  We propose a method to control the optical transparency of a Bose-Einstein
condensate with working energy levels of the Lambda-type. The reported effects
are essentially nonlinear and are considered in the framework of an exactly
solvable model describing the interaction of light with a Lambda-type medium.
We show how the complicated nonlinear interplay between fast and slow solitons
in the $\Lambda$-type medium points to a possibility to create optical gates as
well as to a possibility to store optical information.
