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In this paper· we demonstrate a Yb-doped· all-polarization-maintained· dumbbell-shaped fiber laser operating in dissipative soliton resonance regime. A nonreciprocal phase shifter is introduced to a reflective nonlinear optical loop mirror to reduce the self-starting threshold. The duration of the square pulses generated can be adjusted from 207ps to 20.6 ns by increasing pump power. Up to 512 nJ...
In this paper, all-fiber based all polarization maintaining erbium-doped fiber lasers based on nonlinear amplifying loop mirror (NALM), including both figure-of-8 and figure-of-9 configurations are demonstrated. The figure-of-8 oscillator generates 1.6 ps chirped pulses at 1550 nm with a pulse energy of 0.8 nJ and a repetition rate of 12 MHz. The figure-of-9 oscillator generates 420 fs pulses at 1550...
We demonstrated experimentally a stable 1μm multi-wavelength YDF based random fiber laser by using a polarization independent Sagnac-loop mirror with output power of 1.6W and high OSNR of 30dB.
A helical long-period grating (HLPG) was written in a polarization maintaining fiber (PMF) with CO2 laser. The twist characteristics of individual and cascaded PMF-HLPG were investigated experimentally. It was found that PMF-HLPG behaved differently with a different light input. When a polarized light was launched into the cascaded PMF-HLPGs with opposite helical direction, a high twist sensitivity...
We demonstrated a new and simple method to implement an all fiber, wavelength switchable, free spectral range (FSR) accurately controlled single-pass Mach-Zehnder interferometer (MZI) comb filter, which consists of a polarization controller (PC) and a segment of tapered fiber in one arm. Through rotating the PC, the wavelength switchable operation was obtained. Using fused taper technology to draw...
We demonstrate simultaneous spatial and arbitrary temporal pulse-shaping with a picosecond Yb-doped fiber laser system generating an output power > 10 W. By using a self-developed feed-back control algorithm on a single polarization optical pulse shaper, we obtained arbitrary complex pulse structures in the time domain with high accuracy and at high power level. Meanwhile, the pulse shaping in...
We report an actively Q-switched fiber laser with cylindrical vector beam emission using a few-mode fiber Bragg grating as mode selection and acousto-optic modulator to achieve the ideal ns pulse. Both radially and azimuthally polarized beams have been obtained by tuning the polarization controllers. The generated Q-switched CVB operates at central wavelength of 1055.6 nm with a spectrum bandwidth...
We demonstrate a dispersion managed Erbium doped all-fiber laser with 101.75MHz repetition rate using 45°TFG to realize mode locking based on nonlinear polarization rotation technique. In our experiment, stable dual-pulse tightly bound states were observed under the pump power of505mW.
By using a white light interferometer to monitor the angular misalignment at a splicing point between a polarization-maintaining fiber and a single-polarization fiber, a low loss hybrid single-polarization fiber ring resonator with a round-trip loss of 0.98dB is fabricated. The misaligned angle at each splicing point is reduced from 10°to 1°, and the average splice loss is reduced by approximately...
A novel high SMSR dual-wavelength erbium-doped fiber laser operating in C-band is proposed and successfully demonstrated. Based on Arrayed-Waveguide Gratings (A WGs) as a comber filter and demultiplexer, the fiber laser retrieve the optical side-mode suppression ratio (SMSR) of 53dB and the output powers of-10.45dBm and-10.20dBm at the wavelengths 1554.87nm and 1555.65nm, respectively. The mode spacing...
We experimentally demonstrate a new method for modulating the light polarization state of the fiber. Both of the light polarization degree and polarization direction can be modulated. In the experiment, microfiber is immersed into the magnetic fluid (MF). When there is external magnetic field, magnetic nanoparticles of the MF generate magneto-optical dichroism and a non-circular symmetric distribution...
A novel humidity sensor, which is based on Michelson interferometer (MI) with thin core fiber (TCF) coated with chitosanis proposed and experimentally demonstrated. Its principle is that the light in the single-mode fiber (SMF) core is excited into the cladding of the TCF, and the light transmitted from the end face of the TCF is reflected back to the SMF core. When the chitosan is coated on the end...
A wavelength-tunable Erbium-doped fiber laser with birefringence-enhanced cavity is proposed. A 45° tiled fiber grating (45°TFG) and a section of polarization maintaining (PM) fiber are placed between two two polarization controllers (PCs). Two PCs and PM fiber are employed to enhance the birefringence effect. The 45° TFG plays the role of an in-fiber polarizer. The fiber laser is mode-locked by single...
We report on the generation of versatile pulse patterns in an erbium-doped fiber laser incorporating a 2D nano-materials, topological insulator (TI): Bi2Te3. By depositing of the TI on a microfier, an effctive saturable absorber (SA) would be created, which has combined the advantages from the strong nonlinear optical response in TI material together with the suffiently-long-range interaction length...
We experimentally observed the coexistence of polarization domains and polarization locked vector solitons in an Er-doped fiber laser with microfiber-based graphene as a saturable absorber. Taking advantage of the highly nonlinear effect and saturable absorption effect of the microfiber-based graphene saturable absorber, we have obtained polarization domains and their splitting into regularly or irregularly...
Unlike traditional fiber laser with defined resonant cavity, random fiber laser (RFL), whose operation is based on distributed gain and feedback via Rayleigh scattering and stimulated Raman scattering in long passive fiber, has fundamental scientific challenges in pulsing operation for its remarkable cavity-free feature. Here, we propose and experimentally realize the passively spatiotemporal gain...
We demonstrate that a low repetition rate, all-fiber passively mode-locked Yb-doped fiber laser through nonlinear polarization rotation (NPR). A 1000 m long single-mode fiber (SMF) is inserted into the cavity to lower the repetition rate. The laser operates in dissipative soliton resonance (DSR) region and generates stable square pulses with a 202.3 kHz fundamental repetition rate. When the pump power...
In this paper, we demonstrate a 2μm switchable single-longitudinal-mode dual-wavelength fiber laser based on composite cavity and a core-offset structure. The fiber laser is switchable, power-equalized and operating in single-longitudinal-mode.
A terahertz (THz) polarization splitter based on asymmetric dual slotted core polymer fiber is proposed and numerically investigated. The dual slotted core composed of subwavelength-scale air slots that are independently suspended within the fiber, not only allows for single-mode propagation for the two orthogonal polarization modes with low absorption losses, but also enables them to couple with...
A 16-mode PANDA polarization-maintaining ring-core fiber (PM-RCF) is presented and optimized, which adjacent LP-modes show effective refractive index differences larger than 10−4 for multiple-input multiple-output-free (MIMO-free) space-division multiplexing (SDM) optical networks. Relative mode multiplicity factor (RMMF) is defined to evaluate the spatial efficiency of the presented PM-RCF.
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