Narrowband directional couplers made of dissimilar single-mode fibers with different cladding refractive indices

1990 ◽  
Author(s):  
OTTOKAR LEMINGER ◽  
REMIGIUS ZENGERLE
Keyword(s):  
Single Mode ◽  
Refractive Indices ◽  
Directional Couplers

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.

BISTABLE TRANSMITTING NONLINEAR DIRECTIONAL COUPLERS

2006 ◽  
Vol 20 (10) ◽  
pp. 515-532 ◽  
Author(s):  
D. CHEVRIAUX ◽  
R. KHOMERIKI ◽  
J. LEON
Keyword(s):  
Schrodinger Equation ◽  
Light Propagation ◽  
Finite Interval ◽  
Boundary Value ◽  
Slab Waveguide ◽  
Refractive Indices ◽  
Weak Signal ◽  
Directional Couplers ◽  
Kerr Media ◽  
Propagation Properties

Nonlinearity induced by intensity-dependent refractive indices (Kerr media) can be used as a means to conceive light detectors sensitive to very weak excitation. This property results from the bistability properties of the nonlinear Schrödinger equation submitted to boundary value data on the finite interval. The detector is obtained by coupling two single 1D waveguide to a 2D slab waveguide with adjusted indices. The resulting device then presents unusual light propagation properties and in particular may switch from almost vanishing to intense output under excitation by a weak signal.

Sensing Refractive Indices of Fluids by Wavelength-Tunable Laser and Novel Multi-stage Directional Couplers

2017 ◽  
Vol 38 (2) ◽  
Author(s):  
Ruei-Chang Lu ◽  
Keh-Yi Lee
Keyword(s):  
Refractive Index ◽  
Optical Power ◽  
Tunable Laser ◽  
Liquid Solution ◽  
Refractive Indices ◽  
Directional Couplers ◽  
Wavelength Tunable ◽  
Multi Stage ◽  
Maximal Output ◽  
The Relationship

AbstractIn this work, the authors propose a modified type of multi-stage directional couplers and combine it with a wavelength-tunable laser to measure the refractive index of an undetermined biochemical liquid/solution. Tuning the wavelength of the laser incident on the modified multi-stage directional couplers, the relationship between the wavelength corresponding to the maximal output optical power and the refractive index of the unknown fluid has been obtained.

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