Abstract

Herein, a compact and efficient inverted tapered ridge-to-slot waveguide coupler design based on the silicon-on-insulator platform is presented. The proposed device consists of three segments such as ridge waveguide, inverted taper segment, and slot waveguide. The coupling segment resembles a V shape, which provides good mode-matching between the ridge and slot waveguide. Two significant aspects of the proposed coupler design are discussed. In the first part of the paper, the coupler design optimized at 1.55 µm is suggested for optical interconnect. The propagation loss and coupling efficiency of 1.69 dB/µm and 91% are obtained for the 100 nm long tapered segment introduced between the ridge waveguide and slot waveguide, respectively. This propagation loss of the device includes the loss suffered by the ridge waveguide, tapered segment, and slot waveguide. Our proposed device design can be used in integrated optical platforms, where the efficient coupling of light to slot waveguides is required. Whereas, in the second part, the coupler design is optimized at the mid-infrared of 3.392 µm for an evanescent field absorption methane gas sensor. Slot waveguide offers excessive light–matter interaction due to its strong mode confinement in the low index material. The evanescent field ratio of ${\sim}{0.73}$ is obtained for the optimized waveguide geometry. As a result, 3 dB decay in the transmitted power can be obtained at 60% of gas concentration present in the ambient medium.

© 2020 Optical Society of America

Full Article  |  PDF Article
More Like This
Efficient fiber coupler for vertical silicon slot waveguides

Haishan Sun, Antao Chen, Attila Szep, and Larry R. Dalton
Opt. Express 17(25) 22571-22577 (2009)

Low-loss silicon slot waveguides and couplers fabricated with optical lithography and atomic layer deposition

A. Säynätjoki, L. Karvonen, T. Alasaarela, X. Tu, T. Y. Liow, M. Hiltunen, A. Tervonen, G. Q. Lo, and S. Honkanen
Opt. Express 19(27) 26275-26282 (2011)

Compact cross-slot waveguide polarization beam splitter using a sandwich-type coupler

Shengbao Wu, Zhicheng Zhao, Ting Feng, and X. Steve Yao
Appl. Opt. 59(5) 1447-1453 (2020)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

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 OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription