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In this paper, we demonstrated a passively mode-locked erbium-doped fiber laser by incorporating a microfiber-based tungsten diselenide (WSe2) saturable absorber (SA). We obtained stable mode-locking with pulse duration of 1.2 ps, repetition rate of 2.6 MHz and signal-to-noise ratio (SNR) of 66 dB at maximum pump power of 400 mW. The experimental results show that CVD-grown WSe2 film can serve as...
The Optical transmission characteristics of microfiber coupler in micron dimension were analyzed. The optical field distribution between two fibers was gotten by numerical simulation with beam propagation method, and then the variation of the output light power of the coupler with different length is obtained. Based on the experimental platform for the production of microfiber coupler, the energy...
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...
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...
We demonstrate the fabrication of long-period fiber gratings written in six-mode fiber by CO2-laser pulses as a mode converter to realize the mode conversion from LP01 mode to LP11 mode, LP21 mode and LP02 mode successfully with efficiencies of more than 90%, respectively.
In this paper we propose and demonstrate a novel all-fiber fused-type mode selective coupler (MSC) that capable of converting LP01 mode to LP11 mode with high efficiency and purity. Unlike other coupler fabrication techniques for which single mode fiber (or few mode fiber) must be pre-tapered, the advantage of our proposed coupler is that pre-tapering is not required. Two different fibers of the MSC...
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...
We demonstrate a simple all-fiber erbium-doped CPA system with a large mode area fiber compressor, delivering 177 fs pulse with ∼16.5 nJ energy at 39.5 MHz pulse repetition rate.
A sensitivity-enhanced temperature sensor based on Vernier-effect was demonstrated. Vernier-effect is achieved by a cascaded configuration with a fiber Sagnac interferometer (FSI) and a Fabry-Perot interferometer (FPI). FSI, which consists of a certain length of polarization maintaining fiber, is for temperature sensing, while. FPI acts as a filter due the temperature insensitivity. Experimental results...
We make a theoretical demonstration of the transformation from the dissipative soliton to amplifier similariton in an all-normal dispersion fiber laser for the first time. An intermediate state between the dissipative soliton and amplifier similariton is proposed and we call it the “Dissipative similariton” considering its shaping mechanism and characteristics. Pulse regimes dynamics is thoroughly...
A brand new design of slot waveguide is proposed using a subwavelength hollow-core fiber, which enables light to be confined in an extremely small hollow-core with long interaction length. The slot-waveguide fibers (SWFs) have specific advantages in ultra-low volume optofluidic sensing compared with other waveguide structures. The guiding properties and optimization of the design to maximize its sensitive...
We demonstrate a passive harmonic mode-locked erbium-doped fiber laser with long cavity based on nonlinear polarization rotation (NPR). The total cavity length is 696 m, which can be achieved by incorporating a 650 m long single mode fiber (SMF). The fiber laser produces 6.1 ps, 6.49 nJ mode-locked pulse at a fundamental repetition rate of 306.4 kHz. And from 2th to 16th order passive harmonic mode-locked...
We propose and demonstrate an all-fiber passively mode-locked laser with pulsed cylindrical vector beam output based on a mode selective coupler (MSC) in a figure-8 cavity, The MSC made of a two mode fiber and a standard single mode fiber is used as both the intracavity transverse mode converter and mode splitter. Through adjusting the polarization state in the laser cavity, both radially and azimuthally...
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