Laser and fiber coupling control

Details Laser and fiber coupling control Laser and fiber coupling control

2008-03-18

2008-03-18

Lavarias, Arnel (Department: 2872)

Optical: systems and elements

Deflection using a moving element

By moving a reflective element

C385S018000, C250S201100

Reexamination Certificate

active

10874978

ABSTRACT:
One or more single mode waveguide devices are fiber coupled such that signals to an optical element affect the coupling of the waveguide device to an optical fiber. A number of systems and methods are disclosed to adjust the coupling of the waveguide device to the optical fiber. These include dithering the tunable optical element at different frequencies along differing axes and using a lock-in technique to derive an error signal for each degree of motion, using a beamsplitter to form a secondary image of the focused beam on a position-sensitive detector, the use of a chiseled fiber to generate reflections from the angled facets, using an additional laser for a secondary image, or obtaining a secondary image from an angled fiber or a parasitic reflection.

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