Enhanced optical power budget in DDO-OFDM-PON and CO-OFDM-PON system using frequency diversity

Next generation gigabit-capable passive optical network-2 (NG-PON2) system based on orthogonal frequency division multiplexing (OFDM) supports 40 Gb/s high speed optical access network because of its greater resistance to fiber dispersion, higher bandwidth efficiency and flexibility on both dynamic bandwidth allocation (DBA) and multiple services. In PON system, high optical power budget is required to increase the number of customer and/or to increase the access distance without adding any active device in the PON system. In this paper, a frequency diversity technique is used to increase the optical power budget of direct-detection optical-OFDM-PON (DDO-OFDM-PON) and coherent optical-OFDM-PON (CO-OFDM-PON) system. Analytical result show that at BER of 10 ³, there is 3 dB improvement in signal-to-noise ratio (SNR) and 1.5 dB improvement in optical power budget using proposed OFDM-PON architecture as compared to conventional architecture of OFDM-PON system. There is also 5.2 dB difference in receiver sensitivity between DDO-OFDM-PON and CO-OFDM-PON system.