Optical Sinc-Shaped Nyquist Pulses Generation From Frequency-Quadrupled Rectangular Frequency Comb

被引：3
作者：
Chen, Hongyao [1 ]
Ning, Tigang [1 ]
Li, Jing [1 ]
Pei, Li [1 ]
Zheng, Jingjing [1 ]
Liu, Ling [1 ]
Yuan, Jin [1 ]
机构：
[1] Beijing Jiaotong Univ, Inst Lightwave Technol, Key Lab All Opt Network & Adv Telecommun Network, Beijing 100044, Peoples R China
来源：
IEEE PHOTONICS JOURNAL | 2017年 / 9卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Fiber optics and optical communications; modulation; pulses; TDM TRANSMISSION;
D O I：
10.1109/JPHOT.2017.2761814
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Frequency-quadrupled rectangular optical frequency comb (OFC) generation with Nyquist temporal waveforms using a dual-parallel Mach-Zehnder modulator (DP-MZM) and a remodulation structure is proposed. The remodulation structure is formed by a coupler, a photodiode, and an intensity modulator. Its function is similar to optical carrier suppression (OCS) modulation index amplifier, which can achieve the modulation index improve of approximately 77.9% in the OCS modulation. This result in no special modulation index is needed in the proposed scheme. By using a 4 GHz sinusoid signal, a 4-tones frequency-quadrupled OFC with sideband spacing of 16 GHz and flatness within 0.5 dB is experimentally generated. The temporal waveform is sinc-shaped Nyquist pulse with duty cycle 23% and the repetition rate is quadrupling that of the local oscillator frequency, which shows great potential in generating a cost-effective pulses. Moreover, being benefited from the filter-free structure, the high flexibility of the generated Nyquist pulse has also been demonstrated.
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页数：7
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