Contact: Brielle Day
The Optical Society
Caption: This shows the measured optical spectrum of the eight 100GHz-spaced 495Gb/s WDM signals at the launch into the transmission fiber. The insets are measured constellation diagrams before and after transmission. QPSK: quadrature phase shift keying; QAM: quadrature amplitude modulation; WDM: wavelength division multiplexed.
Credit: Image courtesy AT&T Labs
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