Browsing by Author "Bay, Mehmet"

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    Ultraflat optical comb generation by phase-only modulation of continuous-wave light
    (Bahçeşehir Üniversitesi Fen Bilimleri Enstitüsü, 2012-06) Bay, Mehmet; Özharar, Sarper
    Scientific studies about laser engineering specifically, generation and applications of stable optical frequency combs, have gained great interest of the scientists due to their intrinsic physical properties and very large area of application in technology such as, arbitrary waveform generation and spectral measurements. The main source of optical frequency combs are mode-locked laser. However, mode-locked lasers are not easy to build and have very high cost nad high maintenance compared to our method. Moreover our proposed approach can be replace mode locked lasers in some areas such as,communication and microwave photonics and network testing. In this thesis, we are particularly focused on theoretical approach of the generation of stable optical frequency combs. Furthermore, Optical frequency combs are consist of equally spaced optical frequency with a fixed phase relation between themselves. Our method requires a single optical element and it is very practical and efficient in terms of both power budget and cost compared to modelocked lasers. The optimization where the necessary modulation parameters are calculated, is the most important part of this thesis. In order to calculate them, an error function is defined. Moreover, the variance, the maximum and the mean value of the comb lines amplitudes are used in defining the error function. Using this approach we have generated an optical spectrum with 26 comb lines and 3 db flatness theoretically. There are two kind of modulations that are explained in detail in their corresponding sections: one is amplitude modulation and the second is phase modulation which is used in the theoretical work. Finally the thesis concludes with comments about the future work which includes the development of the following amendments of the results presented in this study.