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Rao, Srinivasa
- OFDM –WDM Architecture with Extended Reach and 1100 Split Ratio for Next Generation Passive Optical Networks
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Authors
Affiliations
1 School of Electronics and Communication Engineering, VIT University, Vellore 632014, Tamil Nadu, IN
1 School of Electronics and Communication Engineering, VIT University, Vellore 632014, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 8, No S7 (2015), Pagination: 6-10Abstract
In this paper, we investigate OFDM-WDM-PON as an effective method for achieving high data rates in which OFDM is used as key element to combat dispersion. Large guard band intervals between adjacent OFDM symbols accommodate the distortion introduced by chromatic dispersion leading to reduced ISI. The system design involves the realization of FTTH by integrating OFDM, WDM and PON. OFDM also aids in improving receiver sensitivity. An aggregate of 40 Gbps, Direct detection OFDM-WDM-PON is designed and analyzed. Dispersion compensation techniques are used to achieve a bit error rate in the order of 10-8 and a split ratio of 1100 is achieved.Keywords
OFDM, PON, WDM.Full Text
- Structural and Optical Investigation of Al Doped ZnO Nanoparticles Synthesized by Sol-gel Process
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Authors
Affiliations
1 Department of Physics, Lingaya’s University, Faridabad – 121001, Haryana, IN
2 Lingaya’s University, Faridabad – 121001, Haryana, IN
3 Department of E. C. E, K. L University, Vaddeswaram – 522502, Andhra Pradesh, IN
1 Department of Physics, Lingaya’s University, Faridabad – 121001, Haryana, IN
2 Lingaya’s University, Faridabad – 121001, Haryana, IN
3 Department of E. C. E, K. L University, Vaddeswaram – 522502, Andhra Pradesh, IN
Source
Indian Journal of Science and Technology, Vol 9, No 12 (2016), Pagination:Abstract
Background/Objectives: Nanoparticles possess unique properties due large surface to volume ratio and quantum confinement effect. ZnO is suitable for laser diodes, LEDs and Photodetectors due to wide direct band gap, high melting point, high thermal conductivity etc. Methods/Statistical analysis: Pure Zinc oxide and Al doped ZnO Nanopowders are fabricated by Sol-gel method. Influence of Al doping on structural and optical properties of Nanopowders were analyzed by X Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), UVVisible optical absorption (UV-Vis) and Photoluminescence (PL) Characterizations. Sol-gel method is preferred due to its simplicity, low Cost and Environment friendly. Structural properties including crystalline size, Lattice strain were obtained from XRD. Morphology of Nanopowders confirmed from SEM micrographs observed at different magnifications. Presence of functional groups obtained from FTIR spectra. Band gap is determined from UV-Visible optical absorption spectroscopy. Luminescence emissions were confirmed from PL characterizations. Findings: The average crystalline size of Nanopowders is found to be 36.448 nm and 62.83 nm for pure ZnO and Al doped ZnO nanopowders respectively. The morphology strongly influenced by doping with Aluminum. Structural properties of nanoparticles again proved from FTIR Spectra. The energy band gap value of Nanoparticles obtained is found to be decreased by doping with Al. The increase in the light output intensity could be attributed to increase in the Light transmittance. Application/Improvements: The synthesized Nanopowders can be used in the fabrication of ZnO Nanorods, Nanowires which is an attractive potential application in the Light emitting devices, UV Photodetectors.Keywords
Nanoparticles, Scanning Electron Microscopy, UV-Visible Optical Absorption, X-Ray Diffraction, Zinc OxideFull Text