14-pin PMF laser launch light into modulator (laser module is actually mounted on PCB, but is not shown in the photos below which took from another same board without laser). There are two RF inputs in modulator, drived by two RF amplifiers (one is from MTC5531 clock driver module, the other is from SA1137-2 modulator driver module) in SMA interface. Output fiber of modulator connects to a tap fiber coupler, then directly leads to 10Gb optical receiver MTRX192AR, then send to limiting amplfier module RA1137. There is tap output of fiber coupler leads to a photodiode. There is also a 400mA LDD400-1P laser driver module on the PCB.