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Title: Line coding to enhance the performance of 10-Gb/s CPFSK-ASK directly modulated signals
Authors: Al-Qazwini, Z.
Kim, H. 
Issue Date: 12-Apr-2010
Citation: Al-Qazwini, Z., Kim, H. (2010-04-12). Line coding to enhance the performance of 10-Gb/s CPFSK-ASK directly modulated signals. Optics Express 18 (8) : 8360-8366. ScholarBank@NUS Repository.
Abstract: The major drawback of frequency modulation (FM)-based directly modulated laser (DML) is its non-uniform FM response at low frequency range which gives rise to a severe pattern-dependent performance degradation. In this paper, we investigate the use of line coding to deplete the low-frequency spectral contents of the signal and thus to alleviate the degradation. We examine various line codes (8B/10B, 5B/6B, 7B/8B, 9B/10B, and 64B/66B) with continuous-phase frequency-shift keying/amplitude-shift keying (CPFSK/ASK) signals generated using a DML and a delay interferometer. Experimental demonstrations are performed with a long pseudorandom bit sequence length of 220-1 and the bandwidth expansion by each code is taken into consideration. The results show that among the five codes we tested, 9B/10B code outperforms the other codes in terms of receiver sensitivity an dispersion tolerance. We demonstrate successful transmission of 10-Gb/s CPFSK-ASK signals over 65-km standard single-mode fiber with a bandwidth expansion of only 11.1%. © 2010 Optical Society of America.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OE.18.008360
Appears in Collections:Staff Publications

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