The NRZ transmitter module consists of InP Mach Zehnder Modulator and conventional Distributed Feed-Back (DFB) laser. The internal thermal and power control make the wavelength and optical power. The Optical Reference Transmitter ModBoxes are a flexible and efficient Electrical to Optical converter. Find out what's included and explore available upgrade options from Keysight. The Keysight N7718C optical. Extreme compatible 100GBASE-4WDM-40 QSFP28 transceiver supports up to 40km link lengths over LC duplex SMF fiber. This transceiver is compliant with SFF-8661, SFF-8636 and IEEE 802.