Numerical investigation of direct IQ modulation of spin-VCSELs for coherent communications

Nobuhide Yokota; Kazuhiro Ikeda; Hiroshi Yasaka

doi:10.1117/12.2567380

20 August 2020 Numerical investigation of direct IQ modulation of spin-VCSELs for coherent communications

Nobuhide Yokota, Kazuhiro Ikeda, Hiroshi Yasaka

Proceedings Volume 11470, Spintronics XIII; 114702I (2020) https://doi.org/10.1117/12.2567380
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

We propose and numerically investigate a method for direct in-phase quadrature (IQ) modulation of spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) for coherent communications. In particular, an injection-locked spin-VCSEL is investigated by using spin-flip rate equations for generating quadrature amplitude modulation (QAM) signals. A polarizer 45° tilted to the polarization axis of the injected external light is used to extract the in-phase and quadrature-phase components of the output light from the injection-locked spin-VCSEL. It is confirmed that QAM signals can be generated with the proposed method successfully, and long electron spin relaxation time and small linear birefringence in the spin-VCSEL are suitable for efficiently generating clear QAM constellations with a low error vector magnitude. A detuning condition for the injection locking of the spin-VCSEL is found to be important for obtaining wide modulation bandwidth of the direct IQ modulation.

Conference Presentation

Citation Download Citation

Nobuhide Yokota, Kazuhiro Ikeda, and Hiroshi Yasaka "Numerical investigation of direct IQ modulation of spin-VCSELs for coherent communications", Proc. SPIE 11470, Spintronics XIII, 114702I (20 August 2020); https://doi.org/10.1117/12.2567380

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