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Photonic Instantaneous Frequency Measurement System Using Complementary Modulation

Drummond, M. V. ; Marques, C. ; Monteiro, P. ; Nogueira, R.N.

IEEE Photonics Technology Letters Vol. 23, Nº 3, pp. 143 - 145, February, 2011.

ISSN (print): 1041-1135
ISSN (online): 1041-1135

Journal Impact Factor: 2,110 (in 2014)

Digital Object Identifier: 10.1109/LPT.2010.2093875

A novel photonic instantaneous frequency measure- ment system based on complementary modulation is proposed and experimentally demonstrated. A dual-electrode dual-output Mach–Zehnder modulator is used to simultaneously achieve elec- trooptical modulation and complementary modulation sideband (MS) filtering. By suppressing the optical carrier at one of the modulator outputs, complementary MS filtering is mapped into two complementary average optical powers from which the RF frequency is derived. The obtained frequency measurement is independent of both optical and RF powers, and is also robust to electrical circuitry imperfections.