Directional Coupler?
What it means when it says 3dB DC, or 12dB DC, or 6dB DC? Is star coupler considered as directional coupler?
How to solve this example:
1) Given a 12dB directional coupler, How does it operate if an optical power of 1mW enters fr input pot #1. How much power exits from each of the terminal #2,#3, and #4? [no loss is considered]
2)What would happen at output terminal DC above if 2mW signal at a different wavelength enters fr second input pot #4?
3)How does a 4×4 DC operate? how can a 4X4 star coupler acts as a wavelength multiplexer?
A directional coupler couples (splits) the RF microwave power only if it travels in the forward direction and does not split if the power travels in the reverse direction.
A 3dB DC splits 1/2 of the incoming power into the couple port. A 6dB DC splits 1/4 of the incoming power into the couple port. And a 12dB DC splits 1/16 of the incoming power into the couple port.
A star coupler (one input port to many output ports) may or may not be a directional coupler.
Basic RF Distribution: Taps & Directional Couplers
