摘要
[目的]为拓宽光通信在板级、背板级等短距互联场景的应用,文章设计了一种超低功耗的光发射器.方案的基本原理是采用Bias-T电路加载偏置电流和调制信号,驱动垂直腔面发射激光器(VCSEL)产生光脉冲信号.[方法]借助模拟仿真验证了方案的可行性,发现影响传输速率提升的主要因素是激光器件的寄生参数以及驱动电路的阻抗匹配;通过实验研究了在200 和 10 mm两种电传输距离下,驱动产生的眼图质量及误码率随驱动电压和偏置电流变化的规律.[结果]电传输距离缩短至 10 mm时,能获得更大有效消光比,范围为 0.84～6.69 dB,最小差分驱动电压为 200 mV,最小偏置电流为 15 mA,光发射功耗降低至 1.2 mW/Gbit/s.相比于传统光模块,光发射功耗降低约 80%.[结论]该光发射器方案可应用于数据中心内部,配合低功耗光接收器,能显著降低数据中心整体功耗.
Abstract
[Objective]In this paper,an ultra-low power consumption optical transmitter is developed to broaden the application of optical communication in short-reach interconnection such as board level and backplane level.The basic principle of the scheme is that the Vertical-Cavity Surface-Emitting Laser(VCSEL)laser generates an optical pulse signal after loading a bias current and a modulation signal through a Bias-T circuit.[Methods]In this work,the feasibility of the scheme is verified by means of simula-tion.It is also found that the main factors affecting the increase of the transmission rate are the parasitic parameters of the laser de-vice and the impedance matching of the drive circuit.The two electrical transmission distances of 200 and 10 mm are studied by experiments.And the law of eye diagram quality and bit error rate as a function of driving voltage and bias current is studied through experiments under two electrical transmission distances.[Results]The results show that a larger effective extinction ratio ranging from 0.84 to 6.69 dB can be obtained by shortening the electrical transmission distance to 10 mm with the minimum differ-ential driving voltage of 200 mV,the minimum bias current of 15 mA,and the power consumption of 1.2 mW/Gbit/s.Compared with traditional optical modules,the power consumption of optical transmission is reduced by about 80%.[Conclusion]This opti-cal transmitter solution can be applied to intra-data center.Combined with low-power optical receivers,the overall power con-sumption of the data center can be significantly reduced.
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