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US 9,806,816 B2Granted
Re-modulation crosstalk and intensity noise cancellation in wavelength-division multiplexing (WDM) passive optical networks (PONs)
AssigneeFuturewei Technologies, Inc.
InventorNing Cheng
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Abstract
An apparatus comprising a signal generator configured to produce a modulation signal, a filter coupled to the signal generator and configured to filter the modulation signal to produce a cancellation signal, and a reflective semiconductor optical amplifier (RSOA) coupled to the signal generator and the filter, wherein the RSOA is configured to generate an optical signal according to a difference between the modulation signal and the cancellation signal and transmit the optical signal towards a partial reflection mirror (PRM).
Claims20
An apparatus comprising:
- a signal generator configured to produce a modulation signal;
- a filter coupled to the signal generator and configured to filter the modulation signal to produce a cancellation signal;
- and
- a reflective semiconductor optical amplifier (RSOA) coupled to the signal generator and the filter, wherein the RSOA is configured to:
- generate an optical signal according to a difference between the modulation signal and the cancellation signal;
- and
- transmit the optical signal towards a partial reflection mirror (PRM),
- wherein the filter comprises a filter response comprising:
- an optical-to-optical response of the RSOA;
- a scaling component associated with a power reflection coefficient of the PRM;
- and
- a delay component associated with a round-trip delay between the RSOA and the PRM.
9 more elements
An apparatus comprising:
- a signal generator configured to produce a modulation signal;
- a filter coupled to the signal generator and configured to filter the modulation signal to produce a cancellation signal;
- a reflective semiconductor optical amplifier (RSOA) coupled to the signal generator and the filter, wherein the RSOA is configured to:
- generate an optical signal according to a difference between the modulation signal and the cancellation signal;
- transmit the optical signal towards a partial reflection mirror (PRM);
- and
- receive a reflected signal comprising at least a first portion of the optical signal reflected from the PRM;
- a photodetector coupled to the RSOA and configured to receive a feedback signal comprising at least a second portion of the optical signal and at least a third portion of the reflected signal;
- and
- a filter adjustment unit coupled to the photodetector and the filter, wherein the filter adjustment unit is configured to adjust the filter according to the feedback signal received from the photodetector.
7 more elements
A method comprising:
- generating, via a signal generator, an electrical modulation signal;
- generating, via a filter, a cancellation signal according to the electrical modulation signal;
- subtracting the cancellation signal from the electrical modulation signal to produce a pre-compensated signal;
- and
- modulating a self-seeded reflective semiconductor optical amplifier (SS-RSOA) according to the pre-compensated signal to produce an optical signal,
- wherein the filter comprises a filter response associated with a round-trip delay between the SS-RSOA and a power reflection coefficient of a partial reflection mirror (PRM).
3 more elements
Dependencies are inferred from the claim text.