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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
PubMed
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.

Keywords:
C-band communicationlow dark currentoptoelectronicsphotodiodesquantum dashes

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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.