Towards full band colorless reception with coherent balanced receivers.
Towards full band colorless reception with coherent balanced receivers.
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DOI：
10.1364/oe.20.010339
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发表时间：
2012-04
期刊：
影响因子：
3.8
通讯作者：
Bo Zhang;C. Malouin;T. Schmidt
中科院分区：
文献类型：
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作者：
Bo Zhang;C. Malouin;T. Schmidt
除了光纤信道损伤的线性补偿之外，相干接收器还提供在多个入射波长内的任何期望的数据信道的无色选择，而不需要信道选择滤波器。在本文中，我们调查无色接收使用相干平衡接收机的设计要求，同时考虑到光前端（OFE）和跨阻抗放大器（TIA）。我们开发的分析模型来预测系统的性能作为接收机设计参数的函数，并显示出良好的协议对数值模拟。在低输入信号功率，最佳的本地振荡器（LO）的功率存在的热噪声与残余LO-RIN拍噪声平衡。在高输入信号功率下，我们发现主要的噪声效应是带外（OOB）信道的残余自拍噪声，它不仅与OOB信道的数量和OFE的共模抑制比（CMRR）成比例，而且还取决于链路残余色散（CD）和相对于接收器的极化支路的方向。OOB通道的残留自拍噪声设定LO功率的下限。我们还研究了TIA中过载所带来的限制，分析表明，DC电流仅与OOB通道的数量成比例，而差分AC电流仅与链路剩余CD成比例，这会导致高峰均功率比（PAPR）。TIA输入端的直流和交流电流都设定了LO功率的上限。考虑到OFE噪声限制和TIA过载限制，我们表明，接收机的工作范围显着缩小分散管理的链接，相比分散管理的链接。
In addition to linear compensation of fiber channel impairments, coherent receivers also provide colorless selection of any desired data channel within multitude of incident wavelengths, without the need of a channel selecting filter. In this paper, we investigate the design requirements for colorless reception using a coherent balanced receiver, considering both the optical front end (OFE) and the transimpedance amplifier (TIA). We develop analytical models to predict the system performance as a function of receiver design parameters and show good agreement against numerical simulations. At low input signal power, an optimum local oscillator (LO) power is shown to exist where the thermal noise is balanced with the residual LO-RIN beat noise. At high input signal power, we show the dominant noise effect is the residual self-beat noise from the out of band (OOB) channels, which scales not only with the number of OOB channels and the common mode rejection ratio (CMRR) of the OFE, but also depends on the link residual chromatic dispersion (CD) and the orientation of the polarization tributaries relative to the receiver. This residual self-beat noise from OOB channels sets the lower bound for the LO power. We also investigate the limitations imposed by overload in the TIA, showing analytically that the DC current scales only with the number of OOB channels, while the differential AC current scales only with the link residual CD, which induces high peak-to-average power ratio (PAPR). Both DC and AC currents at the input to the TIA set the upper bounds for the LO power. Considering both the OFE noise limit and the TIA overload limit, we show that the receiver operating range is notably narrowed for dispersion unmanaged links, as compared to dispersion managed links.