On‐Chip Integrated Waveguide Amplifiers on Erbium‐Doped Thin‐Film Lithium Niobate on Insulator

Abstract

On‐chip light amplification with integrated optical waveguide fabricated on erbium‐doped thin‐film lithium niobate on insulator (TFLNOI) is demonstrated using the photolithography‐assisted chemomechanical etching (PLACE) technique. A maximum internal net gain of 18 dB in the small‐signal‐gain regime is measured at the peak emission wavelength of 1530 nm for a waveguide length of 3.6 cm, indicating a differential gain per unit length of 5 dB cm−1. This work paves the way to the monolithic integration of diverse active and passive photonic components on the TFLNOI platform.

Efficient Second Harmonic Generation in a Reverse‐Polarization Dual‐Layer Crystalline Thin Film Nanophotonic Waveguide

“…In addition, the novel chemomechanical polishing could also be applied to produce low-loss ridge waveguides on dual-layer LNOI. [46,47] Grating couplers and tapered waveguide couplers may also be utilized to boost the in-coupling light power and hence the power conversion efficiency. Another option is to use microring resonators on the platform of dual-layer LNOI instead of the straight nanophotonic ridge waveguide due to the fact that the resonance-enhanced nonlinearity heralds the on chip parameter conversion devices towards single-photon level.…”

Electro-optically tunable microdisk laser on Er3+-doped lithium niobate thin film

“…Furthermore, rare-earth ions such as erbium (Er 3 ) and Yb 3 can be conveniently doped into the LNOI to realize an active material platform [5,6] . The on-chip waveguide amplifier and microlaser based on the Er 3 -doped LNOI have stimulated growing interest in recent years, owing to the excellent optical properties of the host crystal material together with the gain performance provided by the Er 3 ions [7][8][9][10][11][12][13][14] . Recent advances in LNOI and its micro-to nano-fabrication technologies permit the hybrid integration of LNOI circuits, where the on-chip microresonator modulator or microlaser can be controlled by the passive circuitry.…”

On-Chip Integrated Yb3+-Doped Waveguide Amplifiers on Thin Film Lithium Niobate

“…In the last two decades, the rapid developments of the wafer-scale, high-quality, thin film lithium niobate on insulator (TFLNOI) and micro-and nano-fabrication techniques have realized on-chip integrated TFLNOI photonic devices with unprecedented performance [21,22]. The on-chip microlasers and amplifiers based on the Er 3+ -doped TFLNOI were demonstrated recently, showing great promise for high-performance scalable light sources based on integrated photonics [23][24][25][26][27][28][29][30]. The on-chip Yb 3+ -doped microlasers based on microresonator have also been demonstrated on the TFLNOI recently [31,32].…”