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A very clean and low phase noise microwave oscillator is required for communication and high resolution imaging. A frequency stabilized and tunable opto-electronic oscillator (OEO) is realized as synthesizer using a long fiber optic delay line combined with a tunable narrowband microwave filter. Forced oscillation using both self-injection locking and self-phase lock loop, as SILPLL provides an ultra-low...
We present two dual loop optoelectronic oscillators using short fibers (1 km range). Fiber lengths are optimized using a simple model which predicts both configurations ultra-low phase noise results, improving either the close-to-carrier phase noise, or the spur level.
The lowest phase noise microwave signals are now produced by photonic methods. This talk will describe some of these methods, with special attention given to optical frequency division.
We demonstrate a novel all-fiber repetition-rate stabilization method of mode-locked lasers. The method is based on an all-fiber Michelson interferometer with a km-scale fiber delay line. By stabilizing the laser to a 7-km-long fiber delay, the absolute integrated rms timing jitter of mode-locked Er-fiber laser is suppressed from 10 ps to 6.5 fs over 1 s. The absolute frequency instability (Allan...
1.026-THz signal generated by an optical frequency comb generator is evaluated on its phase noise characteristics. A multi-level signal transmission by a photonics-based 1-THz radio transmitter is also evaluated with QPSK and 16QAM signals designed for uplink in the LTE mobile communications.
An optoelectronic oscillator (OEO) based on bilateral coupling between two individual optoelectronic loops is demonstrated. The resulting OEO has two modes of operation, in which the individual loops either oscillate or act as IIR filters. A Q-factor greater than 1010 at 5.8 GHz is observed.
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