Attenuator integrated with modulator and transmitting module for WDM systems using the same
AssigneeAvanex Corporation
InventorsAndrea Castoldi, Flavio Dell'orto, Davide Sciancalepore
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Abstract
An optical device integrated on a planar substrate is disclosed, comprising a Y-branch attenuator optically coupled to a Mach-Zehnder modulator. The device also comprises means for reducing a crosstalk caused by unguided radiation between the Y-branch attenuator and the Mach-Zehnder modulator. In one embodiment, the reduction of the crosstalk is obtained by connecting the Mach-Zehnder modulator to one arm of the Y-branch attenuator. The invention also comprises a transmitting module including the integrated device.
Claims21
An integrated optical device comprising:
- a planar substrate, a Mach-Zehnder modulator integrated on said substrate characterized in that it further comprises a Y-branch optical attenuator integrated on said substrate to provide an attenuation range, said Y-branch attenuator being optically coupled to said Mach-Zehnder modulator, and means for reducing a crosstalk between said Y-branch attenuator and said Mach-Zehnder modulator, whereby the extinction ratio of the optical device is at least 18 dB on an attenuation range of at least 6 dB.
An integrated optical device comprising:
- a substrate, a Mach-Zehnder modulator integrated on said substrate characterized in that it further comprises a Y-branch attenuator integrated on said substrate, said Mach-Zehnder modulator being optically coupled to one arm of said Y-branch attenuator.
A method for reducing the crosstalk between at least two devices including optical waveguides integrated on a substrate, each of said optical devices including at least one multimodal section of optical waveguide, said crosstalk being generated by unguided optical radiation propagating on said substrate in a region comprised between said optical devices, said method comprising:
- integrating a Mach-Zehnder modular and a Y-branch attenuator on said substrate thereby defining said region;
- and
- filtering said unguided radiation in said region.
A transmitting module comprising:
- a laser source for emitting an optical signal, an integrated optical device for modulating the intensity of said optical signal, comprising a Mach-Zehnder modulator formed on a substrate, characterized in that said integrated optical device further comprises a Y-branch optical attenuator formed on said substrate optically coupled to said modulator, to provide an attenuation range, and means for reducing a crosstalk between said Y-branch attenuator and said Mach-Zehnder modulator, whereby the extinction ratio of the optical device is at least 18 dB on an attenuation range of at least 6 dB.
A transmitting module comprising:
- a laser source for emitting an optical signal, an integrated optical device for modulating the intensity of said optical signal, comprising a Mach-Zehnder modulator formed on a substrate, characterized in that said integrated optical device further comprises a Y-branch optical attenuator formed on said substrate, and said Mach-Zehnder modulator is optically coupled to one arm of said Y-branch attenuator.
A transmitting module comprising:
- a laser source for emitting an optical signal;
- and
- an integrated optical device for modulating the intensity of the optical signal, comprising:
- a Mach-Zehnder modulator formed on a substrate;
- a Y-branch optical attenuator formed on the substrate, wherein the Mach-Zehnder modulator is optically coupled to a first arm of the Y-branch attenuator and the Y-branch attenuator is located upstream with respect to said Mach-Zehnder modulator;
- a dummy waveguide coupled to a second arm of the Y-branch attenuator;
- and
- a feedback circuit optically connected to the dummy waveguide, the feedback circuit comprising electrical control circuits for controlling the wavelength of the emitted signal.
Dependencies are inferred from the claim text.