Erbium doped fiber lasers based on 45° tilted fiber gratings

Abstract

45° tilted fiber grating (TFG) possesses a series of merits, such as strong polarization dependant loss (PDL), low insertion loss, superior compatibility, and compactness. One of the most prominent features of such polarizing device is the all-fiber structure. This polarizing element plays an important role in all-fiber integrated systems which have been widely investigated in the last two decades. In this report, we reviewed the recent development in single wavelength, multiple wavelength, Q-switched, and mode locked fiber lasers based on the 45°TFG as in-fiber polarizer.

62 nm CW wavelength-selectable erbium-doped fiber compound-ring laser with stable single-mode output

“…In order to obtain widely wavelength-tuning range of EDF-based laser, utilizing parallel EDFA structure with various operated bands [8], hybrid semiconductor optical amplifier (SAO) and EDFA [9], and high concentration EDF [10] have been investigated. The output wavelength of EDF laser could be tuned easily by utilizing the tunable optical filter inside the laser cavity, such as the fiber Fabry-Perot tunable filter, optical tunable bandpass filter (OTBF), and variable fiber Bragg grating [11][12][13]. Moreover, several technologies have been studied to reach SLM oscillation of EDF laser, such as using EDF-based saturable absorber, employing multiple-fiber-ring configuration, applying Mach-Zehnder Interferometer, and utilizing tunable FBG Fabry-Perot etalon [3,[14][15][16][17].…”