A Multi-Wavelength Thulium-Doped Fiber Laser Using a Photonic Crystal Fiber-Based Sagnac Loop

Abstract

A multi-wavelength thulium-doped fiber laser incorporating a photonic crystal fiber (PCF) Sagnac loop was presented and experimentally demonstrated. In the laser cavity, the Sagnac loop mirror used a 0.5 m PCF as a comb filter. A nonlinear polarization rotation (NPR)-based 600 m single-mode fiber (SMF) was used to suppress the mode competition. By adjusting the polarization controllers (PCs), up to nine stable wavelength outputs near the 2 μm spectrum were obtained at room temperature with an optical signal-to-noise ratio (OSNR) of up to 30 dB. The channel spacing of this fiber laser is 4.88 nm, and the 10 dB bandwidth encompasses 1950.39 to 1989.43nm.

Numerical analysis of an all-fiber plasmonic polarization filter using dual elliptical gold thin layers deposited photonic crystal fiber

“…Stimulating the SPR effect in the proposed PCF filter, and produces single-mode single-polarized (SMSP) light in the x-polarized direction. The OSA (Yokogawa AQ6375) with a resolution of 0.05 nm, covering detected ranging from 1200 nm to 2400 nm [53], is employed to observe and capture the output signal, performs multiple experiments for analysis, establishes the actual performance, and ultimately contrasts it with the simulation results. Furthermore, various practical factors influencing filtering performance, such as fusion losses, stress, and temperature, can also be considered.…”