Research On The Design Theory And Manafacture Process For A New Dispersion Managed Fiber Pairs

Dispersion managed fiber pairs (DMP) is a new type of technoledgy of dispersion compensation. With the advantage of more stable of dispersion compensation, lower system cost, and less sensitivity of nonlineriaty of optical transmission system, it is becoming hot point in the research field of large capacity and high bit-rate transmission system. A new type of dispersion managed fiber pairs is designed and fabricated by plasma chemical vapor deposition (PCVD) process, the design principle and process optimization are also studied in this paper. The transmission with 40Gbit/s is also successfully achieved based on this new kind of dispersion managed pairs. The main content and achievements are as followe. (1) The design principle and transmission properties of non-zero dispersion-shifted fiber with core-depressed and W type of profile are studied by finite-element method. (2) The ultra large effective core area fiber (ULAF) is successfully developed with the effective-core-area of more than 95μm² and the dispersion of 9 ps/nm·km at 1550nm, which can effectively suppress the effect of nonlinearity on the transmission system. Meanwhile, the attenuation at 1550nm is reduced to around 0.21dB/km, and the splice loss with conventional single mode fiber is less than 0.11dB while keeping the good bending performance ( < 0.02dB on the wavelength range from 1460nm to 1625nm with 60mm bending diameter and 100 turns). The fiber also has a low dispersion slop of less than 0.065ps/nm²Â·km and a low polarization mode dispersion (PMD) of less than 0.05ps/(km)^1/2 . Furthermore, the fiber can be used on the S-band (1460nm –1530nm), C-band (1530nm –1565nm) and L-band (1565nm –1625nm) for wavelength division multiplexing (WDM) system because the zero-dispersion wavelength is shifted to lower than 1440nm. (3) Reverse dispersion fiber (RDF) with depressed-core index profile, which consisit of the dispersion managed pairs together with ULAF, is also successfully developed, which has a core-effective-area of 45μm², dispersion of –19.65ps/nm?km and dispersion slop of –0.132ps/nm²Â·km while maintaining the low bending induced attenuation and low PMD value. Furthermore, the hydrogen induced attenuation at 1530nm is decreased to the value of less than 0.01dB/km by optimized the dopant concentration of deferent core layer. (4) The optical performance of this dispersion managed fiber pairs consisited of ULAF and RDF is researched in this paper. The transmission distance of 320km with 40G/s is achieved successfully without DCF modules. The result shows that this new type of dispersion managed pairs is suitable for large capacity, high bit-rate long-haul wavelength division multiplexing (WDM) transmission system without using dispersion compensation modules.