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首页> 外文会议>International Conference on Optics and Photonics 2015 >Analysis of OSNR Requirements for Higher Modulation Schemes for Various Local Oscillator Powers
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Analysis of OSNR Requirements for Higher Modulation Schemes for Various Local Oscillator Powers

机译：分析各种本地振荡器功率的更高调制方案的OSNR要求

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To meet the growing demands of data traffic in long haul communication, it is necessary to efficiently use the low-loss region(C-band) of the optical spectrum, by increasing the no. of optical channels and increasing the bit rate on each channel .But narrow pulses occupy higher spectral bandwidth. To circumvent this problem, higher order modulation schemes such as QPSK and QAM can be used to modulate the bits, which increases the spectral efficiency without demanding any extra spectral bandwidth. On the receiver side, to meet a satisfy, a given BER, the received optical signal requires to have minimum OSNR. In our study in this paper, we analyses for different modulation schemes, the OSNR required with and without preamplifier. The theoretical limit of OSNR requirement for a modulation scheme is compared for a given link length by varying the local oscillator (LO) power. Our analysis shows that as we increase the local oscillator (LO) power, the OSNR requirement decreases for a given BER. Also a combination of preamplifier and local oscillator (LO) gives the OSNR closest to theoretical limit.
机译：为了满足长距离通信中不断增长的数据流量需求，有必要通过增加no来有效地使用光谱的低损耗区域（C波段）。光信道的数目增加了每个信道的比特率。但是窄脉冲占据了更高的频谱带宽。为了解决这个问题，可以使用更高阶的调制方案（例如QPSK和QAM）来调制比特，这可以提高频谱效率，而无需任何额外的频谱带宽。在接收器端，为了满足给定的BER，接收到的光信号必须具有最小的OSNR。在本文的研究中，我们针对不同的调制方案，分析了有无前置放大器时所需的OSNR。对于给定的链路长度，通过改变本地振荡器（LO）功率，比较了调制方案的OSNR要求的理论极限。我们的分析表明，随着我们增加本地振荡器（LO）功率，对于给定的BER，OSNR要求降低。前置放大器和本地振荡器（LO）的组合也使OSNR最接近理论极限。

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