摘要:
An optical cable has an S-Z stranded part in which plurality of chamber elements containing optical fibers are assembled around a central member in an S-Z strand in the state where their bottom faces are in contact with the central member. Each chamber element has such a characteristic that its flexural rigidity in the depth direction of its fiber containing cavity is smaller than that in the widthwise direction thereof. Assuming, of distortion energy of the chamber element in an S-Z reverse portion within the S-Z stranded part, the distortion energy in the case where the bottom face of the chamber element is in contact with the central member to be U.sub.1, and the distortion energy in the case where a side face of the chamber element is in contact with the central member to be U.sub.2, a relational expression of .DELTA.U=U.sub.1 -U.sub.2 .ltoreq.0.2(mJ/mm) is satisfied.
摘要翻译:光缆具有S-Z绞合部分,其中包含光纤的多个腔室元件在其底面与中心构件接触的状态下组装在S-Z绞线的中心构件周围。 每个腔室元件具有其包含纤维的空腔的深度方向上的弯曲刚度小于其在其宽度方向上的弯曲刚度。 假设在SZ绞合部分中的SZ反向部分中的腔室元件的变形能量,腔室元件的底面与中心构件接触的情况下的失真能为U1,并且在 腔室元件的侧面与中心构件接触为U2的情况下,满足DELTA U = U1-U2 <0.2的关系式(mJ / mm)。
摘要:
An optical cable has a plurality of one-groove spacers 3 which are twisted in one direction around a central member 1. Anti-tensile elements 2 are arranged in the central portion of the central member 1. Each one-groove spacer having a single groove which is linear lengthwise and substantially square in cross section and holding a stack of a plurality of optical fiber ribbons 4. The inner width and the height of the side walls of the groove of the one-groove spacer are set greater than the diagonal length of the stack. Therefore, the transmission loss becomes reducible because the contact portions of the optical fiber ribbons with respect to the side walls of the grooves vary in the longitudinal direction, thus preventing a specific number of optical fibers from being continuously subjected to edgewise pressure.
摘要:
In the optical cable in accordance with the present invention, the reversal angle &phgr; from one reverse portion to the next reverse portion in an S-Z type helical groove is at least 180 degrees; and, letting W, T, and n be the width and thickness of each optical fiber ribbon and the number of stacked sheets of optical fiber ribbons, respectively, and a and b be the width and depth of the helical groove, respectively, at least each reverse portion of the helical groove has a cross-sectional form satisfying: nT
摘要:
In an optical fiber cable with a jacket in which a plurality of optical fibers are assembled as being S-Z stranded about a central member, a ferromagnetic member is disposed near an inner peripheral surface of the jacket along an S-Z stranded line formed by one of the optical fibers.
摘要:
An optical cable has a plurality of optical fibers. The optical fibers are contained in fiber containing cavities of chamber elements. Each chamber element has a bottom part and a pair of side wall parts, which defines a fiber containing cavity. The individual chamber elements containing the optical fibers are assembled around a thickening layer in an S-Z strand. Each side wall part is formed such that its thickness gradually decreases from its base end portion toward free end portion. Also, the thickness of the bottom part is greater than the thickness of each side wall part.
摘要:
In an optical cable made by forming a sheath on enclosing one or more optical fiber cores and a tension member, high reliability is obtained through the avoidance of adverse effects on the optical fiber core of a curving tendency of the tension member prevailing over the resistance of the sheath to curving (for example, due to the installed optical cable being heated by electrical equipment in proximity) and the optical cable consequently curving. Taking the plane containing the curve formed by the tension member due to its curving tendency as a base plane, the optical fiber core is disposed in the proximity of the position of the image formed when the tension member is projected in a direction perpendicular with respect to the base plane onto a flat plane separate from and parallel with the base plane. If the optical fiber core is an optical fiber ribbon comprising a plurality of optical fibers lined up in a flat plane and coated en bloc, then as an additional condition, an alignment line obtained by joining the centers of the optical fibers at both sides of the optical fiber ribbon is disposed perpendicular to the base plane.
摘要:
An optical fiber cable is constituted by a cylindrical spacer having on its surface helical grooves reversing their direction at a given pitch in which a stack of ribbon optical fibers is received. In the optical fiber cable, the reverse angle ø of the groove is 210°≦ø≦330°; the groove has a size to contain a virtual circle therein whose diameter D is represented by equation of D=(W2+(N·T)2)½ where W is the width of the ribbon optical fiber, T is the thickness of the ribbon optical fiber, and N is the number of the ribbon optical fibers stacked in a groove; the angle &thgr; formed between each of side walls of the groove and a line connecting the center of the bottom of the groove and the center of the spacer varies periodically; and the angle &thgr; of the side wall on the inner side of the curvature of the center of the groove increases continuously and monotonously at least over the part extending from a position distant from a helical portion between adjacent reverse portions at approximately 90° in a circumferential direction to the next reverse portion.
摘要:
The present invention relates to a dispersion-shifted fiber having a structure which can restrain the bending loss caused by enlargement in mode field diameter from increasing. This dispersion-shifted fiber is a single-mode optical fiber mainly composed of silica glass and has a cutoff wavelength not shorter than the wavelength of signal light at its length of 2 m and a zero-dispersion wavelength within the range of 1.4 .mu.m to 1.7 .mu.m. Further, the mode field diameter in this dispersion-shifted fiber is 9.0 .mu.m or more.
摘要:
One or more optical fiber elements each constituted by a coated glass fiber are fed to an over-coating device and an over-coating is applied to the optical fiber elements in a lump, the feeding speed of the optical fiber elements to the over-coating device is made larger than the take-up speed of the over-coated optical fiber onto a take-up reel so as to give longitudinal compression strain to the glass fibers of the over-coated optical fiber. The glass fiber has compression strain of not less than 0.03% to less than 0. 10% in a longitudinal direction thereof at room temperature.
摘要:
A styrene-based resin composition comprising (A) a styrene-based polymer and (B) a rubber-like polymer dispersed in the styrene-based polymer. The dispersed particles of the rubber-like polymer comprise a styrene-butadiene-based block copolymer comprising 5 to 95% by weight of a conventional diblock-type polymer and 95 to 5% by weight of a tapered block-type polymer, wherein the butadiene unit content of the styrene-butadiene-based block copolymer is 6 to 16% by weight, based on the weight of the composition. The particles have a weight ratio of gel content to rubber-like polymer of 1.1:1 to 4.0:1 and have a swelling index of 5 to 20. The particles have an area average diameter of 0.1 to 0.9 .mu.m, with a ratio of area particle diameter to number average particle diameter of 1.0 to 1.8. The styrene-based resin composition has a high Izod impact strength and a high drop-weight impact strength, and further has excellent gloss and stiffness properties.