80 GBPS DOWNSTREAM TRANSMISSION USING DQPSK AND 40 GBPS UPSTREAM TRANSMISSION USING IRZ/OOK MODULATION IN BIDIRECTIONAL WDM-PON

We have proposed and demonstrated a bidirectional wavelength-division-multiplexing-passive optical network (WDM-PON) architecture based on differential quadrature phase shift keying (DQPSK) modulation for downlink and inverse return to zero or on-off keying (IRZ or OOK) modulation for uplink employing precoder in the optical network unit (ONU). In downlink 80 Gbps and in uplink 40 Gbps data rates have been transmitted over long haul single-mode-fiber. The transmission performances of OOK and IRZ modulation schemes for uplink transmission are compared. The impressive eye diagrams and low BER values are obtained from the bit error rate (BER) analyzer. Our proposed system is suitable to transmit high data rates over long-haul fiber link.