光電反饋下1550nm VCSELs的非線性動力學(xué)特性研究
發(fā)布時間：2018-09-02 08:36
【摘要】：半導(dǎo)體激光器在光反饋、光注入、光電反饋等外部擾動下可產(chǎn)生單周期、注入鎖定、準(zhǔn)周期、混沌等一系列豐富的非線性動力學(xué)行為,這些非線性動力學(xué)行為在光生微波、混沌保密通信、神經(jīng)光子學(xué)、真隨機(jī)數(shù)獲取等領(lǐng)域有著巨大的潛在應(yīng)用價值。與常規(guī)邊發(fā)射半導(dǎo)體激光器(EELs)相比,垂直腔表面發(fā)射激光器(VCSELs)因具有更低的閾值電流、體積小、遠(yuǎn)場發(fā)散角較小、對光纖耦合損耗低、易實(shí)現(xiàn)動態(tài)單縱模輸出和易于大規(guī)模集成等優(yōu)點(diǎn)而備受關(guān)注。特別地,位于光纖通信窗口的長波長(1310 nm-1550 nm)VCSELs因易于與現(xiàn)有光纖系統(tǒng)兼容而成為了近年來的研究熱點(diǎn)。目前基于VCSELs非線性動力學(xué)特性的研究主要集中在光反饋和光注入兩種方式,對光電反饋下VCSELs非線性動力學(xué)特性的研究大多基于理論分析,而相關(guān)的實(shí)驗報道還較少。因此,實(shí)驗研究光電反饋下1550 nm VCSELs的非線性動力學(xué)特性具有一定的應(yīng)用價值。本文實(shí)驗研究了光電正反饋和光電負(fù)反饋兩種擾動下1550 nm VCSELs的動力學(xué)特性,并分析了這些動力學(xué)態(tài)的演化路徑。研究結(jié)果表明:當(dāng)光電正反饋和光電負(fù)反饋強(qiáng)度固定不變時,在不同的偏置電流下1550 nm VCSEL可表現(xiàn)出規(guī)則脈沖態(tài)、準(zhǔn)周期態(tài)、混沌脈沖態(tài)等非線性動力學(xué)態(tài)。固定偏置電流,調(diào)節(jié)光電正反饋或光電負(fù)反饋強(qiáng)度,1550 nm VCSEL也可呈現(xiàn)規(guī)則脈沖態(tài)、準(zhǔn)周期態(tài)、混沌脈沖態(tài)等豐富的非線性動力學(xué)狀態(tài)。在光電正反饋下,對于較小偏置電流和弱反饋強(qiáng)度,激光器主要工作在穩(wěn)態(tài);隨著偏置電流的增加,1550 nm VCSEL輸出的動力學(xué)態(tài)在較大的一個偏置電流范圍內(nèi)隨光電正反饋強(qiáng)度的增加以規(guī)則脈沖態(tài)-準(zhǔn)周期態(tài)-規(guī)則脈沖態(tài)的方式循環(huán)演化;在光電負(fù)反饋下,對于較小偏置電流和弱光電負(fù)反饋,激光器仍工作在穩(wěn)態(tài),隨著偏置電流增加,VCSEL輸出的動力學(xué)態(tài)通常隨負(fù)反饋強(qiáng)度的增加以規(guī)則脈沖態(tài)-準(zhǔn)周期態(tài)-規(guī)則脈沖態(tài)的方式循環(huán)演化到混沌脈沖態(tài),但當(dāng)偏置電流增加到一定值后,1550 nm VCSEL輸出的動力學(xué)態(tài)隨負(fù)反饋強(qiáng)度的增加主要以規(guī)則脈沖態(tài)-準(zhǔn)周期態(tài)-混沌脈沖態(tài)的方式循環(huán)演化。此外,我們給出了激光器在這兩種光電反饋下的非線性動力學(xué)狀態(tài)在偏置電流和反饋強(qiáng)度構(gòu)成的參數(shù)空間的分布。
[Abstract]:Semiconductor lasers can produce a series of nonlinear dynamic behaviors such as single period, injection locking, quasi-period, chaos and so on under external disturbances such as optical feedback, optical injection, optoelectronic feedback and so on. Chaotic secure communication, neurophotonics, true random number acquisition and other fields have great potential applications. Compared with conventional side emitting semiconductor laser (EELs), the vertical cavity surface emitting laser (VCSELs) has lower threshold current, smaller volume, smaller far-field divergence angle and lower coupling loss to fiber. The advantages of easy to realize dynamic single longitudinal mode output and easy to integrate in large scale have attracted much attention. In particular, the long wavelength (1310 nm-1550 nm) VCSELs) located in the optical fiber communication window has become a hot topic in recent years because of its compatibility with existing optical fiber systems. At present, the research based on the nonlinear dynamic characteristics of VCSELs is mainly focused on optical feedback and optical injection. The research on nonlinear dynamic characteristics of VCSELs based on optoelectronic feedback is mostly based on theoretical analysis, but there are few related experimental reports. Therefore, the experimental study of the nonlinear dynamic characteristics of 1550 nm VCSELs with optoelectronic feedback has certain application value. In this paper, the dynamic characteristics of 1550 nm VCSELs under both optoelectronic positive feedback and optoelectronic negative feedback are studied experimentally, and the evolution paths of these dynamic states are analyzed. The results show that when the intensity of the positive feedback and the negative feedback is fixed, the nonlinear dynamic states such as regular pulse state, quasi-periodic state and chaotic pulse state can be observed at different bias currents for 1550 nm VCSEL. Fixed bias current, adjusting the intensity of optoelectronic positive feedback or optoelectronic negative feedback can also present regular pulse state, quasi periodic state, chaotic pulse state and other rich nonlinear dynamic states. For the smaller bias current and the weak feedback intensity, the laser mainly works in the steady state under the optoelectronic positive feedback. With the increase of bias current, the dynamic state of 1550 nm VCSEL output evolves in a larger range of bias current with the increase of positive photoelectric feedback intensity in a regular pulse state, quasi periodic state and regular pulse state, and under the negative optoelectronic feedback, the dynamic state evolves in a regular pulse state, a quasi periodic state and a regular pulse state in a large range of bias current. For small bias current and weak optoelectronic negative feedback, the laser still works in steady state. With