scholarly journals Design of a Four-Branch Optical Power Splitter Based on Gallium-Nitride Using Rectangular Waveguide Coupling for Telecommunication Links

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Retno W. Purnamaningsih ◽  
Nji R. Poespawati ◽  
Elhadj Dogheche
Keyword(s):  
Gallium Nitride ◽  
Power Distribution ◽  
Optical Power ◽  
Power Input ◽  
Input Power ◽  
Propagation Length ◽  
Power Splitter ◽  
Excess Loss ◽  
Total Input ◽  
Rectangular Waveguides

This paper reports design of a simple four-branch optical power splitter using five parallel rectangular waveguides coupling in a gallium-nitride (GaN) semiconductor/sapphire for telecommunication links. The optimisation was conducted using the 3D FD-BPM method for long wavelength optical communication. The result shows that, at propagation length of 925 μm, the optical power input was successfully split into four uniform output beams, each with 24% of total input power. It is also shown that the relative output power distribution is almost stable through the C-band range. At the operating wavelength of 1.55 μm, the proposed power splitter has an excess loss lower than 0.2 dB. This study demonstrates the opportunity to develop optical interconnections from UV-Visible to near IR wavelengths.

scholarly journals An Optical Power Divider Based on Mode Coupling Using GaN/Al2O3 for Underwater Communication †

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 63 ◽  
Author(s):  
Retno Wigajatri Purnamaningsih ◽  
Nji Raden Poespawati ◽  
Tomy Abuzairi ◽  
Elhadj Dogheche
Keyword(s):  
Mode Coupling ◽  
Beam Propagation Method ◽  
Optical Power ◽  
Optical Signal ◽  
Power Divider ◽  
Underwater Communication ◽  
Propagation Length ◽  
Excess Loss ◽  
Rectangular Waveguides ◽  
Coupling Phenomena

This paper details the design of a 1 × 8 optical power divider, using a gallium nitride (GaN) semiconductor on sapphire, which can be applied to underwater optical wireless communication. The design consists of nine parallel rectangular waveguides which are based on mode coupling phenomena. Analysis of the design was performed using the beam propagation method (BPM). The optimization was conducted using the 3D finite difference (FD)-BPM method with an optical signal input at the wavelength required for maritime application of λ = 0.45 µm. The signal was injected into the central waveguide. The results showed that at a propagation length of 1480 µm the optical power is divided into eight output beams with an excess loss of 0.46 dB and imbalance of 0.51 dB. The proposed design can be further developed and applied in future underwater communication technology.

scholarly journals Integrated grating coupler/power splitter for on-chip optical power distribution

2014 ◽  
Author(s):  
Thijs Spuesens ◽  
Shibnath Pathak ◽  
Michael Vanslembrouck ◽  
Pieter Dumon ◽  
Wim Bogaerts
Keyword(s):  
Power Distribution ◽  
Optical Power ◽  
Grating Coupler ◽  
Power Splitter ◽  
On Chip

Proposal for high efficiently 1×4 power splitter based on photonic crystal waveguides

2015 ◽  
Vol 29 (15) ◽  
pp. 1550073 ◽  
Author(s):  
Hong Wang ◽  
Lingjuan He
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Photonic Integrated Circuits ◽  
Optical Power ◽  
Input Power ◽  
Photonic Crystal Waveguides ◽  
Defect Region ◽  
Power Splitter ◽  
Practical Applications ◽  
Total Transmittance

We proposed a new kind of 1×4 optical power splitter composed of one input photonic crystal (PC) waveguide (PCW) and two PC branches with a triangular lattice of air holes. By employing the coupling between a defect region and one input, four output PCWs, the input power can be efficiently split into four output ports. The total transmittance as high as 99.4% at the wavelength 1550 nm is achieved. By modifying two holes at junction area, the input power can be almost evenly split into four parts with a bandwidth larger than 80 nm. It provides a new method and a compact model to split input power into multiple output ports in PCW devices and may find practical applications in future photonic integrated circuits.

