用于1310nm波长光放大器的掺P_r^(3+)氟化物光纤设计模型

Design Model of Pr Doped Fluoride Optical Fiber Applied to Optical Amplifier Operating at 1310nm

用Ｐ３＋ｒ 离子四能级系统的信号模型研究掺Ｐ３＋ｒ 氟化物光纤放大器的信号特性。模型考虑ＬＰ０１模在阶跃型折射率分布单模光纤中的径向分布以获得激励辐射、信号激发态吸收和泵浦吸收截面，发现最佳截止波长为７５０ｎｍ 且与光纤的数值孔径和输入泵浦功率无关。

The signal Properties of a praseodymium doped fluoride fiber amplifier have been studyed with a signal mode having four level laser system.The model takes into account the LP 01 mode radial field distribution in steo index single mode fiber and obtained stimulated emission,signal excited state absorption and pump absorption cross sections.It has been found that the optimum outoff wavelength is 750μm and independent of numerical aperture and input pump power. The numerical aperture should be made as high as possible.