A simple method for prediction of far-field pattern of mono-mode graded index fibers in the low V region

In this work the influence of GaN substrate thickness on the near and far-field patternsof InGaN lasers structures is analyzed. In simulation a conventional separateconfinement heterostructure of InGaN-MQW / GaN / AlGaN is considered. Afluctuating behavior is found, showing that for some values of the substrate thicknessthe near and far- field patterns can be optimized and there are critical values of thesubstrate thickness that produce the lowest values of the confinement factor and thehigher values of the full wide half-maximum of the far field. It is also shown that bysubstituting the GaN contact layer by an AlxGa1-xN layer with a parabolic variation ofthe Al content it is possible to reduce the optical field leakage to substrate. Resultsindicated that properly choosing the thickness of the substrate and replacing the n-GaNcontact layer by a graded-index (GRIN) AlxGa1-xN layer it is possible to improve boththe confinement factor and Far field pattern in nitride lasers.

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Estimation of the modal field profile of single mode graded-index fibers from the far-field pattern

Optics Communications ◽

10.1016/0030-4018(82)90117-1 ◽

1982 ◽

Vol 44 (2) ◽

pp. 94-99 ◽

Cited By ~ 9

Author(s):

Ramanand Tewari ◽

K. Thyagarajan ◽

B.P. Pal ◽

A.K. Ghatak

Keyword(s):

Single Mode ◽

Field Pattern ◽

Far Field ◽

Field Profile ◽

Graded Index ◽

Modal Field ◽

Far Field Pattern

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Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers

Journal of Applied Physics ◽

10.1063/1.3043795 ◽

2008 ◽

Vol 104 (12) ◽

pp. 124513 ◽

Cited By ~ 14

Author(s):

P. Gellie ◽

W. Maineult ◽

A. Andronico ◽

G. Leo ◽

C. Sirtori ◽

...

Keyword(s):

Quantum Cascade Lasers ◽

Transverse Mode ◽

Field Pattern ◽

Far Field ◽

Mode Structure ◽

Quantum Cascade ◽

Metal Metal ◽

Far Field Pattern ◽

Cascade Lasers

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Far-field patterns of line sources mounted between four-dielectric substrates

Canadian Journal of Physics ◽

10.1139/p92-023 ◽

1992 ◽

Vol 70 (2-3) ◽

pp. 173-178 ◽

Cited By ~ 1

Author(s):

Ioanna Diamandi ◽

Costas Mertzianidis ◽

John N. Sahalos

Keyword(s):

Remote Sensing ◽

Line Source ◽

Dielectric Substrate ◽

Microstrip Antennas ◽

Field Pattern ◽

Substrate Thickness ◽

Far Field ◽

Dielectric Substrates ◽

Field Patterns ◽

Far Field Pattern

The far-field pattern characteristics of line sources lying between the slabs of a four-dielectric substrate configuration are presented. The patterns are calculated for several cases of the substrate thickness as well as for several line-source locations. The considerations that are made give useful applications in remote sensing and microstrip antennas.

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A Simple Method for Prediction of Effective Core Area and Index of Refraction of Single-mode Graded Index Fiber in the Low V Region

Journal of Optical Communications ◽

10.1515/joc-2014-0020 ◽

2014 ◽

Vol 35 (4) ◽

Author(s):

Angshuman Majumdar ◽

Satabdi Das ◽

Sankar Gangopadhyay

Keyword(s):

Refractive Index ◽

Single Mode ◽

Index Of Refraction ◽

Core Area ◽

Exact Results ◽

Simple Method ◽

Graded Index ◽

Core Areas ◽

V Region ◽

User Friendly

AbstractBased on the simple power series formulation of fundamental mode developed by Chebyshev formalism in the low V region, we prescribe analytical expression for effective core area of graded index fiber. Taking step and parabolic index fibers as examples, we estimate the effective core areas as well as effective refractive index for different normalized frequencies (V number) having low values. We also show that our estimations match excellently with the available exact results. The concerned predictions by our method require little computation. Thus, this simple but accurate formalism will be user friendly for the system engineers.

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