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--- rb:sfp [07/05/2018 10:16] – created - external edit 127.0.0.1
+++ rb:sfp [05/02/2025 10:30] (current) – [WDM Fibre] andrew
@@ Line 2: / Line 2: @@
 SFP modules followed on from [[rb:gbic|GBIC]] modules and are used in both ethernet and fibre channel switches (and others too), they are usually optical I/O modules although RJ45 copper Ethernet ones are available. Ethernet modules are most commonly 1GB/s but 10GB/s and higher are available. SFP used for Fibre channel can be 1 or 2GB/s but most common is 4GB/s.
+===== LC Fibre =====
 {{:rb:sfp1.jpg?200|}}
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 {{:rb:sfp-plug.gif?200|}}
+===== RJ45 =====
 Although less common, SFP modules can have an RJ45 socket for copper connectivity.
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 {{:rb:20180117_193058.jpg?200|}}
 {{:rb:20180117_193033.jpg?200|}}
+===== WDM Fibre =====
+{{ rb:img_20250129_180855.jpg?200|}}
+{{rb:img_20250129_181046.jpg?170 |}}
+Another option is Wavelength Division Multiplex SFP which use two different wavelength for Tx and Rx, so only needing one fibre. This example uses SC single mode ( SC == Stick 'n' Click )
+----
+{{:rb:img_20250129_181153.jpg?200 |}}
+As this used two wavelengths, the SFP needs an optical splitter, and will have both a laser and receiver on the two prism ports.
+----
+{{:rb:img_20250129_181211.jpg?200 |}}
+I'm guessing here, but I believe the laser is mounted at the rear with the 3 pins connection to the PCB, and the RX connecctions are on the side with flexible connection to the PCB.
+{{ rb:img_20250129_181824.jpg?200|}}
+----
+{{:rb:img_20250129_181655.jpg?200 |}}
+Closeup of the Prism housing and SC recepticle.