Low-Dark Current 1.55 Micrometer InAs Quantum Dash Waveguide Photodiodes

Y. Wan, C. Shang, J. Huang, Z. Xie, A. Jain, D. Inoue, B. Chen, J. Norman, A. C. Gossard, and J. E. Bowers
Publication Image
1.55 micrometer quantum dash waveguide photodiodes
Publication Date
Publication Type
Journal/Conference Name
ACS Nano

We demonstrate the first C-band InAs quantum dash (Qdash) waveguide photodiodes (PDs) with a record-low dark current of 5 pA, a responsivity of 0.26 A/W at 1.55 μm, and open eye diagrams up to 10 Gb/s. The dark current density of 3.3×10-7 A/cm2 is around five orders of magnitude lower than the state-of-art Ge PDs, and two orders of magnitude lower than commercial InGaAs PDs. The Qdash-based PDs leverage the same epitaxial layers and processing steps as Qdash lasers and can thus be integrated with laser sources for power monitors or amplifiers for pre-amplified receivers, manifesting themselves as a promising alternative to their InGaAs and Ge counterparts in low-power optical communication links.

Research Areas