NDLI: Optical down-sampling of wide-band microwave signals

Content Provider	IEEE Xplore Digital Library
Author	Juodawlkis, P.W. Hargreaves, J.J. Younger, R.D. Titi, G.W. Twichell, J.C.
Copyright Year	1983
Abstract	Phase-encoded optical sampling allows radio-frequency and microwave signals to be directly down-converted and digitized with high linearity and greater than 60-dB (10-effective-bit) signal-to-noise ratio. Wide-band electrical signals can be processed using relatively low optical sampling rates provided that the instantaneous signal bandwidth is less than the Nyquist sampling bandwidth. We demonstrate the capabilities of this technique by using a 60-MS/s system to down-sample two different FM chirp signals: 1) a baseband (0-250 MHz) linear-chirp waveform and 2) a nonlinear-chirp waveform having a 10-GHz center frequency and a frequency excursion of 1 GHz. We characterize the frequency response of the technique and quantify the analog bandwidth limitation due to the optical pulse width. The 3-dB bandwidth imposed by a 30-ps sampling pulse is shown to be 10.4 GHz. We also investigate the impact of the pulse width on the linearity of the phase-encoded optical sampling technique when it is used to sample high-frequency signals.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	3116
Ending Page	3124
Page Count	9
File Size	694126
File Format	PDF
ISSN	07338724
Volume Number	21
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wideband Bandwidth Signal sampling Optical pulses Linearity Signal processing Sampling methods Radio frequency Signal to noise ratio Chirp
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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