Now showing items 1-11 of 11

    • 3.5-W, femtosecond chirped pulse amplification fiber laser system at 1560 nm 

      Elahi, Parviz; Li, Huihui; İlday, Fatih Ömer (IEEE, 2017)
      We report a single-mode, 42 MHz, 3.5-W average power chirped pulse amplification fiber laser system operating at 1560 nm. The laser system comprises a dispersion-managed mode-locked oscillator and twoamplifier stages. The ...
    • 50-W, 1.6-GHz pulse repetition rate from a burst-mode Yb-doped fiber laser 

      Elahi, Parviz; Ertek, A. C.; Eken, K.; İlday, Fatih Ömer (IEEE, 2017)
      We report a 50-W average power Yb-doped fiber laser amplifier system. The laser system produces bursts at a minimum rate of 200 kHz, with 1.6 GHz intraburst repetition rate. The total energy delivers in a burst is 250 μJ ...
    • Detector randomization and stochastic signaling for minimum probability of error receivers 

      Dulek, B.; Gezici, S. (Institute of Electrical and Electronics Engineers, 2012)
      Optimal receiver design is studied for a communications system in which both detector randomization and stochastic signaling can be performed. First, it is proven that stochastic signaling without detector randomization ...
    • Doping management for high-power fiber lasers: 100 W, few-picosecond pulse generation from an all-fiber-integrated amplifier 

      Elahi, P.; Yilmaz, S.; Akçaalan, Ö.; Kalaycioğlu, H.; Öktem, B.; Şenel, Ç.; Ilday, F. Ö.; Eken, K. (Optical Society of America, 2012-07-16)
      Thermal effects, which limit the average power, can be minimized by using low-doped, longer gain fibers, whereas the presence of nonlinear effects requires use of high-doped, shorter fibers to maximize the peak power. We ...
    • High average and peak power femtosecond large-pitch photonic-crystal-fiber laser 

      Baumgartl, M.; Jansen F.; Stutzki F.; Jauregui, C.; Ortaç, B.; Limpert J.; Tünnermann, A. (2011)
      We report on the generation of high-average-power and high-peak-power ultrashort pulses from a mode-locked fiber laser operating in the all-normal-dispersion regime. As gain medium, a large-mode-area ytterbium-doped ...
    • High-energy femtosecond photonic crystal fiber laser 

      Lecaplain, C.; Ortaç, B.; MacHinet G.; Boullet J.; Baumgart, M.; Schreiber, T.; Cormier, E.; Hideur, A. (2010)
      We report the generation of high-energy high-peak power pulses in an all-normal dispersion fiber laser featuring large-mode-area photonic crystal fibers. The self-starting chirped-pulse fiber oscillator delivers 11 W of ...
    • Non-thermal material and tissue processing with 100 MHz and 500 MHz repetition rate bursts 

      Kerse, Can; Kalaycıoğlu, Hamit; Akaalan O.; Eldeniz, Y.B.; İlday, F. Ömer; Hoogland H.; Holzwarth, R. (IEEE, 2013)
      There are a number of applications that would avail a pulse pattern in the form of closely grouped and uniformly spaced pulses, i.e., bursts [1]. Closely grouped pulses with pulse to pulse separation in the order of a few ...
    • On the optimality of stochastic signaling under an average power constraint 

      Göken, Çağrı; Gezici, Sinan; Arıkan, Orhan (IEEE, 2010-09-10)
      In this paper, stochastic signaling is studied for scalar valued binary communications systems over additive noise channels in the presence of an average power constraint. For a given decision rule at the receiver, the ...
    • Optimal stochastic design for multi-parameter estimation problems 

      Soğancı, Hamza; Gezici, Sinan; Arıkan, Orhan (IEEE, 2014- 05)
      In this study, we consider performance improvement of an array of fixed estimators by using stochastic design techniques. The optimal design is investigated both in the absence and presence of an average power constraint. ...
    • Optimal stochastic parameter design for estimation problems 

      Soganci, H.; Gezici, S.; Arikan, O. (Institute of Electrical and Electronics Engineers, 2012)
      In this study, the aim is to perform optimal stochastic parameter design in order to minimize the cost of a given estimator. Optimal probability distributions of signals corresponding to different parameters are obtained ...
    • Theoretical analysis of doping management 

      Gürsel, A. T.; Elahi, Parviz; İlday, F. Ömer; Ozyazici, M.S. (IEEE, 2013)
      Two opposing requirements, such as thermal load and nonlinear effects are important limitations in rapid progress of high-power fiber laser technologies. Thermal effects, which limit the average power, can be minimized by ...