Generation and distribution of a wide-band continuously tunable millimeter-wave signal with an optical external modulation technique

A new technique to generate and distribute a wide-band continuously tunable millimeter-wave signal using an optical external modulator and a wavelength-fixed optical notch filter is proposed. The optical intensity modulator is biased to suppress the odd-order optical sidebands. The wavelength-fixed...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-10, Vol.53 (10), p.3090-3097
Main Authors: Guohua Qi, Jianping Yao, Seregelyi, J., Paquet, S., Belisle, C.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Electrooptic modulator
Exact sciences and technology
fiber Bragg grating (FBG)
Fibers
Frequency
Frequency filters
Intensity modulation
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave filters
Microwave generation
microwave photonics
Microwaves
Millimeter wave technology
millimeter-wave generation
Modulation
Modulators
Notch filters
Optical attenuators
Optical communication
Optical filters
optical heterodye
Optical modulation
Sidebands
Signal generators
Tuning
Wideband
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Summary:A new technique to generate and distribute a wide-band continuously tunable millimeter-wave signal using an optical external modulator and a wavelength-fixed optical notch filter is proposed. The optical intensity modulator is biased to suppress the odd-order optical sidebands. The wavelength-fixed optical notch filter is then used to filter out the optical carrier. Two second-order optical sidebands are obtained at the output of the notch filter. A millimeter-wave signal that has four times the frequency of the microwave drive signal is generated by beating the two second-order optical sidebands at a photodetector. Since no tunable optical filter is used, the system is easy to implement. A system using an LiNbO/sub 3/ intensity modulator and a fiber Bragg grating filter is built. A stable and high spectral purity millimeter-wave signal tunable from 32 to 50 GHz is obtained by tuning the microwave drive signal from 8 to 12.5 GHz. The integrity of the generated millimeter-wave signal is maintained after transmission over a 25-km standard single-mode fiber. Theoretical analysis on the harmonic suppression with different modulation depths and filter attenuations is also discussed.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.855123