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Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications.

Nobuhide Yokota1, Hiroshi Yasaka1

  • 1Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan.

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|June 2, 2021
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Summary

Spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) generate frequency-shifted local oscillators for coherent optical communications. This novel application enables high-fidelity homodyne detection of optical data signals.

Keywords:
coherent optical communicationinjection lockinglocal oscillatorspin polarizationvertical-cavity surface-emitting laser

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Area of Science:

  • Optoelectronics
  • Optical Communications
  • Semiconductor Lasers

Background:

  • Spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) are crucial for advanced optical communication systems.
  • Injection locking is a key technique for stabilizing and modulating laser outputs in coherent systems.

Purpose of the Study:

  • To numerically investigate the use of spin-VCSELs as local oscillators (LOs) in coherent optical communications.
  • To explore the generation and characteristics of frequency-shifted, phase-correlated sidebands from modulated spin-VCSELs.
  • To demonstrate the feasibility of using these sidebands for homodyne detection.

Main Methods:

  • Numerical investigation of spin-VCSELs under injection locking.
  • Spin polarization modulation to generate orthogonally polarized, frequency-shifted sidebands.
  • Analysis of sideband strength and frequency dependence on detuning and injection ratio.
  • Proof-of-concept demonstration using 25-Gbaud 16-ary quadrature amplitude modulation signals.

Main Results:

  • Frequency-shifted and phase-correlated optical sidebands with orthogonal polarization are generated via spin polarization modulation.
  • One sideband is resonantly enhanced due to linear birefringence in the spin-VCSEL.
  • Spin polarization modulation sensitivity is dependent on detuning frequency and injection ratio.
  • Successful generation of 25-Gbaud 16-ary QAM signals and a pilot tone for injection locking.

Conclusions:

  • Spin-VCSELs can serve as effective frequency-shifted local oscillators for coherent optical communications.
  • The generated sidebands enable high-fidelity homodyne detection without signal degradation.
  • This research presents a novel application for spin-VCSELs, advancing coherent optical communication technologies.