Jie Su, Xinying Li, Jianjun Yu. Direct-detection OFDM-QPSK system performance improvement enabled by DFT spread and receiver-based ISFA algorithm[J]. Chinese Optics Letters, 2016, 14(5): 050608
- Chinese Optics Letters
- Vol. 14, Issue 5, 050608 (2016)
Fig. 1. System structure of conventional DD-OFDM (Tx, transmitter, Rx, receiver; PRBS, pseudo random bit sequence; DAC, digital-to-analogue conversion; LPF, low-pass filter; EDFA, erbium-doped fiber amplifier).
Fig. 2. Principle of DFT-spread OFDM modulation and demodulation.
Fig. 3. Experimental setup for a 32 Gbaud OFDM-QPSK signal with 7 km SMF-28 transmission utilizing single-arm MZM in DD system (EA, electrical amplifier; OSC, oscilloscope).
Fig. 4. Constellation comparison of a 32 Gbaud QPSK after 7 km SMF-28 transmission when the input power into the PD is − 6.5 dBm
Fig. 5. Constellation comparison of a 32 Gbaud QPSK after 7 km SMF-28 transmission when the input power into the PD is − 8.7 dBm
Fig. 6. Curves of BER versus input power into a PD utilizing different techniques.
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