Whats the difference between a time-domain-optimized detector and a frequency-domain-optimized detector?
Photodiodes in frequency-domain-optimized detectors are designed to produce a flat frequency response, where the responsivity varies only slightly across the operating bandwidth. Time-domain-optimized detectors, in contrast, produce clean, ring-free pulses. By using Fourier-transform methods, you can show that clean ring-free pulses result in a characteristic roll-off in the frequency domain. On the other hand, a flat frequency response results in some controlled ringing in the impulse response.
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