All-fiber normal-dispersion single-polarization passively mode-locked laser based on a 45°-tilted fiber grating

Abstract

An all-fiber normal-dispersion Yb-doped fiber laser with 45°-tilted fiber grating (TFG) is, to the best of our knowledge, experimentally demonstrated for the first time. Stable linearly-chirped pulses with the duration of 4 ps and the bandwidth of 9 nm can be directly generated from the laser cavity. By employing the 45° TFG with the polarization-dependent loss of 33 dB, output pulses with high polarization extinction ratio of 26 dB are implemented in the experiment. Our result shows that the 45° TFG can work effectively as a polarizer, which could be exploited to singlepolarization all-fiber lasers. Pivtsov, "Gamma-shaped long-cavity normal-dispersion mode-locked Er-fiber laser for sub-nanosecond highenergy pulsed generation," Laser Phys. Lett. 9(1), 59-67 (2012). "Measuring ultrashort laser pulses in the time-frequency domain using frequency-resolved optical gating," Rev. ©2012 Optical Society of America

Mode-Locked Erbium-Doped Fiber Lasers Using 45° Tilted Fiber Grating

“…As one may be aware that the strong PDL and low IL could further extend to wavelength region less than 1530 nm. This is indeed expected based on the previous theoretical study [33]. In this paper, we will focus on the polarization properties of 45TFG around 1550nm region.…”

“…Demonstrations of applications of 45TFG in ultrashort pulse generation in other wavelengths have also been successful [33], [38]. We believe the 45TFG could be an effective all-fiber polarizing device for more versatile mode locked fiber laser systems across a broad wavelength range.…”

Effect of narrow spectral filter position on the characteristics of active similariton mode-locked femtosecond fiber laser

“…Spectral filtering of the chirped pulse in the frequency domain is mapped into temporal cutting of the pulse edges [14]. The bandwidth of the SF and the nonlinear transmission of the saturable absorber have a major effect on the temporal and spectral profiles of the pulse in the dissipative soliton regime [8,[15][16][17][18]. In addition to pulse stabilization, the SF assists the generation of a parabolic pulse in the active similariton laser by reducing the temporal width of the pulse entering the Yb 3+ -fiber.…”

Wavelength-tunable passively mode-locked Erbium-doped fiber laser based on carbon nanotube and a 45° tilted fiber grating

“…The 45º tilted fiber grating (45TFG) inscribed in a standard single mode fiber (SMF) features huge s-light loss and negligible p-light loss is an ideal polarizing device to achieve intracavity birefringence filter. With the advantages of all-fiber structure, low fabrication cost, strong polarization dependent loss (PDL) and low insertion loss, 45TFG have been already applied in many fields such as spectrometer [35], in-fiber Lyot filter [36], single polarization fiber laser [37], mode locked fiber laser [38][39][40].…”