Fiber Characterization

Optimizing fiber performance through characterization

As optical networking migrates to 10 Gbps and faster speeds, the need for higher-quality fiber increases dramatically. Above 2.5 Gbps, the increased effects of dispersion, reductions in optical power budget, and the introduction of complex new technologies such as DWDM, ROADM, Erbium-Doped Fiber Amplifiers (EDFA), and Raman amplifiers create much greater sensitivity to impairments.

Turning up, Speeding up, or otherwise modifying an optical fiber network must require the quality of their infrastructure. Accurately evaluating the quality of fiber spans requires a very high level of expertise and complex test equipment.For most network service providers, equipment manufacturers, and contractors, it makes sense to outsource periodic fiber characterization to specialists who can get the job done quickly and correctly.

Different independent services offered by Savitri Telecom that verifies the quality and integrity of new or existing optical fibers to determine their suitability for today’s high-speed applications. Our expert field engineers perform comprehensive testing using the fiber optic measurement instruments that are meticulously maintained and calibrated. With comprehensive reports that detail results and give clear analyses and recommendations.

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Fiber Inspection and Cleaning
Determining the cleanliness of surfaces before connections in a fiber cable system is very vital to ensure quality and uninterrupted communication through the fibers. The cleaned surfaces have to be inspected using scopes to ascertain the suitability for Fiber characterization.
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Optical Insertion Loss Measurement
Optical Fiber insertion loss is the essential basic testing during the installation and acceptance testing phase. Poor insertion can have a far-reaching impact on network performance. In PON we use splitters and combiners for point to multi point communication over fibers. The optical insertion loss of a splitter adds to the overall loss of optical power in the cable system. We need a light source and an optical power meter to measure the insertion loss of a splitter in the fiber path. Savitri Telecom offers optical power meters and light sources for both single channel and multichannel applications. The laser and LED sources are inbuilt in the test instruments.
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Optical Return Loss Measurement
Optical return loss measurements can help in checking whether an installation was completed accurately. They can confirm that the optical connectors were inspected and are clean. Savitri Telecom offers battery-operated field-portable optical return loss meter with 1260 to 1650 nm wavelength range (1 nm incremental setting) at the power meter, multiple wavelengths at the source and return loss up to 70 dB. It can measure optical return loss, optical power, optical insertion loss, and inspection of optical connectors.

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The Optical Time Domain Reflectometer helps in testing the integrity of a fiber optic cable, verifying splicing loss, and finding faults including distance to the break in the cable. By transmitting and analyzing pulsed laser light beamed through an optical fiber, we can characterize, troubleshoot, and maintain the fiber.
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Chromatic Dispersion (CD)
Chromatic Dispersion (CD) causes pulse broadening and can affect transmission performance by increasing the Bit Error Rate. A single instrument to measure Chromatic Dispersion as well as Polarization Mode Dispersion and Attenuation Profile is offered by Savitri Telecom.
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Polarization Mode Dispersion (PMD)
Two different polarizations of light traveling a common path in a fiber have different speeds due to random imperfections and asymmetries in the inner surface of the fiber. This causes a differential group delay and there is random spreading of the optical pulses. A single instrument to measure CD, PMD and AP is available and is offered by Savitri Telecom.
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Attenuation Profile (AP)
Absorption and scattering losses mainly cause attenuation of optical power in fiber networks. The purpose of the AP measurement is to represent the attenuation as a function of the wavelength. Spectral attenuation can be measured using an OSA and a broadband light source. It can also be measured using a multi-wavelengths or tunable light source and a broadband power meter. A portable instrument for AP measurement is offered by Savitri Telecom.
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