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Digital High-Speed Analysis up to 3 Gb/s
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Fig.1 shows exemplary a test setup of a transmitter module which is part of a high-speed optical link for throughputs of 2.488 Gbit/s. A stimulus and a pulse generator generate 12 pseudo-random bit input streams (PRBS, 2^16-1) and one clock signal, respectively. A high-speed InGaAs detector converts the optical output of a 3-km long single-mode fiber into an electrical signal. A digital oscilloscope records the incoming bit stream for timing and operation points optimization. |
Fig.1 |
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A more comprehensive test setup for bit-error rate measurements of the complete link is shown in Fig.2. All transmitter inputs as well as all receiver outputs are electrically connected to our digital HP82000 semiconductor tester. Again a 12-bit PRBS (2^16-1) drives the input interface. Transmitted vectors are compared to the input vectors. Occurred errors are monitored online and stored for statistical analysis. |
Fig.2 |
