Form birefringent cutoff polarizer and method

Details Form birefringent cutoff polarizer and method Form birefringent cutoff polarizer and method

1985-08-22

1988-02-16

Lee, John

350 9629, 350395, 350406, G02B 530

Patent

active

047251131

ABSTRACT:
The cladding and a portion of the core of a length of optical fiber are removed to form an interaction region. A form birefringent stack is positioned on the exposed core. The refractive index of the stack for polarizations parallel to the plane of the interaction region is approximately equal to the refractive index of the fiber core so that these polarizations radiate from the fiber. The refractive index of the stack for the polarization normal to the plane fo the interaction region is approximately equal to the refractive index of the cladding so that this polarization remains guided by the fiber. A photodetector forms an error signal from the polarization radiated from the fiber, and control circuitry processes the error signal to drive a polarization controller that adjusts the polarization of light input to the polarizer to minimize the error signal.

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