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Fabrication and characterization of an all-solid 2D photonic bandgap fiber with a low-loss region (< 20 dB/km) around 1550 nm

G. Bouwmans, L. Bigot, Y. Quiquempois, F. Lopez, L. Provino, and M. Douay

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Abstract

The fabrication and characterization of an all-solid photonic bandgap fiber is reported. The fiber presents a low-loss region (< 20 dB/km) around 1550 nm and can be used as single-mode even for a fiber core diameter as large as 20 μm. The fiber presents a zero dispersion at the short wavelength edge of the bandgap. The measured polarisation mode dispersion is wavelength dependent but remains small (few ps/km1/2). This fiber opens the possibility to realize low-loss large mode area bandgap fiber with a doped core and or Bragg gratings.

©2005 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Scanning electron micrograph of the SC-PBG fiber. The bright cylinders correspond to germanium-doped regions. The fiber diameter is 300 μm for a core diameter of 20 μm and a pitch, ʌ, of 15.2 μm.

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Fig. 2.
Fig. 2. (a) Transmission spectrum of the PBG fiber shown on Fig. 1 (L= 4 m). Full curves: experimental data with 2 nm (black) and 0.05 nm (dark blue) resolution. The hatched regions represent the range of wavelength for which new modes appear in the high index inclusions (cf. Table 1). (b) Schematic representation of the set-up used for transmission measurements

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Fig. 3.
Fig. 3. Loss transmission spectrum of the 300 μm diameter fiber. The spectrum was obtained by cutting the fiber from 387 m to 10 m.

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Fig. 4.
Fig. 4. (a) Near field image of the guided mode observed at 1470 nm for a fiber length of 59.5 cm. (b) Experimental intensity profiles (black curves) along the two axes X and Y shown on Fig. 4 (a). The red curves represent a Gaussian fit of the experimental data.

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Fig. 5.
Fig. 5. GVD measured with the phase modulation method (red curve) and the low coherence interference method (blue curve) inside the fiber’s 3rd bandgap. Inset shows an example of an interference pattern observed in the case of the interference method.

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Fig. 6.
Fig. 6. (a) Result of the substraction of two transmission spectra obtained for orthogonal directions of the input polarizer (Lfiber = 347 m) and (b) the corresponding calculated group delay τ.

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Tables (1)

Tables Icon

Table 1. Mode cutoffs of the high-index inclusions of our 300 μm fiber according to the results published in [21]. Each range of wavelength for which a group of modes appears in high index inclusions has been represented by hatched areas on Fig. 2.

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