Variable polarization independent optical power splitter

Details Variable polarization independent optical power splitter Variable polarization independent optical power splitter

G - Physics

02

B

G02B 27/10 (2006.01) G02F 1/00 (2006.01)

Patent

CA 2465602

An optical power splitter for variably splitting an arbitrarily polarized light beam into two or more light beams, is disclosed. An input light beam "A" is received and split it into two output light beams "M" and "N" where the optical power ratio of the two output light beams "M" and "N" is adjusted to a desired ratio by controlling a variable polarization rotator (liquid crystal unit). The polarization components "P' and "S" of the input light beam "A" are separated in a first polarization separator (birefringent displacer), then processed through the variable polarization rotator and a second polarization separator. Finally the processed optical components are recombined in a polarization combiner so as to constitute the desired output light beams "M" and "N" having the desired optical power ratio "R". The polarization independence of the power split is thus achieved through the stratagem of processing the "P" and "S" polarized components of the input light beam "A" separately - resulting in four light beams "H, "I", "L" and "K" which appropriately combined in the polarization combiner yield the output light beams "M" and "N". A number of embodiments are disclosed with different optical technology in the second polarization separator (Wollaston prism) and the variable polarization rotator (mechanically or electro-mechanically adjusted wave plate), with optical deflection means (for physical compactness) and photo detectors (for optical power monitoring), as well as an embodiment for a four-way split.

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