Hybrid Integrated Optical Phase-Lock Loops for Photonic Terahertz Sources

Autor:	Cyril C. Renaud, Martyn J. Fice, Ian Francis Lealman, Luka Naglic, L. Pavlovic, Matjaz Vidmar, Lalitha Ponnampalam, David G. Moodie, Michael J. Robertson, Alwyn J. Seeds, Robert Steed, D. C. Rogers, Graeme Maxwell
Rok vydání:	2011
Předmět:	Materials science business.industry Laser Atomic and Molecular Physics and Optics Photodiode law.invention Laser linewidth Optics law Phase noise Optoelectronics Electrical and Electronic Engineering Photonics business Optical filter Comb filter Spectral purity
Zdroj:	IEEE Journal of Selected Topics in Quantum Electronics. 17:210-217
ISSN:	1558-4542 1077-260X
DOI:	10.1109/jstqe.2010.2049003
Popis:	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
Databáze:	OpenAIRE
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