AU - Abbasi, Seyed Peyman AU - Varzkari, Hamed AU - Mahdieh, Mohammad Hossein TI - Laser Diode Electro-optics Characteristics Improvement by Graded Index Refractive Index Profile Broadened Waveguide PT - JOURNAL ARTICLE TA - opsi JN - opsi VO - 24 VI - 0 IP - 0 4099 - http://opsi.ir/article-1-1583-en.html 4100 - http://opsi.ir/article-1-1583-en.pdf SO - opsi 0 ABĀ  - Thickness and refractive index of waveguide layer determine the electro-optic characteristics in semiconductor lasers. In this research the stepped refractive index profile was replaced by suitable broadened graded refractive index in waveguide layer. The results show such design can significantly improve the vertical divergence and threshold current for laser operating in constant efficiency. In order to preventing of slop efficiency decreasing in broadened waveguide, we proposed the optimum dopant in n-section of waveguide without extra effective free carrier loss. CP - IRAN IN - LG - eng PB - opsi PG - 85 PT - Research YR - 2018