CN110445542A - The 20 times frequency optical millimeter waves device and method based on nested Mach-Zehnder modulators - Google Patents
The 20 times frequency optical millimeter waves device and method based on nested Mach-Zehnder modulators Download PDFInfo
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Abstract
本发明公开了一种基于嵌套马赫‑曾德尔调制器的二十倍频光载毫米波的装置和方法，激光器发出的光波经过嵌套调制器被射频信号调制，嵌套调制器上臂和下臂分别由两个级联的MZM子调制器构成，级联MZM子调制器之间的射频驱动信号的相位差都为π/2，每个子调制器的相位差都为π；嵌套调制器上下两臂分别输出信号生成4k+2阶边带，调制指数使幅度正比于2阶贝塞尔函数的2阶边带为零，上下两路信号相加产生(±6,±10…)阶边带；设置嵌套调制器上下两臂的射频驱动信号相位差为π/6，使输出的6阶边带因相位相反相加为零，输出10阶边带，在光电探测器拍频产生二十倍频毫米波信号。本发明无需光滤波器可产生二十倍频光载毫米波。
The invention discloses a device and method for a 20-fold frequency optical carrier millimeter wave based on a nested Mach-Zehnder modulator. The light wave emitted by the laser is modulated by a radio frequency signal through the nested modulator, and the upper arm and the lower arm of the nested modulator The arms are composed of two cascaded MZM sub-modulators, the phase difference of the RF driving signal between the cascaded MZM sub-modulators is π/2, and the phase difference of each sub-modulator is π; the nested modulator The upper and lower arms respectively output signals to generate 4k+2-order sidebands. The modulation index makes the 2nd-order sidebands whose amplitude is proportional to the 2nd-order Bessel function to be zero, and the upper and lower signals are added to generate (±6,±10…) order Sideband: set the RF drive signal phase difference between the upper and lower arms of the nested modulator to π/6, so that the output 6th-order sidebands are added to zero due to the phase reversal, and the 10th-order sidebands are output, which are generated at the beat frequency of the photodetector Twenty-fold millimeter-wave signal. The present invention can generate twenty-fold frequency optical-carrying millimeter wave without optical filter.
Description
技术领域technical field
本发明涉及光电信号处理方法，尤其涉及一种产生二十倍频光载毫米波的方法及其装置。The invention relates to a photoelectric signal processing method, in particular to a method and a device for generating twenty-fold frequency optical-carried millimeter waves.
背景技术Background technique
随着信息社会的快速发展，用户对无线通信接入的带宽和速率提出了更高的要求。毫米波通信因其高带宽和高速率成为宽带无线通信的有力竞争者。60GHz及以上频率波段将成为无线局域网的首选频段。光纤无线通信RoF技术结合了光纤通信的高带宽大和无线通信接入灵活等优点，能提高毫米波通信的传输距离。然而，受限于铌酸锂马赫-曾德尔调制器(MZM)较低的频率响应，直接将毫米波信号调制到光频上存在困难，同时高频射频器件的成本较高，这些都需要采用多倍频技术产生高频光载毫米波。因此如何产生高质量的多倍频光载毫米波就成为了问题的突破口。With the rapid development of the information society, users have put forward higher requirements on the bandwidth and rate of wireless communication access. Millimeter wave communication has become a strong competitor of broadband wireless communication because of its high bandwidth and high speed. 60GHz and above frequency band will become the preferred frequency band for WLAN. Optical fiber wireless communication RoF technology combines the advantages of high bandwidth of optical fiber communication and flexible wireless communication access, etc., and can improve the transmission distance of millimeter wave communication. However, limited by the low frequency response of the lithium niobate Mach-Zehnder modulator (MZM), it is difficult to directly modulate the millimeter-wave signal to the optical frequency, and the cost of high-frequency radio frequency devices is high, all of which need to be used Multi-frequency technology generates high-frequency optical-carrying millimeter waves. Therefore, how to generate high-quality multi-frequency optical-carrying millimeter waves has become a breakthrough in the problem.
