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

TL;DR

This paper designs a silica-based dual-core triangular lattice photonic crystal fiber with high negative dispersion for communication wavelengths, demonstrating ASE suppression by power transfer to an outer core where dopants are absent.

Contribution

It introduces a novel dual-core PCF structure with tailored dispersion properties and demonstrates ASE suppression through power transfer mechanisms.

Findings

Achieves narrowband negative dispersion of -37,300 ps/nm/km at 1550 nm.

Demonstrates broadband dispersion from -800 to -2600 ps/nm/km over 1400-1600 nm.

Proposes a design for ASE suppressed amplifiers based on core coupling.

Abstract

In this article, silica based triangular lattice PCF has been investigated towards both narrowband and broadband dispersion compensation for application in the communication wavelength. A dual core structure is obtained by introducing 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 multipole mode based solver. The numerical investigation exhibits narrowband of very large 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 single mode fiber. Using the principle of power transfer from the inner core to the outer core after the coupling wavelength, we have investigated possible design of ASE suppressed amplifier in which wavelengths after the coupling wavelength cannot be amplified as most of the power tunnel to the outer core, where doped ion does not exist.