LARGE-MODE-AREA DISPERSION COMPENSATING FIBRE

Abstract

We present alarge-mode-area dispersion compensating fiber (DCF) design amenable to fabrication by modified chemical vapor deposition (MCVD) technique. The proposed design consists of two concentric cores, one of which is highly asymmetric. The resonance between the two cores leads to high negative dispersion. The magnitude and wavelength bandwidth of negative dispersion can be controlled by various design parameters. Here we demonstrate numerically simulated designs for (i) narrow band dispersion compensation and (ii) broad-band dispersion compensation. In narrowband DCF designs we show that the negative dispersion at 1550 mn wavelength can be tuned in the range -1000 to -14500 ps/nm.km with corresponding mode effective areas ranging between 120 um2 and 33 um2. In the broadband designs, we show dispersion ranging between -80 and -280 ps/nm.km over a 40 mn wavelength range, kappa values near 30 nm, figure of merit 1030 ps/dB.km, and mode effective area 63 μm2, which matches well with large effective area fiber (LEAF). The fiber shows a bending loss of 104 dB/km for narrowband DCF and 0.03 dB/km for broadband DCF at a bending radius of 15 mm. A fiber with such a high dispersion and large effective area would be useful for efficient dispersion compensation in single-wavelength as well as WDM optical communication system.