Abstract
Based on tapered Triple-Core Photonic Crystal Fiber (TCPCF), a high performance tunable Dual-Wavelength Erbium-Doped Fiber Laser (DW-EDFL) is proposed and experimentally demonstrated. The mode-coupling among three cores of TCPCF appears periodically and becomes further enhanced in tapered TCPCF, which are beneficial to form a filter to select lasing wavelength. A series of tapered TCPCFs with different taper lengths are fabricated and inserted into tunable DW-EDFL as filters. Multiple groups of tunable dual-wavelength lasing outputs are achieved by using the tapered TCPCF filter with a waist diameter of 126 μm. The maximum tunable range can reach up to 14.36 nm and the side mode suppression ratio of all lasing outputs are above 52 dB. In addition, the tunable single- and triple-wavelength lasers are also obtained. The tunable single-wavelength laser has an excellent linear response to strain and can be applied to realize a high-sensitivity strain sensor with the highest strain sensitivity of -13.1 pm/μe.
Highlights
IntroductionThe main obstacle to achieve stable dual-wavelength lasing output is the strong mode competition existed in the laser cavity because of the uniform gain broadening mechanism of erbium-doped fiber (EDF)
Various methods have been proposed such as cooling erbium-doped fiber (EDF) at 77 K by liquid nitrogen [4], adopting a hybrid gain medium [5], [6], utilizing Brillouin-comb assisted four-wave mixing (FWM) [7], inducing nonlinear polarization rotation (NPR) technique in laser cavity [8], [9], introducing nonlinear optical loop mirror (NOLM) [10], constructing
We proposed and experimentally demonstrated a multi-group dual-wavelength tunable EDFL by using the tapered Triple-Core Photonic Crystal Fiber (TCPCF) filters
Summary
The main obstacle to achieve stable dual-wavelength lasing output is the strong mode competition existed in the laser cavity because of the uniform gain broadening mechanism of erbium-doped fiber (EDF). To overcome this problem, various methods have been proposed such as cooling EDF at 77 K by liquid nitrogen [4], adopting a hybrid gain medium [5], [6], utilizing Brillouin-comb assisted four-wave mixing (FWM) [7], inducing nonlinear polarization rotation (NPR) technique in laser cavity [8], [9], introducing nonlinear optical loop mirror (NOLM) [10], constructing. Zhang.et al reported a single- and dual-wavelength tunable DW-EDFL by combing SCF with MZI in which the tunable range are ∼11 nm and 7 nm with the SMSR higher than 45 dB [19]
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