Substantial improvement in the DSP's Optical Signal-to-Noise Ratio performance, in combination with its support of higher-order Quadrature-Amplitude-Modulation formats, expands capacity or reach of Metro, Regional, and Long Haul DWDM optical fiber links. The new 200G High Performance DSP improves OSNR performance with a brand-new DSP core whose Soft-Decision Forward-Error-Correction achieves 12dB Net-Coding-Gain , allowing either less optical repeaters or longer fiber reach between optical transceivers.