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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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CWDM source based on AlGaInAs/InP monolithically integrated DFB laser array.

Lianping Hou1, Mohsin Haji, Jehan Akbar

  • 1School of Engineering, University of Glasgow, Glasgow, G12 8LT, United Kingdom. lianping.hou@glasgow.ac.uk

Optics Letters
|November 4, 2011
PubMed
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Researchers developed an integrated photonic device combining four lasers, optical combiner, amplifier, and modulator. This innovation enhances coupling efficiency for optical communications.

Area of Science:

  • Photonics
  • Semiconductor devices
  • Optical communications

Background:

  • Monolithic integration of photonic components is crucial for advanced optical systems.
  • Distributed feedback (DFB) lasers and semiconductor optical amplifiers (SOAs) are key components in Wavelength Division Multiplexing (WDM) systems.

Purpose of the Study:

  • To demonstrate a monolithic integration of four AlGaInAs/InP DFB lasers with an optical combiner, SOA, and electro-absorption modulator.
  • To achieve enhanced coupling efficiency with single-mode fiber.

Main Methods:

  • Utilized sidewall grating and quantum well intermixing for fabrication.
  • Designed an epitaxial structure to optimize the far-field pattern.
  • Integrated a 4x1 multimode-interference optical combiner and a curved semiconductor optical amplifier.

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Published on: November 22, 2019

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Main Results:

  • Successfully integrated four DFB lasers operating in the 1530-1566 nm range with 12 nm channel spacing.
  • Achieved a small far-field pattern of 21.2°×25.1°.
  • Demonstrated twice the coupling efficiency with angled-end single-mode fiber compared to conventional designs.

Conclusions:

  • The demonstrated monolithic integration offers a simpler fabrication route for complex photonic devices.
  • The improved coupling efficiency is significant for enhancing performance in optical communication systems.