This impulse response, typical of the Models 1444 , was measured with a 50-GHz scope and a 150-fs full-width-at-half-maximum input pulse at 1.55 µm.

Typical frequency response of the Model 1444 . Input power was 1 mW at 1.06 µm. Measurement accuracy is ±1.5 dB up to 25 GHz.