American Journal of Optics and Photonics

Volume 6, Issue 1, March 2018

  • Characterization of Laser Ablated SrAl2O4:Eu2+, Dy3+ Thin Films Deposited on the Optimum Substrate Temperature Range

    Patrick Damson Nsimama

    Issue: Volume 6, Issue 1, March 2018
    Pages: 1-7
    Received: Nov. 18, 2017
    Accepted: Dec. 21, 2017
    Published: Jan. 16, 2018
    Abstract: The morphological, structural and photoluminescence (PL) of laser ablated SrAl2O4:Eu2+, Dy3+ thin films deposited on optimum substrate temperature range of 200-500°C are reported. The 200-500°C substrate temperature was considered, since on that range, low cost highly emitting SrAl2O4:Eu2+, Dy3+ thin films are always produced. The surface morpholog... Show More
  • The Effect of He-Ne and Diode Lasers on the Electrical Characteristics of Silicon Diode

    Yousif Hassan Alsheikh Abd Alraheim, Zainab Abdulla Mohamed Taha, Zainab Mohamed Taha

    Issue: Volume 6, Issue 1, March 2018
    Pages: 8-13
    Received: Oct. 30, 2017
    Accepted: Nov. 11, 2017
    Published: Jan. 18, 2018
    Abstract: The effect of He-Ne (632.8 nm) and diode (650 nm) lasers on the electrical characteristics of silicon diode have been studied. The electrical characteristics of the diode were recorded before laser irradiations, then the diode is subjected to He-Ne laser for 5 and 10 minutes and then the diode electrical characteristics were recorded for each time ... Show More
  • BER Performance of PDM 4-QAM Optical Transmission System Considering the Effects of PMD and GVD Using Exact Probability Density Function

    Kazi Abu Taher, Satya Prasad Majumder

    Issue: Volume 6, Issue 1, March 2018
    Pages: 14-19
    Received: Jan. 20, 2018
    Accepted: Feb. 11, 2018
    Published: Mar. 14, 2018
    Abstract: A noble theoretical approach is presented to evaluate the bit error rate (BER) performance of an optical polarization division multiplexed (PDM) 4-multilevel quadrature amplitude modulation (4-QAM) transmission system under the combined influence of polarization mode dispersion (PMD) and group velocity dispersion (GVD) in a single mode fiber (SMF).... Show More