中心下陷的负色散光纤

利用非等温等离子体化学气相沉积成功制得了具有折射率中心下陷的负色散光纤 (RDF)。该光纤在保持较好的抗弯曲性能与偏振模色散的同时 ,有效面积达到 4 5 μm2 ,且在 15 5 0nm处的色散为 - 19.6 5ps/(nm·km) ,色散斜率为 - 0 .132ps/(nm2 ·km)。此外 ,通过优化光纤纤芯各层的掺杂原子浓度 ,在 15 30nm处光纤的氢损降到了0 .0 1dB/km。由负色散光纤与具有超大有效面积的非零色散位移光纤 (ULAF)组成的色散管理光纤对在 15 30nm到16 2 5nm波长范围内的色散斜率小于 0 .0 0 6ps/(nm2 ·km) ,且最大色散值小于 0 .2ps/(nm·km)。同时 ,15 5 0nm波长处的衰耗为 0 .2 2 4dB/km ,且在 15 30nm到 16 2 5nm波段范围内衰耗较为平坦。该色散管理光纤对可以在无需色散补偿模块的前提下应用于大容量高速率的长距离波分复用 (WDM)系统。

Study of the Reverse Dispersion Fiber with Depressed-Core Index Profile

Reverse dispersion fiber (RDF) with depressed-core index profile is fabricated successfully by using plasma-activated chemical vapor phase deposition. The fabricated RDF has a core-effective-area of 45 μm2, dispersion of -19.65 ps/(nm?km) and dispersion slope of -0.132 ps/(nm2?km) while maintaining the low bending induced attenuation and low PMD value. Furthermore, the hydrogen induced attenuation at 1530 nm decreases to the value of less than 0.01 dB/km by optimizing the dopant concentration of different core layer. The dispersion managed pairs, consisting of RDF and non-zero dispersion shifted fiber with ultra large effective-core-area (ULAF), have the ultra low dispersion slope of less than 0.006 ps/(nm2·km) at the wavelength range from 1530 nm to 1625 nm, and the largest dispersion value is lower than 0.2 ps/(nm?km). Moreover, the attenuation characteristic also shows a remarkable flatness over the broad-band wavelength, and the attenuation at 1550 nm is as low as 0.224 dB/km. The dispersion managed pairs are applicable for large capacity, high bit-rate long-haul wavelength division multiplexing (WDM) transmission system without using dispersion compensation mode.