ROSA for 200GBase-LR4 & 400GBase-FR8 transceivers
With its miniature size of only 15.5 x 6.5 x 5.8 mm and typical power consumption of barely 900 mW, the ROSA sets the standard for the next-generation of pluggable transceivers in data center and LAN applications.
The ROSA incorporates an optical de-multiplexer, integrated four PIN detectors and an array quad Trans-Impedance Amplifier (TIA) of extreme linearity supporting the PAM4 (Pulse-Amplitude-Modulation, 4 levels) modulation format. The optical signal it receives is four optically multiplexed signals over a single fiber utilizing the 1295.56, 1300.05, 1304.58, 1309.14 nm channels of the LAN WDM IEEE grid, each propagating at 28 GBdps. After de-multiplexing, opto-electronic conversion and amplification, it outputs four lanes of electrical data each at rates of up to 50 Gbps.
As such, the device constitutes the complete ROSA function for 200GBase-LR4 transceivers. By combining two ROSAs with different LAN WDM filter sub-sets, it empowers 400GBase-FR8 CFP8 transceivers, operating at 50Gbps on 8 lanes.
The core optical element, comprising a compact directly-reflecting multiplexing architecture, draws on Cube Optics’ intellectual property and the company's fabrication expertise.