have such a feature: wherein, the phase shift of the M2 -QAM signal is 90 degrees or an integer multiple of 2π plus 90 degrees up.
发明的作用与效果Function and Effect of Invention
根据本发明所提供的二维正交幅度调制(M2-QAM)射频(RF)信号发生方法及系统，使用激光器生成激光，使用射频源产生两路正弦波射频信号，使用移相器让其中一路产生相位偏移实现正交调制，使用数字源产生数字域的基带信号，使用混频器将基带信号与射频信号混频得到射频信号，使用射频信号驱动偏振复用强度调制器，对激光进行调制，产生一个双边带光信号，使用光电探测器对双边带光信号进行拍频，产生M2-QAM信号。该M2-QAM信号信号的正交和同相两个维度都调制了信号，信息速率是波特率的两倍，在光纤中相对于无线传输有较小的损耗小，可以在色散位移光纤中传输较长距离。According to the two-dimensional quadrature amplitude modulation (M2 -QAM) radio frequency (RF) signal generation method and system provided by the present invention, a laser is used to generate laser light, a radio frequency source is used to generate two sine wave radio frequency signals, and a phase shifter is used to make the One channel generates phase offset to realize quadrature modulation, uses a digital source to generate a baseband signal in the digital domain, uses a mixer to mix the baseband signal and a radio frequency signal to obtain a radio frequency signal, uses the radio frequency signal to drive a polarization multiplexing intensity modulator, and conducts laser Modulate to generate a double-sideband optical signal, and use a photodetector to beat the double-sideband optical signal to generate an M2 -QAM signal. Both the quadrature and in-phase dimensions of the M2 -QAM signal modulate the signal, and the information rate is twice the baud rate. Compared with wireless transmission in optical fiber, it has less loss and can be used in dispersion-shifted optical fiber Transmission over longer distances.
该体系仅仅需要一个远程天线单元(RAU)即射频源作为发射端，而不是复杂的多输入多输出(MIMO)结构；而且其核心模块仅依靠一个偏振复用强度调制器，实现M2-QAM RF信号的生成，以一种更加低成本和稳定的方式，大大提高了调制效率。信号正交性的保持取决于电域中的移相器，而不取决于ODL，因此它可以达到更稳定的效果。The system only needs a remote antenna unit (RAU), that is, a radio frequency source, as the transmitting end, rather than a complex multiple-input multiple-output (MIMO) structure; and its core module only relies on a polarization multiplexing intensity modulator to realize M2 -QAM The generation of RF signals, in a more cost-effective and stable manner, greatly improves the modulation efficiency. The preservation of signal orthogonality depends on the phase shifter in the electrical domain, not on the ODL, so it can achieve a more stable effect.
本发明利用M2-QAM RF信号具有调制效率高、方便灵活的特点，采用将正交和同相两路信号加载到互不串扰的两个光偏振态的方法，使用一个移相器实现相位的正交调制，提高了调制效率，使用一个偏振复用的强度调制器实现两路信号的合成简化了系统发射端结构，不需要宽带的混频器，避免了结构复杂的DAC或者I/Q混频器的使用，降低了发射端电子器件的带宽要求，降低了系统成本，该发明将在未来以ROF系统为主的接入网络发挥巨大优势，从而有效降低系统成本。The invention utilizes the characteristics of high modulation efficiency, convenience and flexibility of the M2 -QAM RF signal, adopts the method of loading the quadrature and in-phase signals into two optical polarization states that do not interfere with each other, and uses a phase shifter to realize the phase Orthogonal modulation improves the modulation efficiency, using a polarization multiplexed intensity modulator to realize the synthesis of two signals simplifies the structure of the transmitting end of the system, does not require a broadband mixer, and avoids complex DAC or I/Q mixing The use of the frequency converter reduces the bandwidth requirements of the electronic devices at the transmitting end and reduces the system cost. This invention will play a huge advantage in the access network dominated by the ROF system in the future, thereby effectively reducing the system cost.
附图说明Description of drawings
图1是本发明的实施例中的二维正交幅度调制射频信号发生系统的结构示意图。FIG. 1 is a schematic structural diagram of a two-dimensional quadrature amplitude modulation radio frequency signal generation system in an embodiment of the present invention.
