Nonlinear optical polymers for effective wavelength conversions in optical fiber communications

POLY 521

Seung Koo Park, skpark@etri.re.kr, Suntak Park, Min-su Kim, kimms@etri.re.kr, Jung Jin Ju, jjju@etri.re.kr, Jin Tae Kim, myjinny@etri.re.kr, and Myung-Hyun Lee, mhl@etri.re.kr. IT Convergence & Components Laboratory, Electronics and Telecommunications Research Institute, 161 Gajeong-dong, Yuseong-gu, Daejeon, 305-700, South Korea
In order to develop a new nonlinear optical material with a high second-order nonlinear optical coefficient (d33) and low optical loss at a wavelength of 1.55 mm for all-optical wavelength converters, we designed and synthesized a monomer with 2-(methyl-{4-[(6-nitro-benzenothiazol-2-ylimino)-methyl]-phenyl}-amino)-ethanol and some fluorine group and successfully obtained an NLO copolymer from 1-pentafluorophenyl-pyrrole-2,5-dione, 2,2,2-trifluoroethyl acrylate, and the monomer. The NLO polymer film is prepared well, and its second-order nonlinear optical coefficient is as high as around 22 pm/V at a wavelength of 1.55 mm. Tg of the copolymers varies with the copolymer composition. The copolymer films are also expected to decrease the optical loss at a wavelength of 1.55 mm since fluorine group is partly substituted for hydrogen group in their polymer backbone structures. We are attempting to investigate further the optimal chromophore concentration and poling conditions of the copolymer for a high d33 and low optical loss at a wavelength of 1.55 mm. Also, the details of the optical properties of the NLO polymer materials will be discussed with consideration of their real application to polymer wavelength converters.