Abstract
In this study, a graphene and optical microfiber coupler (OMC) integrated device (GOMC) was proposed and fabricated. After its characteristic analysis and testing, it was applied to the development of adjustable multi-wavelength fiber lasers. By integrating the OMC with graphene, the polarization dependence of OMC was enhanced. Meanwhile, the novel GOMC was given the capabilities of filtering, coupling, beam splitting, and polarization correlation. When the GOMC was integrated as a filter and beam splitter into the ring cavity of the fiber laser, the proposed GOMC-based fiber laser could achieve single-wavelength and multi-wavelength regulated output. The laser had a 3 dB linewidth of less than 30 pm, a signal-to-noise ratio of approximately 40 dB, and an output power fluctuation of less than 1 dB. The GOMC could also be used for the development of functional devices, such as adjustable mode lockers and mode coupling selectors, which provide an excellent experimental platform for new fiber lasers and the research of multi-dimensional light-field manipulation.
Highlights
In recent years, owing to the advantages of easy integration with existing optical systems and the high sensitivity to external environmental changes, optical microfiber couplers (OMCs) have been widely used in sensing fields and other functional devices [1,2,3,4,5,6,7,8]
The GOMC proposed in this paper was made of a sandwich structure, in which graphene was first placed on a glass slide, and the OMC was fixed on the glass slide
The test results of the GOMC spectral transmission experience, the geometric asymmetry of the GOMC and the natural absorption of graphene were the characteristics are shown in Figure 4, in which the red solid line and the dotted line are the main factors to the non-conjugation of the characteristic spectrum of the device
Summary
In recent years, owing to the advantages of easy integration with existing optical systems and the high sensitivity to external environmental changes, optical microfiber couplers (OMCs) have been widely used in sensing fields and other functional devices (especially by the fusing and tapering of two conventional fibers) [1,2,3,4,5,6,7,8]. Due to the large evanescent field transmission properties of optical microfibers (OMs), its integration with 2D materials can effectively enhance the interaction between light and materials, which have been developed into fiber optic functional devices, such as polarizers, modulators, and saturated absorbers (mode lockers) [13,14,15,16]. It is foreseeable that based on the GOMC, all-optical tunable mode lockers, filters, and mode-coupled selectors with better temperature control effects can be developed It can provide optional functional devices and experimental platforms for the development of new fiber lasers and multi-dimensional light-field control research
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