Open-Loop Wide-Bandwidth Phase Modulation Techniques

Wide bandwidth modulation techniques for laser diodes and current noise investigations of laser diode drivers

We report on methods for widening modulation bandwidths of commercial laser diode drivers Inexpensive commercial laser diode drivers have many important characteristics but unfortunately their modulation bandwidths are often restricted to below kHz Here techniques involving p channel and n channel JFETs have been tested to enhance the modulation bandwidth of drivers suitable for common laser an...

Triangular phase-modulation approach to an open-loop fiber-optic gyroscope.

A new approach to an open-loop, all-fiber gyroscope with a wide dynamic range and a linear scale factor is described. For signal processing, the Sagnac phase shift is converted into a phase shift in the low-frequency electrical signal by using a triangular phase-modulation waveform followed by gate switching. The basic principle of this technique and experimental results are reported.

Advanced Synchronization Techniques for Continuous Phase Modulation

To my parents, Chongding Zhao and Fulan Yin, and my wife, Dawei. iii ACKNOWLEDGEMENTS This thesis is dedicated to my parents, Chongdoing Zhao and Fulan Yin, and my dear wife, Dawei, for their patience and love through all these years. My parents did their best since my childhood to provide me the best educational opportunities. They have been a source of incessant support and encouragement in m...

Low phase noise, high bandwidth frequency synthesis techniques

A quantization noise reduction technique is proposed that allows fractional-N frequency synthesizers to achieve high closed loop bandwidth and low output phase noise simultaneously. Quantization induced phase noise is the bottleneck in state-ofthe-art synthesizer design, and results in a noise-bandwidth tradeoff that typically limits closed loop synthesizer bandwidths to be <100kHz for adequate...

Ccsds - Sfcg Efficient Modulation Methods Study a Comparison of Modulation Schemes Phase 1: Bandwidth Utilization