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AssigneeFurukawa Electric Co., Ltd.
InventorsToshiya Hikami, Shoichi Negami, Shigeaki Nishikawa, Matsue Murata
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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 modualted 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 is provided, said second optical analyzer 3b and said third optical analyzer 3c forming an angle of 49.degree. therebetween.
A method for receiving light with a modulated polarization comprising steps of dividing the light being propagated through an optical fiber (1) with a polarization calculated 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 the second and third optical analyzers (3b and 3c) without passing through any .pi./2 phase correctors (2) before in order to receive light with a modulated intensity from the optical analyzers (3a, 3b and 3c).
An apparatus for receiving light with a modulated polarization comprising a light receiving 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, 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 (3a) forming an angle of 45.degree. therebetween, said second optical analyzer (3b) and said third optical analyzer (3c) forming an angle of 45.degree. therebetween.
Dependencies are inferred from the claim text.