Hybrid Integrated Optical Phase-Lock Loops for Photonic Terahertz Sources
Hybrid Integrated Optical Phase-Lock Loops for Photonic Terahertz Sources
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DOI：
10.1109/jstqe.2010.2049003
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发表时间：
2011
影响因子：
4.9
通讯作者：
R. Steed;L. Ponnampalam;M. Fice;C. Renaud;D. Rogers;D. Moodie;G. Maxwell;I. Lealman;M. Robertson;L. Pavlovič;L. Naglič;M. Vidmar;A. Seeds
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文献类型：
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作者：
R. Steed;L. Ponnampalam;M. Fice;C. Renaud;D. Rogers;D. Moodie;G. Maxwell;I. Lealman;M. Robertson;L. Pavlovič;L. Naglič;M. Vidmar;A. Seeds
我们提出了第一个用于高光谱纯度光子太赫兹源的混合集成光学锁相环(OPLL)。通过将从激光器和光电探测器混合集成在带有硅光波导的硅底板上，并结合定制的低延迟电子环路滤波电路，我们实现了锁定1 MHz线宽从激光器所需的短环路延迟。激光和光电探测器是基于InP的，倒装芯片结合到硅子板上，硅子板又连接到主板上。从激光器和光电二极管之间的延迟约为50ps。从信号源和主信号源之间的外差具有小于1 kHz的线宽，在10 kHz的偏移量下实现了小于-80dBc/Hz的相位噪声。使用微波振荡器，从激光器可以偏离主光源2-7 GHz。这种集成OPLL电路与光学梳状源和注入锁定激光梳状滤光器一起使用，可以产生线宽为1 kHz、功率约为-20 dBm、频率高达300 GHz的高光谱纯度信号，而这两个集成激光器可以在高达1.8 THz的频率下提供可调的外差信号。
We present the first hybrid-integrated optical phase-lock loop (OPLL) for use in high spectral purity photonic terahertz sources. We have achieved the necessary short loop delay to lock a 1-MHz linewidth slave laser by hybrid integration of the slave laser and photodetector on a silicon motherboard with silica optical waveguides and combining this with a custom-designed low-delay electronic loop filter circuit. The laser and photodetectors are InP-based and are flip chip bonded to silicon daughter boards, which are in turn attached to the motherboard. Delay between the slave laser and photodiode was approximately 50 ps. The heterodyne between slave and master sources has a linewidth of less than 1 kHz and achieved phase noise less than -80 dBc/Hz at an offset of 10 kHz. The slave laser can be offset from the master source by 2-7 GHz, using a microwave oscillator. This integrated OPLL circuit was used with an optical comb source and an injection-locked laser comb filter to generate high spectral purity signals at frequencies up to 300 GHz with linewidths <;1 kHz and powers of about -20 dBm, while the two integrated lasers could deliver a tunable heterodyne signal at frequencies up to 1.8 THz.