How To Test The Quality Of Fiber Optic Splitters?

Fiber optic splitters play an indispensable role in distributing optical signals in fiber optic networks. They contain multiple outputs and inputs. Whenever the optical transmission of the network needs to be divided, fiber optic splitters are used to facilitate network interconnection.
Regular and thorough quality testing by network technicians and operators is crucial to ensure optimal performance and identify any potential issues, therefore proactive measures can be taken to maintain the reliability and efficiency of the network.
The quality of fiber optic splitters is usually determined by certain set specifications, such as insertion loss, uniformity, directionality, polarization related loss, return loss, etc.
Vision testing
One of the most convenient methods to test the quality of fiber optic splitters is to check for any gaps, cracks, loose connectors, or other physical damages. Ensure that the connectors are properly aligned, clean, and securely connected.
In some cases, adjusting the connectors of the splitter or rearranging the fibers can restore correct power distribution. However, before continuing, please identify and resolve any visible defects.
Insertion loss measurement
Insertion loss refers to the power loss that occurs when an optical signal passes through a splitter. Measuring insertion loss is important as it directly affects signal strength and overall network performance.
Insertion loss can be tested using a power meter and light source. It is measured by comparing the power levels of input and output ports. The insertion loss must be within the specified range provided by the splitter manufacturer. A lower insertion loss value indicates higher splitter performance and zero signal attenuation.
Uniformity measurement
Spectral imbalance, spectral ratio, or uniformity refers to the balance of power distribution between the output ports of a splitter. Unbalanced splitters can lead to uneven signal distribution, resulting in network performance issues.
Uniformity can be determined by examining the results of insertion loss testing to ensure that the difference between the lowest and highest losses is within an acceptable uniformity value. This value must be as close to zero as possible, as deviation indicates an imbalance that may lead to performance issues and signal attenuation within the network.
Return loss measurement
Return loss refers to the amount of light reflected back to the light source due to defects or mismatches in the splitter. High return loss can cause signal damage and reflection. The test can be carried out by connecting the input port of the spectrometer to the return loss meter and the output port to the non reflective refractive index matching gel. It is very important to ensure that the measured return loss falls within the specified range, as only high return loss indicates low reflection and good signal quality.
Polarization related loss
PDL is a parameter that measures the difference in insertion loss between different polarizations of light passing through a splitter. High polarization related losses can affect network performance and lead to signal distortion.
PDL can be calculated by comparing the power levels of two polarizations. A high PDL value indicates signal inconsistency and poor splitter performance. Ensure that the measured PDL falls within the acceptable range specified by the manufacturer.
Environmental and temperature testing
Fiber optic splitters may be sensitive to environmental conditions and temperature changes. It is recommended to test the splitter in different environmental scenarios and temperature ranges to determine its performance and stability. Monitor the uniformity, PDL, return loss, and insertion loss under different environmental and temperature conditions to detect potential inconsistencies and changes.
Regular testing and maintenance of splitters can provide efficient and reliable signal distribution while preventing any potential network performance degradation. In addition to referring to the specifications and guidelines specified by the manufacturer to obtain acceptable performance ranges and accurate testing procedures, it is also necessary to ensure that the splitter is appropriately rated for specific applications and meets the required industry standards.