TONG Zheng-rong,YANG He,ZHANG Wei-hua.Tunable fiber laser based on a cascaded structure consisting of in-line MZI and traditional MZI[J].Optoelectronics Letters,2016,12(6):437-440 Tunable fiber laser based on a cascaded structure consisting of in-line MZI and traditional MZI Author Name Affiliation TONG Zheng-rong  Tianjin Key Laboratory of Film Electronic and Communication Devices, Tianjin University of Technology, Tianjin 300384, China  YANG He  Tianjin Key Laboratory of Film Electronic and Communication Devices, Tianjin University of Technology, Tianjin 300384, China  ZHANG Wei-hua  Tianjin Key Laboratory of Film Electronic and Communication Devices, Tianjin University of Technology, Tianjin 300384, China  Abstract:       A tunable erbium-doped fiber (EDF) laser with a cascaded structure consisting of in-line Mach-Zehnder interferometer (MZI) and traditional MZI is proposed. The transmission spectrum of the in-line MZI is modulated by the traditional MZI, which determines the period of the cascaded structure, while the in-line MZI’s transmission spectrum is the outer envelope curve of the cascaded structure’s transmission spectrum. A stable single-wavelength lasing operation is obtained at 1 527.14 nm. The linewidth is less than 0.07 nm with a side-mode suppression ratio (SMSR) over 48 dB. Fixing the in-line MZI structure on a furnace, when the temperature changes from 30 °C to 230 °C, the central wavelength can be tuned within the range of 12.4 nm. Hits: 3861 Download times: 0 View Full Text    Download reader