Independent control of one of normally interdependent light tran

Details Independent control of one of normally interdependent light tran Independent control of one of normally interdependent light tran

1997-08-12

1999-05-11

Ngo, Hung N.

Optical waveguides

Polarization without modulation

385 1, 385147, G02B6/10

Patent

active

059036842

ABSTRACT:
A method and apparatus for controlling polarization, as one of a pair of erdependent light characteristics of an optical fiber, in response to a time dependent signal without the introduction of any significant variation in phase delay. A pair of transducers compress the optical fiber at spaced locations. When phase of energization of a first transducer in response to the time dependent signal is 180.degree. out-of-phase with the energization of the second transducer, the polarization shifts in response to the time dependent signal without any significant shift is phase delay. When the phases are in-phase, phase delay shifts in response to the time dependent signal without any significant shift in polarization. Multiple sets of transducers disposed along the optical fiber enable smooth variation of the controlled polarization or phase delay when a first transducer in each set is angularly displaced about the optical fiber by 45.degree. with respect to a first transducer in an adjacent set.

REFERENCES:
patent: 4753507 (1988-06-01), DePaula et al.
patent: 4768851 (1988-09-01), Shaw et al.
patent: 5191387 (1993-03-01), Ichikawa et al.
patent: 5245400 (1993-09-01), AnJan et al.
patent: 5561726 (1996-10-01), Yao

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