Figure 10
From: Programmable wavelength filter with double ring loaded MZI
Fabricated double-ring-loaded MZI filter circuit. The upper figure shows the mask layout of the fabricated chip. The basic design is a MZI loaded with two sets of double rings, where the input and output coupler for the MZI are a double-stage balanced MZI15. This design also incorporates a placeholder for later semiconductor optical amplifier (SOA) post-processing using transfer printing26. Without SOA, the placeholder introduces additional insertion losses. Monitor photodiodes are connected to the inside of the ring resonators and in the arms of the MZIs. The lower image is a microscopic image of the chip, the chip is wire-bonded to a PCB board for electronic control.
