Integrated Device Technology, Inc. (IDT; NASDAQ: IDTI) said it has introduced the GX76470 64G die linear driver for optical integrated modules for 400G and 600G coherent applications.
The IDT GX76470 linear driver is designed forthe Optical Internetworking Forum (OIF) defined, integrated optical subassembly modules, including the high-bandwidth co-packaged driver modulator (HB-CDM), and integrated coherent transmitter-receiver optical subassembly (IC-TROSA). Such subassemblies enable optical transceiver module miniaturizationand component cost reduction for 400G ZR, metro, and data center interconnect (DCI) applications. IDT sees the GX76470 enabling optical subassemblies that are potentially applicable to QSFP-DD, OSFP, CFP4-ACO, and CFP2-DCO optical modules.
Delivering more than 40 GHz of bandwidth with a peaking control functionality, the GX76470 die linear driver features an AC-coupled 100-Wdifferential input/DC-coupled 55-W differential output interface. Transmission register integration on the driver die assures optimal impedance matching with optical modulators, IDT attests. The driver has tuning capabilities for linearity, output voltage swing, and power consumption through SPI registers.
The GX76470 supplies high linearity, with coverage of the maximum output voltage swing range of 2.8 Vpp differential, total harmonic distortion (THD) of less than 1.5% up to 2 Vpp differential output voltage swing, and less than 0.5 W per channel power consumption. According to IDT, these are suitable for driving diverseoptical modulator types at 64 Gbps, as well as maximizing the E/O frequency response.
Additionally, various control functionality is provided by the GX76470 driver, including gain control and output voltage setting, peak detector and gain monitoring through the analog control/monitoring pins, and OIF-compliant SPI digital interface.
In February 2017, IDT agreed to acquire GigPeak, which itself launched a 64-Gbaud quad-channel linear optical modulator driver in a 14x9.1-mm surface mount technology (SMT) later that year (see "IDT to acquire GigPeak for $250 million" and "Gbaud SMT quad linear modulator driver for coherent systems").
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