Abstract
Meeting the increasing demand for capacity in wireless networks requires the harnessing of higher regions in the radiofrequency spectrum, reducing cell size, as well as more compact, agile and power-efficient base stations that are capable of smoothly interfacing the radio and fibre segments. Fully functional microwave photonic chips are promising candidates in attempts to meet these goals. In recent years, many integrated microwave photonic chips have been reported in different technologies. To the best of our knowledge, none has monolithically integrated all the main active and passive optoelectronic components. Here, we report the first demonstration of a tunable microwave photonics filter that is monolithically integrated into an indium phosphide chip. The reconfigurable radiofrequency photonic filter includes all the necessary elements (for example, lasers, modulators and photodetectors), and its response can be tuned by means of control electric currents. This is an important step in demonstrating the feasibility of integrated and programmable microwave photonic processors.
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Acknowledgements
The authors acknowledge financial support from the Spanish Centro para el Desarrollo Tecnológico Industrial (CDTI) through the NEOTEC start-up programme, the European Commission through the 7th Research Framework Programme project, Photonic Advanced Research and Development for Integrated Generic Manufacturing (FP7-PARADIGM), the Generalitat Valenciana through the Programa para grupos de Investigación de Excelencia (PROMETEO) project code 2013/012, the Spanish Ministerio de Economía y Comercio (MINECO) via project TEC2013-42332-P, PIF4ESP, and the Universitat Politécnica de Valencia (UPVOV) through projects 10-3E-492 and 08-3E-008 funded by the Fondos Europeos de Desarrollo Regional (FEDER). J.S. Fandiño acknowledges financial support from Formación de Profesorado Universitario (FPU) grant AP2010-1595.
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J.C, J.S.F and P.M conceived the filter design. J.S.F. and D.D. designed the chip. J.S.F. conceived the experiments and performed the measurements. J.S.F., P.M. and J.C. analysed the data and wrote the paper. P.M and J.C managed the project.
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Fandiño, J., Muñoz, P., Doménech, D. et al. A monolithic integrated photonic microwave filter. Nature Photon 11, 124–129 (2017). https://doi.org/10.1038/nphoton.2016.233
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DOI: https://doi.org/10.1038/nphoton.2016.233
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