Abstract
An integrated, cascaded, asymmetric GaAs/AlGaAs Mach-Zehnder (MZ)
interferometer, for use in wavelength filtering and time-domain
multiplexing, has been designed, fabricated, and tested. This device
employs several new passive components, including height-tapered
Y-branches, for uniform splitting and recombining, and index-tailored
waveguide bends, for low-loss operation. The waveguide bend is designed
with a predistorted index profile for minimizing both transition loss and
radiation loss. The circuit is fabricated with a resistless, light-induced
local etching technique, which enables rapid iterative fabrication of the
device geometry to achieve the desired operating path delays. Acting as a
wavelength filter, the fabricated device has a {-}24.3 dB
minimum-to-maximum extinction ratio and a {-}10.5 dB side-lobe suppression
ratio. Acting as a pulse-rate multiplexer, the device generates a
four-pulse train with a 10-ps pulse-to-pulse separation and an amplitude
uniformity of 80% for each input pulse.
© 1998 IEEE
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