| 摘要 |
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. |
