High-speed transmission of adaptively modulated optical OFDM signals over multimode fibers using directly Modulated DFBs
High-speed transmission of adaptively modulated optical OFDM signals over multimode fibers using directly Modulated DFBs
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DOI：
10.1109/jlt.2005.860146
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发表时间：
2006
影响因子：
4.7
通讯作者：
J.M. Tang;P. Lane;K. Shore
中科院分区：
文献类型：
--
作者：
J.M. Tang;P. Lane;K. Shore
提出了自适应调制光正交频分复用（AMOOFDM）的光信号调制概念，建立了AMOOFDM调制解调器的理论模型。数值模拟的AMOOFDM信号的传输性能进行在未放大的多模光纤（MMF）为基础的链路，使用直接调制的分布反馈（DFB）激光器（DML）。结果表明，28 Gb/s超过300米和10 Gb/s超过900米的强度调制和直接检测（IMDD）AMOOFDM信号在1550 nm的传输是可行的，在基于DML的链路中使用具有200 MHz/spl middot/km的3-dB有效带宽的MMF。除了更高的信号容量，AMOOFDM还具有更高的频谱效率，并且与所有现有方案相比，对不同的发射条件、模式色散和光纤类型不太敏感。此外，还观察到约15 dB的大噪声容限。模数转换器（ADC）的位分辨率和AMOOFDM符号的循环前缀是限制最大可实现性能的主要因素，而在最佳工作条件下，DMLs对最大可实现性能的影响可以忽略。
A novel optical signal modulation concept of adaptively modulated optical orthogonal frequency division multiplexing (AMOOFDM) is proposed, and a comprehensive theoretical model of AMOOFDM modems is developed. Numerical simulations of the transmission performance of the AMOOFDM signals are undertaken in unamplified multimode fiber (MMF)-based links using directly modulated distributed feedback (DFB) lasers (DMLs). It is shown that 28 Gb/s over 300 m and 10 Gb/s over 900 m transmission of intensity modulation and direct detection (IMDD) AMOOFDM signals at 1550 nm is feasible in DML-based links using MMFs with 3-dB effective bandwidths of 200 MHz/spl middot/km. Apart from a higher signal capacity, AMOOFDM also has a greater spectral efficiency and is less susceptible to different launching conditions, modal dispersion, and fiber types, compared with all existing schemes. In addition, a large noise margin of about 15 dB is also observed. The bits of resolution of analog-to-digital converters (ADCs) and the cyclic prefix of AMOOFDM symbols are the main factors limiting the maximum achievable performance, on which the influence of DMLs is, however, negligible under the optimum operating condition.