Bifurcated Trifurcated fibre optic assemblies

We specialise in the termination of optical fibres, connectors and devices across diverse sectors, medical, aerospace, sensor, telecommunications, defence and more.

Bifurcated Trifurcated fibre optic assemblies

When two or more optical fibres are placed in a single protective jacket this is called a fibre optic bundle. Fibre optic bundles are extensively used in spectrometry for either conveying different samples simultaneous into a spectrometer or for extending the range or the resolution using multiple spectrometers. A bifurcated assembly is a fibre optic bundle used to either combine or split signals.

Alker Fibre Optic Specialists have designed and manufactured a double bifurcated fibre optic assembly with each input leg being a coherent bundle of two different fibres that cross over a central block, into a coherent bundle of two equal fibres in each of the output legs. A 4-ribbon electrical cable in one input leg splits into 2 ribbon cables in each one of the output legs. The input legs are keyed for alignment by a unique construction of the connector ferrule. The whole assembly is armoured and water-resistant with the actual connectors protected by an IP68 gland.

Features

  • 2×2 assembly;
  • Both aligned: connectors with keyway polarisation, and unaligned fibre legs;
  • SMA905 custom connectors specially design to sit both fibres, keyed for alignment;
  • 400um and 600um core fibre;
  • Armoured;
  • Water-resistant;
  • IP68 gland;
  • 4 Ribbon cable in one input leg that splits in 2ribbon cable in each output leg.

Custom Versions Available

  • Variations on input and output legs: 2×1, 3×2, etc;
  • Custom fibre: the fibres used in each leg can be the same or different, based on the optimisation of fibre core or wavelength range or both;
  • Custom connectors with ferrules able to sit a different number of fibres.

This assembly is currently used in a dual-field-of-view system able to incorporate multiple spectrometers covering different spectral ranges, with a cosine-corrected foreoptic to capture down-welling irradiance and the up-welling channel configured with a view angle-limited foreoptic. [1] One input leg for up-welling light and the other for down-welling light, each holding a bundle of fibres that cross over so that one up-welling and one down-welling go to each spectrometer [2]; therefore each measurement has the same support).[1]

An electromechanical shutter in each foreoptic allows for one to be closed to exclude light entering the system while the other is open. Hence, by switching between the two shutters, down-welling and up-welling light can be recorded sequentially.[2] This system is lightweight, self-contained and wirelessly controlled to enable it to be deployed on rotary-wing unmanned aerial vehicles (UAVs), as well as being able to be used for fixed location high temporal frequency logging measurement approaches.[1]

The system, developed by the University of Edinburgh, is used by NASA, Valencia University, Helsinki University, Wisconsin University and Poznan University to measure near-ground sun-induced chlorophyll fluorescence (SIF) in order to validate the SIF estimates from air and spaceborne measurements with correction for atmospheric effects.

[1]A. Mac Arthur, A.; Robinson, I.; Rossini, M.; Davis, N.; MacDonald, K. A dual-field-of-view spectrometer system for reflectance and fluorescence measurements (Piccolo Doppio) and correction of etaloning. In Proceedings of the 5th International Workshop on Remote Sensing of Vegetation Fluorescence, Paris, France, 22–24 April 2014.

[2] Mihai, L., Mac Arthur, A., Hueni, A., Robinson, I. and Sporea, D. (2018). Optimized Spectrometers Characterization Procedure for Near Ground Support of ESA FLEX Observations: Part 1 Spectral Calibration and Characterisation. Remote Sensing, 10(2), p.289.

 

Unique Selling Points

Armoured and water-resistant

We specialise in the termination of optical fibres, connectors and devices across diverse sectors, medical, aerospace, sensor and more.

Variations on input and output legs

We specialise in the termination of optical fibres, connectors and devices across diverse sectors, medical, aerospace, sensor and more.

Custom fibres and connectors

We specialise in the termination of optical fibres, connectors and devices across diverse sectors, medical, aerospace, sensor and more.

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