大容量长距离传输用低非线性效应非零色散位移光纤

利用非等温等离子体化学气相沉积 (PCVD)工艺制备了一种适合于大容量高速率长途干线网与城域网的中芯下陷型纤芯结构非零色散位移光纤。该光纤的有效面积大于 95 μm2 ,在 15 5 0nm波段的色散值约为9ps/(nm·km) ,有效的抑制了传输过程中光非线性效应的产生。通过对光纤剖面结构的优化设计 ,光纤的 15 5 0nm处的传输损耗降到约 0 .2 1dB/km ,与传统单模光纤的熔接损耗低于 0 .11dB ,且在直径为 6 0mm圆筒上绕 10 0圈后在 14 6 0nm到 16 2 5nm波长范围所引起的附加弯曲损耗均低于 0 .0 2dB/km。同时 ,该光纤色散斜率低于0 .0 6 5 ps/(nm2 ·km) ,偏振模色散 (PMD)小于 0 .0 5 ps·km-1/2 。此外 ,由于光纤的零色散点移到了 14 30nm以下 ,使波分复用 (WDM)传输在S波段 (14 6 0～ 15 30nm)、C波段 (15 30～ 15 6 5nm)、L(15 6 5～ 16 2 5nm)波段上都兼容。

Non-Zero Dispersion-Shifted Optical Fibers with Low Nonlinearity for Large Capacity and Long-Haul Transmission System

A non-zero dispersion-shifted fiber with core-depressed profile for large capacity and high bit rate backbone network and metropolitan area network is designed and fabricated by plasma chemical vapor deposition (PCVD) process. The designed fiber has the effective-core-area of more than 95 μm2 and the dispersion of about 9 ps/(nm·km) at 1550 nm, which can suppress the nonlinearity on the transmission system effectively. Meanwhile, the attenuation at 1550 nm is reduced to around 0.21 dB/km, and the splice loss with conventional single mode fiber is less than 0.11 dB while keeping the good bending performance (bending loss is less than 0.02 dB/km on the wavelength range from 1460 nm to 1625 nm with 60 mm bending diameter and 100 turns). The fiber also has a low dispersion slope of less than 0.065 ps/(nm2·km) and a low polarization mode dispersion (PMD) of less than 0.05 ps·km-1/2. Furthermore, the fiber can be used on the S-band (1460～1530 nm), C-band (1530～1565 nm) and L-band (1565～1625 nm) for wavelength division multiplexing (WDM) system because the zero-dispersion wavelength is shifted to lower than 1430 nm.