Performance Analysis on a Dual External Cavity Tunable Laser ECTL Source
Performance Analysis on a Dual External Cavity Tunable Laser ECTL Source作者机构：Department of Electrical Engineering Minia University Minia Egypt Department of Electronics Communications and Computer Engineering Helwan University Cairo Egypt
出 版 物：《Journal of Electromagnetic Analysis and Applications》 (电磁分析与应用期刊（英文）)
年 卷 期：2015年第7卷第4期
页 面：134-139页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：External Cavity Laser Tunable Laser MEMS Optical Diffraction
摘 要：This paper presents the diffraction effects on the performance of a dual external cavity tunable laser source, whose external cavities are constructed by micro electro mechanical systems (MEMS). One of the main problems in these structures is the optical diffraction as the emitting surface of the laser diode is usually quite limited in the transverse directions. The emitted beam diffracts rapidly in the air and only a small amount of light is coupled back to the source that usually limits the tuning range of the source. Device characteristics such as tuning range, wavelength shift and sensitivity are evaluated. New expression is used and multiple reflections inside external cavities are considered. The simulation results have shown that single external cavity has limited tuning range. It is shown that multiple reflections have significant effect in our model. To get a better engineering for the dual ECTL dimensions, diffraction effects must be taken into account.
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