Mode area scaling with multi-trench rod-type fibers

Bending performance of large mode area multi-trench fibers.

Bending performance of the Multi-trench Fibers (MTFs) has been investigated using the Finite Element Method. Numerical investigations show that MTFs can provide low-loss effective single mode operation under bent configuration, thanks to the resonant coupling of the Higher order Modes (HOMs). Large ratio between the HOMs and the Fundamental Mode (FM) losses can be ensured, although the ratio dr...

Power Scaling Fiber Amplifiers Using Very-large-mode-area Fibers

Experimental demonstration of single-mode large mode area multi-trench fiber for UV-VIS light transmission

Step-index optical fibers are widely used waveguides for light transmission. However, non-linear effects are always a severe challenge for optical fibers with increasing power level. This challenge is more severe at shorter wavelengths, where core size has to be much smaller in order to maintain a single mode operation. For an example, for 0.005 core refractive index with respect to cladding, a...

Mode interaction in multi-mode optical fibers with Kerr effect

The coupled nonlinear Schrödinger equations (CNLS) which describe two linearly polarized modes interaction (with taken into account the polarization modes interaction) in the Kerr medium is derived. We take first two modes for cylindrical fiber which are also known as HE11 and TE01 modes which have different propagation constant. This approach bases on projection to orthogonal function basis (B...

Transverse Modes in Large-Mode-Area Fibers

This thesis is devoted to the study of transverse modes in large-mode-area (LMA) fibers. It highlights the importance of transverse spatial-hole burning (TSHB) effect in LMA multimode fibers through experiments and simulations. The measured beam-quality factor decreases until the gain becomes saturated in an amplified spontaneous emission (ASE) source based on an Yb-doped LMA multimode fiber. A...