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In this article, silica based triangular lattice PCF has been investigatedtowards both narrowband and broadband dispersion compensation for applicationin the communication wavelength. A dual core structure is obtained byintroducing two different air-hole diameters in the cladding of the PCF.Dependence of individual structural parameters towards high negative dispersion(both narrowband and broadband) has been investigated in details with multipolemode based solver. The numerical investigation exhibits narrowband of verylarge negative dispersion of -37,300 ps/nm/km around the wavelength of 1550 nm.Present investigation also reports broadband dispersion values varying from-800 ps/nm/km to -2600 ps/nm/km over a 200 nm wavelength (1400 nm to 1600 nm)range, and kappa values near 300 nm, which matches well with standard singlemode fiber. Using the principle of power transfer from the inner core to theouter core after the coupling wavelength, we have investigated possible designof ASE suppressed amplifier in which wavelengths after the coupling wavelengthcannot be amplified as most of the power tunnel to the outer core, where dopedion does not exist.

ASE suppression in Er3+ doped dual-core triangular lattice Photonic Crystal Fibers (PCFs) for communication wavelength