Research On Optical Signal Processing Based On Silicon Microring Resonator And Brillouin Fiber Laser

With the fast maturity of optical communication technology and rapid development ofmicrowave and radio frequency, microwave photonics technologies have beenattracted more and more attention. Because high quality microwave source is thefoundation of microwave area and performance of laser and all kinds of optical deviceare improved, high quality microwave source in optical domain have obviousadvantages, especially in optoelectronic oscillator (OEO). In this thesis, by the topicof OEO miniature, high quality storage element and narrow linewidth laser areinvestgated.In optical storage element, optical signal processing based on silicon-on-insulator(SOI) microring resonator is studied. On the basis of theoretical analysis of microringresonator, all-optical switching in SOI serially coupled double ring resonator based onthermal nonlinear effect is firstly proposed. In contrat to single microring resonator,double ring resonator can improve the switching extinction ratio (ER).20.2dB of ERand μs of switching time are obtained. Then, all optical delay based on single siliconmicroring resonator with10μm is proposed. The maxmimum delay is15.7ps. Dualwavelength ultra-wide band pulses based on a parallel double ring resonator with20μm radius is proposed.0.84nm wavelength spacing is demonstrated and33.96ps and53.19ps FWHM of ultra-wide band monocycle pulses are obtained which isagreement with FCC standard.Narrow linewidth Brillouin fiber laser (BFL) is used as OEO pump source. On thebasis of theoretical analysis of BFL, a novel narrow linewidth dual ring singlelongitudinal mode (SLM) BFL is proposed. The main single pass ring is constructedwith a100m or50m single mode fiber (SMF) to which is used as laser gain medium.The other ring is configured with a10m SMF of traditional BFL. According to thetheoretical analysis, threshold and linewidth of dual ring BFL are better thantraditional SLM BFL on the condition of same finess and loss. The SLM BFL with56mW and99mW threshold,0.41kHz and3.23kHz linewidth are obtained. An autotracking system is configured high precision PM-ODL so that environmentdisturbance is reduced.6%power fluctuation in1h is obtained. High order Stokes waves can affect directly the performance of OEO. Thus, on thebasis of SLM BFL and in order to investigate cascaded SBS, a novel multiwavelengthdual ring Brillouin fiber laser (MW BFL) is proposed. The main single pass ring isalso constructed a100m or50m single mode fiber (SMF). In order to guarantee theSLM operation of each Stokes waves and anti-Stokes waves, the other ring is alsoconfigured with a10m SMF. The system is enclosed in temperature control system sothat environment disturbance is reduced. Linewidth between each Stokes waves andmain factor of BFL stability are theoretically analyzed. The laser with51Stokeswaves can freely and steadily be tuned30nm ranges from1535nm to1565nm with0.084nm wavelength spacing.