Impact of Damping on High-Speed Large Signal VCSEL Dynamics

Haglund, Emanuel,1988Chalmers tekniska högskola,Chalmers University of Technology (författare)

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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
high-speed modulation
relaxation oscillation
semiconductor lasers
large signal modulation
vertical cavity surface-emitting laser (VCSEL)
photon lifetime
Damping

Westbergh, Petter,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)petwes (författare)
Gustavsson, Johan,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)johangus (författare)
Larsson, Anders,1957Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)andersla (författare)
Chalmers tekniska högskola (creator_code:org_t)

Av författaren/redakt...: Haglund, Emanuel ...; Westbergh, Pette ...; Gustavsson, Joha ...; Larsson, Anders, ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Telekommunikatio ...

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