Abstract
In coherent optical transmission systems continuous or endless matching of the states of polarizations (SOPs) can be achieved by automatic control. The first working system was based on mechanical devices1. Earlier proposals for LiNbO3 exhibited a very narrow optical bandwidth2,3, required at least two devices4, or failed to demonstrate automatic operation under worst case conditions5. We present a very robust automatic polarization control system with Ti:LiNbO3 SOP transformers. The intensity losses remain below 0.12 dB even for worst case polarizations, with substantial multi-path reflexions present, and at high tracking speed.
© 1988 Optical Society of America
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