I am going to conduct a lab test for DWDM using the ONS 15540 ESPx carrying OC-48 client signal. As the simulated trunk cable is short I need to use attenuator to avoid blowing up the receiver on the OADM. Need your guys help to recommend a brand of attenuator for this kind of application. I am looking at 15 dB for 15XX nm wavelength. Just to confirm, for a pair/span, I need to connect the attenuator at the RX port at both end right? Apreciate the help. Thanks.
You also need to keep in mind that if the distance is to short and the attenuator is to close to the transmitter, the reflected light off the attenuator will be directed back towards the Tx laser. Which will also blow your transmitter. Optimal Rx level is around -18dbm.
Any 15 dB attenuator would do the job. 10 dB might be too low for some transponders. If you place a loopback directly on transpnders (without including OADM on the loop) a 20 dB attenuator would be preferable. Just avoid "air-gap" attenuators, as they cause lots of reflections.
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