钛扩散铌酸锂光波导定向耦合器的特性

Characteristics of Ti-diffused lithium niobate optical directional couplers.

作者信息

Alferness R C, Schmidt R V, Turner E H

出版信息

Appl Opt. 1979 Dec 1;18(23):4012-6. doi: 10.1364/AO.18.004012.

DOI:10.1364/AO.18.004012

PMID:20216745

Abstract

The dependence of the coupling strength of titanium-diffused lithium niobate directional couplers upon fabrication parameters and guided wavelength has been investigated. Measurements of the coupling strength as a function of interguide separation have been made at He-Ne, GaAs, and Nd:YAG wavelengths. To good approximation, the coupling strength depends exponentially upon guide separation. Rather strong dependence upon the metal thickness diffused and the guided wavelength were observed. Good comparison was obtained with theoretical results calculated using an effective index method. Transfer lengths as short as 200 microm have been obtained. Fabrication parameters for which the coupling strength for the TE and TM modes are equal were determined.

摘要

研究了钛扩散铌酸锂定向耦合器的耦合强度与制造参数及导波波长的关系。在氦氖、砷化镓和钕钇铝石榴石波长下，测量了耦合强度随波导间距的变化。在良好近似下，耦合强度随波导间距呈指数变化。观察到耦合强度对扩散金属厚度和导波波长有相当强的依赖性。与使用有效折射率法计算的理论结果进行了很好的比较。已获得短至200微米的传输长度。确定了TE和TM模式耦合强度相等时的制造参数。