Results 31 to 40 of about 15,288 (305)

Ultra-Broadband, Fabrication Tolerant Optical Coupler for Arbitrary Splitting Ratio Using Particle Swarm Optimization Algorithm

IEEE Photonics Journal, 2020
This work presents a design approach of multi-segment directional couplers with ultra-broadband flat spectra and benign fabrication tolerance on the silicon nitride platform.
Lemeng Leng, Minfeng Jin, Zhongzhi Lin, Chenbin Zhang, Ding Ding, Wei Jiang   +5 more
doaj   +1 more source

Silica Waveguide Four-Mode Multiplexer Based on Cascaded Directional Couplers

Photonics, 2023
Mode multiplexers/demultiplexers (MUX/deMUX) are key components in mode division multiplexing. A silica waveguide mode MUX consisting of four cascaded directional couplers is experimentally demonstrated.
Manzhuo Wang, Xiaoqiang Sun, Tingyu Liu, Jianbo Yue, Chaoyang Sun, Dehui Li, Yuanda Wu, Daming Zhang   +7 more
doaj   +1 more source

Ultracompact, low-loss directional couplers on InP based on self-imaging by multimode interference [PDF]

, 1991
We report extremely compact (494-µm-long 3 dB splitters, including input/output bends), polarization-insensitive, zero-gap directional couplers on InP with a highly multimode interference region that are based on the self-imaging effect.
A. Scherer, E. C. M. Pennings, Haus H. A., Inoue H., L. B. Soldano, M. K. Smit, N. C. Andreadakis, Neumann E.-G., R. Bhat, R. J. Deri, R. J. Hawkins, Seto M., T. R. Hayes, Ulrich R., Zucker J. E.   +14 more
core   +2 more sources

High-Directivity and Low-Loss Directional Couplers Based on Empty Substrate Integrated Coaxial Line Technology

IEEE Access
High-directivity and low-loss directional couplers based on Empty Substrate Integrated Coaxial Line (ESICL) technology are presented in this article. The proposed coupled line directional couplers are based on the combination of a high-isolation section,
David Herraiz, Hector Esteban, Dario Herraiz, Juan J. De Dios, Marcos D. Fernandez, Angel Belenguer, Vicente E. Boria   +6 more
doaj   +1 more source

Design and Fabrication of Wideband Millimeter-Wave Directional Couplers With Different Coupling Factors Based on Gap Waveguide Technology

IEEE Access, 2019
A class of wideband directional couplers suitable for achieving different coupling levels are proposed in this paper. The proposed couplers have been implemented using the double-layer groove gap waveguide at the millimeter-wave frequency range. They are
Davoud Zarifi, Ali Farahbakhsh, Ashraf Uz Zaman   +2 more
doaj   +1 more source

Directional microwave coupled-line couplers with high lateral coupling level

Доклады Белорусского государственного университета информатики и радиоэлектроники, 2021
Classic сoupled-line couplers with a high lateral coupling level by type of directivity are counterdirectional. Restrictions on their synthesis are imposed by the gap between transmission lines, which must be extremely small (tens of microns), the ...
I. A. Fanyaev
doaj   +1 more source

Study of Directivity of The Microstripline Directional Coupler and Design the 6 Db Coupler

International Journal of Scientific Research in Science and Technology, 2023
In this paper, we present about the study of directivity of microstripline directional coupler and design the 6 dB coupler. The importance lies in the present study of light weight, small size and lower cost planer transmission structure like MIC’s of communications.
null Akansha Kumari, null Dr. K. B. Singh, null Dr. Pankaj Kumar   +2 more
openaire   +1 more source

Symmetric polarization insensitive directional couplers fabricated by femtosecond laser waveguide writing [PDF]

, 2018
We study analytically the polarization behaviour of directional couplers composed of birefringent waveguides, showing that they can induce polarization transformations that depend on the specific input-output path considered.
Atzeni, Simone, Corrielli, Giacomo, Crespi, Andrea, Osellame, Roberto, Piacentini, Simone, Pitsios, Ioannis   +5 more
core   +4 more sources

Nonlinear parity-time-symmetric transition in finite-size optical couplers

, 2015
Parity-time-symmetric ($\mathcal{PT}$-symmetric) optical waveguide couplers offer a great potential for future applications in integrated optics.
Litchinitser, Natalia M., Ma, Chicheng, Walasik, Wiktor   +2 more
core   +1 more source

AAA+ protein unfoldases—the Moirai of the proteome

FEBS Letters, EarlyView.
AAA+ unfoldases are essential molecular motors that power protein degradation and disaggregation. This review integrates recent cryo‐electron microscopy (cryo‐EM) structures and single‐molecule biophysical data to reconcile competing models of substrate translocation.
Stavros Azinas, Marta Carroni
wiley   +1 more source