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Sooraj Parkash,Anurag Sharma,Manoj Kumar,Harsukhpreet Singh 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.8
In this paper, Decision Feedback Equalization (DFE) and Feed forward Equalization (FFE)based on minimum mean square error optimization has been employed to improve the performance of 32 channels, gigabit capacity WDM-PON network. An optical line terminal (OLT) installed at the transmitter end which continuous transmit 32 channels having different colors (wavelengths) of 20GB/s data rate , which is multiplexed by optical multiplexer and transmit through standard single mode fiber (SMF) having length 40km. A link design for 1:64 optical splitters is used as Passive Optical Network (PON) element which creates communication between OLT to different end users. It is observed that FFE and DFE significantly reduce BER by 1.0798e-010, 1.1556e-011, 1.2960e-010 and 8.8979e-009 at four different wavelengths 1550nm, 1559.6nm, 1562.8nm and 1574.8nm by using NRZ (non return zero) modulation format at 20GB/s for 64 users having 40km fiber length respectively. Sharp increase in BER 2.6916e-002, 4.6519e-002, 3.8804e-001 and 5.1570e-002 occurs if data rate increases up to 25 GB/s.
Ravindran, Sooraj,Datta, Arnab,Alameh, Kamal,Lee, Yong Tak Optical Society of America 2012 Optics express Vol.20 No.14
<P>We propose and analyse a GaAs-based optical switch having a ring resonator configuration which can switch optical telecommunication signals over the 1300 nm and 1500 nm bands, using bias assisted carrier injection as the switching mechanism. The switching is achieved through variation in the refractive index of the ring resonator produced by changing the injected carrier density through the application of bias voltage. Detail analysis of the switching characteristics reveals that the amount of switching depends on the refractive index change, which indeed is a strong function of injected carrier density and applied bias voltage. An isolation of 25 dB can be achieved during the ON state, while more than 40 dB isolation is realised during the OFF state. More importantly, our analysis shows that the proposed GaAs-based switch can operate over the 1300 nm and 1500 nm optical telecommunication bands, that are much farther from the bandgap of the GaAs material, without the need for 'conventional' Indium based ternary and quaternary semiconductor materials. It therefore extends the usable wavelength of GaAs based optoelectronic devices. Furthermore, we have presented detail calculations to quantify power-delay metric of the proposed device. The proposed optical switch maintains a smaller footprint as when compared to Mach-Zehnder Interferometer or Directional Coupler based switches therefore, making it suitable for large scale integration and implementing next generation optical interconnects, optical communication and computing.</P>
Kwangwook Park,Sooraj Ravindran,주건우,Jung-Wook Min,Seokjin Kang,명노성,Sang-Youp Yim,조용륜,김봉중,Yong-Tak Lee 한국물리학회 2016 Current Applied Physics Vol.16 No.12
GaAs/GaInAs multiple-quantum-well (MQW) shells having different GaInAs shell width formed on the surface of self-catalyzed GaAs core nanowires (NWs) are grown on (100) Si substrate using molecular beam epitaxy. The photoluminescence emission from GaAs/GaInAs MQW shells and the carrier lifetime could be varied by changing the width of GaInAs shell. Time-resolved photoluminescence measurements showed that the carrier lifetime had a fast and slow decay owing to the mixing of wurtzite and zincblende structures of the NWs. Furthermore, strain relaxation caused the carrier lifetime to decrease beyond a certain thickness of GaInAs quantum well shells.
A possible mechanism for El Niño‐like warming in response to the future greenhouse warming
Kug, Jong‐,Seong,Sooraj, K. P.,Jin, Fei‐,Fei,Ham, Yoo‐,Geun,Kim, Daehyun John Wiley Sons, Ltd. 2011 International journal of climatology Vol.31 No.10
<P><B>Abstract</B></P><P>Using the climate change experiments generated for the Fourth Assessment of the Intergovernmental Panel on Climate Change, a possible mechanism for the El Niño‐like warming in response to the greenhouse warming is suggested. From the coupled global climate model (CGCM) simulations with climate change scenario, it is found that the Bjerknes air–sea coupled process is a dominant contributor to the tropical Pacific response. However, it is revealed that most CGCMs commonly simulate the off‐equatorial maximum of precipitation change. It is suggested here that the off‐equatorial precipitation and the associated equatorial westerlies play a seeding role in triggering an El Niño‐like warming response. Atmospheric GCM (AGCM) experiments show that even uniform sea‐surface temperature (SST) warming leads to off‐equatorial increase in precipitation which brings equatorial westerlies, implying that these non‐uniform (off‐equatorial) responses can play a seeding role for the El Niño‐like warming pattern. Copyright © 2010 Royal Meteorological Society</P>
A TURÁN-TYPE INEQUALITY FOR ENTIRE FUNCTIONS OF EXPONENTIAL TYPE
Shah, Wali Mohammad,Singh, Sooraj The Kangwon-Kyungki Mathematical Society 2022 한국수학논문집 Vol.30 No.2
Let f(z) be an entire function of exponential type τ such that ║f║ = 1. Also suppose, in addition, that f(z) ≠ 0 for ℑz > 0 and that $h_f(\frac{\pi}{2})=0$. Then, it was proved by Gardner and Govil [Proc. Amer. Math. Soc., 123(1995), 2757-2761] that for y = ℑz ≤ 0 $${\parallel}D_{\zeta}[f]{\parallel}{\leq}\frac{\tau}{2}({\mid}{\zeta}{\mid}+1)$$, where D<sub>ζ</sub>[f] is referred to as polar derivative of entire function f(z) with respect to ζ. In this paper, we prove an inequality in the opposite direction and thereby obtain some known inequalities concerning polynomials and entire functions of exponential type.