Electrical termination circuit for a traveling-wave optoelectronic device
AssigneeJDS Uniphase Corporation
InventorsBrian Higgins, Gregory J. McBrien
Life of this patent
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Abstract
An electrical termination circuit for a traveling wave optoelectronic device is disclosed. The electrical termination circuit is constructed to reflect a portion of a radio-frequency signal back into the optoelectronic device. The reflected signal is out of phase with the applied radio-frequency signal at a frequency of a detrimental spectral feature or a bump in an electro-optical transfer characteristic of the optoelectronic device. The amplitude and the phase of the reflected signal are selected so as to suppress the detrimental spectral feature without a significant reduction in the efficiency of electro-optical or optical-electrical transformation of the optoelectronic device.
Claims17
An electrical termination circuit for a traveling-wave optoelectronic device, comprising a first resistive element and a reactive element,
- wherein the traveling-wave optoelectronic device has a transfer characteristic having a spectral feature at a first frequency of a radio-frequency wave traveling through the optoelectronic device, wherein the spectral feature is caused by acoustic effects in the optoelectronic device;
- and
- wherein the first resistive element and the reactive element have such a resistance and a reactance, which, in use, create a reflected radio-frequency wave having a component in quadrature with the traveling radio-frequency wave at the first frequency, for suppressing the spectral feature caused by the acoustic effects in the optoelectronic device.
An optical device comprising:
- a traveling-wave optoelectronic device having a transfer characteristic having a spectral feature at a first frequency of a radio-frequency wave traveling through the optoelectronic device, wherein the spectral feature is caused by acoustic effects in the optoelectronic device;
- and
- an electrical termination circuit coupled to the traveling-wave optoelectronic device, the electrical termination circuit comprising a first resistive element and a reactive element,
- wherein the first resistive element and the reactive element have such a resistance and a reactance, which, in use, create a reflected radio-frequency wave having a component in quadrature with the traveling radio-frequency wave at the first frequency, for suppressing the spectral feature caused by the acoustic effects in the optoelectronic device.
A method for terminating a traveling-wave optoelectronic device, comprising:
- (a) providing a traveling-wave optoelectronic device having a transfer characteristic having a spectral feature at a first frequency of a radio-frequency wave traveling through the optoelectronic device, wherein the spectral feature is caused by acoustic effects in the optoelectronic device;
- (b) selecting a first resistive element and a reactive element for an electrical termination circuit for the traveling-wave optoelectronic device so as to create, in operation, a reflected wave having a component in quadrature with the traveling wave at the first frequency for suppressing the spectral feature caused by acoustic effects in the optoelectronic device;
- and
- (c) terminating the traveling-wave optoelectronic device with the electrical termination circuit of step (b).
An electrical termination circuit for a traveling wave optoelectronic device having an electro-optical transfer characteristic having a spectral ripple feature at a first frequency of a traveling electromagnetic wave propagating through the optoelectronic device, the electrical termination circuit comprising a resistive element and a reactive element connected in parallel, wherein the resistive element and the reactive element have such a resistance and a reactance that, in operation, the electrical termination circuit creates a reflected electromagnetic wave having a component in quadrature with the traveling electromagnetic wave at the first frequency, whereby in operation, the spectral ripple feature of the electro-optical transfer characteristic is suppressed.
Dependencies are inferred from the claim text.