Abstract

We propose a taper-underlaid spot-size converter (TU-SSC) with an offset which consists of two vertically stacked taper layers. The designed TU-SSC reduces coupling loss of a high index-contrast waveguide with <TEX>$1.5%{\Delta}$</TEX> to a single mode fiber from 1.5 dB to 0.27 dB. We also considered the effects of mask misalignment in the fabrication process of TU-SSC, and optimized the design of TU-SSC so that the additional loss of TU-SSC for the mask misalignment of <TEX>$3{\mu}m$</TEX> in the photo-lithography process was as low as 0.13 dB.

© 2007 Optical Society of Korea

Design optimization and tolerance analysis of a spot-size converter for the taper-assisted vertical integration platform in InP

Valery Tolstikhin, Shayan Saeidi, and Ksenia Dolgaleva
Appl. Opt. 57(13) 3586-3591 (2018)

Vertically tapered waveguide spot size converters fabricated via a linewidth controlled grey tone lithography for InP-based photonic integrated circuits

O. Salehzadeh, M. Vachon, N. Sabourin, S. Janz, and A. J. SpringThorpe
Opt. Express 28(16) 23523-23533 (2020)

Mosquito method based polymer tapered waveguide as a spot size converter

Yui Kobayashi, Yoji Sakaguchi, Kazuki Yasuhara, and Takaaki Ishigure
Opt. Express 29(6) 9513-9531 (2021)

Analysis of the polarization rotation effect in the inversely tapered spot size converter

Lianxi Jia, Haifeng Zhou, Tsung-Yang Liow, Junfeng Song, Ying Huang, Xiaoguang Tu, Xianshu Luo, Chao Li, Qing Fang, Mingbin Yu, and Guoqiang Lo
Opt. Express 23(21) 27776-27785 (2015)

Spot-size converter with a SiO₂ spacer layer between tapered Si and SiON waveguides for fiber-to-chip coupling

Yuriko Maegami, Ryohei Takei, Emiko Omoda, Takeru Amano, Makoto Okano, Masahiko Mori, Toshihiro Kamei, and Youichi Sakakibara
Opt. Express 23(16) 21287-21295 (2015)