Arbitrary and endless polarization controller and...

Optics: measuring and testing – By polarized light examination – With birefringent element

Reexamination Certificate

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Reexamination Certificate

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07443504

ABSTRACT:
A polarization controller is configured to comprise polarization state monitoring section for monitoring polarization states of input light and output light of a variable polarization light element; and a control section, when the positions on a Poincare sphere expressing each of the polarization states monitored by the polarization state monitoring section are at the positions being symmetric or approximately symmetric for the equator of the Poincare sphere, for rotating the Poincare sphere by π by using the earth axis of the Poincare sphere as a rotation axis by changing the azimuth of the optical axis of the variable polarization light element, and also for inverting the changing direction of the phase shift amount. By this, arbitrary and endless control of polarization light can be realized by a phase shift amount being less than the wavelength λ of the input light.

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F. Heismann, et al., “Fast Automatic Polarization Control System”, IEEE Photonics Technology Letters, vol. 4, No. 5, pp. 503-505, May 1992.

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