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Polarization maintaining large mode area photonic crystal fiber

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Abstract

We report on a polarization maintaining large mode area photonic crystal fiber. Unlike, previous work on polarization maintaining photonic crystal fibers, birefringence is introduced using stress applying parts. This has allowed us to realize fibers, which are both single mode at any wavelength and have a practically constant birefringence for any wavelength. The fibers presented in this work have mode field diameters from about 4 to 6.5 micron, and exhibit a typical birefringence of 1.5·10-4.

©2004 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Microscope image of PM-LMA fiber.
Fig. 2.
Fig. 2. Spectral attenuation for the three fibers.
Fig. 3.
Fig. 3. Measurement set-up for group birefringence. GT1 : Input Glan-Thomson polarizer. L1 : Coupling lens into fiber under test (FUT). L2 : Collamating lens for fiber output. GT2 : Output Glan-Thomson polarizer (analyser). L3 : Focussing lens. MM : Multi-mode fiber for light collection and detection in optical spectrum analyser (OSA).
Fig. 4.
Fig. 4. Measured polarization osciallations, for the largest (left) and smallest (right) values of the relative wavelength, λ/Λ.
Fig. 5.
Fig. 5. Group birefringence vs. wavelength for the three fibers.

Equations (2)

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T = cos 2 ( Δ β L )
φ λ = 2 π L λ 2 [ λ Δ n p h λ Δ n p h ] = 2 π L λ 2 Δ n g
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