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Impedance characteristics and parasitic speed limitations of high speed 850 nm VCSELs

Yiyu Ou (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Johan S. Gustavsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Petter Westbergh (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Åsa Haglund (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Anders Larsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Andrew Joel
IEEE Photonics Technology Letters (1041-1135). Vol. 21 (2009), p. 1840.
[Artikel, refereegranskad vetenskaplig]

Abstract—The impedance characteristics of high-speed oxideconfined 850-nm vertical-cavity surface-emitting lasers have been studied with the aim of identifying the importance of device parasitics for the modulation bandwidth. Through equivalent circuit modeling, it is confirmed that device parasitics have a major impact on the bandwidth and the importance of each individual circuit element has been investigated. According to the extrapolation of the parameters derived from S11 measurements below 20 GHz towards higher frequencies and assuming that the mesa capacitance can be reduced by adding a few extra oxide layers without significantly affecting series resistance, our model predicts that the 3-dB parasitic frequency can be increased from 22 to above 30 GHz. Accounting also for bandwidth limitations due to thermal effects, we expect an increase of the modulation bandwidth of several gigahertz which may enable direct current modulation at 40 Gb/s.

Nyckelord: Electrical parasitics, high speed, impedance, modulation bandwidth, vertical-cavity surface-emitting laser, VCSEL



Denna post skapades 2010-01-15. Senast ändrad 2016-04-11.
CPL Pubid: 107849

 

Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Fotonik

Ämnesområden

Optik
Optisk fysik
Annan fysik
Teknisk fysik

Chalmers infrastruktur

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