Technique for reducing polarization dependent gain in an amplifi

Details Technique for reducing polarization dependent gain in an amplifi Technique for reducing polarization dependent gain in an amplifi

1993-04-13

1994-09-06

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359337, 359174, H04B 1002

Patent

active

053453310

ABSTRACT:
A technique employing a depolarized optical source to reduce the polarization dependent gain associated with the optical pump signal used to excite doped fiber amplifiers within an optical transmission system. Pumping the doped fiber amplifiers with a signal that has no single predominant linear SOP, equalizes the gain of the amplifiers. A particular embodiment of the invention includes a pump comprised of a passive polarization scrambler coupled to the output of a multifrequency optical laser. The simple, passive arrangement keeps overall system costs to a minimum and increases reliability.

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"Observation of New Polarization Dependence Effect in Long Haul Optically Amplified System" M. G. Taylor, OFC'93 Post-deadline paper, Feb. 1993, pp. 23-28.
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"Polarized Fluorescence Line Narrowing Measurements of Nd Laser Glasses: Evidence of Stimulated Emission Cross Section Anisotropy" D. W. Hall and M. J. Weber Appl. Phyl. Lett., vol. 42, No. 2, Jan. 15, 1983, pp. 157-159.

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