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9 March 2020 Polarization-stable 940nm VCSELs for sparing (Conference Presentation)
Petter Westbergh, Sonia Quadery, Haiquan Yang, Hao Chen, Frank Flens, Richard Chan, Tsurugi Sudo, Dan Kuchta
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Proceedings Volume 11300, Vertical-Cavity Surface-Emitting Lasers XXIV; 113000D (2020) https://doi.org/10.1117/12.2546951
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
We demonstrate multimode 940 nm flip chip VCSELs with >20dB polarization suppression and small signal modulation bandwidth > 25 GHz (3dB) in 2x4 arrays for 50 Gbit/s/channel NRZ transmission. The VCSELs have surface gratings for polarization suppression. The high bandwidth operation is achieved in part by using a relatively small oxide aperture. The arrays are comprised of pairs of VCSELs with orthogonal polarizations, which enable cold sparing; if a primary (P-polarized) VCSEL fails, a system turns on a secondary (S-polarized) VCSEL. The light beam is routed through optics to the same 50 μm core fiber for both polarizations thus keeping the link integrity intact.
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Petter Westbergh, Sonia Quadery, Haiquan Yang, Hao Chen, Frank Flens, Richard Chan, Tsurugi Sudo, and Dan Kuchta "Polarization-stable 940nm VCSELs for sparing (Conference Presentation)", Proc. SPIE 11300, Vertical-Cavity Surface-Emitting Lasers XXIV, 113000D (9 March 2020); https://doi.org/10.1117/12.2546951
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KEYWORDS
Vertical cavity surface emitting lasers
Polarization
Modulation
Oxides
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