Remotely pumped EDFA-based 40-Gb/s downstream and 10-Gb/s upstream long-reach WDM PON employing RSOA and FBG equalizer

We propose a remotely pumped Er-doped fiber amplifier （EDFA）-based 40-Gb/s downstream and 10- Gb/s upstream transmission long-reach wavelength division multiplexing passive optical network （WDM- PON） scheme with downstream and upstream transmission implemented by quadrature phase-shift keying （QPSK） transceiver and reflective semiconductor optical amplifier （RSOA）-based intensity modulation direct detection （IM-DD）. Transmissions of the 40-Gb/s QPSK downstream, using a Mach-Zehnder mod- ulator, and the 10-Gb/s non-return-to-zero on-off keying （NRZ-OOK） upstream, using a 1.2-GHz RSOA equalized by fiber Bragg grating （FBG）, are demonstrated with 40-km fiber transmission.