具体实施方式Detailed ways
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，以下结合实施例及附图对本发明一种二维正交幅度调制(M2-QAM)射频(RF)信号发生方法及系统作具体阐述。In order to make the technical means, creative features, goals and effects of the present invention easy to understand, a two-dimensional quadrature amplitude modulation (M2 -QAM) radio frequency (RF) signal generation method of the present invention will be described below in conjunction with the embodiments and accompanying drawings and the system in detail.
<实施例><Example>
本实施例对一种二维正交幅度调制(M2-QAM)射频(RF)信号发生方法及系统做具体阐述。In this embodiment, a two-dimensional quadrature amplitude modulation (M2 -QAM) radio frequency (RF) signal generation method and system are described in detail.
图1是本发明的实施例中的二维正交幅度调制(M2-QAM)射频(RF)信号发生系统的结构示意图。FIG. 1 is a schematic structural diagram of a two-dimensional quadrature amplitude modulation (M2 -QAM) radio frequency (RF) signal generation system in an embodiment of the present invention.
如图1所示，二维正交幅度调制射频信号发生系统包括：射频源1、激光器2、第一数据源3、第二数据源33、移相器4、第一混频器5、第二混频器55、偏振复用强度调制器6及光电探测器7。As shown in Figure 1, the two-dimensional quadrature amplitude modulation radio frequency signal generation system includes: a radio frequency source 1, a laser 2, a first data source 3, a second data source 33, a phase shifter 4, a first mixer 5, a second Two mixers 55 , polarization multiplexing intensity modulators 6 and photodetectors 7 .
激光器2的输出端与偏振复用强度调制器6的光输入端用光纤连接。The output end of the laser 2 is connected to the optical input end of the polarization multiplexed intensity modulator 6 with an optical fiber.
射频源1的输出端与移相器4的输入端用电缆相连，移相器4的输出端与第二混频器55的输入端用电缆相连。同时，射频源1的输出端也与第一混频器5的输入端用电缆相连。The output end of the radio frequency source 1 is connected with the input end of the phase shifter 4 with a cable, and the output end of the phase shifter 4 is connected with the input end of the second mixer 55 with a cable. At the same time, the output end of the radio frequency source 1 is also connected to the input end of the first mixer 5 with a cable.
第一数据源3的输出端与第一混频器5的输入端用电缆相连。第二数据源33的输出端与第二混频器55的输入端用电缆相连。The output terminal of the first data source 3 is connected with the input terminal of the first mixer 5 by a cable. The output terminal of the second data source 33 is connected to the input terminal of the second mixer 55 with a cable.
第一混频器5的输出端与偏振复用强度调制器6中的X偏振态的电输入端用电缆连接，第二混频器55的输出端与偏振复用强度调制器6中的Y偏振态的电输入端用电缆连接。The output end of the first mixer 5 is connected with the electrical input end of the X polarization state in the polarization multiplexing intensity modulator 6, and the output end of the second mixer 55 is connected with the Y polarization state in the polarization multiplexing intensity modulator 6. The electrical input for the polarization state is connected with a cable.
偏振复用强度调制器6的输出端与光电探测器7的输入端用光缆相连。The output end of the polarization multiplexing intensity modulator 6 is connected with the input end of the photodetector 7 with an optical cable.
射频源1产生两路单频射频信号，用于驱动偏振复用强度调制器6。The radio frequency source 1 generates two channels of single-frequency radio frequency signals, which are used to drive the polarization multiplexing intensity modulator 6 .
两路单频射频信号为单频射频信号a1(t)和单频射频信号a2(t)，均为正弦波射频信号。The two single-frequency radio frequency signals are a single-frequency radio frequency signal a1 (t) and a single-frequency radio frequency signal a2 (t), both of which are sinusoidal radio frequency signals.
移相器4调整其中一路单频射频信号a2(t)的相位使其偏移实现正交调制。移相器4调整a2(t)的相位偏移90度或2π的整数倍加上90度，得到调整后单频射频信号a2(t)。经过移相器4的单频射频信号a2(t)仍保持正交性。The phase shifter 4 adjusts the phase of one of the single-frequency radio frequency signals a2 (t) to shift to realize quadrature modulation. The phase shifter 4 adjusts the phase shift of a2 (t) by 90 degrees or an integer multiple of 2π plus 90 degrees to obtain the adjusted single-frequency radio frequency signal a2 (t). The single-frequency radio frequency signal a2 (t) passing through the phase shifter 4 still maintains orthogonality.
