Fibre optic interconnecting devices and passive components - basic test and measurement procedures - part 3 - 40 : examinations and measurements - extinction ratio of a polarization maintaining fibre pigtailed connector 纤维光学互连器件和无源器件基本试验和测量程序第3 - 40部分：检查和测量-带保偏光纤尾纤连接器的消光比
In this dissertation , the boa device with high extinction - ration , low drive - voltage , high - speed switch and insensitive to wide range of light wavelength , has been developed on double - heterostructure gaas / gaaias 本研究就是在gaas gaalas双异质结材料上设计高消光比，低驱动电压，高速度，较宽范围工作波长不敏感的高性能boa光开关。
Then a theoretic study about this buffer and analysis of its characteristics such as gain , ase noise and snr are carried out , and the influence of optical switch ’ s extinction ratio on the buffer is also represented 接下来详细全面的对这种新颖缓存器进行了理论研究,并分析了它的增益、 ase噪声和snr等特性,以及光开关消光比对缓存器的影响。
Based on the macneille design and the basic principle optical thin film , we improve the extinction ratio of pbs through changing the structure and interference that can erase the p polarizing refractive both on the front and back side 从棱镜的设计原理和薄膜光学的理论基础为出发点，通过改变棱镜的结构形式提高其消光比：利用干涉方法消除了前后通光面p光的反射。
In order to realize low half - wave voltage , high polarzation extinction ratio , low pigtailing polarization crosstalk , low insert loss , precise tapped power ( ratio ) and good splitting beam ratio , the optimum design was performed 为了实现低的半波电压、高的偏振消光比、低尾纤串音、低插入损耗、精确的抽头功率比和良好的分束比,我们对器件结构进行了优化设计。
We collect distributing of near - field of optical switch output - port . using gaussian curve fit , we measure the extinction ratio of " bar channel " is 8db , and the extinction ratio of " cross channel " is more than 18db 利用红外摄像机采集的光开关输出的近场分布，采用对场光场能量高斯拟合的近似方法，测得该关注入光开关的直通端的消光比可以达到8db ，而反射端的消光比则至少可以达到18db以上。
On the basis of rate equations of frsl , power characteristics and extinction ratio of the converted light are discussed . the relation between relaxation oscillation , small - signal modulation response , modulation bandwidth and the length of fiber ring cavity is analyzed also 根据frsl满足的单模速率方程，讨论了采用frsl进行波长转换时转换光的功率特性和消光比，以及frsl的弛豫振荡特性、小信号调制响应、调制带宽与光纤环形腔长度的关系。
The relationships between extinction - ration , half - wave voltage and electrode structure have been analyzed with transfer matrix theory and effective index method . the following conclusions have been made : 1 ) . the electrode width can be optimized to get the lowest half - wave voltage of boa - type optical switch 我们设计的集总电极型boa光开关理论3db调制带宽大于2 . 5ghz ，半波电压为5v ，消光比大于40db ，对tm模的理论衰减大于45db ，而对te模的损耗小于0 . 15db 。
The traveling - wave electrode boa - type device has been analyzed with spectrum domain method . the results show : the boa device of n + - doped substrates can not obtain the velocity - match between the lightwave and microwave due to the slow - wave and skin effect of n + - doped substrates ; we can choose the thickness of n ^ - doped layer on the s . i I在对芯片的各部分进行理论分析和设计的同时，我们研究了器件的制作工艺，并提出了一种有效提高gaas gaaias双异质结boa光开关性能的新型工艺，预期该技术将有利于提高boa型光开关阵列的成品率和提高消光比。
The optical switch with double - heterostructure gaas / gaalas has low switching - voltage and light loss . and the boa - type optical switch utilizes maximum modal dispersion ( a p ) , does not require a specific fabrication length or length range to operate , has simple structure , and can exhibit very high extinction - ration from its two output ports ; so it is suitable for a 2 x 2 unit of optical switch array 而boa型结构(或称为零间隙定向耦合型)光开关利用了最大的模色散( ) ，不需要严格控制特殊的制造长度或制造范围，结构简单，从其两个输出端可以得到很高的消光比，是一种很好的2 2波导型光开关单元，同时也是光开关阵列的一种较好的选择。
