Source: http://proxy.osapublishing.org/ol/abstract.cfm?uri=ol-39-2-295
Timestamp: 2019-04-23 16:57:43+00:00

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Hollow-core–photonic-bandgap fiber, fabricated from high-purity synthetic silica, with a wide operating bandwidth between 3.1 and 3.7 μm, is reported. A minimum attenuation of 0.13 dB/m is achieved through a 19-cell core design with a thin core wall surround. The loss is reduced further to 0.05 dB/m following a purging process to remove hydrogen chloride gas from the fiber—representing more than an order of magnitude loss reduction as compared to previously reported bandgap-guiding fibers operating in the mid-infrared. The fiber also offers a low bend sensitivity of <0.25 dB per 5 cm diameter turn over a 300 nm bandwidth. Simulations are in good agreement with the achieved losses and indicate that a further loss reduction of more than a factor of 2 should be possible by enlarging the core using a 37-cell design.
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Fig. 1. (a) SEM of fabricated fiber. (b) Transmission through 5 m (purple line) and 58 m (red line) and corresponding attenuation calculated from cutback measurement (black line).
Fig. 2. (a) HCl absorption spectrum taken from HITRAN database. (b) High-resolution attenuation measurements (0.2 nm) measured by cutback technique before and after purging the HC-PBGF with argon for five days (red and green lines, respectively). Cutback lengths were from 53 to 5 m and 48 to 5 m, respectively.
Fig. 3. Bend loss: transmission of 5 m of the HC-PBGF was recorded with five coils of 5 cm diameter in the fiber (red line) and with the fiber loosely coiled (purple line). The bend loss per turn (blue line) is <0.25 dB over a 300 nm bandwidth.
Fig. 4. (a) Transmission through 10 m of HC-PBGF recorded using a commercial supercontinuum source; the mode image shown in the inset was recorded at ∼1.1 μm. (b) Attenuation of the HC-PBGF in the near-IR calculated by cutback to 5 m length. Blacked out regions correspond to effectively zero transmission.
Fig. 5. (a) Simulated attenuation (blue line) is in good agreement with measured attenuation before and after purging (black and green lines with 5 and 0.2 nm resolution, respectively). (b) Breakdown of loss contribution; simulated confinement loss (purple line) is compared to total simulated loss (red line).

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