Efficient and Broadband Trident Spot-Size Convertor for Thin-Film Lithium Niobate Integrated Device

Article Engineering, Electrical & Electronic

A Cost-Effective Edge Coupler With High Polarization Selectivity for Thin Film Lithium Niobate Modulators

Meng Ke Wang et al.

Summary: Thin film lithium niobate on insulator (LNOI) is an emerging photonic material for compact, high-speed, and high-efficient electro-optic modulators. However, the mismatch between standard single mode fibers and LNOI single mode waveguides requires the use of edge or grating couplers. This paper proposes a novel edge coupler with a staircase structure, which achieves low coupling loss and high polarization extinction ratio.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2022)

Add to Collection

Article Engineering, Electrical & Electronic

Capacitively-Loaded Thin-Film Lithium Niobate Modulator With Ultra-Flat Frequency Response

Xuecheng Liu et al.

Summary: This letter presents a velocity-matched TFLN modulator based on low-loss capacitively-loaded traveling-wave electrodes (CL-TWEs) with an on-chip terminal resistor. The effect of termination resistance on the E-O frequency response is analyzed theoretically and confirmed experimentally. The results show that an ultra-flat E-O response can be achieved with a termination resistance slightly lower than the characteristic impedance of the CL-TWEs.

IEEE PHOTONICS TECHNOLOGY LETTERS (2022)

Add to Collection

Article Optics

High-efficient coupler for thin-film lithium niobate waveguide devices

Changran Hu et al.

Summary: A highly efficient and polarization-independent edge coupler based on LNOI is demonstrated in this paper, showing low fiber-chip coupling loss of 0.54 dB/0.59 dB per facet at 1550 nm for TE/TM light respectively. The coupler also exhibits a relatively large tolerance for optical misalignment and promising stability in high optical power and temperature variation.

OPTICS EXPRESS (2021)

Add to Collection

Article Optics

Two-dimensional grating coupler on an X-cut lithium niobate thin-film

Bin Chen et al.

Summary: A two-dimensional grating coupler is designed and demonstrated for coupling light between a standard single-mode fiber and ridge waveguides on an X-cut lithium niobate thin-film. By using different shapes of grating cells, coupling losses and polarization dependent losses are reduced.

OPTICS EXPRESS (2021)

Add to Collection

Article Optics

Low-loss edge-coupling thin-film lithium niobate modulator with an efficient phase shifter

Pan Ying et al.

Summary: A thin-film lithium-niobate-on-insulator platform has been demonstrated for optical interconnect and nonlinear optics applications, showing potential for energy-efficient large-capacity optical interconnects. The edge-coupling Mach-Zehnder modulator on this platform exhibits low fiber-chip coupling loss, high EO bandwidth, and efficient thermal-optic phase shifter, enabling single-lane 200 Gbit/s data transmission.

OPTICS LETTERS (2021)

Add to Collection

Review Optics

Integrated photonics on thin-film lithium niobate

Di Zhu et al.

Summary: Lithium niobate is a versatile material that plays a significant role in daily life, particularly in the fields of optical communications and photonics. Thin-film lithium niobate integrated photonics is currently undergoing a revolution, enabling high-performance nanophotonic components such as optical modulators and nonlinear wavelength converters.

ADVANCES IN OPTICS AND PHOTONICS (2021)

Add to Collection

Article Engineering, Electrical & Electronic