In Wavelength Division Multiplexing based Passive Optical Network (WDM-PON), multiple wavelength used to separate Optical Network Unit (ONU). Which actually increase the capacity of PON .WDM process can be dense and ultra-dense depending on channel spacing. In this paper we compare performance of Array Waveguide Grating Demultiplexer (AWG DEMUX) and Fiber Bragg Grating based Demultiplexer (FBG DEMUX) in dense and ultra-dense WDM at the data rate of 2.5 gbps. Optical fiber length used is 10 km. The maximum and minimum Q factor is compare and discussed. All the simulation were performed in optisystem 12.0.

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Orthogonal Frequency Division Multiplexing (OFDM) is an multicarrier modulation Format that can be easily adopted by different telecommunication standards such as LTE, LTE-A, Wi-Fi & WiMAX etc, now getting used in optical fiber communication. Chromatic dispersion arises due to Inter Symbol Interference (ISI) and it is serious issue in longdistance communication. The performance of CO-OFDM / WDM-RoF System has been analyzed for long distance communication by measuring the Q-factor and Bit Error Rate (BER).

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