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ABSTRACT
Integrated photonics enables the miniaturization of bulk optical components for biosensing applications such as optical coherence tomography (OCT) and is therefore promising for future lab-on-chip solutions. Here, we report the design and simulation of a compact low loss broadband beam splitter with arbitrary coupling ratios on silicon nitride platform for OCT systems. The reported coupler uses asymmetric waveguide-based phase control section for 10:90, 20:80, 30:70, 40:60, and 50:50 splitting ratios and is broadband over 100 nm with the central wavelength of 850 nm. The couplers are realized for transverse electric, transverse magnetic, and fully vectorial modes, and maximum excess loss for all mode types is reported to be less than 0.19 dB. The design tolerance of waveguide width and thickness of the designed coupler is further calculated and is within fabrication limit.
Acknowledgements
This work is supported by DIT University, Dehradun, India. The authors would like to thank 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. Prasad, 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 Excellencein 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.
Additional information
Notes on contributors
Bhawna Sharma
Bhawna Sharma is pursuing her Ph.D. in the field of Photonics from DIT University, Dehradun. Her recent research interest is miniaturization of optical coherence tomography using integrated optics components. She has done her M. Tech in the field of digital communication from DIT University. She has done her B. Tech in the field of Electronics and Communication Engineering from Mody University, Rajasthan.
Kamal Kishor
Dr. Kamal Kishor received M.Sc. degree in physics and Ph.D. degree in “Fiber Optical communication and Metamaterials” from the University of Delhi, India. He is currently working as Assistant Professor, Applied Physics Department, Delhi Technological university (Formerly known as Delhi college of Engineering, University of Delhi), Delhi since 2011. He has also worked as visiting faculty in Department of Physics, Motilal Nehru College, University of Delhi, Bhartiya Vidyapeeth College of Engineering, Maharaja Agrasen Institute of Technology, Delhi College of Engineering etc. He is a member of the International Society of Optical Engineering (SPIE, USA), a member of the Optical Society of America (OSA, USA). He is also Secretary of SPIE-DCE Chapter and OSA-DCE Chapter at Delhi Technological University, Delhi. In 2010, he was awarded Research Excellence Award By SPIE. He is currently working in the area of Optical Fiber Communication System, Photonics Crystal Fibers, Metamaterials based antenna, Sensors etc.
Sandeep Sharma
Dr Sandeep Sharma has done B.Sc and M.Sc in Electronic Sciences. Post that he did Ph.D. in Theoretical Investigation of Transient Analysis of First Order and Second Order Loads powered by PV Generators from Department of Electronic Science, Delhi University. He has worked with various organizations like Converteam EDC Pvt. Ltd & Saora Informatics India Pvt Ltd as Manager and Project Lead. He has been a Faculty with Maharaja Agrasen College, Manav Rachna College of Engineering. Presently he is Associate Professor with Department of Electronics & Communication Engineering at DIT University. His recent research interest is in Optical Coherence Tomography and holography.
Roshan Makkar
Dr. Roshan Makkar is currently working as a senior Scientist at society for Applied Microwave Electronics Engineering & Research (SAMEER), IIT Bombay Campus, Mumbai. He has done his PhD from IIT Bombay in the field of Biomedical Engineering and his current project is Integrated Optics based Optical Coherence Tomography. He is involved in R&D of various photonic devices such as switches, power splitters, modulators, attenuators & laser diodes and has developed strong expertise in designing the mask layout for optic devices & generating the data for mask fabrication.