Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2005-12-13
2005-12-13
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
With optical coupler
Switch
C385S024000, C385S033000, C398S167000
Reexamination Certificate
active
06975785
ABSTRACT:
A free space optical switch that uses both an open loop control mode and a closed loop control mode. The open loop control mode is used to transition to a state where at least some light is sensed at a destination port. A closed loop control mode is then used, whereby a series of controlled dither signals are adjusted for system dynamics. Modifying the dither signals in this matter allows moving actuators at a rate that is much closer to the natural frequency of the underlying system, and hence speeds up the system convergence process. Variable modulation amplitudes may be employed on the dither signals to maximize convergence speed. In particular, changes in the dither signal can be made in accordance with the change in amplitude as a function of a gradient along a parabola that models the optical system response. According to still further aspects, the dither signals may be compensated for a desired and selectable attenuation level of output optical power.
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Ghandi Kamyar
Glenn Timothy Scott
Hagood, IV Nesbitt Ward
Continuum Photonics. Inc.
Hamilton Brook Smith & Reynolds P.C.
Ullah Akm Enayet
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