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We numerically investigate the effects of a minute femtosecond pulse seed on continuous wave pumped supercontinuum generation when the frequency shift of the seed varies.
In-fiber gratings provide a perfect platform for directly processing optical signals in optical fiber with ultra fast speed. Their spectral profile and dispersion profile can tailored to realise various functionalities in different applications. This paper will focus on the discussion of our past and recent development on fiber grating devices that are used for optical signal processing.
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...
For metro applications, direct detection offers the advantages of low cost and low complexity. Discrete multi-tone (DMT) is a promising format due to its high spectral efficiency, flexibility and tolerance to chromatic dispersion (CD). In this work, single-side-band-DMT (SSB-DMT) and tuneable electrical dispersion compensation double side-band-DMT (TEDC-DSB-DMT) are summarized and compared.
A holey fiber with round lattice is squeezed into a hotkey fiber with elliptical lattice and the results show that the squeezed fiber's birefringence is up to 10−2 in 1.5 ∼ 2.0μΜ wavelength range. Because of the 360 degree symmetry of the holey fiber with round lattice, it does not require deliberately to adjust the direction of extrusion when the fiber is squeezed. Thus the difficulty of fabricating...
A new method to modify excessively titled fiber gratings (Ex-TFGs) with 20 nm gold nanoparticles (GNPs) through 3-mercapt-otrimethoxysilane(MPTMS) was proposed. By monitoring the wavelength shift of Ex-TFGs for every modified step and using the scanning electron microscope (SEM), it proves that GN Ps are firmly combined on the surface of Ex-TFGs. Finally, by using different concentration of NaCl solutions...
We make some measurement research based on CW SPM method, and obtain the non-linear coefficient for the novel ultra low loss& large effective area single mode fiber. And we also discussed the measure uncertainty and non-linear coefficient influence factor.
Software Defined Satellite Networking (SDSN) provides an innovative perspective to manage satellite network through logically centralized network view and standard interfaces between the control and data plane. Significant advantages of SDSN include enabling integration of space and terrestrial network, flexible and efficient resource management, rapid and economical network function updating, etc...
We have demonstrated a passively Q-switched Erbium-doped fiber laser using PbS quantum dots polystyrene film (QDPF) as saturable absorbers (SAs). Compared with other SA materials, PbS QDPFs have advantages of broad absorption range, high quantum yield, and facile preparation. We have successfully generated stable Q-switched pulse with a repetition rate of 20.98 kHz. To our knowledge, this is the first...
In this paper, we reported a simple and compact all-fiber erbium-doped femtosecond laser mode-locked by fiber-taper molybdenum disulfide (MoS2) saturable absorber (SA). The SA was prepared by magnetron-sputtering deposition (MSD) method, directly growing MoS2 film and then gold film on the microfiber. Based on this SA, the oscillator operated in soliton state, and delivered 478 fs pulses with 6.2...
An Erbium-Ytterbium co-doped random fiber laser (EYRFL) operating at 1550 nm is demonstrated for the first time. The laser cavity consists of a 5-m-long Er/Yb co-doped fiber and a 2-km-long single-mode fiber that provides random distributed feedback. We experimentally achieve 2.14 W of 1550 nm random lasing at 9.62W of 976 nm LD pump power. The laser exhibits a linear output with the slope efficiency...
A 1310 nm InGaAlAs/InP V-cavity laser (VCL) is proposed and experimentally demonstrated. The laser is ultra-compact with a device size of only 520μm×300μm. Measurement result shows that 38×100GHz tuning range with above 30dB side-mode suppression ratio (SMSR) is achieved.
This paper presents an automatic optical non-contact measurement method to measure the groove depth, groove number and groove surface area ratio of grooved cigarette filter. After preprocessing of the image of grooved filter, Morphological open operation was used to eliminate false groove detection. Then the contours of outer boundary and grooves were found and the parameters of the filters were calculated...
Here we demonstrate, to the best of our knowledge, a tunable 1.5 μm narrow linewidth fiber ring laser using a temperature tuning π-phase shifted fiber Bragg grating (π-PSFBG) for the first time. The π-PSFBG is employed as both a narrow band filter and a wavelength tuning component by a thermo electric cooler (TEC). The tuning range of the laser is 1.29 nm with the precision of 14 pm/°C, and the maximum...
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.
In this study, we demonstrate In-line fiber Mach-Zenhder interferometer measuring for vibration in this device we using the hydrogen flame, this sample device can excited high order cladding mode then we used such interferometer to measure vibration.
We demonstrate a new fiber-optic current sensor based on graphene nanoelectromechanical systems (NEMS) with a graphene membrane covering the hole on a fiber tip and two gold electrodes on opposite sides of the tip. The suspended graphene membrane will deform due to thermal effect when electrical current flows through it. Then the strain in the graphene nanomechanical resonator will change and it leads...
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...
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