Abstract
Simultaneous temperature insensitive and large free spectral range (FSR) micro-ring resonator is reported using wide ring waveguide. The analysis has been performed using finite-difference time domain simulation. The wide waveguide facilitates the use of a small bending radius to increase the free spectral range with low bending losses. Temperature insensitivity is achieved by considering cladding region made of negative thermo-optic coefficient material, TiO2, over different guiding regions made of positive thermo-optic coefficient material, Si. We have analyzed and demonstrated that appropriate waveguide cross-section dimension provides balanced field delocalization in each material that ensures zero temperature sensitivity. The zero temperature sensitivity of the sensor is achieved while maintaining a high FSR ~45 nm. In contrast to the widely used SiO2 as the upper cladding material, for which a higher spectral shift of 73.4 pm/°C is observed, the temperature dependent wavelength shift in our proposed structure is completely eliminated. The relationship between full width at half maximum (FWHM) and temperature is also investigated, and it is shown that change of FWHM with temperature can be described by the coupling coefficient and group-index.
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Acknowledgements
The authors are thankful to Indian Institute of Technology Kanpur, India.
Funding
YKV, SK and GB are grateful for Institute Fellowship by Indian Institute of Technology Kanpur, India. The work was partially funded by Science and Engineering research Board, Government of India through project EMR/2016/007936.
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YKV: Conceptualization, performed simulations, data interpretation, writing-original draft. SK: Discussions, manuscript preparation and critical article revision for intellectual content. GB: Discussions, critical article revision for intellectual content. SMT: Supervision, and final approval of manuscript.
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Verma, Y.K., Kumari, S., Bawa, G. et al. Temperature insensitive large free spectral range micro-ring resonator. Opt Quant Electron 54, 839 (2022). https://doi.org/10.1007/s11082-022-04266-7
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DOI: https://doi.org/10.1007/s11082-022-04266-7