Elanor Harriet Huntington

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—This brief introduces a delayed differential feedback chaos generator with a programmable feedback element. The pro-grammable feedback allows us to implement an arbitrary nonlin-earity or modulate the feedback delay time. Delayed differential feedback systems have been suggested for secure communications, and the flexibility of the programmable system is(More)
Tracking a randomly varying optical phase is a key task in metrology, with applications in optical communication. The best precision for optical-phase tracking has until now been limited by the quantum vacuum fluctuations of coherent light. Here, we surpass this coherent-state limit by using a continuous-wave beam in a phase-squeezed quantum state. Unlike(More)
— This work presents a robust approach to estimate the continuously varying phase of an optical system. Here we extend the adaptive homodyne estimator scheme by using a nonlinear guaranteed cost robust filter in the feedback loop to improve the estimator performance. The nonlinear robust filter is designed by using a copy of the sector bounded nonlinear(More)
We present a method for synchronization of chaos generators based on transmission of an analog chaotic waveform in a digital form. Experimental comparisons between digital and analog transmission of chaos from a delayed differential feedback system are performed. Synchronization is demonstrated to be between 18 and 39 dB (or equivalently 63 to 7943 times)(More)
We describe and experimentally demonstrate a method for active control of resonant modulators and filters in an integrated photonics platform. Variations in resonance frequency due to manufacturing processes and thermal fluctuations are corrected by way of balanced homodyne locking. The method is compact, insensitive to intensity fluctuations, minimally(More)
Precise knowledge of an optical device's frequency response is crucial for it to be useful in most applications. Traditional methods for determining the frequency response of an optical system (e.g. optical cavity or waveguide modulator) usually rely on calibrated broadband photo-detectors or complicated RF mixdown operations. As the bandwidths of these(More)
Frequency locking of an optical cavity using a time-varying kalman filtering approach, " IEEE Trans. Control Syst. Tech., 2013. In print. [2] S. Z. Sayed Hassen, " A robust approach to the load frequency control problem with speed regulation uncertainty, " Int. Optimal frequency regulation of a two-area power system, " in IEEE Inter. A time-varying Kalman(More)
  • Abhijit G Kallapur, Toby K Boyson, Ian R Petersen, Charles C Harb, C B A C Paldus, T G Harb +43 others
  • 2011
This paper discusses the application of a discrete-time extended Kalman filter (EKF) to the problem of estimating the decay time constant for a Fabry-Perot optical cavity for cavity ring-down spectroscopy (CRDS). The data for the estimation process is obtained from a CRDS experimental setup in terms of the light intensity at the output of the cavity. The(More)
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