Patent ID: 6388815
Filing Date: 2002-05-14
Classification: G02B,H01Q

Abstract:
An apparatus for optically generating time delays in signals comprising:(a) an input light source, said input light source adapted to generate at least one individual light beam from at least one direction; (b) an input mirror adapted to reflect said at least one individual light beam; (c) a plurality of optical elements configured so as to define a plurality of possible light paths for each said light beam reflected by said input mirror; (d) at least one refocusing optical element adapted to restrict the divergence of a light beam diverted by said optical elements through at least one of said light paths; (e) a spatial light modulator adapted to select a path from among said light paths for each pass of a said light beam through said optical elements; (f) an output mirror adapted to reflect each said light beam emerging from said optical elements; and (g) at least one receiving device adapted to receive a said light beam reflected by said output mirror and determine the delay in the light beam; wherein at least said spatial light modulator is encountered at least twice by each said light beam from free-space before emerging from said optical elements to said output mirror.