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The last few years have seen a wealth of new nonlinear propagation modeling results appear in the literature, especially regarding coherent systems operating in the absence of optical dispersion compensation. One of the most prolific lines of research, though not the only one, has been that of improvements and upgrades to the Gaussian-noise (GN) model, which have also led to the so-called enhanced...
We apply DBP to an experimental WDM system where multisubcarrier transmission provides a 12% reach gain vs. single-carrier. DBP provides further gain for both single- and multisubcarrier systems but significantly underperforms ideal theoretical predictions.
We find evidence that low-OSNR operation causes substantial penalty on the system maximum reach due to non-linearity generated by ASE noise and due to signal-power conversion into non-linear noise. Neglecting these effects may lead to quite substantial performance prediction error.
Dispersion pre-compensation is shown to potentially lead to a substantial non-linearity reduction in PM-QPSK links that use a mixture of high and low dispersion fibers. However, the much larger PAPR of the pre-compensated signal poses challenging requirements on the transmitter.
Absolute phase noise < −100 dBc/Hz at 1 Hz offset from a 10 GHz carrier is demonstrated by using an Er:fiber frequency comb to frequency-divide a narrow linewidth CW laser.
An optical frequency comb locked to a stable optical reference can serve as a source for microwave signals having very low close-to-carrier phase noise. This has recently been confirmed by comparing two independent systems, yielding an absolute phase noise of −104 dBc/Hz at 1 Hz offset from a 10 GHz carrier. The corresponding timing jitter is 760 attoseconds, integrated from 1 Hz to 1 MHz. Here we...
We demonstrate a 10 GHz photonic oscillator based on optical frequency division of a high-stability optical reference with a modelocked fs laser. Characterization with a second independent photonic oscillator reveals a close-to-carrier phase noise that is < 100 dBc/Hz, reducing to a shot noise floor of −156 dBc/Hz at a 1MHz offset.
An optically-stabilized femtosecond laser optical frequency comb can serve as a source of optical and microwave waveforms with absolute integrated timing jitter on the scale of a few femtoseconds. This ultralow jitter is due to the stability of a passive optical cavity, which is the frequency reference for the system. We will present recent results in the generation of low phase noise 10 GHz signals...
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