Polarization-controller driving method for optical fiber...

Details Polarization-controller driving method for optical fiber... Polarization-controller driving method for optical fiber...

2011-04-05

2011-04-05

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S490020, C359S484010

Reexamination Certificate

active

07920315

ABSTRACT:
A method of piloting an optical polarization controller including a cascade of variable polarization transformers that can be driven individually to realize overall a polarization transformation between an input optical signal and an output optical signal with each transformer having predetermined maximum and minimum end driving limits. For each transformer the method includes cyclically the steps of finding an error signal output to the controller and driving a first transformer polarization variation by a predetermined amount CS in one of the two directions to check whether with this variation the error signal is reduced and, if not, driving in the opposite direction. The decision of which of the two directions to drive first is made each time and is not fixed. Equipment in accordance with the method is also described.

REFERENCES:
patent: 2003/0174400 (2003-09-01), Patel et al.
patent: 2004/0131363 (2004-07-01), Kisaka et al.
patent: 0393967 (1990-10-01), None
Gunkel, Matthias. “Reset-free Endless Polarisation Control with Finite Range Devices.” Proceedings of the SPIE—The International Society for Optical Engineering USA, 1995, vol. 2449, pp. 184-192.

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