Tunable Bragg Grating Filters Using UV-Written Au-MOFs/SU-8 Waveguide Based on All-Optical Modulating Technique

Abstract

In this work, all-optical Bragg grating filters using Au-MOFs/SU-8 waveguides are achieved based on photothermal effect. This featured loading and network structure of Au-MOFs/SU-8 could effectively suppress the clustering to Au nanoparticles. The device is achieved by directly UV-written technique. 532 nm wavelength and C-band are defined as pumping and signal light, respectively. For the all-optical chip without polishing, the insertion loss is -12.5 dB, the extinction ratio is larger than 25 dB, the tunable sensitivity is 25.25 nm/mW, the rising and falling time are measured as 455 and $857~\mu $ s, respectively. The all-optical waveguide Bragg grating filters proposed are potential for realizing large-scale all-optical on-chip signal processing application.