  We describe a new opto-electronic device with time-delayed feedback that uses
a Mach-Zehnder interferometer as passive nonlinearity and a semiconductor laser
as a current-to-optical-frequency converter. Bandlimited feedback allows tuning
of the characteristic time scales of both the periodic and high dimensional
chaotic oscillations that can be generated with the device. Our implementation
of the device produces oscillations in the frequency range of tens to hundreds
of MHz. We develop a model and use it to explore the experimentally observed
Andronov-Hopf bifurcation of the steady state and to estimate the dimension of
the chaotic attractor.
