本文選題：1550 + nm垂直腔面發(fā)射激光器(1550��； 參考：《西南大學(xué)》2017年碩士論文

【摘要】：垂直腔面發(fā)射激光器(VCSELs)作為新型的光電器件,因具有低閾值電流、單縱模輸出、較大的調(diào)制帶寬、發(fā)散角小、與光纖的耦合性好、易于實(shí)現(xiàn)二維陣列等獨(dú)特的優(yōu)勢而備受關(guān)注。特別地,由于VCSELs的特殊結(jié)構(gòu)和有源區(qū)增益介質(zhì)的二向色性和雙折射效應(yīng),自由運(yùn)行的VCSELs可輸出兩個(gè)正交的偏振分量。當(dāng)偏置電流、溫度等條件變化或引入光反饋、光注入等外部擾動(dòng)時(shí),兩偏振分量之間可發(fā)生能量的相互轉(zhuǎn)換,即偏振開關(guān)(polarization switching,PS)。其中,光注入是研究VCSELs PS特性的常用方式,目前的相關(guān)研究主要集中在連續(xù)光注入方式,而對(duì)于脈沖光注入,尤其是雙偏振脈沖光注入下VCSELs PS特性的研究相對(duì)缺乏。特別地,PS時(shí)間涉及信息處理速率及系統(tǒng)的運(yùn)行穩(wěn)定性,因此,研究VCSELs的PS特性對(duì)未來基于VCSELs的全光信息處理系統(tǒng)的發(fā)展具有重要的意義。本文基于自旋反轉(zhuǎn)模型(SFM),理論研究了1550nm VCSEL在雙偏振脈沖光注入(DPPI)下輸出兩個(gè)偏振分量的PS特性。研究結(jié)果表明,與1550nm VCSEL同時(shí)受到一個(gè)正交偏振脈沖光和一個(gè)平行偏振連續(xù)光注入(脈沖正交偏振雙光注入(DIPOP))的情況相比,在合適的參數(shù)條件下,DPPI方式能使PS時(shí)間更短,且其消光比更大。對(duì)于50 MHz的脈沖注入信號(hào),在DPPI方式下,1550nm VCSEL輸出的PS特性會(huì)受到兩個(gè)注入脈沖的切換時(shí)間差值Δt的影響,每一個(gè)偏置電流對(duì)應(yīng)一個(gè)最佳的Δt值,且這個(gè)值隨偏置電流增加而呈現(xiàn)逐漸減小的趨勢。對(duì)于固定的偏置電流、最佳Δt值及頻率失諧,X(Y)偏振輸出的開關(guān)時(shí)間主要取決于偏振脈沖注入強(qiáng)度Einj,x(Einj,y),且X(Y)偏振輸出的開關(guān)時(shí)間隨Einj,x(Einj,y)的增加而變短;對(duì)于固定的注入強(qiáng)度,負(fù)頻率失諧有利于減小X和Y偏振輸出的開關(guān)時(shí)間。因此,通過改變注入強(qiáng)度以及頻率失諧,兩個(gè)偏振輸出的PS開關(guān)時(shí)間都能夠得到有效調(diào)控。此外,我們也給出了1550 nm VCSEL在受到兩個(gè)2.5 Gb/s NRZ信號(hào)注入時(shí)的系統(tǒng)響應(yīng)。
[Abstract]:As a new type of optoelectronic device, Vertical cavity Surface emitting Laser (VCSELs) has attracted much attention because of its advantages such as low threshold current, single longitudinal mode output, large modulation bandwidth, small divergence angle, good coupling with fiber and easy to realize two-dimensional array. In particular, due to the special structure of VCSELs and the dichroism and birefringence of the gain medium in the active region, the free-running VCSELs can output two orthogonal polarization components. When the bias current, temperature and other conditions are changed or the external disturbances such as optical feedback and optical injection are introduced, the energy conversion between the two polarization components can occur, that is, the polarization switching switch (PS). Among them, optical injection is a common way to study the characteristics of VCSELs PS. At present, the related research is mainly focused on the continuous optical injection mode, but the study on the characteristics of pulsed light injection, especially under the dual polarization pulsed light injection, is relatively scarce. In particular, PS time is related to the information processing rate and the stability of the system. Therefore, it is of great significance to study the PS characteristics of VCSELs for the development of all-optical information processing systems based on VCSELs in the future. Based on the spin inversion model (SFM), the PS characteristics of 1550nm VCSEL with two polarization components output under double polarization pulse injection (DPPI) are studied theoretically. The results show that the PS time is shorter under the suitable parameters than that when 1550nm is simultaneously injected by an orthogonal polarized pulse and a parallel polarized continuous optical injection (DIPOP). And its extinction ratio is larger. For 50 MHz pulse injection signal, the PS characteristics of 1550nm VCSEL output in DPPI mode are affected by the switching time difference 螖 t of two injection pulses, and each bias current corresponds to an optimum 螖 t value. And the value decreases gradually with the increase of bias current. For a fixed bias current, the best 螖 t value and the switching time of polarization output of frequency detuning X (Y) mainly depend on the polarization pulse injection intensity Einjx (Einjy), and the switching time of X (Y) polarization output becomes shorter with the increase of EinjX (Einjy). The negative frequency detuning can reduce the switching time of X and Y polarization output. Therefore, by changing the injection intensity and frequency detuning, the PS switching time of both polarization outputs can be effectively regulated. In addition, we also give the system response of 1550 nm VCSEL when injected by two 2.5 GB / s NRZ signals.
【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
【分類號(hào)】：TN248

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