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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
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Development of long-period fiber grating coupling devices
Applied Optics, 2008A long-period fiber grating (LPFG) formed in a single-mode fiber is considered as an effective device to tap light from the core of fiber. This light-tapping property of the LPFG allows a new class of wavelength-selective optical couplers to be realized by using the configuration of parallel LPFGs. Over the years a number of four-port and six-port LPFG
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Bending sensitivity of in-series long-period fiber gratings
Optics Letters, 1998The interference fringes formed in a long-period fiber grating pair are sensitive to the loss in the cladding mode, which can be induced by bending or by coating on the fiber. Assuming that there is no loss and that both gratings are identical, the interference fringes are shown to have 100% contrast when each grating has 50% transmissivity.
B H, Lee, J, Nishii
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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
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Dispersion control with use of long-period fiber gratings
Journal of the Optical Society of America A, 2000Chirped long-period fiber gratings are analyzed for management of dispersion in optical fiber communications systems. A ray model is used to derive simple analytic expressions that describe the transmission, chromatic delay, and dispersion properties of chirped long-period fiber gratings. A numerical model based on coupled-mode theory is used to verify
D B, Stegall, T, Erdogan
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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 ...
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Long-period fiber-grating-based gain equalizers
Optics Letters, 1996Long-period fiber gratings are used to f latten the gain spectrum of erbium-doped fiber amplifiers. A broadband amplifier with
A M, Vengsarkar +5 more
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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
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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
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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
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