Help me to devlop optical power meter using arduino to measure 850nm to 1650nm optical wave power level eanging from +5dBm to -45dBm. Arduino will be connected to mobile usb port to draw electric powerand to display reading.
Proceed with a photodiode, AD8307 amplifier and an Arduino Nano.
Quite wide ranges. -45dBm to +5dBm is 100 000x.
Also for that range of wavelength you need InGaAs photodiode.
You'll need a working meter to calibrate it with.
We have one at work for measuring fiber optic signals. It doesn't have gain-sensitivity range-settings but it has 3 wavelength settings of 850, 1300, and 1550 nm. Since it's not switching optical filters, these are obviously different sensitives to adjust for the photodiode characteristics. You'll probably have to do something similar depending on your photodiode characteristics and how much accuracy you need.
And it's rated for +3 to -50dBm so that's about what you're trying to get. Like I said, there are is no user range setting but that's a VERY wide range and there's probably some internal auto-ranging.
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