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The Keysight N7711A tunable laser is available with C-band or L-band wavelength coverage. It can reach any wavelength point within its specified wavelength in the C- and L-band range. The narrow linewidth and offset grid fine-tuning capability makes it an ideal source for the realistic loading of the latest transmission systems. In system loading applications, it may be preferable to grid-tune the laser like a system transmitter, simply by changing the channel index. The channel grid is adjustable to standard ITU-T grid spacing like 50 GHz, and to arbitrary grids. The Keysight N7711A tunable laser is available in a compact format with half-rack width and one rack-unit height.