Direct-Detection Optical OFDM Transmission System Without Frequency Guard Band

• Published in: IEEE photonics technology letters Vol. 22; no. 11; pp. 736 - 738
• Main Authors: Cao, Zizheng, Yu, Jianjun, Wang, Wenpei, Chen, Lin, Dong, Ze
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 64 quadrature amplitude modulation (64QAM); Direct-detection (DD); High speed optical techniques; interleaver; OFDM modulation; Optical filters; Optical mixing; Optical modulation; optical orthogonal frequency-division multiplexing (OOFDM); Optical receivers; Optical sensors; Optical transmitters; Quadrature amplitude modulation; Turbo codes
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2010.2044656

Interleaver and turbo code techniques are used in high spectral-efficient direct-detection optical orthogonal frequency-division-multiplexing (OFDM) transmission systems allowing significant improvement of optical receiver sensitivity by mitigating the unbalanced noise distribution in subcarrier signals. The optical signal-to-noise ratio of 5.18 Gb/s, 7.77-Gb/s coded OFDM (5.18 Gb/s after decoding), and 7.77-Gb/s coded OFDM with interleaver (5.18 Gb/s after decoding) over 200-km single-mode fiber at a bit-error rate of 10 -4 are 23.7, 18.0, and 17.1 dB, respectively.