Butler Sharon M, Singaravelu Praveen K J, O'Faolain Liam, Hegarty Stephen P
Opt Express. 2020 Dec 21;28(26):38813-38821. doi: 10.1364/OE.410525.
A novel configuration of a Fourier domain mode locked (FDML) laser based on silicon photonics platform is presented in this work that exploits the narrowband reflection spectrum of a photonic crystal (PhC) cavity resonator. Configured as a linear Fabry-Perot laser, forward biasing of a p-n junction on the PhC cavity allowed for thermal tuning of the spectrum. The modulation frequency applied to the reflector equalled the inverse roundtrip time of the long cavity resulting in stable FDML operation over the swept wavelength range. An interferometric phase measurement measured the sweeping instantaneous frequency of the laser. The silicon photonics platform has potential for very compact implementation, and the electro-optic modulation method opens the possibility of modulation speeds far beyond those of mechanical filters.
本文介绍了一种基于硅光子平台的新型傅里叶域锁模（FDML）激光器配置，该配置利用了光子晶体（PhC）腔谐振器的窄带反射光谱。配置为线性法布里-珀罗激光器时，PhC腔上p-n结的正向偏置允许对光谱进行热调谐。施加到反射器的调制频率等于长腔的往返时间倒数，从而在扫描波长范围内实现稳定的FDML操作。干涉相位测量法测量了激光器的扫描瞬时频率。硅光子平台具有非常紧凑的实现潜力，并且电光调制方法开启了调制速度远超机械滤波器的可能性。
