Switchable delays optical fibre transponder with optical generation of doppler shift
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United States of America Patent
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Jun 18, 2013
Grant Date -
Sep 15, 2011
app pub date -
Sep 18, 2008
filing date -
Sep 18, 2008
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Abstract
An optical modulator comprising an input suitable to receive an optical carrier, and two Mach-Zender modulators in parallel, which constitute two different optical paths, the whole circuit constituting a third Mach-Zender modulator, the optical modulator being characterized in that:
- the first Mach-Zender modulator is provided with an electrode suitable to carry two signals, each obtained by the sum of the two tones fR and fD, of equal power but dephased of π/2, and with an electrode for realizing a Single Side Band modulation of the tones fR and fD;the second Mach-Zender modulator is biased by means of a DC electrode;the third Mach-Zender modulator comprising an electrode suitable to realize the reversal of the optical carrier phase of the signals deriving from the first and the second Mach-Zender modulator, so as to suppress the optical carrier and thus obtaining only the tones fR and fD in the optical spectrum.
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