SEARCH FOR THE PROPOSED COLD FUSION OF D IN Pd

1989 ◽  
Vol 03 (10) ◽  
pp. 753-760
Author(s):  
C.W. CHU ◽  
Y.Y. XUE ◽  
R.L. MENG ◽  
P.H. HOR ◽  
Z.J. HUANG ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Cold Fusion ◽  
Power Input ◽  
Input Power ◽  
Electrolysis Time ◽  
Excess Heat ◽  
Electrolytic Cells ◽  
Electrolytic Process ◽  
Negative Results ◽  
Total Input

A direct, systematic, and well-controlled investigation of D2O-Pd electrolytic cells reveals neither neutrons at a rate exceeding 103 s −1 nor excess heat greater than 3% of the total input power generated during the electrolytic process in contrast to the cold fusion recently reported. No difference in the thermal energy outputs between two identical D2O-Pd and H2O-Pd cells greater than 1.5% (or 5%) of the input at 0.5 W (or 2.4 W) was detected. The negative results cannot be attributed to electrolysis-time (0–480 hours), Pd-electrode (cold drawn or cast) size (0.1–0.6 cm diameter × 3–5 cm), power input (0.1–8.5 W), electrolytes used (LiOH, LiCl, and DCl), or failure to deuterize Pd (PdDx with x≤0.6) within the limits cited in the parentheses. If the proposed cold fusion exists, it has to be induced only under some subtle and not-yet-determined conditions.

scholarly journals III-Nitride Semiconductors based Optical Power Splitter Device Design for underwater Application

2018 ◽  
Vol 8 (5) ◽  
pp. 3866 ◽  
Author(s):  
Retno Wigajatri Purnamaningsih ◽  
Nyi Raden Poespawati ◽  
Elhadj Dogheche
Keyword(s):  
Optical Communication ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Chemical Vapor ◽  
Optical Power ◽  
Multimode Interference ◽  
Nitride Semiconductors ◽  
Power Splitter ◽  
Excess Loss ◽  
Underwater Application

In this paper, we introduce III-nitrides based 1× 4 optical power splitter for underwater optical communication applications. To the best of our knowledge, this is a first study for the design of multimode interference (MMI) and four-branch taper waveguide based on GaN/sapphire. The microstructure of GaN semiconductor grown by Metalorganic Chemical Vapor Deposition (MOCVD) on (0001) sapphire reported. The numerical experimental is conducted using the 3D FD-BPM method. The results showed that the optical power splitter has an excess loss of 0.013 dB and imbalance of 0.17 dB. The results open the opportunity for the future device using this technology for the underwater application.

First neutral-beam heating experiments in JET

1987 ◽  
Vol 322 (1563) ◽  
pp. 109-123 ◽  
Keyword(s):  
Power Input ◽  
Input Power ◽  
Confinement Time ◽  
Plasma Parameters ◽  
Energy Confinement ◽  
Energy Confinement Time ◽  
Radiated Power ◽  
Total Input ◽  
Wide Range ◽  
Beam Heating

Hydrogen beams at particle energies of up to 65 keV, total beam powers of up to 5.5 MW , and beam-pulse durations of up to 7 s have been injected into deuterium plasmas. Experiments were performed over a wide range of plasma parameters with limiter plasmas and inner-wall plasmas. The operational regime was extended by 70% over the current ohmic density limit. In medium density experiments, ion temperatures of ca . 6.5 keV were reached with electron temperatures of 4.8 keV. The expected degradation of energy confinement with additional heating was observed. At 4 MA plasma current and 8 MW total input power, the global energy confinement time is ca. 0.4 s. The metallic impurity concentration and Zeff drop with the rise of plasm a density during beam pulses. The rise of radiated power closely follows that of the density. In most cases, the highest value of the radiated power stays below 50 % of the power input, with very low radiation from the centre of the plasma.

scholarly journals Grating Couplers With an Integrated Power Splitter for High-Intensity Optical Power Distribution

2016 ◽  
Vol 28 (11) ◽  
pp. 1173-1176 ◽  
Author(s):  
T. Spuesens ◽  
S. Pathak ◽  
M. Vanslembrouck ◽  
P. Dumon ◽  
W. Bogaerts
Keyword(s):  
Power Distribution ◽  
High Intensity ◽  
Optical Power ◽  
Grating Couplers ◽  
Power Splitter
Sign in / Sign up

Export Citation Format

Share Document