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A Simple, Linearized, Phase-Modulated Analog Optical Transmission System

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2 Author(s)
Haas, B.M. ; Lab. for Phys. Sci., College Park, MD ; Murphy, T.E.

We describe and experimentally demonstrate a new technique to suppress third-order intermodulation distortion (IMD) in a coherent phase-modulated RF optical link. The anisotropic electrooptic coefficient of lithium niobate is exploited to simultaneously modulate orthogonally polarized fields. These fields are then combined to eliminate the third-order distortion. This technique uses a single phase modulator, requiring no external bias or control, for a highly linear photonic microwave relay. The resulting suboctave dynamic range is limited by fifth-order IMD instead of third-order IMD

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 10 )