Optical taps formed using fiber gratings

Details Optical taps formed using fiber gratings Optical taps formed using fiber gratings

2005-03-08

2005-03-08

Kang, Juliana K. (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C356S364000

Reexamination Certificate

active

06865320

ABSTRACT:
A matched pair of tilted gratings may be formed in a section of optical fiber (or waveguide) and used as a “tap” to measure the power of an optical signal passing through the fiber. By using a pair of highly-tilted gratings (e.g., tilted at an angle of 45° with respect to the optical axis) and orienting the gratings to be orthogonal with respect to one another (i.e., azimuthal orthogonality around the fiber axis), a pair of orthogonally polarized beams will be out-coupled from the propagating signal. Since the pair of beams are orthogonal, their sum can be made insensitive to variations in polarization of the optical signal propagating along the fiber.

REFERENCES:
patent: 5061032 (1991-10-01), Meltz et al.
patent: 5832156 (1998-11-01), Strasser et al.
patent: 5982962 (1999-11-01), Koops et al.
patent: 6069985 (2000-05-01), Albin et al.
patent: 6198557 (2001-03-01), Dultz et al.
patent: 6211957 (2001-04-01), Erdogan et al.

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