Wavelength Spacing Tunable, Multiwavelength Q-Switched Mode-Locked Laser Based on Graphene-Oxide-Deposited Tapered Fiber

TL;DR

This paper presents a novel, tunable multiwavelength Q-switched mode-locked fiber laser using graphene oxide on tapered fiber, demonstrating control over wavelength spacing via pump power and revealing bound states of QML.

Contribution

It introduces the first experimental observation of bound states of QML and a new mechanism for fabricating tunable multiwavelength lasers.

Findings

Wavelength spacing can be tuned by pump power.

Bound states of QML are experimentally observed.

The laser's properties depend on taper diameter, length, graphene oxide thickness, and dispersion.

Abstract

A wavelength spacing tunable, multiwavelength Q-switched mode-locked (QML) fiber laser in an erbium-doped fiber cavity based on graphene oxide deposited on tapered fiber is proposed by choosing the diameter and length of the taper, graphene oxide thickness and cavity dispersion, in which the wavelength spacing could be tuned by pump power. The evolutions of temporal and spectral with different pump strengths are investigated. Results show that the tunability of the multiwavelength laser can be interpreted by the bound states of QML laser resulting from a mutual interaction of dispersion, nonlinear effect, insertion loss, and pump power. To the best of our knowledge, it is the first experimental observation of bound states of QML, which provides a new mechanism to fabricate tunable multiwavelength laser.