A tunable self-seeded Brillouin/erbium fiber laser utilizing an asymmetrical twin core fiber based Mach–Zehnder interferometer

Abstract

A tunable self-seeded Brillouin/erbium fiber laser (BEFL) utilizing an asymmetrical twin core fiber based Mach-Zehnder interferometer (ATCF-MZI) is proposed and demonstrated. The proposed self-seeded BEFL has the advantage of being able to generate up to 17 output channels with high optical signal to noise ratio ( >10 dB). The Brillouin pump is self-seeded in the laser cavity instead of the extra Brillouin pumping. By bending the ATCF-MZI, an 8 nm wavelength-tunable range is achieved. This self-seeded BEFL shows linear tunability and good stability. Meanwhile, the experimental results indicate that the laser output with operation wavelength away from the free-running cavity mode has better output characteristics.

Tunable multi-wavelength erbium-doped fiber laser by cascading a standard Mach–Zehnder interferometer and a twin-core fiber-based filter

“…Actually, the TCF-based filter is hung between two fiber holders, as shown in figure 1(c), and it is sensitive to external perturbations in a practical application. To overcome this problem, an improved setup can be applied to realize the bending adjustment as described in [31,32]. In this improved setup, the TCF-based filter can be pasted onto a thin steel beam which is bent with a micro-driver in the middle.…”

Tunable thulium-doped fiber laser based on an abrupt-tapered in-fiber interferometer

“…Typical values for the FSR in abrupt-tapered fibers are in the range from 0.7 to 9.1 nm [28]. Some authors have implemented different wavelength tuning methods by using tapered fibers as spectral filters [29][30][31].…”