Patents

"Compact dual polarization couplers for multi-core optical fibers," Paulo Clovis Dainese, Lucas Heitzmann Gabrielli, Sukru Ekin Kocabas, Julian L Pita Ruiz, Lucas Gavião Rocha, Jun Yang U.S. Patent US12498522B2, granted Dec. 16, 2025. url
"Photonic interface design methods and devices thereof," J. L. Pita Ruiz, M. Ménard, B. Ung, S. LaRochelle, S Gougeon. U.S. Provisional Patent 63/814,883, filed May 30, 2025.

Journal Publications

Pita Ruiz, J.L., Dalvand, N. & Ménard, M., "Integrated silicon nitride devices via inverse design," Nature Communications, 16, 9307 (2025). url pdf
J. L. Pita, J. Diego Marconi and M. Ménard, "Inverse-Designed Tellurite Devices for Polarization Control," IEEE Photonics Technology Letters, vol. 38, no. 6, pp. 422-425, 15 March, 2026. url pdf
J. L. P. Ruiz, N. Dalvand and M. Ménard,, "Inverse-Designed 90-Degree Silicon Nitride Bends for the C Band," Journal of Lightwave Technology,, vol. 43, no. 12, pp. 5804-5810, 15 June15, 2025. url pdf
Navid Heidari, Julian L. Pita Ruiz, Seyedfakhreddin Nabavi, Michaël Ménard, and Frederic Nabki, "Reconfigurable electrostatically actuated 1 × 5 rotary MOEMS switch," Optics Express, 33, 10726-10740 (2025). url pdf
Julian Pita, Paulo Dainese, and Michaël Ménard, "Inverse design fiber-to-chip couplers for the O- and C-bands," Optics Letters, 50, 1973-1976 (2025). url pdf
Julian Pita, Frederic Nabki, and Michaël Ménard, "Inverse-designed silicon nitride reflectors," Optics Letters,49, 786-789 (2024). url pdf
Aldaya, I.; Pires de Souza, B.D.; Penchel, R.A.; Pita, J.L.; dos Santos, M.P.; de Oliveira, J.A.; Abbade, M.L.F., "Effect of Beam-Steering Angle, Operation Wavelength and Mean Inter-Element Distance on the Side-Lobe Levels of Integrated Optical Phased Arrays under Beam-Steering Operation," Photonics, vol. 10, no. 12, p. 1300 (2023). url pdf
Julian L. Pita Ruiz, Frederic Nabki, and Michaël Ménard, "Silicon nitride TM-pass polarizer using inverse design," Optics Express, 31, 37892-37899 (2023). url pdf
Rabih, Almur AS, Suraj Sharma, Julian Pita, Michaël Ménard, and Frederic Nabki. "Two-axis MEMS positioner for waveguide alignment in silicon nitride photonic integrated circuits." Optics Express 31, no. 19 (2023): 30797-30814. url pdf
Romulo Aparecido de Paula Jr., Ivan Aldaya, Tiago Sutili, Rafael C. Figueiredo, Julian L. Pita, and Yesica R. R. Bustamante. "Design of a silicon Mach-Zehnder modulator via deep learning and evolutionary algorithms." Scientific Reports 13, 14662 (2023). url pdf
Costa, Camila, Lucio Borges, Rafael A. Penchel, Marcelo LF Abbade, Elias Giacoumidis, Jinlong Wei, Jose A. de Oliveira, Pita Ruiz JL, and Ivan Aldaya. "Self-phase modulation and inter-polarization cross-phase modulation mitigation in single-channel DP-16QAM coherent PON employing 4D clustering." Optical Fiber Technology 75 (2023): 103186. url pdf
Pita Ruiz JL, Rocha LG, Yang J, Kocabaş SE, Li MJ, Aldaya I, Ménard M, Dainese P, and Gabrielli LH. "Ultracompact silicon-on-insulator couplers for multicore fibers." ACS Photonics 10, no. 4 (2022): 953-958. url pdf
Ruiz, Julian L. Pita, Lucas G. Rocha, Jun Yang, Şükrü Ekin Kocabaş, Ming-Jun Li, Ivan Aldaya, Paulo Dainese, and Lucas H. Gabrielli. "Efficient integrated tri-modal coupler for few-mode fibers." Optics Express 30, no. 2 (2022): 2539-2546. url pdf
J. Ruiz, L. Rocha, J. Yang, Ş. Kocabaş, M. Li, I. Aldaya, P. Dainese, and L. Gabrielli, "Compact dual-polarization silicon integrated couplers for multicore fibers," Optics Letters 46, (2021): 3649-3652. url pdf
Jarschel, Paulo F., Erick Lamilla, Yovanny AV Espinel, Ivan Aldaya, Julian L. Pita, Andres Gil-Molina, Gustavo S. Wiederhecker, and Paulo Dainese. "Intermodal Brillouin scattering in solid-core photonic crystal fibers." APL Photonics 6, no. 3 (2021): 036108. url pdf
Ruiz, Julián L. Pita, Ivan Aldaya, Paulo Dainese, and Lucas H. Gabrielli. "Design of Compact Arbitrary-Ratio Multimode Power Splitters Based on Topological Derivative." IEEE Photonics Technology Letters 32, no. 18 (2020): 1187-1190. url pdf
Aldaya, Ivan, Elias Giacoumidis, Geraldo de Oliveira, Jinlong Wei, Julián Leonel Pita, Jorge Diego Marconi, Eric Alberto Mello Fagotto, Liam Barry, and Marcelo Luis Francisco Abbade. "Histogram based clustering for nonlinear compensation in long reach coherent passive optical networks." Applied Sciences 10, no. 1 (2020): 152. url pdf
Ruiz, Julián L. Pita, Alan AS Amad, Lucas H. Gabrielli, and Antonio André Novotny. "Optimization of the electromagnetic scattering problem based on the topological derivative method." Optics Express 27, no. 23 (2019): 33586-33605. url pdf
Lamilla, Erick, Maicon S. Faria, Ivan Aldaya, Paulo F. Jarschel, Julián L. Pita, and Paulo Dainese. "Characterization of surface-states in a hollow core photonic crystal fiber." Optics Express 26, no. 25 (2018): 32554-32564. url pdf
Gil-Molina, Andres, Ivan Aldaya, Julián L. Pita, Lucas H. Gabrielli, Hugo L. Fragnito, and Paulo Dainese. "Optical free-carrier generation in silicon nano-waveguides at 1550 nm." Applied Physics Letters 112, no. 25 (2018): 251104. url pdf
Pita, Julián L., Ivan Aldaya, Paulo Dainese, Hugo E. Hernandez-Figueroa, and Lucas H. Gabrielli. "Design of a compact CMOS-compatible photonic antenna by topological optimization." Optics Express 26, no. 3 (2018): 2435-2442. url pdf
Pita, Julián L., Ivan Aldaya, Octávio JS Santana, Paulo Dainese, and Lucas H. Gabrielli. "Side-lobe level reduction in bio-inspired optical phased-array antennas." Optics Express 25, no. 24 (2017): 30105-30114. url pdf
Aldaya, Ivan, Andres Gil-Molina, Julian L. Pita, Lucas H. Gabrielli, Hugo L. Fragnito, and Paulo Dainese. "Nonlinear carrier dynamics in silicon nano-waveguides." Optica 4, no. 10 (2017): 1219-1227. url pdf

