本文選題：微波光子技術 + 外調制器　； 參考：《南京大學》2016年博士論文

【摘要】：微波光子學是一門交叉學科,研究的主要問題是在光域里產生、處理和傳輸微波信號。微波光子學的應用領域包括光載無線通信系統、雷達系統、光信號處理、傳感等領域。因為光學器件具有大帶寬、重量輕、高可調性和重構性和抗電磁干擾等優(yōu)點,微波光子技術被認為能夠有效地克服“電子瓶頸“問題。本論文基于各種外調制器提出了幾個微波光子系統解決了微波信號的產生、傳輸和處理上的一些問題。另外,本論文還將微波光子技術應用在了多縱模光纖激光器傳感器上。本論文的主要工作如下：1.我們提出了一種基于DFB激光器的光學相位共軛變換器(OPC)用來補償微波光子鏈路中的色散。DFB激光器提供了OPC中的泵浦光源同時自身也是可以引發(fā)四波混頻(FWM)的介質。相比于基于半導體光放大器和色散位移光纖的OPC,我們提供了一個集成度更高的方案。實驗結果顯示,通過這種OPC,50.4 km的微波光子鏈路中的色散被補償并且補償帶寬高達33 GHz,無雜散動態(tài)范圍(SFDR)也提高了12.6dB·Hz2/3。在微波光子鏈路中的色散點9.2 GHz處,125 Mb/s幅移鍵控信號的傳輸性能也得到了提高。2.我們提出了一種基于光電振蕩器(OEO)的全占空比三角波發(fā)生器。OEO的振蕩頻率決定了三角波脈沖的重復頻率。通過將OEO中的馬赫曾德調制器(MZM)偏置在正交點,OEO的小信號增益最大化同時產生的偶次諧波被抑制。通過精確控制OEO的小信號增益,使得基波的幅度是三次諧波幅度的9倍。在光電探測器(PD)產生的電信號經過一個90度移相器之后就能夠產生三角波脈沖。實驗中OEO的頻率可以從2 GHz調諧到10 GHz,OEO的相位噪聲在10 kHz處為-101.7 dBc/Hz。我們也測試了重復頻率為3 GHz和6 GHz的三角波,它們與理想三角波的均方根誤差分別為6.4927e-4和9.0932e-4。3.基于偏振調制器和雙偏振調制器,我們提出了一種新型的微波頻移鍵控(FSK)發(fā)生器。其中偏振調制器用來調制輸入線偏振光的偏振態(tài),使得輸出光的偏振態(tài)在兩個正交方向切換,也就是產生了偏振鍵控(PolSK)信號。雙偏振調制器由偏振復用的兩個子MZM組成。這兩個子MZM被分別加上了頻率不同的微波信號。偏振調制器產生的PolSK信號送入雙偏振調制器,通過偏振控制器將PolSK的軸對準雙偏振調制器的主軸,PolSK信號就能被轉換成微波FSK信號。實驗上我們將子MZM偏置在正交點并分別加上了3 GHz和6.5 GHz的信號,得到了載頻為3/6.5 GHz比特率為1.25 Gb/s的FSK信號并且傳輸了10 km。另外我們還將MZM偏置在了最小傳輸點,得到了抑制載波的FSK信號。這種信號能夠克服因光纖產生的微波功率衰減效應并且能夠實現載頻倍頻。當加在MZM上的微波信號的頻率是3/7 GHz時,我們得到了倍頻的載頻為6/14 GHz并且比特率為2.5 Gb/s的FSK信號。4.我們提出了一種有多個可調獨立通帶的微波光子濾波器(MPF)。使用的光源是自發(fā)輻射的寬譜光源并被一個耦合器分成N路。其中1路被送入相位調制器另外N-1路被光延時線延時。這N路分支被合路之后再送入色散補償光纖然后在PD上進行光電轉換。每一路延時的寬譜光與相位調制器產生的寬譜邊帶進行拍頻就能產生出MPF的一個通帶。通過調諧寬譜光的延時,通帶的中心波長就能夠得到調諧。在實驗上我們演示了兩個獨立可調的通帶,這兩個通帶能夠獨立地從DC調諧到30 GHz,通帶3 dB帶寬為250 MHz。我們也測試了MPF的穩(wěn)定性。在1.5小時之內,當第一個通帶的中心頻率是8 GHz時,它的中心頻率和強度的變化分別為31 MHz和0.4 dB；當第二個通帶的中心頻率在14 GHz時,它的中心頻率和強度的變化分別為37 MHz和0.34 dB。另外我們還測試了MPF的SFDR。實驗結果顯示中心頻率為1 GHz和4 GHz的通帶的SFDR分別為73.5 dB·Hz2/3和73 dB-Hz2/3.5.我們對一種基于相移光纖光柵(PS-FBG)的單通帶MPF進行了線性化。當一個相位調制的雙邊帶(DSB)信號被送入PS-FBG時,如果一個邊帶落入PS-FBG反射帶的透射缺口,從PS-FBG反射的信號就會轉化成強度調制的單邊帶(SSB)信號,從而產生MPF的一個通帶。通過調諧光載波的波長,通帶的中心頻率就能隨之調諧。通過利用鈮酸鋰相位調制器中的雙折射效應和偏振分集接收機,我們提高了這種MPF的SFDR。實驗結果單通帶MPF的通帶寬度為80 MHz,調諧范圍為5.5 GHz。SFDR被提高了13.1 dB。6.基于雙平行馬赫曾德調制器(DPMZM)和數字信號處理算法,我們提出并驗證了一種具有高轉換效率和高SFDR的微波光子混頻器。射頻信號和中頻信號分別加在DPMZM里的兩個平行的MZM上,使得射頻和中頻的隔離度趨近于無窮。當DPMZM的三個偏置都偏置在最小傳輸點時,光載波就能得到極大地抑制。因此對于PD來說,相同的輸入光功率條件下能夠產生更大的中頻信號,因此轉換效率就得到了提高。初步的實驗顯示轉換效率最高能達到-12.7 dB。另一方面,我們提出一種簡單的DSP算法提高了混頻器的SFDR。這種算法不需要通常DSP算法所需要的系統的精確參數而只需要知道本振信號的調制深度。在實驗上,通過該算法,混頻器的SFDR從101.5dB·Hz2/3提高到了114.5 dB·Hz4/5。7.我們提出了一個多縱模光纖激光器傳感器的復用方案。通過在光纖激光器諧振腔中插入兩個匹配的波分復用器(WDM)和一個半導體光放大器,實現了激光器的多波長激射。對應于每一個WDM通道都產生了一個波長,并且由于WDM通道的帶寬遠大于縱模的自由譜程(FSR),因此每一個波長都含有多個縱模。我們在兩個WDM之間的光纖上加上傳感量。將激光器的多波長輸出送入波分解復用器(DeWDM)將波長分開之后分別送入一個PD進行拍頻解調就能解調出傳感信號。一個初步的實驗復用了一個應變傳感器和一個溫度傳感器。
[Abstract]:Microwave photonics is a cross discipline. The main problem is to produce and transmit microwave signals in the optical domain. The applications of microwave photonics include optical wireless communication systems, radar systems, light signal processing, sensing and other fields. The optical devices have wide bandwidth, light weight, high tunability, reconfiguration and anti electromagnetic drying. The microwave photon technology is considered to be able to overcome the "electronic bottleneck" problem effectively. Based on various external modulators, several microwave photonic systems have been proposed to solve the problems of microwave signal generation, transmission and processing. In addition, the microwave photons are applied to the multi longitudinal mode fiber laser sensing in this paper. The main work of this paper is as follows: 1. we propose an optical phase conjugate converter based on DFB laser (OPC) to compensate for the dispersion.DFB laser in the