{"ddc":["530"],"file":[{"date_created":"2023-01-03T09:36:34Z","file_name":"2023-01 Nikbakht - Optics Letter - Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and small footprint.pdf","content_type":"application/pdf","relation":"main_file","file_id":"35129","embargo":"2024-01-03","embargo_to":"open_access","file_size":3731864,"creator":"fossie","date_updated":"2023-01-03T09:36:34Z","access_level":"local"}],"doi":"10.1364/ol.476537","_id":"35128","title":"Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint","author":[{"first_name":"Hamed","full_name":"Nikbakht, Hamed","last_name":"Nikbakht"},{"first_name":"Mohammad Talebi","full_name":"Khoshmehr, Mohammad Talebi","last_name":"Khoshmehr"},{"first_name":"Bob","last_name":"van Someren","full_name":"van Someren, Bob"},{"first_name":"Dieter","full_name":"Teichrib, Dieter","last_name":"Teichrib"},{"first_name":"Manfred","id":"48077","last_name":"Hammer","orcid":"0000-0002-6331-9348","full_name":"Hammer, Manfred"},{"first_name":"Jens","id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens"},{"full_name":"Akca, B. Imran","last_name":"Akca","first_name":"B. Imran"}],"type":"journal_article","date_created":"2023-01-03T09:32:47Z","abstract":[{"lang":"eng","text":"Here we demonstrate a new, to the best of our knowledge, type of 3-dB coupler that has an ultra-broadband operational range from 1300 to 1600 nm with low fabrication sensitivity. The overall device size is 800 µm including in/out S-bend waveguides. The coupler is an asymmetric non-uniform directional coupler that consists of two tapered waveguides. One of the coupler arms is shifted by 100 µm in the propagation direction, which results in a more wavelength-insensitive 3-dB response compared to a standard (not shifted) coupler. Moreover, compared to a long adiabatic coupler, we achieved a similar wavelength response at a 16-times-smaller device length. The couplers were fabricated using the silicon nitride platform of Lionix International. We also experimentally demonstrated an optical switch that is made by using two of these couplers in a Mach–Zehnder interferometer configuration. According to experimental results, this optical switch exhibits –10 dB of extinction ratio over the 1500–1600 nm wavelength range. Our results indicate that this new type of coupler holds great promise for various applications, including optical imaging, telecommunications, and reconfigurable photonic processors where compact, fabrication-tolerant, and wavelength-insensitive couplers are essential."}],"user_id":"158","page":"207","year":"2022","has_accepted_license":"1","language":[{"iso":"eng"}],"volume":48,"keyword":["tet_topic_waveguide"],"issue":"2","department":[{"_id":"61"},{"_id":"230"}],"publication":"Optics Letters","date_updated":"2023-01-03T10:37:34Z","intvolume":"        48","publisher":"Optica Publishing Group","publication_status":"published","publication_identifier":{"issn":["0146-9592","1539-4794"]},"citation":{"short":"H. Nikbakht, M.T. Khoshmehr, B. van Someren, D. Teichrib, M. Hammer, J. Förstner, B.I. Akca, Optics Letters 48 (2022) 207.","ama":"Nikbakht H, Khoshmehr MT, van Someren B, et al. Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint. <i>Optics Letters</i>. 2022;48(2):207. doi:<a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>","apa":"Nikbakht, H., Khoshmehr, M. T., van Someren, B., Teichrib, D., Hammer, M., Förstner, J., &#38; Akca, B. I. (2022). Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint. <i>Optics Letters</i>, <i>48</i>(2), 207. <a href=\"https://doi.org/10.1364/ol.476537\">https://doi.org/10.1364/ol.476537</a>","mla":"Nikbakht, Hamed, et al. “Asymmetric, Non-Uniform 3-DB Directional Coupler with 300-Nm Bandwidth and a Small Footprint.” <i>Optics Letters</i>, vol. 48, no. 2, Optica Publishing Group, 2022, p. 207, doi:<a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>.","chicago":"Nikbakht, Hamed, Mohammad Talebi Khoshmehr, Bob van Someren, Dieter Teichrib, Manfred Hammer, Jens Förstner, and B. Imran Akca. “Asymmetric, Non-Uniform 3-DB Directional Coupler with 300-Nm Bandwidth and a Small Footprint.” <i>Optics Letters</i> 48, no. 2 (2022): 207. <a href=\"https://doi.org/10.1364/ol.476537\">https://doi.org/10.1364/ol.476537</a>.","ieee":"H. Nikbakht <i>et al.</i>, “Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint,” <i>Optics Letters</i>, vol. 48, no. 2, p. 207, 2022, doi: <a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>.","bibtex":"@article{Nikbakht_Khoshmehr_van Someren_Teichrib_Hammer_Förstner_Akca_2022, title={Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint}, volume={48}, DOI={<a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>}, number={2}, journal={Optics Letters}, publisher={Optica Publishing Group}, author={Nikbakht, Hamed and Khoshmehr, Mohammad Talebi and van Someren, Bob and Teichrib, Dieter and Hammer, Manfred and Förstner, Jens and Akca, B. Imran}, year={2022}, pages={207} }"},"file_date_updated":"2023-01-03T09:36:34Z","status":"public"}