Low Complexity Timing Recovery Algorithm for PAM-8 in High Speed Direct Detection Short Range Links

2017 ◽  
Author(s):  
Aditya Kakkar ◽  
Jaime Rodrigo Navarro ◽  
Xiaodan Pang ◽  
Oskars Ozolins ◽  
Richard Schatz ◽  
...  
Keyword(s):  
High Speed ◽  
Short Range ◽  
Direct Detection ◽  
Low Complexity ◽  
Timing Recovery ◽  
Recovery Algorithm

scholarly journals The impact of inelastic self-interacting dark matter on the dark matter structure of a Milky Way halo

2020 ◽  
Author(s):  
Kun Ting Eddie Chua ◽  
Karia Dibert ◽  
Mark Vogelsberger ◽  
Jesús Zavala
Keyword(s):  
Dark Matter ◽  
High Speed ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Direct Detection ◽  
Major Axis ◽  
Inelastic Collisions ◽  
Axis Ratio ◽  
Lower Velocity ◽  
The Impact

Abstract We study the effects of inelastic dark matter self-interactions on the internal structure of a simulated Milky Way (MW)-size halo. Self-interacting dark matter (SIDM) is an alternative to collisionless cold dark matter (CDM) which offers a unique solution to the problems encountered with CDM on sub-galactic scales. Although previous SIDM simulations have mainly considered elastic collisions, theoretical considerations motivate the existence of multi-state dark matter where transitions from the excited to the ground state are exothermic. In this work, we consider a self-interacting, two-state dark matter model with inelastic collisions, implemented in the Arepo code. We find that energy injection from inelastic self-interactions reduces the central density of the MW halo in a shorter timescale relative to the elastic scale, resulting in a larger core size. Inelastic collisions also isotropize the orbits, resulting in an overall lower velocity anisotropy for the inelastic MW halo. In the inner halo, the inelastic SIDM case (minor-to-major axis ratio s ≡ c/a ≈ 0.65) is more spherical than the CDM (s ≈ 0.4), but less spherical than the elastic SIDM case (s ≈ 0.75). The speed distribution f(v) of dark matter particles at the location of the Sun in the inelastic SIDM model shows a significant departure from the CDM model, with f(v) falling more steeply at high speeds. In addition, the velocity kicks imparted during inelastic collisions produce unbound high-speed particles with velocities up to 500 km s−1 throughout the halo. This implies that inelastic SIDM can potentially leave distinct signatures in direct detection experiments, relative to elastic SIDM and CDM.

40 Gb/s High-speed mode-division multiplexing transmission employing NRZ modulation format

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Rabiu Imam Sabitu ◽  
Nafizah Goriman Khan ◽  
Amin Malekmohammadi
Keyword(s):  
System Performance ◽  
High Speed ◽  
Direct Detection ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Threshold Power ◽  
Modulation Format ◽  
Transmission Distance ◽  
Mode Division Multiplexing ◽  
Speed Mode

AbstractThis report examines the performance of a high-speed MDM transmission system supporting four nondegenerate spatial modes at 10 Gb/s. The analysis adopts the NRZ modulation format to evaluate the system performance in terms of a minimum power required (PN) and the nonlinear threshold power (PTH) at a BER of 10−9. The receiver sensitivity, optical signal-to-noise ratio, and the maximum transmission distance were investigated using the direct detection by employing a multimode erbium-doped amplifier (MM-EDFA). It was found that by properly optimizing the MM-EDFA, the system performance can significantly be improved.

Record high-speed short-range transmission over 1 mm core diameter POF employing DMT modulation

2010 ◽  
Vol 35 (5) ◽  
pp. 730 ◽  
Author(s):  
H. Yang ◽  
S. C. J. Lee ◽  
C. M. Okonkwo ◽  
S. T. Abraha ◽  
H. P. A. van den Boom ◽  
...  
Keyword(s):  
High Speed ◽  
Short Range ◽  
Core Diameter

Power budget of direct-detection ultra-dense WDM-Nyquist-SCM PON with low-complexity SSBI mitigation

2017 ◽  
Vol 36 ◽  
pp. 255-264 ◽  
Author(s):  
Ricardo O.J. Soeiro ◽  
Tiago M.F. Alves ◽  
Adolfo V.T. Cartaxo
Keyword(s):  
Direct Detection ◽  
Low Complexity ◽  
Power Budget ◽  
Dense Wdm

Multimode Fibers for Cost-Effective High-Speed, Short-Range Networks

2012 ◽  
Author(s):  
Denis Molin ◽  
Marianne Bigot-Astruc ◽  
Gerard Kuyt ◽  
Gilles Mélin ◽  
Pierre Sillard
Keyword(s):  
High Speed ◽  
Short Range ◽  
Cost Effective ◽  
Multimode Fibers
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