Novel method for characterisation of single-mode fibres and prediction of crossover wavelength and bandpass in nonidentical fibre directional couplers

1986 ◽  
Vol 22 (15) ◽  
pp. 792 ◽  
Author(s):  
R. Tewari ◽  
K. Thyagarajan ◽  
A.K. Ghatak
Keyword(s):  
Single Mode ◽  
Directional Couplers ◽  
Novel Method

Novel method for making single-mode optical fibre directional couplers

1982 ◽  
Vol 18 (13) ◽  
pp. 566 ◽  
Author(s):  
G. Schöner ◽  
E. Klement ◽  
G. Schiffner ◽  
N. Douklias
Keyword(s):  
Optical Fibre ◽  
Single Mode ◽  
Directional Couplers ◽  
Novel Method

scholarly journals Femtosecond Laser Written Depressed-Cladding Waveguide 2 × 2, 1 × 2 and 3 × 3 Directional Couplers in Tm3+:YAG Crystal

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Nikolay Skryabin ◽  
Alexander Kalinkin ◽  
Ivan Dyakonov ◽  
Sergei Kulik
Keyword(s):  
Femtosecond Laser ◽  
Single Mode ◽  
Integrated Photonics ◽  
Beam Splitting ◽  
Directional Couplers ◽  
Laser Writing

Ion-doped crystal-based compact devices capable of beam splitting and coupling are enthralling for a broad range of classical and quantum integrated photonics applications. In this work, we report on the fabrication of depressed-cladding waveguide 2D 2 × 2, 1 × 2 and 3D 3 × 3 directional couplers in Tm 3 + :YAG crystal by femtosecond laser writing. The performances of the couplers are characterized at 810 nm, showing single-mode guidance, polarization independence, finely matched splitting ratios. These results open up new opportunities in the beneficial fabrication of 3D circuits and devices in crystals.

Temporal Integration Can Readily Switch Between Sublinear and Supralinear Summation

1998 ◽  
Vol 79 (5) ◽  
pp. 2809-2813 ◽  
Author(s):  
Michael Margulis ◽  
Cha-Min Tang
Keyword(s):  
Optical Fibers ◽  
Hippocampal Neurons ◽  
Temporal Summation ◽  
Temporal Integration ◽  
Single Mode ◽  
Interpulse Interval ◽  
Cable Theory ◽  
Cable Properties ◽  
Novel Method ◽  
Acting In Concert

Margulis, Michael and Cha-Min Tang. Temporal integration can readily switch between sublinear and supralinear summation. J. Neurophysiol. 79: 2809–2813, 1998. Temporal summation at dendrites of cultured rat hippocampal neurons was examined as a function of the interval separating two dendritic inputs. A novel method that relies on single-mode optical fibers to achieve rapid photorelease of glutamate was developed. Dendritic excitation achieved with this approach resembles that associated with miniature excitatory postsynaptic currents (mEPSCs), but the strengths, sites, and timing of the inputs can be precisely controlled. Dendritic summation deviated markedly from behavior predicted by passive cable theory. Subthreshold temporal summation varied as a triphasic function of the interpulse interval. As the interpulse interval decreased, local dendritic Na+ conductances were recruited to generate a marked transition from sublinear to supralinear summation. These results suggest that active dendritic conductances acting in concert with passive cable properties may serve to boost coincident synaptic inputs and attenuate noncoincident inputs.

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