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Fiber-Optic Couplers (Hi Rel and SM) product image

High Reliability PM Fused Fibre Coupler

For PM splitting and monitoring signals in the wavelength range of 915–1600 nm in harsh environments such as undersea and space, where the costs of component replacement are prohibitive.

Full Product Description
Center wavelength:
9xx nm, 10xx nm, 1310 nm, 14xx nm, 15xx nm
Optical power handling:
4 W
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Product description

Using our proven fused biconical taper process, our HI REL capability is built upon the foundation of the long-established manufacturing history of very reliable terrestrial components.

The ultra-low loss of our fused fiber components helps to promote low noise and improved system margin in undersea transmission systems.

Full facilities are available to perform customer-specific HI REL qualification programs, which can consist of accelerated aging and Weibull analysis. Our design standard is 0.1 FITs, meaning failure-free operation for one billion field hours.

Manufacturing is carried out on specially-developed workstations, and advanced fiber management, in-process screening, and customer-specific validation tests are implemented, to further enhance component reliability. Components are supplied in regular or custom housings, depending upon the installation environment.

Key features

  • High polarization extinction ratio (PER)
  • High Power Handling
  • Low loss
  • Design standard 0.1 FITs (failure in one billion field hours)


Center wavelength9xx nm, 10xx nm, 1310 nm, 14xx nm, 15xx nm
Wavelength915-999 nm, 1000-1099 nm, 1310 nm, 1425-1499 nm, 1500-1599 nm ²
Coupling ratio99 / 1% ± 1.5%
Extinction ratio20 dB ³
Coupling ratio95 / 9% ± 1.5%
Extinction ratio20 dB ³
Coupling ratio90 / 10% ± 3.0%
Extinction ratio20 dB ³
Coupling ratio50 / 50% ± 5.0%
Extinction ratio17 dB ⁴
Excess loss0.4 dB
Return loss/directivity50 dB ⁵
Pigtail tensile load5 N ⁶
Operating temperature0 - +75° C
Storage temperature-40° C - +85° C
Fiber type250 µm Buffer PANDA PM Fiber ⁷
Optical power handling4 W
Reliability≤ 0.1 FIT

¹ All specifiations are for operation at center wavelength, room temperature, SOL (start of life) and no guard banding.
² Center wavelength selected from within the available wavelength ranges supplied.
³ Defined for signal path P1-P2.
⁴ Defined for both signal path P1-P2 and tap path P1-P3.
⁵ Return loss is the ratio of power launched to power reflected for port P1. Directivity for the 2x2 component is the ratio of power launched to P1 to the power reflected to P4. Guaranteed by design.
⁶ Fiber and taper proof testing during build to confirm strength.
⁷ Other fiber options available, contact G&H Sales.
⁸ FIT rate ≤0.1 is calculated for a 25 service life (typical service/storage conditions 40° C / 60% RH). This assumes an allowable change over life of 0.5 dB for taps ≤ 10% and 0.2 dB for taps ≥ 50% through to EOL (end of life).

Housing codeDescription DimensionsPigtail
3Regular3.0 mm (∅) x 60 mm (LPrimary-coated fiber

Order code

Guidance on how to create an order code is available in Downloads below.