Highly index-sensitive optical devices including long period...

Details Highly index-sensitive optical devices including long period... Highly index-sensitive optical devices including long period...

2005-09-27

2005-09-27

Ullah, Akm Enayet (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S039000

Reexamination Certificate

active

06950578

ABSTRACT:
A long period fiber grating (LPG) device is formed to exhibit a “turn-around-point” (TAP) in a phase matching curve when the group velocities of two propagating modes are matched. When the grating period of the LPG is selected to coincide with the TAP, a large tuning bandwidth is formed. This device has been found to be highly sensitive to changes in the refractive index of the ambient surrounding the LPG (recognizing a change in refractive index as low as 10−4), allowing the device to be used as a sensor for trace elements in the atmosphere. The ability of the TAP LPG to modify the intensity of a propagating optical signal as a function of changes in the refractive dielectric of a surround material also allows for this device to be used as an all-fiber high speed optical signal modulator.

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