Investigation Of Novel Fiber Laser Technology

With the development of fiber communication, fiber manufacturing and laser productiontechnology, the fiber lasers develop rapidly as a new fiber device. Fiber laser acquires moreattentions because of its potential technical advantages and wide application prospect on ultraspeed dense wavelength-division-multiplexing communication system, high precision sensingtechnology，high power laser processing and microwave photonic signal processing. The maincontent of the thesis is listed as below:1. By the investigation of optical spectra, radio frequency and time domain waveforms of theFourier domain mode locked (FDML) fiber laser, we proposed a simple method based onsuper-mode noise peaks to monitor the FDML fiber laser output quality.2. A widely wavelength tunable single frequency fiber laser based on FP-LD injection lockingis proposed. The FP-LD under injection locking can effectively narrow the line-width of theinjected multi-longitudinal-mode (MLM) light at each roundtrip. By inserting a FP-LD in afiber ring laser cavity, single frequency operation can be possibly achieved when stable laseroscillation established after many roundtrips through the FP-LD. The proposed fiber lasercan be tuned in a wide wavelength range from1531.26nm to1563.66nm, with SMSR of>41dB and a line-width of <13kHz.3. A novel multi-wavelength narrow line-width Er-doped fiber laser based on FP-LDs hasbeen presented. The FP-LDs in the laser cavity not only act as wavelength selection devices,but also can effectively alleviate the mode competition induced by the homogeneous gainbroadening in the EDF. We respectively achieve a16-wavelength and20-wavelength narrowbandwidth oscillation with a wavelength-spacing of about1.25nm in the cascaded andparallel FP-LDs based multi-wavelength EDFLs. The power fluctuation of each wavelengthfor both of the proposed EDFL is less than0.4dB.