Spin polarization modulation of 1.55-&mu;m VCSELs for high-speed data communications

Nobuhide Yokota; Kunpei Nisaka; Kazuhiro Ikeda; Hiroshi Yasaka

doi:10.1117/12.2529785

16 September 2019 Spin polarization modulation of 1.55-μm VCSELs for high-speed data communications

Nobuhide Yokota, Kunpei Nisaka, Kazuhiro Ikeda, Hiroshi Yasaka

Proceedings Volume 11090, Spintronics XII; 1109036 (2019) https://doi.org/10.1117/12.2529785
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

High-speed vertical-cavity surface-emitting lasers (VCSELs) are essential for future data communications with high speed, low cost, and low power consumptions. For exceeding intrinsic modulation bandwidth of VCSELs limited by the relaxation oscillation frequency, manipulation of electron spin polarizations in VCSELs has been attracting attention in recent years. In this study, we theoretically and experimentally investigate modulation characteristics of 1.55-m VCSELs under the spin polarization modulation to obtaining tailored modulation characteristics suitable for high-speed data communications. Spin-flip rate equation analyses reveal that a short spin relaxation time is suitable for a flat modulation response under the spin polarization modulation, and a 100-Gb/s operation is expected in InAlGaAs quantum well (QW) VCSELs with a spin relaxation time of 10 ps, linear birefringence of 100 GHz, and dichroism of 50 GHz. A wide 3-dB bandwidth of 23 GHz determined by a frequency split between two orthogonal polarization modes (~19.4 GHz) is experimentally confirmed under optical spin polarization modulations by using a commercially-available InAlGaAs QW VCSEL whose relaxation oscillation frequency is ~3 GHz. These results support the idea that the ultrahigh- speed optical signal generation is available at the telecom wavelength of 1.55 m by applying the spin polarization modulation to VCSELs. Additionally, a modulation format conversion technique for output lights from the polarization modulation to phase modulation by using a polarizer is suggested and confirmed by the spin-flip rate equation analyses.

Citation Download Citation

Nobuhide Yokota, Kunpei Nisaka, Kazuhiro Ikeda, and Hiroshi Yasaka "Spin polarization modulation of 1.55-μm VCSELs for high-speed data communications", Proc. SPIE 11090, Spintronics XII, 1109036 (16 September 2019); https://doi.org/10.1117/12.2529785

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KEYWORDS

Modulation

Vertical cavity surface emitting lasers

Polarization

Spin polarization

Modulators

Data communications

Phase shift keying

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