Results 231 to 240 of about 4,245,502 (276)

Micro-bend-Resistant Low-Differential-Mode-Group-Delay Few-Mode Fibers

Journal of Lightwave Technology, 2017
We report the design of micro-bend-resistant low-differential-mode-group-delay (low-DMGD) few-mode fibers that support up to six mode groups (12 LP modes, 21 spatial modes) and that are adapted to multiple-input multiple-output mode-division-multiplexed transmissions. Compared to previous designs, the micro-bending sensitivity is reduced by more than a
José Enrique Antonio-López, Denis Molin, Frank Achten   +2 more
exaly   +3 more sources

Differential mode delay diagnostics for LP modes traversing a few-mode fiber

Applied Optics, 2021
We provide differential mode delay (DMD) diagnostics for linearly polarized (LP) modes traversing a few-mode fiber (FMF). We employ a modal interferometer method with a butt coupling mechanism to measure the DMD between any two modes guided in FMFs with step-index (SI) and depressed-cladding profiles. The measurement principle is based on investigating
Nori Shibata, Kimitaka Watanabe, Masaharu Ohashi, Yusuke Sasaki, Kazuhiko Aikawa   +4 more
openaire   +2 more sources

Influence of mode coupling on differential mode delay

Applied Optics, 1983
The manner in which the differential mode delay (DMD) pulse response is affected by ellipticity- and microbending-induced mode coupling has been analyzed numerically. We have considered both a fiber profile containing a central index dip and fiber profiles with sinusoidal ripples.
B, Stoltz, D, Yevick
openaire   +2 more sources

Low-Differential-Mode-Group-Delay 9-LP-Mode Fiber

Journal of Lightwave Technology, 2015
We report the optimization of a few-mode fiber, adapted to multiple-input multiple-output mode division multiplexing, that supports 9 LP modes (15 spatial modes). The fiber is fabricated using standard multimode processes, which allows for tight process tolerances, yielding low differential mode group delays (2) and low bend losses.
Sillard, P., Molin, D., Bigot-Astruc, M., de Jongh, K., Achten, F., Velázquez-Benítez, A.M., Amezcua-Correa, R., Okonkwo, C.   +7 more
openaire   +3 more sources

On the dependence of differential mode delay in few-mode fibers on the number of modes

2013 15th International Conference on Transparent Optical Networks (ICTON), 2013
This paper presents the design of few-mode fibers (FMFs) with low differential mode delay (DMD) over the C-band, considering a refractive index profile with a graded core and a cladding trench. By optimizing the core grading exponent and the dimensioning of the trench, the lowest DMD achievable is obtained for different numbers of linearly polarized ...
Filipe Ferreira, Daniel Fonseca, Henrique Silva   +2 more
openaire   +1 more source

Delay differential equations for passive mode locking

EQEC '05. European Quantum Electronics Conference, 2005., 2006
This study analyzes a model for passive mode locking in which the approximations of small gain and loss per cavity round trip and weak saturation are avoided. The model is thus capable of describing mode locking in the parameter range of semiconductor lasers.
M. Nizette, A.G. Vladimirov, D. Rachinskii, M. Wolfrum   +3 more
openaire   +1 more source

Measurement of differential mode group delay in few-mode fibers based on Fresnel reflection peaks

Applied Optics, 2023
Mode-division multiplexing communication based on few-mode fibers (FMFs) is the most competitive scheme to address the bandwidth exhaustion in single-mode fibers. The differential mode group delay (DMGD) among different modes in FMFs is an important aspect in characterizing FMFs, and the convenient, fast, and accurate measurement of DMGD in different ...
Aodi, Pang, Guijun, Hu, Yi, Qin, Haiyan, Wang   +3 more
openaire   +2 more sources

Adaptive MIMO equalization for few-mode fiber transmission with various differential mode delays

2015 European Conference on Optical Communication (ECOC), 2015
An adaptive MIMO equalization method is presented for few-mode fiber transmission where various differential mode delays (DMDs) simultaneously occur. Evaluation using experimental data shows its use of sparsity to promote equalization effectively deals with various DMDs to suppress the noise.
D. Lee, Kohki Shibahara, Takayuki Kobayashi, Takayuki Mizuno, Hidehiko Takara, Akihide Sano, Hiroto Kawakami, T. Nakagawa, Yutaka Miyamoto   +8 more
openaire   +1 more source

Demonstration of Mode Scramblers Supporting 6 Spatial Modes to Reduce Differential Group Delays

2017 European Conference on Optical Communication (ECOC), 2017
We demonstrate a mode scrambler for mixing 6 spatial modes. We present the characterization results of mode-dependent loss and modal transfer matrix using a swept-wavelength interferometer and verify group-delay spread reduction through principal mode analysis.
Haoshuo Chen, Nicolas K. Fontaine, Bin Huang, Roland Ryf, Ian Giles   +4 more
openaire   +1 more source

Sliding mode control of uncertain delay differential systems

Nonlinear Analysis: Theory, Methods & Applications, 1997
Sliding mode control for semilinear delay systems of the form \[ \begin{aligned} \dot x(t) & = A_0(t) x(t)+A_1(t) x\bigl(t- \tau(t) \bigr)+ b_0(t) u(t)+ f\biggl(t,x(t), x\bigl(t-\tau (t)\bigr) \biggr) \\ x(t) & = \varphi(t),\;t\in[-\overline \tau,0] \end{aligned} \] is considered, where \(A_0(t)\) and \(b_0(t)\) are in control canonical form.
Sinha, A. S. C., El-Sharkawy, M., Rizkalla, M.   +2 more
openaire   +2 more sources