microwave photonic link to provide the pump source in the OPC and the medium that can also cause the four wave mixing (FWM), compared to the semiconductor optical amplifier and the optical amplifier. The OPC of the dispersion shifted fiber provides a more integrated scheme. The experimental results show that the dispersion in the 50.4 km microwave photonic link is compensated and the compensation bandwidth is up to 33 GHz through this OPC, and the non stray dynamic range (SFDR) also improves the 12.6dB Hz2/3. dispersion point 9.2 GHz, 125 Mb/s amplitude in the microwave photonic link. The transmission performance of the shift keying signal has also been improved by.2.. We propose a total duty ratio triangular wave generator based on the optoelectronic oscillator (OEO), which determines the repetition frequency of the triangular wave pulse. By offset the Maher Ceng De modulator (MZM) in the OEO at the positive point, the small signal gain of the OEO is maximized simultaneously. The even subharmonic is suppressed. The amplitude of the base wave is 9 times the amplitude of the three harmonic by precisely controlling the small signal gain of the OEO. The electrical signal generated by the photodetector (PD) can produce a triangular wave pulse after a 90 degree phase shifter. In the experiment, the frequency of the OEO can be tuned from 2 GHz to 10 GHz, and the phase noise of OEO is at 10 kHz. -101.7 dBc/Hz. we also tested the trigonometric waves with repeated frequencies of 3 GHz and 6 GHz, and their root mean square errors with ideal triangular waves are 6.4927e-4 and 9.0932e-4.3. based on polarization modulator and dual polarization modulator. We propose a new type of microwave frequency shift keying (FSK) generator, in which the polarization modulator is used to modulate the input line bias. The polarization state of the light makes the polarization state of the output light switch in two orthogonal directions, that is, the polarization keying (PolSK) signal is produced. The dual polarization modulator consists of two sub MZM of polarization multiplexing. The two sub MZM are separately added to the different frequency microwave signals. The PolSK signals produced by the polarizer are sent to the dual polarization modulator. The over polarization controller aligns the axis of PolSK with the spindle of the dual polarization modulator, and the PolSK signal can be converted into a microwave FSK signal. In the experiment we offset the sub MZM at the positive point and add 3 GHz and 6.5 GHz signals respectively, and the FSK signal with a 3/6.5 GHz bit rate of 1.25 Gb/s is obtained and the 10 km. is transmitted. In addition, we will also MZM the MZM. It is biased at the minimum transmission point and gets the FSK signal to suppress the carrier. This signal can overcome the microwave power attenuation effect caused by the fiber and can achieve carrier frequency doubling. When the frequency of the microwave signal added to the MZM is 3/7 GHz, we get the FSK signal.4. with a frequency multiplier of 6/14 GHz and a bit rate of 2.5 Gb/s. We have proposed a microwave photon filter (MPF) with multiple adjustable independent passbands. The light source used is a broad spectrum source of spontaneous radiation and is divided into a N path by a coupler. 