Colloquium: Frank Wise

    Date: 
    Thursday, March 5, 2015 - 3:30pm - 5:00pm
    Location: 
    Meinel 307
    Description: 

    "Spatiotemporal Dynamics of Optical Pulse Propagation in Multimode Fibers"

    Abstract(s): 

    As optical fiber communications and fiber lasers approach fundamental limits, interest in multimode fibers has grown. Optical fibers designed to support multiple transverse modes offer opportunities to study wave propagation in a setting that is intermediate between single-mode fiber and free-space propagation. However, there are very few experimental studies of nonlinear pulse propagation in multimode fiber.

    As in single-mode fiber, solitons may be particularly important. Multimode solitons consist of synchronized, nondispersive pulses in multiple spatial modes, which interact via the Kerr nonlinearity of the fiber. Theoretical and experimental studies of the basic properties and spatiotemporal behavior of solitons in graded-index multimode fiber will be presented, with emphasis on soliton formation, fission and Raman dynamics.

    At higher powers, spatiotemporal effects reminiscent of nonlinear optics in bulk media — self-focusing and multiple filamentation — are observed at a fraction of the critical power. In addition, megawatt ultrashort pulses tunable between 1550 and 2200 nanometers, dispersive waves over one octave, intense combs of visible light, or multioctave-spanning continua can be generated on demand.

    Possible directions for studies of new nonlinear wave physics in multimode fibers will be discussed along with potential applications.

    Speaker Bio(s): 

    Frank Wise received a B.S. in engineering physics from Princeton University, an M.S. in electrical engineering from the University of California, Berkeley, and a Ph.D. in applied physics from Cornell University. Before Ph.D. studies at Cornell, he worked on advanced integrated circuits at Bell Laboratories. Since receiving the Ph.D. in 1989, he has been on the faculty in applied physics at Cornell. His group has efforts in nonlinear optical pulse propagation and semiconductor nanostructures.