2. Bragg gratings in guided optics
2.1 Notion of mode coupling
When we consider an ideal optical fiber, light propagates in different orthogonal modes, and there can be no direct coupling of energy between them: these are the guide's "proper" modes. On the other hand, in a real fiber, intermodal coupling can occur because no fiber, due to technological manufacturing constraints, has a perfectly cylindrical geometry, nor a refractive index that is completely constant longitudinally. In this case, the coupling is "assisted" by disturbances in the guide: fluctuations in index, diameter, etc. However, as we shall see, it is precisely a longitudinal variation in refractive index that is used in a controlled and periodic way to obtain a Bragg grating.
In any unimodal fiber, the coupling of part of...
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
Bragg gratings in guided optics
Conclusion and outlook
Article included in this offer
"Mechanical and dimensional measurements"
(
124 articles
)
Updated and enriched with articles validated by our scientific committees
A set of exclusive tools to complement the resources
Bibliography
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
