title: Switchable UWB pulse generation using a polarization maintaining fiber Bragg grating as frequency discriminator.
abstract: We propose and successfully demonstrate a novel approach to optically generate ultrawideband (UWB) pulse with switchable shape and polarity by using a polarization-maintaining fiber Bragg grating (PM-FBG) as frequency discriminator. Depending on the shape of the reflective spectrum of the PM-FBG, the system can function as a first- or second-order differentiator for the generation of Gaussian UWB monocycle or doublet pulses. Consequently, the shape and the polarity of the generated UWB pulse can be switched by simple adjustment of a polarization controller (PC). Gaussian monocycle and doublet pulses were successfully obtained with fractional bandwidths of about 188% and 152%, respectively. Higher-order UWB pulses with spectrum covering from 2.9 GHz to 9.8 GHz have also been obtained through adjustment of the PC.
authors.affiliation: Institute of Photonics Technology, Jinan University, Guangzhou, China. eexhfeng@gmail.com
authors.forename: Xinhuan
authors.initials: X
authors.lastname: Feng
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Li
authors.forename: Bai-Ou
authors.initials: BO
authors.lastname: Guan
authors.forename: C
authors.initials: C
authors.lastname: Lu
authors.forename: H Y
authors.initials: HY
authors.lastname: Tam
authors.forename: P K A
authors.initials: PK
authors.lastname: Wai
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008872:Microwaves; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*