We propose a kind of trench-assisted graded-index ring-core fiber(TA-GI-RCF)with a low refractive index rod deployed in ......

本文运用有效折射率法把脊形波导化成等效二维平板波导后,再运用微分法求出弱吸收情况下波导模的吸收损耗,其方法简便,精确度高.更......