DyBi Garnet Films with Improved Temperature Dependence of Faraday Rotation

Polarization characteristics of a reflective erbium doped fiber amplifier with temperature changes at the Faraday rotator mirror

“…The minimum extinction ratio r min (worst case) is then given by: Figure 2 shows the minimum extinction ratio for two FRMs (whose Faraday rotators are made of YIG and BIG materials respectively) as a function of the temperature deviation from the temperature at which the Faraday rotator was adjusted to 45º (T adjusted ). The temperature dependence of ∆ϑ is approximately 0.04 deg/ºC for YIG and 0.11 deg/ºC for BIG [6]. From Fig.…”

“…Therefore, changing each magnetization contribution of the sub-lattices to the sum of saturation magnetization, or changing the quantity and types of the substituted ions or rare-earth ions in the sub-lattices, the temperature dependence of the Faraday rotation can be modified. Thus, small variations of the rotation angle can take place in the 45º Faraday rotator when it suffers temperature changes [6]. However, the temperature sensitivities are different depending on the ferromagnetic material of the rotator.…”