Title :
Transmission Performance of a 485-Gb/s CO-OFDM Superchannel With PDM-16QAM Subcarriers Over ULAF and SSMF-Based Links
Author :
Zhu, Benyuan ; Chandrasekhar, S. ; Liu, Xiang ; Peckham, D.W.
Author_Institution :
OFS Labs., Somerset, NJ, USA
Abstract :
We experimentally compare the transmission performance of a 485-Gb/s coherent optical orthogonal frequency-division-multiplexed (CO-OFDM) superchannel with PDM-16QAM subcarrier modulation over two types of fiber links, one based on ultra-large-area fiber (ULAF) spans, and the other on standard single-mode-fiber (SSMF) spans. Two amplification schemes, hybrid Raman/erbium-doped fiber amplifier (EDFA) and EDFA-only, are studied. We find that the optimum signal launch power is about 2 dB higher in ULAF than in SSMF for transmitting over 20 80-km spans under both amplification schemes. With EDFA-only amplification, the ULAF offers ~2-dB higher optimum Q2 factor than the SSMF after 1600-km transmission. With hybrid Raman/EDFA amplification, a transmission distance of 1600 km is achieved at Q2 = 9.2 dB by using the ULAF spans, which is 67% longer than that obtained with the SSMF spans.
Keywords :
OFDM modulation; erbium; multiplexing; optical fibre amplifiers; optical fibre communication; optical modulation; quadrature amplitude modulation; CO-OFDM superchannel; PDM-16QAM subcarriers; bit rate 485 Gbit/s; coherent optical orthogonal frequency division multiplexing; erbium-doped fiber amplifier; hybrid Raman fiber amplifier; polarisation division multiplexing; size 1600 km; standard single-mode-fiber spans; ultra-large-area fiber; Erbium-doped fiber amplifier; Optical fiber amplifiers; Optical fiber networks; Signal to noise ratio; Stimulated emission; Fiber-optics communications; hybrid Raman/erbium-doped fiber amplifier (EDFA); orthogonal frequency-division multiplexing (OFDM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2161277
