An all-fiber dynamic slope compensator is demonstrated, based on Mach-Zehnder interferometer design. Low voltage and electrical power are used to tune the attenuation slope via thermo-optic effect. A constant average insertion loss mode is demonstated.
N. Azami, N. Azami,
"Thermo-optic all-fiber dynamic slope compensator for gain tilt control", Proc. SPIE 5260, Applications of Photonic Technology 6, (15 December 2003); doi: 10.1117/12.543433; https://doi.org/10.1117/12.543433