Nakamura Kazuki, Channa Hin, Asobe Masaki, Umeki Takeshi, Takenouchi Hirokazu
Opt Express. 2017 Feb 20;25(4):3639-3645. doi: 10.1364/OE.25.003639.
We devised a method for the measurement of the phase-matching curve of multiple quasi-phase-matched (QPM) LiNbO waveguide under conditions of high-power second-harmonic generation. The data obtained revealed that the phase-matching condition can be preserved due to the high damage resistance of the directly bonded LiNbO waveguide. Based on this evaluation, we tried to generate multiple optical carriers using multi-stage frequency mixing in the multiple QPM device. The multiple optical carriers have mutual phase correlation, which is suitable for coherent wavelength division multiplexing (WDM) transmission. We also demonstrated 20 Gb/s quadrature phase shift keying (QPSK) signal generation using multiple optical carriers in order to ensure signal quality.
我们设计了一种方法，用于在高功率二次谐波产生条件下测量多个准相位匹配（QPM）铌酸锂（LiNbO）波导的相位匹配曲线。所获得的数据表明，由于直接键合的LiNbO波导具有高抗损伤性，因此可以保持相位匹配条件。基于此评估，我们尝试在多个QPM器件中使用多级频率混频来生成多个光载波。多个光载波具有相互相位相关性，这适用于相干波分复用（WDM）传输。为了确保信号质量，我们还演示了使用多个光载波生成20 Gb/s正交相移键控（QPSK）信号。
