光纤光栅外腔半导体激光器的理论和实验分析

从耦合模理论出发,结合激光原理,研究了光纤光栅外腔半导体激光器(FBG-ECL)的理论模型．得到光纤光栅反射率的解析解。利用速率方程理论讨论FBG-ECL的高频响应特性。根据等效腔模型．讨论了耦合系数对FBG-ECL阈值特性的影响。指出存在最佳光纤光栅反射率．使得激光器不仅功率输出大,而且边模抑制比高。最后实测了不同反射率情况下激光器的激射光谱。     

光纤光栅外腔半导体激光器特性的分析

研究了光纤光栅外腔半导体激光器(FBG-ECL)的理论模型;根据等效腔模型,讨论耦合系数对FBG-ECL阈值特性的影响,指出存在最佳光纤光栅反射率,使得激光器不仅功率输出大、而且边模抑制比高;利用等效腔长的手段,分析了腔长对光子寿命的影响,并结合速率方程讨论了FBG-ECL的高频响应特性;最后实测了不同反射率情况下激光器的激射光谱。     

3-D寄生电阻电容线性元计算的并行实现

ＶＬＳＩ电路中，深亚微米工艺及多层布线技术的广泛应用使互连寄生效应成为制约电路性能的主要因素，直接边界元素法３－Ｄ寄生电阻电容提取的计算量很大，采用并行计算是快速提取的重要途径之一。     

ICP刻蚀优化及在多波长分布反馈式激光器阵列中的应用北大核心CSCD

研究了CH_4/H_2/Cl_2感应耦合等离子体刻蚀技术中的关键工艺参数对刻蚀性能的影响。通过对CH_4/H_2/Cl_2气体流量及流量比的优化,在自行设计的InP/InGaAlAs多量子阱结构的外延片上,实现了一种高速低损耗、形貌良好的Bragg光栅制作方法。基于优化后的工艺参数制作了多周期结构的λ/4相移光栅,实现了单片集成的四波长1.3μm分布反馈式激光器阵列。该激光器阵列中激光器的阈值电流典型值为11mA,外微分效率可达0.40 W/A,且实现了边摸抑制比大于46dB的稳定的单纵模激光输出。研究结果表明优化后的ICP光栅刻蚀工艺具有良好的刻蚀精度和可靠性。     

LD实现波长变换的消光比特性分析

提出了新的基于LD实现波长转换的理论模型,将互耦合系数引入到LD的速率方程中,并根据大信号反转粒子数密度与增益系数间的关系,求出了决定波长变换效果的互耦合系数,数值模拟结果表明其值小于1;利用该理论模型研究了转换后信号的消光比特性,结果表明,大的信号光功率、小的波长间隔及小的注入电流情况下有利于获得大的消光比。实验研究了不同信号光功率对波长转换消光比的影响,结果进一步表明理论分析的正确性。     

Characteristics of gain and pump-to-signal RIN transfer in a dual-pump SOPA with Raman effect

We investigate the spectra of the gain and pump-to-signal relative intensity noise (RIN) transfer in silicon optical parametric amplifier (SOPA) with Raman effect, and draw a conclusion that Raman effect makes the spectra narrower from 260 nm to 180 nm. A maximum gain also appears at 1622 nm. Moreover, the effects of the related parameters in SOPA on the gain and the pump-to-signal RIN transfer characteristics are also discussed. The high gain (16 dB) and low pump-to-signal RIN transfer (7 dB) can be obtained by using the appropriate parameters of pump and silicon waveguide.     

Ultra-violet and mid-infrared continuum generation by cross-phase modulation between red-shifted solitons and blue-shifted dispersive waves in a photonic crystal fiber

Using a photonic crystal fiber with a zero dispersion wavelength of the fundamental mode at 780 nm designed and fabricated in our lab, the ultraviolet and mid-infrared continua are generated by cross-phase modulation between red-shift solitons and blue-shift dispersive waves. The dependences of continuum on the pump power and wavelength are investigated. With the pump working at 820 nm, when the pump power increases from 300 to 500 mW, the bandwidths of ultraviolet and mid-infrared continua change from 80 to 140 nm and 100 to 200 nm, respectively. The wavelength of ultraviolet continuum is below 246 nm, and the wavelength of mid-infrared continuum exceeds 2500 nm. Moreover, the influences of pump power on wavelength and conversion efficiency of different parts of continua are also demonstrated.     

光纤光栅外腔半导体激光器的理论及实验研究

对影响光纤光栅外腔半导体激光器特性的几个重要因素(光纤光栅长度、耦合系数、内腔反射系数)进行了理论分析和数值模拟。从实验上进行了验证,实测了不同反射率情况下激光器的激射光谱,得到了带宽为0.1nm、出纤功率达417.4μW、边模抑制比高达37.9dB的激光谱线。验证的结果表明,理论分析、数值模拟、实验结果是吻合的。     

Gain characteristics of a dual-pump fiber optical parametric amplifier with Raman effect

We investigate the pump-depleted model of a dual-pump fiber optical parametric amplifier(FOPA) with Raman effect.As bandwidth increases,the gain profile of the distorted FOPA would be impacted seriously.Under the widebands,especially when the pump separation is large,zero dispersion wavelength(ZDW) fluctuation is another factor which can not be neglected.Numerical simulations with these comprehensive factors are mainly analyzed to obtain their influence on gain characteristics.Saturated gain spectrum is also discussed in detail.     

半导体激光器实现波长转换的理论和实验分析

作为自动交换光网络中的核心器件,全光波长转换器在网络中发挥着重要作用。建立了半导体激光器实现波长转换的理论模型,利用速率方程,数值求解了半导体激光器进行波长转换的特性;自行搭建了一套利用光纤光栅外腔半导体激光器进行全光波长转换的实验平台,并对实验结果进行了研究。发现试验结果和理论分析结果是相当吻合的。分析表明,降低光子寿命,优化外腔结构将是该器件在未来智能光网中实用的关键。