A multimode light generating module comprises an optical cavity and a light-receiving element. The optical cavity is constituted by a semiconductor optical amplification element, and an optical fiber having a grating. The optical fiber comprises a grating having an apodized periodic refractive index distribution, and the slope of the reflection spectrum in a longer wavelength region with respect to the peak wavelength λp is gentler than that in the shorter wavelength region therewith. The grating satisfies the relationship of 0.5 nmλ0.2−λp0.1 nm. Here, λ0.2 is defined by λ0.2h-λ0.2l, where λ0.2h is the longer one of two wavelengths exhibiting a relative reflectivity of 0.2 with respect to the maximum reflectivity, and λ0.2l is the shorter one of two wavelengths exhibiting a relative reflectivity of 0.2 with respect to the maximum reflectivity.
展开▼
机译：多模式光产生模块包括光学腔和光接收元件。光腔由半导体光放大元件和具有光栅的光纤构成。该光纤包括具有变迹的周期性折射率分布的光栅，并且在较长波长区域中的反射光谱相对于峰值波长λ p 的斜率比在较短波长区域中的斜率缓和。随之而来。光栅满足0.5nm>λ 0.2 -λ p 0.2 由λ 0.2 h -λ 0.2 l 定义，其中λ 0.2 h 是相对于最大反射率而言相对反射率为0.2的两个波长中的较长者，而λ 0.2 l 是相对于最大反射率而言具有0.2的相对反射率的两个波长中的较短者。
展开▼
