Statistical analysis of subcarrier-modulated transmission over 300 m of 62.5-/spl mu/m-core-diameter multimode fiber
Statistical analysis of subcarrier-modulated transmission over 300 m of 62.5-/spl mu/m-core-diameter multimode fiber
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62.5/spl mu/m芯径多模光纤300 m以上副载波调制传输统计分析
DOI：
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发表时间：
2005
影响因子：
4.7
通讯作者：
I. White
中科院分区：
文献类型：
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作者：
A. Diab;J. Ingham;R. Penty;I. White
我们模拟子载波调制（SCM）传输超过300米的62.5-/spl μ/m的芯径多模光纤（MMF）使用1300 nm的边缘发射激光器和850 nm的垂直腔面发射激光器（VCSEL）的光束偏移从0到30 /spl μ/m。我们对81根“最差情况”光纤进行建模，同时根据中心波长为1300 nm时的2 ns/km差分模式延迟（DMD）标准和850 nm时的4 ns/km DMD标准对它们的带宽进行缩放，所有这些都是为了确保根据千兆以太网标准对最差5%的MMF进行建模。我们认为SCM载波频率从1到9 GHz的数据速率为1.25和2.5 Gb/s。结果表明，SCM传输与眼开罚（EOPs）低于3 dB的边缘发射激光器和垂直腔面发射激光器都可以实现在2.5 Gb/s。VCSEL被发现更适合于中心发射比偏移发射，而边缘发射激光器更适合于偏移发射在17至23 /spl mu/m的径向偏移。偏置发射下VCSEL的最佳性能区域是在0至8 GHz的载波频率下从17至30 /spl mu/m的径向偏置，在此期间我们观察到EOP小于5 dB，而对于边发射激光器，我们观察到在2.5至9 GHz的载波频率上从10至25 /spl mu/m的最佳性能区域。这意味着，如果忽略通道间串扰，则对于300 m的光纤长度，使用17和30 /spl mu/m之间的单个偏移发射，对于三个通道应该实现/spl sim/ 7.5 Gb/s的VCSEL的理论聚合最大比特率，以便对于每个通道实现小于5 dB的EOP。对于边发射激光器，对于两个信道，理论最大值为/spl sim/ 5 Gb/s，每个信道在长度为300 m的光纤上传输的EOP小于3 dB。我们还演示了频率响应的可用平均斜率（UAS）如何影响SCM性能：UAS大于0.6/spl times/10/sup-8/ dB/Hz意味着SCM性能严重恶化。
We simulate subcarrier-modulated (SCM) transmission over 300 m of 62.5-/spl mu/m-core-diameter multimode fiber (MMF) using 1300-nm edge-emitting lasers and 850-nm vertical-cavity surface-emitting lasers (VCSELs) for beam offsets from 0 to 30 /spl mu/m. We model 81 "worst-case" fibers while scaling their bandwidth according to a differential modal delay (DMD) criterion of 2 ns/km for our analysis at a center wavelength of 1300 nm and a DMD of 4 ns/km for analysis at 850 nm, all in order to ensure that the worst 5% of the MMF is being modeled as per the Gigabit Ethernet standard. We consider SCM carrier frequencies from 1 to 9 GHz at data rates of 1.25 and 2.5 Gb/s. Results show that SCM transmission with eye-opening penalties (EOPs) below 3 dB is achievable at 2.5 Gb/s for both edge-emitting lasers and VCSELs. VCSELs are found to be better suited for center launch than offset launch while edge-emitting lasers are better suited for offset launch at radial offsets of 17 to 23 /spl mu/m. The region of best performance for VCSELs under offset launch is from radial offsets of 17 to 30 /spl mu/m at carrier frequencies of 0 to 8 GHz, over which we observed an EOP less than 5 dB, while for edge-emitting lasers we observed a region of best performance from 10 to 25 /spl mu/m over carrier frequencies from 2.5 to 9 GHz. This means that if interchannel crosstalk was ignored, a theoretical aggregate maximum bit rate for VCSELs of /spl sim/ 7.5 Gb/s should be achieved for three channels using a single offset launch between 17 and 30 /spl mu/m for a fiber length of 300 m in order to achieve an EOP less than 5 dB for each channel. For edge-emitting lasers, the theoretical maximum is /spl sim/ 5 Gb/s for two channels with each having an EOP of less than 3 dB for transmission over a fiber of length 300 m. We also demonstrate how SCM performance is influenced by the usable average slope (UAS) of the frequency response: a UAS greater than 0.6/spl times/10/sup -8/ dB/Hz implies severe deterioration of SCM performance.