Hybrid Integrated Optical Phase-Lock Loops for Photonic Terahertz Sources

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...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2011-01, Vol.17 (1), p.210-217
Main Authors: Steed, Robert J, Ponnampalam, Lalitha, Fice, Martyn J, Renaud, Cyril C, Rogers, David C, Moodie, David G, Maxwell, Graeme D, Lealman, Ian F, Robertson, Michael J, Pavlovic, Leon, Naglic, Luka, Vidmar, Matjaz, Seeds, Alwyn J
Format: Article
Language:English
Subjects:
Circuits
Delay
Hybrid integrated circuits
Integrated optics
Laser noise
Lasers
Masers
millimeter (mm)-wave generation
Motherboards
Offsets
Optical filters
optical heterodyne
Optical mixing
optical phase-lock loops (OPLLs)
Optical waveguides
Photodetectors
Photonics
Purity
Silicon
terahertz (THz)
Waveguide lasers
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Summary: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
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2010.2049003