Lucent Technologies Inc.

Fitel USA Corporation

Lothar Benedict Moeller

Paul S Westbrook

Herwig Werner Kogelnik

A method and apparatus for polarization measurements. A polarization state of an optical signal can be determined using a polarization analyzer comprising a polarization controller, a polarizer, a wavelength dispersive element and a photo-detector. The method and apparatus can be applied to polarization and polarization mode dispersion measurements in wavelength division multiplexed communication systems.

Method and apparatus for polarization measurements

An integrated broadband polarization controller is based on planar waveguide technology. The integrated broadband polarization controller emulates the polarization control function of an existing single channel polarization controller in a device that can be built in planar waveguide technology, and is expanded from single channel operation to broadband channel operation by designing the control degrees of freedom to be wavelength selectively addressable.

Method and apparatus for providing integrated broadband polarization control

A method and apparatus for measuring polarization mode dispersion in a transmission system. The method allows polarization mode dispersion to be measured concurrent with data transmission in the transmission system.

Method and apparatus for on-line monitoring of polarization mode dispersion in a transmission system

A polarization mode dispersion (PMD) emulator may include one or more modular &ldquo;cells&rdquo; that emulate PMD. Each of the cells may include optical delay and phase modulation components. The optical delay and/or the phase modulation components may be adjusted to account for differences in PMD and two or more of the cells may be combined to further adjust the overall PMD of the apparatus. Similarly, a PMD compensator may include one or more modular &ldquo;cells&rdquo; that compensate for PMD, with each of the cells including optical delay and phase modulation components. The optical delay and/or the phase modulation components may be adjusted to compensate for various PMD values and two or more of the cells may be combined to further adjust the overall PMD compensation of the apparatus. The PMD compensator apparatus may be used to compensate for PMD in wideband applications, such as wavelength division multiplexed (WDM) systems.

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Hazlet, NJ, United States of America

Lothar Benedict Moeller