Abstract
An ultracompact and highly flexible mode-order conversion scheme by exploiting reciprocal mode transitions is proposed and investigated in detail, where an inverse/asymmetric input taper and an asymmetric output taper are introduced at both ends of a subwavelength gratings (SWGs) waveguide, respectively, to form two mode transition configurations. For given input TEpmode, it is gradually transited into a single-mode-like (SML) component from the input taper to the SWGs waveguide and then this SML component is inversely transited into the desired TEqmode from the SWGs waveguide to the output taper, where p< qand effective indices of given and desired modes are matched. Thus, such a transited SML component can serve as an exchanging light between given TEpand target TEqmodes with matched effective indices so that arbitrary and flexible mode conversions can be realized by only choosing appropriate dimension parameters for specific mode transitions, significantly simplifying the device design. Results show that TEp-to-TEq(p= 0, 1, 2, 3&q= 1, 2, 3, 4) converters can achieve a high conversion efficiency of 83.2% in the worst-case at 1.55 μm, where total device lengths are ranged from 4.1 to 14.9 μm. Moreover, conversion efficiency of > 80% and modal crosstalk of < −10 dB can be achieved over a broad bandwidth of 80 nm in the worst-case. Additionally, fabrication tolerances are analyzed and light propagation profiles are also demonstrated.
PDF Article
More Like This
Compact and broadband silicon mode-order converter using bricked subwavelength gratings
Mengjia Lu, Chunyu Deng, Yu Sun, Dongyu Wang, Lei Huang, Pengcheng Liu, Dongdong Lin, Wei Cheng, Guohua Hu, Tong Lin, Binfeng Yun, and Yiping Cui
Opt. Express 30(14) 24655-24666 (2022)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription