Polarization-Independent Receivers for Low-Cost Coherent OOK Systems
Polarization-Independent Receivers for Low-Cost Coherent OOK Systems
复制标题
用于低成本相干 OOK 系统的偏振无关接收器
DOI：
10.1109/lpt.2013.2296943
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发表时间：
2014
影响因子：
2.6
通讯作者：
E. Ciaramella
中科院分区：
文献类型：
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作者：
E. Ciaramella
分析论证了一种在低成本相干OOK接收机中获得偏振无关操作的新方案，该方案适用于接入网。我们从著名的相位分集接收器发展而来，采用了3×3耦合器、三个光电二极管和基本模拟处理。如果将接收器修改为将本机振荡器(或信号)注入具有适当偏振态的两个输入端，我们通过数学推导和数值模拟表明，所产生的电信号可以是与偏振无关的；只有当信号载波和本机振荡器之间的频率失谐足够大时，才能实现这一点，使得固有的二阶失真可以被频谱隔离并通过接收器的低通滤波来抑制。
We demonstrate analytically a novel scheme to obtain polarization-independent operation in low-cost coherent OOK receivers, suitable for access networks. We move from a well-known phase-diversity receiver, exploiting a 3 × 3 coupler, three photodiodes, and basic analogue processing. If that receiver is modified to inject the local oscillator (or the signal) into two inputs with proper polarization states, we show, by both mathematical derivation and numerical simulations, that the resulting electrical signal can be polarization-independent; this is attained only if the frequency-detuning between the signal carrier and the local oscillator is high enough, so that intrinsic second order distortions can be spectrally isolated and suppressed by the low-pass filtering of the receiver.