Dual-mode receiver integrated with dispersion compensator
OwnerXingyu Zhang, Tongqing Wanginventors
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Abstract
An integrated receiver chip comprising: a first end and a second end; at least one optical input port disposed at the first end; a polarization manipulation device optically connected to one of the at least one optical input port, the polarization manipulation device being adapted to split an optical signal into a first and a second optical signals; a first and a second dispersion compensators each optically connected to the polarization manipulation device, the first and the second dispersion compensators each being adapted to selectively induce a dispersion on an optical signal propagating through the dispersion compensator; and a first and a second photodetectors optically connected to the first and the second dispersion compensators, respectively.
Claims20
An integrated receiver chip comprising:
- a first end and a second end;
- at least one optical input port disposed at the first end;
- a polarization manipulation device optically connected to one of the at least one optical input port, the polarization manipulation device being adapted to split an optical signal into a first and a second optical signals;
- a first and a second dispersion compensators each optically connected to the polarization manipulation device, the first and the second dispersion compensators each being adapted to selectively induce a dispersion on an optical signal propagating through the dispersion compensator;
- and
- a first and a second single polarization waveguide photodetectors optically connected to the first and the second dispersion compensators, respectively, the first and the second single polarization waveguide photodetectors each being electrically connected in parallel and adapted to convert optical signals into electrical currents, such that corresponding electrical currents from the first and the second single polarization waveguide photodetectors are configured to be combined;
- wherein the integrated receiver chip is configured for direct detection.
An optical to electrical (OE) conversion system comprising an integrated receiver chip, a transimpedance amplifier, and a digital signal processor (DSP), the transimpedance amplifier and the digital signal processor each being in electrical communication with the integrated receiver chip, the integrated receiver chip comprising:
- at least one optical input port disposed at a first end of the integrated receiver chip;
- a polarization splitter disposed after the at least one optical input port;
- a first and a second dispersion compensators each optically connected to one of the at least one optical input port, the first and the second dispersion compensators each being adapted to selectively induce a dispersion on an optical signal propagating through the dispersion compensator;
- and
- a first and a second single polarization waveguide photodetectors optically connected to the first and the second dispersion compensators, respectively, the first and second single polarization waveguide photodetectors being electrically connected in parallel;
- wherein, when an optical signal is launched into the integrated receiver chip at one of the at least one optical input port, the first and the second dispersion compensators induce a selected dispersion on the optical signal, the optical signal being absorbed by each of the first and the second single polarization waveguide photodetectors to generate corresponding photocurrents, such that the photocurrents from the first and the second single polarization waveguide photodetectors are configured to be combined into a combined photocurrent that is transmitted to the transimpedance amplifier, the transimpedance amplifier being configured to convert the combined photocurrent to a voltage signal;
- and
- wherein the DSP is configured to monitor inducing of the dispersion on the optical signal by digitally processing a bit error rate of the voltage signal being outputted from the transimpedance amplifier, the DSP being further configured to transmit a control signal to each of the first and the second dispersion compensators for selectively adjusting a value of the induced dispersion and the integrated receiver chip is configured for direct detection.
A method of enabling dispersion compensation on an integrated receiver chip configured for direct detection, the integrated receiver chip having a first and a second single polarization waveguide photodetectors, the method comprising steps of integrating a first and a second dispersion compensators on the integrated receiver chip, the first and the second dispersion compensators being optically connected to the first and the second single polarization waveguide photodetectors, respectively, the first and second single polarization waveguide photodetectors being electrically connected in parallel, such that photocurrents electrically transmitted from the first and the second single polarization waveguide photodetectors are combined, and providing a digital signal processor (DSP) in electrical communication with the first and the second dispersion compensators, the DSP being programmed to:
- set initial dispersion compensator parameters;
- enter scan operation mode;
- scan through preset dispersion compensator parameters;
- set the parameters for the best BER;
- end scan operation mode;
- enter tracking operation mode;
- tune dispersion compensator parameters;
- and
- find optimum BER.
Dependencies are inferred from the claim text.