Real-Time Generation of NHS-OFDM Signal for Direct-Modulation and Direct-Detection PON
Real-Time Generation of NHS-OFDM Signal for Direct-Modulation and Direct-Detection PON
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实时生成用于直接调制和直接检测 PON 的 NHS-OFDM 信号
DOI：
10.1109/lpt.2021.3073971
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发表时间：
2021-06
影响因子：
2.6
通讯作者：
Chen Qinghui
中科院分区：
文献类型：
--
作者：
Chen Ming;Chen Gang;Chen Wen;Yin Lede;Zuo Jianing;Cheng Qianjiao;Qian Shengyou;Zhou Hui;Chen Qinghui
基于正交频分复用的无源光网络通过分配子载波和时隙，可以提供高频谱效率和灵活的二维带宽分配。与相干检测相比，具有厄米对称性约束的直接调制直接检测(DM-DD)OFDM具有硬件实现简单、成本低、功耗低等优点，更适合于成本敏感的无源光网络。在这样的厄米对称光ofdm(HS-ofdm)中，只有一半的SC可以用于携带用户数据，因此从硬件实现的观点来看，反快速傅立叶变换(IFFT)和FFT大小是低效的。在这项工作中，我们使用一个单现场可编程门阵列和数模转换器来实现一个没有数模上转换的无HS的正交频分复用(NHS-OFDM)发射机。在相同的带宽粒度和数据传输速率下，比较了HS-ofdm和NHS-ofdm实时发射机的片上资源开销和功耗。寄存器、查找表和乘法器分别节省高达45%、49.5%和58.7%。此外，片上功耗也降低了15%。此外，在短距离DM-DD传输系统中对这两种实时发射机进行了实验研究。在20/50/70公里标准单模光纤传输后，可以获得类似的误码率性能。
Orthogonal frequency-division multiplexing-based passive optical networks (OFDM-PON) can provide high spectral efficiency and flexible two-dimensional bandwidth allocation by assigning subcarriers (SCs) and time slots. The direct-modulation and direct-detection (DM-DD) OFDM with Hermitian symmetry constraint has simple hardware implementation, low cost, and low power consumption compared to coherent detection and is more suitable for cost-sensitive PON. In such a Hermitian symmetric optical OFDM (HS-OFDM), only half of the SCs can be used to carry user data, and thus inverse fast Fourier transform (IFFT) and FFT sizes are inefficient in the viewpoint of hardware implementation. In this work, we use a single field programmable gate array and digital-to-analog converter to implement an HS-free OFDM (NHS-OFDM) transmitter without digital/analog up-conversion. We compare the on-chip resource overhead and power consumption between real-time HS-OFDM and NHS-OFDM transmitters under the same bandwidth granularity and data transmission rate. The registers, look-up tables and multipliers are saved up to 45%, 49.5% and 58.7%, respectively. Besides, the on-chip power consumption is also reduced by 15%. Moreover, the two real-time transmitters are experimentally investigated in a short-reach DM-DD transmission system. A similar bit error rate performance can be achieved after 20/50/70 km standard single-mode fiber transmission.
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影响因子：
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作者：
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DOI：
10.1109/ofc.2008.4528704
发表时间：
2008-05
期刊：
OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference
影响因子：
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