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Impact of Damping on High-Speed Large Signal VCSEL Dynamics

Emanuel P. Haglund (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Petter Westbergh (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Johan S. Gustavsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Anders Larsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
Journal of Lightwave Technology (0733-8724). Vol. 33 (2015), 4, p. 795 - 801.
[Artikel, refereegranskad vetenskaplig]

An investigation of the optimal relaxation oscillation damping for high-speed 850-nm vertical-cavity surface-emitting laser (VCSEL) under large signal operation is presented, using devices with K-factors ranging from 0.1 to 0.4 ns. Time-domain measurements of turn-on transients are used to quantify damping dependent rise times, overshoots, and signal amplitudes. Optical eye diagrams together with timing jitter and bit error rate measurements reveal a tradeoff between the rise time and the duration of the relaxation oscillations. To produce a high-quality eye at a specific data rate, a proper amount of damping is needed to simultaneously obtain sufficiently high bandwidth and low timing jitter. We found that for error-free transmission, a VCSEL with a 0.3 ns K-factor achieved the best receiver sensitivity at 10 and 25 Gb/s, whereas a less damped VCSEL with a 0.2 ns K-factor achieved the best sensitivity at 40 Gb/s.

Nyckelord: Damping, high-speed modulation, large signal modulation, photon lifetime, relaxation oscillation, semiconductor lasers, vertical cavity surface-emitting laser (VCSEL)

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Denna post skapades 2015-03-16. Senast ändrad 2016-04-11.
CPL Pubid: 213821


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