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Low Dark Current 1.55 Micrometer InAs Quantum Dash Waveguide Photodiodes
Yating Wan1, Chen Shang2, Jian Huang3
1Institute for Energy Efficiency, University of California Santa Barbara, Santa Barbara, California 93106, United States.
ACS Nano
|February 22, 2020
Summary
We developed C-band Indium Arsenide quantum dash (Qdash) waveguide photodiodes (PDs) for 1.55 μm optical communication. These PDs achieve a record-low dark current and high responsivity, enabling integration with laser sources.
Area of Science:
- Optoelectronics
- Semiconductor devices
- Photonics
Background:
- Photodiodes (PDs) and optical receivers at 1.55 μm are vital for long-haul optical communication.
- Existing technologies face limitations in performance and integration.
Purpose of the Study:
- To report novel C-band Indium Arsenide quantum dash (Qdash) waveguide photodiodes (PDs).
- To demonstrate their suitability for high-speed optical communication links.
Main Methods:
- Fabrication of Qdash waveguide PDs using established epitaxial layers and processing steps.
- Characterization of PD performance, including dark current, responsivity, and data transmission rates.
Main Results:
- Achieved a record-low dark current of 5 pA.
- Demonstrated a responsivity of 0.26 A/W at 1.55 μm.
- Obtained open eye diagrams up to 10 Gb/s.
Conclusions:
- Qdash-based PDs offer a promising alternative to InGaAs and Ge counterparts.
- Their compatibility with Qdash lasers allows for integrated power monitors or preamplified receivers.
- These PDs are suitable for low-power optical communication links.
