https://scholars.lib.ntu.edu.tw/handle/123456789/633085
標題: | Ultra-Low Crosstalk and Fabrication-Tolerant Silicon-Nitride O-Band (de)Multiplexer Using Bragg Grating-Assisted Contra-Directional Coupler | 作者: | Chung, Kuo Fang Shih, Tien Tsorng JIUN-HAW LEE DING-WEI HUANG |
關鍵字: | Bragg grating structure | integrated optics | silicon photonics | wavelength division multiplexing system | 公開日期: | 1-二月-2023 | 出版社: | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | 卷: | 15 | 期: | 1 | 來源出版物: | IEEE Photonics Journal | 摘要: | A wavelength division (de)multiplexing (WDM) filter with ultra-low channel crosstalk (XT) and high tolerance was proposed for a 1 × 4 O-band coarse-WDM (CWDM) system on a silicon-on-insulator (SOI). The filter consists of four waveguide Bragg grating (WBG) structures, each one having a multi-mode waveguide and corrugations at both waveguide side walls. To relax the critical dimension, low-material-index silicon nitride (SiNx) was utilized instead of silicon. For efficient design of each SiNx multi-mode WBG (MMWBG), the core and corrugation widths were engineered over the perturbed-permittivity coupled-mode theory, leading to an ultra-high side-lobe suppression ratio >25.3 dB. The overall CWDM filter offers flat-top responses with ultra-low excess losses (ELs) < 0.6 dB, a high channel uniformity >-0.45 dB, broad 1-dB bandwidths (BWs) ∼13.45 nm, ultra-low XTs <-28 dB, and ultra-broad available bandwidths of 14.35 nm for XTs <-28 dB (ABW28-dB ∼14.35 nm). Analysis of the tolerance showed that XTs of the overall filter remained <-25 dB even for extreme cases with ±18-nm over-etching errors without compromising the ELs or BWs. Given its ultra-low XT, ultra-broad ABW, and high tolerance, the proposed MMWBG shows the great potential and high attractiveness for the O-band CWDM telecommunication systems. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/633085 | ISSN: | 1943-0655 1943-0647 |
DOI: | 10.1109/JPHOT.2022.3209169 |
顯示於: | 電機工程學系 |
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