Embedded Grating }^}}^ Traveling-Wave Photodetectors

This paper describes the design of embedded-grating n + -i-n + traveling-wave photodetectors (TWPDs). In the ideal case of perfect electrically matched photodetectors, the TWPD bandwidth is determined by the velocity mismatch between the group velocity of the optical beam and the phase velocity of t...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2009-05, Vol.57 (5), p.1244-1249
Main Authors: Torrese, G., Wei, C., Frank, M.J., Huynen, I., Vander Vorst, A., Megret, P.
Format: Article
Language:English
Subjects:
Bandwidth
Design optimization
Electrodes
grating
Gratings
Optical attenuators
Optical beams
Optical propagation
Optical waveguides
Photodetectors
photodiode
RF signals
semiconductor device
traveling-wave photodetector (TWPD)
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Summary:This paper describes the design of embedded-grating n + -i-n + traveling-wave photodetectors (TWPDs). In the ideal case of perfect electrically matched photodetectors, the TWPD bandwidth is determined by the velocity mismatch between the group velocity of the optical beam and the phase velocity of the electrical photogenerated signal, as well as by the attenuation of the RF signal propagating along the electrodes. Since the group velocity is determined once the layer's thickness is selected, which, in turn, is optimized for coupling the light into the photodetector, only an accurate electrode design allows for the velocity matching. In this paper, we propose a new structure that utilizes a grating integrated within a single-mode waveguide in order to tailor the optical group velocity and match it to the phase velocity of the photogenerated signal.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2009.2017364