| Popis: |
The paper presents the investigations targeted at broadening the bandwidth of the high speed photodector signal path. Photodetector output signal is formed in the signal path composed of the photodiode with appropriate cooling circuitry, short segment of transmission line and a high-speed amplifier. Bandwidth widening is achieved by including extra circuits in the signal tract (lossless and possibly also lossy one), which – together with inevitable mismatch at both ends of the transmission line - enable correction of the frequency characteristic. The trade-offs between gain, ripples of the AC characteristic and bandwidth are studied and presented in the paper. |
