Phase noise cancellation in polarisation-maintaining fibre links

Passive phase noise cancellation scheme.

We introduce a new method for reducing phase noise in oscillators, thereby improving their frequency precision. The noise reduction is realized by a passive device consisting of a pair of coupled nonlinear resonating elements that are driven parametrically by the output of a conventional oscillator at a frequency close to the sum of the linear mode frequencies. Above the threshold for parametri...

Tunable polarisation-maintaining filter based on liquid crystal photonic bandgap fibre

Phase Noise Influence in Optical OFDM Systems employing RF Pilot Tone for Phase Noise Cancellation

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Effect of Underwater Ambient Noise on Quadraphase Phase-shift Keying Acoustic Sensor Network Links in Extremely Low Frequency Band

This study evaluates the impact of underwater ambient noise using seven real noise samples; Dolphin, Rain, Ferry, Sonar, Bubbles, Lightning, and Outboard Motor in three frequency ranges in extremely low frequency (ELF) band. The ELF band is the most significant bandwidth for underwater long-range communication. ELF band which is extended from 3 to 3000 Hz clearly, faces bandwidth limitation. Me...

Explanation of Polarisation Dependence of Differential Phase Shift in Two-mode Elliptic-core Fibre Strain Gauges

An appropriate elliptic-core fibre theory is applied to model the differential phase shift between the firstand secondorder modes observed in recent experiments on two-mode elliptic-core fibres subjected to longitudinal strains. The theory provides an explanation of the polarisation dependence of the stretching SI2i, required to produce a 2n differential phase shift between the two modes as a f...