Browsing by Author "Ozharar, Sarper"

Now showing 1 - 5 of 5

Citation - WoS: 1
Citation - Scopus: 1
Simultaneous Low Noise Radio Frequency Tone and Narrow Linewidth Optical Comb Generation From a Regeneratively Mode-Locked Laser
(SPIE - Society of Photo-Optical Instrumentation Engineers, 2014) Ozdur, Ibrahim; Ozharar, Sarper; Delfyett, Peter J.
A regeneratively mode-locked laser with simultaneous low noise radio frequency (RF) tone and optical comb generation is presented. The laser does not need any external RF signal and emits a pulse train at similar to 10 GHz repetition rate with a 1.5-ps optical pulse width after compression. The generated RF tone has a signal-to-noise ratio of 121 dB/Hz and an RF fluctuation of 10(-9) over 0.1 s. The optical frequency comb spacing is also at similar to 10 GHz and the optical comb tooth has a linewidth of <1 kHz. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Citation - WoS: 5
Citation - Scopus: 5
Amplitude Noise Suppression by Intracavity Phase Modulation in a Harmonically Mode-Locked Laser
(Elsevier Sci Ltd, 2018) Ozharar, Sarper; Ozdur, Ibrahim
A fiber coupled semiconductor ring laser that employs both an amplitude and a phase modulator was built and actively harmonic mode-locked at a repetition rate of 10 GHz. The phase modulator was driven at the cavity fundamental frequency and its effects on the optical spectrum and the optical pulse train were analyzed. The intracavity phase modulation at the cavity fundamental frequency resulted in 40% lower optical pulse amplitude fluctuations and improved the stability of the optical spectrum. (C) 2018 Elsevier Ltd. All rights reserved.
Multifunction Optoelectronic Gate
(Wiley-Blackwell, 2015) Ozharar, Sarper; Ozdur, Ibrahim; Delfyett, Peter J.
A multifunction optoelectronic gate that can perform as any desired logic gate of two variables was theoretically proposed and a simplified version is experimentally demonstrated. The proposed optoelectronic gate is dynamically configurable, and being wavelength independent, it can act on multiple input optical bits and realize different functions simultaneously. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:969-972, 2015
Citation - WoS: 1
Citation - Scopus: 1
RF Phase Noise Filtering Properties of an Actively Mode-Locked Laser
(Wiley, 2018) Mbonde, Hamidu; Ozharar, Sarper; Ozdur, Ibrahim
In this article, we are presenting the experimental results and theoretical analysis of radio frequency (RF) phase noise filtering properties of a high Q cavity actively driven mode-locked laser. The experimental results show that, the phase noise of a 10 GHz RF tone can be filtered by at least 10 dB at 200 kHz offset frequency. A theoretical analysis on the limits of phase noise filtering due to the spontaneous emission and the frequency mismatch between the laser cavity modes and the synthesizer frequency is also included.
Citation - WoS: 1
Citation - Scopus: 1
RF Injection Locked 18 GhZ Regeneratively Mode-Locked Semiconductor Laser
(Optical Soc Amer, 2018) Oran, Abdullah; Ozharar, Sarper; Can, Gokhan; Olcer, Ibrahim; Ozdur, Ibrahim
In this manuscript, a semiconductor based fiber ring cavity mode-locked laser regeneratively driven at 18 GHz is presented. The optical spectrum of the laser is centered at 1578 nm. The laser is RF injection locked via an external source at 18 GHz. The phase noise of the mode-locked laser is measured and the integrated timing jitter was found to be 10.8 fs (from 100 Hz to 20 MHz) and 13.3 fs (from 100 Hz to Nyquist frequency). The integrated amplitude fluctuation (from 100 Hz to 20 MHz) was less than 0.02%. The laser phase and amplitude noise responses to various injected RF power levels were also investigated. The injection RF power has significant effect on the phase noise and the best jitter value is around 40 dB lower than the cavity regenerated RF power. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement