Tyco Telecommunications (us) Inc.

Tyco Electronics Subsea Communications LLC

R Brian Jander

Hongbin Zhang

Morten Nissov

Georg Heinrich Mohs

Franklin Webb Kerfoot, Iii

Stuart M Abbott

Thomas R Lawrence

Alexei N Pilipetskii

Li Liu

A system and method for loading unutilized channels of a WDM system with noise to improve system performance. A transmitter amplifier may impart noise to unutilized channels by reducing amplifier input or providing feedback of the amplifier output. Noise signals may also be looped back to the transmitter from received signals.

Optical fiber transmission system with noise loading

Methods and apparatus of performing polarization control for optical transmissions. The methods and apparatus enable polarization control devices to achieve a desired output state of polarization regardless of the input state of polarization. The desired state of polarization can be achieved by rotating waveplates in a polarization controller in a sequential fashion. Each waveplate may be continually adjusted or dithered so long as the feedback signal satisfies a feedback condition. Once the feedback signal exceeds the feedback condition, the next waveplate in the polarization controller is adjusted. This enables the methods and apparatus to rapidly adjust the state of polarization away from dead spots and minimize loss control problems.

Methods and apparatus for polarization control

Embodiments of an apparatus for forming a WDM signal having orthogonally polarized optical channels are disclosed. Utilizing the optical channels formed using non-polarization-maintaining components, the apparatus selectively controls a state of polarization (SOP) of each optical channel.

Apparatus for forming a WDM signal having orthogonally polarized optical channels

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Freehold, NJ, United States of America

R Brian Jander