[WE1] Optical Modules and Fiber Coupling

[WE1-4] Accurate Fiber Alignment using Silicon Photodiode on Grating Coupler for Wafer-Level Testing

〇Yoshiho Maeda, Toru Miura, Shinji Matsuo, Hiroshi Fukuda (NTT Corporation, Japan)

Keywords:Photonic integrated circuits, Fiber characterization and measurement techniques, Photodiode

A new fiber alignment method for wafer-level testing of silicon photonics devices achieves a high signal-to-noise (S/N) ratio. Using the response from a Si photodiode fabricated directly on a grating coupler and operating it in the avalanche region, we achieved over 4-dB improvement in the S/N ratio for fiber alignment.