Thesis (Ph. D.)--Oregon Graduate Center, 1978.

Thesis (Ph. D.)--Oregon Graduate Center, 1976.

Ph.D. / Physics / This work presents results pertinent to the study of spatial diversity as a means for partially overcoming the deleterious effects of the clear-air turbulent atmosphere on direct detection and heterodyne optical communication systems. For photon counting receivers, an averaged threshold receiver is presented, which is seen to be simpler to implement and to provide consistently lower bit error rates than optimized memoryless receivers. The heterodyne results include the introduction of a partial tracking heterodyne array; a discussion, both theoretical and experimental, of IF signal magnitude probability distributions for static heterodyne arrays; and a theoretical treatment of the probability distribution for a single heterodyne element with angle-of-arrival tracking.

No description available.

Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Electrical and Computer Engineering, 2009. / Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaf 68). Also available via the Internet.

Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Electrical and Computer Engineering, 2009. / Includes bibliographical references.

Approved for public release; distribution is unlimited / Free Space Optics (FSO) technology is an alternative broadband technology, which provides fast, secure and reliable data transmission. The FSO systems are being used for commercial systems between fixed sites and are being considered for military systems because of their inherent benefits, which are security and high data rates. In military communications security is the first priority. The small divergence of the laser beam makes FSO systems more secure than the existing radio frequency (RF) based wireless systems, because it is highly difficult to detect and intercept a laser beam due to the nature of the laser and the small divergence angle of the transmitter. However, FSO implementation on mobile platforms such as ships is still challenging. This thesis analyzes the feasibility of deploying FSO system on navy surface ships. It discusses the FSO technology and the latest studies in maritime optical communication links. In addition, the benefits and challenges of FSO technology specific to this study are studied. The final section discusses the required systems to improve the performance of FSO systems on ships. The thesis concludes that FSO technology, while not ready for deployment, looks very promising for the near future. / Lieutenant Junior Grade, Turkish Navy

Approved for public release; distribution is unlimited / Currently the Navy uses microwave technology to wirelessly connect ships at sea. These systems provide approximately a 1.5Mb/s transfer rate and have some significant drawbacks. Microwave antennas provide a very large electromagnetic signature, require a large power source, and require a lot of support equipment and personnel to maintain connections. Laser technology can offer connection speeds 50 times greater than microwave, have no electromagnetic signature, use only a fraction of the space and power requirements, and require little to no personnel maintenance. Lasers offer many advantages to its microwave counterpart but it may also have some drawbacks. This paper addresses the effects inclement weather will have on range and bandwidth. Weather ranging from fog to heavy rain also is analyzed in relation to the current system. Aside from communications between ships, lasers offer other untouched tactical benefits including - enhanced communications between ships and remote controlled drones. Unmanned vehicles could provide full motion video, telemetry, atmospheric conditions, and provide an uplink for smaller water or land based terminals to the ship. / Ensign, United States Navy

Jia, Wei. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 137-156). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.