Conference Publications

Narges Dalvand, Julian L. Pita Ruiz, and Michaël Ménard. "Inverse-Designed Silicon Nitride Arbitrary Mode Splitters for Interferometric Optical Sensors," In Advanced Photonics Congress (IPR, Networks, NOMA, SOLITH, SPPCom), Technical Digest Series, paper IM2B.3. Optica Publishing Group, 2025. url pdf
Julian L. Pita Ruiz, Dipankar Sengupta, Christine Tremblay, Ming-Jun Li, Paulo Dainese, and Michaël Ménard. "7×100 Gb/s Multicore Fiber Link Enabled by an Inverse-Designed Dual-Polarization Coupler," In Optical Fiber Communication Conference (OFC) 2025, Technical Digest Series, paper M4J.8. Optica Publishing Group, 2025. url pdf
Julian L. Pita Ruiz, Almur A. S. Rabih, Seyedfakhreddin Nabavi, Frederic Nabki, and Michaël Ménard. "1 x 5 MEMS Mode Selective Switch with an Inverse-Designed Silicon Nitride MDM," In 2024 Conference on Lasers and Electro-Optics (CLEO), pp. 1-2. IEEE, 2024. url pdf
Ivan Aldaya, Lucio Borges, Camila Costa, Julian L Pita, Rafael A Penchel, José Augusto de Oliveira, Grethell Peréz-Sánchez, "Impairment mitigation in dual-polarization single-span optical digital coherent systems using support vector classifiers," In XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT), 2023. url pdf
Pita, Julian L., Lucas H. Gabrielli, Jun Yang, Ming-Jun Li, Paulo Dainese, and Michaël Ménard. "Vertical Silicon-on-Insulator Coupler for High Density Optical Interconnects." In CLEO: Science and Innovations, pp. JW2A-3. Optica Publishing Group, 2023. url pdf
Dainese, Paulo C., Jun Yang, Ming-Jun Li, Julian L. Pita, and Lucas H. Gabrielli. "Inverse-designed on-chip couplers for spatial division multiplexing." In Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII, vol. 12429, p. 1242906. SPIE, 2023. video
de Andrade, H.A., Pita, J.L., de Farias, G.B. and Gabrielli, L.H. "Demonstration of Integrated Coupler Based on Compact Antennas for OAM Fiber Modes." In CLEO: Applications and Technology, pp. 1-2. IEEE, 2022. url pdf
Pita, J.L., Alvarenga, R., Rocha, L., Yang, J., Kocabaş, Ş.E., Li, M.J., Aldaya, I., Dainese, P. and Gabrielli, L.H. "Silicon-on-Insulator Couplers for SDM Transmission." In CLEO: Applications and Technology, pp. JW3B-178. Optica Publishing Group, 2022. url pdf
C. Coia, S. Sharma, N. Kohli, A. A. S. Rabih, S. Nabavi, J. Pita Ruiz, J. Brière, F. Nabki, M. Ménard. "Innovative MOEMS architectures for optical switching." In 2022 Conference on Lasers and Electro-Optics (CLEO). video
Rocha, Lucas G., Julian L. Pita Ruiz, and Lucas H. Gabrielli. "Compact grating coupler array for multicore fiber fabricated with DUV lithography." In 2021 SBFoton International Optics and Photonics Conference (SBFoton IOPC), pp. 1-4. IEEE, 2021. url pdf
de Andrade, Hening A., Julián L. Pita, Giovanni B. de Farias, and Lucas H. Gabrielli. "Integrated Couplers for OAM Fiber Modes using Compact Antennas and Circular Grating." In Frontiers in Optics, pp. FM2D-2. Optical Society of America, 2020. url
Pellegrini, Paloma ES, Paulo F. Jarschel, Julian L. Pita, Roberto R. Panepucci, and Lucas H. Gabrielli. "Focusing Images through Large-Core Multimode Fibers and a Multimode Fiber Endoscope." In Optical Devices and Materials for Solar Energy and Solid-state Lighting, pp. JTu4C-7. Optical Society of America, 2020. url pdf
