SU-8 optical waveguides and devices are developed for the 2 μm wavelength range for the potential applications in the future high-capacity optical communications operating at 2 μm. The mode properties of the SU-8 optical waveguides are analyzed numerically. The SU-8 optical waveguides and devices are fabricated with the spin-coating process. The measured propagation losses for the fabricated SU-8 optical waveguides is about 10dB/cm. The demonstrated microring resonator (MRR) has a Q-value of 5000.
As the link capacity increases dramatically, it is also becoming more and more important to develop smart photonic networks-on-chip so that the bandwidth/channels can be utilized optimally and flexibly. One of the keys for realizing smart (reconfigurable) photonic networks is reconfigurable photonic integrated devices and circuits. As silicon has a large thermo-optic (TO) coefficient as well as a high heat conductivity, it is promising to realize efficient thermallyreconfigurable silicon photonic integrated devices and circuits with simple fabrication processes. This paper gives a review of our recent work on reconfigurable photonic integrated devices and circuits on silicon, including: (1) tunable microring-resonator (MRR)-based optical filters; (2) ultra-broadband optical switches; (3) monolithically-integrated reconfigurable optical add-drop multiplexers (ROADMs) for wavelength-division-multiplexing (WDM), mode-divisionmultiplexing (MDM), as well as hybrid WDM-MDM systems.