Radio over Fiber (RoF) is a promising technology for short range transmission applications within multimode optical fiber. Typically, the RoF link employs a single mode fiber. But the signal power at the remote antenna become small due to the power loss in the electrical to optical and optical to electrical conversion process. Coupling efficiency of an electrical to optical converter can be imp...

Abstract Fiber Bragg grating (FBG) array is a powerful technique for quasi-distributed sensing along the entire length of fiber with fast response and high precision. It has been widely used temperature, strain, vibration monitoring. In this review work, an overview on recent advances FBG arrays conducted. Firstly, fabrication methods are reviewed, which include femtosecond laser system online ...

This paper proposes an approach based on an optical imaging technique for the period measurement of fiber Bragg gratings (FBG). The simple, direct technique involves a differential interface contrast (DIC) microscope and a high-resolution CCD camera. Image processing is performed on the microscope images to obtain low-noise grating profiles and then the grating periods. Adopting a large image s...

<span>This article clarified the basic fiber Bragg grating (FBG) apodization functions effects on filtered optical acoustic signal (AS). Max power variations after acousto optic filter is with spectral wavelength variations. FBG are uniform, Gaussian, and Tanh. We have tested max various The AS amplitude electrical combiner reported based Apodization functions. studied lengths for at cent...

We have developed a linearly-polarized Ytterbium-doped fiber ring laser with single longitudinal-mode output at 1064nm for LISA and other space applications. Single longitudinalmode selection was achieved by using a fiber Bragg grating (FBG) and a fiber Fabry-Perot (FFP). The FFP also serves as a frequency-reference within our ring laser. Our laser exhibits comparable low frequency and intensit...

A novel type of fiber for sensing applications is introduced based on a plurality of individual fiber preforms drawn together but maintaining their original shape. The individual cores of the Gemini fiber can be addressed at input and output ends through splicing to stand-alone fibers. Thermal coupling between cores is sufficient to eliminate relative thermal effects. Fabrication, coupling and ...

The apodization function has a significant impact on the state of art group delay, dispersion compensation, and acceptable decrease in side lobes spectrum Fiber Bragg Grating (FBG) reflection. Accordingly, grating length would be considered backbone parameter order to achieve distinguishable performance. Here, utilization influence presence FBG is compensator. In addition, we have implemented t...

We propose and experimentally prove a novel design for implementing photonic temporal integrators simultaneously offering a high processing bandwidth and a long operation time window, namely a large time-bandwidth product. The proposed scheme is based on concatenating in series a time-limited ultrafast photonic temporal integrator, e.g. implemented using a fiber Bragg grating (FBG), with a disc...

In order to reduce the pumping threshold and achieve a short-cavity single-mode transmission with narrow-linewidth random fiber laser, we propose tunable laser based on combination of grating highly reflective Bragg (FBG). Theoretical modeling refractive index-modulated was carried out. Random is regarded as linear uniform gratings different periods. Simulation calculations were performed using...

An acoustic transducer based on a fiber Bragg grating (FBG) is presented and characterized for use in time-resolved laser-induced photoacoustic spectroscopy (PAS) on solid samples. The photoacoustic wave was generated by pulsed laser excitation of immobilized carbon black or erbium oxide powder, and detected by recording either the transmission or reflection spectrum of a clamped fiber Bragg gr...