Switchable multi-wavelength fiber laser based on modal interference

Ma Lin†, Jiang Sun, Qi Yan-Hui, Kang Ze-Xin, Jian Shui-Sheng

Transmission spectrum of the up-taper-core-offset-based filter with fiber length L = 94.9 (a), 183.8 (b), 235.3 mm (c), and (d) the relationship between FSR and L .