半导体分布反馈激光器的等效耦合系数

Effective Coupling Coefficient of Semiconductor DFB Lasers

通过引进等效耦合系数，首次考虑了具有缓变波导和复折射率耦合DFB激光器中辐射与高阶分波耦合对等效耦合系数的影响，数值计算结果表明，对实折射率耦合DFB激光器，采用线性缓变波导能获得较大的等效耦合系数的相位，对复折射率耦合DFB激光器，即使是纯损耗耦合，等效耦合系数的相位也不等于－π／2，如果实折射率耦合与损耗耦合同时存在，则在某些情况下，等效耦合系数的相位会等于零．

An effective coupling coefficient has been introduced for semiconductor DFB lasers with GRIN waveguide and complex coupled gratings for the first time when radiation and other partial waves coupling are taking into account. Numerical results show that a linear GRIN waveguide can increase the phase of the effective coupling coefficient of real index coupled DFB lasers. In some special cases, the effective coupling coefficient phase will be equal to zero although both real index and loss coupling are presented simultaneously.