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Active polarization coupler for birefringent fiber

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Abstract

Static coupling between polarization modes achieved by periodically stressing birefringent fiber once per beat length was recently reported. The same scheme is now used to obtain coupling modulation at kilohertz-to-megahertz frequencies by applying pressure to the fiber with an oscillating piezoelectric ceramic. An amplitude of 30–50 V (peak to peak) was found to be necessary to modulate the polarization coupling from a minimum to a maximum. Polarization modulation is also achieved by applying stress along one fiber polarization axis between the two static couplers of a Mach–Zehnder interferometer.

© 1984 Optical Society of America

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