The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A design of mine wind velocity sensor is reported, which is based on differential pressure principle and adopts differential sensitive architecture composed of a bellows, an equal-strength beam and two fiber Bragg gratings(FBG). Furthermore, an algorithm is introduced for temperature compensation. Through these methods the cross sensitivity of temperature is effectively eliminated. The relation between...
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.
A random phase-shifted fiber Bragg grating has been theoretically analysed by the transfer matrix method. Numerical predictions of the effects of phase-shifted points on the reflection spectra of such a grating are calculated. This fiber Bragg grating with 10 random phase-shifted points distributed has been fabricated. These predictions are compared with experimentally measured spectra of the random...
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...
A simple and compact all-fiber sensor based on a sandwich fiber structure for simultaneous measurement of refractive index and temperature is proposed and demonstrated. The sensing element was made by cascading two core-offset attenuators with a fiber Bragg grating (FBG) in between. The two core-offset attenuators make up a Mach-Zehnder interferometer. The transmission spectrum would shift with the...
We propose a multiplexed fiber-optic methane sensor system to monitor the concentration of methane, which is realized by setting auxiliary weak fiber Bragg gratings (FBGs) around gas cells, and using an optical time domain reflectometry (OTDR) to measure the reflectivity. With the assistance of the weak FBGs, the methane concentration variations were successfully monitored with a detection sensitivity...
The effect of gamma radiation with a maximum dose of 180 kGy at a dose rate of 10.15 kGy/hour on both standard Ge-doped fiber Bragg Gratings (Ge-FBG) and femtosecond-laser-inscribed pure-silica-core fiber Bragg Gratings (FL-PS-FBG) have been investigated. In the case of Ge-FBGs, a maximum Bragg wavelength shifts (BWS) of 140 pm and a decrease of the reflection peak power of 16 dB has been observed...
A dual-passband microwave photonics filter (MPF) for fiber axial measurement is proposed and experimentally demonstrated. The MPF is mainly implemented using a phase modulator (PM) and two cascaded fiber Bragg grating Fabry-Perot (FBG-FP) filters with different central wavelengths. According to the phase-modulation to intensity-modulation (PM-IM) conversion in the MPF, dual-passband can be generated...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.