We propose and experimentally demonstrate digitally programmable optical frequency combs (OFCs), featured by binary phase distribution and flat power envelope among comb lines for the first time. In the proposed simple generation scheme, a programmable optimized binary sequence is generated and applied to phase modulate a CW lightwave, creating an OFC with joint manipulation of both binary phase distribution and flat power envelope. Moreover, by digitally programing of the binary sequence, the generated OFC shows high tunability on comb spacing and comb-line number. In the experiments, tunable comb spacing of 20, 10, 5, 2 MHz and tunable comb-line number of 21, 51, 101 are demonstrated, while retaining excellent binary phase and flat power envelope. Such an agile joint manipulation of both phase and power paves a new way for promising phase-correlated applications of OFCs, such as the covert communications and weak signal detection.

中文翻译：

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具有二元相位分布和平坦包络的数字可编程光学频率梳


我们首次提出并实验演示了数字可编程光学频率梳（OFC），其特征是梳状线之间的二进制相位分布和平坦功率包络。在所提出的简单生成方案中，生成可编程优化的二进制序列并应用于对 CW 光波进行相位调制，从而创建具有二进制相位分布和平功率包络联合操作的 OFC。此外，通过对二进制序列进行数字编程，生成的OFC在梳间距和梳线数上表现出高度可调性。在实验中，展示了20、10、5、2 MHz的可调梳齿间距和21、51、101的可调梳齿线数量，同时保留了出色的二进制相位和平坦的功率包络。这种对相位和功率的灵活联合操纵为 OFC 的有前途的相位相关应用（例如隐蔽通信和弱信号检测）铺平了新的道路。