Abstract
ABSTRACT In order to overcome the defects of G.652 and G.655 optical fibers, new types of ITU recommendation G.656 optical fiber are introduced in the paper. Based on the theory of waveguide, the design principle was described. Several types of G.656 optical fiber are introduced here; these types optical fiber can be used for long haul transmission system and metro network. CWDM and DWDM can also be applied on S+C+L bands with these types fiber. These fibers are manufactured by PCVD process. The minimum dispersion value from 1460nm to 1625nm is greater than 2ps/nm km; the maximum value is less than 14ps/nm km. The effec tive area at 1550nm is around 52 to 66µm 2 . The excellent polarization mode dispersion properties help the fiber to m eet the requirement of high bit rate tran smission. The PMD co efficiency of these fibers is less 0.05 ps/km 1/2 . By use of improved PCVD process, excellent attenuation of these fibers was obtained, the water peak around 1385nm is almost removed; attenuation from 1310nm to 1650nm is less than 0.4 dB/km, attenuation at 1550nm is less than 0.22dB/km. Excellent attenuation performance will help the fiber to utilize the bandwidth effectively. Keywords: low water peak, wide band, S+C+L, G.656, optical fiber
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