与四倍频、六倍频、八倍频、十倍频或十二倍频等多倍频毫米波信号产生方案相比，二十倍频方案可以产生更高频率的毫米波信号或进一步降低对调制器带宽的需要。已经报道的产生多倍频光载毫米波的方法有集成调制器法产生八倍频[光学学报，2014，4(3):0306004-1-8]、调制器+受激布里渊散射法产生十倍频[光电子·激光，2015,35(4):695-699]、级联调制器+光纤光栅法产生十二倍频[Optics&Laser Technology,2011,43(7):1167-1171]。Compared with multi-octave mmWave signal generation schemes such as quadruple, sextuple, octal, decade, or twelve-octave, the twenty-octave scheme can generate higher-frequency mmWave signals or further reduce The need for modulator bandwidth. The reported methods for generating multi-frequency optical carrier millimeter waves include integrated modulator method to generate octave frequency [Acta Optics Sinica, 2014, 4(3): 0306004-1-8], modulator + stimulated Brillouin scattering method Generate tenfold frequency [Optoelectronics Laser, 2015,35(4):695-699], cascade modulator + fiber grating method to generate twelvefold frequency [Optics & Laser Technology, 2011,43(7):1167-1171].
然而，上述产生多倍频光载毫米波的方法存在一些不足。八倍频集成调制器法能产生的毫米波频率有限。十倍频和十二倍频法采用受激布里渊散射效应或光纤光栅，实质上都需要使用额外光器件的滤波功能来抑制不需要的光边带，但这样又会妨碍这些方法在波分复用WDM-RoF系统和上变频系统中的应用，也增加了系统的复杂程度并限制了其在整个毫米波段的可调谐性。However, there are some shortcomings in the above-mentioned methods for generating multi-frequency optically carried mmWave. The millimeter-wave frequency that can be generated by the eight-fold integrated modulator method is limited. The decadal and doubling frequency methods use the stimulated Brillouin scattering effect or fiber gratings, which essentially need to use the filtering function of additional optical devices to suppress the unwanted optical sidebands, but this will hinder these methods in the wave The application of division multiplexing WDM-RoF system and up-conversion system also increases the complexity of the system and limits its tunability in the entire millimeter wave band.
发明内容Contents of the invention
1、发明目的。1. The purpose of the invention.
本发明提供一种无需光滤波器即能产生二十倍频光载毫米波的方法和装置。The invention provides a method and device capable of generating twenty-fold frequency optical-carried millimeter waves without an optical filter.
2、本发明所采用的技术方案。2. The technical scheme adopted in the present invention.
本发明公开了一种基于嵌套马赫-曾德尔调制器的二十倍频光载毫米波装置，包括激光器、射频信号发生器、嵌套调制器、移相器、光电探测器；The invention discloses a twenty-fold frequency optical carrier millimeter-wave device based on a nested Mach-Zehnder modulator, including a laser, a radio frequency signal generator, a nested modulator, a phase shifter, and a photoelectric detector;
激光器发出的光波经过嵌套调制器被射频信号调制，嵌套调制器的上下两臂分别由两个级联的MZM子调制器构成，这四个子调制器都偏置在最小输出点；嵌套调制器上下两臂级联MZM调制器之间的射频驱动信号的相位差都为π/2，每个子调制器两臂射频驱动信号之间的相位差都为π，由移相器实现；嵌套调制器的上臂和下臂分别输出的上下两路信号都会生成4k+2(k＝0,±1,±2…)阶边带，通过设置调制指数m，使幅度正比于2阶贝塞尔函数的2阶边带为零，则上下两路信号相加产生(±6,±10…)阶边带；设置嵌套调制器上下两臂的射频驱动信号之间的相位差为π/6，使输出的6阶边带因相位相反相加为零，则输出主要为10阶边带，而其它高于10阶的4k+2阶边带幅度很小可忽略；经过光纤传输后正10阶边带和负10阶边带在光电探测器PD拍频产生二十倍频毫米波信号。The light wave emitted by the laser is modulated by the radio frequency signal through the nested modulator. The upper and lower arms of the nested modulator are respectively composed of two cascaded MZM sub-modulators, and these four sub-modulators are biased at the minimum output point; the nested modulator The phase difference of the RF drive signals between the upper and lower arms of the modulator cascaded MZM modulator is π/2, and the phase difference between the RF drive signals of the two arms of each sub-modulator is π, which is realized by a phase shifter; embedding The upper and lower signals output by the upper arm and the lower arm of the set of modulators will generate 4k+2 (k=0,±1,±2…) order sidebands, and by setting the modulation index m, the amplitude is proportional to the 2nd order Bessel Carr function If the 2nd order sideband is zero, then the upper and lower signals are added to generate (±6,±10…) order sidebands; set the phase difference between the RF drive signals of the upper and lower arms of the nested modulator to π/6, Make the output 6th-order sidebands add to zero due to the opposite phase, then the output is mainly 10th-order sidebands, while other 4k+2-order sidebands higher than 10th-order have a small amplitude and can be ignored; after optical fiber transmission, the positive 10th-order The sidebands and negative 10th order sidebands generate a twenty-fold millimeter-wave signal at the beat frequency of the photodetector PD.
