Photonics Research Ontario

Fibos Inc.

Xijia Gu

Michael Bakaic

Nicholas Burgwin

Robin Chi-Hung Tam

The optical sensor generally has a frame having a deformable member mounted to the frame, and a sensing optical fiber being fixedly attached to a portion of the deformable member, the sensing optical fiber having at least one &#x3c0;-phase-shifted fiber Bragg grating inscribed thereon, the at least one &#x3c0;-phase-shifted fiber Bragg grating of the sensing optical fiber deforming together with the deformable member when the frame is subjected to a force.

Optical sensor having &#x3c0;-phase shifted Bragg grating and optical sensing system using same

Optical fiber diffusers for emitting light cylindrically along a length of the fiber diffuser with preselected light intensity distributions along the length of the diffuser. The diffuser portion is defined by forming a Bragg grating in a section of the optical fiber core having a modulated index of refraction which acts to couple light radially out of the fiber along the diffuser section. The intensity distribution of light coupled out of the diffuser section of the fiber is controlled by controlling the profile of the modulated index of refraction, namely the coupling coefficient, along the length of the grating. For photodynamic therapy type II strong Bragg gratings are preferred which give higher intensity output over short distances. Multiple Bragg gratings can be written into a multimode fiber for emission of light at several positions along the fiber. Writing a Bragg grating into a multimode fiber provides a method of monitoring transmission in the fiber since some of the light can be coupled out and detected and interrogated. The diffuser device can be used as sensors since they also couple light incident on the diffuser into the core where it is transmitted to a detector.

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Toronto, Canada

Xijia Gu