Abstract
We report a design of 55 cm long spiral delay line at 850 nm wavelength. Propagation characteristics were simulated and analysed with a fully vectorial EigenMode Expansion (EME) method. Bending losses were calculated and analysed for the optimization of minimum bending radius for reported structure. We have also simulated and analysed excess loss for a bandwidth of 200 nm at 850 nm operating wavelength. An excess loss of less than 0.2 dB is reported for the structure over the entire bandwidth range. Reported structure is easy to fabricate, ultra-low loss and also broadband over 200 nm with a footprint of only 6 × 6 sq. mm. So, this design will improvise the reference arm section and will enhance the depth scanning of integrated optics based optical coherence tomography systems.
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Acknowledgements
This work is supported by DIT University, Dehradun, India. The authors would like to thank the Vice-chancellor and management of DIT University, India, for encouragement and support during the present research work. The authors are also thankful to Dr. Sulabha Ranade, Director General, SAMEER and Sh. S.S. Prasadh, Programme Director, SAMEER for their encouragement and support for this work. One of the authors Dr. Kamal Kishor, would also like to gratefully acknowledge the financial support provided by the TIFAC-Centre of Relevance and Excellence in Fiber Optics and Optical communication at Delhi Technological University (Formerly Delhi College of Engineering, Delhi) through the Mission Reach program of Technology, Vision-2020, Government of India.
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Sharma, B., Kishor, K., Pal, A. et al. Design and Simulation of Ultra low loss Spiral Delay line for Integrated Optical Coherence Tomography. Opt Quant Electron 53, 391 (2021). https://doi.org/10.1007/s11082-021-03047-y
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DOI: https://doi.org/10.1007/s11082-021-03047-y