G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/225 (2006.01) G02F 1/017 (2006.01)
Patent
CA 2176099
A MQW semiconductor Mach Zehnder phase modulator is formed by two Y-junctions (12, 32), each having a single waveguide (14) optically coupled with two branch waveguides (18, 20). The branch waveguides of the two Y-juntions are optically coupled in Mach-Zehnder configuration that, under zero bias conditions, has one interferometric arm longer than the other to provide a .pi. phase shift. The additional length is preferably accommodated in the branches of the Y-junctions. The phase shift, in combination with voltage dependent absorption properties and non-linear phase variations of the MQW guided regions in the Mach-Zehnder modulator results in a negative chirp and high extinction ratio for an equal, push-pull device configuration.
Gibbon Mark Acton
Rolland Claude
Thompson George Horace Brook
Yevick David Owen
Yu Jun
Bookham Technology Plc
Mbm Intellectual Property Law Llp
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