更进一步，嵌套调制器为并行级联马赫-曾德尔调制器。Furthermore, the nested modulators are parallel cascaded Mach-Zehnder modulators.
更进一步，所述的通过设置的调制指数，即使即m＝5.953。Furthermore, by setting the modulation index, even That is, m=5.953.
本发明公开了一种基于嵌套马赫-曾德尔调制器的二十倍频光载毫米波产生方法，激光器发出的光波经过嵌套调制器被射频信号调制，嵌套调制器的上下两臂分别由两个级联的MZM子调制器构成，这四个MZM子调制器都偏置在最小输出点；嵌套调制器上下两臂级联MZM调制器之间的射频驱动信号的相位差都为π/2，每个子调制器两臂射频驱动信号之间的相位差都为π，由移相器实现；嵌套调制器的上下两臂输出的上下两路信号相加会生成4k+2(k＝0,±1,±2…)阶边带，主要包括±2,±6和±10阶边带，而其它高于10阶的4k+2阶分量幅度很小可忽略；The invention discloses a method for generating a twenty-fold frequency-multiplied optical-carrying millimeter wave based on a nested Mach-Zehnder modulator. The light wave emitted by the laser is modulated by a radio frequency signal through the nested modulator, and the upper and lower arms of the nested modulator are respectively It consists of two cascaded MZM sub-modulators, and these four MZM sub-modulators are all biased at the minimum output point; the phase difference of the RF driving signal between the upper and lower arms of the nested modulator cascaded MZM modulators is π/2, the phase difference between the RF drive signals of the two arms of each sub-modulator is π, which is realized by a phase shifter; the addition of the upper and lower signals output by the upper and lower arms of the nested modulator will generate 4k+2( k=0, ±1, ±2...) order sidebands, mainly including ±2, ±6 and ±10th order sidebands, while other 4k+2 order components higher than 10th order are negligible in magnitude;
2阶边带的幅度正比于2阶贝塞尔函数m为调制指数，通过设置合适的调制指数，使设置嵌套调制器上下两臂的射频驱动信号之间的相位差为π/6，使上臂输出的6阶边带和下臂输出的6阶边带相位相反，两者相加时互相抵消而为零；当2阶边带为零并且上下两路信号的6阶边带相加互相抵消时，经过光纤传输后正10阶边带和负10阶边带在光电探测器PD拍频产生二十倍频毫米波信号。The magnitude of the 2nd order sideband is proportional to the 2nd order Bessel function m is the modulation index, by setting the appropriate modulation index, make Set the phase difference between the RF drive signals of the upper and lower arms of the nested modulator to π/6, so that the phases of the 6th-order sideband output by the upper arm and the 6th-order sideband output by the lower arm are opposite, and when the two are added together, they cancel each other out. is zero; when the 2nd-order sideband is zero and the 6th-order sidebands of the upper and lower signals cancel each other out, the positive 10th-order sideband and negative 10th-order sideband will generate two Decade millimeter wave signal.
更进一步，输入光波经过嵌套调制器被频率为ωm的射频信号调制，嵌套调制器两臂输出的上下两路信号可分别表示为：Going a step further, the input light wave After the nested modulator is modulated by a radio frequency signal with frequency ωm , the upper and lower signals output by the two arms of the nested modulator can be expressed as:
式中，m＝πVm/Vπ是MZM子调制器的调制指数，Vm是射频信号的振幅，Vπ是MZM子调制器的半波电压，是嵌套调制器上下两臂射频驱动信号之间的相位差；In the formula, m=πV m /V π is the modulation index of the MZM sub-modulator, V m is the amplitude of the radio frequency signal, V π is the half-wave voltage of the MZM sub-modulator, is the phase difference between the RF drive signals of the upper and lower arms of the nested modulator;
上下两路信号相加可得嵌套调制器的输出为：The output of the nested modulator can be obtained by adding the upper and lower signals:
输出为4k+2(k＝0,±1,±2…)阶边带，调节调制指数m使可消除2阶边带，其中m＝5.953，因嵌套调制器上下两臂射频驱动信号之间的相位差而使上下两路6阶边带相位相反相加为零(1+ej(4k+2)π/6＝0,4k+2＝±6)，而其它高于10阶的4k+2阶分量幅度很小可忽略，故嵌套调制器的输出可以简化为：The output is 4k+2 (k=0,±1,±2…) order sidebands, adjust the modulation index m to make The second-order sideband can be eliminated, where m=5.953, due to the phase difference between the RF drive signals of the upper and lower arms of the nested modulator The upper and lower 6th-order sideband phases are reversed and added to zero (1+e j(4k+2)π/6 = 0,4k+2=±6), while other 4k+2-order higher than 10-order The magnitude of the component is negligibly small, so the output of the nested modulator can be simplified as:
输出频率分别为10ωm和-10ωm的±10阶边带，由于光电探测器PD采用平方律探测，正10阶边带和负10阶边会拍频产生二十倍频毫米波信号。The output frequencies are ±10th-order sidebands of 10ω m and -10ωm respectively. Since the photodetector PD adopts square law detection, the positive 10th-order sideband and negative 10th-order sideband will beat to generate a twenty-fold frequency millimeter wave signal.
