As we know that insertion losses of Arrayed Waveguide Grating (AWG) in the case of WDM has a fixed and low value i.e. 5 dB while insertion losses of Power Splitter (PS) is 3.5log(n) in case of TDM .that is large and depend the value of n. Where n is the number of output ports in power splitter.
Then why do we not always using WDM multiplexing?
WDM is not used, since active terminal equipment is still too expensive.
Agree with Bostjan. In industry one often trades a performance for cost efficiency.
Bostjan sir i think cost is different matter , we want to design an energy efficient network and for which we always not use WDM multiplexing
Amit, if you want to have energy efficient network, I will suggest not to use any splitter at all. In point-to-point optical access networks there is no optical splitting and therefore such solution has high energy-efficiency. If you use 1310 nm wavelength inexpensive Fabry–Perot (FP) lasers, you will also have lower banding losses than 1550 nm.
We build such networks for 10 years In Slovenia. Take a look on my paper: "Deployment of fiber-to-the-home in the Slovenian telecommunications market". https://www.researchgate.net/publication/235968448_Deployment_of_fiber-to-the-home_in_the_Slovenian_telecommunications_market
Article Deployment of Fiber-to-the-Home in the Slovenian Telecommuni...
Right, the cost is the key. Price for 1:32 splitter can be 40 USD. The price for 32/40ch AWG will be like 2000 USD. Furthermore in case of splitter (TDM PON) in client stations are cheap photodiodes and FP lasers. In case of WDM PON (AWG) there are reflective SOAs - RSOAs.
To Dominique: It is possible to reallocate clients in WDM PON as their RSOA are not wavelength selective and are seeded from main station.
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