Results 251 to 260 of about 38,360 (284)
Some of the next articles are maybe not open access.
Long-period fiber gratings based on periodic microbends
Optics Letters, 1999We demonstrate a new type of high-performance long-period fiber grating based on arc-induced periodic microbends. The fabrication method is simple and does not require special fibers. Flexibility in controlling the filter parameters makes it possible to produce arbitrary filter profiles by use of a simple apodization technique, which is difficult to do
Hwang, IK +2 more
openaire +2 more sources
Long-period fiber gratings as ultrafast optical differentiators
Optics Letters, 2005It is demonstrated that a single, uniform long-period fiber grating (LPFG) working in the linear regime inherently behaves as an ultrafast optical temporal differentiator. Specifically, we show that the output temporal waveform in the core mode of a LPFG providing full energy coupling into the cladding mode is proportional to the first derivative of ...
Mykola, Kulishov, José, Azaña
openaire +2 more sources
3D printed long period gratings for optical fibers
Optics Letters, 2016We demonstrate a simple technique for implementing long period grating (LPG) structures by the use of a 3D printer. This Letter shows a way of manipulating the mode coupling within an optical fiber by applying stress through an external 3D printed periodic structure.
Victor Lambin, Iezzi +3 more
openaire +3 more sources
Femtosecond-written long-period gratings in fluoride fibers
Optics Letters, 2018Long-period gratings induced in fluoride glass fibers using femtosecond laser pulses at 800 nm are, to the best of our knowledge, demonstrated for the first time. By means of tightly confined ultrashort laser pulses, smooth periodic lines of refractive index changes are induced along the fiber core.
Maximilian, Heck +4 more
openaire +2 more sources
Structural long-period gratings in photonic crystal fibers
Optics Letters, 2002We report what is believed to be the first example of structural long-period gratings written in pure silica photonic crystal fibers (PCFs). The gratings are realized by periodic collapse of the holes of the PCF by heat treatment with a CO(2) laser. The resulting periodic hole-size perturbation produces core-to-cladding-mode conversion.
G, Kakarantzas +2 more
openaire +2 more sources
Progress in long period fiber gratings
Conference Proceedings. LEOS'98. 11th Annual Meeting. IEEE Lasers and Electro-Optics Society 1998 Annual Meeting (Cat. No.98CH36243), 2002Summary form only given. Long period fiber gratings have been used in a variety of applications such as gain equalization filters for optical amplifiers, band rejection filters and sensors for temperature and strain. Among these applications, gain equalization is the most demanding and interesting because of the impact of broadband gain-flattened EDFA ...
openaire +1 more source
Dipole effect in long-period fiber grating
Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 2001An effect of dipole by the UV-induced birefringence was analyzed using a long-period fiber grating. It was approximately 5.6% in UV-induced refractive index change due to the photosensitivity of Ge-related glass defects in our experiment.
M. Shigehara +3 more
openaire +1 more source
Asymmetric microhole-structured long-period fiber gratings
Sensors and Actuators B: Chemical, 2011Abstract Asymmetric microhole-structured long period fiber grating fabricated in single mode, fiber and photonics crystal fiber by use of femtosecond laser pulse drilling is, presented. The periodically structured microholes positioned a few microns away, from the central fiber axis can effectively couple the fundamental core mode into the, forward ...
Ying Wang +3 more
openaire +1 more source
Novel tunable long-period fiber grating filters
SPIE Proceedings, 2004A novel method to mechanically induce a long-period fiber grating (LPFG) by a grooved plate is reported. The transmission spectra of this kind of grating under different pressures and some special LPFG’s are experimentally investigated. This method is simple and reconfigurable and offers large spectra tunability.
Kai Chen +4 more
openaire +1 more source
Hermetic sealing of long period fiber gratings
Proceedings of SPIE, 2006A method of writing long period grating and a model to explain light coupling between fundamental mode and cladding mode are presented. One athermal hermetic sealing approach is proposed to form hermetic sealing long period fiber grating. A long period fiber grating was designed and written for this experiment.
Chengxin Yang, Baoping Guo, Jin-Hua Kim
openaire +1 more source