When i connect two cables using a uu coupler, no light passes through the second cable. do you need ud to join two cables as an extension?

The need for UU vs UD depends on the cables themselves. However, you also need to be joining a male end to a female end with these couplers. If both of your MPO ends are female, then you're missing the alignment pins present on the male connector. These pins are essential to getting light through the second cable.

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Fiber Optic Loopbacks

Product ID: 306981252

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Sold byAmazon GuamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

CableRack MTP/MPO Fiber Optic Loopback Test Cable for Singlemode 9/125 : desertcart.ae: Lighting

Specifications

Number of Items	1
Unit Count	1.0 Count
Data Transfer Rate	40 Gigabits Per Second
Number of Pins	24
Additional Features	Compact
Connector Gender	Male-to-Male
Connector Type Used on Cable	Optical
Cable Type	Fiber Optic
Outer Material	Plastic or metal
Recommended Uses For Product	testing, troubleshooting, and verifying optics in data centers or wiring closets
Shape	Round
Color	MTP SM

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