Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2011-05-10
2011-05-10
Healy, Brian M (Department: 2883)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C385S002000, C385S001000, C385S005000, C385S014000
Reexamination Certificate
active
07941011
ABSTRACT:
In a multilevel light intensity modulator of the invention, input light is branched into n (n is an integer of 2 or more), and respectively sent to n branching waveguides. On the branching waveguides are respectively provided MZI light modulating sections. The MZI light modulating sections branch the input light into two at a branching ratio different from 0.5:0.5, and respectively output a binary optical signal with a quenching ratio being deteriorated, by on/off driving with a binary electric signal. Then by coupling the light output from the MZI light modulating sections, an optical signal with the light intensity modulated to a 2nvalue not including the zero level is output. As a result quaternary or higher level light intensity modulation which does not include the zero level, can be realized by a practical configuration using a binary electric signal.
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Fujitsu Limited
Healy Brian M
Staas & Halsey , LLP
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