3、本发明所产生的技术效果。3. The technical effects produced by the present invention.
(1)本发明能产生二十倍频的光载毫米波，可以降低对射频器件和调制器带宽的要求，如仅需5GHz的射频信号发生器和带宽为5GHz的调制器就可产生100GHz的毫米波。(1) The present invention can produce the light-carrying millimeter wave of 20 times frequency, can reduce the requirement to the bandwidth of radio frequency device and modulator, just can produce 100GHz as only the radio frequency signal generator of 5GHz and the modulator of bandwidth are 5GHz millimeter wave.
(2)本发明无需光滤波器也能产生高质量光载毫米波，其光边带抑制比OSSR和射频边带抑制比分别为33dB和28dB，在整个毫米波段的具有可调谐性且系统稳定容易实现，还能应用于WDM-RoF波分复用光纤无线通信系统和上变频系统。(2) The present invention can generate high-quality light-carrying millimeter waves without optical filters, and its optical sideband suppression ratio OSSR and radio frequency sideband suppression ratio are 33dB and 28dB respectively, and it has tunability and stable system in the whole millimeter wave band It is easy to implement, and can also be applied to WDM-RoF wavelength division multiplexing optical fiber wireless communication systems and frequency up conversion systems.
附图说明Description of drawings
图1为本发明的原理结构图。Fig. 1 is a schematic structure diagram of the present invention.
具体实施方式Detailed ways
实施例Example
本发明提出的一种产生二十倍频光载毫米波的方法，包括激光器1、射频信号发生器2、移相器3、嵌套调制器4、光电探测器5。可以采用光谱分析仪和频谱分析仪分别测量信号的光边带抑制比和射频边带抑制比从而测试所产生的二十倍频光载毫米波的性能。A method for generating a twenty-fold frequency-multiplied optical-carrying millimeter wave proposed by the present invention includes a laser 1 , a radio frequency signal generator 2 , a phase shifter 3 , a nested modulator 4 , and a photoelectric detector 5 . A spectrum analyzer and a spectrum analyzer can be used to measure the optical sideband suppression ratio and the radio frequency sideband suppression ratio of the signal respectively, so as to test the performance of the generated twenty-fold frequency optical carrier millimeter wave.
