Abstract: Provided is a golf ball manufactured using a golf ball cover coating composition that reduces the influence of external light on a golfer during outdoor use due to low surface gloss and reduces damage to the surface of the golf ball caused by external impact due to excellent impact resistance and cutting resistance. The golf ball cover coating composition may include a base and a hardener. The base may include a modified polyester polyol resin and inorganic particles. The hardener may include a polyisocyanate resin having at least two isocyanate groups.

Abstract: Provided is a golf ball having a matte surface with improved visibility. Since the golf ball has a matte surface in comparison with a golf ball having a glossy surface of the related art, the golf ball has an advantage of preventing the golfer from being dazzled caused by reflection of a dimple surface. Since the golf ball has a relatively high luminance value in comparison with a golf ball having a matte surface of the related art, the golf ball has an advantage of being seen to be larger. Since the amount of light remaining in a dimple cover is increased, fluorescent characteristics of a fluorescent material is improved, so that beautiful colors and improved visibility can be achieved. Therefore, it is possible to improve golfers' performance.

Abstract: Provided is a golf ball manufactured using a golf ball cover coating composition that reduces the influence of external light on a golfer during outdoor use due to low surface gloss and reduces damage to the surface of the golf ball caused by external impact due to excellent impact resistance and cutting resistance.

Abstract: A dispersion compensation device and an optical transmission system are capable of simultaneously compensating a dispersion value and dispersion slope in a single-mode optical fiber in a high-speed long-distance optical transmission system and a wavelength division optical transmission system. The dispersion compensation device includes N number of component optical fibers arranged in a serial fashion, N being a positive integer more than one, wherein each of the component optical fiber has a different dispersion value per a unit length, a dispersion slope per a unit length, and a different length.

Abstract: Disclosed relates to an L-band optical fiber amplifier which amplifies an L-band optical signal of 1570 nm to 1610 nm. In general, when a pumping light of 980 nm for example, output from a pumping light generating laser diode, is supplied to an erbium doped fiber EDF, an amplified spontaneous emission ASE having a bandwidth of 1530 nm to 1560 nm, namely, C-band is generated. The L-band optical fiber amplifier of the invention is configured in a manner that ASE transmitted in the backward direction, or a predetermined wavelength light selected from the bandwidth of 1530 nm to 1560 nm is reflected by a reflecting means and re-injected to EDF. A fiber bragg grating FBG or a reflecting mirror is applied as the reflecting means. The reflected light from the reflecting means is re-injected to EDF and acts as the pumping light, thus increasing the amplification gain for the L-band input light remarkably.