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Research On Fiber Lasers & Their Applications In WDM Communication System

Posted on:2002-03-07Degree:DoctorType:Dissertation
Country:ChinaCandidate:L DingFull Text:PDF
GTID:1118360185478947Subject:Optics
Abstract/Summary:PDF Full Text Request
Optical communication supplies the rapidly developing IT (information technology) industry with an optimal information transmitting technique and has become an important part of the national information infrastructure. In order to satisfy the request of superhigh-speed, superhigh-capacity optical communication system, lots of optical communication models appear. Among them, the WDM (wavelength division multiplexing) technique becomes a hot subject and a research frontier because of its reconfigurability, transparency, compatibility and survivability.Many new types of active fiber components and passive fiber components are being researched and developed to meet the demand of WDM communication systems. Among the active fiber components, the fiber lasers, especially the fiber lasers based on FBGs (fiber Bragg gratings), attract researchers'attention because of its simple integrability with the basic fiber systems and good temperature stability. Fiber lasers are emerging as an interesting alternative to semiconductor laser diodes for use in future WDM communication system. The dissertation focuses on fiber lasers and includes the detailed descriptions on the following subjects:1. Experimental studies on Fabry-Perot cavity fiber lasers(1) The experimental study on a dual-wavelength DBR (distributed Bragg reflection) EDFL (erbium-doped fiber laser) is conducted. The laser's output power is amplified by utilizing the surplus pump energy. The laser's self-Q-switched pulses are observed and theoretically analyzed.(2) An erbium-ytterbium co-doped fiber laser is realized through co-operation. It has a threshold of 40.4mW, a slope efficiency of 1.08% and an output power of 1.11mW.(3) An ytterbium-doped double-clad fiber laser is made through co-operation. The laser exhibits 83.4mW threshold, 79.6% slope efficiency and as high as 233mW output power.2. Experimental studies on ring cavity fiber lasers(1) A novel electrically tunable FBG EDFL is reported. The tuning range is about 1.6nm.(2) An EDFL's SNR is improved 5.2dB by eliminating the counter ASE (amplified spontaneous emission).
Keywords/Search Tags:FBG, Fabry-Perot cavity fiber laser, erbium-ytterbium co-doped fiber, ytterbium-doped double-clad fiber, ring cavity fiber laser, electrically tunable, multi-wavelength, Q-switched, mode-locked, all-fiber experimental WDM system
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