scholarly journals Maximization of Gain in Slow-Light Silicon Raman Amplifiers

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Ivan D. Rukhlenko ◽  
Malin Premaratne ◽  
Govind P. Agrawal
Keyword(s):  
Slow Light ◽  
Design Guidelines ◽  
Maximum Speed ◽  
Raman Amplifier ◽  
Silicon Photonic ◽  
Raman Amplifiers ◽  
Optical Modes ◽  
First Time ◽  
Analytical Expressions ◽  
Pump Depletion

We theoretically study the problem of Raman gain maximization in uniform silicon photonic-crystal waveguides supporting slow optical modes. For the first time, an exact solution to this problem is obtained within the framework of the undepleted-pump approximation. Specifically, we derive analytical expressions for the maximum signal gain, optimal input pump power, and optimal length of a silicon Raman amplifier and demonstrate that the ultimate gain is achieved when the pump beam propagates at its maximum speed. If the signal’s group velocity can be reduced by a factor of 10 compared to its value in a bulk silicon, it may result in ultrahigh gains exceeding 100 dB. We also optimize the device parameters of a silicon Raman amplifier in the regime of strong pump depletion and come up with general design guidelines that can be used in practice.

Slow-light Enhanced Nonlinear Optics in Silicon Photonic Crystal Waveguides

PIERS Online ◽  
2010 ◽  
Vol 6 (3) ◽  
pp. 273-278 ◽  
Author(s):  
David J. Moss ◽  
B. Corcoran ◽  
C. Monat ◽  
Christian Grillet ◽  
T. P. White ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Nonlinear Optics ◽  
Slow Light ◽  
Photonic Crystal Waveguides ◽  
Silicon Photonic

scholarly journals Double-layer graphene on photonic crystal waveguide electro-absorption modulator with 12 GHz bandwidth

Nanophotonics ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 2377-2385 ◽  
Author(s):  
Zhao Cheng ◽  
Xiaolong Zhu ◽  
Michael Galili ◽  
Lars Hagedorn Frandsen ◽  
Hao Hu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Double Layer ◽  
Slow Light ◽  
Modulation Depth ◽  
Photonic Crystal Waveguide ◽  
Optical Modulators ◽  
Layer Graphene ◽  
Silicon Photonic ◽  
On Chip ◽  
Silicon Based

AbstractGraphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer graphene electro-absorption modulator in telecommunication applications. The modulator exhibits a modulation depth of 0.5 dB/μm with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 μm in simulations. We also fabricated the graphene modulator on silicon platform, and the device achieved a modulation bandwidth at 12 GHz. The proposed graphene-PhCW modulator may have potentials in the applications of on-chip interconnections.

scholarly journals Observation of four-wave mixing in slow-light silicon photonic crystal waveguides

2010 ◽  
Vol 18 (15) ◽  
pp. 15484 ◽  
Author(s):  
James F. McMillan ◽  
Mingbin Yu ◽  
Dim-Lee Kwong ◽  
Chee Wei Wong
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Photonic Crystal Waveguides ◽  
Silicon Photonic

scholarly journals Dielectric Function of a Quantum-Confined Thin Film with a Modified Pöschel–Teller Potential

2018 ◽  
Vol 63 (12) ◽  
pp. 1109 ◽  
Author(s):  
Kh. A. Gasanov ◽  
J. I. Guseinov ◽  
I. I. Abbasov ◽  
F. I. Mamedov ◽  
D. J. Askerov
Keyword(s):  
Dielectric Permittivity ◽  
Electron Gas ◽  
Two Dimensional ◽  
Quantum Nanostructures ◽  
Carrier Scattering ◽  
Scattering Potential ◽  
Quantum Confined ◽  
Charge Carrier Scattering ◽  
First Time ◽  
Analytical Expressions

The spatial and time dispersions of the dielectric permittivity of an electron gas in quasi-two-dimensional quantum nanostructures are studied. The screening of the charge-carrier scattering potential in a quantum-confined film with a modified P¨oschel–Teller potential is considered for the first time. Analytical expressions for the dielectric permittivity are obtained.

scholarly journals Ionization correction factors for sodium, potassium, and calcium in planetary nebulae

2019 ◽  
Vol 492 (1) ◽  
pp. 950-965
Author(s):  
A Amayo ◽  
G Delgado-Inglada ◽  
J García-Rojas
Keyword(s):  
Planetary Nebulae ◽  
Emission Lines ◽  
Condensation Temperature ◽  
Correction Factors ◽  
Dust Grains ◽  
Degree Of Ionization ◽  
Sodium Potassium ◽  
First Time ◽  
Analytical Expressions ◽  
Large Grid

ABSTRACT We use a large grid of photoionization models that are representative of observed planetary nebulae (PNe) to derive ionization correction factors (ICFs) for sodium, potassium, and calcium. In addition to the analytical expressions of the ICFs, we provide the range of validity where the ICFs can be safely used and an estimate of the typical uncertainties associated with the ICFs. We improved the previous ICFs for calcium and potassium in the literature and suggest for the first time an ICF for sodium. We tested our ICFs with a sample of 39 PNe with emission lines of some ion of these elements. No obvious trend is found between the derived abundances and the degree of ionization, suggesting that our ICFs do not seem to be introducing an artificial bias in the results. The abundances found in the studied PNe range from $-2.88_{-0.22}^{+0.21}$ to −2.09 ± 0.21 in log (Na/O), from $-4.20_{-0.45}^{+0.31}$ to $-3.05_{-0.47}^{+0.26}$ in log (K/O), and from $-3.71_{-0.34}^{+0.41}$ to $-1.57_{-0.47}^{+0.33}$ in log (Ca/O). These numbers imply that some of the studied PNe have up to ∼65 per cent, 75 per cent, or 95 per cent of their Na, K, and/or Ca atoms condensed into dust grains, respectively. As expected, the highest depletions are found for calcium which is the element with the highest condensation temperature.

Silica-Clad Silicon Photonic Crystal Waveguides for Wideband Dispersion–Free Slow Light

2015 ◽  
pp. 1-1 ◽  
Author(s):  
Takuya Tamura ◽  
Keisuke Kondo ◽  
Yosuke Terada ◽  
Yosuke Hinakura ◽  
Norihiro Ishikura ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Photonic Crystal Waveguides ◽  
Silicon Photonic

scholarly journals Four-wave mixing in slow light engineered silicon photonic crystal waveguides

2010 ◽  
Vol 18 (22) ◽  
pp. 22915 ◽  
Author(s):  
C. Monat ◽  
M. Ebnali-Heidari ◽  
C. Grillet ◽  
B. Corcoran ◽  
B. J. Eggleton ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Photonic Crystal Waveguides ◽  
Silicon Photonic
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