High order coupled microring resonator filters for on-chip optical interconnects with steep edge response

ABSTRACT

In this paper, high-order microring resonator filters coupled serially up to the 7^th order are proposed for on-chip optical interconnects. This work mainly focuses on achieving a flat-top, higher out-of-band rejection ratio, and enhanced group delay value than previously demonstrated microring filters. Further, the effect of varying inter-resonator coupling coefficients on the filtering operation of wavelength 1552 nm is investigated, using the continued fraction method, and optimum conditions for coupling coefficients between ring-ring waveguides are realized to obtain steep edge response. The proposed design exhibits a minimum group delay of 7.457 ps at a coupling value of 0.04.

KEYWORDS:

• Microring resonator
• serially cascaded
• group delay
• FDTD
• silicon photonics

Acknowledgements

The authors are greatly thankful to the optical research lab provided by the Thapar Institute of Engineering and Technology.

Disclosure statement

Not Applicable.

Author contribution

All authors have equal contribution to this manuscript.

Data availability statement

Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.

Additional information

Funding

The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

Notes on contributors

Geetika Mehandiratta

Geetika Mehandiratta received her B.Tech. degree in Electronics and Communication from DAV Institute of Engineering and Technology, Jalandhar, Punjab, India, in the year 2014. She received her M.E. degree in Electronics and Communication from Thapar Institute of Engineering and Technology, Patiala, Punjab, India. She is currently pursuing Ph.D. from Thapar Institute of Engineering and Technology, Patiala, Punjab. Her research interests are photonic interconnects, optical signal processing, and photonic crystals.

R.S Kaler

R. S. Kaler received his B.Tech. degree with distinction from Guru Nanak Dev University, Amritsar, India and his M.E. degree from Punjab University, Chandigarh, India. He received his Ph.D. degree from Punjab Technical University, Jalandhar. in 2003. Currently, he is working as a Senior Professor, ECED and Dean of Faculty Affairs at Thapar Institute of Engineering and Technology, Patiala, Punjab. He has over 286 Journal Publications and 119 conference papers. He has guided 25 Ph.D. and 59 M.E. Thesis.