  We present a theoretical study of the magnetic band structure of conduction
and valence states in Quantum Well Wires in high magnetic fields. We show that
hole mixing results in a very complex behavior of valence edge states with
respect to conduction states, a fact which is likely to be important in
magneto-transport in the Quantum Hall regime. We show how the transition from
one-dimensional subbands to edge states and to Landau levels can be followed by
optical experiments by choosing the appropriate, linear or circular,
polarization of the light, yielding information on the one-dimensional
confinement.
