Amendment Implemented to change PSC Code from R425 to 6625 .Item should be a dual Mach-Zender Interferometer. Should becapable of at least 40 Gb/s. Should interface with a Polarization Maintaining optical fiberwith FC/APC connectors. RF input connects should be K connectors. The modulationdrivers and electronics should be packaged with the system. Should have a bias controllerto enable stable modulation. Should have the capability for remote control from a PC.Should include all required connector cables. Electronics should use 120V US. Shippingshould be included. Also requested is a 40 GB/s photoreciever module. High speed photo receiver module. Should have 30 GHzbandwidth. Should have optical input with FC/APC connectors. Should have electricaloutput compatible with RF K connectors. Should be capable of receiving a maximum of 10mW of input optical power. Item should have a Noise Equivalent Power of 20 pW/sqrt(Hz)at 1 GHz or lower. Control electronics should be included to allow photo receiver to becontrolled through a computer with a USB connection. Should have a graphical PC userinterface. Should include all required connector cables. Electronics should use 120V US.Shipping should be included.