Title :
Polarization-Independent All-Fiber Quasi-Flat-Top Comb Filter Based on a Dual-Pass Mach–Zehnder Interferometer With High Birefringence Fiber in the Second Loop
Author :
Meng, Hongyun ; Wu, Xiaowei ; Shen, Wei ; Huang, Xuguang
Author_Institution :
Key Lab. of Photonic Inf. Technol. of Guangdong Higher Educ. Inst., South China Normal Univ., Guangzhou, China
Abstract :
A polarization-independent all-fiber comb filter with quasi-flat-top spectral response based on a dual-pass Mach-Zehnder (M-Z) interferometer is proposed and demonstrated. The proposed filter consists of a dual-pass M-Z interferometer with a section of high birefringence fiber (HBF) and a polarization controller (PC) in the second loop. The theoretical analysis shows that the apparatus allows to operate as a polarization-independent multiwavelength periodic filter and to gain the quasi-flat-top passband filter by adjusting the polarization state of the PC. Theoretical prediction was verified by experimental demonstration.
Keywords :
Mach-Zehnder interferometers; band-pass filters; birefringence; comb filters; optical control; optical fibre filters; optical fibre polarisation; dual-pass Mach-Zehnder interferometer; high birefringence fiber; multiwavelength periodic filter; polarization controller; polarization-independent all-fiber quasiflat-top comb filter; quasiflat-top passband filter; quasiflat-top spectral response; Optical fiber communication; Optical fiber couplers; Optical fiber filters; Optical fiber polarization; Optimized production technology; Sagnac interferometers; Birefringence; Mach–Zehnder (M-Z) interferometer; comb filter; flat-top;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2175214
