Optical wave guides 20 Fiber optics 7 Optical fibers 6 Wavelength division multiplexing 6 Optical communications 4 Brillouin scattering 3 Optical amplifiers 3 Photonics 3 Wave guides 3 Graphene 2 Optical fiber communication 2 Optical properties 2 Semiconductors 2 Computer simulation 1 Equipment and supplies 1 Integrated optics 1 Isotopes 1 Lithography 1 Materials 1 Mirrors 1 Optical fiber detectors 1 Orthogonal frequency division multiplexing 1 Oxides 1 Photolithography 1 Physics 1 Plasma etching 1 Polymers 1 Praseodymium 1 Refractive index 1 Resonators 1