Polarization Maintaining fiber - HiBi PM fiber - highly birefringent, bend insensitive polarization maintaining fiber

HB-G Polarisation Maintaining Fiber

For Fiber Optic Gyroscopes

	High polarisation extinction in coiled applications
	-55°C to +85°C in-coil operating range
	Silicone-free, mode-stripping dual coating
	80 µm OD saves space and enhances lifetime

With service-environments ranging from the Arctic through to the desert and even into outer-space, all of the components of a high-grade FOG must continue to deliver their best performance over the broadest possible temperature range.

HB-G has a unique, dual-layer, acrylate coating which provides all the low-temperature performance of a conventional, silicone-rubber coating – plus, the additional benefits of optical mode-stripping and total freedom from ‘crumbing’ during mechanical removal. Test coils have demonstrated extinction ratio of better than -27 dB over the entire temperature range of -55°C to +85°C.

$typical refractive index$

Extinction ratio temperature response of a 200m, thread-wound HB800G coil

Thanks to the enhanced, static fatigue resistance, instrinsic to 80 µm fibers, HB-G can demonstrate a theoretical ten thousand fold improvement in lifetime over comparable 125 µm fibers.

$typical refractive index$

Theoretical, in-coil lifetime comparison between 80 µm and 125 µm fibers

Specifications

	HB800G	HB1250G	HB1500G
Design Wavelength¹	830 nm	1300 nm	1550 nm
Cut-off Wavelength	680 nm – 780 nm	1030 nm – 1270 nm	1230 nm – 1520 nm
Numerical Aperture	0.14 – 0.18
Mode Field Diameter²	4.2 µm	6.6 µm	7.9 µm
Attenuation³	<5 dB/km	<2 dB/km	<2 dB/km
Beat-Length⁴	<1.5 mm
Proof Test	1.0% (100 kpsi) or 2.0% (200 kpsi) to special order
Outside Diameter (Fiber)	80 ± 1 µm
Core Cladding Concentricity	<1.0 µm or 0.5 µm
Coating Type	Dual-layer, UV Cured Acrylate
Outside Diameter (Coating)	Coating packages available from 135 µm to 175 µm (nominal)

1. The Design Wavelength is the wavelength (or wavelengths) at which the fiber is typically used. In practice, the fiber will transmit the TEM₀₀ mode at wavelengths of up to approximately 200 nm longer than the cut-off wavelength.
2. The Mode Field Diameter is a nominal, calculated value, estimated at the operating wavelength(s) using typical value of numerical aperture and cut-off wavelength.
3. Attenuation is a worst-case value, quoted for the shortest design wavelength.
4. Beat Length is measured at 633 nm for all HB fiber types. To a first approximation, beat-length scales directly with operating wavelength.

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Fibercore Limited's HiBi PM fiber - highly birefringent, bend insensitive polarization maintaining fiber - is fabricated using bow tie shaped stress applying parts (SAPs). HB-G has become the choice polarization maintaining gyroscope fiber and has an 80 micron reduced clad.

Fibercore Limited, Fibercore House, University Parkway, Chilworth Science Park, Southampton, Hampshire, SO16 7QQ, United Kingdom
Tel: +44 (0)23 8076 9893 | Fax: +44 (0)23 8076 9895 | Email: info@fibercore.com