Optical Design and Engineering

Effects of random sidewall roughness on optical power splitter

[+] Author Affiliations
Mohammad Syuhaimi Ab-Rahman, Foze Saleh Ater

Universiti Kebangsaan Malaysia, Faculty of Engineering and Built Environment, Department of Electrical, Electronic and Systems Engineering, 43600 UKM Bangi, Selangor, Malaysia

Rahmah Mohamed

Universiti Teknologi MARA, Faculty of Applied Sciences, 40450 Shah Alam, Selangor, Malaysia

Opt. Eng. 54(5), 055103 (May 18, 2015). doi:10.1117/1.OE.54.5.055103
History: Received February 27, 2015; Accepted April 22, 2015
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Abstract.  The effect of optical waveguide sidewall roughness (SWR) on the performance of a 1×2 optical power splitter (OPS) using OptiBPM software for the first time is analyzed. A simulation model is presented to predict the relationship between the SWR and output optical power of OPS for different relatively wide ranges of waveguide width. In particular, different values of waveguide widths, i.e., from w=1 to 6μm, and an average roughness depth ρ from 0 to 0.5μm are considered. In addition, the corresponding insertion loss and uniformity are determined. The results show that output power decreases significantly as the SWR increases due to the increase of the scattering loss, especially for ρ0.3μm and narrow waveguides (i.e., w3μm) compared with relatively wider ones (i.e., w>3μm). SWR can greatly increase the scattering loss leading to significant output power loss, which leads to an increase in insertion loss and uniformity. The conclusion drawn from the presented results provide guidelines for evaluation device performance before real fabrication.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Mohammad Syuhaimi Ab-Rahman ; Foze Saleh Ater and Rahmah Mohamed
"Effects of random sidewall roughness on optical power splitter", Opt. Eng. 54(5), 055103 (May 18, 2015). ; http://dx.doi.org/10.1117/1.OE.54.5.055103


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