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For a slow detection system, a pulsed laser will appear CW. In order to define slow, see "Line-width limit". A pulse will last between 10 and 100 ns and will be repeated at a rate corresponding to 0...3% for usual DFBs and up to 10...20% for high power DFBs. At 10 ns pulse length, the line-width will be close to minimal in pulsed operation, less than 0.1/cm, and at 100 ns it will be larger, depending on the device.