Title :
Switching characteristics of directional couplers with a longitudinal electrode gap
Author :
Weierholt, Audun J. ; Neegård, Steinar
Author_Institution :
SINTEF DELAB, Norwegian Inst. of Technol., Trondheim, Norway
fDate :
4/1/1992 12:00:00 AM
Abstract :
The effect of passive phase shift regions on the performance characteristics of parallel waveguide couplers is considered. In particular, a longitudinal electrode gap in addition to phase shifts in the adiabatic input and output taper regions is considered. Both types of phase shifts have a degrading impact on the accessibility of some switching states. However, an electrode gap combined with taper region phase shifts may be beneficial for certain traveling wave electrode configurations. For a certain combination of gap and electrode lengths a through state with better than 30 dB crosstalk over an extended voltage range has been identified
Keywords :
directional couplers; optical couplers; optical switches; accessibility; adiabatic input; degrading impact; directional couplers; electrode lengths; extended voltage range; longitudinal electrode gap; output taper regions; parallel waveguide couplers; passive phase shift regions; performance characteristics; switching characteristics; switching states; traveling wave electrode configurations; Degradation; Directional couplers; Electrodes; Performance analysis; Propagation constant; Refractive index; Transmission line matrix methods; Voltage; Waveguide discontinuities; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
