Lali-Dastjerdi, Zohreh1; Galili, Michael1; Mulvad, Hans Christian Hansen1; Hu, Hao1; Oxenløwe, Leif Katsuo1; Rottwitt, Karsten1; Peucheret, Christophe4
1 Department of Photonics Engineering, Technical University of Denmark2 High-Speed Optical Communication, Department of Photonics Engineering, Technical University of Denmark3 Fiber Optics, Devices and Non-linear Effects, Department of Photonics Engineering, Technical University of Denmark4 Systems, Department of Photonics Engineering, Technical University of Denmark
We report the first experimental demonstration of parametric amplification and all-optical phase-preserving amplitude regeneration for a 640 Gbit/s return-to-zero (RZ) differential phase-shift keying (DPSK) optical time division multiplexed (OTDM) signal. In the designed gain-flattened single-pump fiber optical parametric amplifier (FOPA), 620 fs short optical pulses are successfully amplified with 15 dB gain with error-free performance and less than 1 dB power penalty. Phase-preserving amplitude regeneration based on gain saturation in the FOPA is carried out for optical signals with degraded optical signal-to-noise ratio. An improvement of 2.2 dB in receiver sensitivity at a bit-error-ratio of 10−9 has been successfully achieved after regeneration, together with 13.3 dB net gain.
Optics Express, 2013, Vol 21, Issue 22, p. 25944-25953