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Proceedings Paper

Polarization insensitive and low-loss coupling mode-size converter from super luminescent diode to silica-based planar lightwave circuit
Author(s): Xuan She; Bei Li; Kan Chen; Ke Li; Xiaowu Shu; Cheng Liu
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Paper Abstract

We present a design of a laterally tapered optical waveguide mode-size converter from super luminescent diode (SLD) to silica-based planar lightwave circuit (PLC). The mode-size converter is based on silica-based PLC. By using three dimensional semi-vectorial beam propagation methods, laterally tapered waveguides with different boundaries are simulated and compared with each other, where the factors of polarization-dependent loss and coupling loss are mainly focused on. The results show that the most influential factor for polarization-dependent loss is the ratio of the divergence angle of SLD in the horizontal direction and the vertical direction. The refractive index difference Δ between core layer and cladding layer, core width of endface and taper length influence coupling loss mostly, while the effect of all side boundaries is within 0.05 dB. We also investigate the SLD misalignment tolerance and wavelength bandwidth’s impact on coupling loss. Furthermore, we examine the performance of the mode-size converter based on a particular SLD which has a divergence angle of 30°×45°. By optimizing the parameters of the tapered waveguide, the coupling efficiency is increased to 62.4% and the polarization-dependent loss is reduced to 0.035 dB. Meanwhile, it eΔnables us to reduce the coupling loss variation to 0.05dB with core width of endface fabrication tolerance of ±0.5 μm and taper length tolerance of ±0.5 mm. The proposed mode-size converter has been demonstrated to be well performed, implying its application in the optical transceiver module using SLD as light source and hybrid integration of III–V semiconductor waveguiding devices and PLCs.

Paper Details

Date Published: 28 February 2017
PDF: 11 pages
Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 1025661 (28 February 2017); doi: 10.1117/12.2256294
Show Author Affiliations
Xuan She, Zhejiang Univ. (China)
Bei Li, Zhejiang Univ. (China)
Kan Chen, Zhejiang Univ. (China)
Ke Li, Zhejiang Univ. (China)
Xiaowu Shu, Zhejiang Univ. (China)
Cheng Liu, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 10256:
Second International Conference on Photonics and Optical Engineering
Chunmin Zhang; Anand Asundi, Editor(s)

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