Abstract:

To restrain the pulse broadening in the communication system, a new type of dualconcentriccore photonic crystal fiber (DCCPCF) composed of single silica material is put forward based on the theory of dispersion compensation. The dispersion value of fundamental mode can achieve up to -6000ps/(nm〖DK〗•km) at 155μm. Analysis indicates that the inner core fundamental and outer core defect mode with phasematching wavelength (λp) as a critical state will propagate forward alternatively between the inner and outer core region, and the effective indices intensely appears fluctuations due to modes coupling at phasematching wavelength. By analyzing the perturbation of dispersion with two structure parameters d1, d2 changing, the instruction for actual fabrication at a certain extent is provided.

Key words: dualconcentriccore photonic crystal fiber, multipole method, inner core fundamental mode, oute r core defect mode, phasematching wavelength