Disorder-Delineated AlGaAs/GaAs Quantum-Well Phase Modulator

MRS Proceedings ◽

10.1557/proc-484-453 ◽

1997 ◽

Vol 484 ◽

Author(s):

Wallace C. H. Choy ◽

Bernard L. Weiss

Keyword(s):

Quantum Well ◽

Unit Length ◽

Active Regions ◽

Single Mode ◽

Phase Modulator ◽

Absorption Loss ◽

The Core ◽

Phase Modulators ◽

Refractive Index Difference ◽

Unit Voltage

AbstractModeling is used to investigate waveguide phase modulators, with 0.5 μm and 1 μm quantum well active regions which are defined by implantation induced disordering. By controlling the extent of the interdiffusion in the lateral claddings, the refractive index difference between the core and claddings is used to provide single mode operation. The performance of the phase modulator is studied in terms of optical confinement, phase change per unit voltage per unit length, chirping property and absorption loss. Our result shows that the 0.5 μm one is a more efficient structure and its absorption loss can be reduced by increasing the applied field from 50 kV/cm to 100 kV/cm.

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Phase Modulator Defined by Impurities Induced Disordering

MRS Proceedings ◽

10.1557/proc-450-383 ◽

1996 ◽

Vol 450 ◽

Author(s):

K. M. Lo ◽

W. C. H. Choy ◽

E. H. Li

Keyword(s):

Refractive Index ◽

Quantum Wells ◽

Single Mode ◽

Refractive Index Profile ◽

Phase Modulator ◽

Multiple Quantum ◽

Index Profile ◽

Phase Modulators ◽

Operating Region ◽

Waveguide Type

ABSTRACTOptical waveguide type phase modulators defined by impurities induced disordering (IID) are investigated. To achieve a better optical confinement, a two steps ion implantation process is carried out to introduce additional impurities with respect to depth in the cladding region. A more uniform refractive index profile in deeper lateral confined region is obtained after thermal annealing. The refractive index different between the core and cladding can be adjusted by controlling the extension of interdiffusion in the cladding. This provide tuning of single mode operating region. For present IID phase modulator with 25 period of 100Å/100Å Al0.3Ga0.7As/GaAs multiple quantum wells single mode operating at 0.88//m, a normalized phase shift of 362°/Vmm. chirping parameter of 47, and absorption loss less than 120cm−1 are achieved theoretically.

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Mode propagation and absorption loss of single-mode metal-clad multiple quantum-well optical waveguides

Optical Engineering ◽

10.1117/12.210765 ◽

1995 ◽

Vol 34 (10) ◽

pp. 3009 ◽

Cited By ~ 1

Author(s):

Chunsheng Ma

Keyword(s):

Quantum Well ◽

Optical Waveguides ◽

Multiple Quantum Well ◽

Single Mode ◽

Multiple Quantum ◽

Mode Propagation ◽

Absorption Loss

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Optimised multiple quantum well phase modulator

Electronics Letters ◽

10.1049/el:19890901 ◽

1989 ◽

Vol 25 (20) ◽

pp. 1349 ◽

Cited By ~ 7

Author(s):

P.J. Bradley ◽

G. Parry ◽

J.S. Roberts

Keyword(s):

Quantum Well ◽

Multiple Quantum Well ◽

Phase Modulator ◽

Multiple Quantum

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Static and dynamic response of sandwich beams with lattice and pantographic cores

Journal of Sandwich Structures & Materials ◽

10.1177/10996362211033896 ◽

2021 ◽

pp. 109963622110338

Author(s):

Yury Solyaev ◽

Arseniy Babaytsev ◽

Anastasia Ustenko ◽

Andrey Ripetskiy ◽

Alexander Volkov

Keyword(s):

Mechanical Performance ◽

Lattice Structure ◽

Unit Length ◽

Experimental Tests ◽

Plane Geometry ◽

Sandwich Beams ◽

Static Tests ◽

Three Point Bending ◽

The Core ◽

The Impact

Mechanical performance of 3d-printed polyamide sandwich beams with different type of the lattice cores is investigated. Four variants of the beams are considered, which differ in the type of connections between the elements in the lattice structure of the core. We consider the pantographic-type lattices formed by the two families of inclined beams placed with small offset and connected by stiff joints (variant 1), by hinges (variant 2) and made without joints (variant 3). The fourth type of the core has the standard plane geometry formed by the intersected beams lying in the same plane (variant 4). Experimental tests were performed for the localized indentation loading according to the three-point bending scheme with small span-to-thickness ratio. From the experiments we found that the plane geometry of variant 4 has the highest rigidity and the highest load bearing capacity in the static tests. However, other three variants of the pantographic-type cores (1–3) demonstrate the better performance under the impact loading. The impact strength of such structures are in 3.5–5 times higher than those one of variant 4 with almost the same mass per unit length. This result is validated by using numerical simulations and explained by the decrease of the stress concentration and the stress state triaxiality and also by the delocalization effects that arise in the pantographic-type cores.

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