光電反饋下1550nm-VCSELs的偏振轉(zhuǎn)換及非線性動力學(xué)特性研究
發(fā)布時間：2019-06-02 10:18
【摘要】：相比常規(guī)的邊發(fā)射半導(dǎo)體激光器(EELs),垂直腔表面發(fā)射激光器(VCSELs)具有閾值電流極低、體積較小、可輸出單縱模光、遠(yuǎn)場發(fā)散角小、易于大規(guī)模集成、易與光纖耦合等優(yōu)點。VCSELs相對較弱的各項異性和圓形輸出端口特點使其輸出光的偏振方向可以選取在相互正交的X方向或Y方向(X偏振模式或Y偏振模式),同時VCSELs在外部光電反饋的作用下可以輸出較為復(fù)雜的動力學(xué)行為。目前,有關(guān)光電反饋作用下VCSLEs的偏振轉(zhuǎn)換特性和非線性動力學(xué)特性的實驗和理論研究已有不少的報道,但是這些研究主要集中于短波長區(qū)域,而對于波長處于1310nm-1550nm的長波長VCSELs的研究還非常匱乏。由于1550nm-VCSELs的激射波長主要位于光纖的低損耗和零色散窗口,這在高速長距離信息傳輸領(lǐng)域有十分廣闊的應(yīng)用前景。本文基于自旋反轉(zhuǎn)模型,對1550nm-VCSEL在光電反饋下的偏振轉(zhuǎn)換及非線性動力學(xué)特性進(jìn)行了理論與實驗的研究。研究結(jié)果表明：在光電負(fù)反饋作用下1550nm-VCSEL隨著反饋強度和反饋延遲時間的變化呈現(xiàn)出復(fù)雜的偏振轉(zhuǎn)換特性。隨著反饋強度的增大,1550nm-VCSEL的兩偏振模式競爭越來越激烈,并且兩模競爭的區(qū)域向更小的注入電流移動,當(dāng)反饋強度增大到一定程度時,激光器的偏振轉(zhuǎn)換特性就會消失,激光器的Y偏振模式在整個注入電流范圍內(nèi)被完全抑制；隨著反饋延遲時間的增大,1550nm-VCSEL的兩偏振模競爭首先越來越激烈,隨后又開始慢慢減弱,直到最后趨于穩(wěn)定。同時,在光電正反饋下1550nm-VCSEL隨著反饋延遲時間的增大可以輸出非常豐富的非線性動力學(xué)特性,其輸出經(jīng)歷規(guī)則脈沖、準(zhǔn)周期脈沖,混沌脈沖這一準(zhǔn)周期路徑進(jìn)入混沌狀態(tài),并在實驗上對這些狀態(tài)和準(zhǔn)周期路徑進(jìn)行了驗證。本文的研究不僅有助于理解混沌通信模塊中1550nm-VCSELs受到外部光電反饋影響下的輸出狀態(tài)及特性,而且本文的工作在某些需要調(diào)控使1550nm-VCSELs工作在特定動力學(xué)狀態(tài)的應(yīng)用領(lǐng)域中有重要的理論和實踐價值。
[Abstract]:Compared with the conventional edge-emitting semiconductor laser (EELs), vertical cavity surface emitting laser (VCSELs) has the advantages of very low threshold current, small volume, single longitudinal mode light output, small far-field divergence angle and easy large-scale integration. The advantages of easy coupling with optical fiber. VCSELs are relatively weak anisotropy and circular output port characteristics, so that the polarization direction of the output light can be selected in the X direction or Y direction (X polarization mode or Y polarization mode) of the output light. At the same time, VCSELs can output more complex dynamic behavior under the action of external photoelectric feedback. At present, there have been many reports on the experimental and theoretical studies on the polarization conversion and nonlinear dynamic characteristics of VCSLEs under optoelectronic feedback, but these studies mainly focus on the short wavelength region. However, the research on long wavelength VCSELs with wavelength in 1310nm-1550nm is still very scarce. Because the lasing wavelength of 1550nm-VCSELs is mainly located in the low loss and zero dispersion window of optical fiber, it has a very broad application prospect in the field of high speed and long distance information transmission. In this paper, based on the spin inversion model, the polarization conversion and nonlinear dynamic characteristics of 1550nm-VCSEL under optoelectronic feedback are studied theoretically and experimentally. The results show that 1550nm-VCSEL shows complex polarization conversion characteristics with the change of feedback intensity and feedback delay time under the action of photoelectric negative feedback. With the increase of feedback intensity, the competition between two polarization modes of 1550nm-VCSEL becomes more and more intense, and the region of two-mode competition moves to a smaller injection current. When the feedback intensity increases to a certain extent, the polarization conversion characteristics of the laser will disappear. The Y polarization mode of the laser is completely suppressed in the whole injection current range. With the increase of feedback delay time, the competition between the two polarization modes of 1550nm-VCSEL becomes more and more intense at first, and then gradually weakens until it finally tends to be stable. At the same time, with the increase of feedback delay time, 1550nm-VCSEL can output very rich nonlinear dynamic characteristics under photoelectric positive feedback, and its output goes through the quasi-periodic path of regular pulse, quasi-periodic pulse and chaotic pulse into chaotic state. These states and quasi-periodic paths are verified by experiments. The research in this paper is not only helpful to understand the output state and characteristics of 1550nm-VCSELs under the influence of external photoelectric feedback in chaotic communication module. Moreover, the work of this paper has important theoretical and practical value in some applications that need to be regulated to make 1550nm-VCSELs work in specific dynamic states.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248.4