二十倍频光载毫米波产生的具体方法和步骤如下：The specific method and steps for generating twenty-fold frequency optical-carrying millimeter waves are as follows:
激光二极管LD发出的光波经过嵌套调制器被射频信号调制，嵌套调制器的上下两臂分别由两个级联的MZM子调制器构成，这四个子调制器都偏置在最小输出点；嵌套调制器上下两臂级联MZM调制器之间的射频驱动信号的相位差都为π/2，每个子调制器两臂射频驱动信号之间的相位差都为π，嵌套调制器上下两臂射频驱动信号之间的相位差为π/6，由移相器实现；The light wave emitted by the laser diode LD is modulated by the radio frequency signal through the nested modulator. The upper and lower arms of the nested modulator are respectively composed of two cascaded MZM sub-modulators, and these four sub-modulators are all biased at the minimum output point; The phase difference of the RF driving signals between the upper and lower arms of the nested modulator cascaded MZM modulators is π/2, and the phase difference between the RF driving signals of the two arms of each sub-modulator is π, and the upper and lower arms of the nested modulator The phase difference between the RF drive signals of the two arms is π/6, which is realized by a phase shifter;
嵌套调制器上下两臂分别输出的上下两路信号都会生成4k+2(k＝0,±1,±2…)阶边带，通过设置合适的调制指数m，使幅度正比于2阶贝塞尔函数的2阶边带为零，则上下两路信号相加产生(±6,±10…)阶边带；设置嵌套调制器上下两臂射频驱动信号之间的相位差为π/6，使上臂输出的6阶边带和下臂输出的6阶边带相位相反，两者相加时互相抵消而为零；此时输出主要为10阶边带，而其它高于10阶的4k+2阶边带幅度很小可忽略，产生的光载毫米波的光边带抑制比为33dB。经过光纤传输后正10阶边带和负10阶边带在光电探测器PD拍频产生二十倍频毫米波信号，该毫米波信号的射频边带抑制比为28dB。The upper and lower signals respectively output by the upper and lower arms of the nested modulator will generate 4k+2 (k=0,±1,±2…) order sidebands. By setting an appropriate modulation index m, the amplitude is proportional to the 2nd order bei Searle function The second-order sideband of the nested modulator is zero, then the upper and lower signals are added to generate (±6,±10…) order sidebands; set the phase difference between the RF drive signals of the upper and lower arms of the nested modulator to π/6, so that The phases of the 6th-order sideband output by the upper arm and the 6th-order sideband output by the lower arm are opposite, and when the two are added together, they cancel each other out and become zero; at this time, the output is mainly the 10th-order sideband, while other 4k+2 The magnitude of the order sideband is negligibly small, and the optical sideband suppression ratio of the optically carried millimeter wave is 33dB. After optical fiber transmission, the positive 10th-order sideband and negative 10th-order sideband generate a twenty-fold frequency millimeter-wave signal at the beat frequency of the photodetector PD, and the radio frequency sideband suppression ratio of the millimeter-wave signal is 28dB.
原理：principle:
输入光波经过嵌套调制器被频率为ωm的射频信号调制，嵌套调制器两臂输出的上下两路信号可分别表示为：input light wave After the nested modulator is modulated by a radio frequency signal with frequency ωm , the upper and lower signals output by the two arms of the nested modulator can be expressed as:
式中，m＝πVm/Vπ是MZM子调制器的调制指数，Vm是射频信号的振幅，Vπ是MZM子调制器的半波电压，是嵌套调制器上下两臂射频驱动信号之间的相位差；In the formula, m=πV m /V π is the modulation index of the MZM sub-modulator, V m is the amplitude of the radio frequency signal, V π is the half-wave voltage of the MZM sub-modulator, is the phase difference between the RF drive signals of the upper and lower arms of the nested modulator;
上下两路信号相加可得嵌套调制器的输出为：The output of the nested modulator can be obtained by adding the upper and lower signals:
输出为4k+2(k＝0,±1,±2…)阶边带，调节调制指数m使可消除2阶边带，其中m＝5.953，因嵌套调制器上下两臂射频驱动信号之间的相位差而使上下两路6阶边带相位相反相加为零(1+ej(4k+2)π/6＝0,4k+2＝±6)，而其它高于10阶的4k+2阶分量幅度很小可忽略，故嵌套调制器的输出可以简化为：The output is 4k+2 (k=0,±1,±2…) order sidebands, adjust the modulation index m to make The second-order sideband can be eliminated, where m=5.953, due to the phase difference between the RF drive signals of the upper and lower arms of the nested modulator The upper and lower 6th-order sideband phases are reversed and added to zero (1+e j(4k+2)π/6 = 0,4k+2=±6), while other 4k+2-order higher than 10-order The magnitude of the component is negligibly small, so the output of the nested modulator can be simplified as:
输出频率分别为10ωm和-10ωm的±10阶边带，由于光电探测器PD采用平方律探测，正10阶边带和负10阶边会拍频产生二十倍频毫米波信号。The output frequencies are ±10th-order sidebands of 10ω m and -10ωm respectively. Since the photodetector PD adopts square law detection, the positive 10th-order sideband and negative 10th-order sideband will beat to generate a twenty-fold frequency millimeter wave signal.
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.
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| IT202200024354A1 (en) * | 2022-11-25 | 2024-05-25 | Univ Degli Studi Padova | METHOD AND DEVICE FOR MODULATION OF PHOTONIC PULSE |
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| IT202200024354A1 (en) * | 2022-11-25 | 2024-05-25 | Univ Degli Studi Padova | METHOD AND DEVICE FOR MODULATION OF PHOTONIC PULSE |
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