G - Physics – 02 – B
Patent
G - Physics
02
B
73/53
G02B 6/10 (2006.01) G01R 23/17 (2006.01) G02F 1/225 (2006.01)
Patent
CA 1308936
OPTICAL FIBRE INTERFEROMETER Abstract Of The Invention An optical fibre interferometer particularly adapted to provide a light output that is modulated in relation to the intensity of an electromagnetic field includes a single-mode fibre of substantially non-electrooptic material (20, 22 and 24) to which has been spliced (at 26 and 28) a single-mode fibre of substantially electrooptic material (30). When the interferometer is placed in an electromagnetic field, the optical characteristics of the substantially electrooptic fibre are varied, but the optical characteristics of the substantially non-electrooptic fibre are not. As a result, the light passing through the substantially non-electrooptic and electrooptic fibres undergoes a differential phase shift, causing interference upon light recombination that provides the desired light output modulation. Embodiments in which the fibre of substantiallyelectrooptic material is replaced by an optical waveguide of substantially electrooptic material, either formed separately (50, FIGURE 3) or directly (70, FIGURE 4) on the optical fibre itself, are discussed, as is the broad applicability of the interferometer to any situation in which an external parameter is to be measured.
549058
Mpr Teltech Ltd.
Smart & Biggar
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