本文選題：1550　切入點(diǎn)：nm-VCSEL　出處：《西南大學(xué)》2017年碩士論文

【摘要】：光載無(wú)線通信(Radio-over-Fiber,RoF)技術(shù)是將無(wú)線通信與光纖通信有效結(jié)合的一種新興通信技術(shù),而光子微波的獲取技術(shù)是其領(lǐng)域的研究熱點(diǎn)。在眾多的光子微波獲取方案中,基于光注入邊發(fā)射半導(dǎo)體激光器(Edge Emitting Semiconductor Lasers,EESLs)呈現(xiàn)的單周期振蕩獲取光子微波的方案受到額外關(guān)注。采用該方案所產(chǎn)生的微波信號(hào)具有頻率可調(diào)諧、光譜具有單邊帶結(jié)構(gòu)等優(yōu)勢(shì),但微波信號(hào)的線寬比較寬,需進(jìn)一步引入頻率穩(wěn)定技術(shù)進(jìn)行窄化。相比于傳統(tǒng)的EESLs而言,垂直腔表面發(fā)射激光器(Vertical-Cavity Surface-Emitting Lasers,VCSELs)具有體積小、閾值低、與光纖易于耦合等優(yōu)勢(shì),因此基于光注入VCSELs獲取微波信號(hào)的方案更具應(yīng)用前景。本文提出了基于平行偏振光注入1550 nm-VCSEL呈現(xiàn)的單周期非線性動(dòng)力學(xué)態(tài)來(lái)獲取光子微波信號(hào),并實(shí)驗(yàn)研究了光電負(fù)反饋的引入對(duì)所產(chǎn)生的微波信號(hào)的特性影響。研究結(jié)果表明:通過(guò)調(diào)節(jié)注入光的注入強(qiáng)度以及注入光的頻率,1550nm-VCSEL在平行偏振光注入下可呈現(xiàn)出注入鎖定(SIL)、單周期(P1)、倍周期(P2)、混沌(CO)多種豐富的動(dòng)力學(xué)狀態(tài);對(duì)于特定的頻率失諧,1550 nm-VCSEL在較大的注入功率范圍內(nèi)均可呈現(xiàn)單周期振蕩,在合適的注入光強(qiáng)度下,平行偏振光注入1550 nm-VCSEL可產(chǎn)生光譜具有單邊帶結(jié)構(gòu)、頻率高于10 GHz的光子微波信號(hào),但由于激光器中存在固有位相噪聲,導(dǎo)致該微波信號(hào)的線寬達(dá)到了幾十MHz量級(jí),影響信號(hào)在通信系統(tǒng)中的長(zhǎng)距離傳輸;進(jìn)一步引入光電負(fù)反饋對(duì)微波信號(hào)線寬進(jìn)行窄化,在選取合適的光電反饋強(qiáng)度后,可將該微波信號(hào)的線寬從無(wú)反饋時(shí)MHz量級(jí)降低至一百多kHz(減小了兩個(gè)數(shù)量級(jí)以上),且信號(hào)的信噪比為40.7dB,其原因是由于光電反饋環(huán)中延時(shí)重復(fù)的微波信號(hào)對(duì)單周期振蕩的鎖定作用;另外,在固定反饋強(qiáng)度與其它的系統(tǒng)參量,只改變注入光的注入功率即可獲得頻率在一定范圍內(nèi)連續(xù)可調(diào)諧的窄線寬微波信號(hào)。
[Abstract]:Optical wireless communication (Radio-over-Fiber, RoF) technology is a new effective communication technology combined with wireless communication and optical fiber communication technology, and the acquisition of photonic microwave is a hot research field. In the numerous photonic microwave acquisition scheme, edge emitting semiconductor laser based on optical injection (Edge Emitting Semiconductor Lasers, EESLs) single cycle oscillation to obtain the photonic microwave scheme is extra attention. With the scheme generated by the microwave signal with frequency tunable, single sideband spectrum has the advantages of the structure, but the linewidth of the microwave signal is wide, should be introduced into the narrow frequency stabilization technology. Compared with the traditional EESLs, the vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Lasers, VCSELs) has the advantages of small volume, low threshold, easy and fiber coupling and other advantages, so based on optical injection by VCSELs The microwave signal scheme is more promising. This article based on the nonlinear dynamics of parallel polarized light injected into single cycle state 1550 nm-VCSEL is to obtain the photonic microwave signal, and introduces the characteristics of the experimental study on the microwave signal generated by the optoelectronic negative feedback effect. The research results show that by adjusting the injection strength and light the injection light frequency, 1550nm-VCSEL can exhibit injection locking in parallel polarized light injection (SIL), single cycle (P1), double period (P2), chaos (CO) dynamic state variety; for a given frequency detuning, 1550 nm-VCSEL in large power range can be injected in a single cycle oscillation. In the suitable injection light intensity, parallel polarized light with 1550 nm-VCSEL can produce a spectrum with single sideband structure, photonic microwave signal frequency is higher than 10 GHz, but because of the inherent position of laser. Phase noise, leading to the width of the microwave signal to the order of tens of MHz, affecting the signal long distance transmission in a communication system; further introducing the optoelectronic negative feedback were narrow linewidth of microwave signal, at the appropriate photoelectric feedback intensity, the microwave signal line width from feedback MHz level decreased to more than 100 kHz (reduced by more than two orders of magnitude), and the signal-to-noise ratio is 40.7dB, which is due to the locking effect of microwave optoelectronic feedback signal delay repeated in the loop on single periodic oscillation; in addition, the fixed feedback intensity and its system parameters, only change the injection light power injection can be obtained continuously narrow linewidth tunable microwave signal in a certain range of frequency.

【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN248;TN929.1

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相關(guān)期刊論文 前4條

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本文編號(hào)：1654314