Huang Huan, Wang Ruofan, Zhang Chongfu, Chen Yong, Yang Haifeng, Qiu Kun
Opt Lett. 2020 Feb 15;45(4):848-851. doi: 10.1364/OL.385458.
In this Letter, based on two advanced tunable ultra-flat optical frequency comb generators (T-FOCGs), a coherent channelized receiver with high channelized efficiency and reconfigurability is proposed. In the T-FOCG, the number of 1 dB comb lines increases with the gain, but the optical power of these 1 dB comb lines has almost the constant variance. In the proposed scheme, one optical carrier can support four sub-channels. Meanwhile, the number and bandwidth of sub-channels, as well as the bandwidth and center frequency of an original broadband signal, are all tunable. In this Letter, we verify the feasibility of the coherent channelized receiver by channelizing a 4 GHz signal with a 20 GHz center frequency into four 1 GHz sub-channels, and the reconfigurability is demonstrated by channelizing a 10 GHz signal with frequencies from 18 to 28 GHz into five 2 GHz sub-channels. Moreover, the error-vector magnitude curves of the directly received and the channelized quadrature amplitude modulation (QAM) signal at different amounts of beat noise are compared.
在本信函中，基于两个先进的可调谐超平坦光学频率梳发生器（T - FOCG），提出了一种具有高信道化效率和可重构性的相干信道化接收机。在T - FOCG中，1 dB梳状线的数量随增益增加，但这些1 dB梳状线的光功率具有几乎恒定的方差。在所提出的方案中，一个光载波可支持四个子信道。同时，子信道的数量和带宽以及原始宽带信号的带宽和中心频率均是可调的。在本信函中，我们通过将中心频率为20 GHz的4 GHz信号信道化为四个1 GHz子信道来验证相干信道化接收机的可行性，并通过将频率范围为18至28 GHz的10 GHz信号信道化为五个2 GHz子信道来证明其可重构性。此外，还比较了在不同拍频噪声量下直接接收和信道化的正交幅度调制（QAM）信号的误差矢量幅度曲线。
