Cascaded optic modulator arrangement

Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic

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385 2, G02B 612

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051685345

ABSTRACT:
A pair of interferometers, such as Mach-Zehnders, are disposed in a series arrangement in which a signal fed to an input of the first Mach-Zehnder is modulated by an optic modulator, the modulated signal is fed to an input of the second Mach-Zehnder and is modulated by a second optic modulator, the two optic modulators effectively being connected in a series or cascade arrangement. The phase offset of both modulators and the contrast of one modulator are adjusted to minimize both second and third order harmonics inherently generated by the modulation process of each modulator, thereby providing an improved linear response in the output signal of the second Mach-Zehnder.

REFERENCES:
patent: 5101450 (1992-03-01), Olshansky
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