Optical waveguides – With optical coupler – Particular coupling function
Patent
1996-07-03
1998-08-25
Ngo, John
Optical waveguides
With optical coupler
Particular coupling function
385 14, 385132, 385 43, 385 45, G02B 626
Patent
active
057991197
ABSTRACT:
A Mach Zehnder (MZ) modulator with improved coupling of input and output fibers is provided. The MZ modulator combines the advantages of weakly guided input sections with strongly guided sections to optimize the coupling efficiency and selectivity of the device. Improved coupling between weakly and strongly guided sections of waveguide is provided by an intermediate tapered waveguide section which provides gradually changing mode confinement, which reduces the mode mismatch loss and therefore suppresses the reflection at the junction between the weakly and strongly guided sections of the waveguide.
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Rolland Claude
Yu Jun
de Wilton Angela C.
Ngo John
Northern Telecom Limited
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