Abstract

Manipulating the coupling coefficient at subwavelength scales provides an additional degree of freedom in designing integrated Bragg gratings. We demonstrate asymmetric contradirectional couplers (contra-DCs) using sidewall-corrugated subwavelength grating (SWG) waveguides for broadband add–drop Bragg filters. We show that a SWG can effectively increase the overlap of coupled modes and thus the photonic band gap. The measured spectra show good agreement with the prediction of photonic band structure simulations. A record bandwidth of 4.07 THz (33.4 nm) has been achieved experimentally. A four-port Bragg resonating filter made of a phase-shifted Bragg grating SWG contra-DC is also demonstrated for narrow-band (near 100 GHz) filtering. All these devices are achieved on the 220-nm silicon-on-insulator platform with a compact length of less than 150 μm. These large stopband filters may find important applications such as band splitting, reconfigurable channel band switching, bandwidth-tunable filtering, and dispersion engineering.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Sub-wavelength grating components for integrated optics applications on SOI chips

Valentina Donzella, Ahmed Sherwali, Jonas Flueckiger, Sahba Talebi Fard, Samantha M. Grist, and Lukas Chrostowski
Opt. Express 22(17) 21037-21050 (2014)

Silicon photonic contradirectional couplers using subwavelength grating waveguides

Behnam Naghdi and Lawrence R. Chen
Opt. Express 24(20) 23429-23438 (2016)

Add–drop filter based on apodized surface-corrugated gratings

Dorothea Wiesmann, Roland Germann, Gian-Luca Bona, Christian David, Daniel Erni, and Heinz Jäckel
J. Opt. Soc. Am. B 20(3) 417-423 (2003)

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 (5)

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

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