Sub-rate sampled, non-integer fractionally spaced Volterra nonlinear equalizer for IM/DD systems.

IF 3.2 2区 物理与天体物理 Q2 OPTICS Optics express Pub Date : 2024-07-15 DOI:10.1364/OE.526012
Jaeyoon Kim, Hoon Kim
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Abstract

As high-speed analog-to-digital converters (ADC) account for a significant portion of the receiver's cost in intensity-modulation (IM)/direct-detection (DD) systems, there have been substantial efforts to employ an ADC operating at a relatively low sampling rate. However, half-symbol-spaced electronic nonlinear equalizers used to compensate for nonlinear waveform distortions commonly operate at 2 samples/symbols, and thus require digital upsampling before the equalization. This implies that the digital signal processing (DSP) at the receiver should also operate at 2 sample/symbol even though the ADC operates at the sub-rate (i.e., < 2 sample/symbol). Hence, we propose and experimentally demonstrate the sub-rate sampled, non-integer fractionally spaced Volterra nonlinear equalizer (VNLE). This equalizer does not require the digital upsampling, and thus makes the entire receiver DSP block operating at the sub-rate, the same as the sampling rate of ADC. We estimate the complexity of the proposed equalizer by the number of multipliers required for its implementation. We also evaluate the performance of the proposed VNLE over a 64-Gb/s 4-ary pulse amplitude modulation link and compare the performance with the conventional VNLE (requiring digital upsampling). The results show that the proposed VNLE incurs a very slight performance degradation compared with the conventional VNLE, but reduces the implementation complexity considerably since it obviates the need for digital upsampling at the receiver.

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用于 IM/DD 系统的子速率采样、非整数分数间隔 Volterra 非线性均衡器。
在强度调制(IM)/直接检测(DD)系统中,高速模数转换器(ADC)占接收器成本的很大一部分,因此人们一直在努力采用采样率相对较低的模数转换器。然而,用于补偿非线性波形失真的半符号间隔电子非线性均衡器通常以 2 采样/符号的速率工作,因此需要在均衡之前进行数字升采样。这意味着接收器的数字信号处理(DSP)也应该以 2 个采样/符号的速率运行,即使 ADC 以子速率运行(即......)、
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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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