How To Solve The Pigtail Failure

Pigtail coiled caused by poor optical receiver no output

Analysis and Maintenance: Remove the fiber pigtail from the optical receiver pigtail head power meter measurement, the measured optical power is-1.3dB, this line distance is about 2.7km (per kilometer loss of 0.3dB)there is also a splice loss of 02dB, normal output pigtail. Turn on the power of the optical receiver, then access pigtailed optical receiver, the Signal Level Meter measured the optical receiver output is 98dB normal wear light output in the receiver cover not open the optical receiver lid pigtail no well plate, resulting in part of the pigtails pressure on the lid of the optical receiver crevices, resulting in no light power input to the optical receiver, re-plate a good pigtail, optical receiver back to normal, troubleshooting .

Pigtail head cleaning, resulting in the optical receiver output signal level is low

Analysis and Maintenance: The optical power meter to measure tail-4.5dB (cable optical power standards for 0-3dB), and then the Signal Level Meter the Metering receiver output signal level is about 48dB, is obviously not normal. Examination revealed a pigtail connecting the optical receiver of light dust, dirt, cotton ball with alcohol to wipe clean dust and dirt of the pigtail head, the then pigtail received optical receiver, and the Signal Level Meter measured the optical receiver output 98dB normal troubleshooting.

Overhaul Summary: The cause of the failure of these two cases is caused by the maintenance staff, careless in the connection of the pigtail and optical receiver in the repair process should pay attention to the end of the suspect's coiled correctly, pigtail less than 2cm in diameter bend, it will cause a greater attenuation. In addition, the connection must ensure that the pigtail head clean, so as to avoid failure.

Pigtail and poor fiber splicing, resulting in the optical receiver signal turtle output

Analysis and Maintenance: the face of this failure, first check the front-end optical transmitter and optical splitter is normal, if normal, check the optical node is normal, because this fiber optic cable distance of 2.7km. There are two splices. Pigtail head power meter measurement, found that the line failure, with OTDR measurements, measured at the 2.4km around the local failure in the front-end optical splitter. Because the first splice has passed, we can conclude that the fault lies between the fiber and pigtail. View and then weld the box fiber pigtail contacts are connected. Look contacts weld, but poor welding. Resulting in no light power output, call off the welding point, re-use of automatic welding machine for fiber and pigtail splicing. Welding a good measurement of contact loss is 0.2dB, normal. Using the power meter measured the optical transmission link loss is-1.4dB, normally, and the fiber pigtail box fasten, then pigtail connects to the optical receiver. Signal Level Meter to measure the optical receiver RF output signal level is 98dB normal optical receiver back to normal work and troubleshooting.

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