本文編號：2491019
[Abstract]:Compared with the conventional edge-emitting semiconductor laser (EELs), vertical cavity surface emitting laser (VCSELs) has the advantages of very low threshold current, small volume, single longitudinal mode light output, small far-field divergence angle and easy large-scale integration. The advantages of easy coupling with optical fiber. VCSELs are relatively weak anisotropy and circular output port characteristics, so that the polarization direction of the output light can be selected in the X direction or Y direction (X polarization mode or Y polarization mode) of the output light. At the same time, VCSELs can output more complex dynamic behavior under the action of external photoelectric feedback. At present, there have been many reports on the experimental and theoretical studies on the polarization conversion and nonlinear dynamic characteristics of VCSLEs under optoelectronic feedback, but these studies mainly focus on the short wavelength region. However, the research on long wavelength VCSELs with wavelength in 1310nm-1550nm is still very scarce. Because the lasing wavelength of 1550nm-VCSELs is mainly located in the low loss and zero dispersion window of optical fiber, it has a very broad application prospect in the field of high speed and long distance information transmission. In this paper, based on the spin inversion model, the polarization conversion and nonlinear dynamic characteristics of 1550nm-VCSEL under optoelectronic feedback are studied theoretically and experimentally. The results show that 1550nm-VCSEL shows complex polarization conversion characteristics with the change of feedback intensity and feedback delay time under the action of photoelectric negative feedback. With the increase of feedback intensity, the competition between two polarization modes of 1550nm-VCSEL becomes more and more intense, and the region of two-mode competition moves to a smaller injection current. When the feedback intensity increases to a certain extent, the polarization conversion characteristics of the laser will disappear. The Y polarization mode of the laser is completely suppressed in the whole injection current range. With the increase of feedback delay time, the competition between the two polarization modes of 1550nm-VCSEL becomes more and more intense at first, and then gradually weakens until it finally tends to be stable. At the same time, with the increase of feedback delay time, 1550nm-VCSEL can output very rich nonlinear dynamic characteristics under photoelectric positive feedback, and its output goes through the quasi-periodic path of regular pulse, quasi-periodic pulse and chaotic pulse into chaotic state. These states and quasi-periodic paths are verified by experiments. The research in this paper is not only helpful to understand the output state and characteristics of 1550nm-VCSELs under the influence of external photoelectric feedback in chaotic communication module. Moreover, the work of this paper has important theoretical and practical value in some applications that need to be regulated to make 1550nm-VCSELs work in specific dynamic states.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248.4
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 楊炳星;夏光瓊;林曉東;吳正茂;;光脈沖注入下VCSEL的偏振開關(guān)特性[J];物理學(xué)報;2009年03期
，本文編號：2491019
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