Photonics for ultrawideband communications

This paper discussed the applications of ultrawideband frequency technology especially in broadband indoor wireless communication. The concept of UWB-over-fiber was briefly introduced, and the different techniques for generating and encoding impulse UWB signals in the optical domain was discussed. The challenges of implementing UWB-over-fiber system was also examined. The approaches for generating impulse UWB signal in optical domain was classified as UWB pulse generation based on first- or second-order differentiation of a Gaussian pulse, based on differencing of Gaussian pulse, based on optical spectral shaping and frequency-to-time mapping, and based on photonic microwave delay-line filter. Photonic UWB codings using fiber Bragg grating array, multichannel fiber Bragg grating, and polarisation modulator were also discussed.