Abstract
A tunable multi-wavelength fiber laser is proposed and demonstrated based on two main elements: an erbium-doped fiber ring cavity and compact intermodal fiber structure. The modal fiber interferometer is fabricated using the cost-effective arc splice technique between conventional single-mode fiber and microfiber. This optical fiber structure acts as a wavelength filter, operated in reflection mode. When the refractive index and temperature variations are applied over the fiber filter, the ring laser cavity provides several quad-wavelength laser spectra. The multi-wavelength spectra are tuned into the C-band with a resolution of 0.05 nm. In addition, the spectra are symmetric with minimal power difference between the lasing modes involved, and the average of the side mode suppression ratio is close to 37 dB. This laser offers low-cost implementation, low wavelength drift, and high power stability, as well as an effect of easy controllability regarding tuned multi-wavelength.
Highlights
For several decades, the ability to generate tunable or switched multi-wavelength fiber lasers has been one of the focuses pursued by the fiber laser community
The proposed modal fiber interferometer (MFI) structure was set into the ring fiber laser cavity
This arrangement consisted of a pump laser diode (QPHOTONICS QDFBLD-980–500); its signal was incorporated into the ring laser cavity by using an optical fiber wavelength division multiplexer (WDM)
Summary
The ability to generate tunable or switched multi-wavelength fiber lasers has been one of the focuses pursued by the fiber laser community. Many methods have been proposed, most of them based on fiber interferometers (Fabry-Perot, Mach-Zehnder, Michelson, and Sagnac) [15,16,17,18,19], comb filters [20,21], Raman effect [20], Brillion scattering [22,23], nonlinear loop mirrors [24], saturable optical absorber elements [25,26], and extrinsic interferometers [27] These proposed schemes offer compactness, high power stability, minimal wavelength drift, and adequate signal-to-noise ratio, long operation time, and low threshold. Most of the spectra achieved had an adequate side mode suppression ratio, high peak level, lower wavelength drift, and minimal power variation
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