We propose and demonstrate a novel scheme of ultra-wideband (UWB) doublet pulse generation using a semiconductor optical amplifier (SOA) based polarization-diversified loop (PDL) without any assistant light. In our scheme, the incoming Gaussian pulse is split into two parts by the PDL, and each of them is intensity modulated by the other due to cross-gain modulation (XGM) in the SOA. Then, both parts are recombined with incoherent summation to form a UWB doublet pulse. Bi-polar UWB doublet pulse generation is demonstrated using an inverted Gaussian pulse injection. Moreover, pulse amplitude modulation of UWB doublet is also experimentally demonstrated. Our scheme shows some advantages, such as simple implementation without assistant light and single optical carrier operation with good fiber dispersion tolerance.
© 2012 Optical Society of America
Original Manuscript: February 24, 2012
Revised Manuscript: April 18, 2012
Manuscript Accepted: April 20, 2012
Published: June 4, 2012
Bowen Luo, Jianji Dong, Yuan Yu, Ting Yang, and Xinliang Zhang, "Photonic generation of ultra-wideband doublet pulse using a semiconductor-optical-amplifier based polarization-diversified loop," Opt. Lett. 37, 2217-2219 (2012)