Samsung Electronics Co., Ltd.

Kwan-Soo Han

Tae-Hyung Rhee

Jung-Hee Kim

Kyung-Hee You

Eun-Ji Kim

Tae-hyung Rhee

Woo-Hyuk Jang

Woo-hyuk Jang

Eun-ji Kim

Woo-Hyeuk Jang

Dong-Hack Suh

The present invention provides an optical polyimide precursor for use in making a polyimide. The precursor is defined by the following formula:wherein X is Cl, Br, oxo-halide, or fully halogenated alkyl, and A is a divalent aromatic or halogenated aromatic moiety. The present invention provides a method of preparing a diamine compound for use as an optical polyimide precursor. The method includes the steps of dissolving 2-chloro-5-nitrobenzotrifluoride and a diol in N,N-dimethylacetamide to form a solution, adding potassium carbonate, tert-butylammonium chloride and copper powder to said solution and heating the resulting mixture, removing the copper, precipitating and recrystallizing a dinitro-compound resulting from heating the mixture, and dissolving the dinitro-compound and reducing the dinitro-compound to yield a diamine compound.

Optical polyimide precursor, optical polyimide compound and fabricating method thereof

Optical waveguide

A polyimide for optical communications, which is expressed by the formula (1)

Polyimide for optical communications

A polyimide for optical communications, which is expressed by the formula (1), a method of preparing the same, and a method of forming multiple polyimide films using the polyimide, wherein the formula (1) is given by

Polyimide for optical communications, method of preparing the same, and method of forming multiple polyimide film using the polyimide

The present invention discloses a polymer optical waveguide and a method of fabricating the same. The polymer optical waveguide comprises a core formed of polymer containing fluoride (F) of a 12-37 wt % on the basis of total weight of the polymer, and having repeating units with at least two &mdash;C(&boxH;O)&mdash;N&mdash;C(&boxH;O) functional groups or at least four &mdash;N&mdash;C(&boxH;O)&mdash; functional groups; and a cladding in contact with the core and formed of polymer having a refractive index lower than the polymer for forming the core. If a core layer is etched according to the ICP etching method, the etch rate becomes at least three times faster than that of the conventional RIE etching method. Also, etching characteristics including uniformity of an etched plane and vertical profile are improved, thereby reducing damage to an optical waveguide. Thus, the light scattering loss of the optical waveguide can be minimized. Also, the method for fabricating of a polymer optical waveguide according to the present invention is useful for mass production of polymer optical waveguides.

Polymer optical waveguide and method for fabricating the same

Polyarylene ether for optical communications, expressed by the formula 1: ##STR1## The polyarylene ether has excellent resistance to heat and film processing properties and the light absorption loss in the wavelength range for optical communications is low. Also, by controlling the copolymerization ratio of a monomer whose hydrogen of C--H bond is substituted by F and a monomer whose hydrogen of C--H bond is substituted by Cl, the refractive index of the polymer can be adjusted to a level suitable for an optical material used for optical communications.

Polyarylene ether for optical communication

An optical polymer composition in which polymers having the same repeating units with different polymerization ratios are mixed in an arbitrary ratio. An optical material having a desired refractive index can be attained by appropriately adjusting the mixing ratio based on weight. With such a composition, it is easy to finely adjust the difference in refractive indices between a core and a cladding forming an optical waveguide, thus an optical waveguide device can be easily fabricated.

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Seoul, South Korea

Kwan-Soo Han