We have developed a conservative logic, reversible
optoelectronic intensity modulator. The device, called an
X-modulator, works by using quantum wells in a nearly
symmetric Fabry-Perot cavity to direct an incident optical
beam to transmit through the device or to be reflected from
the device depending upon the state of the switching
element. The first experimental device simultaneously
switches reflectivity and transmission from 6% to 60% and
60% to 6% respectively. We also examine the cavity design
parameter space and the effects of incident angle on device
performance. Furthermore, experimental results from
combinations of stacked devices are discussed. Explanation
of a voltage reduction method by grading material
composition will also be provided. After discussing the
individual device performance, a discussion of simple
systems utilizing X-modulators will be given. In particular
an analysis of crossbar switches, field programmable gate
arrays, and lookup tables will be given as well as a
description of wavelength demultiplexing applications.