RT Journal T1 Gain properties and optical-feedback suppression of asymmetrical curved active waveguides A1 Zigang DUAN, Wei SHI, Yan LI, Guangyue CHAI PB Front. Optoelectron. FD 2009-12-05 YR 2009 JF Frontiers of Optoelectronics JO Front. Optoelectron. VO 2 IS 4 SP 379 DO 10.1007/s12200-009-0065-1 K1 curved active waveguide;feedback restrain;semiconductor optical amplifier (SOA) LK {https://journal.hep.com.cn/foe/EN/article/article_893.shtml}