the increase of bias current, the dynamic state of VCSEL output usually evolves from regular pulse state, quasi periodic state to regular pulse state to chaotic pulse state with the increase of negative feedback intensity. However, when the bias current increases to a certain value, the dynamic state of 1550 nm VCSEL output evolves with the increase of negative feedback intensity, mainly in the form of regular pulse state, quasi-periodic state and chaotic pulse state. In addition, we give the distribution of the nonlinear dynamic state of the laser in the parameter space of the bias current and the feedback intensity under these two kinds of optoelectronic feedback.
【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】：2017
【分類號】：TN248;O322
本文編號：2218827
[Abstract]:Semiconductor lasers can produce a series of nonlinear dynamic behaviors such as single period, injection locking, quasi-period, chaos and so on under external disturbances such as optical feedback, optical injection, optoelectronic feedback and so on. Chaotic secure communication, neurophotonics, true random number acquisition and other fields have great potential applications. Compared with conventional side emitting semiconductor laser (EELs), the vertical cavity surface emitting laser (VCSELs) has lower threshold current, smaller volume, smaller far-field divergence angle and lower coupling loss to fiber. The advantages of easy to realize dynamic single longitudinal mode output and easy to integrate in large scale have attracted much attention. In particular, the long wavelength (1310 nm-1550 nm) VCSELs) located in the optical fiber communication window has become a hot topic in recent years because of its compatibility with existing optical fiber systems. At present, the research based on the nonlinear dynamic characteristics of VCSELs is mainly focused on optical feedback and optical injection. The research on nonlinear dynamic characteristics of VCSELs based on optoelectronic feedback is mostly based on theoretical analysis, but there are few related experimental reports. Therefore, the experimental study of the nonlinear dynamic characteristics of 1550 nm VCSELs with optoelectronic feedback has certain application value. In this paper, the dynamic characteristics of 1550 nm VCSELs under both optoelectronic positive feedback and optoelectronic negative feedback are studied experimentally, and the evolution paths of these dynamic states are analyzed. The results show that when the intensity of the positive feedback and the negative feedback is fixed, the nonlinear dynamic states such as regular pulse state, quasi-periodic state and chaotic pulse state can be observed at different bias currents for 1550 nm VCSEL. Fixed bias current, adjusting the intensity of optoelectronic positive feedback or optoelectronic negative feedback can also present regular pulse state, quasi periodic state, chaotic pulse state and other rich nonlinear dynamic states. For the smaller bias current and the weak feedback intensity, the laser mainly works in the steady state under the optoelectronic positive feedback. With the increase of bias current, the dynamic state of 1550 nm VCSEL output evolves in a larger range of bias current with the increase of positive photoelectric feedback intensity in a regular pulse state, quasi periodic state and regular pulse state, and under the negative optoelectronic feedback, the dynamic state evolves in a regular pulse state, a quasi periodic state and a regular pulse state in a large range of bias current. For small bias current and weak optoelectronic negative feedback, the laser still works in steady state. With the increase of bias current, the dynamic state of VCSEL output usually evolves from regular pulse state, quasi periodic state to regular pulse state to chaotic pulse state with the increase of negative feedback intensity. However, when the bias current increases to a certain value, the dynamic state of 1550 nm VCSEL output evolves with the increase of negative feedback intensity, mainly in the form of regular pulse state, quasi-periodic state and chaotic pulse state. In addition, we give the distribution of the nonlinear dynamic state of the laser in the parameter space of the bias current and the feedback intensity under these two kinds of optoelectronic feedback.
【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】：2017
【分類號】：TN248;O322
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