This example shows the minimum optical power that a receiver needs to operate reliably with a BER below a specific value (see Figure 1). In this example, you calculate this input power by targeting a BER of 10-9, a Q factor equal to 6 for a PIN photodetector, and an APD.

Optical System - Figure 1 - Receiver Min Received Power

Figure 1: Receiver Min. Received Power

This example shows that the receiver sensitivity by using the PIN -32.8 dBm (see Figure 2) and the APD with a gain equal to 3, the sensitivity increases to -41.4 dBm (see Figure 3).

Optical System - Figure 2 - Power PIN

Figure 2: Power PIN

Optical System - Figure 3 - Power APD

Figure 3: Power APD

Optical System - Figure 4 - EYE PIN Receiver

Figure 4: EYE PIN Receiver

Optical System - Figure 5 - EYE APD Receiver

Figure 5: EYE APD Receiver