OPTICAL FIBRE

We offer the following range of services in Optical Fibre:

  • Internal, external and blown fibre Solutions
  • Direct Terminations & Splicing
  • Pre-Termination Solutions
  • Testing:
  • Continuity, Insertion loss measurement (power meter light source), OTDR, certification & Chromatic Dispersion
  • Fault finding and support
  • Design Consultation
In addition we can provide copper data infrastructure solutions to your installations.

Internal, External and Blown Fibre Solutions

Greenstone can provide multimode and single mode fibre solutions in most environments, such as - commercial networks, data centres, utility networks, CCTV systems, Fire Safety systems, Building Management systems, and long haul networks for voice, data, video or television. We have the capability to supply and install blown fibre solutions, mini/micro and conventional cables.

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Direct Terminations & Splicing

Greenstone are specialists in the installation and termination of multimode and single mode fibre optic cabling infrastructures. We have the latest fibre optic termination equipment, using core-alignment fusion splice machines.

Our fibre optic termination engineers have the experience and knowledge to terminate fibre optic cores ensuring the lowest cable loss. Our engineers have years of international experience working in many different environments such as: internal/external, data centres, business campuses, hospitals, shopping centres, schools, universities, airports and financial establishments to name a few.

Apart from fusion splice technology we can provide direct termination methods depending on the environment and best suited solution for you the client.

Examples of direct termination methods are:

  • Epoxy and Polish
  • Lightcrimp
  • Hot-melt
  • Anaerobic adhesives
  • Mechanical splicing

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Pre-termination Solutions

Greenstone Networks have the ability to supply pre-terminated solutions such as: multi- ended floatable cables, harnesses, patch leads and pre-connectorised interlinks. Furthermore the M2FX product range allows you to float/blow already pre-terminated fibre with Ballistix end caps and `Quickpush’ technology (as shown below).

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Testing

Continuity:

A continuity check is one method for fibre optic testing and is done to ensure that the fibre has not been broken at any point, or to check that the fibre under test does indeed go from one location to the correct destination. Possibly the most frequently used method is to use a safe visible light source, particularly a safe high power visible red laser or LED. By injecting this light into one end of the fibre and checking that it is visible at the far end it is possible to determine that the fibre is indeed unbroken, or that the fibre under test does indeed go to the correct location. A decent light source will also highlight any fractured or kinked fibres with a visible glow, also fibres that are bent to tightly will also show light escaping. Visible light sources are sometimes not effective over long distances or with Single Mode cables, other methods for checking continuity under these circumstances is by using an infra red light source & power meter or an OTDR.

Insertion Loss Measurement (ILM):

This is a measurement of the loss, or attenuation, of a fibre optic component or system. This is normally measured with a light source and an optical power meter, or alternatively a loss test set that incorporates both a light source and power meter. The principle is to find the difference between the input and output power levels to yield the loss between these two measurement points. This sounds straightforward, and yet whilst ILM testing can be easy, there are also many mistakes that can be made and result in variable measurements and plain incorrect measurements. Some of the errors that can occur in ILM measurement methods are obvious, whilst others are more obscure and not widely known by testers who have not been trained by fibre optics testing experts. This is sometimes also abbreviated to LSPM for Light Source and Power Meter.

OTDR:

The Optical Time Domain Reflectometer is a powerful fibre optic test instrument in that it acts like an optical radar in locating sources of error with the fibre system. The OTDR yields a plot, or trace, indicating the loss versus distance. This information allows events in the optical fibre system such as fibre splices and connections to be located and their loss measured. The OTDR is a complex instrument and so detailed interpretation of an OTDR trace is a job for an experienced or expert fibre tester. The OTDR is not the reference test method for fibre attenuation; this being an ILM technique, and indeed the OTDR has some short-comings as an accurate loss measurement instrument. Where the OTDR does dominate is in the spatial information it provides on any fibres with high attenuation, or any poor quality splicing. The other advantage of the OTDR technique is that the stored trace shows exactly how the measurement was conducted, something the ILM technique does not provide, and this allows an expert OTDR trace analyser to know something of the quality of the measurement results provided.

Chromatic Dispersion:

The field measurement of the chromatic dispersion of single-mode optical fibres is now becoming standard for telecommunications systems. This test is designed to see the change in group delay (effectively the spreading or dispersion) of optical signals of different wavelengths (chromatic infers different colours or wavelengths of light). This chromatic dispersion can be the limiting factor in achieving high bit-rates through the fibre system. Although a common laboratory measurement for fibre factories, the need for this measurement in the field comes from ever increasing bit rates and optical amplification leading to long optical spans between transmitters and receivers. The measurement method used is normally double ended and involves measuring the delay of a wavelength of light by reference to the phase of a high-frequency signal. For field measurements the differential phase shift technique (sometimes called the double demodulation technique) is the most common method employed, but there are other techniques including a single-ended OTDR time-of-flight technique.

We strive to use the most up to date testing equipment on all of the above methods available on the market and our engineers are qualified and trained to European (EN) (FIA) and IEEE standards, as well as the local FOA (Fibre Optic Association) standard.

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Certification

With both OTDR and ILM testing we will provide detailed test certificates of all tests completed for our clients.

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Fault Finding & Support

We have the ability to mobilise on short notice to assist in network faults within existing and `live’ environments on a call-out basis. We can assist with network migration, remedial activities, network commissioning services including patching services and network health checks are also available on request. After installation support are available to all our clients and our workmanship is guaranteed for 12 months after completion.

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Design and Consultation

Our design and CAD team are qualified to (RCDD) (UK) standards with European experience capable of custom designing network requirements to the client’s specified requirement.

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Product Consultation

Greenstone Networks are the exclusive agent for the M2FX fibre products, these are specialist products designed for last mile fibre solutions. The M2FX product range is also showing great success in specialist implementation markets such as automotive, aerospace and the mining industry. For more information please visit our products section or visit the M2FX website at – www.m2fx.com

We have a wealth of experience in consultation, recommending the correct product for the correct environment. Please contact us for more information regarding your optical fibre requirements.

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