On-chip arrayed waveguide grating fabricated on thin film lithium niobate

TL;DR

This paper presents the design and fabrication of an 8-channel on-chip TFLN AWG with low loss and crosstalk, demonstrating its potential for integrated photonic applications at 1550 nm.

Contribution

The paper introduces a novel fabrication of an 8-channel TFLN AWG using PLACE technique, achieving low loss and crosstalk in a compact on-chip device.

Findings

On-chip loss as low as 3.32 dB

Single-channel bandwidth of 1.6 nm

Crosstalk below -7.01 dB between adjacent channels

Abstract

We design an on-chip 8-channel TFLN AWG and fabricate the device using photolithography assisted chemo-mechanical etching (PLACE) technique. We experimentally measure the transmission of the fabricated TFLN AWG near the central wavelength of 1550 nm. We obtain an on-chip loss as low as 3.32 dB, a single-channel bandwidth of 1.6 nm and a total-channel bandwidth of 12.8 nm. The crosstalk between adjacent channels was measured to be below -7.01 dB within the wavelength range from 1543 nm to 1558 nm, and the crosstalk between non-adjacent channels was below -15 dB.