G - Physics – 01 – C
Patent
G - Physics
01
C
88/99
G01C 19/64 (2006.01) G01C 19/72 (2006.01) G02F 1/01 (2006.01)
Patent
CA 1249743
FIBER OPTIC FREQUENCY SHIFTER Abstract of the Disclosure This invention relates to fiber optic frequency shifters for producing optical signals of a desired frequency range for input to a device such as an optical rotation sensing system. The rotating birefringence is created in a length of fiber optic material, which has the effect of a rotating half-wave plate upon an input optical signal. The length of fiber optic material may have a jacket of either an electrostrictive or a magnetostrictive material formed thereon such that application of an appropriate field to the jacket compresses the enclosed fiber to induce birefringence therein by means of the photoelastic effect. A half-coupler having a block of electro-optically active birefringent material adjacent the interaction region combined with an electrode configuration and circuitry for producing a rotating electric field in the block also produces a rotating half-wave plate frequency shifter. The evanescent field of light propagating in the optical fiber interacts with the rotating birefringence and experiences a frequency shift. The invention also includes feedback circuitry for processing the optical output of fiber optic rotating half-wave plates to maintain the intensity of components in the output signal having the carrier frequency below a threshold value.
475915
Gowling Lafleur Henderson Llp
Litton Systems Inc.
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