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Virtual long-period gratings
César Jáuregui1, José Miguel López-Higuera
1University of Cantabria, Grupo de Ingeniería Fotónica, Departamento Tecnología Electrónica e Ingeniería Sistemas y Automdtica, Avenida Los Castros s/n, c.p. 39005 Santander, Spain. jauregui@teisa.unican.es
Optics Letters
|January 15, 2005
Summary
A novel virtual long-period grating is theoretically proposed. This fiber optic device utilizes high-birefringence fiber twisting, with spectral response controlled by light polarization.
Area of Science:
- Photonics and Optical Engineering
- Fiber Optics
- Materials Science
Background:
- Long-period gratings (LPGs) are crucial optical fiber devices.
- Controlling LPG spectral response typically requires permanent structural modifications.
- High-birefringence (Hi-Bi) fibers offer unique polarization-dependent properties.
Purpose of the Study:
- To theoretically predict a new type of fiber grating.
- To introduce a device with polarization-tunable spectral response.
- To propose a 'virtual' grating without permanent index changes.
Main Methods:
- Theoretical modeling of light propagation in a twisted Hi-Bi fiber.
- Analysis of polarization evolution along the fiber.
- Simulation of spectral response based on polarization dynamics.
Main Results:
- A novel fiber grating structure, termed a virtual long-period grating, is predicted.
- The device exhibits LPG-like behavior.
- Spectral response is controllable via the input state of polarization.
Conclusions:
- A polarization-controlled virtual long-period grating can be realized in twisted Hi-Bi fiber.
- This device offers a dynamic spectral response without permanent fabrication.
- The proposed structure opens new avenues for tunable fiber optic devices.