56Gb/s PAM4 DML Driver

The HXT44121-1 is a single-channel, low-power, linear PAM4 Directly Modulated Laser (DML) driver with differential output and anti-reflection buffer design for LR applications. It supports signaling rates up to 56Gbps PAM4. In conjunction with a DML, the HXT44121-1 provides complete electrical-to-optical conversion, CML input with equalization, laser bias and modulations, laser power control, and various supervision.

The HXT44121-1 integrates several functions required for Automatic Power Control (APC), as well as internal and module temperature measurements and reporting. With an additional RSSI input, the user can directly measure the module receive optical power and report it. The device is designed as an AC-coupled packaged driver to work with TO-CAN or TOSA type of DML lasers.