Fiber devices and sensors based on multimode fiber Bragg grating

Details Fiber devices and sensors based on multimode fiber Bragg grating Fiber devices and sensors based on multimode fiber Bragg grating

1995-09-08

1998-12-08

Bovernick, Rodney B.

Optical waveguides

Optical waveguide sensor

385 13, G02B 600

Patent

active

058482040

ABSTRACT:
New sensing and diagnostic methods are implemented with multimode fiber Bragg gratings (MMFBG) and methods for sensor addressing and multiplexing are described. Real time structural strain and vibration monitoring using optical time domain reflectometry (OTDR) is discussed. The first all-mode, wave optics calculations of the reflectivity of Bragg gratings in highly multimode optical fibers are presented, including the effects of individual mode power changes due to microbending transducer loss upstream from the grating. Two categories of multimode fiber gratings are possible, independent mode and mode coupling, and the fabrication differences between these types of gratings are described. The reflectivity properties of independent mode multimode fiber gratings are examined and compared to single mode fiber gratings. In particular, multimode fiber gratings offer added flexibility in grating design and performance characteristics compared to single mode fiber gratings, because the reflectivity response may be tuned by the spatial periodicity, length, core size, numerical aperture, and mode coupling characteristics of the grating.

REFERENCES:
patent: 4268116 (1981-05-01), Schmadel et al.
patent: 4400056 (1983-08-01), Cielo
patent: 4806012 (1989-02-01), Meltz et al.
patent: 4807950 (1989-02-01), Glenn et al.
patent: 4815843 (1989-03-01), Tiefenthaler et al.
patent: 4911516 (1990-03-01), Palfrey et al.
patent: 4920261 (1990-04-01), Bock et al.
patent: 5187760 (1993-02-01), Huber
patent: 5206924 (1993-04-01), Kersey
patent: 5218651 (1993-06-01), Faco et al.
patent: 5280172 (1994-01-01), Di Bin et al.
patent: 5290103 (1994-03-01), Fevrier et al.
patent: 5305335 (1994-04-01), Ball et al.
patent: 5307437 (1994-04-01), Facq et al.
patent: 5532864 (1996-07-01), Alexander et al.
patent: 5563967 (1996-10-01), Haake
patent: 5564832 (1996-10-01), Ball et al.

Affiliated with

Also associated with

Rating

Fiber devices and sensors based on multimode fiber Bragg grating does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fiber devices and sensors based on multimode fiber Bragg grating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber devices and sensors based on multimode fiber Bragg grating will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-187052