Search BYU 
Contact   |   Help
Navigation Menu

Photonics Home
Cleanroom Home
Lab Equipment...
[expand all...]

In-Fiber Devices
Optical fiber communication systems use a variety of in-line components such as modulators, attenuators, amplifiers, filters, etc. These in-line components are typically produced by coupling the light out of the optical fiber and into some bulk or integrated optical waveguide device and then back into the optical fiber. The goal of this research is to produce devices entirely within the optical fiber domain.

D-Shaped Optical Fiber
In-fiber optical devices require access of the light guided in the core of the optical fiber.

D-shaped optical fibers have a 'D' shape with the core close to the flat surface.

The top of the core is approximately 10 microns from the surface.

The D-shaped fibers that we use are manufactured by KVH Industries. They are polarization mantaining fibers with an elliptical core. The elliptical core can have an orientation with the major axis either parallel or perpendicular to the flat surface of the fiber.

Device Operation
The glass used in optical fibers is fairly insensitive to external signals. This insensitivity is desireable when the fiber is used as a transmission medium. Since it is hard to alter the light guided by the fiber, it is difficult to create active components such as modulators, tunable filters, etc. or create optical sensors.

In our research we have developed a method to replace a section of the optical fiber core with a different material. The new material could be a material with higher optical nonlinearites such as an electro-optic polymer or it could be a material sensitive to a particular chemical.

Fabrication Process
(Click on the process step for more detail.)
1. Remove the cladding and part of the core out of a section of D-fiber.
2. Deposit material into the groove.
3. Create additional structures and/or features.
Maintained by ECEn IMMERSE Web Team.
Copyright © 1994-2009. Brigham Young University. All Rights Reserved.