Ferreira, Antonio, Bruna Dias, Jose Augusto de Oliveira, Andre Alves, Jorge D. Marconi, Gabriel Campuzano, Julian Pita, and Ivan Aldaya. "Optimization of OFDM parameters for 10-Gbps long reach coherent PONs." In 2019 21st International Conference on Transparent Optical Networks (ICTON), pp. 1-4. IEEE, 2019. url pdf
Dainese, Paulo, Ivan Aldaya, Andrés Gil-Molina, Lucas H. Gabrielli, Hugo L. Fragnito, and Julian L. Pita. "Generation and recombination of free carriers in silicon nano-waveguides." In Optical Interconnects XIX, vol. 10924, p. 1092412. International Society for Optics and Photonics, 2019. url pdf
Lamilla, Erick, Ivan Aldaya, Maicon S. Faria, Paulo F. Jarschel, Julián L. Pita, and Paulo Dainese. "Recovery of highly-dispersive modes using a wavelength-resolved modified S2 imaging method." In Latin America Optics and Photonics Conference, pp. Th3B-3. Optical Society of America, 2018. url pdf
Gil-Molina, Andres, Ivan Aldaya, Julián L. Pita, Lucas H. Gabrielli, Hugo L. Fragnito, and Paulo Dainese. "Characterization of linear and nonlinear carrier generation in silicon nano-waveguides at 1550 nm." In CLEO: Science and Innovations, pp. JTu2A-71. Optical Society of America, 2018. url pdf
Pita, Julián L., Ivan Aldaya, Octávio JS Santana, Luís EE De Araujo, Paulo Dainese, and Lucas H. Gabrielli. "Side-lobe level reduction in two-dimensional optical phased array antennas." In CLEO: Science and Innovations, pp. JW2A-58. Optical Society of America, 2018. url pdf
Aldaya, Ivan, Andres Gil-Molina, Julián L. Pita, Lucas H. Gabrielli, Hugo L. Fragnito, and Paulo Dainese. "Probing free-carrier recombination in silicon strip nano-waveguides." In CLEO: QELS_Fundamental Science, pp. FF1E-8. Optical Society of America, 2018. url pdf
Aldaya, Ivan, Paulo Dainese, Andrés Gil-Molina, Julián L. Pita, and Hugo L. Fragnito. "Characterization of nonlinear carrier dynamics in silicon strip nanowaveguides." In 2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), pp. 1-4. IEEE, 2017. url pdf
Gabrielli, Lucas H., Luciano P. de Oliveira, Gilliard N. Malheiros-Silveira, Julián L. Pita, and Hugo E. Hernandez-Figueroa. "Sparse array of dielectric resonator antennas for ultra-wide band applications." In 2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), pp. 1-4. IEEE, 2017. url pdf
Aldaya, I., A. Gil-Molina, J. L. Pita, H. L. Fragnito, and P. Dainese. "Lifetime dependence on carrier density in silicon nanowires." In The European Conference on Lasers and Electro-Optics, p. CK_P_4. Optical Society of America, 2017. url pdf
Pita, Julián L., Paulo Dainese, Hugo E. Hernandez-Figueroa, and Lucas H. Gabrielli. "Ultra-compact broadband dielectric antenna." In CLEO: Science and Innovations, pp. SM3G-7. Optical Society of America, 2016. url pdf
Aldaya, Ivan, Rômulo de Paula, Bruna Dias, Lucas Marim, Lúcio Borges, Camila Costa, Julián Pita et al. "Fiber-induced nonlinear limitation in 400-Gbps single-channel coherent optical interconnects." url pdf
Souza, Bruna DP, Ivan Aldaya, Julián L. Pita, Marcelo LF Abbade, Paulo F. Jarschel, and Rafael A. Penchel. "Optimization of Element Positions in Linear Optical Phased Arrays for Broad Beam Steering Operation." url pdf