Hollow-core photonic bandgap fibers use a microstructured cladding region with air holes to guide light in a hollow core. The photonic bandgap guiding mechanism is fundamentally different from the traditional total internal reflection guiding principle. This new technology provides the basis for high power delivery without nonlinear effects or material damage.
As more than 98% of the mode is confined in air, the fibers are also very radiation insensitive making them suitable for radiation hard environments.
- High threshold power for nonlinear effects
- Pure silica material
- Core can be filled with gasses, particles etc
- Extreme dispersion values for pulse compression/dispersion compensation
- No Fresnel reflections at open fiber end
Other advantages with these fibers are that they are almost entirely bend-insensitive – they may be bent down <1 cm bend diameter without any change of optical transmission.
800 / 1060 nm range:
1550 / 2000 nm range:
HC19-1550 (large 19 cell core)
|Center wavelength||440 ± 5 nm||530 ± 5 nm||~ 580 nm|
|Attenuation @ center wavelength||~1.5 dB/m||~1.2 dB/m||< 1 dB/m|
|Mode field diameter (1/e2)||4 ± 1 µm||4 ± 1 µm||5.3 ± 1 µm|
|NA @ center wavelength1||~0.2||~0.2||~ 0.2|
|Effective mode index||~0.99||~0.99||~ 0.99|
|Center wavelength||820 nm||1060 nm|
|Attenuation @ center wavelength||< 0.25 dB/m||< 0.1 dB/m|
|Bandwidth||~100 nm||~100 nm|
|Mode field diameter (1/e2)||5.5 ± 1 µm||7.5 µm ± 1 µm|
|Center wavelength||1550 nm||1550 nm||2000 nm|
|Attenuation @ center wavelength||< 30 dB/km||< 20 dB/km||< 20 dB/km|
|Bandwidth||~200 nm||~80 nm||~160 nm|
|Mode field diameter (1/e2)||9 ± 1 µm||13 ± 2 µm||~11 μm|