Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures
Danfeng Zhu,
Dingnan Deng,
Junbo Chen,
Shaobin Qiu,
Jing Li,
Han Ye
Affiliations
Danfeng Zhu
School of Physics and Electrical Engineering, Meizhou Intelligent Photoelectric Detection Application Engineering Technology Research Center, Jiaying University, Meizhou 514015, China
Dingnan Deng
School of Physics and Electrical Engineering, Meizhou Intelligent Photoelectric Detection Application Engineering Technology Research Center, Jiaying University, Meizhou 514015, China
Junbo Chen
School of Physics and Electrical Engineering, Meizhou Intelligent Photoelectric Detection Application Engineering Technology Research Center, Jiaying University, Meizhou 514015, China
Shaobin Qiu
School of Physics and Electrical Engineering, Meizhou Intelligent Photoelectric Detection Application Engineering Technology Research Center, Jiaying University, Meizhou 514015, China
Jing Li
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Han Ye
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Three ultracompact integrated photonic devices are proposed, assisted by etched structures. A mode-order converter (MOC) is achieved with a footprint of 0.85 × 1.4 μm2, which exhibits high performances with insertion loss (IL) below 0.34 dB and mode purity (MP) above 90% within 100 nm waveband. Moreover, a mode blocking filter (MBF) is proposed based on a subwavelength grating with a footprint of 0.8 × 4.12 μm2, which allows the propagation of TM0 mode but blocks the TM1 mode with a remarkably high extinction ratio of 31.6 dB at the wavelength of 1550 nm. Finally, a compact reciprocal optical diode (ROD) is presented by cascading the abovementioned MOC and MBF with a footprint of 0.85 × 5.9 μm2. This ROD enables one-way transmissions for both TM0 mode and TM1 mode with contrast ratios of 19.74 dB and 32.04 dB, respectively. The design methodology paves a new way for mode manipulation in integrated multimode photonic circuits.
