Asymmetrical TWDM-PON with 4 × 25-Gb/s downstream DSB OFDM and 4 × 10-Gb/s upstream OOK modulations

• We proposed an asymmetrical time wavelength division multiplexing passive optical network (TWDM-PON) scheme with 100-Gb/s downstream and 40-Gb/s upstream capacity using four pairs of wavelengths.
• The modulation of 25-Gb/s 16-QAM OFDM signal per wavelength can be operated within 10-GHz bandwidth to make the power penalty of double sideband (DSB) negligible for 20-km transmission.
• The sensitivity enhancement using reflective semiconductor optical amplifier (RSOA) in the optical network unit (ONU) is investigated.The experimental results show that the power budget for bidirectional transmission is more than 35.5-dB.
• This scheme can be a promising solution for 100-Gb/s TWDM-PON with high power budget.
• We believe that this paper includes creative technical achievements of significant consequence and would be very beneficial to most of the readers of OFT.

We propose and experimentally demonstrate an asymmetrical time wavelength division multiplexing passive optical network (TWDM-PON) scheme with 100-Gb/s downstream and 40-Gb/s upstream capacity using four pairs of wavelengths. Double sideband (DSB) orthogonal frequency division multiplexing (OFDM) with 16-QAM mapping is used for downstream transmission, while on–off keying (OOK) modulation is used for upstream transmission. The experimental results show that the power budget for bidirectional transmission is more than 35.5-dB. This scheme can be a promising solution for 100-Gb/s TWDM-PON with high power budget.