Ultra-High Extinction Dual-Output Thin-Film Lithium Niobate Intensity Modulator

A low voltage, wide bandwidth compact electro-optic modulator is a key building block in the realization of tomorrow’s communication and networking needs. Recent advances fabrication application thin-film lithium niobate, its integration with photonic integrated circuits based silicon make it an ideal platform for such device. In this work, high-extinction dual-output folded Mach Zehnder nitride niobate material system presented. This has interaction region length 11 mm physical 7.8 mm. The device demonstrates fiber-to-fiber loss roughly 12 dB using on-chip fiber couplers DC half wave voltage (V?) less than 3.0 V, or modulation efficiency (V??L) 3.3 V?cm. shows 3 30 GHz. Notably, power extinction ratio over 45 at each output port without use cascaded directional additional control circuitry; 31 times better previously reported devices. Paired balanced photo-diode receiver, can be used various systems. Such detecting scheme compatible complex formats as differential phase shift keying quadrature keying, where dual-output, ultra-high fundamentally paramount to low-noise operation system.