On-chip hybrid integration of swept frequency distributed-feedback laser with silicon photonic circuits using photonic wire bonding
Sheri Jahan Chowdhury, Kithmin Wickremasinghe, Samantha M. Grist, Hang Zou, Matthew Mitchell, Mohammed Al-Qadasi, Becky Lin, Davin Birdi, Shannon Nicole Smythe, Sudip Shekhar, Karen C. Cheung, Lukas Chrostowski
Abstract
This paper presents a novel co-packaging approach through on-chip hybrid laser integration with photonic circuits using photonic wire bonding. The process involves die-bonding a low-cost semiconductor distributed-feedback (DFB) laser into a deep trench on a silicon-on-insulator (SOI) chip and coupling it to the silicon circuitry through photonic wire bonding (PWB). After characterizing the power-current-voltage (LIV) and optical spectrum of the laser, a wavelength-current relationship utilizing its tunability through self-heating a swept-frequency laser (SFL) is developed. Photonic integrated circuit (PIC) resonators are successfully characterized using the SFL method, demonstrating signal detection with a quality factor comparable to measurements conducted with an off-chip benchtop laser.