Analytical beam propagation model of micro-lensed fibers for wavelength selective switch. (January 2019)

• Record Type: Journal Article
• Authors: Gao, Yunshu; Tan, Zhongwei; Tian, Kai; Chen, Genxiang
• Is Part Of: Optics & laser technology. Volume 109(2019)
• Page Start: 504
• Page End: 509
• Publication Date: 2019-01
• Subjects: Fiber coupling micro-lens array -- Single mode fiber coupling -- Wavelength selective switch; 00-01 -- 99-00; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2018.08.032
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Scalar diffraction theory is used to analyze the beam propagation in WSS. A method for measuring the coupling efficiency of fiber coupling micro-lens. The experimental coupling efficiency can reach up to 70%. The theoretical calculations agree well with experimental results. Abstract: Micro-lensed fibers require some features such as low coupling loss and wide tolerance to function in wavelength selective switch (WSS). In this paper, Fourier optics and scalar diffraction theory are used to analyze the major beam propagation and transformation by switching different focus length micro-lens in WSS. A hemispheric micro-lens array is then etched with designed optimum focal length. In experiment, a method is proposed for measuring the insertion loss (IL) and coupling efficiency of a fiber coupling micro-lens in WSS. The theoretical calculations of the spot size at any distance from micro-lens agree well with experimental results. The experimental coupling efficiency can reach up to 70 % .