A field-trial evaluation of a one-pump fibre optic parametric amplifier with an independent polarization gain is experimentally demonstrated. This independent polarization gain was obtained by using the polarization diversity technique. The device was configured as an in-line amplifier for a wavelength division multiplexed system with 5 signals modulated at 10 Gb/s. The signals were propagated through a 33 km optical network. The optical spectra show the effectiveness of the polarization diversity technique in reducing the polarization induced gain fluctuations. Bit error rate characterizations and eye diagram measurements were performed on the signals. Power penalties of 1.1, 0.75 and 3.5 dB were observed for the selected signals for a bit error rate of 1E9. Our results show the feasibility of this technique applied to parametric amplifiers for all optical network applications. © 2011 IEEE. Vetenskap och Konst (KTH),acreo,Instytut Lacznosci - Panstwowy Instytut Badawczy,Vetenskapsradet,STAD-StockholmBerthold, J., Saleh, A.A.M., Blair, L., Simmons, J.M., Optical networking: Past, present, and future (2008) J. Lightwave Technol., 26 (9), pp. 1104-1118. , MayNamiki, S., Kurosu, T., Tanizawa, K., Kurumida, J., Hasama, T., Ishikawa, H., Nakatogawa, T., Oyamada, K., Ultrahigh-definition video transmission and extremely green optical networks for future IEEE J. Sel. Top. Quantum Electron., , in pressAgrawal, G.P., (2001) Nonlinear Fiber Optics, , 3rd ed. New York: Academic PressJamshidifar, M., Vedadi, A., Marhic, M.E., Continuous-wave one-pump optical parametric amplifier with 270 nm gain bandwidth Proc. ECOC 2009, , paper 587285Torounidis, T., Andrekson, P.A., Olsson, B.E., Fiber-optical parametric amplifier with 70-dB ga (2006) IEEE Photon. Technol. Lett., 10, pp. 1194-1196. , MayWong, K.K.Y., Marhic, M.E., Uesaka, K., Kazovsky, L.G., Polarization-independent one-pump fiberoptical parametric amplifier (2002) IEEE Photon. Technol. Lett., 14, pp. 1506-1508. , Novhttp://kyatera.incubadora.fapesp.br/Mussot, A., Lantz, E., Durécu-Legrand, A., Simonneau, C., Bayart, D., Maillotte, H., Sylvestre, T., Simple methods for crosstalk reduction in fiber optical parametric amplifiers (2007) Opt. Commun., 275, pp. 448-452. , MarChavez Boggio, J.M., Guimaraes, A., Callegari, F.A., Marconi, J.D., Fragnito, H.L., Q penalties due to pump phase modulation and pump RIN in fiber optic parametric amplifiers with non-uniform dispersion (2005) Opt. Commun., 249, pp. 451-472. , Jan