H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/18 (2006.01) G02B 6/12 (2006.01) G02F 1/125 (2006.01) G03B 21/00 (2006.01) H04B 10/135 (2006.01) H04B 10/17 (2006.01) H04R 23/00 (2006.01)
Patent
CA 2257058
An apparatus and method for reducing polarization hole buming in a rare-earth-doped fiber amplifier within an optical communication system by converting an optical carrier having a characteristic wavelength into a polarization-rotating optical carrier is disclosed. The apparatus includes a polarization-fixing device optically coupled in the optical transmission system to transform the optical carrier to a polarized optical carrier, and an acousto-optic modulator positioned to receive a first portion of the polarized optical carrier and to orthogonally convert the polarization of the polarized optical carrier and to shift the polarized optical carrier by a modulation frequency. The apparatus and method further includes a polarization beam combiner optically coupled to receive the orthogonally polarization converted and frequency shifted polarized signal and a portion of the original polarized optical carrier. The polarization beam combiner produces a polarization-rotating carrier signal that is transmitted downstream in the optical communication system to a rare-earth-doped fiber amplifier.
Bentivoglio Ravasio Filippo
Frascolla Massimo
Ottolenghi Paolo
Schmid Steffen
Kirby Eades Gale Baker
Pirelli Cavi E. Sistemi S.p.a.
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