Vector rectangular-shape laser based on reduced graphene oxide interacting with a long fiber taper

Abstract

Abstract-A vector dual-wavelength rectangular-shape laser (RSL) based on a long fiber taper deposited with reduced graphene oxide is proposed, where the nonlinearity is enhanced due to large evanescent-field-interacting length and strong field confinement of a 8 mm fiber taper with a waist diameter of 4 μm. Graphene flakes are deposited uniformly on the taper waist with light pressure effect, so this structure guarantees both excellent saturable absorption and high nonlinearity. The RSL with a repetition rate of 7.9 MHz exhibits fast polarization switching in two orthogonal polarization directions, and the temporal and spectral characteristics are investigated. The results suggest that the long taper-based graphene structure is an efficient choice for nonlinear devices.

Cross-Phase Modulation Instability in Mode-Locked Laser Based on Reduced Graphene Oxide

“…The taper-graphene saturable absorber (SA) is produced via depositing reGO flakes onto the fiber taper via light pressure [23,24]. The reGO solution has to be dissolved well and centrifuged to get transparent solution, and the injection laser power has to be selected properly for a controllable deposition process.…”

Novel nanomaterials based saturable absorbers for passive mode locked fiber laser at 1.5 μm

“…Zhang et al obtained a dispersion management soliton with a pulse width of 240 fs in the near-zero dispersion region [266], which is the shortest pulse width among multilayer graphene SA-based EDFL. Similarly, the evanescent field interaction integration scheme can also be used to generate EDFL by using specialty fibers, such as side-polished fibers [29-32, 267, 268], micronano fibers [269][270][271], tapered fibers [30, 272,273], hollow optical fibers [274] and planar light wave circuits [275,276]. In 2010, Song et al first transferred a graphene film onto the polished plane of a D-type fiber.…”

Perturbation theory for graphene-integrated waveguides: Cubic nonlinearity and third-harmonic generation

“…A graphene coated dielectric fibre represents one simple example of graphene integrated photonic structures [14,15,23]. Profiles and propagation constants of all guided modes in a step-index dielectric fibre can be obtained semi-analytically [27].…”

“…These discoveries make graphene the particularly attractive material for integration with various nonlinear photonic components, such as waveguides and cavities. Indeed, a considerable boost of third-order nonlinear processes has been demonstrated in a graphene-coated photonic crystal cavity [12], a photonic crystal waveguide [13], and silica micro-fibres [14,15].…”