H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/06 (2006.01) G02B 6/34 (2006.01)
Patent
CA 2137327
There is provided a method for modulating the polarization of light that allows detection of any modulated output regardless if the optical analyzers are rigidly held in place. According to a first aspect of the invention, a method for receiving light with a modulated polarization comprises steps of dividing the light being propagated through an optical fiber 1 with a polarization modulated in accordance with a modulation signal into three branched beams, causing one of the branched beams of light with a modulated polarization to pass through a .pi./2 phase corrector 2 and a first optical analyzer 3a and causing the remaining branched beams of light to respectively pass through second and third optical analyzers 3b and 3c without passing through any .pi./2 phase correctors before in order to receive light with a modulated intensity from the optical analyzers 3a, 3b and 3c. According to a second aspect of the invention, an apparatus for receiving light with a modulated plane of polarization comprises a branch section 4 including branching devices 5a and 5b for dividing the light with a modulated polarization being propagated through an optical fiber 1 into three branched beams of light 6a, 6b and 6c, a .pi./2 phase corrector 2 arranged on one of the path of one of the three branched beams of light, for instance 6a, an optical analyzer 3a arranged downstream to the .pi./2 phase corrector 2, a pair of optical analyzers 3b and 3c arranged on the respective paths of the remaining branched beams of light 6b and 6c, said .pi./2 phase corrector 2 and said first optical analyzer forming an angle of 45' therebetween, said second optical analyzer 3b and said third optical analyzer 3c forming an angle of 45' therebetween.
Hikami Toshiya
Murata Matsue
Negami Shoichi
Nishikawa Shigeaki
Ridout & Maybee Llp
The Furukawa Electric Co. Ltd.
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