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10G SFP+ Transceiver-180x180.JPG)
10G XENPAK
40G QSFP+ TransceiverPerformance Feature
Stable
Low cost
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Economic
Dust-proof
High speed
Hot-pluggable
Good EMI, EMC
Wide appliaction field
DDM function available
Long transmission distance
Good Anti-static performance
Module Knowledge
Recommended
Calculate a Power Budget
You can make a rough estimate of a link power budget. For this, you must allow 0.75 dB for each fiber-to-fiber connection, and assume that fiber loss is proportional with length in the fiber. For a 100-meter run with three patch panels and 62.5/125 fiber that have a loss of 3.5 dB/km, the total loss is 2.6 dB, as shown here:
Fiber: 3.5 dB/km = 0.35 dB for 100 meters
Patch Panel 1 = 0.75 dB
Patch Panel 2 = 0.75 dB
Patch Panel 3 = 0.75 dB
Total = 2.6 dB
The measured loss is normally less. For example, the average insertion loss for an AMP SC connector is 0.3 dB. In this case, the link loss is only 1.4 dB. Regardless of whether you run Ethernet at 10 Mbps or ATM at 155 Mbps, the loss is the same.
Optical time-domain reflectometry (OTDR) is a popular certification method for fiber systems. The OTDR injects light into the fiber, and then graphically displays the results of detected back-reflected light. The OTDR measures elapsed transit time of reflected light to calculate the distance to different events. The visual display allows determination of loss per unit length, evaluation of splices and connectors, and fault location. OTDR zooms in to certain locations for a close-up picture of portions of the link.
While you can use power meters and signal injectors for many link certifications and evaluations, OTDRs provide a powerful diagnostic tool to get a comprehensive picture of the link. But OTDR requires more training and some skill to interpret the display.
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