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Physics Letters A

Bistability in the frequency response of a driven SQUID ring-radio frequency resonator system

R. Whiteman, J. Diggins, Volker Schöllmann, G. Buckling, Terrence D. Clark, Robert J. Prance, Helen Prance, Jason F. Ralph, A. Widom

Published Feb 1, 1997• 4 citations
Publisher
DOI
10.1016/s0375-9601(96)00945-0

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Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University•Jan 1, 2008•0 citations
In this paper we consider new and remarkable dynamical behavior displayed by a strongly hysteretic SQUID (Superconducting QUantum Interference device)-a single Josephson weak link enclosed by a thick superconducting ring inductively coupled to a radio frequency (rf) parallel LC tank circuit resonator. Experimentally, we show that in the strongly hysteretic regime this coupled system can display remarkable level structure in its dynamics, quite different to that normally associated with rf driven SQUID ring systems. We demonstrate theoretically that this level structure arises when the SQUID ring responds non-adiabatically to time dependent changes in its potential, i.e. so that the ring no longer stays at or very close to the minimum in this potential as it changes in time.
Traditional frequency domain optical bistability(FDOB) devices with hybrid electro-optical feedback have low response speed and high noise fluctuations.Hence,a novel tunable laser FDOB device with an all-optical feedback was developed using a nonlinear fiber ring resonator as the frequency feedback element.Parametric equations of optical bistability were established according to the system's response to nonlinear process and frequency-dependent feedback.Based on the parametric equations,the characteristics and controllable operations of FDOB were analyzed.The switching response speed of the optical bistability was discussed.The analysis showed that the proposed all-fiber laser bistability device can effectively achieve intensity-driven and gain-driven optical bistability.The position and shape of the bistability hysteresis curve vary with the adjustment of gain or loss in the fiber ring resonator,hence realizing the controlled all-optical bistability operations.Sudden jumping of optical bistability in the frequency domain can be applied to monitor laser wavelength shift and achieve sensoring.The optical bistability response time is in the nanosecond order of magnitude and bistability switching is ultrafast.