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OTQ-40G-XX series single-mode QSFP+ transceiver is designed for single-mode fiber optical data communications such as 40GBASE-LR4. The transceiver consists of two sections: The transmitter section consists of four directly modulated uncooled CWDM 4- 1271, 1291, 1311, and 1331 nm DFB lasers and four drivers. The receiver section incorporates four PIN photodiodes integrated with four trans-impedance preamplifiers (TIA) and four limiting post-amplifier ICs. The module is with the QSFP+ 38-pin connector to allow hot plug capability. The internally AC-coupled high-speed serial I/O simplifies interfacing with external circuitry. Only a single 3.3V power supply is needed. A serial EEPROM in the transceiver allows the user to access transceiver digital diagnostic monitoring and configuration data via the 2-wire QSFP+ Management Interface. This interface uses a single address, A0h, with a memory map divided into a lower and upper area. Basic digital diagnostic data is held in the lower area while specific data is held in a series of tables in the high memory area.