黑体辐射光谱与波长关系，前两阶第二类变型贝塞尔曲线，光波导芯层导模的传播常数，啁啾光栅光谱，LP模的归一化辐射曲线-Blackbody radiation spectrum versus wavelength, the former two-stage variant of the second category Bezier curves, optical waveguide core guided mode propagation constant, chirped grating spec