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Comparison of Traveling Wave External Modulator Microwave Mixers

David POLIFKO, Hiroyo OGAWA

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Summary :

The performance of a traveling wave Mach-Zehnder external optical modulator (EOM) mixer is described and compared with a conventional diode mixer's performance. Additionally, by incorporating external circuitry, the EOM mixer can provide single sideband suppression in addition to the inherent local oscillator suppression. The basic frequency mixing function of the EOM mixer is first described theoretically and then extended to the sideband suppression case. The performance of both configurations is also presented. Achievable electrical isolation between LO (carrier) and RF (upconverted data signal at LOIF) frequencies is greater than 95 dB and total link conversion loss is 37 dB in this demonstration with a laser diode source. Sideband suppression of greater than 43 dB with respect to the desired sideband at the photodetector output is achieved.

Publication
IEICE TRANSACTIONS on Electronics Vol.E76-C No.2 pp.257-263
Publication Date
1993/02/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)
Category
Optical-Microwave Mixers

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