Cascaded optic modulator arrangement

Details Cascaded optic modulator arrangement Cascaded optic modulator arrangement

1991-12-09

1992-12-01

Lee, John D.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

385 2, G02B 612

Patent

active

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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Childs, R. B. et al., "Predistortion Linearization of Directly Modulated DFB Lasers and External Modulators for AM Radio Transmission", Technical Digest, Optical Fiber Communication Conf., Optical Society of America, Wash., D.C., 1990, paper WH-6.
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