Balanced optical-radiofrequency phase detector

Details Balanced optical-radiofrequency phase detector Balanced optical-radiofrequency phase detector

2008-07-08

2008-07-08

Chowdhury, Tarifur R (Department: 2886)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S450000, C356S459000

Reexamination Certificate

active

07397567

ABSTRACT:
A balanced optical-RF phase detector for the extraction of low-jitter radiofrequency (RF) signals from optical pulse trains is demonstrated. The extraction of the low-jitter radiofrequency signals is based on the precise phase detection by use of a differentially biased Sagnac-loop interferometer and synchronous detection. The phase-error signal from this balanced optical-RF phase detector, which is robust against drifts and photodetector nonlinearities, is used to regenerate low-jitter radiofrequency signals from optical pulse trains. Alternatively, the phase-error signal is used to generate a low-jitter optical pulse train, synchronized with a master radiofrequency signal or to synchronize multiple modelocked lasers with each other.

REFERENCES:
patent: 2005/0265406 (2005-12-01), Kaertner et al.
Kim et al., “Femtosecond synchronization of radio frequency signals with optical pulse trains”,Optics Lett., 29(17):2076-2078 (2004).
Kim et al., “Balanced optical-microwave phase detectors for optoelectronic phase-locked loops”,Optics Lett., 31(24):3659-3661 (2006).
Kim et al., “A balanced optical-RF phase detector”,Paper CTuP5, Conference on Lasers and Electro Optics(CLEO), Long Beach, CA, May 2006.
International Search Report and Written Opinion of the International Searching Authority for counterpart international application, PCT/US2006/047490, mailed Jun. 11, 2007.
Kim, J., et al., “Large-Scale Timing Distribution and RF-Synchronization for FEL Facilitites,” Aug. 29, 2004, XP002356005 (retrieved from http://www.JACoW.org on Nov. 25, 2005) (cited in the International Search Report for PCT/US2006/047490).
McFerran, J. J., et al., “Low-Noise Synthesis of Microwave Signals from an Optical Source, ” Electronics Letters, IEE Stevenage, GB, vol. 41, No. 11, May 26, 2005, pp. 650-651, XP006024155, ISSN: 0013-5194 (cited in the International Search Report for PCT/US2006/047490).
Kim, J., et al., “Femtosecond Synchronization and Stabilization Techniques,” Proceedings of FEL, Bessy, 2006, pp. 287-290, XP002434020.

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