Bloch oscillations (BOs) of polychromatic beams in circularly curved optical waveguide arrays are smeared out owing to the dependence of the BO spatial period on the wavelength. Here it is shown that restoring of the self-imaging property of the array and approximate BOs over relatively broad spectral ranges can be achieved by the insertion of suitable lumped phase slips uniformly applied across the array.
© 2009 Optical Society of America
Original Manuscript: March 30, 2009
Revised Manuscript: June 10, 2009
Manuscript Accepted: June 12, 2009
Published: July 10, 2009
Stefano Longhi, "Polychromatic optical Bloch oscillations," Opt. Lett. 34, 2174-2176 (2009)