Plural-channel optical rotary joint

Details Plural-channel optical rotary joint Plural-channel optical rotary joint

G - Physics

02

B

88/97.5

G02B 26/02 (2006.01) G02B 6/00 (2006.01) G02B 6/35 (2006.01) G02B 6/36 (2006.01)

Patent

CA 1251970

- 13 - PLURAL-CHANNEL OPTICAL ROTARY JOINT Abstract An optical rotary joint has a first pair of light beam expanding graded index (GRIN) of refraction lenses coupled to ends of a first pair of lightguide fibers for coupling signals through the rotary joint interface in a first path which is coaxial with the axis of rotation in the interface. A second pair of lightguide fibers are coupled to a second pair of GRIN lenses off-axis and of much smaller diameter than the lenses of the first pair. Prisms couple signals between the off-axis lenses and a second path across the interface and which is also coaxial with the axis of rotation. Also shown is a method for compensating for lens irregularities.

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