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We present a novel stabilization technique for millimeter waves produced by interfering two spectral lines of a frequency comb generated by a femtosecond fiber laser. In order to compensate the lasers repetition rate drift, the mm-wave is stabilized via modulation of one extracted comb line. Thus, no access to the lasers cavity is necessary. This leads to a stable and high quality mm-wave with a spectral...
The high resolution spectroscopy of optical signals with a resolution of 30 kHz, based on polarization pulling assisted Brillouin scattering in combination with a narrow linewidth local oscillator, reveals the hidden details of a 500 Mbps PRBS 29-1 sequence.
The generation and stabilization of high quality mm- and THz-waves via extraction of two lines from a fs-laser, with frequencies up to 3 THz, line width below 1 Hz and phase noise of −134 dBc/Hz is presented.
A method to produce flat, rectangular shaped frequency combs with tunable bandwidth and spacing is shown. It is based on the selection of lines from a mode-locked laser and a following modulation with cascaded modulators.
The employment of a high precision femtosecond frequency comb for the tunable generation of ultra-high quality millimeter and THz waves is proposed and demonstrated. The line widths of the generated waves are below 1Hz and a phase noise of −100 dBc/Hz at an offset of 10 kHz from the carrier. The method is based on highly-selective filtering of two comb lines, through stimulated Brillouin scattering...
High-resolution optical spectrum analysis is essential for the measuring and monitoring of advanced optical, millimeter-wave and terahertz communication systems. A method for the measurement of power spectral density functions with a resolution of 5MHz is demonstrated.
The nonlinear optical effect of stimulated Brillouin scattering (SBS) is due to its rather narrow amplification bandwidth very suitable for the application of optical spectroscopy. Mediated by an acoustic wave in the Brillouin medium an optical pump wave is generating a frequency downshifted gain bandwidth of a few tens of MHz for counter propagating waves. By sweeping this gain through an unknown...
The manipulation of the velocity of optical pulses in fibers by so-called slow-light systems seems to be very promising for future all-optical networks, but actual approaches suffer from an inevitable pulse broadening due to the delay process. In this article two different methods for the achievement of zero-broadening in Brillouin based slow-light systems are compared in theory and experiment. While...
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