1 of them are sent into the phase modulator and the N-1 road is delayed by the optical delay line. The branch of the N road is then sent to the dispersion compensated fiber and then on the PD. Electrical conversion. A wide spectral band of wide spectral light generated by each time delay and a phase modulator produced by the phase modulator can produce a passband of the MPF. By tuning the delay of the broad spectrum light, the central wavelength of the passband can be tuned. In the experiment we demonstrate two independent tunable passbands, which can be tuned from DC to 30 G independently. Hz, with a band 3 dB bandwidth of 250 MHz., we also tested the stability of MPF. Within 1.5 hours, when the central frequency of the first pass is 8 GHz, its central frequency and strength changes are 31 MHz and 0.4 dB, respectively, when the central frequency of the second passband is 14 GHz, the changes in the center frequency and intensity are 37 MHz and 0.34 dB. respectively. In addition, we also tested the SFDR. experimental results of MPF showing that the SFDR of a passband with a center frequency of 1 GHz and 4 GHz is 73.5 dB. Hz2/3 and 73 dB-Hz2/3.5., respectively. We linearize a single pass band MPF based on phase shift fiber Bragg grating (PS-FBG). Falling into the transmission gap of the PS-FBG reflector, the signal reflected from the PS-FBG will be converted into a intensity modulated single band (SSB) signal, thus producing a passband of the MPF. By tuning the wavelength of the optical carrier, the central frequency of the passband can be tuned accordingly. By using the birefringence effect and polarization diversity receiver in the lithium niobate phase regulator, I We improved the MPF's SFDR. experiment results with the band width of 80 MHz, and the tuning range of 5.5 GHz.SFDR was improved by 13.1 dB.6. based on the dual parallel Maher Ceng De modulator (DPMZM) and digital signal processing algorithm. We proposed and verified a microwave photonic mixer with high conversion efficiency and high SFDR. If the intermediate frequency signals are added to the two parallel MZM in the DPMZM, the isolation of the radio frequency and intermediate frequency is close to infinity. When the three biases of the DPMZM are biased at the minimum transmission point, the optical carrier can be greatly suppressed. Therefore, for the PD, the same input light power can produce a larger intermediate frequency signal, thus conversion. Efficiency is improved. Preliminary experiments show that the maximum conversion efficiency can reach -12.7 dB. on the other hand, we propose a simple DSP algorithm to improve the mixer's SFDR., which does not require the exact parameters of the system required by the usual DSP algorithm but only needs to know the modulation depth of the signal signal. The method, the SFDR of the mixer is improved from 101.5dB to Hz2/3 to 114.5 dB. Hz4/5.7.. We put forward a multiplexing scheme of multi longitudinal mode fiber laser sensor. By inserting two matched wave division multiplexers (WDM) and a semiconductor optical amplifier in the resonator of the fiber laser, the laser multi wavelength lasing is realized. Each WDM channel produces a wavelength, and because the bandwidth of the WDM channel is much larger than the free spectrum of the longitudinal mode (FSR), each wavelength contains multiple longitudinal modes. We add the sense of upload to the fiber between two WDM. The multiwavelength output of the laser is sent to the wave decomposition reagent (DeWDM) and the wavelength is separated into a P respectively. D can demodulate the sensing signal by beat frequency demodulation. A preliminary experiment multiplexed a strain sensor and a temperature sensor.
【學位授予單位】：南京大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN015

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