Fiber embedded grating frequency standard optical communication

Optical waveguides – With optical coupler – Input/output coupler

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385 43, 385 24, 385140, 372 20, 108359, 359124, 359130, 359188, 359193, 359195, G02B 634, H01S 310, H04J 100

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active

050778161

ABSTRACT:
A narrowband laser source includes an optical fiber section including a core centered on a longitudinal axis and a cladding surounding the core, and having a grating region embedded in the core. The grating region includes a multitude of Bragg grating elements extending with a substantially equal longitudinal spacing substantially normal to the longitudinal axis for the grating region to significantly reduce the amount of light passing therethrough when the frequency of such light is in a predetermined narrow range around and including a predetermined center frequency, to an extent proportionate to the deviation of such frequency from the center frequency. A portion of the light emitted by a laser at a frequency dependent on the amount of electric energy applied to the laser is supplied into the core of the fiber section for propagation toward the grating region. The amount of light passing through the grating region is detected, and the amount of energy applied to the laser is varied in dependence on the extent of deviation of the frequency of such light from the center frequency in such a sense as to reduce the extent of such deviation.

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patent: 5029967 (1991-07-01), Livezey et al.
patent: 5033812 (1991-07-01), Yoshida et al.

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