Patent ID: 8786938

Claim:
A demodulator comprising: a first beam displacer; a second beam displacer positioned to receive an output from the first beam displacer; a third beam displacer positioned to receive an output from the second beam displacer; a first half waveplate positioned to receive an output from the third beam displacer; a fourth beam displacer positioned to receive an output from the first half waveplate; a fifth beam displacer positioned to receive an output from the fourth beam displacer; a quarter waveplate positioned between the fourth beam displacer and the fifth beam displacer; a sixth beam displacer positioned between the first half waveplate and the fourth beam displacer; a half waveplate pile positioned between the sixth beam displacer and the fourth beam displacer; a seventh beam displacer positioned between the half waveplate pile and the fourth beam displacer; and a second half waveplate positioned between the seventh beam displacer and the fourth beam displacer.