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11	A Novel Remodulation Scheme for WDM PONs Using DPSK for Both Downstream and Upstream Deb, Nebras January 2012 (has links) Wavelength Division Multiplexing Passive Optical Networks (WDM PONs) offer a great solution to satisfy the increasing demand of bandwidth. In addition, it offers a higher level of data security through virtual point to point connections. A great challenge in realizing cost-effective WDM PON is the need for a transmitter at each Optical Network Unit (ONU) with a dedicated wavelength, which overloads the total cost of the system, in addition to reducing the number of available wavelengths in the system. Remodulation scheme is an ultimate solution for these problems of WDM PONs as the downstream signal itself is remodulated with upstream data which saves the need for a laser source at the ONU side. In this thesis I propose and experimentally demonstrate a novel wavelength remodulation scheme for WDM PONs that employs Differential Phase Shift Keying (DPSK) for downstream and Return to Zero DPSK (RZ-DPSK) for upstream. The use of DPSK enhanced the system with improved receiver sensitivity and RZ-DPSK improved the tolerance toward chromatic dispersion. In addition, I investigate the Backreflection (BR) penalty resulting from beat noise of BRs with upstream signal in a bidirectional WDM PON system that uses remodulation and phase modulation as a modulation format. I experimentally demonstrate the optimal conditions to operate the system and minimize the BR penalty. WDM PONs Phase modulation Optical Communications Fiber Optic Remodulation DPSK Backreflection
12	DPSK modulation format for optical communication using FBG demodulator / DPSK modulering för optisk kommunikation med demodulering av FBG Jacobsson, Fredrik January 2004 (has links) <p>The task of the project was to evaluate a differential phase shift keying demodulation technique by replacing a Mach-Zehnder interferometer receiver with an optical filter (Fiber Bragg Grating). Computer simulations were made with single optical transmission, multi channel systems and transmission with combined angle/intensity modulated optical signals. The simulations showed good results at both 10 and 40 Gbit/s. Laboratory experiments were made at 10 Gbit/s to verify the simulation results. It was found that the demodulation technique worked, but not with satisfactory experimental results. The work was performed at Eindhoven University of Technology, Holland, within the framework of the STOLAS project at the department of Electro-optical communication.</p> Electronics DPSK Differential phase shift keying PSK FBG Fiber Bragg Grating MZI Mach- Zehnder optical communication optical signal WDM Wavelength division multiplexing TU/e Eindhoven Holland electro-optical communication optisk kommunikation elektrooptisk kommunikation Elektronik Electronics Elektronik
13	DPSK modulation format for optical communication using FBG demodulator / DPSK modulering för optisk kommunikation med demodulering av FBG Jacobsson, Fredrik January 2004 (has links) The task of the project was to evaluate a differential phase shift keying demodulation technique by replacing a Mach-Zehnder interferometer receiver with an optical filter (Fiber Bragg Grating). Computer simulations were made with single optical transmission, multi channel systems and transmission with combined angle/intensity modulated optical signals. The simulations showed good results at both 10 and 40 Gbit/s. Laboratory experiments were made at 10 Gbit/s to verify the simulation results. It was found that the demodulation technique worked, but not with satisfactory experimental results. The work was performed at Eindhoven University of Technology, Holland, within the framework of the STOLAS project at the department of Electro-optical communication. Electronics DPSK Differential phase shift keying PSK FBG Fiber Bragg Grating MZI Mach- Zehnder optical communication optical signal WDM Wavelength division multiplexing TU/e Eindhoven Holland electro-optical communication optisk kommunikation elektrooptisk kommunikation Elektronik Electronics Elektronik
14	Enhanced Distance Measuring Equipment Data Broadcast Design, Analysis, Implementation, and Flight-Test Validation Naab-Levy, Adam O. January 2015 (has links) No description available. Electrical Engineering Aerospace Engineering eDME Distance Measuring Equipment DME Position, Navigation, and Timing PNT Forward Error Correction FEC Duo-Binary Turbo Codes DBTC LDPC Pulse-Pair Position Modulation PPPM Phase Shift-Keying PSK DPSK Impulsive Interference Flight-test Digital Comm

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