激光器2产生光纤通信指定波长的连续波激光。激光器可以是DFB激光器、外腔激光器或其他激光器。在本实施例中，激光器2为DFB激光器，产生波长λ的连续波激光。The laser 2 generates continuous wave laser with specified wavelength for optical fiber communication. The laser can be a DFB laser, an external cavity laser or other lasers. In this embodiment, the laser 2 is a DFB laser, which generates continuous wave laser light with a wavelength of λ.
第一数据源3产生数字域的第一基带信号，第二数据源33产生数字域的第二基带信号。The first data source 3 generates a first baseband signal in the digital domain, and the second data source 33 generates a second baseband signal in the digital domain.
第一混频器5将射频源1产生的单频射频信号a1(t)和第一数据源3产生的第一基带信号混频，得到第一射频信号，实现电信号的上变频。The first mixer 5 mixes the single-frequency radio frequency signal a1 (t) generated by the radio frequency source 1 and the first baseband signal generated by the first data source 3 to obtain a first radio frequency signal to realize up-conversion of electrical signals.
第二混频器55将经过移相器4调整的调整后单频射频信号a2(t)和第二数据源33产生的第二基带信号混频，得到第二射频信号，实现电信号的上变频。The second mixer 55 mixes the adjusted single-frequency radio frequency signal a2 (t) adjusted by the phase shifter 4 with the second baseband signal generated by the second data source 33 to obtain a second radio frequency signal, so as to realize the electric signal upconversion.
第一射频信号与第二射频信号是极化正交的偏振信号，它们自己互不串扰。The first radio frequency signal and the second radio frequency signal are polarized signals with orthogonal polarization, and they do not interfere with each other.
在第一射频信号和第二射频信号的驱动下，偏振复用强度调制器6将第一混频器5产生的第一射频信号和第二混频器55产生的第二射频信号调制到激光源2产生的波长λ的连续波激光的波长上，实现两个偏振态的光双边带调制，得到一个具有两个偏振态的双边带光信号。Driven by the first radio frequency signal and the second radio frequency signal, the polarization multiplexing intensity modulator 6 modulates the first radio frequency signal generated by the first mixer 5 and the second radio frequency signal generated by the second mixer 55 to the laser At the wavelength of the continuous wave laser with wavelength λ generated by the source 2, optical double sideband modulation with two polarization states is realized, and a double sideband optical signal with two polarization states is obtained.
光电探测器7将双边带光信号进行拍频，得到二维正交幅度调制射频(M2-QAM RF)信号。该信号的相位偏移90度或2π的整数倍加上90度。The photodetector 7 beats the double sideband optical signal to obtain a two-dimensional quadrature amplitude modulated radio frequency (M2 -QAM RF) signal. The phase of this signal is shifted by 90 degrees or an integer multiple of 2π plus 90 degrees.
因为使用了极化正交且相位相差90度的第一射频信号与第二射频信号驱动偏振复用强度调制器6，而偏振复用强度调制器6将第一射频信号与第二射频信号调制到激光源2产生连续波激光的波长上，因此经过光电探测器7拍频产生的二维正交幅度调制射频(M2-QAM RF)信号的正交和同相两个维度都调制了信号，信息速率是波特率的两倍。又由于采用了两维调制，所以提高了调制效率。Because the polarization multiplexing intensity modulator 6 is driven by the first radio frequency signal and the second radio frequency signal which are polarized orthogonally and have a phase difference of 90 degrees, and the polarization multiplexing intensity modulator 6 modulates the first radio frequency signal and the second radio frequency signal To the wavelength of the continuous wave laser generated by the laser source 2, the quadrature and in-phase two dimensions of the two-dimensional quadrature amplitude modulation radio frequency (M2 -QAM RF) signal generated by the beat frequency of the photodetector 7 have modulated the signal, The information rate is twice the baud rate. Furthermore, since two-dimensional modulation is adopted, the modulation efficiency is improved.
