A 6 × 30 Gb/s Tunable Transmitter PIC With Low RF Crosstalk From an Open-Access InP Foundry

We demonstrate a six-channel tunable optical transmitter photonic integrated circuit fabricated in an open-access indium phosphide foundry process. The device monolithically integrates 20-nm tunable lasers and 30-Gb/s Mach-Zehnder modulators, without the use of Bragg gratings or quantum wells for phase modulation, to form a compact 3.9 × 4.5 mm
²
high-density 6 × 30 Gb/s parallel transmitter. It exhibits a capacity density metric of 10 Gb/s/mm
²
, comparable to the state-of-the-art results from the literature and low <; -50 dB inter-channel radio-frequency crosstalk. With an attractive price point of 7 USD/Gb/s, the device can be a low-cost solution for data center interconnects or residential access networks.