Consider the commercial InGaAs pin photodiode whose responsivity is show in Figure 5.22. This is used in a receiver circuit that needs a minimum of 5nA photocurrent for a discernible output signal. Suppose that the InGaAs pin PD is used at 1.3um operation with a single mode fiber whose attentuation is 0.35 dB/km. If the laser diode emitter can launch at most 2mW of power into the fiber, what is the maximum distance for the communication without a repeater?

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