实施例的作用与效果Function and effect of embodiment
根据本实施例提供的二维正交幅度调制(M2-QAM)射频(RF)信号发生方法及系统，使用激光器生成激光，使用射频源产生两路正弦波射频信号，使用移相器让其中一路产生相位偏移，使用数字源产生数字域的基带信号，使用混频器将基带信号调制到射频信号上，使用混频后的射频信号驱动偏振复用强度调制器，对激光进行调制，产生一个双边带光信号，使用光电探测器对产生的双边带光信号进行拍频，产生M2-QAM信号。该M2-QAM信号的正交和同相两个维度都调制了信号，信息速率是波特率的两倍，在光纤中相对于无线传输有较小的损耗，可以在色散位移光纤中传输较长距离。According to the two-dimensional quadrature amplitude modulation (M2 -QAM) radio frequency (RF) signal generation method and system provided in this embodiment, a laser is used to generate laser light, a radio frequency source is used to generate two sine wave radio frequency signals, and a phase shifter is used to make the All the way to generate a phase shift, use a digital source to generate a baseband signal in the digital domain, use a mixer to modulate the baseband signal to a radio frequency signal, use the mixed radio frequency signal to drive a polarization multiplexing intensity modulator, and modulate the laser to generate A double-sideband optical signal, using a photodetector to beat the generated double-sideband optical signal to generate an M2 -QAM signal. Both the quadrature and in-phase dimensions of the M2 -QAM signal modulate the signal, and the information rate is twice the baud rate. Compared with wireless transmission in the optical fiber, there is less loss, and it can be transmitted in the dispersion-shifted optical fiber. long distance.
该体系仅仅需要一个远程天线单元(RAU)即射频源作为发射端，而不是复杂的多输入多输出(MIMO)结构。而且其核心模块仅依靠一个偏振复用强度调制器，实现M2-QAM RF信号的生成，以一种更加低成本和稳定的方式，大大提高了调制效率。信号正交性的保持取决于电域中的移相器，而不取决于ODL，因此它可以达到更稳定的效果。The system only needs a remote antenna unit (RAU), that is, a radio frequency source, as a transmitting end, rather than a complex multiple-input multiple-output (MIMO) structure. Moreover, its core module only relies on a polarization multiplexing intensity modulator to realize the generation of M2 -QAM RF signals, which greatly improves the modulation efficiency in a more low-cost and stable manner. The preservation of signal orthogonality depends on the phase shifter in the electrical domain, not on the ODL, so it can achieve a more stable effect.
本发明利用M2-QAM RF信号具有调制效率高、方便灵活的特点，采用将正交和同相两路信号加载到互不串扰的两个光偏振态的方法，使用一个移相器实现相位的正交调制，提高了调制效率，使用一个偏振复用的强度调制器实现两路信号的合成简化了系统发射端结构，不需要宽带的混频器，避免了结构复杂的DAC或者I/Q混频器的使用，降低了发射端电子器件的带宽要求，降低了系统成本，该发明将在未来以ROF系统为主的接入网络发挥巨大优势，从而有效降低系统成本。The invention utilizes the characteristics of high modulation efficiency, convenience and flexibility of the M2 -QAM RF signal, adopts the method of loading the quadrature and in-phase signals into two optical polarization states that do not interfere with each other, and uses a phase shifter to realize the phase Orthogonal modulation improves the modulation efficiency, using a polarization multiplexed intensity modulator to realize the synthesis of two signals simplifies the structure of the transmitting end of the system, does not require a broadband mixer, and avoids complex DAC or I/Q mixing The use of the frequency converter reduces the bandwidth requirements of the electronic devices at the transmitting end and reduces the system cost. This invention will play a huge advantage in the access network dominated by the ROF system in the future, thereby effectively reducing the system cost.
上述实施方式为本发明的优选案例，并不用来限制本发明的保护范围。The above embodiments are preferred examples of the present invention, and are not intended to limit the protection scope of the present invention.
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| CN202010343091.4ACN111614403B (en) | 2020-04-27 | 2020-04-27 | M2-QAM RF signal generation method and system based on polarization multiplexing intensity modulator |
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