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Vibration Detection and Localization using Modified Digital Coherent Telecom Transponders

Vibration Detection and Localization using Modified Digital Coherent Telecom Transponders We demonstrate a vibration detection and localization scheme based on bidirectional transmission of telecom signals with digital coherent detection at the receivers. Optical phase is extracted from the digital signal processing blocks of the coherent receiver, from which the vibration component is extracted by bandpass filtering, and the position along the cable closest to the vibration’s epicenter is recovered by correlation. We demonstrate our scheme first using offline experiment with 200-Gb/s DP-16QAM, and we report field trial results over installed fiber to detect real-world vibration events.

A Dispersion Managed Phase Only Modulation 18 GHz Optoelectronic Oscillator

A Dispersion Managed Phase Only Modulation 18 GHz Optoelectronic Oscillator n this manuscript, we propose and experimentally demonstrate a dispersion controlled optoelectronic oscillator with phase only modulator at 18 GHz. The generated microwave signal has a phase noise of −108 dBc/Hz at 10 kHz offset frequency and the integrated timing jitter is calculated to be 16.2 fs (1 kHz to 100 MHz) and 20 fs (1kHz to Nyquist).