
Proceedings Paper
Electro-optically modulated coupled-cavity VCSELs: electrical design optimization for high-speed operationFormat | Member Price | Non-Member Price |
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Paper Abstract
Vertical-Cavity Surface-Emitting Lasers, due to their properties, are one of the best choices for optical communication
purposes. Although direct modulated VCSELs have reached error free operation at speed of 40 Gbit/s,
however, their cut-off frequency is limited by the relaxation oscillation phenomenon and is not likely to be further
increased. Recently, it has been suggested that properly designed Coupled Cavity VCSEL with one cavity
used as a reverse-biased Electro-Optic Modulator, can be only limited by the 3 dB electrical bandwidth cut-off
frequency. Therefore, it is important to develop a high-speed electrical design for such VCSELs. In this paper we
first present an analysis of an electrical equivalent circuit of EOM CC-VCSEL with lumped electrodes. We base
our design on record high-speed structures reported in the literature. We optimize our structure with respect
to modulator cavity length, number of top and middle distributed Bragg reflectors, doping levels of layers, radii
of both mesas and non-ion implantation region in the DBR as well as the contact pad area. We show that
the most influencing parameters are the mesa capacitance, series resistance and polyimide capacitance. The
3 dB bandwidth is enhanced by reducing the contact pad area and modulator cavity diameter, together with
increasing the modulator cavity length. Faster operation is provided by pnp structure, instead of npn - one. A
realistic structure design that is theoretically able to work with a 90 GHz modulation speed is suggested. Finally
we also discuss the possibility of using a design concept of a EOM CC-VCSEL based on traveling wave electrode
configuration.
Paper Details
Date Published: 10 May 2012
PDF: 10 pages
Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84320C (10 May 2012); doi: 10.1117/12.922387
Published in SPIE Proceedings Vol. 8432:
Semiconductor Lasers and Laser Dynamics V
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)
PDF: 10 pages
Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84320C (10 May 2012); doi: 10.1117/12.922387
Show Author Affiliations
Published in SPIE Proceedings Vol. 8432:
Semiconductor Lasers and Laser Dynamics V
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)
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