UFGS 27 13 23.00 40 Communications Optical Backbone Cabling

2.1.1.2 Single Mode Fiber Media.Provide FO single mode media with outer sheath jacket,[ strength member,]ripcords, water blocking material,[ optional steel shield,] core tube, andcore fibers as installed in a permanent underground pathway system as shownon the construction drawings. Media shall have all glass, dual window,graded index material with a core diameter of [____][8.7] microns. Coatfiber with a cladding material which is concentric with the core. Fibercladding diameter shall be nominal 125 microns. Media shall have atransmission window centered at 1300 and 1550 nanometer wavelengths,attenuation at 1550 nanometers shall be less than 0.5 dB per kilometer. FOmedia shall comply with TIA/EIA-472DAAA,and TIA-758.2.1.2 Cable LengthCable shall be manufactured continuous with no factory splices.2.1.3 Materials and ConstructionMaterials used within a given cable shall be compatible with all othermaterials used in the same cable when such materials come into intimatecontact. All cable components used shall have no adverse affect on opticaltransmission or on the mechanical integrity characteristics of the fiberplaced in the cable. All materials used shall be non-toxic, non-corrosive,and present no dermal hazard.Minimum required material components applied to fiber optic cableconstruction shall be central core member, color-coded optical fiber,color-coded loose tube buffer with gel-filling, gel-filling around loosetube, inner jacket, pulling strength members, and outer jacket. Variationsin sequence and construction structural components will be considered whennecessary.2.1.3.1 Central Core MemberInclude a central core member to serve as a cable core foundation to reducestrain on the fibers but not to serve as a pulling strength member.Material of the central core member shall be non-metallic.2.1.3.2 Optical FibersTwo types of optical fibers, single-mode fiber and multi-mode fiber, shallbe contained in the cable and shall be as follows:Single-Mode (SM) fiber must be the equivalent [step] [graded] indexoptical glass. Core diameter of the fiber shall be approximately 8.7micrometer. Cladding diameter shall be 125 plus or minus 3 micrometer.Core cladding offset shall be less than 1 micrometer. Minimum tensilestrength of the fiber after primary protective coating shall be greaterthan 350,000 kilopascal 50,000 psi . Softening point of the cladmaterial of the optical fiber shall be 1630 degrees C plus or minus 50degrees C in accordance with ASTM C338, or the optical fiber shall meetthe requirements in paragraph entitled, "Splice Compatibility Test."Multi-Mode (MM) fiber shall be the [graded] [step] index optical glass.Core diameter of the fiber shall be [50] [62.5] plus or minus 3micrometer. Cladding diameter shall be 125 plus or minus 3 micrometer.Core-cladding offset shall be less than 3 micrometer. Minimum tensileSECTION 27 13 23.00 40 Page 14